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3250 AND 3251
PRELIMINARY INFORMATION
(subject to change without notice) October 15, 2002
PROGRAMMABLE, CHOPPERSTABILIZED, HALL-EFFECT SWITCHES
The A3250 and A3251 are programmable Hall-effect switches for high-temperature applications. Each sensor consists of a single element, chopper-stabilized Hall-effect IC that can be programmed to the desired magnetic operate switch point (drastically reducing the effects of variations found in a production environment), while the hysteresis remains fixed. The small packages can be easily assembled and used in conjunction with a wide variety of target shapes and sizes. The A3250 output turns on in the presence of the programmed south-pole magnetic field while the A3251 turns off with the programmed south-pole magnetic field.
Data Sheet 27621.41
X
PTCT
V
CC
1
2
3
The first character of the part number suffix indicates the device operating temperature range. Suffix `E-' is for the automotive and industrial temperature range of -40C to +85C. Suffix `L-' is for the automotive and military temperature range of -40C to +150C. The second and third characters indicate the package. Suffix `-LT' is a miniature SOT89/TO-243AA transistor package for surface-mount applications; suffix `-UA' is a three-lead ultra-mini-SIP for throughhole mounting.
GROUND
Dwg. PH-003-2
OUTPUT
SUPPLY
FEATURES AND BENEFITS ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC ........................ 26.5 V* Reverse Supply Voltage, VRCC ............ -18 V Overvoltage Supply Current, ICC ..... 100 mA Output Off Voltage, VOUT ................... 26.5 V Continuous Output Current, IOUT ..... 20 mA Magnetic Flux Density, B ............ Unlimited Package Power Dissipation, PD ... See Graph Operating Temperature Range, TA Suffix `E-' .................... -40C to +85C Suffix `L-' .................. -40C to +150C Junction Temperature, TJ .................. +165C Storage Temperature Range, TS ................................ -65C to +170C * Fault conditions that produce supply voltage transients will be clamped by an internal Zener diode. These conditions can be tolerated but should be avoided. Internal current limiting is intended to protect the device from output transient short circuits.
s Chopper Stabilized for Extremely Low Switch-Point Drift and Immunity to Mechanical Stress s Externally Programmed Switch Point s On-Chip Supply-Transient Protection s Output Short-Circuit Protection s Reverse Battery Protection s Wide Operating Voltage Range s Defined Power-On State
Always order by complete part number: the prefix 'A' + the basic four-digit part number + a suffix to indicate operating temperature range + a suffix to indicate package style, e.g., A3250LUA .
3250 AND 3251 PROGRAMMABLE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES
FUNCTIONAL BLOCK DIAGRAM
1
SUPPLY
REG. PROGRAM LOGIC OFFSET ADJUST
DYNAMIC OFFSET CANCELLATION
POWER-UP OUTPUT
SAMPLE & HOLD
X
LOW-PASS FILTER
3 CONTROL
CURRENT LIMIT <1 GROUND 2
Dwg. FH-020-3
800
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
700 Suffix "-UA" RJA = 165C/W 600 Suffix "-LT" RJA = 180C/W
500
400
300
200 Suffix "E-" 100 Suffix "L-" 0 20 40 60 100 80 120 AMBIENT TEMPERATURE in C 140 160 180
Dwg. GH-046-7
2
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2002 Allegro MicroSystems, Inc.
3250 AND 3251 PROGRAMMABLE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES
ELECTRICAL CHARACTERISTICS over operating voltage and junction temperature range (unless otherwise noted).
Limits Characteristic Supply Voltage Power-On State Symbol VCC POS Test Conditions Operating After programming, VCC = 0 5 V, t > ton: A3250, B < BOP A3251, B < BOP Output on, IOUT = 20 mA Pulse test, output on (note 1) Output off, VOUT = 24 V Output off (High) Output on (Low) Reverse Supply Current Power-On Delay Output Rise Time Output Fall Time Clock Frequency Zener Voltage Zener Resistance IRCC ton tr tf fC VZ RZ IZT = 100 A IZT = 10 mA VRCC = -18 V Output off RL = 820 , CL = 10 pF RL = 820 , CL = 10 pF Min. 4.2 HIGH LOW - 35 - - - - - - - - 27 - Typ. - HIGH LOW 175 70 - 4.0 6.0 - 20 1.55 1.95 340 32 50 Max. 24 HIGH LOW 400 100 10 7.0 10 -5.0 50 4.0 4.0 - 37 - Units V - - mV mA A mA mA mA s s s kHz V
Low Output Voltage Output Current Limit Output Leakage Current Supply Current
VOUT(SAT) IOUTM IOFF ICC
MAGNETIC CHARACTERISTICS over operating supply voltage and junction temperature range (unless otherwise noted).
Limits Characteristic Operate Point (A3250 output turns on) (A3251 output turns off) BOP Hysteresis Bhys Symbol BOP Test Conditions Initial (before programming) Resolution Maximum programmable Reference BOP at +25C, BOP 350 G BOP - BRP Min. - - 350 - 5.0 Typ. 5.0 7.0 - 5.0 18 Max. 50 - - 35 35 Units G G G G G
NOTES: 1. Do not exceed absolute maximum allowable junction temperature. 2. Typical data is at VCC = 12 V and TA = +25C and is for design information only. 3. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
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3
3250 AND 3251 PROGRAMMABLE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES
TYPICAL ELECTRICAL CHARACTERISTICS
8.0 VCC = 26.5 V
6.0 VCC = 26.5 V
7.0
5.0
SUPPLY CURRENT IN mA
VCC = 12 V 6.0
SUPPLY CURRENT IN mA
VCC = 12 V 4.0
VCC = 4.2 V 5.0
VCC = 4.2 V 3.0
OUTPUT ON 4.0 -50 -25 0 25 50 75 100 125 150
OUTPUT OFF 2.0 -50 -25 0 25 50 75 100 125 150
AMBIENT TEMPERATURE IN C
Dwg. GH-053-3
AMBIENT TEMPERATURE IN C
Dwg. GH-053-4
300
I OUT = 20 mA VCC = 26.5 V
SATURATION VOLTAGE IN mV
200
100
0 -50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN C
Dwg. GH-040-5
4
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3250 AND 3251 PROGRAMMABLE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES
TYPICAL MAGNETIC CHARACTERISTICS
140 VCC = 12 V 120 ADDRESS 16
120
100
ADDRESS 16
OPERATE POINT IN GAUSS
RELEASE POINT IN GAUSS
100
80
VCC = 12 V
80
60
60 ADDRESS 8 40
40
ADDRESS 8
20
20 ADDRESS 1 0 -50 -25 0 25 50 75 100 125 150
0 ADDRESS 1 -20 -50 -25 0 25 50 75 100 125 150
AMBIENT TEMPERATURE IN C
Dwg. GH-044-2
AMBIENT TEMPERATURE IN C
Dwg. GH-044-3
35
30
HYSTERESIS IN GAUSS
25
VCC = 12 V
20
15 ADDRESSES 1, 8, & 16 10
5
0 -50 -25 0 25 50 75 100 125 150
AMBIENT TEMPERATURE IN C
Dwg. GH-044-4
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3250 AND 3251 PROGRAMMABLE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES
FUNCTIONAL DESCRIPTION
The basic Hall sensor is a small sheet of semiconductor material in which a constant current will flow when a regulated voltage is applied. The output will take the form of a voltage measured across the width of the sheet and will have negligible value in the absence of a magnetic field. When a magnetic field with flux lines at right angles to the current flow is applied, a small voltage directly proportional to the strength of the magnetic field and the current will occur at the output terminals. The small signal voltage is proportionally small relative to the offset produced by the semiconductor chip. This makes it very difficult to process the signal and maintain an accurate, reliable output over the operating temperature range. Chopper-Stabilized Technique. These devices use a proprietary dynamic offset cancellation technique, with an internal high-frequency clock to reduce the residual offset voltage of the Hall element that is normally caused by device overmolding, temperature dependencies, and thermal stress. This technique produces devices that have an extremely stable quiescent Hall output voltage, are immune to thermal stress, and have precise recoverability after temperature cycling. This technique will also slightly degrade the device output repeatability. The Hall element can be considered as a resistor array similar to a Wheatstone bridge. A large portion of the offset is a result of the mismatching of these resistors. The chopper-stabilizing technique cancels the mismatching of the resistors by changing the direction of the current flowing through the Hall plate and Hall voltage measurement taps, while maintaining the Hall-voltage signal that is induced by the external magnetic flux. The signal is, then, captured by a sample-and-hold circuit. Operation. The output of the A3250 switches low (turns on) when a magnetic field (south pole) perpendicular to the Hall sensor exceeds the operate point threshold (BOP). After turn-on, the output is capable of sinking 20 mA and the output voltage is VOUT(SAT). The A3250 operate point is programmable (see next section). When the magnetic field is reduced below the release point (BRP), the device output goes high (turns off).
OUTPUT VOLTAGE
B +V
--
HALL VOLTAGE
+
Dwg. AH-011-2
REG
X
A3250 Output characteristic
+V
VCC
B RP
B OP
VOUT(SAT)
0 0 FLUX DENSITY +B
Dwg. GH-007-2
6
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
SAMPLE & HOLD
Dwg. EH-012
3250 AND 3251 PROGRAMMABLE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES
FUNCTIONAL DESCRIPTION (cont'd)
The output of the A3251 switches high (turns off) when a magnetic field (south pole) perpendicular to the Hall sensor exceeds the operate point threshold (BOP). The A3251 operate point is programmable (see next section). When the magnetic field is reduced below the release point (BRP), the device output goes low (turns on). After turnon, the output is capable of sinking 20 mA and the output voltage is VOUT(SAT). The difference in the magnetic operate and release points is the hysteresis (Bhys) of the device. The hysteresis of both devices is identical and independent of the programmed operate point. This built-in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electrical noise. Output Overloads. Current through the output transistor is sensed with a low-value on-chip aluminum resistor. The voltage drop across this resistor is fed back to control the base drive of the output stage. This feedback prevents the output transistor from exceeding its maximum current density rating by limiting the output current. Under shortcircuit conditions, the device will dissipate an increased amount of power (PD = VOUT x IOUTM) and the output transistor will be thermally stressed.
A3251 Output characteristic
+V
V CC
OUTPUT VOLTAGE
B RP
B OP
VOUT(SAT)
0 0 FLUX DENSITY +B
Dwg. GH-007-5
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3250 AND 3251 PROGRAMMABLE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES
PROGRAMMING PROTOCOL
The A3250 and A3251 operate points are programmed by serially addressing the device through the supply terminal (1). After the correct operate point is determined (see application note Programming A Back-Biased Switch For Proximity Sensing), the device programming bits are selected and blown, then a "lock" bit is selected and blown to prevent any further (accidental) programming. Programming voltages (VPL, VPH, and VPP) are applied to terminal 1 of the device. A minimum capacitance of 0.1 F must be connected between terminal 1 and ground to provide the necessary peak current to blow the internal fuse. Program Enable. To program the device, a sequence of pulses (as shown in figure 1) is used to activate/enable the programming mode. This sequence of a VPP pulse, at least seven VPH pulses, and a VPP pulse with no supply interruptions, is designed to prevent the device from being programmed accidentally (for example, as a result of noise on the supply line).
VPP
PROGRAM ENABLE (AT LEAST 7 PULSES)
VPH VPL td(1) 0
Dwg. WH-013
td(1)
td(0)
Figure 1 -- Program enable
PROGRAMMING PROTOCOL over operating temperature range.
Limits Characteristic Programming Voltage Symbol VPL VPH VPP Programming Current Pulse Width IPP td(0) td(1) tdP Pulse Rise Time Pulse Fall Time tr tf Description Low voltage during programming High voltage during programming Programming enable & bit-blow voltage Max. supply current during programming Off time between bits Enable, address, program, or lock bit on time Program pulse on time VPL to VPH or VPP VPH or VPP to VPL Min. 4.5 8.5 25 - 20 20 100 - - Typ. 5.0 - - 500 - - 300 - - Max. 5.5 15 27 - - - - 11 5.0 Units V V V mA s s s s s
NOTE: Typical data is at TA = +25C and is for design information only.
8
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3250 AND 3251 PROGRAMMABLE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES
PROGRAMMING PROTOCOL (cont'd)
ADDRESS N-2 ADDRESS N-1
td(0)
BIT 1 PROGRAM (CODE 000001) ADDRESS 1
Dwg. WH-015A
ADDRESS 1
ADDRESS 2
Addressing. The magnetic operate point is adjustable in 63 increments (64 addresses including the unprogrammed address 0). With the appropriate target* in position, up to 63 switch points are sequentially selected (figure 2) until the required operate point is reached. Note that the difference between the operate point and the release point (hysteresis) is a constant for all addresses. Code Programming. After the desired switch-point address is determined (0 through 63), each bit of the equivalent 6-bit binary code is programmed individually (not at the same time). For example, as illustrated in figure 3, to program switch-point address 5 (binary code 000101), bits 3 and 1 need to be programmed. Each bit is programmed (blown) during the wide VPP pulse and is not reversible.
VPH VPL td(1) 0
Figure 2 -- Code determination
ADDRESS 3
Dwg. WH-014A
Lock-Bit Programming. After the desired binary code is programmed, the lock bit (address 65) is then programmed (blown) (figure 4) to prevent further programming of the device. Each device should then be tested by turning it off and then on again to ensure that proper programming has been accomplished (verifying proper switch points).
VPP
PROGRAM ENABLE
BIT 3 PROGRAM (CODE 000100) ADDRESS 4
PROGRAM ENABLE
VPH VPL 0 td(1) td(1) td(0) tdP
Figure 3 -- Switch-point programming example
VPP
PROGRAM ENABLE
LOCK PROGRAM (65 PULSES)
VPH VPL td(1) 0 td(1) td(0) tdP
Figure 4 -- Lock programming
Dwg. WH-016
* In application, the terms "gear" and "target" are often interchanged. However, "gear" is preferred when motion is transferred.
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ADDRESS N (UP TO 63)
9
3250 AND 3251 PROGRAMMABLE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES
APPLICATIONS INFORMATION
External Components. It is strongly recommended that an external bypass capacitor be connected (less than 5 mm from the Hall sensor) between the supply and ground of the device to reduce both external noise and noise generated by the chopper-stabilization technique. A series resistor (RS) in combination with the bypass capacitor prevents external EMC pulses from affecting the sensor. The voltage drop across this resistor subtracts from the supply voltage and must be considered. VSUPPLY VCC(min) + (ICC x RS) where VSUPPLY is the minimum supply value (including transients), VCC(min) is the specified minimum supply voltage, ICC is the specified maximum supply current and RS is the maximum series-resistor value (including tolerances). A low operating supply voltage requires a lowvalue resistor, but noise and other considerations suggest a high-value resistor. Therefore, specify the highest value resistor that will still allow meeting the minimum operating supply voltage requirement. This will also help to minimize package power dissipation (especially under over-voltage conditions). If not included as part of the load, the output pullup resistor should be chosen to limit the current through the output transistor. Do not exceeed the absolute maximum rated output current. Internal current limiting is only intended to protect the device from output short circuits. Power Derating. Due to the internal device power dissipation, the junction temperature (TJ) will be higher than the ambient temperature (TA). To ensure that the absolute maximum junction temperature is not exceeded, the following equations should be applied: TJ = TA + (PD x RJA) where PD is the sum of the supply power ICC x VCC and the output power IOUT x VOUT(SAT) and RJA is the package thermal resistance. The specified limits for ICC and VOUT(SAT) should be used to ensure a margin of safety. Note that if an over-voltage condition occurs, ICC will increase, limited only by the Zener voltage and the external RS, and the device will likely be thermally stressed. Magnets. The simplest form of magnet that will operate these devices is a button magnet. Other methods of operation, such as linear magnets, are possible.
+5 V 1.2 k
3
OUTPUT
PTCT
2
0.1 F
CC
V
10
X
1
SUPPLY RS
Dwg. EH-013-3
Typical application
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3250 AND 3251 PROGRAMMABLE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES
CRITERIA FOR DEVICE QUALIFICATION
All Allegro sensors are subjected to stringent qualification requirements prior to being released to production. To become qualified, except for the destructive ESD tests, no failures are permitted. Qualification Test Biased Humidity (HAST) High-Temperature Operating Life (HTOL) Accelerated HTOL Autoclave, Unbiased High-Temperature (Bake) Storage Life Temperature Cycle ESD, Human Body Model ESD, Machine Model Electrical Distributions Test Method and Test Conditions JESD22-A101, TA = 85C, RH = 85% JESD22-A108, TA = 150C, TJ = 165C JESD22-A108, TA = 170C, TJ = 180C JESD22-A102, Condition C, TA = 121C, 15 psig MIL-STD-883, Method 1008, TA = 170C MIL-STD-883, Method 1010, -55C to +150C CDF-AEC-Q100-002 JESD22-A115 Per Specification Test Length 1000 hrs 1000 hrs 168 hrs 96 hrs 1000 hrs 1000 cycles Pre/Post Reading Pre/Post Reading -- Samples 77 77 77 77 77 77 3 per test 3 per test 30 Test to failure, All leads > 1 kV Test to failure, All leads > 200 V Comments VCC = VOUT = 4.2 V
APPLICATIONS INFORMATION (cont'd)
Extensive applications information for Hall-effect sensors is available in: * Hall-Effect IC Applications Guide, Application Note 27701; * Hall-Effect Devices: Soldering, Gluing, Potting, Encapsulating, and Lead Forming, Application Note 27703.1; * Soldering of Through-Hole Hall-Sensor Dervices, Application Note 27703; and * Soldering of Surface-Mount Hall-Sensor Devices, Application Note 27703.2. More detailed descriptions of the chopper-stabilized circuit operation can be found in: * Monolithic Magnetic Hall Sensor Using Dynamic Quadrature Offset Cancelation, Technical Paper STP 9710; and * Chopper-Stabilized Amplifiers With A Track-and-Hold Signal Demodulator, Technical Paper STP 99-1. All are provided in Allegro Electronic Data Book, AMS702 or at
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11
3250 AND 3251 PROGRAMMABLE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES
Transient Performance per ISO 7637-1 at TA = 23 5C
(Tested at Allegro test facility -- for engineering reference only) Pulse No.
1 2 3a 3b 4 5 6 7
Test
Inductive turn off (negative) Inductive turn off (positive) Capacitive/inductive coupling (neg) Capacitive/inductive coupling (pos) Reverse battery Load dump: Ignition coil disconnect Field decay (negative)
I
- - - - - A - -
Performance Class at Test Level II III
- - - - - C - - - - - - - C C -
IV
C C A A A E E C
100
X
Performance Class Definitions (for transient performance and EMC performance) A -- All functions of a device perform as designed during and after the exposure. B -- All functions of a device perform as designed during exposure; however, one or more of them may go beyond the specified limit tolerance. All functions return automatically to within normal limits afer exposure is removed. Memory must remain Class A. C -- One or more functions of the device do not perform as designed during exposure but return automatically to normal operation after exposure is removed. D -- One or more functions of the device do not perform as designed during exposure and do not return to normal operation until exposure is removed and the device is reset by simple "operator" action. E -- One or more functions of the device do not operform as designed during and after the exposure and cannot be returned to proper operation without repairing or replacing the device.
V
CC
1
0.1 F
2 PTCT
1.2 k +5 V
Dwg. EH-013-4
Transient & EMC test circuit
Power supply voltage transients, or device output short circuits, may be caused by faulty connectors, crimped wiring harnesses, or service errors. To prevent catastrophic failure, internal protection against overvoltage, reverse voltage, and output overloads have been incorporated to meet the automotive 12 volt system protection requirements of ISO DP7637/1. A seriesblocking diode or current-limiting resistor is required in order to survive pulse number six.
3
12
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3250 AND 3251 PROGRAMMABLE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES
ELECTROMAGNETIC COMPATIBILITY (EMC) PERFORMANCE at TA = 23 5C
(Tested at Allegro test facility -- for engineering reference only)
Transferse Electro-Magnetic (TEM) Radiation Performance per ISO 11452-3
Test severity level I = 50 V/m II = 100 V/m III = 150 V/m IV = 200 V/m Frequency band (MHz) F1 (0.01 to 10) F2 (0 to 30) F3 (30 to 80) F4 (80 to 200) I - - - - Performance Class at Test Level II III - - - A - - - C IV A A A C
Bulk Current Injection (BCI) per ISO 11452-4
Frequency band (MHz) F1 (1 to 10) F2 (10 to 30) F3 (30 to 80) F4 (80 to 200) F5 (200 to 400) I - - - - - Performance Class at Test Level II III - - - - - - - - - - IV A A A A A
Test severity level I = 25 mA II = 50 mA III = 75 mA IV = 100 mA
Direct RF per ISO 11452-7
Frequency band (MHz) F1 (0.25 to 10) F2 (10 to 30) F3 (30 to 80) F4 (80 to 200) F5 (200 to 400) I - - - - - Performance Class at Test Level II III IV V - - - - -
Test severity level I = 100 mW II = 200 mW III = 300 mW IV = 400 mW V = 500 mW
D B T
- - - - - - - - - -
- - - - -
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13
3250 AND 3251 PROGRAMMABLE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES
Sensor locations
(0.005" [0.13 mm] die placement)
Allegro
Package designator `LT'
ACTIVE AREA DEPTH 0.0305" 0.775 mm NOM 0.088" 2.24 mm 0.045" 1.14 mm
A
1 2 3
Dwg. MH-008-8A
Package designator `UA'
ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM
0.080" 2.04 mm
0.056" 1.44 mm
A
BRANDED SURFACE 1 2 3
Dwg. MH-011-9B
The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro products are not authorized for use as critical components in life-support appliances, devices, or systems without express written approval. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties that may result from its use.
Although sensor location is accurate to three sigma for a particular design, product improvements may result in small changes to sensor location.
14
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3250 AND 3251 PROGRAMMABLE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES
MECHANICAL DIMENSIONS Package designator `LT'
(SOT89/TO-243AA) Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions)
0.181 0.173 0.072 0.064 0.167 0.155 0.102 0.090
0.063 0.055
0.0173 0.0138
4.60 4.40 1.83 1.62 4.25 3.94 2.60 2.29
1.60 1.40
0.44 0.35
1
2
3
0.090 0.084
1
2
3
2.29 2.13
0.047 0.035 0.059
BSC
0.0189 0.0142 0.0221 0.0173 0.118
BSC
Dwg. MA-009-3A in
1.20 0.89 1.50
BSC
0.48 0.36 0.56 0.44 3.00
BSC
Dwg. MA-009-3A mm
0.098 0.079 B A 0.031 0.102 0.181 3 0.047 0.031
TYP
2.5 2.0 B A 0.8 2.6 4.6 1.2 0.8
TYP
1 0.028
TYP
2
1 0.7
TYP
2
3
Pads 1, 2, 3, and A -- Standard SOT89 Layout Pads 1, 2, 3, and B -- Low-Stress Version Pads 1, 2, and 3 only -- Lowest Stress, But Not Self Aligning
Dwg. MA-012-3 in
Pads 1, 2, 3, and A -- Standard SOT89 Layout Pads 1, 2, 3, and B -- Low-Stress Version Pads 1, 2, and 3 only -- Lowest Stress, But Not Self Aligning
Dwg. MA-012-3 mm
NOTES: 1. Exact body and lead configuration at vendor's option within limits shown. 2. Supplied in bulk pack (500 pieces per bag) or add "TR" to part number for tape and reel. 3. Only low-temperature (240C) reflow-soldering techniques are recommended for SOT89 devices.
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15
3250 AND 3251 PROGRAMMABLE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES
Package designator `UA'
Dimensions in Inches (controlling dimensions)
0.164 0.159
Dimensions in Millimeters (for reference only)
4.17 4.04
45
0.062 0.058
45
1.57 1.47
0.122 0.117 45 0.031
3.10 2.97 45 0.79
0.085
MAX
1
2
3
2.16
MAX
1
2
3
0.640 0.600
0.0173 0.0138
16.26 15.24
0.44 0.35
SEE NOTE
0.0189 0.0142
SEE NOTE
0.48 0.36
0.050
BSC
Dwg. MH-014E in
1.27
BSC
Dwg. MH-014E mm
Radial Lead Form (order A325xxUA-LC)
NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are measured at the widest point (parting line). 2. Exact body and lead configuration at vendor's option within limits shown. 3. Height does not include mold gate flash. 4. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm). 5. Where no tolerance is specified, dimension is nominal. 6. Supplied in bulk pack (500 pieces per bag).
1
2
3
0.620" 0.500" (15.7 mm 12.7 mm)
0.108" (2.74 mm)
0.100" (2.5 mm)
Dwg. MH-026
NOTE: Lead-form dimensions are the nominals produced on the forming equipment. No dimensional tolerance is implied or guaranteed for bulk packaging (500 pieces per bag).
16
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
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