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tl431/tl432 adjustable precision shunt regulator tl431 *so-8 is a future package document number: ds35044 rev. 6 - 2 1 of 14 www.diodes.com april 2012 ? diodes incorporated description the tl431 and tl432 are three terminal adjustable shunt regulators offering excellent te mperature stability and output current handling capability up to 100ma. the output voltage may be set to any chosen voltage between 2.5 and 36 volts by selection of two external divider resistors. the devices can be used as a r eplacement for zener diodes in many applications requiring an improvement in zener performance. diodes? tl431 has the same electrical specifications as the industr y standard ?431 and is available in 2 grades with initial tolerances of 1% and 0.5% for the a and b grades respectively. features ? temperature range -40 to +125oc ? reference voltage tolerance at 25c ? tl431a: 2.495v 1.0% ? tl431b: 2.495v 0.5% ? low output noise ? 0.2 ? typical output impedance ? sink current capability: 1ma to 100ma ? adjustable output voltage: v ref to 36v ? all devices are: ? totally lead-free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. ?green? device (note 3) applications ? opto-coupler linearisers ? shunt regulators ? improved zener ? variable reference pin assignments tl431 anode ref cathode 1 3 2 (top view) sot23 anode ref cathode nc leave floating or connect to pin 5 2 3 4 5 (top view) sot2 5 anode anode ref nc anode anode nc cathode 1 2 3 4 8 7 6 5 (top view) so-8 tl432 anode ref cathode 1 3 2 (top view) sot2 3 notes: 1. no purposely added lead. fully eu directiv e 2002/95/ec (rohs) & 2011/6 5/eu (rohs 2) compliant. 2. see http://www.diodes.com/quality/lead_free.html for more information about diodes incorporated?s definitions of halogen an d antimony free, "green" and lead-free. 3. halogen and antimony free "green? products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm t otal br + cl) and <1000ppm antimony compounds. so-8 is a future product
tl431/tl432 adjustable precision shunt regulator tl431 *so-8 is a future package document number: ds35044 rev. 6 - 2 2 of 14 www.diodes.com april 2012 ? diodes incorporated absolute maximum ratings (note 4) symbol parameter rating unit v ka cathode voltage 40 v i ka continuous cathode current 150 ma i ref reference input current -0.050 to +10 ma t j operating junction temperature +150 c t st storage temperature -55 to +150 c p d power dissipation (notes 5, 6) sot23 330 mw sot25 500 so-8* 700 notes: 4. operation above the absolute maximum rating may cause device failure. operation at the absolute maximum ratings, for extended periods, may reduce device reliability. unless otherwise stat ed voltages specified are relative to the anode pin. 5. t j , max =150c. 6. ratings apply to ambi ent temperature at 25c. recommended operating conditions symbol parameter min max unit v ka cathode voltage v ref 36 v i ka cathode current 1 100 ma t a operating ambient tem perature -40 +125 c
tl431/tl432 adjustable precision shunt regulator tl431 *so-8 is a future package document number: ds35044 rev. 6 - 2 3 of 14 www.diodes.com april 2012 ? diodes incorporated electrical characteristics (t a = +25c, unless otherwise noted) symbol parameter test conditions min typ. max unit v ref reference voltage v ka = v ref , i ka = 10ma tl431a 2.470 2.495 2.520 v tl431b 2.482 2.495 2.507 v dev deviation of reference voltage over full temperature range (note 5) v ka = v ref , i ka = 10ma t a = 0 to 70 o c 6 16 mv t a = -40 to +85 o c 14 34 t a = -40 to +125 o c 14 34 v ref v ka ratio of the change in reference voltage to the change in cathode voltage i ka = 10ma v ka = 10v to v ref -1.4 -2.7 mv/v v ka = 36v to 10v -1 -2 i ref reference input current i ka = 10ma, r1 = 10k ? , r2 = 1 4 a i ref i ref deviation over full temperature range (note 7) i ka = 10ma, r1 = 10k ? , r2 = t a = 0 to 70 o c 0.8 1.2 a t a = -40 to +85 o c 0.8 2.5 t a = -40 to +125 o c 0.8 2.5 i ka(min) minimum cathode current for regulation v ka = v ref 0.4 0.7 ma i ka(off) off-state current v ka = 36v, v ref = 0v 0.05 0.5 a |z ka | dynamic output impedance (note 8) v ka = v ref, f = 0hz 0.2 0.5 ? ja thermal resistance junction to ambient sot23 380 o c/w sot25 250 so-8* 70 notes: 7. deviation of v dev , and i ref are defined as the maximum variation of th e values over the full temperature range. the average temperature coefficient of the reference input voltage v ref is defined as: where: t2 ? t1 = full temperature change. v ref can be positive or negative depending on whether the slope is positive or negative. notes: 8. the dynamic output impedance, r z , is defined as: when the device is programmed with two external resistors r1 and r2, the dynamic output impedance of the overall circuit, is defined as: = t2 ? t1 v ref v dev v ref @ 25oc x 10 6 ppm/oc = t2 ? t1 v ref v dev v ref @ 25oc x 10 6 ppm/oc vmax vmin t1 t2 v dev = vmax - vmin temperature vmax vmin t1 t2 v dev = vmax - vmin temperature = z ka v ka i ka = z ka v ka i ka = z? v i z ka 1 + r1 r2 = z? v i = z? v i z ka 1 + r1 r2 z ka 1 + r1 r2
tl431/tl432 adjustable precision shunt regulator tl431 *so-8 is a future package document number: ds35044 rev. 6 - 2 4 of 14 www.diodes.com april 2012 ? diodes incorporated test circuits figure 1. test circuit for v ka = v ref figure 2. test circuit for v ka > v ref figure 3. test circuit for i off
tl431/tl432 adjustable precision shunt regulator tl431 *so-8 is a future package document number: ds35044 rev. 6 - 2 5 of 14 www.diodes.com april 2012 ? diodes incorporated typical performance characteristics 2400 2420 2440 2460 2480 2500 2520 2540 2560 2580 2600 -55 -35 -15 5 25 45 65 85 105 125 t free air temperature ( c ) r eference voltage vs. free air temperature a v reference voltage (mv) ref i = 10ma v = v t = 25c ka ka re f a 0 0.05 0.1 0.15 0. 2 -55 -35 -15 5 25 45 65 85 105 125 t free air temperature ( c) reference current vs. free air temperature a i reference current ( a) ref r1 = 10k r2 = i = 10ma ka -100 -50 0 50 100 150 -2 -1 0 1 2 3 v cathode voltage (v) cathode current vs. c athode voltage ka i cathode current (ma) ka v = v t = 25c ka re f a -100 0 100 200 -2 -1 0 12 3 v cathode voltage cathode current vs. cathode voltage ka i kmin i cathode current ( a) ka v = v t = 25c ka re f a 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.5 0 -75 -50 -25 0 25 50 75 100 125 t free air temperature ( c) off-state cathode current vs. free air temperature a i off-state cathode current ( a) koff v = 36v v= 0 ka ref -1.0 -0.9 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -50 -25 0 25 50 75 100 125 v = 3v to 36v ka t fre e air temp erature (c) r atio of delta reference voltage to delta cat hode voltage vs. free air temperature a dv /dv (mv/v) ref ka
tl431/tl432 adjustable precision shunt regulator tl431 *so-8 is a future package document number: ds35044 rev. 6 - 2 6 of 14 www.diodes.com april 2012 ? diodes incorporated typical performance characteristics (cont.) 200 220 240 260 280 300 320 340 360 380 40 0 10 100 1k 10k 100k f- frequency (hz) equivalent input noise voltage vs. frequency v = equivalent input noise voltage nv/ hz n i = 10ma v = v t = 25c ka ka re f a -15 -10 -5 0 5 10 1 5 012345678910 time (seconds) equivalent input noise voltage over a 10-s period vn - equivalent input noise voltage - v i = 10ma v = v t = 25c ka ka re f a figure 4. test circuit for noise input voltage
tl431/tl432 adjustable precision shunt regulator tl431 *so-8 is a future package document number: ds35044 rev. 6 - 2 7 of 14 www.diodes.com april 2012 ? diodes incorporated typical performance characteristics (cont.) 0 10 20 30 40 50 60 70 100 1k 10k 100k 1m 10m f frequency (hz) small-signal voltage amplification vs. frequency a small-signal voltage amplification (db) v i = 10ma t = 25c ka a test circuit for voltage amplification 0.0 0.1 1.0 10.0 100.0 1k 10k 100k 1m 10m z reference impedance ( ) ka i = 10ma t = 25c ka a f frequency (h z) r eference impedance vs. frequency test circuit for reference impedance
tl431/tl432 adjustable precision shunt regulator tl431 *so-8 is a future package document number: ds35044 rev. 6 - 2 8 of 14 www.diodes.com april 2012 ? diodes incorporated typical performance characteristics (cont.) 0 1 2 3 4 5 6 01 2 345678910 t time ( s) pulse response input and output voltage (v) output inp ut t = 25c a test circuit for pulse response 0 10 20 30 40 50 60 70 80 90 100 0.00001 0.0001 0.001 0.01 0.1 1 d c -load capacitance - uf stability boundary conditions l i - c athode current - ma ka a v = v b v = 5v c v = 10v d v = 15v ka ref ka ka ka sta b le sta b le sta b le d c cb b a 10 t = 25c a test circuit for curve a test circuit for curves b, c, d test circuit for curves b, c, d the device is stable under all conditions with a load capacitance not exceeding 50pf. the device is stable under all conditions with a load capacitance between 5nf and 20nf. the dev ice is stable under all condit ions with a load capacitance exceeding 300nf. with a cathode current not exceeding 5ma, the device is stable with any load capacitance.
tl431/tl432 adjustable precision shunt regulator tl431 *so-8 is a future package document number: ds35044 rev. 6 - 2 9 of 14 www.diodes.com april 2012 ? diodes incorporated applications information
tl431/tl432 adjustable precision shunt regulator tl431 *so-8 is a future package document number: ds35044 rev. 6 - 2 10 of 14 www.diodes.com april 2012 ? diodes incorporated ordering information device package code packaging (note 9) 7? tape and reel ammo box quantity part number suffix quantity part number suffix tl431a(b)sa-7 sa sot23 3000/tape & reel -7 na na tl431a(b)w5-7 w5 sot25 3000/tape & reel -7 na na tl431a(b)s-13* s so-8* 2500/tape & reel -13 na na tl432a(b)sa-7 sa sot23 3000/tape & reel -7 na na * suffix ?b? denotes tl431b device. notes: 9. pad layout as shown on diodes inc. suggested pad la yout document ap02001, which can be found on our website at http://www.diodes.c om/datasheets/ap02001.pdf.
tl431/tl432 adjustable precision shunt regulator tl431 *so-8 is a future package document number: ds35044 rev. 6 - 2 11 of 14 www.diodes.com april 2012 ? diodes incorporated marking information (1) sot23 1 2 3 xx y w x (top view) xx : identification code w : week : a~z : 1~26 week; x : a~z : green y :year0~9 a~z : 27~52 week; z represents 52 and 53 week device package identification code tl431asa sot23 aa tl431bsa sot23 ab tl432asa sot23 ba tl432bsa sot23 bb (2) sot25 device package identification code tl431aw5 sot25 aa tl431bw5 sot25 ab (3) so-8* tl431x (top view ) yy ww x x part number logo ww : week : 01~52; 52 yy : year : 08, 09,10~ xx : internal code 8765 1 234 represents 52 and 53 week x: tolerance a = 1%, b = 0.5% tl431x (top view ) yy ww x x part number logo ww : week : 01~52; 52 yy : year : 08, 09,10~ xx : internal code 8765 1 234 represents 52 and 53 week x: tolerance a = 1%, b = 0.5%
tl431/tl432 adjustable precision shunt regulator tl431 *so-8 is a future package document number: ds35044 rev. 6 - 2 12 of 14 www.diodes.com april 2012 ? diodes incorporated package outline dimensions (all dimensions in mm) (1) package type: sot25 (2) package types: sot23 sot25 dim min max typ a 0.35 0.50 0.38 b 1.50 1.70 1.60 c 2.70 3.00 2.80 d ? ? 0.95 h 2.90 3.10 3.00 j 0.013 0.10 0.05 k 1.00 1.30 1.10 l 0.35 0.55 0.40 m 0.10 0.20 0.15 n 0.70 0.80 0.75 0 8 ? a ll dimensions in mm sot23 dim min max typ a 0.37 0.51 0.40 b 1.20 1.40 1.30 c 2.30 2.50 2.40 d 0.89 1.03 0.915 f 0.45 0.60 0.535 g 1.78 2.05 1.83 h 2.80 3.00 2.90 j 0.013 0.10 0.05 k 0.903 1.10 1.00 k1 - - 0.400 l 0.45 0.61 0.55 m 0.085 0.18 0.11 0 8 - a ll dimensions in mm a m j l d b c h k n a m j l d f b c h k g k1
tl431/tl432 adjustable precision shunt regulator tl431 *so-8 is a future package document number: ds35044 rev. 6 - 2 13 of 14 www.diodes.com april 2012 ? diodes incorporated package outline dimensions (all dimensions in mm) (3) package types: so-8* so-8* dim min max a - 1.75 a 1 0.10 0.20 a 2 1.30 1.50 a 3 0.15 0.25 b 0.3 0.5 d 4.85 4.95 e 5.90 6.10 e1 3.85 3.95 e 1.27 typ h - 0.35 l 0.62 0.82 0 8 all dimensions in mm gauge plane seating plane detail ?a? detail ?a? e e1 h l d e b a2 a1 a 45 7 ~ 9 a3 0.254
tl431/tl432 adjustable precision shunt regulator tl431 *so-8 is a future package document number: ds35044 rev. 6 - 2 14 of 14 www.diodes.com april 2012 ? diodes incorporated important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products desc ribed herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized a pplication. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its representatives against any damages arising out of the use of diodes incorporated products in such safety-critical, life support devices or systems. copyright ? 2012, diodes incorporated www.diodes.com

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