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  july 2007 rev 2 1/9 9 ts821 1.225v micropower shunt voltage reference features 1.225v typical output voltage ultra low operating current: 45 a maximum at 25c high precision @ 25c ? +/- 2% (standard version) ? +/- 1% (a grade) ? +/- 0.5% (b grade) high stability when used with capacitive loads industrial temperature range: -40c to +85c 120ppm/c maximum temperature coefficient applications computers instrumentation battery chargers switch mode power supply battery operated equipment description the ts821 is a low power shunt voltage reference providing a stable 1.225v output voltage over the industrial temperature range (-40c to +85c). availabe in sot23-3 surface mount package, it can be designed in applications where space saving is critical. the low operating current is a key advantage for power restricted designs. in addition, the ts821 is very stable and can be used in a broad range of application conditions. l sot23-3l (plastic micropackage) pin connections (top view) www.st.com
absolute maximum ratings and operating conditions ts821 2/9 1 absolute maximum ratings and operating conditions table 1. absolute maximum ratings (amr) symbol parameter value unit i k reverse breakdown current 20 ma i f forward current 10 ma p d power dissipation (1) sot23-3 1. p d is calculated with t amb = 25c and t j = 150c and r thja = 340c/w for the sot23-3l package. 360 mw t stg storage temperature -65 to +150 c esd human body model (hbm) (2) 2. human body model: 100pf discharged through a 1.5k resistor between two pins of the device, done for all couples of pin combinati ons with other pins floating. 2kv machine model (mm) (3) 3. machine model: a 200pf cap is charged to the specif ied voltage, then discharged directly between two pins of the device with no external seri es resistor (inter nal resistor < 5 ), done for all couples of pin combinations with other pins floating. 200 v t lead lead temperature (soldering, 10 seconds) 260 c table 2. operating conditions symbol parameter value unit i min minimum operating current 45 a i max maximum operating current 12 ma t oper operating free air temperature range -40 to +85 c
ts821 electrical characteristics 3/9 2 electrical characteristics table 3. ts821 (2% precision) t amb = 25c (1) (unless otherwise specified) symbol parameter test conditions min. typ. max. unit v k reverse breakdown voltage i k = 100 a 1.200 1.225 1.250 v reverse breakdown voltage tolerance i k = 100 a -40c < t amb < +85c -25 +34 +25 +34 mv i k-min minimum operating current t amb = 25c 40 45 a -40c < t amb < +85c 50 v ref / t average temperature coefficient i k = 100 a 120 ppm/c v k / i k reverse breakdown voltage change with operating current range i k-min < i k < 1ma -40c < t amb < +85c 0.3 0.7 1 mv 1ma < i k < 12ma -40c < t amb < +85c 2.5 8 10 r ka static impedance i k = 45a to 1ma 0.25 0.5 k vh long term stability i k = 100 a, t = 1000hrs 120 ppm en wide band noise i k = 100 a, 10hz < f < 10khz 200 nv/ hz 1. limits are 100% production tested at 25c. behavior at the temperature range limits is guaranteed through correlation and by design. table 4. ts821a (1% precision) t amb = 25c (1) (unless otherwise specified) symbol parameter test conditions min. typ. max. unit v k reverse breakdown voltage i k = 100 a 1.213 1.225 1.237 v reverse breakdown voltage tolerance i k = 100 a -40c < t amb < +85c -12 -22 +12 +22 mv i k-min minimum operating current t amb = 25c 40 45 a -40c < t amb < +85c 50 v ref / t average temperature coefficient i k = 100 a 120 ppm/c v k / i k reverse breakdown voltage change with operating current range i k-min < i k < 1ma -40c < t amb < +85c 0.3 0.7 1 mv 1ma < i k < 12ma -40c < t amb < +85c 2.5 5 7 r ka static impedance i k = 45 a to 1ma 0.25 0.5 k vh long term stability i k = 100 a, t = 1000hrs 120 ppm en wide band noise i k = 100 a 10hz < f < 10khz 200 nv/ hz 1. limits are 100% production tested at 25c. behavior at the temperature range limits is guaranteed through correlation and by design.
electrical characteristics ts821 4/9 table 5. ts821b (0.5% precision) t amb = 25c (1) (unless otherwise specified) symbol parameter test conditions min. typ. max. unit v k reverse breakdown voltage i k = 100 a 1.219 1.225 1.231 v reverse breakdown voltage tolerance i k = 100 a -40c < t amb < +85c -6 -16 +6 +16 mv i k-min minimum operating current t amb = 25c 40 45 a -40c < t amb < +85c 50 v ref / t average temperature coefficient i k = 100 a 120 ppm/c v k / i k reverse breakdown voltage change with operating current range i k-min < i k < 1ma -40c < t amb < +85c 0.3 0.7 1 mv 1ma < i k < 12ma -40c < t amb < +85c 2.5 5 7 r ka static impedance i k = 45 a to 1ma 0.25 0.5 w k vh long term stability i k = 100 a, t = 1000hrs 120 ppm en wide band noise i k = 100 a 10hz < f < 10khz 200 nv/ hz 1. limits are 100% production tested at 25c. behavior at the temperature range limits is guaranteed through correlation and by design.
ts821 electrical characteristics 5/9 figure 1. reference voltage versus cathode current figure 2. reference voltage versus cathode current -1 -0.5 00.51 1.5 reference voltage (v) -8 -4 0 4 8 12 cathode current (ma) -1 -0.5 0 0.5 1 1.5 reference voltage (v) -50 0 50 100 cathode current (a) figure 3. test circuit figure 4. reference voltage versus temperature ik=(vin-vref)/r vout=vref r -40 -20 0 20 40 60 80 temperature (c) 1.19 1.2 1.21 1.22 1.23 1.24 1.25 1.26 cathode voltage (v) +0.5% -0.5% -1% +1% -2% +2% figure 5. static impedance versus temperature figure 6. noise voltage versus frequency -40 -20 0 20 40 60 80 temperature (c) 0.2 0.21 0.22 0.23 0.24 0.25 static impedance (ohms) 0 1 10 100 1,000 10,000 frequency (hz) 0 100 200 300 400 500 600 700 800 noise voltage (nv/vhz) c l =10f c l =0f c l =100f
package information ts821 6/9 3 package information in order to meet environmental requirements, stmicroelectronics offers these devices in ecopack ? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an stmicroelectronics trademark. ecopack specifications are available at: www.st.com . figure 7. pulse response for i k =100a figure 8. test circuit for pulse response at i k =100a 0246810 time (s) 3v 0v 1.225v input output 0v ik=100a output 18 k pulse generator intput figure 9. pulse response for i k =1ma figure 10. test circuit for pulse response at i k =1ma 0246810 time (s) 3v 0v 1.225v input output 0v ik=1ma output 1.8 k pulse generator intput
ts821 package information 7/9 figure 11. sot23-3 package mechanical data ref. dimensions millimeters mils min. typ. max. min. typ. max. a 0.890 1.120 35.05 44.12 a1 0.010 0.100 0.39 3.94 a2 0.880 0.950 1.020 34.65 37.41 40.17 b 0.300 0.500 11.81 19.69 c 0.080 0.200 3.15 7.88 d 2.800 2.900 3.040 110.26 114.17 119.72 e 2.100 2.64 82.70 103.96 e1 1.200 1.300 1.400 47.26 51.19 55.13 e 0.950 37.41 e1 1.900 74.82 l 0.400 0.600 15.75 23.63 l1 0.540 21.27 k0808 7110469/a
ordering information ts821 8/9 4 ordering information 5 revision history table 6. order codes part number precision temperature range package packing marking ts821ilt 2% -40c to +85c sot23-3 tape & reel l213 ts821ailt 1% l212 ts821bilt 0.5% l211 table 7. document revision history date revision changes 10-nov-2005 1 initial release. 24-jul-2007 2 removed information related to to-92. format update.
ts821 9/9 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2007 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com


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