Adjustable shunt voltage reference IC (automotive for SOT235) Datasheet production data Z TO92 (plastic package) L SOT235 (plastic micropackage) Description The TS431 is a lowvoltage, threeterminal, adjustable shunt voltage reference. The output voltage can be set to any value between V ref (1.24 V) and 6 V using two external resistors. The TS431 is able to operate at a lower voltage (1.24 V) and lower cathode current than the widelyused TL431 and TL1431 shunt voltage reference. When driving an optocoupler, the TS431 is particularly suitable for regulating 3.3 V switching power supplies. Features AECQ1 qualified (SOT235) Low voltage operation: 1.24 to 6 V 2%, 1% and.5% voltage precision Wide operating range cathode current: 6 µa to 3 ma Low output impedance:.2 Ω Typically stable for any capacitive loads ESD protection: Human body model: 2 kv Machine model: 2 V 1 ppm/ C temperature coefficient Automotive grade version available June 218 DocID5558 Rev 12 1/16 This is information on a product in full production. www.st.com
Contents TS431 Contents 1 Pinout..................................................... 3 2 Absolute maximum ratings and operating conditions............. 4 3 Electrical characteristics..................................... 5 Definition of output voltage change over temperature range................. 5 4 Application information...................................... 9 5 Package information........................................ 1 5.1 SOT235 package information..................................11 5.2 TO92 (tape ammopack and tape and reel) package information....... 12 5.3 TO92 (bulk) package information............................... 13 6 Ordering information....................................... 14 7 Revision history........................................... 15 2/16 DocID5558 Rev 12
Pinout 1 Pinout Figure 1. Pinout Z TO92 (plastic package) Figure 2. Pinout L SOT235 (plastic micropackage) DocID5558 Rev 12 3/16 16
Absolute maximum ratings and operating conditions TS431 2 Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings Symbol Parameter Value Unit V KA Cathode to anode voltage 1 V I k Continuous cathode current range 2 to +4 ma I ref Reference input current range.5 to +3 ma P d Power dissipation TO92 package SOT235 package T stg Storage temperature range 65 to +15 C 625 5 mw Table 2. Operating conditions Symbol Parameter Value Unit V KA Cathode to anode voltage 1.24 to 6 V I k Cathode current (1).6 to 3 ma T oper Operating free air temperature range 4 to +125 C 1. Please refer to Section 4: Application information for more details. Table 3. Thermal data Symbol Parameter TO92 SOT235L Unit R thjc Thermal resistance junction to case 57 136 C/W R thja Thermal resistance junction to ambient 2 25 C/W 4/16 DocID5558 Rev 12
Electrical characteristics 3 Electrical characteristics Table 4. T amb = 25 C (unless otherwise specified) Symbol Parameter Test conditions Min. Typ. Max. Unit V ref Output voltage V KA = V ref at I k = 1 A TS431 TS431A TS431B 1.215 1.228 1.234 1.24 1.24 1.24 1.265 1.252 1.246 V Output voltage change (1) (2) V ref I k = 1 A, V KA = V ref < T amb < +7 C 4 < T amb < +85 C 4 < T amb < +15 C 4 < T amb < +125 C 9 16 18 21 mv Vref Vka Ratio of change in reference input voltage to change in cathode to anode voltage I k = 1 ma V KA = 6 V to V ref 1.8 2.7 mv/v I ref Reference input current I k = 1 ma 7 16 na I ref Reference input current deviation over temperature range I k = 1 ma, R 1 = 1 k R 2 = 4 < T amb < +85 C 4 < T amb < +125 C 7 9 16 24 na I min Minimum cathode current for regulation V KA = V ref 4 6 A I off Offstate cathode current V KA = 6 V, V ref =.1.1 A R KA Static impedance V KA = V ref, I k =.1 to 15 ma.2.4 1. Limits are 1% production tested at 25 C. Behavior at the temperature range limits is guaranteed through correlation and by design. 2. See definition below. Definition of output voltage change over temperature range V ref is defined as the difference between the maximum and minimum values obtained over the full temperature range. V ref = V ref max V ref min Figure 3. Output voltage change over temperature range Vref max. Vref min. T1 T2 Temperature DocID5558 Rev 12 5/16 16
Electrical characteristics TS431 Figure 4. Reference voltage vs. temperature Figure 5. Test circuit for V KA = V ref 1.252 1.248 Vka = Vref Ik = 1 µa Input Output Reference voltage (V) 1.244 1.24 1.236 Ik Vka 1.232 Vref 1.228 4 2 2 4 6 8 1 12 Temperature ( C) Figure 6. Cathode voltage vs. cathode current 15 Figure 7. Cathode voltage vs. cathode current 1.5 Ika Cathode current (ma) 1 5 5 1 Vka = Vref T = 25 C Vka Cathode voltage (V) 1.5 4 C +25 C +85 C +125 C 15 1.5.5 1 1.5 Vka Cathode voltage (V) 1 2 3 4 5 6 Ika Cathode current (µa) Figure 8. Reference input current vs. temperature 1 Figure 9. Static impedance vs. temperature.4 Iref Reference current (na) 8 6 4 2 Ik = 1mA R1 = 1 K R2 = + Rka Static Impedance (Ohms).3.2.1 Vka = Vref Ik = 1µA to 15mA 4 2 2 4 6 8 1 12 Temperature ( C) 4 2 2 4 6 8 1 12 Temperature ( C) 6/16 DocID5558 Rev 12
Electrical characteristics Figure 1. Offstate current vs. temperature Figure 11. Test circuit for offstate current measurement 2 Input Vka=6V IOff OffState current (na) 15 1 5 Ioff 4 2 2 4 6 8 1 12 Temperature ( C) Figure 12. Ratio of change in reference input voltage to change in V KA voltage vs. temperature Figure 13. Test circuit for V KA > V ref Ratio of change in reference input voltage (mv/v) 1 2 Ik = 1mA Vka = 6V to Vref 3 4 2 2 4 6 8 1 12 Temperature ( C) Input R1 R2 Vka Ik Iref Vref Vka = Vref. (1+R1/R2) + Iref. R1 Figure 14. Phase and gain vs. frequency Figure 15. Test circuit for phase and gain measurement 6 Phase 15 Gain (db) 5 4 3 2 1 Gain Phase margin # 5 1 5 5 1 Phase ( ) Input 1µF 6.8K 4.3K Ik=1µA Vref 1µF Output 15 1E+3 1E+4 1E+5 1E+6 Frequency (Hz) DocID5558 Rev 12 7/16 16
Electrical characteristics TS431 Figure 16. Pulse response at I k = 1 µa Figure 17. Test circuit for pulse response at I k = 1 µa input and output voltage (V) 3 2 1 Input voltage Output voltage Pulse Generator f=1khz Intput 5 18K Ik=1µA Output 1 2 3 4 5 6 7 8 9 1 Time (µs) Figure 18. Pulse response at I k = 1 ma Figure 19. Test circuit for pulse response at I k = 1 ma input and output voltage (V) 3 2 1 Input voltage Output voltage Pulse Generator f=1khz Intput 5 1.8K Ik=1mA Output 1 2 3 4 5 6 7 Time (µs) Figure 2. Equivalent input noise vs. frequency 25 Equivalent input noise (nv/vhz) 2 15 1 5 Vka = Vref Ik = 1 µa T=25 C.1 1 1 1 1 Frequency (KHz) 8/16 DocID5558 Rev 12
Application information 4 Application information The TS431 is a generalpurpose lowpower adjustable shunt voltage reference, capable of operating with a cathode current as low as 6 µa and up to 3 ma. The main static parameters of the TS431 voltage reference are specified in Table 4 on page 5. Since the TS431 is designed for generalpurpose applications with a broad range of cathode currents, voltages and loads, when designing with the device in applications requiring fast dynamic response (turnon/off and/or pulsed load conditions) it should be considered that upon application of power, the time required for the V KA voltage to reach its final value within a specified error range depends on several factors, among which the temperature, cathode current and capacitive load inrush current are the most influential. The dynamic response of the device to fast turnon/off, load and temperature changes is optimized when the cathode current is not in the lower end of the operating range (I K > 5 µa). DocID5558 Rev 12 9/16 16
Package information TS431 5 Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ECOPACK is an ST trademark. 1/16 DocID5558 Rev 12
Package information 5.1 SOT235 package information Figure 21. SOT235 package outline. Table 5. SOT235 package mechanical data Dimensions Symbol Millimeters Inches Min. Typ. Max. Min. Typ. Max. A.9 1.45.35.57 A1..15..6 A2.9 1.3.35.51 b.35.5.14.2 C.9.2.3.8 D 2.8 3..11.118 H 2.6 3..12.118 E 1.5 1.75.59.69 e.95.37 e1 1.9.75 L.35.55.14.22 DocID5558 Rev 12 11/16 16
Package information TS431 5.2 TO92 (tape ammopack and tape and reel) package information Figure 22. TO92 (tape ammopack and tape and reel) package outline A1 P P T H L1 H1 H A d W W W1 I1 H W2 D F1 F2 P2 P Table 6. TO92 (tape ammopack and tape and reel) package mechanical data Dimensions (millimeters) Dimensions (Inches) Symbol Min. Typ. Max. Min. Typ. Max. AL 5..197 A 5..197 T 4..157 d.45.18 I1 2.5.98 P 11.7 12.7 13.7.461.5.539 PO 12.4 12.7 13.488.5.512 P2 5.95 6.35 6.75.234.25.266 F1/F2 2.4 2.5 2.8.94.98.11 h 1 1.39.39 P 1 1.39.39 W 17.5 18. 19..689.79.748 W 5.7 6 6.3.224.236.248 W1 8.5 9 9.75.335.354.384 W2.5.2 H 2.787 H 15.5 16 16.5.61.63.65 H1 25.984 DO 3.8 4. 4.2.15.157.165 L1 11.433 12/16 DocID5558 Rev 12
Package information 5.3 TO92 (bulk) package information Figure 23. TO92 (bulk) package outline Table 7. TO92 (bulk) package mechanical data Dimensions Symbol Millimeters Inches Min. Typ. Max. Min. Typ. Max. L 1.27.5 B 3.2 3.7 4.2.126.1457.1654 O1 4.45 5. 5.2.1752.1969.247 C 4.58 5.3 5.33.183.198.298 K 12.7.5 O2.47.5.58.16.197.2 a.35.138 DocID5558 Rev 12 13/16 16
Ordering information TS431 6 Ordering information Table 8. Order codes Order codes Precision Temp. range Packages Packing Marking TS431ILT 2% TS431AILT 1% SOT235 L271 TS431BILT.5% L27 Tape and reel TS431IYLT (1) 2% L274 TS431AIYLT (1) 1% 4 C, + 125 C SOT235 (automotive grade level) L276 TS431BIYLT (1).5% L273 TS431IZ/IZT/IZAP 2% Bulk (Z), TS431I TS431AIZ/AIZT/AIZAP 1% TO92 tape and reel (ZT) TS431AI TS431BIZ/BIZT/BIZAP.5% or ammopack (AP) TS431BI 1. Qualification and characterization according to AECQ1 and AECQ3 or equivalent, advanced screening according to AECQ1 and AECQ2 or equivalent. L272 14/16 DocID5558 Rev 12
Revision history 7 Revision history Table 9. Document revision history Date Revision Changes 1Sep23 1 Initial release. 1Oct25 2 PPAP references inserted in the datasheet. See the order codes table. Minor changes to formatting and grammar. 2Jan26 3 TS431AIYLT PPAP reference inserted. See the order codes table. 22Sep26 4 25Apr27 5 3Aug27 6 Included footnote on automotive grade qualification to order codes table. Updated package information (changed mils to inches). Resized graphics on cover page. Moved definition of output voltage change from Table 3 footnote to separate section below table. Corrected errors in SOT235 package mechanical data. Removed erroneous drawing for TO92 tape & reel package. Updated drawing for TO92 bulk package. Modified footnote related to automotive grade qualification in Table 5: Order codes, and reordered order codes. 27Aug21 7 Modified note for package SOT235 on page 1. 15Nov212 8 Modified note 1 Table 5 on page 12. 17Dec212 9 Added note 1 Table 2 on page 2 and Section 3 on page 7. 12Mar213 1 Added features Automotive grade version available in cover page. 3Nov217 11 Added automotive qualification for SOT235 in the whole document. Updated main title on page 1. Added Section 1: Pinout on page 3. Updated Table 1 on page 4 (removed note 1). Added Table 3 on page 4. Minor modifications throughout document. 27Jun218 12 Added precision value in Table 8: Order codes. DocID5558 Rev 12 15/16 16
IMPORTANT NOTICE PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries ( ST ) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST s terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document. 218 STMicroelectronics All rights reserved 16/16 DocID5558 Rev 12