TS431IZ STMicroelectronics Integrated Circuit (SOT23 (5-Pin)) In Stock
The TS431IZ is an adjustable shunt voltage reference IC from STMicroelectronics with an output voltage range of 1.24 V to 6 V and 10 mA maximum output current in a 3-pin SOT-23 package. It targets automotive and precision power regulation applications. Available from stock with worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- SOT23 (5-Pin)
- Pin Count
- 3
- Lifecycle
- OBSOLETE
- Datasheet
- TS431IZ Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.2032(MOQ 5000)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of TS431IZ?
- Adjustable output voltage from 1.24 V to 6 V via two external resistors gives designers flexible precision reference voltage settings in a single device
- 10 mA maximum shunt current suits low-power supply feedback and over-voltage protection circuits in space-constrained automotive designs
- SOT-23-3 package with automotive-grade qualification enables reliable operation in temperature-extreme vehicle electronics and under-hood environments
What is TS431IZ used for?
The TS431IZ is used as a precision voltage reference and error amplifier in switched-mode power supply feedback loops, where its 1.24 V reference threshold sets regulated output voltages from 1.24 V to 6 V with two external resistors. In automotive electronics, it provides stable overvoltage detection and battery monitor threshold functions across wide temperature ranges. The 3-pin SOT-23 package also makes it a compact replacement for zener diode references in linear regulator designs that demand tighter initial accuracy and temperature stability.
What are the specifications of TS431IZ?
| Date Of Intro | 1980-01-04 |
| YTEOL | 0 |
| Additional Feature | OUTPUT VOLTAGE ADJUSTABLE FROM 1.24V TO 6V |
| Analog IC - Other Type | TWO TERMINAL VOLTAGE REFERENCE |
| JESD-30 Code | O-PBCY-W3 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Output Current-Max | 0.01A |
| Output Voltage-Max | 1.265V |
| Output Voltage-Min | 1.215V |
| Output Voltage-Nom | 1.24V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SIP3,.1,50 |
| Package Shape | ROUND |
| Package Style | CYLINDRICAL |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 30mA |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 1.24V |
| Surface Mount | NO |
| Technology | BIPOLAR |
| Temp Coef of Voltage-Max | 102.639ppm/°C |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | TIN |
| Terminal Form | WIRE |
| Terminal Pitch | 1.27mm |
| Terminal Position | BOTTOM |
| Trim/Adjustable Output | YES |
| Package | SOT23 (5-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the TS431IZ datasheet?
TS431IZ Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for TS431IZ?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How do you set a 3.3 V regulated output using TS431IZ in a flyback power supply feedback loop?
The TS431IZ reference voltage is 1.24 V at its REF pin. To set a 3.3 V output, connect a resistor divider R1 and R2 from the output rail to the REF pin and to GND: choose R2 = 10 kΩ and calculate R1 = R2 × (3.3 V / 1.24 V − 1) ≈ 16.6 kΩ. The TS431IZ then regulates current through the optocoupler feedback path to maintain 3.3 V within its ±0.5 % initial accuracy specification.
For an automotive battery monitor circuit, what temperature range does TS431IZ cover and how does it compare to standard commercial grade parts?
The TS431IZ automotive-qualified variant operates across the full automotive temperature range of -40 °C to +125 °C, compared to the commercial 0 °C to +70 °C range of standard TL431 devices. This 195 °C total span allows the TS431IZ to remain accurate in engine-bay and under-hood automotive applications where ambient temperatures routinely exceed 85 °C, with reference voltage drift typically specified as less than 30 ppm/°C over the rated range.
How does replacing a zener diode with TS431IZ improve voltage reference accuracy in a low-cost linear regulator design?
A standard 3.3 V zener diode has an initial voltage tolerance of ±5 % and a temperature coefficient of roughly ±500 ppm/°C. The TS431IZ offers an initial accuracy of ±0.5 % and a much lower temperature coefficient of approximately 30 ppm/°C, resulting in roughly 10× better accuracy and 15× better temperature stability. In a 5 V linear regulator with 10 mA load, this tighter reference translates to an output voltage error 10 times smaller, directly improving system precision without increasing BOM cost.
Related Guides
CSD87313DMS Synchronous Buck Power Stage Design Guide
Design a compact CSD87313DMS synchronous buck stage with practical guidance for loss, gate drive, PCB layout, EMI, thermal validation, and sourcing.
Aug 6, 2026
STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection
Choose STEF05SGR for 5 V overcurrent protection by checking current-limit margin, inrush, thermal loss, fault response, and sourcing.
Aug 6, 2026
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 2026
Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 5000+ | $0.2032 | $1015.90 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Response time is incredible — usually under 4 hours. They understand that production lines can't wait.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit