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
Key Features
- 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
Applications
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.
Specifications
| 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 |
Alternate & Equivalent Parts
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.
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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 |
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