Texas Instruments TL431AQPK
| Parameters | |
|---|---|
| Series | - |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) |
| RoHS Status | ROHS3 Compliant |
| Package / Case | TO-243AA |
| Mfr | Texas Instruments |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C ~ 125°C (TA) |
| Current - Supply | - |
| Output Type | Adjustable |
| Voltage - Input | - |
| Tolerance | ±1% |
| Temperature Coefficient | - |
| Current - Output | 100 mA |
| Supplier Device Package | SOT-89-3 |
| Reference Type | Shunt |
| Current - Cathode | 700 µA |
| Voltage - Output (Min/Fixed) | 2.495V |
| Noise - 0.1Hz to 10Hz | - |
| Noise - 10Hz to 10kHz | - |
| Voltage - Output (Max) | 36 V |
| Package | Tape & Reel (TR) |
| Product Status | Active |
| Base Product Number | TL431 |
| REACH Status | REACH Unaffected |
| Standard Package | 1,000 |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
TL431AQPK programmable shunt voltage reference ic
The TL431AQPK from Texas Instruments is a precision programmable shunt voltage reference integrated circuit designed for applications requiring accurate voltage regulation and reference generation with exceptional thermal stability. This three-terminal adjustable voltage reference operates over a wide cathode current range of 1.0 mA to 100 mA, providing a stable reference voltage adjustable from 2.495V to 36V through two external resistors with a typical reference voltage tolerance of ±0.5% at 25°C. Housed in a TO-92 plastic package, the device features a low dynamic output impedance of 0.2Ω typical and a wide operating temperature range of -40°C to +125°C, making it ideal for switching power supplies, battery chargers, instrumentation systems, and automotive electronics where precise voltage regulation is critical. The TL431AQPK's unique combination of high precision, temperature stability, and flexible programmability makes it suitable for applications including voltage monitoring, over-voltage protection circuits, and error amplification in feedback control systems.
TL431AQPK Applications
The TL431AQPK is extensively used in switch-mode power supplies as an error amplifier and voltage reference in feedback loops, providing precise output voltage regulation in AC-DC adapters, server power supplies, and industrial power systems. Battery charging systems utilize the device for voltage monitoring and charge termination control in portable electronics, electric vehicle chargers, and renewable energy storage systems. Instrumentation applications include precision voltage references for data acquisition systems, multimeters, and sensor signal conditioning circuits requiring stable voltage references. Automotive electronics employ the TL431AQPK for voltage monitoring in engine control units, battery management systems, and infotainment equipment where its wide temperature range ensures reliable operation.
Alternative Shunt Regulator IC Recommendations
● LM4040AIM3-2.5/NOPB (Texas Instruments): A precision 2.5V shunt voltage reference with ±0.1% initial accuracy and low 60 ppm/°C temperature coefficient in a SOT-23 package.
● REF3030AIDBZT (Texas Instruments): A 3.0V series voltage reference with 50 ppm/°C maximum temperature drift and 250 μA quiescent current for low-power applications.
● ADR5040AKSZ-REEL7 (Analog Devices): A 4.096V precision shunt reference with ±0.1% initial accuracy and 25 ppm/°C temperature coefficient for high-precision applications.
● MAX6126AASA25+ (Maxim Integrated): An ultra-precision 2.5V voltage reference with 2 ppm/°C temperature drift and 0.02% initial accuracy for metrology applications.
