Specifications
| Type | Description |
|---|---|
| Part Number | TL431 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Component Type | Power_IC |
| Package / Case | SOT-23-3 2.90mm x 1.30mm; SOT-23-5 2.90mm x 1.60mm; SOIC-8 4.90mm x 3.90mm; PDIP-8 9.50mm x 6.35mm; SOP-8 6.20mm x 5.30mm |
| Reference Voltage Tolerance | 0.5% |
| Reference Voltage Tolerance | 1% |
| Reference Voltage Tolerance | 2% |
| Adjustable Output Voltage | Vref to 36 V |
| Reference Voltage | approximately 2.5 V |
| Output Impedance | 0.2 ohm typical |
| Sink Current Capability | 1 mA to 100 mA |
| Typical Temperature Drift | 6 mV |
| Typical Temperature Drift | 14 mV |
| Operating Free-Air Temperature | 0°C to 70°C |
| Operating Free-Air Temperature | -40°C to 85°C |
| Operating Free-Air Temperature | -40°C to 125°C |
| Cathode Voltage Absolute Maximum | 37 V max |
| Continuous Cathode Current Absolute Maximum Range | -100 mA to 150 mA |
| Reference Input Current Absolute Maximum | -0.05 mA to 10 mA |
| Operating Junction Temperature Absolute Maximum | 150°C max |
| Storage Temperature Range | -65°C to 150°C |
| ESD Rating Human Body Model | ±2000 V |
| ESD Rating Charged Device Model | ±1000 V |
| Recommended Cathode Voltage | Vref min, 36 V max |
| Recommended Continuous Cathode Current Range | 1 mA to 100 mA |
| Thermal Resistance Junction-to-Ambient | 85°C/W |
| Thermal Resistance Junction-to-Ambient | 149°C/W |
| Thermal Resistance Junction-to-Ambient | 97°C/W |
| Thermal Resistance Junction-to-Ambient | 95°C/W |
| Thermal Resistance Junction-to-Ambient | 259°C/W |
| Thermal Resistance Junction-to-Ambient | 206°C/W |
| Thermal Resistance Junction-to-Ambient | 206°C/W |
| Thermal Resistance Junction-to-Ambient | 140°C/W |
| Thermal Resistance Junction-to-Ambient | 52°C/W |
| Reference Voltage | 2440 mV min, 2495 mV typ, 2550 mV max |
| Reference Voltage Deviation Over Temperature | 6 mV typ, 16 mV max |
| Reference Voltage Deviation Over Temperature | 4 mV typ, 25 mV max |
| Ratio of Reference Voltage Change to Cathode Voltage Change | -1.4 mV/V typ, -2.7 mV/V max |
| Ratio of Reference Voltage Change to Cathode Voltage Change | -1 mV/V typ, -2 mV/V max |
| Reference Input Current | 2 µA typ, 4 µA max |
| Reference Input Current Deviation Over Temperature | 0.4 µA typ, 1.2 µA max |
| Minimum Cathode Current for Regulation | 0.4 mA typ, 1 mA max |
| Off-State Cathode Current | 0.1 µA typ, 1 µA max |
| Dynamic Impedance | 0.2 ohm typ, 0.5 ohm max |
| Reference Voltage | 2440 mV min, 2495 mV typ, 2550 mV max |
| Reference Voltage Deviation Over Temperature | 14 mV typ, 34 mV max |
| Reference Voltage Deviation Over Temperature | 5 mV typ, 50 mV max |
| Reference Input Current Deviation Over Temperature | 0.8 µA typ, 2.5 µA max |
| Reference Voltage | 2440 mV min, 2495 mV typ, 2550 mV max |
| Reference Voltage Deviation Over Temperature | 14 mV typ, 34 mV max |
| Datasheet Status | request_only |
Product Overview
The TL431 is a Texas Instruments precision programmable shunt reference for Power_Management designs. Its output voltage is adjustable from Vref to 36 V when set by two external resistors, with a nominal reference of approximately 2.5 V. Tolerance grades are specified at TA=25°C as 0.5% for B grade, 1% for A grade and 2% for standard grade.
Recommended operating conditions list cathode voltage from Vref minimum to 36 V maximum and continuous cathode current from 1 mA to 100 mA. The TL431C/TL432C electrical data specifies 2440 mV minimum, 2495 mV typical and 2550 mV maximum reference voltage at VKA=Vref, IKA=10 mA and TA=25°C, with 0.2 ohm typical dynamic impedance.
Package options include SOT-23-3, SOT-23-5, SOIC-8, PDIP-8 and SOP-8 body sizes. Thermal resistance depends on package, ranging from 52°C/W for the PK 3-pin package to 259°C/W for the DCK 6-pin package. Operating free-air temperature ranges cover 0°C to 70°C, -40°C to 85°C and -40°C to 125°C device families.
Key Features
- Precision programmable shunt reference for Power_Management circuits
- Adjustable output voltage from Vref to 36 V
- Approximately 2.5 V nominal reference voltage
- 0.5%, 1% and 2% tolerance grades at 25°C
- 1 mA to 100 mA operating sink current range
- 0.2 ohm typical output impedance
- C, I and Q temperature-range device options
- 37 V maximum cathode-voltage absolute rating
- ±2000 V HBM and ±1000 V CDM ESD ratings
- Multiple SOT-23, SOIC, PDIP and SOP package sizes
Typical Applications
- Programmable shunt reference circuits
- Adjustable voltage reference nodes
- Power-management reference circuits
- Cathode-current regulation circuits
- Temperature-range qualified reference designs
- Compact SOT-23 reference layouts
- Through-hole PDIP reference assemblies
Procurement Notes
When requesting a quote for TL431, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.
FAQ
What type of device is the TL431?
The TL431 is a Texas Instruments precision programmable shunt reference in the Power_Management category. Its output voltage is adjustable from Vref to 36 V when set by two external resistors.
What reference voltage does the TL431 provide?
The extracted datasheet facts describe an approximately 2.5 V nominal reference. For TL431C, TL431I and TL431Q conditions at VKA=Vref, IKA=10 mA and TA=25°C, reference voltage is 2440 mV minimum, 2495 mV typical and 2550 mV maximum.
What cathode current range is recommended for TL431?
The recommended continuous cathode current range is 1 mA to 100 mA. The same 1 mA to 100 mA range is also listed as the operating sink current capability.
Which package options are listed for TL431?
The package-case facts list SOT-23-3 2.90mm x 1.30mm, SOT-23-5 2.90mm x 1.60mm, SOIC-8 4.90mm x 3.90mm, PDIP-8 9.50mm x 6.35mm and SOP-8 6.20mm x 5.30mm.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.