Specifications
| Type | Description |
|---|---|
| Part Number | TL431AIDR |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Inferred Category | Power_Management |
| Component Type | Power_IC |
| Package Case | SOIC (D), 8-pin, 4.90 mm x 3.90 mm nominal body |
| Device Function | Three-terminal adjustable shunt regulator; TL431/TL432 family description |
| Initial Reference Voltage Tolerance | 1%; A grade, TA=25°C |
| Operating Free-Air Temperature Range | -40°C to 85°C; TL43xxI device grade |
| Adjustable Output Voltage Range | Vref to 36 V; using two external resistors |
| Nominal Reference Voltage | Approximately 2.5 V; description text |
| Typical Output Impedance | 0.2 ohm; typical value |
| Sink Current Capability | 1 mA to 100 mA; operating capability |
| Cathode Voltage Absolute Maximum | 37 V; with respect to ANODE, over operating free-air temperature range |
| Continuous Cathode Current Absolute Maximum Range | -100 mA to 150 mA; over operating free-air temperature range |
| Reference Input Current Absolute Maximum Range | -0.05 mA to 10 mA; over operating free-air temperature range |
| Operating Junction Temperature Absolute Maximum | 150°C; absolute maximum rating |
| Storage Temperature Range | -65°C to 150°C; absolute maximum rating |
| ESD Rating, HBM | ±2000 V; human body model, ANSI/ESDA/JEDEC JS-001 pins |
| ESD Rating, CDM | ±1000 V; charged-device model, JEDEC JESD22-C101 |
| Recommended Cathode Voltage Range | Vref to 36 V; recommended operating conditions |
| Recommended Continuous Cathode Current Range | 1 mA to 100 mA; recommended operating conditions |
| Thermal Resistance, Junction-to-Ambient | 97°C/W; D package, 8 pins |
| Thermal Resistance, Junction-to-Case Top | 39°C/W; D package, 8 pins |
| Reference Voltage | 2470 mV min, 2495 mV typ, 2520 mV max; TL431AI inferred from A-grade 1% tolerance, VKA=Vref, IKA=10 mA, TA=25°C |
| Minimum Cathode Current for Regulation | 0.4 mA typ, 1 mA max; VKA=Vref |
| Reference Input Current | 2 µA typ, 4 µA max; IKA=10 mA, R1=10 kohm, R2=infinity |
| Off-State Cathode Current | 0.1 µA typ, 1 µA max; VKA=36 V, Vref=0 V |
| Dynamic Impedance | 0.2 ohm typ, 0.5 ohm max; VKA=Vref, f<=1 kHz, IKA=1 mA to 100 mA |
| Ratio of Reference Voltage Change to Cathode Voltage Change | -1.4 mV/V typ, -2.7 mV/V max; IKA=10 mA, delta VKA=10 V - Vref |
| Ratio of Reference Voltage Change to Cathode Voltage Change | -1 mV/V typ, -2 mV/V max; IKA=10 mA, delta VKA=36 V - 10 V |
| SOIC Pin 1 Function | CATHODE; TL431x D package pin configuration |
| SOIC Pin 2 Function | ANODE; TL431x D package pin configuration |
| SOIC Pin 3 Function | ANODE; TL431x D package pin configuration |
| SOIC Pin 8 Function | REF; TL431x D package pin configuration |
| Datasheet Status | request_only |
Product Overview
The TL431AIDR is a Texas Instruments precision programmable shunt regulator for Power_Management circuits. The device function is a three-terminal adjustable shunt regulator, with a nominal reference voltage of approximately 2.5 V and A-grade initial reference-voltage tolerance of 1% at TA = 25°C.
With two external resistors, the adjustable output voltage range is Vref to 36 V. Recommended operation supports cathode voltage from Vref to 36 V and continuous cathode current from 1 mA to 100 mA. Electrical characteristics include 0.2 ohm typical output impedance, 0.2 ohm typical dynamic impedance, and 0.5 ohm maximum dynamic impedance under the stated test condition.
The TL431AIDR is supplied in the SOIC (D), 8-pin package with a 4.90 mm x 3.90 mm nominal body. For the TL431x D package pin configuration, pin 1 is CATHODE, pins 2 and 3 are ANODE, and pin 8 is REF. Thermal values for the 8-pin D package include 97°C/W junction-to-ambient and 39°C/W junction-to-case top resistance.
Key Features
- Three-terminal adjustable shunt regulator function
- A-grade 1% initial reference tolerance at 25°C
- Adjustable output range from Vref to 36 V
- Approximately 2.5 V nominal reference voltage
- 1 mA to 100 mA sink current capability
- 0.2 ohm typical output impedance
- 0.4 mA typical minimum cathode current for regulation
- 0.1 µA typical off-state cathode current
- SOIC D 8-pin package with REF on pin 8
- -40°C to 85°C operating free-air range
Typical Applications
- Adjustable shunt regulation
- Programmable voltage reference circuits
- Power management reference nodes
- Cathode-current regulated circuits
- External-resistor voltage setting
- SOIC-based power assemblies
Procurement Notes
When requesting a quote for TL431AIDR, 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 function does the TL431AIDR provide?
The TL431AIDR is a three-terminal adjustable shunt regulator from Texas Instruments. It is described as a precision programmable shunt regulator with an approximately 2.5 V nominal reference.
What output voltage range can TL431AIDR support?
Using two external resistors, the TL431AIDR adjustable output voltage range is Vref to 36 V. The recommended cathode voltage range is also specified as Vref to 36 V.
What package and pin functions are specified?
The device uses the SOIC (D), 8-pin package with a 4.90 mm x 3.90 mm nominal body. In the TL431x D package, pin 1 is CATHODE, pins 2 and 3 are ANODE, and pin 8 is REF.
What current range is recommended for operation?
The recommended continuous cathode current range is 1 mA to 100 mA. The datasheet facts also list 0.4 mA typical and 1 mA maximum minimum cathode current for regulation at VKA = Vref.
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.