Specifications
| Type | Description |
|---|---|
| Part Number | TL431IDR |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Component Type | Power_IC |
| Package / Case | SOIC (D), 8 pins, 4.90 mm × 3.90 mm nominal |
| Device Function | Three-terminal adjustable shunt regulator; TL431 family description |
| Reference Voltage Tolerance | 2%; standard grade, 25°C; TL431IDR has blank accuracy grade |
| Adjustable Output Voltage Range | Vref to 36 V; set by two external resistors |
| Typical Output Impedance | 0.2 Ω; typical device characteristic |
| Sink Current Capability | 1 mA to 100 mA; operating capability |
| Operating Free-Air Temperature | -40°C to 85°C; TL43xxI device grade |
| Cathode Voltage Absolute Maximum | 37 V max; with respect to anode |
| Continuous Cathode Current Absolute Maximum | -100 mA to 150 mA; over operating free-air temperature range |
| Reference Input Current Absolute Maximum | -0.05 mA to 10 mA; over operating free-air temperature range |
| Operating Junction Temperature Absolute Maximum | 150°C max; 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 |
| ESD Rating CDM | ±1000 V; charged-device model, JEDEC JESD22-C101 |
| Thermal Resistance Junction-to-Ambient | 97°C/W; D package, SOIC-8 |
| Thermal Resistance Junction-to-Case Top | 39°C/W; D package, SOIC-8 |
| Recommended Cathode Voltage | Vref to 36 V; recommended operating conditions |
| Recommended Continuous Cathode Current | 1 mA to 100 mA; recommended operating conditions |
| Reference Voltage | 2440 mV min, 2495 mV typ, 2550 mV max; TL431I, VKA = Vref, IKA = 10 mA, TA = 25°C |
| Reference Input Voltage Deviation | 5 mV typ, 50 mV max; TL431I all other devices including D package, VKA = Vref, IKA = 10 mA, full temperature range |
| Reference Voltage Change Ratio | -1.4 mV/V typ, -2.7 mV/V max; TL431I, IKA = 10 mA, ΔVKA = 10 V - Vref |
| Reference Voltage Change Ratio | -1 mV/V typ, -2 mV/V max; TL431I, IKA = 10 mA, ΔVKA = 36 V - 10 V |
| Reference Input Current | 2 µA typ, 4 µA max; TL431I, IKA = 10 mA, R1 = 10 kΩ, R2 = infinity |
| Reference Input Current Deviation | 0.8 µA typ, 2.5 µA max; TL431I, IKA = 10 mA, R1 = 10 kΩ, R2 = infinity, full temperature range |
| Minimum Cathode Current for Regulation | 0.4 mA typ, 1 mA max; TL431I, VKA = Vref |
| Off-State Cathode Current | 0.1 µA typ, 1 µA max; TL431I, VKA = 36 V, Vref = 0 |
| Dynamic Impedance | 0.2 Ω typ, 0.5 Ω max; TL431I, VKA = Vref, f ≤ 1 kHz, IKA = 1 mA to 100 mA |
| Cathode Pin | Pin 1; TL431x D package, SOIC top view |
| Reference Pin | Pin 8; TL431x D package, SOIC top view |
| Anode Pins | Pins 2, 3, 6, 7; TL431x D package, SOIC top view |
| Datasheet Status | request_only |
Product Overview
Electrical operating data for TL431IDR includes a recommended cathode voltage from Vref to 36 V and recommended continuous cathode current from 1 mA to 100 mA. For TL431I conditions at VKA = Vref, IKA = 10 mA, and TA = 25°C, the reference voltage is 2440 mV minimum, 2495 mV typical, and 2550 mV maximum. Dynamic impedance is 0.2 Ω typical and 0.5 Ω maximum for IKA from 1 mA to 100 mA at f ≤ 1 kHz.
Key Features
- Three-terminal adjustable shunt regulator function
- 2% reference voltage tolerance at 25°C
- Adjustable Vref-to-36 V output range
- 1 mA to 100 mA sink current capability
- 0.2 Ω typical output impedance characteristic
- -40°C to 85°C operating free-air temperature
- 2440 mV to 2550 mV reference voltage range
- 0.2 Ω typical, 0.5 Ω maximum dynamic impedance
- SOIC-8 D package with defined cathode, anode, reference pins
- HBM ±2000 V and CDM ±1000 V ESD ratings
Typical Applications
- Adjustable shunt regulation
- Programmable voltage reference circuits
- Power-management reference nodes
- Cathode-current controlled regulation
- SOIC-8 board assemblies
- Vref-to-36 V adjustable outputs
Procurement Notes
When requesting a quote for TL431IDR, 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 TL431IDR?
TL431IDR is a Texas Instruments programmable shunt voltage reference. The extracted datasheet facts identify it as a three-terminal adjustable shunt regulator in the TL431 family.
What package is used for TL431IDR?
TL431IDR is supplied in the D package, an SOIC with 8 pins. The nominal package dimensions are 4.90 mm × 3.90 mm.
What voltage range can TL431IDR regulate?
The adjustable output voltage range is Vref to 36 V when set by two external resistors. The recommended cathode voltage is also specified as Vref to 36 V.
What are the main TL431IDR pin assignments?
For the TL431x D package SOIC top view, the cathode is Pin 1, the reference input is Pin 8, and the anode connections are Pins 2, 3, 6, and 7.
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.