Specifications
| Type | Description |
|---|---|
| Part Number | TL431CDR |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | SOIC (D), 8 pins, 4.90 mm × 3.90 mm nominal body size |
| Component Type | Power_IC |
| Device Function | Three-terminal adjustable shunt regulator; TL431/TL432 family description |
| Initial Reference Voltage Tolerance | 2%; standard grade, 25°C; TL431CDR has blank accuracy grade |
| Adjustable Output Voltage Range | Vref to 36 V; set with two external resistors |
| Reference Voltage Approximation | Approximately 2.5 V; output voltage lower limit Vref |
| Typical Output Impedance | 0.2 Ω; device description/features |
| Sink Current Capability | 1 mA to 100 mA; feature list |
| Operating Free-Air Temperature | 0°C to 70°C; TL43xxC temperature grade |
| Cathode Voltage Absolute Maximum | 37 V max; with respect to anode |
| Continuous Cathode Current Absolute Maximum Range | -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 ratings |
| Storage Temperature Range | -65°C to 150°C; absolute maximum ratings |
| 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 |
| Junction-to-Ambient Thermal Resistance | 97°C/W; D package, SOIC-8 |
| Junction-to-Case Top Thermal Resistance | 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; TL431C, VKA = Vref, IKA = 10 mA, TA = 25°C |
| Reference Input Voltage Deviation Over Temperature | 4 mV typ, 25 mV max; TL431C, D SOIC and all other non-SOT23-3 devices, VKA = Vref, IKA = 10 mA |
| Ratio of Reference Voltage Change to Cathode Voltage Change | -1.4 mV/V typ, -2.7 mV/V max; TL431C, ΔVKA = 10 V - Vref, IKA = 10 mA |
| Ratio of Reference Voltage Change to Cathode Voltage Change | -1 mV/V typ, -2 mV/V max; TL431C, ΔVKA = 36 V - 10 V, IKA = 10 mA |
| Reference Input Current | 2 µA typ, 4 µA max; TL431C, IKA = 10 mA, R1 = 10 kΩ, R2 = ∞ |
| Reference Input Current Deviation Over Temperature | 0.4 µA typ, 1.2 µA max; TL431C, IKA = 10 mA, R1 = 10 kΩ, R2 = ∞ |
| Minimum Cathode Current for Regulation | 0.4 mA typ, 1 mA max; TL431C, VKA = Vref |
| Off-State Cathode Current | 0.1 µA typ, 1 µA max; TL431C, VKA = 36 V, Vref = 0 |
| Dynamic Impedance | 0.2 Ω typ, 0.5 Ω max; TL431C, VKA = Vref, f ≤ 1 kHz, IKA = 1 mA to 100 mA |
| Datasheet Status | request_only |
Product Overview
TL431CDR is a Texas Instruments TL431/TL432-family three-terminal adjustable shunt regulator for Power_Management circuits. It provides a precision programmable shunt-regulator function with an output voltage set from Vref to 36 V using two external resistors. The reference lower limit is approximately 2.5 V, and the TL431C electrical table specifies 2440 mV minimum, 2495 mV typical, and 2550 mV maximum reference voltage at VKA = Vref, IKA = 10 mA, and TA = 25°C.
The device supports recommended continuous cathode current from 1 mA to 100 mA and recommended cathode voltage from Vref to 36 V. Dynamic impedance is specified as 0.2 Ω typical and 0.5 Ω maximum for VKA = Vref, f ≤ 1 kHz, and IKA from 1 mA to 100 mA.
TL431CDR is supplied in the SOIC (D) 8-pin package with a 4.90 mm × 3.90 mm nominal body size. Package thermal data includes 97°C/W junction-to-ambient resistance and 39°C/W junction-to-case top resistance for the D SOIC-8 package. The C temperature grade supports 0°C to 70°C operating free-air temperature.
Key Features
- Three-terminal adjustable shunt regulator function
- Standard-grade 2% initial reference voltage tolerance
- Output adjustable from Vref to 36 V
- Approximately 2.5 V reference lower limit
- 1 mA to 100 mA sink current capability
- 0.2 Ω typical output impedance
- 0°C to 70°C operating free-air temperature
- 37 V maximum cathode voltage rating
- SOIC-8 package with 4.90 mm × 3.90 mm body
- ±2000 V HBM and ±1000 V CDM ESD ratings
Typical Applications
- Adjustable shunt regulation
- Programmable voltage reference circuits
- Vref-to-36 V output setting
- 1 mA to 100 mA sink-current designs
- SOIC-8 power-management assemblies
- 0°C to 70°C operating environments
Procurement Notes
When requesting a quote for TL431CDR, 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 regulator is the TL431CDR?
TL431CDR is a Texas Instruments three-terminal adjustable shunt regulator. The extracted datasheet facts identify it as a precision programmable shunt regulator in the TL431/TL432 family.
What output voltage range can TL431CDR be set for?
The output voltage can be adjusted from Vref to 36 V using two external resistors. The reference voltage lower limit is approximately 2.5 V.
What package is used for TL431CDR?
TL431CDR uses the SOIC (D) 8-pin package. The nominal body size is 4.90 mm × 3.90 mm, with listed SOIC-8 thermal resistances of 97°C/W junction-to-ambient and 39°C/W junction-to-case top.
What cathode current range is recommended for operation?
The recommended continuous cathode current range is 1 mA to 100 mA. The electrical characteristics also list a minimum cathode current for regulation of 0.4 mA typical and 1 mA maximum.
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.