component
TL431CDR
Public Made by Adomby adom
Texas Instruments Voltage Reference, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownTL431CDR
Texas Instruments · Voltage Reference · SOIC-8
TL431CDR from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | CATHODE | output | Output terminal supporting 1 to 100 mA continuous shunt current sink with programmable voltage from Vref (approximately 2.5V) to 36V and 0.2Ω typical output impedance. |
| 2 | ANODE | power_in | Common ground return pin for regulator; must be connected to system ground with all other ANODE pins for proper current distribution. |
| 3 | ANODE | power_in | Common ground return pin for regulator; must be connected to system ground with all other ANODE pins for proper current distribution. |
| 4 | NC | unconnected | No internal connection; leave unconnected per datasheet specifications. |
| 5 | NC | unconnected | No internal connection; leave unconnected per datasheet specifications. |
| 6 | ANODE | power_in | Common ground return pin for regulator; must be connected to system ground with all other ANODE pins for proper current distribution. |
| 7 | ANODE | power_in | Common ground return pin for regulator; must be connected to system ground with all other ANODE pins for proper current distribution. |
| 8 | REF | input | Reference input pin with nominal threshold of 2.495V requiring 2 to 4 µA input current for linear operation as feedback node to set regulator output voltage. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reference Voltage | Vref | 2440 | 2495 | 2550 | mV | VKA = Vref, IKA = 10mA | 6 |
| Deviation of reference input voltage over full temperature range (All other devices) | VI(dev) | 4 | 25 | mV | VKA = Vref, IKA = 10mA; All other devices | 6 | |
| Ratio of change in reference voltage to change in cathode voltage | ΔVref / ΔVKA | -1.4 | -2.7 | mV/V | IKA = 10mA, ΔVKA = 10V - Vref | 6 | |
| Ratio of change in reference voltage to change in cathode voltage | ΔVref / ΔVKA | -1 | -2 | mV/V | IKA = 10mA, ΔVKA = 36V - 10V | 6 | |
| Reference Input Current | Iref | 2 | 4 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 6 | |
| Deviation of reference input current over full temperature range | II(dev) | 0.4 | 1.2 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 6 | |
| Minimum cathode current for regulation | Imin | 0.4 | 1 | mA | VKA = Vref | 6 | |
| Off-state cathode current | Ioff | 0.1 | 1 | µA | VKA = 36V, Vref = 0 | 6 | |
| Dynamic Impedance | /ZKA/ | 0.2 | 0.5 | Ω | VKA = Vref, f ≤ 1kHz, IKA = 1mA to 100mA | 6 | |
| Cathode Voltage | VKA | 37 | V | 5 | |||
| Continuous Cathode Current Range | IKA | -100 | 150 | mA | 5 | ||
| Reference Input Current | II(ref) | -0.05 | 10 | mA | 5 | ||
| Operating Junction Temperature Range | TJ | 150 | °C | 5 | |||
| Storage Temperature Range | Tstg | -65 | 150 | °C | 5 | ||
| Cathode Voltage | VKA | 36 | V | 5 | |||
| Continuous Cathode Current Range | IKA | 1 | 100 | mA | 5 | ||
| Operating Free-Air Temperature | TA | 0 | 70 | °C | TL43xxC | 5 | |
| Junction-to-ambient thermal resistance (D package, 8 pins) | RθJA | 97 | °C/W | D (SOIC, 8 pins) | 5 | ||
| Junction-to-case (top) thermal resistance (D package, 8 pins) | RθJC(top) | 39 | °C/W | D (SOIC, 8 pins) | 5 |
CAD (KiCad official)
- Symbol:
TL431CDR - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
tl431cdr-etched.step/tl431cdr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431cdr.step/tl431cdr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (85 pp, sha256
ed2e90697de4e2c5, retrieved 2026-09-22, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).