component
TL431CDBZR
Public Made by Adomby adom
Texas Instruments Voltage Reference, SOT-23-3. 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
markdownTL431CDBZR
Texas Instruments · Voltage Reference · SOT-23-3
TL431CDBZR from Texas Instruments, in a SOT-23-3. 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 | bidirectional | Shunt regulator current/voltage node (I/O): cathode voltage VKA is recommended to range from Vref to 36V with continuous cathode current IKA of 1mA to 100mA (absolute maximum VKA=37V, IKA=-100mA to 150mA); minimum regulated cathode current Imin is 0.4-1mA depending on grade. |
| 2 | REF | input | Reference input (I) that sets the threshold voltage relative to the common ANODE; the internal 2.5V (nominal 2440-2550mV depending on grade) reference requires a reference input current Iref of typically 2µA (max 4µA) and must not be left floating since absolute maximum reference input current range is -0.05mA to 10mA. |
| 3 | ANODE | output | Common pin (O) of the device, typically connected to circuit ground, providing the return path for the cathode and reference currents. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-3 |
| Category | Power Management (PMIC) |
| Pins | 3 |
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 | 7 |
| Reference voltage deviation over temperature range (SOT23-3) | VI(dev) | 6 | 16 | mV | VKA = Vref，IKA = 10mA | 7 | |
| Ratio of reference voltage change to cathode voltage change | ΔVref/ΔVKA | -1.4 | -2.7 | mV/V | IKA = 10mA，ΔVKA = 10V - Vref | 7 | |
| Ratio of reference voltage change to cathode voltage change | ΔVref/ΔVKA | -1 | -2 | mV/V | IKA = 10mA，ΔVKA = 36V - 10V | 7 | |
| Reference input current | Iref | 2 | 4 | µA | IKA = 10mA，R1 = 10kΩ，R2 = ∞ | 7 | |
| Reference input current deviation over temperature range | II(dev) | 0.4 | 1.2 | µA | IKA = 10mA，R1 = 10kΩ，R2 = ∞ | 7 | |
| Minimum cathode current for regulation | Imin | 0.4 | 1 | mA | VKA = Vref | 7 | |
| Off-state cathode current | Ioff | 0.1 | 1 | µA | VKA = 36V，Vref = 0 | 7 | |
| Dynamic impedance | /ZKA/ | 0.2 | 0.5 | Ω | VKA = Vref，f ≤ 1kHz，IKA = 1mA 至 100mA | 7 | |
| Cathode voltage | VKA | 36 | V | Minimum printed as Vref (not a number) | 6 | ||
| Continuous cathode current range | IKA | 1 | 100 | mA | 6 | ||
| Operating free-air temperature range (TL43xxC) | TA | 0 | 70 | °C | TL43xxC, free-air | 6 | |
| Cathode voltage | VKA | 37 | V | 6 | |||
| Continuous cathode current range | IKA | -100 | 150 | mA | 6 | ||
| Reference input current | II(ref) | -0.05 | 10 | mA | 6 | ||
| Operating junction temperature range | TJ | 150 | °C | 6 | |||
| Storage temperature range | Tstg | -65 | 150 | °C | 6 | ||
| Junction-to-ambient thermal resistance (DBZ, SOT-23-3) | RθJA | 206 | °C/W | 6 | |||
| Junction-to-case (top) thermal resistance (DBZ, SOT-23-3) | RθJC(top) | 76 | °C/W | 6 |
CAD (KiCad official)
- Symbol:
TL431CDBZR - Footprint:
Package_TO_SOT_SMD:SOT-23-3 - 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files:
tl431cdbzr-etched.step/tl431cdbzr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431cdbzr.step/tl431cdbzr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (86 pp, sha256
313277b9351e61ed, retrieved 2026-09-23, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- 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).