component
TL431ASC
Public Made by Adomby adom
PJSEMI 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
markdownTL431ASC
PJSEMI · Voltage Reference · SOT-23-3
TL431ASC from PJSEMI, in a SOT-23-3. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | Ref | input | Reference input that sets the programmable output voltage; Vref is approximately 2.495 V and the output is set with two external resistors. |
| 2 | Cathode | passive | Cathode is the regulated output; cathode voltage must be between VREF and 36 V and cathode current between 1 mA and 100 mA. |
| 3 | Anode | passive | Anode is the other terminal of the shunt path; the datasheet gives the cathode current range (continuous -100 to +150 mA absolute maximum) measured through the device. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | PJSEMI |
| 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 Input Voltage (TL431A 0.5%) | VREF | 2.483 | 2.495 | 2.507 | V | Fig1; VKA=VREF, IKA=10mA | 4 |
| Deviation of Reference Input Voltage Over Temperature | ΔVREF | 4.5 | 17 | mV | VKA=VREF, IKA=10mA, -40°C ≤ TA ≤ +85°C | 4 | |
| Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (10V to VREF) | ΔVREF/ΔVKA | -1 | -2.7 | mV/V | Fig2; IKA=10mA; ΔVKA=10V~VREF | 4 | |
| Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (36V to 10V) | ΔVREF/ΔVKA | -0.5 | -2 | mV/V | Fig2; IKA=10mA; ΔVKA=36V~10V | 4 | |
| Reference Input Current | IREF | 1.5 | 4 | µA | Fig2; IKA=10mA, R1=10KΩ, R2=∞ | 4 | |
| Deviation of Reference Input Current Over Full Temperature Range | ΔIREF | 0.4 | 1.2 | µA | Fig2; IKA=10mA, R1=10KΩ, R2=∞, -20°C ≤ TA ≤ +85°C | 4 | |
| Minimum Cathode Current for Regulation | IKA(MIN) | 0.45 | 1 | mA | Fig1; VKA=VREF | 4 | |
| Off-State Cathode Current | IKA(OFF) | 0.05 | 1 | µA | Fig3; VKA=36V, VREF=0 | 4 | |
| Dynamic Impedance | ZKA | 0.15 | 0.5 | Ω | VKA=VREF, IKA=1~100mA, f≤1.0KHz | 4 | |
| Cathode Voltage (absolute maximum) | VKA | 37 | V | 3 | |||
| Cathode Current Range (continuous) | IKA | -100 | 150 | mA | 3 | ||
| Operating Junction Temperature | TJ | 150 | °C | 3 | |||
| Storage Temperature Range | TSTG | -65 | 150 | °C | 3 | ||
| Cathode Voltage (recommended) | VKA | 36 | V | Minimum printed as VREF (not numeric); see review_required | 3 | ||
| Cathode Current (recommended) | IKA | 1 | 100 | mA | 3 | ||
| Operating Ambient Temperature Range | TOPR | -40 | 125 | °C | 3 | ||
| Junction-to-Ambient Thermal Resistance, SOT-23-3 | RθJA | 416 | °C/W | SOT-23-3 package | 3 |
CAD (KiCad official)
- Symbol:
TL431ASC - Footprint:
Package_TO_SOT_SMD:SOT-23-3 - 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files:
tl431asc-etched.step/tl431asc-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431asc.step/tl431asc.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: PJSEMI datasheet (10 pp, sha256
7c0f5f7aa8485986, retrieved 2026-10-19, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(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).