component
TL431A
Public Made by Adomby adom
PJSEMI Voltage References, SOT-23. 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
markdownTL431A
PJSEMI · Voltage References · SOT-23
TL431A from PJSEMI, in a SOT-23. 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 | Reference | input | Reference input pin for output voltage programming; accepts reference current of 1.5 to 4 µA typical, absolute maximum -0.05 to +10 mA. |
| 2 | Cathode | output | Regulated output cathode with programmable voltage from VREF to 36V and continuous sink/source current capability of 1 to 100 mA; minimum regulation current 0.45 to 1 mA. |
| 3 | Anode | power_in | Anode return/common connection; cathode voltage referenced to anode with absolute maximum rating of 37V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | PJSEMI |
| Package | SOT-23 |
| Category | Power Management ICs |
| 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 | VREF | 2.48 | 2.495 | 2.51 | V | VKA=VREF, IKA=10mA | 2 |
| Deviation of Reference Input Voltage Over Temperature | ∆VREF | 4.5 | 17 | mV | VKA=VREF,IKA=10mA, -40°C ≤TA≤+85°C | 2 | |
| Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage | ∆VREF/∆VKA | -1 | -2.7 | mV/V | IKA=10mA; VKA=10V~VREF | 2 | |
| Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage | ∆VREF/∆VKA | -0.5 | -2 | mV/V | IKA=10mA; VKA=36V~10V | 2 | |
| Reference Input Current | IREF | 1.5 | 4 | µA | IKA=10mA, R1=10kΩ, R2=∞ | 2 | |
| Deviation of Reference Input Current Over Full Temperature Range | ∆IREF | 0.4 | 1.2 | µA | IKA=10mA, R1=10kΩ, R2=∞, -25°C ≤TA≤+85°C | 2 | |
| Minimum Cathode Current for Regulation | IKA(MIN) | 0.45 | 1 | mA | VKA=VREF | 2 | |
| Off-State Cathode Current | IKA(OFF) | 0.05 | 1 | µA | VKA=36V, VREF=0 | 2 | |
| Dynamic Impedance | ZKA | 0.15 | 0.5 | Ω | VKA=VREF, IKA=1~ 100mA,f≤1.0kHz | 2 | |
| Cathode Voltage | VKA | 37 | V | 1 | |||
| Cathode Current Range (Continuous) | IKA | -100 | 150 | mA | 1 | ||
| Reference Input Current Range | IREF | -0.05 | 10 | mA | 1 | ||
| Power Dissipation | PD | 350 | mW | 1 | |||
| Operating Junction Temperature | TJ | 150 | °C | 1 | |||
| Operating Ambient Temperature | TOPR | -40 | 85 | °C | 1 | ||
| Storage Temperature | TSTG | -65 | 150 | °C | 1 | ||
| Cathode Voltage | VKA | 36 | V | 1 | |||
| Cathode Current | IKA | 1 | 100 | mA | 1 |
CAD (KiCad official)
- Symbol:
TL431A - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
tl431a-etched.step/tl431a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431a.step/tl431a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: PJSEMI datasheet (4 pp, sha256
5453711ab2e3e4fa, retrieved 2026-10-27, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusoff(skipped (clean text read)), 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).