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TL431CSF
Public Made by Adomby adom
HTC Korea TAEJIN Tech Voltage Reference, 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
markdownTL431CSF
HTC Korea TAEJIN Tech · Voltage Reference · SOT-23
TL431CSF from HTC Korea TAEJIN Tech, 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 voltage input that sets the cathode regulation point (VREF about 2.495 V; TL431C 2.483 to 2.507 V at IK = 10 mA) and must be driven through the external divider resistors. |
| 2 | Anode | power_in | Ground (common) terminal of the shunt regulator, through which the cathode current returns; recommended cathode current IK is 0.5 mA to 100 mA. |
| 3 | Cathode | power_in | Cathode (regulated output) terminal, specified as Input Supply Voltage in the datasheet, with recommended operating voltage VREF to 40 V, absolute maximum cathode voltage 42 V, and continuous cathode current -100 to 150 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | HTC Korea TAEJIN Tech |
| Package | SOT-23 |
| 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 (TL431C, 0.5%) | VREF | 2.483 | 2.495 | 2.507 | V | VKA =VREF, IK =10mA | 4 |
| Deviation of Reference Input Voltage (full range) | ΔVREF/ΔT | 8 | 20 | mV | VKA = VREF, IK =10mA, TA =Full Range | 4 | |
| Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (ΔVKA=10V-VREF) | ΔVREF/ΔVKA | -1.4 | -2.7 | mV/V | IK =10mA, ΔVKA=10V -VREF | 4 | |
| Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (ΔVKA=36V-10V) | ΔVREF/ΔVKA | -1 | -2 | mV/V | IK =10mA, ΔVKA=36V-10V | 4 | |
| Reference Input Current | IREF | 1.8 | 4 | uA | IKA=10mA, R1=10kΩ, R2=∞ | 4 | |
| Deviation of Reference Input Current (full range) | ΔIREF/ΔT | 0.4 | 1.2 | uA | IK =10mA, R1=10kΩ, R2=∞, TA =Full Range | 4 | |
| Minimum Cathode Current for Regulation | IK(MIN) | 0.5 | mA | VKA= VREF | 4 | ||
| Off-State Cathode Current | IK(OFF) | 0.17 | 0.9 | uA | VKA=36V, VREF=0 | 4 | |
| Dynamic Impedance | ZKA | 0.27 | 0.5 | Ω | VKA= VREF, IK =1mA~100mA, f ≤ 1kHz | 4 | |
| Cathode Voltage (recommended) | VKA | 40 | V | Minimum is VREF (not a numeric limit) | 2 | ||
| Cathode Current (recommended) | IK | 0.5 | 100 | mA | 2 | ||
| Cathode Voltage (absolute maximum) | VKA | 42 | V | 1 | |||
| Cathode Current Range (Continuous) | IK | -100 | 150 | mA | Continuous | 1 | |
| Reference Input Current Range | IREF | -0.05 | 10 | mA | 1 | ||
| Junction Temperature Range | TJ | -40 | 150 | ℃ | 1 | ||
| Operating Temperature Range | TOPR | -40 | 125 | ℃ | 1 | ||
| Storage Temperature Range | TSTG | -65 | 150 | ℃ | 1 |
CAD (KiCad official)
- Symbol:
TL431CSF - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
tl431csf-etched.step/tl431csf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431csf.step/tl431csf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: HTC Korea TAEJIN Tech datasheet (12 pp, sha256
0a0d5fc0a3221190, retrieved 2026-10-18, 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).