component
TL431BCM3
Public Made by Adomby adom
HGSEMI Voltage Reference, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownTL431BCM3
HGSEMI · Voltage Reference · SOT-23
TL431BCM3 from HGSEMI, 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 | CATHODE | bidirectional | Shunt current/voltage input for the regulator; the datasheet limits VKA to 36 V recommended (37 V absolute maximum) and IKA to 1 mA to 100 mA. |
| 2 | REF | input | Threshold input referenced to the common anode, which must be driven with at least about 4 µA of reference current and must not be left floating; for the TL431BC the reference voltage is 2483 to 2507 mV. |
| 3 | ANODE | power_in | Common pin, normally connected to ground, that returns the cathode current and sets the reference point for the REF input. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| 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 voltage | Vref | 2483 | 2495 | 2507 | mV | VKA = Vref, IKA = 10 mA | 10 |
| Deviation of reference input voltage over full temperature range | VI(dev) | 6 | 16 | mV | VKA = Vref, IKA = 10 mA | 10 | |
| Ratio of change in reference voltage to change in cathode voltage | ΔVref / ΔVKA | -1.4 | -2.7 | mV/V | IKA = 10 mA; ΔVKA = 10 V, Vref | 10 | |
| Ratio of change in reference voltage to change in cathode voltage | ΔVref / ΔVKA | -2 | mV/V | IKA = 10 mA; ΔVKA = 36 V, 10 V | 10 | ||
| Reference input current | Iref | 2 | 4 | µA | IKA = 10 mA, R1 = 10 kΩ, R2 = ∞ | 10 | |
| Deviation of reference input current over full temperature range | II(dev) | 0.8 | 1.2 | µA | IKA = 10 mA, R1 = 10 kΩ, R2 = ∞ | 10 | |
| Minimum cathode current for regulation | Imin | 0.4 | 0.6 | mA | VKA = Vref | 10 | |
| Off-state cathode current | Ioff | 0.1 | 0.5 | µA | VKA = 36 V, Vref = 0 | 10 | |
| Dynamic impedance | /zKA/ | 0.2 | 0.5 | Ω | VKA = Vref, f ≤ 1 kHz, IKA = 1 mA to 100 mA | 10 | |
| Cathode voltage | VKA | 36 | V | Recommended operating conditions; printed minimum is Vref (not a numeric value) | 5 | ||
| Cathode current | IKA | 1 | 100 | mA | 5 | ||
| Operating free-air temperature (TL43xxC grade, applies to TL431BCM3) | TA | 0 | 70 | °C | TL43xxC | 5 | |
| Cathode voltage | VKA | 37 | V | Footnote (2) as printed | 5 | ||
| Continuous cathode current range | IKA | -100 | 150 | mA | 5 | ||
| Reference input current range | II(ref) | -0.05 | 10 | mA | 5 | ||
| Operating virtual junction temperature | TJ | 150 | °C | 5 | |||
| Storage temperature range | Tstg | -65 | 150 | °C | 5 | ||
| Lead temperature (soldering, 10 seconds) | TL | 260 | °C | Soldering, 10 seconds | 5 | ||
| Electrostatic discharge, human-body model (HBM) | V(ESD) | -2000 | 2000 | V | Per ANSI/ESDA/JEDEC JS-001 | 5 | |
| Electrostatic discharge, charged-device model (CDM) | V(ESD) | -1000 | 1000 | V | Per JEDEC JESD22-C101 | 5 |
CAD (KiCad official)
- Symbol:
TL431BCM3 - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
tl431bcm3-etched.step/tl431bcm3-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431bcm3.step/tl431bcm3.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: HGSEMI datasheet (28 pp, sha256
89d7314982a4fe34, 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).