component
LM431BIM
Public Made by Adomby adom
HGSEMI Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOP-8. 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
markdownLM431BIM
HGSEMI · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOP-8
LM431BIM from HGSEMI, in a SOP-8. 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 | passive | Cathode (K) of the shunt regulator; output terminal, adjustable from Vref (about 2.5V) up to 36V, with an absolute maximum VKA of 37V and IKA up to 150mA continuous. |
| 2 | ANODE | passive | Anode (A) of the shunt regulator, connected to the most negative supply/ground potential. |
| 3 | ANODE | passive | Anode (A) of the shunt regulator, connected to the most negative supply/ground potential. |
| 4 | NC | unconnected | No connection. |
| 5 | NC | unconnected | No connection. |
| 6 | ANODE | passive | Anode (A) of the shunt regulator, connected to the most negative supply/ground potential. |
| 7 | ANODE | passive | Anode (A) of the shunt regulator, connected to the most negative supply/ground potential. |
| 8 | REF | input | Reference input of the shunt regulator with nominal Vref of 2.495V (LM431B: 2.470V to 2.520V) and reference input current up to 10mA absolute maximum. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
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 (LM431B) | VREF | 2.47 | 2.495 | 2.52 | V | VKA=VREF, IKA=10mA | 4 |
| Dynamic impedance | ZKA | 0.2 | 0.5 | Ω | VKA=VREF, IKA=1 to 100mA, f≤1.0KHz | 4 | |
| Off-state cathode current | IKA (Off) | 0.1 | 1 | μA | VKA=36V, VREF=0V | 4 | |
| Reference input current | IREF | 1.5 | 4 | μA | IKA=10mA, R1=10KΩ, R2=∞ | 4 | |
| Minimum cathode current for regulation | IKA (Min) | 1 | mA | VKA =VREF - 0.4 | 4 | ||
| Cathode-anode voltage | VKA | 37 | V | 3 | |||
| Cathode current range (continuous) | IKA | 150 | mA | 3 | |||
| Reference input current range | IREF | 10 | mA | 3 | |||
| Allowable maximum power dissipation | PD | 770 | mW | SOP-8 package | 3 | ||
| Operating junction temperature | TJ | 150 | ℃ | 3 | |||
| Storage temperature range | TSTG | -65 | 150 | ℃ | 3 | ||
| Lead temperature (soldering) | TLEAD | 260 | ℃ | 10s soldering | 3 | ||
| Operating temperature range | TA | -40 | 85 | ℃ | LM431xI (industrial grade; LM431BI) | 3 |
CAD (KiCad official)
- Symbol:
LM431BIM - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
lm431bim-etched.step/lm431bim-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm431bim.step/lm431bim.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: HGSEMI datasheet (9 pp, sha256
7e234b72ffe30494, retrieved 2026-10-18, 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 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).