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SGM431BXN3LG
Public Made by Adomby adom
SGMICRO 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
markdownSGM431BXN3LG
SGMICRO · Voltage Reference · SOT-23
SGM431BXN3LG from SGMICRO, 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 | Cathode pin: voltage input that shunts current, operating over VREF to 36V with cathode current of 1mA to 100mA. |
| 2 | REF | input | REF input pin whose threshold is related to the ANODE pin voltage; for SGM431B the reference voltage is 2.488V to 2.512V (2.500V typ) at IKA = 10mA. |
| 3 | ANODE | power_in | Anode pin, connected to ground normally; all voltage values are referenced to ANODE. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | SGMICRO |
| 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 | 2.488 | 2.5 | 2.512 | V | VKA = VREF, IKA = 10mA | 6 |
| Deviation of Reference Input Voltage over Full Temperature Range | VI(DEV) | 5 | 25 | mV | VKA = VREF, IKA = 10mA | 6 | |
| Ratio of Change in Reference Voltage to Change in Cathode Voltage (ΔVKA = 10V - VREF) | ΔVREF/ΔVKA | -0.5 | -1 | mV/V | IKA = 10mA, ΔVKA = 10V - VREF | 6 | |
| Ratio of Change in Reference Voltage to Change in Cathode Voltage (ΔVKA = 36V - 10V) | ΔVREF/ΔVKA | 0.1 | 0.5 | mV/V | IKA = 10mA, ΔVKA = 36V - 10V | 6 | |
| Reference Input Current | IREF | 1 | 2 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 6 | |
| Deviation of Reference Input Current over Full Temperature Range | II(DEV) | 0.4 | 0.8 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 6 | |
| Minimum Cathode Current for Regulation | IMIN | 0.4 | 0.7 | mA | VKA = VREF | 6 | |
| Off-State Cathode Current | IOFF | 0.1 | 1 | µA | VKA = 36V, VREF = 0 | 6 | |
| Dynamic Impedance | /ZKA/ | 0.1 | 0.5 | Ω | VKA = VREF, f ≤ 1kHz, IKA = 1mA to 100mA | 6 | |
| Cathode Voltage | VKA | 40 | V | Voltages with respect to ANODE | 3 | ||
| Junction Temperature | TJ | 150 | ℃ | 3 | |||
| Storage Temperature Range | TSTG | -65 | 150 | ℃ | 3 | ||
| Lead Temperature (Soldering) | 260 | ℃ | Soldering, 10s | 3 | |||
| Cathode Voltage (recommended) | VKA | 36 | V | Lower limit printed as VREF | 3 | ||
| Cathode Current | IKA | 1 | 100 | mA | 3 | ||
| Operating Junction Temperature Range | TJ | -40 | 125 | ℃ | 3 | ||
| Package Thermal Resistance, SOT-23 junction-to-ambient | θJA | 245 | ℃/W | SOT-23 package | 3 |
CAD (KiCad official)
- Symbol:
SGM431BXN3LG - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
sgm431bxn3lg-etched.step/sgm431bxn3lg-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sgm431bxn3lg.step/sgm431bxn3lg.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: SGMICRO datasheet (18 pp, sha256
819bc2bf24004ab9, 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).