component

MMBT431LT1

Public Made by Adom

by adom

ALJ Voltage Reference, SOT-89. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentpower management (pmic)mmbt431lt1factory-2.0.0extractor-text
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Contents

README

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MMBT431LT1

ALJ · Voltage Reference · SOT-89

MMBT431LT1 from ALJ, in a SOT-89. 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 of the adjustable shunt regulator, where Vref is 2.445 to 2.545 V (typ. 2.495 V) at IKA = 10 mA, and Iref is rated 0.05 to 10 mA.
2 ANODE passive Common anode terminal of the shunt regulator, which must carry at least IKA(min) = 0.3 mA for regulation, with the absolute cathode-to-anode limits given in the ratings table.
3 CATHODE passive Cathode terminal whose voltage can be adjusted up to 36 V, with absolute maximum VKA of 37 V and continuous cathode current range of -100 to +150 mA.

Key specifications

Parameter Value
Manufacturer ALJ
Package SOT-89
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
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 500 mW 1
Thermal Resistance from Junction to Ambient RθJA 250 °C/W 1
Operating Junction Temperature Tj 150 °C 1
Operating Ambient Temperature Range Topr -40 125 °C 1
Storage temperature Range Tstg -65 150 °C 1
Reference input voltage Vref 2.445 2.495 2.545 V VKA=VREF, IKA=10mA 2
Deviation of reference input voltage over temperature △Vref /△T 4.5 17 mV VKA=VREF, IKA=10mA, Tmin≤Ta≤Tmax 2
Ratio of change in reference input voltage to 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 change in cathode voltage △Vref /△VKA -0.5 -2 mV/V IKA=10mA, △VKA=36V~10V 2
Reference input current lref 1.5 4 μA IKA=10mA, R1=10kΩ, R2=∞ 2
Deviation of reference input current over full temperature range △lref /△T 0.4 1.2 μA lKA=10mA, R1=10kΩ, R2=∞, Ta=full Temperature 2
Minimum cathode current for regulation IKA(min) 0.3 mA VKA=VREF 2
Off-state cathode Current IKA(OFF) 0.05 0.2 μA VKA=36V, VREF=0 2
Dynamic impedance ZKA 0.15 0.5 Ω VKA=VREF, f≤1.0kHz, IKA=1 to 100mA 2

CAD (KiCad official)

  • Symbol: MMBT431LT1
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89 (KiCad packages3D, STEP)
  • 3D model files: mmbt431lt1-etched.step / mmbt431lt1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmbt431lt1.step / mmbt431lt1.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: ALJ datasheet (4 pp, sha256 2ebed224d662b431, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF