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LM431BCZX

Public Made by Adom

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onsemi Voltage References, TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM431BCZX

onsemi · Voltage References · TO-92

LM431BCZX from onsemi, in a TO-92. 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 REF input Reference input that sets the cathode voltage from VREF (approximately 2.5 V) up to 36 V via an external divider, with reference input current of 1.5 µA typ and 4.0 µA max.
2 ANODE power_in Anode, the common/ground-side terminal of the shunt regulator, which carries the cathode current of 1.0 to 100 mA.
3 CATHODE passive Cathode, the regulated output terminal, which operates from VREF to 36 V (37 V absolute maximum) and sinks 1.0 to 100 mA.

Key specifications

Parameter Value
Manufacturer onsemi
Package TO-92
Category Power Management ICs
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 VREF 2.47 2.495 2.52 V VKA = VREF, IKA = 10 mA, TA = 25°C 2
Deviation of Reference Input Voltage Over Temperature ΔVREF/ΔT 4.5 17 mV VKA = VREF, IKA = 10 mA, TMIN ≤ TA ≤ TMAX 2
Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (VKA = 10 V − VREF) ΔVREF/ΔVKA -1 -2.7 mV/V IKA = 10 mA, VKA = 10 V − VREF 2
Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (VKA = 36 V − 10 V) ΔVREF/ΔVKA -0.5 -2 mV/V IKA = 10 mA, VKA = 36 V − 10 V 2
Reference Input Current IREF 1.5 4 µA IKA = 10 mA, R1 = 10 k, R2 = ∞ 2
Deviation of Reference Input Current Over Full Temperature Range ΔIREF/ΔT 0.4 1.2 µA IKA = 10 mA, R1 = 10 k, R2 = ∞, TA = Full Range 2
Minimum Cathode Current for Regulation IKA(MIN) 0.45 1 mA VKA = VREF 2
Off-State Cathode Current IKA(OFF) 0.05 1 µA VKA = 36 V, VREF = 0 2
Dynamic Impedance ZKA 0.15 0.5 Ω VKA = VREF, IKA = 1 to 100 mA, f ≥ 1.0 kHz 2
Cathode Voltage VKA 37 V 2
Cathode Current Range (Continuous) IKA -100 150 mA 2
Reference Input Current Range IREF -0.05 10 mA 2
Power Dissipation PD 770 mW 2
Operating Temperature Range - LM431xC TOPR -25 85 °C LM431xC 2
Junction Temperature TJ 150 °C 2
Storage Temperature Range TSTG -65 150 °C 2
Cathode Voltage VKA 36 V Min printed as VREF 2
Cathode Current IKA 1 100 mA 2
Thermal Resistance, Junction to Ambient RθjA 160 °C/W 2
Output Voltage Tolerance -1 1 % LM431BCZX ordering table: 1% 6
Equivalent Full-Range Temperature Coefficient 50 ppm/°C 1

CAD (KiCad official)

  • Symbol: LM431BCZX
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92 (KiCad packages3D, STEP)
  • 3D model files: lm431bczx-etched.step / lm431bczx-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm431bczx.step / lm431bczx.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (9 pp, sha256 57e85c256a1a8451, retrieved 2026-10-23, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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