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KIA431A-AT

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KEC Semicon Voltage Reference, TO-92-2.54mm. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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KIA431A-AT

KEC Semicon · Voltage Reference · TO-92-2.54mm

KIA431A-AT from KEC Semicon, in a TO-92-2.54mm. 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 that sets the regulated voltage, Vref 2.495 V typ (2.470 to 2.520 V for the KIA431A grade) at IK = 10 mA, with continuous reference input current limited to -0.05 to 10 mA.
2 ANODE passive Anode is the common return terminal for the shunt current, and the cathode-to-anode voltage must not exceed 37 V (absolute maximum).
3 CATHODE passive Cathode is the shunt current terminal, rated for continuous cathode current of -100 to 150 mA and cathode-to-anode voltage up to 37 V.

Key specifications

Parameter Value
Manufacturer KEC Semicon
Package TO-92-2.54mm
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 Input Voltage (KIA431A, ±1.0%) Vref 2.47 2.495 2.52 V VKA=Vref, IK=10mA (Figure 1) 3
Reference Input Voltage Deviation Over Temperature Range (KIA431A; 40 mV applies, 30 mV is PS selection code only) Vref 7 40 mV VKA=Vref, IK=10mA, over full operating temperature range (Note 1) 3
Ratio of Change in Reference Input Voltage to Change in Cathode-Anode Voltage (VKA=10V) Vref/VKA -1.4 -2.7 mV/V IK=10mA, VKA=10V 3
Ratio of Change in Reference Input Voltage to Change in Cathode-Anode Voltage (VKA=36V to 10V) Vref/VKA -1 -2 mV/V IK=10mA, VKA=36V to 10V 3
Reference Input Current at Ta=25 Iref 1.8 4 μA IK=10mA, R1=10k, R2= (Figure 2), Ta=25 3
Reference Input Current over Operating Temperature Range (Ta=Topr) Iref 6.5 μA IK=10mA, R1=10k, R2= (Figure 2), Ta=Topr 3
Reference Input Current Deviation Over Temperature Range Iref 0.8 2.5 μA IK=10mA, R1=10k, R2= (Figure 2), over temperature range 3
Minimum Cathode Current For Regulation Imin 0.5 1 mA VKA=Vref (Figure 1) 3
Off-State Cathode Current Ioff 2.6 1000 nA VKA=36V, Vref=0V (Figure 3) 3
Operating Voltage (KIA431 family, VKA) 2.5 36 V Type table operating voltage range 2.5 ~ 36 V 1
Cathode To Anode Voltage VKA 37 V 3
Cathode Current Range, Continuous IK -100 150 mA 3
Reference Input Current Range, Continuous Iref -0.05 10 mA 3
Operating Junction Temperature Tj 150 °C 3
Operating Temperature Topr -40 85 °C 3
Storage Temperature Tstg -65 150 °C 3
Total Power Dissipation (KIA431, TO-92) PD 700 mW 3
Thermal Resistance Junction-to-Ambient (KIA431, TO-92) Rth(j-a) 179 ℃/W 3
Dynamic Impedance Zka 0.22 Ω VKA=Vref, IK=1.0 to 100mA, f=1.0kHz (Figure 1, Note 2) 3

CAD (KiCad official)

  • Symbol: KIA431A-AT
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92-2.54mm (KiCad packages3D, STEP)
  • 3D model files: kia431a-at-etched.step / kia431a-at-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); kia431a-at.step / kia431a-at.glb are the bare package body.

Provenance

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

  • Datasheet: KEC Semicon datasheet (7 pp, sha256 8eafef7a8a3f5a44, 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