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1SMA4742H

Public Made by Adom

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Taiwan Semiconductor Zener Diodes, DO-214AC(SMA). Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.

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1SMA4742H

Taiwan Semiconductor · Zener Diodes · DO-214AC(SMA)

1SMA4742H from Taiwan Semiconductor, in a DO-214AC(SMA). 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 K passive Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint.
2 A passive Anode.

Key specifications

Parameter Value
Manufacturer Taiwan Semiconductor
Package DO-214AC(SMA)
Category Diodes
Pins 2

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Power dissipation (RθJA < 76.8 K/W, TA = 25°C) PD 1 W RθJA<76.8 K/W, TA = 25°C 1
Power dissipation (RθJA < 76.8 K/W, TA = 60°C) PD 1.25 W RθJA<76.8 K/W, TA = 60°C 1
Non repetitive peak power dissipation PZSM 60 W Note 1: tp = 100μs sq. pulse, TA = 25°C prior to surge 1
Peak forward surge current IFSM 30 A 8.3ms single half sine-wave superimposed on rated load 1
Junction temperature TJ -55 175 °C 1
Storage temperature TSTG -55 175 °C 1
Surge current, non-repetitive (1SMA4742H) IR 380 mA Maximum peak non-repetitive reverse surge current of 1/2 square wave or equivalent sine pulse of 1/120 s superimposed on IZT (Note 5); column labeled Max 2
Standard tolerance on nominal zener voltage VZ -5 5 % Standard tolerance for listed type numbers (Note 1); tighter tolerances available as specials (Note 2) 2
Nominal zener voltage VZ 12 V @ IZ = IZT (test current 21 mA) 2
Test current IZT 21 mA Test current for VZ 2
Zener impedance ZZT 9 Ω @ IZT; 60 cycle AC, rms 10% of IZT superimposed (Note 4) 2
Zener impedance at knee current ZZK 700 Ω @ IZK; 60 cycle AC, rms 10% of IZK superimposed (Note 4) 2
Knee test current IZK 0.25 mA Test current for ZZK 2
Leakage current IR 1 µA @ VR = 9.1 V 2
Reverse voltage for leakage current VR 9.1 V Test voltage for IR 2

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts tin ● Terminal: Matte tin plated leads, solderable per J-STD-002 ● Meet JESD 201 class 2 whisker test 1

CAD (KiCad official)

  • Symbol: 1SMA4742H
  • Footprint: Diode_SMD:D_SMA
  • 3D model: DO-214AC(SMA) (KiCad packages3D, STEP)
  • 3D model files: 1sma4742h-etched.step / 1sma4742h-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 1sma4742h.step / 1sma4742h.glb are the bare package body.

Provenance

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

  • Datasheet: Taiwan Semiconductor datasheet (8 pp, sha256 699464ee49a50c3e, retrieved 2026-10-21, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins, primary cathode-band convention (convention), consensus off (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