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1SMA4740A SMA

Public Made by Adom

by adom

XCH(旭昌辉) , SMA. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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1SMA4740A SMA

XCH(旭昌辉) · IC · SMA

1SMA4740A SMA from XCH(旭昌辉), in a 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 of the zener diode; operated at positive voltage versus the anode in reverse (zener) regulation, with the 1SMA4740A at 10 V nominal VZ (9.50 V min to 10.5 V max) at IZT = 25 mA, and 1 W maximum total power dissipation.
2 A passive Anode of the zener diode; forward voltage is max 1.2 V at IF = 200 mA, with junction and storage temperature range of -55 to +150 °C.

Key specifications

Parameter Value
Manufacturer XCH(旭昌辉)
Package SMA
Category
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
Zener voltage (1SMA4740A, nominal 10 V) VZT 9.5 10 10.5 V at IZT (test current 25 mA); VZT tested with pulses (20 ms) 2
Dynamic impedance ZZT 7 Ω at IZT = 25 mA 2
Admissible Zener current IZM 95 mA 2
Power dissipation PD 1 W Tc = 75 °C (series rating, 1SMA4728A thru 1SMA4777A) 1
Forward voltage VF 1.2 V IF = 200 mA 1
Junction temperature range TJ -55 150 °C 1
Storage temperature range TS -55 150 °C 1

CAD (KiCad official)

  • Symbol: 1SMA4740A SMA
  • Footprint: Diode_SMD:D_SMA
  • 3D model: SMA (KiCad packages3D, STEP)
  • 3D model files: 1sma4740a-sma-etched.step / 1sma4740a-sma-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 1sma4740a-sma.step / 1sma4740a-sma.glb are the bare package body.

Provenance

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

  • Datasheet: XCH(旭昌辉) datasheet (3 pp, sha256 8898909dec2ee3ad, retrieved 2026-10-17, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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