component

1SMA4749

Public Made by Adom

by adom

amsem Zener Diodes, DO-214AC(SMA). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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1SMA4749

amsem · Zener Diodes · DO-214AC(SMA)

1SMA4749 from amsem, 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 (positive end of the zener), marked by the color band on the package; 1SMA4749 has a nominal Vz of 24 V at IZT = 10.5 mA.
2 A passive Anode terminal of the zener diode, the end opposite the color band; VF is 1.2 V max at IF = 200 mA.

Key specifications

Parameter Value
Manufacturer amsem
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
Peak Power Dissipation PD 1 W TA=50°C, mounted on 5.0mm2 land areas 1
Power Derating above 50°C PD 6.67 mW/°C Derate above 50°C 1
Peak Forward Surge Current IFSM 10 A 8.3 ms single half sine-wave superimposed on rated load (JEDEC method) 1
Operating and Storage Temperature Range TJ, TSTG -55 150 °C 1
Forward Voltage VF 1.2 V IF=200mA, TA=25°C 2
Maximum Zener Impedance ZZT 25 Ohms @ IZT 2
Maximum Zener Impedance (knee) ZZK 750 Ohms @ IZK = 0.25 mA 2
Reverse Leakage Current IR 5 uA @ VR = 18.2 V 2
Surge Current Ir 190 mA TA=25°C 2
Nominal Zener Voltage Vz 24 V @ IZT = 10.5 mA 2
Zener Test Current IZT 10.5 mA Test current 2
Zener Voltage Tolerance -10 10 % Standard tolerance; suffix A gives 5% 1

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  Terminals: Pure tin plated lead free, solderable per MIL-STD-750, Method 2025 1

CAD (KiCad official)

  • Symbol: 1SMA4749
  • Footprint: Diode_SMD:D_SMA
  • 3D model: DO-214AC(SMA) (KiCad packages3D, STEP)
  • 3D model files: 1sma4749-etched.step / 1sma4749-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 1sma4749.step / 1sma4749.glb are the bare package body.

Provenance

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

  • Datasheet: amsem datasheet (5 pp, sha256 641fed809a9c0149, retrieved 2026-10-22, tier: lcsc)
  • 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