component
1SMA4749
Public Made by Adomby adom
amsem Zener Diodes, DO-214AC(SMA). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdown1SMA4749
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1sma4749.step/1sma4749.glbare 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, primaryclaude-sonnet-5-5(text), consensusclaude-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).