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1SMA4742A-MS
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MSKSEMI Zener Diodes, SMA. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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1SMA4742A-MS
MSKSEMI · Zener Diodes · SMA
1SMA4742A-MS from MSKSEMI, 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 | Cathode | passive | Cathode of the zener diode; connects to the positive side in reverse-breakdown regulation (1SMA4742A-MS: 12V nominal zener voltage, 11.4V to 12.6V). |
| 2 | A | passive | Anode of the zener diode; connects to the negative/ground side in reverse-breakdown regulation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | 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 |
|---|---|---|---|---|---|---|---|
| Zener test current | Izt | 21 | mA | 4 | |||
| Dynamic impedance | Zzt | 9 | Ω | 4 | |||
| Reverse leakage current | IR | 5 | µA | 4 | |||
| Reverse voltage for leakage test | VR | 9 | V | 4 | |||
| Last table column (likely max zener current) | 79 | mA | 4 | ||||
| Power dissipation | PD | 1 | W | Tc = 75°C | 3 | ||
| Forward voltage | VF | 1.2 | V | IF = 200 mA | 3 | ||
| Junction temperature range | TJ | -55 | 150 | °C | 3 | ||
| Storage temperature range | TS | -55 | 150 | °C | 3 |
CAD (KiCad official)
- Symbol:
1SMA4742A-MS - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
1sma4742a-ms-etched.step/1sma4742a-ms-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1sma4742a-ms.step/1sma4742a-ms.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: MSKSEMI datasheet (6 pp, sha256
779c5c0d81f9ab38, 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).
# 1SMA4742A-MS
**MSKSEMI** · Zener Diodes · SMA
1SMA4742A-MS from MSKSEMI, 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 | Cathode | passive | Cathode of the zener diode; connects to the positive side in reverse-breakdown regulation (1SMA4742A-MS: 12V nominal zener voltage, 11.4V to 12.6V). |
| 2 | A | passive | Anode of the zener diode; connects to the negative/ground side in reverse-breakdown regulation. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | 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 |
|---|---|---|---|---|---|---|---|
| Zener test current | Izt | | 21 | | mA | | 4 |
| Dynamic impedance | Zzt | | | 9 | Ω | | 4 |
| Reverse leakage current | IR | | | 5 | µA | | 4 |
| Reverse voltage for leakage test | VR | | 9 | | V | | 4 |
| Last table column (likely max zener current) | | | | 79 | mA | | 4 |
| Power dissipation | PD | | | 1 | W | Tc = 75°C | 3 |
| Forward voltage | VF | | | 1.2 | V | IF = 200 mA | 3 |
| Junction temperature range | TJ | -55 | | 150 | °C | | 3 |
| Storage temperature range | TS | -55 | | 150 | °C | | 3 |
## CAD (KiCad official)
- Symbol: `1SMA4742A-MS`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `1sma4742a-ms-etched.step` / `1sma4742a-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4742a-ms.step` / `1sma4742a-ms.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [MSKSEMI datasheet](docs/1sma4742a-ms-datasheet.pdf) (6 pp, sha256 `779c5c0d81f9ab38`, 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](docs/1sma4742a-ms-datasheet.pdf)