component
1SMA4729A SMA
Public Made by Adomby adom
XCH(旭昌辉) , SMA. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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1SMA4729A SMA
XCH(旭昌辉) · IC · SMA
1SMA4729A 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 terminal of the zener diode, at the banded end of the SMA body in the page 1 picture; the zener is operated reverse-biased with this pin positive, and power dissipation is max 1 W at Tc=75°C. |
| 2 | A | passive | Anode terminal of the zener diode, at the unbanded end of the 2-lead SMA package; forward voltage is 1.2 V at IF = 200 mA. |
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 (nominal 3.6 V) | VZT | 3.4 | 3.6 | 3.8 | V | at IZT 69 mA; VZT tested with pulses (20 ms) | 2 |
| Dynamic impedance | ZZT | 10 | Ω | at IZT 69 mA | 2 | ||
| Reverse current | IR | 100 | µA | at VR 1 V | 2 | ||
| Forward voltage | VF | 1.2 | V | at IF = 200 mA | 1 | ||
| Power dissipation | PD | 1 | W | at Tc = 75°C | 1 | ||
| Junction temperature range | TJ | -55 | 150 | °C | 1 | ||
| Storage temperature range | TS | -55 | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
1SMA4729A SMA - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
1sma4729a-sma-etched.step/1sma4729a-sma-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1sma4729a-sma.step/1sma4729a-sma.glbare 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).
# 1SMA4729A SMA
**XCH(旭昌辉)** · IC · SMA
1SMA4729A 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 terminal of the zener diode, at the banded end of the SMA body in the page 1 picture; the zener is operated reverse-biased with this pin positive, and power dissipation is max 1 W at Tc=75°C. |
| 2 | A | passive | Anode terminal of the zener diode, at the unbanded end of the 2-lead SMA package; forward voltage is 1.2 V at IF = 200 mA. |
## 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 (nominal 3.6 V) | VZT | 3.4 | 3.6 | 3.8 | V | at IZT 69 mA; VZT tested with pulses (20 ms) | 2 |
| Dynamic impedance | ZZT | | | 10 | Ω | at IZT 69 mA | 2 |
| Reverse current | IR | | | 100 | µA | at VR 1 V | 2 |
| Forward voltage | VF | | | 1.2 | V | at IF = 200 mA | 1 |
| Power dissipation | PD | | | 1 | W | at Tc = 75°C | 1 |
| Junction temperature range | TJ | -55 | | 150 | °C | | 1 |
| Storage temperature range | TS | -55 | | 150 | °C | | 1 |
## CAD (KiCad official)
- Symbol: `1SMA4729A SMA`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `1sma4729a-sma-etched.step` / `1sma4729a-sma-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4729a-sma.step` / `1sma4729a-sma.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [XCH(旭昌辉) datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603132589926731776) (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](docs/1sma4729a-sma-datasheet.pdf)