component
1SMA4745A
Public Made by Adomby adom
MDD（Microdiode Electronics） Zener Diodes, SMA. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
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1SMA4745A
MDD（Microdiode Electronics） · Zener Diodes · SMA
1SMA4745A from MDD（Microdiode Electronics）, 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | MDD（Microdiode Electronics） |
| 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 voltage (MDD 1SMA4745A, nominal 16 V) | VZT | 15.2 | 16 | 17.1 | V | at IZT (per table header) | 2 |
| Dynamic impedance (MDD 1SMA4745A) | ZZT | 16 | Ω | at IZT (per table header) | 2 | ||
| Peak power dissipation | PD | 1 | W | TA=50 °C, mounted on 5.0 mm² land areas (Note 1) | 1 | ||
| Power derating above 50 °C | PD | 6.67 | mW/°C | derate above 50 °C (Note 1) | 1 | ||
| Operating and storage temperature range | TJ, TSTG | -55 | 150 | °C | 1 | ||
| Forward voltage | VF | 1.2 | V | 1 |
CAD (KiCad official)
- Symbol:
1SMA4745A - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
1sma4745a-etched.step/1sma4745a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1sma4745a.step/1sma4745a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: MDD（Microdiode Electronics） datasheet (5 pp, sha256
b0a657aa72d39a2a, retrieved 2026-10-21, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins, primarycathode-band convention(convention), consensusoff(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).
# 1SMA4745A
**MDD（Microdiode Electronics）** · Zener Diodes · SMA
1SMA4745A from MDD（Microdiode Electronics）, 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | MDD（Microdiode Electronics） |
| 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 voltage (MDD 1SMA4745A, nominal 16 V) | VZT | 15.2 | 16 | 17.1 | V | at IZT (per table header) | 2 |
| Dynamic impedance (MDD 1SMA4745A) | ZZT | | | 16 | Ω | at IZT (per table header) | 2 |
| Peak power dissipation | PD | | | 1 | W | TA=50 °C, mounted on 5.0 mm² land areas (Note 1) | 1 |
| Power derating above 50 °C | PD | | 6.67 | | mW/°C | derate above 50 °C (Note 1) | 1 |
| Operating and storage temperature range | TJ, TSTG | -55 | | 150 | °C | | 1 |
| Forward voltage | VF | | | 1.2 | V | | 1 |
## CAD (KiCad official)
- Symbol: `1SMA4745A`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `1sma4745a-etched.step` / `1sma4745a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4745a.step` / `1sma4745a.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [MDD（Microdiode Electronics） datasheet](docs/1sma4745a-datasheet.pdf) (5 pp, sha256 `b0a657aa72d39a2a`, retrieved 2026-10-21, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/1sma4745a-datasheet.pdf)