component
SMA4728A
Public Made by Adomby adom
DOWO 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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SMA4728A
DOWO · Zener Diodes · SMA
SMA4728A from DOWO, 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 | DOWO |
| 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 tolerance | -5 | 5 | % | Standard tolerance on nominal zener voltage (note 1) | 3 | ||
| Maximum zener impedance | ZZT | 10 | Ω | @ IZT = 76.0 mA | 3 | ||
| Maximum zener impedance (knee) | ZZK | 400 | Ω | @ IZK = 1.00 mA | 3 | ||
| Maximum reverse leakage current | IR | 100 | µA | @ VR = 1.0 V | 3 | ||
| Maximum DC zener current | IZM | 274 | mA | 3 | |||
| Maximum surge current | IRM | 1370 | mApk | Non-repetitive 8.3 ms pulse, superimposed on IZT per JEDEC (note 2) | 3 | ||
| Maximum forward voltage | VF | 1.2 | V | @ IF = 200 mA | 1 | ||
| DC power dissipation | PD | 1 | W | @ TL = 75 °C | 1 | ||
| Nominal zener voltage | VZ | 3.3 | V | @ IZT = 76.0 mA | 3 | ||
| Maximum thermal resistance junction to ambient air | RӨJA | 170 | °C/W | 1 | |||
| Junction temperature range | TJ | -55 | 175 | °C | 1 | ||
| Storage temperature range | TSTG | -55 | 175 | °C | 1 |
CAD (KiCad official)
- Symbol:
SMA4728A - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
sma4728a-etched.step/sma4728a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sma4728a.step/sma4728a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: DOWO datasheet (3 pp, sha256
60d5fa08a3e8d73c, 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).
# SMA4728A
**DOWO** · Zener Diodes · SMA
SMA4728A from DOWO, 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 | DOWO |
| 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 tolerance | | -5 | | 5 | % | Standard tolerance on nominal zener voltage (note 1) | 3 |
| Maximum zener impedance | ZZT | | | 10 | Ω | @ IZT = 76.0 mA | 3 |
| Maximum zener impedance (knee) | ZZK | | | 400 | Ω | @ IZK = 1.00 mA | 3 |
| Maximum reverse leakage current | IR | | | 100 | µA | @ VR = 1.0 V | 3 |
| Maximum DC zener current | IZM | | | 274 | mA | | 3 |
| Maximum surge current | IRM | | | 1370 | mApk | Non-repetitive 8.3 ms pulse, superimposed on IZT per JEDEC (note 2) | 3 |
| Maximum forward voltage | VF | | | 1.2 | V | @ IF = 200 mA | 1 |
| DC power dissipation | PD | | | 1 | W | @ TL = 75 °C | 1 |
| Nominal zener voltage | VZ | | 3.3 | | V | @ IZT = 76.0 mA | 3 |
| Maximum thermal resistance junction to ambient air | RӨJA | | | 170 | °C/W | | 1 |
| Junction temperature range | TJ | -55 | | 175 | °C | | 1 |
| Storage temperature range | TSTG | -55 | | 175 | °C | | 1 |
## CAD (KiCad official)
- Symbol: `SMA4728A`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `sma4728a-etched.step` / `sma4728a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sma4728a.step` / `sma4728a.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [DOWO datasheet](docs/sma4728a-datasheet.pdf) (3 pp, sha256 `60d5fa08a3e8d73c`, 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/sma4728a-datasheet.pdf)