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SM4F9.0AQ
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Yangzhou Yangjie Elec Tech ESD And Surge Protection (TVS/ESD), SOD-123. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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SM4F9.0AQ
Yangzhou Yangjie Elec Tech · ESD And Surge Protection (TVS/ESD) · SOD-123
SM4F9.0AQ from Yangzhou Yangjie Elec Tech, in a SOD-123. 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 end marked with the band on the unidirectional SM4F9.0AQ; connects to the protected line, with 9.0 V working peak reverse voltage (VRWM) and 10.00 to 11.10 V breakdown at 1 mA. |
| 2 | A | passive | Anode, the unbanded end of the unidirectional SM4F9.0AQ; connects to ground or the return, with maximum clamping voltage 15.4 V at 26.0 A peak pulse current. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | SOD-123 |
| Category | Circuit Protection |
| 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 |
|---|---|---|---|---|---|---|---|
| Breakdown voltage (unidirectional), minimum | VBR | 10 | V | IT = 1 mA, pulse test tp≤50 ms | 2 | ||
| Breakdown voltage (unidirectional), maximum | VBR | 11.1 | V | IT = 1 mA, pulse test tp≤50 ms | 2 | ||
| Maximum reverse leakage current | IR | 5 | μA | @ VRWM = 9.0 V | 2 | ||
| Maximum reverse surge current | IPP | 26 | A | Surge current waveform per Fig. 2 and derated per Fig. 3 (Note 2) | 2 | ||
| Maximum clamping voltage | VC | 15.4 | V | @ IPP = 26.0 A | 2 | ||
| Working peak reverse voltage | VRWM | 9 | V | Stand-off (working) voltage for SM4F9.0AQ | 2 | ||
| Peak power dissipation | PPPM | 400 | W | with a 10/1000 μs waveform (Notes 1, 2) | 1 | ||
| Power dissipation, on infinite heat sink | PD | 1 | W | TA = 25℃ | 1 | ||
| Peak forward surge current, 8.3 ms single | IFSM | 30 | A | 8.3 ms single half sine-wave (Note 3) | 1 | ||
| Operating junction temperature range | TJ | -55 | 175 | ℃ | - | 1 | |
| Storage temperature range | TSTG | -55 | 175 | ℃ | - | 1 | |
| Thermal resistance, junction to lead | RθJL | 30 | ℃/W | Between junction and lead | 1 | ||
| Thermal resistance, junction to ambient | RθJA | 150 | ℃/W | Between junction and ambient | 1 | ||
| Thermal resistance, junction to case | RθJC | 50 | ℃/W | Between junction and curve (as printed) | 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 |
|---|---|---|---|---|
| housing | black | 4. Body color: Black | 4 | |
| contacts | tin | ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |
CAD (KiCad official)
- Symbol:
SM4F9.0AQ - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
sm4f9-0aq-etched.step/sm4f9-0aq-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sm4f9-0aq.step/sm4f9-0aq.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Yangzhou Yangjie Elec Tech datasheet (5 pp, sha256
b6813d5ab557d38f, retrieved 2026-10-18, 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).
# SM4F9.0AQ
**Yangzhou Yangjie Elec Tech** · ESD And Surge Protection (TVS/ESD) · SOD-123
SM4F9.0AQ from Yangzhou Yangjie Elec Tech, in a SOD-123. 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 end marked with the band on the unidirectional SM4F9.0AQ; connects to the protected line, with 9.0 V working peak reverse voltage (VRWM) and 10.00 to 11.10 V breakdown at 1 mA. |
| 2 | A | passive | Anode, the unbanded end of the unidirectional SM4F9.0AQ; connects to ground or the return, with maximum clamping voltage 15.4 V at 26.0 A peak pulse current. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | SOD-123 |
| Category | Circuit Protection |
| 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 |
|---|---|---|---|---|---|---|---|
| Breakdown voltage (unidirectional), minimum | VBR | 10 | | | V | IT = 1 mA, pulse test tp≤50 ms | 2 |
| Breakdown voltage (unidirectional), maximum | VBR | | | 11.1 | V | IT = 1 mA, pulse test tp≤50 ms | 2 |
| Maximum reverse leakage current | IR | | | 5 | μA | @ VRWM = 9.0 V | 2 |
| Maximum reverse surge current | IPP | | | 26 | A | Surge current waveform per Fig. 2 and derated per Fig. 3 (Note 2) | 2 |
| Maximum clamping voltage | VC | | | 15.4 | V | @ IPP = 26.0 A | 2 |
| Working peak reverse voltage | VRWM | | | 9 | V | Stand-off (working) voltage for SM4F9.0AQ | 2 |
| Peak power dissipation | PPPM | | | 400 | W | with a 10/1000 μs waveform (Notes 1, 2) | 1 |
| Power dissipation, on infinite heat sink | PD | | | 1 | W | TA = 25℃ | 1 |
| Peak forward surge current, 8.3 ms single | IFSM | | | 30 | A | 8.3 ms single half sine-wave (Note 3) | 1 |
| Operating junction temperature range | TJ | -55 | | 175 | ℃ | - | 1 |
| Storage temperature range | TSTG | -55 | | 175 | ℃ | - | 1 |
| Thermal resistance, junction to lead | RθJL | | | 30 | ℃/W | Between junction and lead | 1 |
| Thermal resistance, junction to ambient | RθJA | | | 150 | ℃/W | Between junction and ambient | 1 |
| Thermal resistance, junction to case | RθJC | | | 50 | ℃/W | Between junction and curve (as printed) | 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 |
|---|---|---|---|---|
| housing | | black | 4. Body color: Black | 4 |
| contacts | | tin | ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |
## CAD (KiCad official)
- Symbol: `SM4F9.0AQ`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `sm4f9-0aq-etched.step` / `sm4f9-0aq-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sm4f9-0aq.step` / `sm4f9-0aq.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](docs/sm4f9-0aq-datasheet.pdf) (5 pp, sha256 `b6813d5ab557d38f`, retrieved 2026-10-18, 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/sm4f9-0aq-datasheet.pdf)