component
SMCJ188A
Public Made by Adomby adom
UMW TVS, SMC. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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SMCJ188A
UMW · TVS · SMC
SMCJ188A from UMW, in a SMC. 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 terminal of the unidirectional SMCJ188A TVS diode, marked by the color band on the case; VWM 188V, VBR 209V min to 231V max, VC 328V at IPPM 4.60A. |
| 2 | Anode | passive | Anode terminal of the unidirectional SMCJ188A TVS diode, the end opposite the color band, with 1500W peak pulse power (10/1000µs) capability. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| Package | SMC |
| 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 (min) | VBR | 209 | 231 | V | at IT = 1.0 mA | 3 | |
| Test Current | IT | 1 | mA | 3 | |||
| Working Peak Reverse Voltage | VWM | 188 | V | 3 | |||
| Maximum Reverse Leakage | IR | 5 | µA | at VWM | 3 | ||
| Maximum Peak Pulse Surge Current | IPPM | 4.6 | A | 3 | |||
| Maximum Clamping Voltage | VC | 328 | V | at IPPM | 3 | ||
| Peak Pulse Power Dissipation | PPPM | 1500 | W | Minimum 1500; non-repetitive, 1ms | 1 | ||
| Peak Forward Surge Current | IFSM | 200 | A | per Fig. 5 | 1 | ||
| Maximum Instantaneous Forward Voltage | VF | 3.5 | V | at 50.0A, unidirectional only | 1 | ||
| Junction and Storage Temperature Range | TJ,TSTG | -55 | 150 | °C | 1 | ||
| Thermal Resistance, Junction to Ambient | RθJA | 75 | °C/W | Mounted on minimum recommended pad layout | 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 |
|---|---|---|---|---|
| contacts | copper | (2) Mounted on 0.31 x 0.31” (8.0 x 8.0mm) copper pads to each terminal. | 1 |
CAD (KiCad official)
- Symbol:
SMCJ188A - Footprint:
Diode_SMD:D_SMC - 3D model: SMC (KiCad packages3D, STEP)
- 3D model files:
smcj188a-etched.step/smcj188a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smcj188a.step/smcj188a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UMW datasheet (7 pp, sha256
887bcda70cdf8617, 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).
# SMCJ188A
**UMW** · TVS · SMC
SMCJ188A from UMW, in a SMC. 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 terminal of the unidirectional SMCJ188A TVS diode, marked by the color band on the case; VWM 188V, VBR 209V min to 231V max, VC 328V at IPPM 4.60A. |
| 2 | Anode | passive | Anode terminal of the unidirectional SMCJ188A TVS diode, the end opposite the color band, with 1500W peak pulse power (10/1000µs) capability. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| Package | SMC |
| 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 (min) | VBR | 209 | | 231 | V | at IT = 1.0 mA | 3 |
| Test Current | IT | | 1 | | mA | | 3 |
| Working Peak Reverse Voltage | VWM | | 188 | | V | | 3 |
| Maximum Reverse Leakage | IR | | | 5 | µA | at VWM | 3 |
| Maximum Peak Pulse Surge Current | IPPM | | | 4.6 | A | | 3 |
| Maximum Clamping Voltage | VC | | | 328 | V | at IPPM | 3 |
| Peak Pulse Power Dissipation | PPPM | 1500 | | | W | Minimum 1500; non-repetitive, 1ms | 1 |
| Peak Forward Surge Current | IFSM | | | 200 | A | per Fig. 5 | 1 |
| Maximum Instantaneous Forward Voltage | VF | | | 3.5 | V | at 50.0A, unidirectional only | 1 |
| Junction and Storage Temperature Range | TJ,TSTG | -55 | | 150 | °C | | 1 |
| Thermal Resistance, Junction to Ambient | RθJA | | 75 | | °C/W | Mounted on minimum recommended pad layout | 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 |
|---|---|---|---|---|
| contacts | copper | | (2) Mounted on 0.31 x 0.31” (8.0 x 8.0mm) copper pads to each terminal. | 1 |
## CAD (KiCad official)
- Symbol: `SMCJ188A`
- Footprint: `Diode_SMD:D_SMC`
- 3D model: SMC (KiCad packages3D, STEP)
- 3D model files: `smcj188a-etched.step` / `smcj188a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smcj188a.step` / `smcj188a.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [UMW datasheet](docs/smcj188a-datasheet.pdf) (7 pp, sha256 `887bcda70cdf8617`, 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/smcj188a-datasheet.pdf)