SMDJ45A

TWGMC · ESD And Surge Protection (TVS/ESD) · DO-214AB(SMC)

SMDJ45A from TWGMC, in a DO-214AB(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 TVS (SMDJ45A); for bipolar CA parts the datasheet lists the same pin 1 designation.
2	Anode	passive	Anode terminal of the TVS; SMDJ45A has 45.0V stand-off voltage, 50V to 55.3V breakdown at 1mA, and 72.7V max clamping at 41.3A peak pulse current.

Key specifications

Parameter	Value
Manufacturer	TWGMC
Package	DO-214AB(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
Reverse Stand-off Voltage	VRWM		45		V	SMDJ45A	2
Breakdown Voltage	VBR	50		55.3	V	@ IT = 1 mA	2
Max Clamp Voltage	VC			72.7	V	@ IPP = 41.3 A	2
Max Peak Pulse Current	IPP			41.3	A		2
Max Reverse Leakage	IR			2	uA	@ VR	2
Peak Pulse Power Dissipation	PPPM			3000	W	TA=25°C, 10x1000 us waveform	1
Steady State Power Dissipation	PM(AV)			6.5	W	On infinite heat sink at TA=50°C	1
Peak Forward Surge Current	IFSM			300	A	8.3ms single half sine wave, unidirectional only	1
Maximum Instantaneous Forward Voltage	VF			3.5	V	at 100A, unidirectional only	1
Operating Junction and Storage Temperature Range	Tj, TSTG	-65		150	°C		1
Typical Thermal Resistance Junction to Lead	RθJL		15		°C/W		1
Typical Thermal Resistance Junction to Ambient	RθJA		75		°C/W		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		tin	Matte Tin Lead-free Plated Maximum Ratings and Thermal Characteristics (TA=25℃ unless otherwise noted)	1

CAD (KiCad official)

Symbol: SMDJ45A
Footprint: Diode_SMD:D_SMC
3D model: DO-214AB(SMC) (KiCad packages3D, STEP)
3D model files: smdj45a-etched.step / smdj45a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); smdj45a.step / smdj45a.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: TWGMC datasheet (4 pp, sha256 07b07d63a3938379, 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

# SMDJ45A

**TWGMC** · ESD And Surge Protection (TVS/ESD) · DO-214AB(SMC)

SMDJ45A from TWGMC, in a DO-214AB(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 TVS (SMDJ45A); for bipolar CA parts the datasheet lists the same pin 1 designation. |
| 2 | Anode | passive | Anode terminal of the TVS; SMDJ45A has 45.0V stand-off voltage, 50V to 55.3V breakdown at 1mA, and 72.7V max clamping at 41.3A peak pulse current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TWGMC |
| Package | DO-214AB(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 |
|---|---|---|---|---|---|---|---|
| Reverse Stand-off Voltage | VRWM |  | 45 |  | V | SMDJ45A | 2 |
| Breakdown Voltage | VBR | 50 |  | 55.3 | V | @ IT = 1 mA | 2 |
| Max Clamp Voltage | VC |  |  | 72.7 | V | @ IPP = 41.3 A | 2 |
| Max Peak Pulse Current | IPP |  |  | 41.3 | A |  | 2 |
| Max Reverse Leakage | IR |  |  | 2 | uA | @ VR | 2 |
| Peak Pulse Power Dissipation | PPPM |  |  | 3000 | W | TA=25°C, 10x1000 us waveform | 1 |
| Steady State Power Dissipation | PM(AV) |  |  | 6.5 | W | On infinite heat sink at TA=50°C | 1 |
| Peak Forward Surge Current | IFSM |  |  | 300 | A | 8.3ms single half sine wave, unidirectional only | 1 |
| Maximum Instantaneous Forward Voltage | VF |  |  | 3.5 | V | at 100A, unidirectional only | 1 |
| Operating Junction and Storage Temperature Range | Tj, TSTG | -65 |  | 150 | °C |  | 1 |
| Typical Thermal Resistance Junction to Lead | RθJL |  | 15 |  | °C/W |  | 1 |
| Typical Thermal Resistance Junction to Ambient | RθJA |  | 75 |  | °C/W |  | 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 |  | tin | Matte Tin Lead-free Plated Maximum Ratings and Thermal Characteristics (TA=25℃ unless otherwise noted) | 1 |

## CAD (KiCad official)

- Symbol: `SMDJ45A`
- Footprint: `Diode_SMD:D_SMC`
- 3D model: DO-214AB(SMC) (KiCad packages3D, STEP)
- 3D model files: `smdj45a-etched.step` / `smdj45a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smdj45a.step` / `smdj45a.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [TWGMC datasheet](docs/smdj45a-datasheet.pdf) (4 pp, sha256 `07b07d63a3938379`, 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/smdj45a-datasheet.pdf)