TPSMD28A

Littelfuse · TVS · DO-214AB(SMCJ)

TPSMD28A from Littelfuse, in a DO-214AB(SMCJ). 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 (positive end) of the unidirectional TVS, marked by the color band; the TPSMD28A has a 28.0V reverse standoff voltage, 31.10-34.40V breakdown at 1mA, and 45.4V maximum clamping at 66.1A.
2	Anode	passive	Anode of the unidirectional TVS, opposite the cathode band end; forward voltage is at most 3.5V at 100A.

Key specifications

Parameter	Value
Manufacturer	Littelfuse
Package	DO-214AB(SMCJ)
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	VR		28		V		2
Breakdown Voltage	VBR	31.1		34.4	V	@ IT = 1 mA	2
Test Current	IT		1		mA		2
Maximum Clamping Voltage	VC			45.4	V	@ Ipp = 66.1 A	2
Maximum Peak Pulse Current	Ipp			66.1	A		2
Maximum Reverse Leakage	IR			2	µA	@ VR	2
Maximum Instantaneous Forward Voltage	VF			3.5	V	at 100A for Unidirectional Only	1
Peak Pulse Power Dissipation	PPPM			3000	W	10/1000µs waveform, TA=25°C	1
Power Dissipation on Infinite Heat Sink	PM(AV)			6.5	W	TA=50°C	1
Peak Forward Surge Current	IFSM			300	A	8.3ms single half sine wave, 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	copper		2. Mounted on copper pad area of 0.31x0.31” (8.0 x 8.0mm) to each terminal.	1

CAD (KiCad official)

Symbol: TPSMD28A
Footprint: Diode_SMD:D_SMC
3D model: DO-214AB(SMCJ) (KiCad packages3D, STEP)
3D model files: tpsmd28a-etched.step / tpsmd28a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tpsmd28a.step / tpsmd28a.glb are the bare package body.

Provenance

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

Datasheet: Littelfuse datasheet (6 pp, sha256 778e34f01000b1a4, retrieved 2026-10-27, 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

# TPSMD28A

**Littelfuse** · TVS · DO-214AB(SMCJ)

TPSMD28A from Littelfuse, in a DO-214AB(SMCJ). 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 (positive end) of the unidirectional TVS, marked by the color band; the TPSMD28A has a 28.0V reverse standoff voltage, 31.10-34.40V breakdown at 1mA, and 45.4V maximum clamping at 66.1A. |
| 2 | Anode | passive | Anode of the unidirectional TVS, opposite the cathode band end; forward voltage is at most 3.5V at 100A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | DO-214AB(SMCJ) |
| 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 | VR |  | 28 |  | V |  | 2 |
| Breakdown Voltage | VBR | 31.1 |  | 34.4 | V | @ IT = 1 mA | 2 |
| Test Current | IT |  | 1 |  | mA |  | 2 |
| Maximum Clamping Voltage | VC |  |  | 45.4 | V | @ Ipp = 66.1 A | 2 |
| Maximum Peak Pulse Current | Ipp |  |  | 66.1 | A |  | 2 |
| Maximum Reverse Leakage | IR |  |  | 2 | µA | @ VR | 2 |
| Maximum Instantaneous Forward Voltage | VF |  |  | 3.5 | V | at 100A for Unidirectional Only | 1 |
| Peak Pulse Power Dissipation | PPPM |  |  | 3000 | W | 10/1000µs waveform, TA=25°C | 1 |
| Power Dissipation on Infinite Heat Sink | PM(AV) |  |  | 6.5 | W | TA=50°C | 1 |
| Peak Forward Surge Current | IFSM |  |  | 300 | A | 8.3ms single half sine wave, 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 | copper |  | 2. Mounted on copper pad area of 0.31x0.31” (8.0 x 8.0mm) to each terminal. | 1 |

## CAD (KiCad official)

- Symbol: `TPSMD28A`
- Footprint: `Diode_SMD:D_SMC`
- 3D model: DO-214AB(SMCJ) (KiCad packages3D, STEP)
- 3D model files: `tpsmd28a-etched.step` / `tpsmd28a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tpsmd28a.step` / `tpsmd28a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Littelfuse datasheet](docs/tpsmd28a-datasheet.pdf) (6 pp, sha256 `778e34f01000b1a4`, retrieved 2026-10-27, 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/tpsmd28a-datasheet.pdf)