SMA6J18A-Q

BOURNS · TVS · SMA(DO-214AC)

SMA6J18A-Q from BOURNS, in a SMA(DO-214AC). 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 terminal, marked by the cathode band on this unidirectional device; connect to the protected line, which has a working peak reverse voltage of 18 V and a breakdown voltage of 20.0 to 22.1 V at 1.0 mA, clamping at a maximum of 29.2 V at 20.6 A.
2	A	passive	Anode terminal at the end opposite the cathode band, normally connected to ground; the device handles 600 W peak pulse power (TP = 1 ms).

Key specifications

Parameter	Value
Manufacturer	BOURNS
Package	SMA(DO-214AC)
Category	TVS/Fuse/Board Level 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	VBR	20		22.1	V	@ IT = 1.0 mA	2
Working Peak Reverse Voltage	VRWM		18		V		2
Maximum Reverse Leakage	IR			1	μA	@ VRWM	2
Maximum Reverse Voltage (Clamping)	VRSM			29.2	V	@ IRSM	2
Maximum Reverse Surge Current	IRSM			20.6	A		2
Breakdown voltage tolerance (suffix A)		-5		5	%	Suffix A: 5 % tolerance unidirectional device	2
Minimum Peak Pulse Power Dissipation	PPK			600	Watts	TP = 1 ms	1
Peak Forward Surge Current	IFSM			40	Amps	8.3 ms single half sine wave superimposed on rated load (JEDEC Method), unidirectional only	1
Operating Temperature Range	TJ	-55		150	°C		1
Storage Temperature Range	TSTG	-55		150	°C		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 5.0 mm2 (0.03 mm thick) copper pads to each terminal.	1

CAD (KiCad official)

Symbol: SMA6J18A-Q
Footprint: Diode_SMD:D_SMA
3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
3D model files: sma6j18a-q-etched.step / sma6j18a-q-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sma6j18a-q.step / sma6j18a-q.glb are the bare package body.

Provenance

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

Datasheet: BOURNS datasheet (6 pp, sha256 e9eba128067c04f1, retrieved 2026-10-26, 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

# SMA6J18A-Q

**BOURNS** · TVS · SMA(DO-214AC)

SMA6J18A-Q from BOURNS, in a SMA(DO-214AC). 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 terminal, marked by the cathode band on this unidirectional device; connect to the protected line, which has a working peak reverse voltage of 18 V and a breakdown voltage of 20.0 to 22.1 V at 1.0 mA, clamping at a maximum of 29.2 V at 20.6 A. |
| 2 | A | passive | Anode terminal at the end opposite the cathode band, normally connected to ground; the device handles 600 W peak pulse power (TP = 1 ms). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | BOURNS |
| Package | SMA(DO-214AC) |
| Category | TVS/Fuse/Board Level 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 | VBR | 20 |  | 22.1 | V | @ IT = 1.0 mA | 2 |
| Working Peak Reverse Voltage | VRWM |  | 18 |  | V |  | 2 |
| Maximum Reverse Leakage | IR |  |  | 1 | μA | @ VRWM | 2 |
| Maximum Reverse Voltage (Clamping) | VRSM |  |  | 29.2 | V | @ IRSM | 2 |
| Maximum Reverse Surge Current | IRSM |  |  | 20.6 | A |  | 2 |
| Breakdown voltage tolerance (suffix A) |  | -5 |  | 5 | % | Suffix A: 5 % tolerance unidirectional device | 2 |
| Minimum Peak Pulse Power Dissipation | PPK |  |  | 600 | Watts | TP = 1 ms | 1 |
| Peak Forward Surge Current | IFSM |  |  | 40 | Amps | 8.3 ms single half sine wave superimposed on rated load (JEDEC Method), unidirectional only | 1 |
| Operating Temperature Range | TJ | -55 |  | 150 | °C |  | 1 |
| Storage Temperature Range | TSTG | -55 |  | 150 | °C |  | 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 5.0 mm2 (0.03 mm thick) copper pads to each terminal. | 1 |

## CAD (KiCad official)

- Symbol: `SMA6J18A-Q`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files: `sma6j18a-q-etched.step` / `sma6j18a-q-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sma6j18a-q.step` / `sma6j18a-q.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [BOURNS datasheet](docs/sma6j18a-q-datasheet.pdf) (6 pp, sha256 `e9eba128067c04f1`, retrieved 2026-10-26, 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/sma6j18a-q-datasheet.pdf)