1SMA5951B

LGE · Zener Diodes · DO-214AC(SMA)

1SMA5951B from LGE, in a DO-214AC(SMA). 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 banded/marked end per the datasheet; pad 1 of the KiCad diode footprint.
2	A	passive	Anode.

Key specifications

Parameter	Value
Manufacturer	LGE
Package	DO-214AC(SMA)
Category	Diodes
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
Maximum Zener Impedance	ZZT			380	Ω	@ IZT 3.1 mA	2
Maximum Zener Impedance	ZZK			4500	Ω	@ IZK 0.25 mA	2
Maximum Reverse Leakage Current	IR			1	μA	@ VR 91.2 V	2
Maximum DC Zener Current	IZM			12	mA		2
Operating Junction and Storage Temperature Range	TJ, TSTG	-65		150	°C		1
DC Power Dissipation	PD			1.5	W	@ TL = 75 °C, measured zero lead length (1 in square copper pad, FR-4 board)	1
DC Power Dissipation	PD			0.5	W	@ Ta = 25 °C (FR-4 board)	1
Zener voltage tolerance (suffix B)	VZ	-5		5	%	Suffix B indicates ±5% tolerance	2
Nominal Zener Voltage	VZ		120		V	@ IZT 3.1 mA	2
Derate above 75 °C (DC power dissipation at TL)			20		mW/°C	above TL = 75 °C	1
Derate above 25 °C (DC power dissipation at Ta)			4		mW/°C	above Ta = 25 °C (FR-4 board)	1
Thermal Resistance Junction to Lead	RӨJL		50		°C/W	junction to lead	1
Thermal Resistance Junction to Ambient	RӨJA		250		°C/W	junction to ambient, FR-4 board	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		Measured zero lead length(1" square copper pad, FR-4 board) 20	1

CAD (KiCad official)

Symbol: 1SMA5951B
Footprint: Diode_SMD:D_SMA
3D model: DO-214AC(SMA) (KiCad packages3D, STEP)
3D model files: 1sma5951b-etched.step / 1sma5951b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 1sma5951b.step / 1sma5951b.glb are the bare package body.

Provenance

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

Datasheet: LGE datasheet (2 pp, sha256 2d9536ccf7f2af5d, retrieved 2026-10-21, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins, primary cathode-band convention (convention), consensus off (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

# 1SMA5951B

**LGE** · Zener Diodes · DO-214AC(SMA)

1SMA5951B from LGE, in a DO-214AC(SMA). 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 banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LGE |
| Package | DO-214AC(SMA) |
| Category | Diodes |
| 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 |
|---|---|---|---|---|---|---|---|
| Maximum Zener Impedance | ZZT |  |  | 380 | Ω | @ IZT 3.1 mA | 2 |
| Maximum Zener Impedance | ZZK |  |  | 4500 | Ω | @ IZK 0.25 mA | 2 |
| Maximum Reverse Leakage Current | IR |  |  | 1 | μA | @ VR 91.2 V | 2 |
| Maximum DC Zener Current | IZM |  |  | 12 | mA |  | 2 |
| Operating Junction and Storage Temperature Range | TJ, TSTG | -65 |  | 150 | °C |  | 1 |
| DC Power Dissipation | PD |  |  | 1.5 | W | @ TL = 75 °C, measured zero lead length (1 in square copper pad, FR-4 board) | 1 |
| DC Power Dissipation | PD |  |  | 0.5 | W | @ Ta = 25 °C (FR-4 board) | 1 |
| Zener voltage tolerance (suffix B) | VZ | -5 |  | 5 | % | Suffix B indicates ±5% tolerance | 2 |
| Nominal Zener Voltage | VZ |  | 120 |  | V | @ IZT 3.1 mA | 2 |
| Derate above 75 °C (DC power dissipation at TL) |  |  | 20 |  | mW/°C | above TL = 75 °C | 1 |
| Derate above 25 °C (DC power dissipation at Ta) |  |  | 4 |  | mW/°C | above Ta = 25 °C (FR-4 board) | 1 |
| Thermal Resistance Junction to Lead | RӨJL |  | 50 |  | °C/W | junction to lead | 1 |
| Thermal Resistance Junction to Ambient | RӨJA |  | 250 |  | °C/W | junction to ambient, FR-4 board | 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 |  | Measured zero lead length(1" square copper pad, FR-4 board) 20 | 1 |

## CAD (KiCad official)

- Symbol: `1SMA5951B`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: DO-214AC(SMA) (KiCad packages3D, STEP)
- 3D model files: `1sma5951b-etched.step` / `1sma5951b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma5951b.step` / `1sma5951b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [LGE datasheet](docs/1sma5951b-datasheet.pdf) (2 pp, sha256 `2d9536ccf7f2af5d`, retrieved 2026-10-21, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/1sma5951b-datasheet.pdf)