MM3Z12VT1G

onsemi · Zener Diodes · SOD-323

MM3Z12VT1G from onsemi, in a SOD-323. 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 is marked by the polarity band on the package; the Zener regulating terminal is identified by this band, per the Style 1 pin assignment.
2	Anode	passive	Anode is the second terminal of the two-lead SOD-323 Zener diode, opposite the polarity-band cathode (Style 1 pin assignment).

Key specifications

Parameter	Value
Manufacturer	onsemi
Package	SOD-323
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
Reverse Zener Voltage	VZ	11.4	12	12.7	V	@ IZT = 5 mA; pulse test at TA = 25°C (Note 2)	2
Maximum Zener Impedance	ZZT			25	Ω	@ IZT = 5 mA	2
Maximum Zener Impedance	ZZK			80	Ω	@ IZK = 0.5 mA	2
Maximum Temperature Coefficient of VZ	VZ	6		10	mV/k		2
Max. Capacitance	C			130	pF	@ VR = 0 and f = 1 MHz	2
Forward Voltage	VF			0.9	V	@ IF = 10 mA (for all types)	2
Total Device Dissipation	PD			300	mW	FR-4 board, single-sided copper, mounting pad 1 cm2, @ TA = 25°C (Note 1)	1
Derate above 25°C				2.4	mW/°C	Derate above 25°C	1
Thermal Resistance, Junction-to-Ambient	RJA			416	°C/W		1
Junction and Storage Temperature Range	TJ, Tstg	-65		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		tin	LEADS: Plated with Pb−Sn or Sn Only (Pb−Free) POLARITY: Cathode Indicated by Polarity Band	1

CAD (KiCad official)

Symbol: MM3Z12VT1G
Footprint: Diode_SMD:D_SOD-323
3D model: SOD-323 (KiCad packages3D, STEP)
3D model files: mm3z12vt1g-etched.step / mm3z12vt1g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mm3z12vt1g.step / mm3z12vt1g.glb are the bare package body.

Provenance

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

Datasheet: onsemi datasheet (5 pp, sha256 c3256d6f49d685e2, retrieved 2026-10-23, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-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

# MM3Z12VT1G

**onsemi** · Zener Diodes · SOD-323

MM3Z12VT1G from onsemi, in a SOD-323. 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 is marked by the polarity band on the package; the Zener regulating terminal is identified by this band, per the Style 1 pin assignment. |
| 2 | Anode | passive | Anode is the second terminal of the two-lead SOD-323 Zener diode, opposite the polarity-band cathode (Style 1 pin assignment). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOD-323 |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse Zener Voltage | VZ | 11.4 | 12 | 12.7 | V | @ IZT = 5 mA; pulse test at TA = 25°C (Note 2) | 2 |
| Maximum Zener Impedance | ZZT |  |  | 25 | Ω | @ IZT = 5 mA | 2 |
| Maximum Zener Impedance | ZZK |  |  | 80 | Ω | @ IZK = 0.5 mA | 2 |
| Maximum Temperature Coefficient of VZ | VZ | 6 |  | 10 | mV/k |  | 2 |
| Max. Capacitance | C |  |  | 130 | pF | @ VR = 0 and f = 1 MHz | 2 |
| Forward Voltage | VF |  |  | 0.9 | V | @ IF = 10 mA (for all types) | 2 |
| Total Device Dissipation | PD |  |  | 300 | mW | FR-4 board, single-sided copper, mounting pad 1 cm2, @ TA = 25°C (Note 1) | 1 |
| Derate above 25°C |  |  |  | 2.4 | mW/°C | Derate above 25°C | 1 |
| Thermal Resistance, Junction-to-Ambient | RJA |  |  | 416 | °C/W |  | 1 |
| Junction and Storage Temperature Range | TJ, Tstg | -65 |  | 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 |  | tin | LEADS: Plated with Pb−Sn or Sn Only (Pb−Free) POLARITY: Cathode Indicated by Polarity Band | 1 |

## CAD (KiCad official)

- Symbol: `MM3Z12VT1G`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `mm3z12vt1g-etched.step` / `mm3z12vt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mm3z12vt1g.step` / `mm3z12vt1g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588893066984378368) (5 pp, sha256 `c3256d6f49d685e2`, retrieved 2026-10-23, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/mm3z12vt1g-datasheet.pdf)