SZMM3Z9V1ST1G

onsemi · Zener Diodes · SOD-323

SZMM3Z9V1ST1G 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 (marked by polarity band); the Zener voltage regulator is reverse-biased here, with VZ 8.85 V min to 9.23 V max at IZT = 5.0 mA for the 9V1 device.
2	Anode	passive	Anode of the Zener diode, with forward voltage VF of 0.9 V max at IF = 10 mA.

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
Zener Voltage	VZ	8.85		9.23	V	IZT = 5.0 mA, TA = 25°C	3
Maximum Zener Impedance at IZK	ZZK			160	Ω	IZ = 0.5 mA	3
Maximum Zener Impedance at IZT	ZZT			15	Ω	IZ = IZT @ 10% Mod	3
Reverse Leakage Current	IR			0.5	µA	VR = 6.0 V	3
Temperature Coefficient of VZ	dVZ/dt	3.8		7	mV/K	IZT1 = 5 mA	3
Capacitance	C			130	pF	VR = 0, f = 1 MHz	3
Forward Voltage	VF			0.9	V	IF = 10 mA	2
Test Current	IZT		5		mA		3
Total Device Dissipation	PD			300	mW	FR-4 board, TA = 25°C	2
Derate above 25°C				2.4	mW/°C	FR-4 board	2
Thermal Resistance Junction-to-Ambient	RθJA			416	°C/W		2
Junction and Storage Temperature Range	TJ, Tstg	-65		150	°C		2

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: SZMM3Z9V1ST1G
Footprint: Diode_SMD:D_SOD-323
3D model: SOD-323 (KiCad packages3D, STEP)
3D model files: szmm3z9v1st1g-etched.step / szmm3z9v1st1g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); szmm3z9v1st1g.step / szmm3z9v1st1g.glb are the bare package body.

Provenance

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

Datasheet: onsemi datasheet (6 pp, sha256 64232f49c56f3413, 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

# SZMM3Z9V1ST1G

**onsemi** · Zener Diodes · SOD-323

SZMM3Z9V1ST1G 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 (marked by polarity band); the Zener voltage regulator is reverse-biased here, with VZ 8.85 V min to 9.23 V max at IZT = 5.0 mA for the 9V1 device. |
| 2 | Anode | passive | Anode of the Zener diode, with forward voltage VF of 0.9 V max at IF = 10 mA. |

## 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 |
|---|---|---|---|---|---|---|---|
| Zener Voltage | VZ | 8.85 |  | 9.23 | V | IZT = 5.0 mA, TA = 25°C | 3 |
| Maximum Zener Impedance at IZK | ZZK |  |  | 160 | Ω | IZ = 0.5 mA | 3 |
| Maximum Zener Impedance at IZT | ZZT |  |  | 15 | Ω | IZ = IZT @ 10% Mod | 3 |
| Reverse Leakage Current | IR |  |  | 0.5 | µA | VR = 6.0 V | 3 |
| Temperature Coefficient of VZ | dVZ/dt | 3.8 |  | 7 | mV/K | IZT1 = 5 mA | 3 |
| Capacitance | C |  |  | 130 | pF | VR = 0, f = 1 MHz | 3 |
| Forward Voltage | VF |  |  | 0.9 | V | IF = 10 mA | 2 |
| Test Current | IZT |  | 5 |  | mA |  | 3 |
| Total Device Dissipation | PD |  |  | 300 | mW | FR-4 board, TA = 25°C | 2 |
| Derate above 25°C |  |  |  | 2.4 | mW/°C | FR-4 board | 2 |
| Thermal Resistance Junction-to-Ambient | RθJA |  |  | 416 | °C/W |  | 2 |
| Junction and Storage Temperature Range | TJ, Tstg | -65 |  | 150 | °C |  | 2 |

## 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: `SZMM3Z9V1ST1G`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `szmm3z9v1st1g-etched.step` / `szmm3z9v1st1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `szmm3z9v1st1g.step` / `szmm3z9v1st1g.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/8589996554691252224) (6 pp, sha256 `64232f49c56f3413`, 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/szmm3z9v1st1g-datasheet.pdf)