MMSZ30T1G

onsemi · Zener Diodes · SOD-123

MMSZ30T1G from onsemi, in a SOD-123. 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, indicated by the polarity band; for the MMSZ30T1G the nominal Zener voltage is 30 V (28.50 V to 31.50 V) at IZT1 = 2 mA, with the reverse Zener current flowing into this pin.
2	A	passive	Anode (Style 1, pin 2); the Zener diode forward voltage is 0.9 V max at IF = 10 mA.

Key specifications

Parameter	Value
Manufacturer	onsemi
Package	SOD-123
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 1	VZ1	28.5	30	31.5	V	IZT1 = 2 mA, TA = 25C, PW = 1 ms	3
Zener Voltage 2	VZ2	27.8		32	V	IZT2 = 0.1 mA, TA = 25C, PW = 1 ms	3
Maximum Zener Impedance 1	ZZT1			80	Ω	IZT1 = 2 mA, IZ(AC) = 0.1 IZ(DC), f = 1 kHz	3
Maximum Zener Impedance 2	ZZT2			300	Ω	IZT2 = 0.1 mA, IZ(AC) = 0.1 IZ(DC), f = 1 kHz	3
Max Reverse Leakage Current	IR			0.05	µA	VR = 21 V	3
Forward Voltage	VF			0.9	V	IF = 10 mA, TA = 25C	3
Total Power Dissipation on FR-5 Board	PD			500	mW	TL = 75C	1
Power Derating above 75C	PD			6.7	mW/C	Derated above 75C	1
Junction and Storage Temperature Range	TJ, Tstg	-55		150	C		1
Thermal Resistance, Junction-to-Ambient	RθJA			340	C/W	Note 2, infrared scan method	1
Thermal Resistance, Junction-to-Lead	RθJL			150	C/W	Note 2, infrared scan method	1
Zener Voltage Tolerance		-5		5	%	Standard tolerance on nominal Zener voltage	3

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
housing	PPA		 ESD Rating of Class 3 (> 16 kV) per Human Body Model  AEC−Q101 Qualified and PPAP Capable	1

CAD (KiCad official)

Symbol: MMSZ30T1G
Footprint: Diode_SMD:D_SOD-123F
3D model: SOD-123 (KiCad packages3D, STEP)
3D model files: mmsz30t1g-etched.step / mmsz30t1g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmsz30t1g.step / mmsz30t1g.glb are the bare package body.

Provenance

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

Datasheet: onsemi datasheet (6 pp, sha256 0048ab4ae41ba770, retrieved 2026-10-23, tier: manufacturer)
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

# MMSZ30T1G

**onsemi** · Zener Diodes · SOD-123

MMSZ30T1G from onsemi, in a SOD-123. 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, indicated by the polarity band; for the MMSZ30T1G the nominal Zener voltage is 30 V (28.50 V to 31.50 V) at IZT1 = 2 mA, with the reverse Zener current flowing into this pin. |
| 2 | A | passive | Anode (Style 1, pin 2); the Zener diode forward voltage is 0.9 V max at IF = 10 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOD-123 |
| 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 1 | VZ1 | 28.5 | 30 | 31.5 | V | IZT1 = 2 mA, TA = 25C, PW = 1 ms | 3 |
| Zener Voltage 2 | VZ2 | 27.8 |  | 32 | V | IZT2 = 0.1 mA, TA = 25C, PW = 1 ms | 3 |
| Maximum Zener Impedance 1 | ZZT1 |  |  | 80 | Ω | IZT1 = 2 mA, IZ(AC) = 0.1 IZ(DC), f = 1 kHz | 3 |
| Maximum Zener Impedance 2 | ZZT2 |  |  | 300 | Ω | IZT2 = 0.1 mA, IZ(AC) = 0.1 IZ(DC), f = 1 kHz | 3 |
| Max Reverse Leakage Current | IR |  |  | 0.05 | µA | VR = 21 V | 3 |
| Forward Voltage | VF |  |  | 0.9 | V | IF = 10 mA, TA = 25C | 3 |
| Total Power Dissipation on FR-5 Board | PD |  |  | 500 | mW | TL = 75C | 1 |
| Power Derating above 75C | PD |  |  | 6.7 | mW/C | Derated above 75C | 1 |
| Junction and Storage Temperature Range | TJ, Tstg | -55 |  | 150 | C |  | 1 |
| Thermal Resistance, Junction-to-Ambient | RθJA |  |  | 340 | C/W | Note 2, infrared scan method | 1 |
| Thermal Resistance, Junction-to-Lead | RθJL |  |  | 150 | C/W | Note 2, infrared scan method | 1 |
| Zener Voltage Tolerance |  | -5 |  | 5 | % | Standard tolerance on nominal Zener voltage | 3 |

## 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 |
|---|---|---|---|---|
| housing | PPA |  |  ESD Rating of Class 3 (> 16 kV) per Human Body Model  AEC−Q101 Qualified and PPAP Capable | 1 |

## CAD (KiCad official)

- Symbol: `MMSZ30T1G`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `mmsz30t1g-etched.step` / `mmsz30t1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmsz30t1g.step` / `mmsz30t1g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/mmsz30t1-d.pdf) (6 pp, sha256 `0048ab4ae41ba770`, retrieved 2026-10-23, tier: manufacturer)
- **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/mmsz30t1g-datasheet.pdf)