SZMMBZ33VAWT1G

onsemi · ESD And Surge Protection (TVS/ESD) · SC-70-3

SZMMBZ33VAWT1G from onsemi, in a SC-70-3. 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 1	passive	Cathode of the first Zener junction in the dual common-anode device; used as a unidirectional Zener when the circuit is tied to pins 1 and 3.
2	CATHODE 2	passive	Cathode of the second Zener junction in the dual common-anode device; used as a unidirectional Zener when the circuit is tied to pins 2 and 3.
3	ANODE	passive	Common anode shared by both Zener junctions, which protects two separate lines with one package; the datasheet also allows a single bidirectional configuration.

Key specifications

Parameter	Value
Manufacturer	onsemi
Package	SC-70-3
Category	Circuit Protection
Pins	3

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 (min/nom/max) at IT	VBR	31.35	33	34.65	V	@ IT = 1.0 mA	2
Maximum reverse leakage current	IR			50	nA	@ VRWM	2
Maximum temperature coefficient of VBR	VBR			30.4	mV/°C		2
Forward voltage	VF			0.9	V	@ IF = 10 mA	2
Peak power dissipation	Ppk			40	W	@ 1.0 ms (Note 1), TL ≤ 25°C	2
Total power dissipation on FR-5 board	PD			200	mW	@ TA = 25°C (Note 2)	2
Junction and storage temperature range	TJ, Tstg	-55		150	°C		2
Thermal resistance junction-to-ambient	RθJA		618		°C/W		2
Working peak reverse voltage	VRWM		26		V		2
Clamping voltage	VC		46		V	@ IPP = 0.87 A (Note 4)	2
Maximum reverse peak pulse current	IPP		0.87		A		2

CAD (KiCad official)

Symbol: SZMMBZ33VAWT1G
Footprint: Package_TO_SOT_SMD:SOT-323_SC-70
3D model: SC-70-3 (KiCad packages3D, STEP)
3D model files: szmmbz33vawt1g-etched.step / szmmbz33vawt1g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); szmmbz33vawt1g.step / szmmbz33vawt1g.glb are the bare package body.

Provenance

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

Datasheet: onsemi datasheet (6 pp, sha256 f889917352bb8aa4, retrieved 2026-10-16, 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

# SZMMBZ33VAWT1G

**onsemi** · ESD And Surge Protection (TVS/ESD) · SC-70-3

SZMMBZ33VAWT1G from onsemi, in a SC-70-3. 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 1 | passive | Cathode of the first Zener junction in the dual common-anode device; used as a unidirectional Zener when the circuit is tied to pins 1 and 3. |
| 2 | CATHODE 2 | passive | Cathode of the second Zener junction in the dual common-anode device; used as a unidirectional Zener when the circuit is tied to pins 2 and 3. |
| 3 | ANODE | passive | Common anode shared by both Zener junctions, which protects two separate lines with one package; the datasheet also allows a single bidirectional configuration. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SC-70-3 |
| Category | Circuit Protection |
| Pins | 3 |

## 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 (min/nom/max) at IT | VBR | 31.35 | 33 | 34.65 | V | @ IT = 1.0 mA | 2 |
| Maximum reverse leakage current | IR |  |  | 50 | nA | @ VRWM | 2 |
| Maximum temperature coefficient of VBR | VBR |  |  | 30.4 | mV/°C |  | 2 |
| Forward voltage | VF |  |  | 0.9 | V | @ IF = 10 mA | 2 |
| Peak power dissipation | Ppk |  |  | 40 | W | @ 1.0 ms (Note 1), TL ≤ 25°C | 2 |
| Total power dissipation on FR-5 board | PD |  |  | 200 | mW | @ TA = 25°C (Note 2) | 2 |
| Junction and storage temperature range | TJ, Tstg | -55 |  | 150 | °C |  | 2 |
| Thermal resistance junction-to-ambient | RθJA |  | 618 |  | °C/W |  | 2 |
| Working peak reverse voltage | VRWM |  | 26 |  | V |  | 2 |
| Clamping voltage | VC |  | 46 |  | V | @ IPP = 0.87 A (Note 4) | 2 |
| Maximum reverse peak pulse current | IPP |  | 0.87 |  | A |  | 2 |

## CAD (KiCad official)

- Symbol: `SZMMBZ33VAWT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SC-70-3 (KiCad packages3D, STEP)
- 3D model files: `szmmbz33vawt1g-etched.step` / `szmmbz33vawt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `szmmbz33vawt1g.step` / `szmmbz33vawt1g.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/8603012281072697344) (6 pp, sha256 `f889917352bb8aa4`, retrieved 2026-10-16, 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/szmmbz33vawt1g-datasheet.pdf)