MMBZ5234BLT1G

onsemi · Zener Diodes · SOT-23

MMBZ5234BLT1G from onsemi, in a SOT-23. 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	ANODE	passive	Anode terminal of the Zener regulator diode; the datasheet gives the pinout as 1-Anode, 2-No Connection, 3-Cathode for this series.
2	NC	unconnected	No internal connection; the datasheet specifies this pin as no connection and it is not used in the circuit.
3	CATHODE	passive	Cathode terminal of the Zener regulator diode, identified on the package by the polarity band; device ratings are limited to a total power dissipation of 225 mW on FR-5 board and a junction and storage temperature range of -65 to +150 °C.

Key specifications

Parameter	Value
Manufacturer	onsemi
Package	SOT-23
Category	Diodes
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
Reverse Zener Voltage	VZ	5.89	6.2	6.51	V	@ IZT = 20 mA; pulse test at TA = 25°C (Note 3)	3
Maximum Zener Impedance @ IZT	ZZT		7	7	Ω	@ IZT = 20 mA	3
Maximum Zener Impedance @ IZK	ZZK		1000	1000	Ω	@ IZK = 0.25 mA	3
Reverse Leakage Current	IR		5		A	@ VR = 4 V	3
Forward Voltage	VF			0.9	V	@ IF = 10 mA, for all types	3
Total Power Dissipation on FR-5 Board	PD			225	mW	FR-5 board (1.0 X 0.75 X 0.62 in.), TA = 25°C (Note 1)	1
Total Power Dissipation on Alumina Substrate	PD			300	mW	Alumina substrate (0.4 X 0.3 X 0.024 in, 99.5% alumina), TA = 25°C (Note 2)	1
Thermal Resistance, Junction-to-Ambient (FR-5 board)	RJA			556	°C/W	FR-5 board (Note 1)	1
Thermal Resistance, Junction-to-Ambient (Alumina substrate)	RJA			417	°C/W	Alumina substrate (Note 2)	1
Junction and Storage Temperature Range	TJ, Tstg	-65		150	°C		1

CAD (KiCad official)

Symbol: MMBZ5234BLT1G
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D, STEP)
3D model files: mmbz5234blt1g-etched.step / mmbz5234blt1g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmbz5234blt1g.step / mmbz5234blt1g.glb are the bare package body.

Provenance

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

Datasheet: onsemi datasheet (6 pp, sha256 bdbb8fa2d7f751fd, retrieved 2026-10-18, 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

# MMBZ5234BLT1G

**onsemi** · Zener Diodes · SOT-23

MMBZ5234BLT1G from onsemi, in a SOT-23. 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 | ANODE | passive | Anode terminal of the Zener regulator diode; the datasheet gives the pinout as 1-Anode, 2-No Connection, 3-Cathode for this series. |
| 2 | NC | unconnected | No internal connection; the datasheet specifies this pin as no connection and it is not used in the circuit. |
| 3 | CATHODE | passive | Cathode terminal of the Zener regulator diode, identified on the package by the polarity band; device ratings are limited to a total power dissipation of 225 mW on FR-5 board and a junction and storage temperature range of -65 to +150 °C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOT-23 |
| Category | Diodes |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse Zener Voltage | VZ | 5.89 | 6.2 | 6.51 | V | @ IZT = 20 mA; pulse test at TA = 25°C (Note 3) | 3 |
| Maximum Zener Impedance @ IZT | ZZT |  | 7 | 7 | Ω | @ IZT = 20 mA | 3 |
| Maximum Zener Impedance @ IZK | ZZK |  | 1000 | 1000 | Ω | @ IZK = 0.25 mA | 3 |
| Reverse Leakage Current | IR |  | 5 |  | A | @ VR = 4 V | 3 |
| Forward Voltage | VF |  |  | 0.9 | V | @ IF = 10 mA, for all types | 3 |
| Total Power Dissipation on FR-5 Board | PD |  |  | 225 | mW | FR-5 board (1.0 X 0.75 X 0.62 in.), TA = 25°C (Note 1) | 1 |
| Total Power Dissipation on Alumina Substrate | PD |  |  | 300 | mW | Alumina substrate (0.4 X 0.3 X 0.024 in, 99.5% alumina), TA = 25°C (Note 2) | 1 |
| Thermal Resistance, Junction-to-Ambient (FR-5 board) | RJA |  |  | 556 | °C/W | FR-5 board (Note 1) | 1 |
| Thermal Resistance, Junction-to-Ambient (Alumina substrate) | RJA |  |  | 417 | °C/W | Alumina substrate (Note 2) | 1 |
| Junction and Storage Temperature Range | TJ, Tstg | -65 |  | 150 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `MMBZ5234BLT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mmbz5234blt1g-etched.step` / `mmbz5234blt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbz5234blt1g.step` / `mmbz5234blt1g.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/8586178761855680512) (6 pp, sha256 `bdbb8fa2d7f751fd`, retrieved 2026-10-18, 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/mmbz5234blt1g-datasheet.pdf)