SZMMBZ5248ELT1G

onsemi · Zener Diodes · SOT-23

SZMMBZ5248ELT1G 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 diode; the cathode is marked by the polarity band on the package.
2	NC	unconnected	No connection on the SOT-23 package (datasheet pinout: 1-Anode, 2-No Connection, 3-Cathode).
3	CATHODE	passive	Cathode terminal of the Zener diode, identified by the polarity band; the device is a voltage regulator with 225 mW rating on FR-4 or FR-5 board.

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 (nominal 18 V, 5% class)	VZ	17.1	18	18.9	V	@ IZT = 7 mA; pulse test, TA = 25°C (Note 4)	2
Maximum Zener Impedance	ZZT			21	Ω	@ IZT = 7 mA	2
Maximum Zener Impedance	ZZK			600	Ω	@ IZK = 0.25 mA	2
Reverse Leakage Current	IR			0.1	µA	@ VR = 14 V	2
Forward Voltage	VF			0.95	V	@ IF = 10 mA	2
Peak Power Dissipation	Ppk			225	W	@ 20 µs pulse, TL ≤ 25°C (Note 1)	1
Total Power Dissipation on FR-5 Board	PD			225	mW	@ TA = 25°C, FR-5 board (Note 2)	1
Total Power Dissipation on Alumina Substrate	PD			300	mW	@ TA = 25°C, alumina substrate (Note 3)	1
Junction and Storage Temperature Range	TJ, Tstg	-65		150	°C		1
Thermal Resistance, Junction-to-Ambient, FR-5 Board	RθJA			556	°C/W	FR-5 board (Note 2)	1
Thermal Resistance, Junction-to-Ambient, Alumina Substrate	RθJA			417	°C/W	alumina substrate (Note 3)	1

CAD (KiCad official)

Symbol: SZMMBZ5248ELT1G
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D, STEP)
3D model files: szmmbz5248elt1g-etched.step / szmmbz5248elt1g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); szmmbz5248elt1g.step / szmmbz5248elt1g.glb are the bare package body.

Provenance

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

Datasheet: onsemi datasheet (7 pp, sha256 aad7747846afa508, 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

# SZMMBZ5248ELT1G

**onsemi** · Zener Diodes · SOT-23

SZMMBZ5248ELT1G 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 diode; the cathode is marked by the polarity band on the package. |
| 2 | NC | unconnected | No connection on the SOT-23 package (datasheet pinout: 1-Anode, 2-No Connection, 3-Cathode). |
| 3 | CATHODE | passive | Cathode terminal of the Zener diode, identified by the polarity band; the device is a voltage regulator with 225 mW rating on FR-4 or FR-5 board. |

## 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 (nominal 18 V, 5% class) | VZ | 17.1 | 18 | 18.9 | V | @ IZT = 7 mA; pulse test, TA = 25°C (Note 4) | 2 |
| Maximum Zener Impedance | ZZT |  |  | 21 | Ω | @ IZT = 7 mA | 2 |
| Maximum Zener Impedance | ZZK |  |  | 600 | Ω | @ IZK = 0.25 mA | 2 |
| Reverse Leakage Current | IR |  |  | 0.1 | µA | @ VR = 14 V | 2 |
| Forward Voltage | VF |  |  | 0.95 | V | @ IF = 10 mA | 2 |
| Peak Power Dissipation | Ppk |  |  | 225 | W | @ 20 µs pulse, TL ≤ 25°C (Note 1) | 1 |
| Total Power Dissipation on FR-5 Board | PD |  |  | 225 | mW | @ TA = 25°C, FR-5 board (Note 2) | 1 |
| Total Power Dissipation on Alumina Substrate | PD |  |  | 300 | mW | @ TA = 25°C, alumina substrate (Note 3) | 1 |
| Junction and Storage Temperature Range | TJ, Tstg | -65 |  | 150 | °C |  | 1 |
| Thermal Resistance, Junction-to-Ambient, FR-5 Board | RθJA |  |  | 556 | °C/W | FR-5 board (Note 2) | 1 |
| Thermal Resistance, Junction-to-Ambient, Alumina Substrate | RθJA |  |  | 417 | °C/W | alumina substrate (Note 3) | 1 |

## CAD (KiCad official)

- Symbol: `SZMMBZ5248ELT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `szmmbz5248elt1g-etched.step` / `szmmbz5248elt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `szmmbz5248elt1g.step` / `szmmbz5248elt1g.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/8589981104250642432) (7 pp, sha256 `aad7747846afa508`, 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/szmmbz5248elt1g-datasheet.pdf)