# SZ1SMB5925BT3G

**onsemi** · Zener Diodes · SMB

SZ1SMB5925BT3G from onsemi, in a SMB. 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 terminal indicated by the polarity band; for the 10 V (5925B) Zener it is the positive reverse-biased terminal with VZ 9.5 V min / 10 V nom / 10.5 V max at IZT = 37.5 mA. |
| 2 | Anode | passive | Anode terminal (non-polarity-band end) of the 3 W Zener diode, with forward voltage VF of 1.5 V max at IF = 200 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SMB |
| 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 | 9.5 | 10 | 10.5 | V | @ IZT = 37.5 mA, TL = 30°C | 3 |
| Zener Test Current | IZT |  | 37.5 |  | mA |  | 3 |
| Maximum Zener Impedance | ZZT |  |  | 4.5 | Ω | @ IZT | 3 |
| Maximum Zener Impedance | ZZK |  |  | 500 | Ω | @ IZK = 0.25 mA | 3 |
| Reverse Leakage Current | IR |  |  | 5 | µA | @ VR = 8 V | 3 |
| Maximum DC Zener Current | IZM |  |  | 150 | mA |  | 3 |
| Forward Voltage | VF |  |  | 1.5 | V | IF = 200 mA(dc) | 3 |
| Maximum Steady State Power Dissipation | PD |  |  | 3 | W | TL = 75°C, zero lead length | 1 |
| Maximum Steady State Power Dissipation | PD |  |  | 550 | mW | TA = 25°C, FR-4 board, recommended footprint | 1 |
| Derating above 75°C |  |  | 40 |  | mW/°C | Derate above 75°C | 1 |
| Derating above 25°C |  |  | 4.4 |  | mW/°C | Derate above 25°C | 1 |
| Operating and Storage Temperature Range | TJ, Tstg | -65 |  | 150 | °C |  | 1 |
| Thermal Resistance Junction-to-Lead | RθJL |  | 25 |  | °C/W |  | 1 |
| Thermal Resistance Junction-to-Ambient | RθJA |  | 226 |  | °C/W | FR-4 board, recommended footprint | 1 |
| Zener Voltage Tolerance |  | -5 |  | 5 | % | Type number indicates ±5% | 3 |

## CAD (KiCad official)

- Symbol: `SZ1SMB5925BT3G`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB (KiCad packages3D, STEP)
- 3D model files: `sz1smb5925bt3g-etched.step` / `sz1smb5925bt3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sz1smb5925bt3g.step` / `sz1smb5925bt3g.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/sz1smb5925bt3-d.pdf) (7 pp, sha256 `b2ddba7d745c56c9`, 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/sz1smb5925bt3g-datasheet.pdf)