# BZT52HC39WF-7

**Diodes Incorporated** · Zener Diodes · SOD-123F

BZT52HC39WF-7 from Diodes Incorporated, in a SOD-123F. 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 of the Zener diode, identified by the cathode band; BZT52HC39WF has VZ 37.0-41.0V at IZT 2mA. |
| 2 | A | passive | Anode of the Zener diode; forward voltage 0.9V at IF = 10mA, maximum forward current 250mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOD-123F |
| 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 | 37 |  | 41 | V | @ IZT = 2 mA | 3 |
| Test Current | IZT |  | 2 |  | mA |  | 3 |
| Maximum Zener Impedance | ZZT |  |  | 75 | Ω | @ IZT, f = 1kHz | 3 |
| Maximum Zener Impedance (knee) | ZZK |  |  | 300 | Ω | @ IZK = 1 mA, f = 1kHz | 3 |
| Temperature Coefficient | TC | 33.4 |  |  | mV/°C | @ IZT | 3 |
| Total Capacitance | CT |  |  | 45 | pF | f = 1MHz, VR = 0V | 3 |
| Maximum Reverse Current | IR |  |  | 0.05 | µA | @ VR = 27.3 V | 3 |
| Forward Voltage | VF |  |  | 0.9 | V | @ IF = 10mA, TA = +25°C | 2 |
| Forward Current | IF |  |  | 250 | mA | TA = +25°C | 2 |
| Power Dissipation (Note 6) | PD |  |  | 375 | mW | Minimum recommended pad layout, FR-4 | 2 |
| Power Dissipation (Note 7) | PD |  |  | 830 | mW | FR-4, cathode pad 1cm2 | 2 |
| Thermal Resistance, Junction to Ambient (Note 6) | RθJA |  | 330 |  | °C/W | Minimum recommended pad layout, FR-4 | 2 |
| Thermal Resistance, Junction to Ambient (Note 7) | RθJA |  | 150 |  | °C/W | FR-4, cathode pad 1cm2 | 2 |
| Operating and Storage Temperature Range | TJ, TSTG | -65 |  | 150 | °C |  | 2 |

## 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 |
|---|---|---|---|---|
| contacts | Copper Alloy | tin |  Terminal Connections: Cathode Band  Terminals: Finish - Matte Tin Annealed over Copper Alloy | 1 |

## CAD (KiCad official)

- Symbol: `BZT52HC39WF-7`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123F (KiCad packages3D, STEP)
- 3D model files: `bzt52hc39wf-7-etched.step` / `bzt52hc39wf-7-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzt52hc39wf-7.step` / `bzt52hc39wf-7.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Diodes Incorporated datasheet](https://www.diodes.com/assets/Datasheets/BZT52HC39WF-7.pdf) (5 pp, sha256 `251bfd6eb9903714`, retrieved 2026-10-31, 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/bzt52hc39wf-7-datasheet.pdf)