component
BZX84B39-7-F
Public Made by Adomby adom
Diodes Incorporated Zener Diodes, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownBZX84B39-7-F
Diodes Incorporated · Zener Diodes · SOT-23
BZX84B39-7-F from Diodes Incorporated, 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 | A | passive | Anode of the Zener diode (bottom-left lead in the device schematic); the datasheet gives VZ of 38.2V to 39.8V at IZT = 2.0mA for the BZX84B39. |
| 2 | NC | unconnected | No internal connection; the device schematic shows the bottom-right lead with no connection to the diode. |
| 3 | K | passive | Cathode of the Zener diode (top lead in the device schematic), which is the pin that goes positive in Zener breakdown operation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener voltage VZ (BZX84B39, nominal 39 V) | VZ | -2 | 2 | % | Printed ±2% tolerance on VZ (Features) | 1 | |
| Zener voltage range | VZ | 38.2 | 39 | 39.8 | V | @ IZT 2.0 mA (Note 7); typ = nominal 39 V | 2 |
| Maximum Zener impedance | ZZT | 130 | Ω | @ IZT 2.0 mA, f = 1 kHz | 2 | ||
| Maximum Zener impedance (knee) | ZZK | 350 | Ω | @ IZK 0.5 mA, f = 1 kHz | 2 | ||
| Maximum reverse current | IR | 0.1 | µA | @ VR 27.3 V (Note 7) | 2 | ||
| Temperature coefficient of VZ | 33.4 | 41.2 | mV/°C | @ IZT 2.0 mA | 2 | ||
| Power dissipation | PD | 300 | mW | Note 5 (FR-4 PCB with recommended pad layout) | 2 | ||
| Power dissipation | PD | 350 | mW | Note 6 (terminals kept at ambient temperature) | 2 | ||
| Thermal resistance, junction to ambient air | RϴJA | 417 | °C/W | Note 5 | 2 | ||
| Thermal resistance, junction to ambient air | RϴJA | 357 | °C/W | Note 6 | 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 | tin | • Terminals: Solderable per MIL-STD-202, Method 208 Lead-Free Plating (Matte Tin Finish Annealed over Alloy 42 Leadframe). | 1 |
CAD (KiCad official)
- Symbol:
BZX84B39-7-F - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
bzx84b39-7-f-etched.step/bzx84b39-7-f-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bzx84b39-7-f.step/bzx84b39-7-f.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Diodes Incorporated datasheet (5 pp, sha256
d7505f68264bd157, retrieved 2026-10-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).