component
BZX84-B20
Public Made by Adomby adom
Nexperia Zener Diodes, SOT-23(TO-236AB). 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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README
markdownBZX84-B20
Nexperia · Zener Diodes · SOT-23(TO-236AB)
BZX84-B20 from Nexperia, in a SOT-23(TO-236AB). 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 voltage regulator diode; the datasheet gives forward current IF = 200 mA maximum (Table 5) and forward voltage VF = 0.9 V maximum at IF = 10 mA (Table 1). |
| 2 | n.c. | unconnected | Not connected; the pin has no internal connection and is not used in the circuit. |
| 3 | K | passive | Cathode of the voltage regulator diode; for BZX84-B20 the working voltage is 19.60 V minimum to 20.40 V maximum at IZ = 5 mA (Table 8), and total power dissipation is limited to 250 mW at Tamb ≤ 25 °C (Table 5). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SOT-23(TO-236AB) |
| 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 |
|---|---|---|---|---|---|---|---|
| Working voltage (B tolerance, nominal 20 V) | VZ | 19.6 | 20.4 | V | IZ = 5 mA | 6 | |
| Maximum differential resistance | rdif | 225 | Ω | IZ = 1 mA | 6 | ||
| Maximum differential resistance | rdif | 55 | Ω | IZ = 5 mA | 6 | ||
| Reverse current | IR | 0.05 | μA | Max VR = 14 V | 6 | ||
| Temperature coefficient | SZ | 14.4 | 18 | mV/K | IZ = 5 mA | 6 | |
| Diode capacitance | Cd | 60 | pF | f = 1 MHz; VR = 0 V | 6 | ||
| Non-repetitive peak reverse current | IZSM | 1.5 | A | tp = 100 μs; square wave; Tj = 25 °C | 6 | ||
| Forward voltage | VF | 0.9 | V | IF = 10 mA; tp ≤ 100 μs; δ ≤ 0.02 | 4 | ||
| Forward current | IF | 200 | mA | 4 | |||
| Non-repetitive peak reverse power dissipation | PZSM | 40 | W | tp = 100 μs; square wave; Tj = 25 °C prior to surge | 4 | ||
| Total power dissipation | Ptot | 250 | mW | Tamb ≤ 25 °C; FR4 PCB, single-sided 70 µm copper, standard footprint | 4 | ||
| Junction temperature | Tj | 150 | °C | 4 | |||
| Ambient temperature | Tamb | -55 | 150 | °C | 4 | ||
| Storage temperature | Tstg | -65 | 150 | °C | 4 | ||
| Thermal resistance from junction to ambient | Rth(j-a) | 500 | K/W | in free air; FR4 PCB, single-sided 70 µm copper, standard footprint | 4 | ||
| Thermal resistance from junction to solder point | Rth(j-sp) | 330 | K/W | soldering point of cathode tab | 4 |
CAD (KiCad official)
- Symbol:
BZX84-B20 - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23(TO-236AB) (KiCad packages3D, STEP)
- 3D model files:
bzx84-b20-etched.step/bzx84-b20-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bzx84-b20.step/bzx84-b20.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Nexperia datasheet (14 pp, sha256
e6278027e055c1b0, retrieved 2026-10-13, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).