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BZX79-B43
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Nexperia Zener Diodes, DO-204AH(DO-35). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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BZX79-B43
Nexperia · Zener Diodes · DO-204AH(DO-35)
BZX79-B43 from Nexperia, in a DO-204AH(DO-35). 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, marked by the marking band on the package (the datasheet notes the band indicates the cathode); continuous forward current is limited to 250 mA. |
| 2 | A | passive | Anode (symbol 'a' in Fig.1); the device is rated for a continuous forward current of 250 mA and a non-repetitive peak reverse power dissipation of 40 W (tp = 100 µs). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | DO-204AH(DO-35) |
| 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 |
|---|---|---|---|---|---|---|---|
| Continuous forward current | IF | 250 | mA | 3 | |||
| Non-repetitive peak reverse current (B43) | IZSM | 0.6 | A | tp = 100 μs; Tamb = 25 °C | 6 | ||
| Non-repetitive peak reverse power dissipation | PZSM | 40 | W | tp = 100 μs; square wave; Tj = 25 °C prior to surge; see Fig.3 | 3 | ||
| Total power dissipation | Ptot | 400 | mW | Tamb = 50 °C; note 1 | 3 | ||
| Total power dissipation | Ptot | 500 | mW | Tamb = 50 °C; note 2 | 3 | ||
| Storage temperature | Tstg | -65 | 200 | °C | 3 | ||
| Junction temperature | Tj | -65 | 200 | °C | 3 | ||
| Forward voltage | VF | 0.9 | V | IF = 10 mA; see Fig.4 | 3 | ||
| Reverse current (BZX79-B/C15 to BZX79-B/C75) | IR | 50 | nA | VR = 0.7VZnom | 4 | ||
| Working voltage (Tol. ±2%, B) | VZ | 42.1 | 43.9 | V | at IZtest = 2 mA | 6 | |
| Differential resistance | rdif | 85 | 375 | Ω | at IZtest = 0.5 mA | 6 | |
| Differential resistance | rdif | 45 | 150 | Ω | at IZtest = 2 mA | 6 | |
| Temperature coefficient | SZ | 31.4 | 38.8 | 46.6 | mV/K | at IZtest = 2 mA; see Figs 5 and 6 | 6 |
| Diode capacitance | Cd | 40 | pF | f = 1 MHz; VR = 0 V | 6 | ||
| Thermal resistance junction to tie-point | Rth j-tp | 300 | K/W | lead length 8 mm | 7 | ||
| Thermal resistance junction to ambient | Rth j-a | 380 | K/W | lead length max.; see Fig.2 and note 1 | 7 |
CAD (KiCad official)
- Symbol:
BZX79-B43 - Footprint:
Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal - 3D model: DO-204AH(DO-35) (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Nexperia datasheet (11 pp, sha256
5d6ced72e738abc2, retrieved 2026-10-21, tier: manufacturer) - 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).
# BZX79-B43
**Nexperia** · Zener Diodes · DO-204AH(DO-35)
BZX79-B43 from Nexperia, in a DO-204AH(DO-35). 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, marked by the marking band on the package (the datasheet notes the band indicates the cathode); continuous forward current is limited to 250 mA. |
| 2 | A | passive | Anode (symbol 'a' in Fig.1); the device is rated for a continuous forward current of 250 mA and a non-repetitive peak reverse power dissipation of 40 W (tp = 100 µs). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | DO-204AH(DO-35) |
| 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 |
|---|---|---|---|---|---|---|---|
| Continuous forward current | IF | | | 250 | mA | | 3 |
| Non-repetitive peak reverse current (B43) | IZSM | | | 0.6 | A | tp = 100 μs; Tamb = 25 °C | 6 |
| Non-repetitive peak reverse power dissipation | PZSM | | | 40 | W | tp = 100 μs; square wave; Tj = 25 °C prior to surge; see Fig.3 | 3 |
| Total power dissipation | Ptot | | | 400 | mW | Tamb = 50 °C; note 1 | 3 |
| Total power dissipation | Ptot | | | 500 | mW | Tamb = 50 °C; note 2 | 3 |
| Storage temperature | Tstg | -65 | | 200 | °C | | 3 |
| Junction temperature | Tj | -65 | | 200 | °C | | 3 |
| Forward voltage | VF | | | 0.9 | V | IF = 10 mA; see Fig.4 | 3 |
| Reverse current (BZX79-B/C15 to BZX79-B/C75) | IR | | | 50 | nA | VR = 0.7VZnom | 4 |
| Working voltage (Tol. ±2%, B) | VZ | 42.1 | | 43.9 | V | at IZtest = 2 mA | 6 |
| Differential resistance | rdif | | 85 | 375 | Ω | at IZtest = 0.5 mA | 6 |
| Differential resistance | rdif | | 45 | 150 | Ω | at IZtest = 2 mA | 6 |
| Temperature coefficient | SZ | 31.4 | 38.8 | 46.6 | mV/K | at IZtest = 2 mA; see Figs 5 and 6 | 6 |
| Diode capacitance | Cd | | | 40 | pF | f = 1 MHz; VR = 0 V | 6 |
| Thermal resistance junction to tie-point | Rth j-tp | | | 300 | K/W | lead length 8 mm | 7 |
| Thermal resistance junction to ambient | Rth j-a | | | 380 | K/W | lead length max.; see Fig.2 and note 1 | 7 |
## CAD (KiCad official)
- Symbol: `BZX79-B43`
- Footprint: `Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal`
- 3D model: DO-204AH(DO-35) (KiCad packages3D, STEP)
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Nexperia datasheet](https://assets.nexperia.com/documents/data-sheet/BZX79-B43.pdf) (11 pp, sha256 `5d6ced72e738abc2`, retrieved 2026-10-21, tier: manufacturer)
- **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/bzx79-b43-datasheet.pdf)