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ZM4739A
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YONGYUTAI Zener Diodes, LL-41. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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ZM4739A
YONGYUTAI · Zener Diodes · LL-41
ZM4739A from YONGYUTAI, in a LL-41. 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 color band; the Zener voltage of ZM4739A is 9.1V nominal at Iz=28mA with ±5% tolerance. |
| 2 | A | passive | Anode, the end opposite the color band; power dissipation is 1000mW and operating junction temperature is 175℃. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | YONGYUTAI |
| Package | LL-41 |
| 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 tolerance | Vz | -5 | 5 | % | Tolerance on nominal Vz value (A suffix) | 2 | |
| Reverse Current | Ir | 10 | uA | Vr=7.0 V | 1 | ||
| Dynamic Resistance | rd | 5 | Ω | Iz=28.0 mA | 1 | ||
| Forward Voltage | VF | 1.2 | V | IF=200mA | 2 | ||
| Power Dissipation | Pd | 1000 | mW | TA = 25℃ | 1 | ||
| Operating junction temperature | Tj | 175 | ℃ | 1 | |||
| Storage temperature range | Ts | -65 | 150 | ℃ | 1 | ||
| Nominal Zener Voltage | Vz | 9.1 | V | Iz=28.0 mA | 1 |
CAD (KiCad official)
- Symbol:
ZM4739A - Footprint:
Diode_SMD:D_MELF - 3D model: LL-41 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: YONGYUTAI datasheet (3 pp, sha256
0d91ba5715a489d2, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).
# ZM4739A
**YONGYUTAI** · Zener Diodes · LL-41
ZM4739A from YONGYUTAI, in a LL-41. 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 color band; the Zener voltage of ZM4739A is 9.1V nominal at Iz=28mA with ±5% tolerance. |
| 2 | A | passive | Anode, the end opposite the color band; power dissipation is 1000mW and operating junction temperature is 175℃. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | YONGYUTAI |
| Package | LL-41 |
| 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 tolerance | Vz | -5 | | 5 | % | Tolerance on nominal Vz value (A suffix) | 2 |
| Reverse Current | Ir | | | 10 | uA | Vr=7.0 V | 1 |
| Dynamic Resistance | rd | | | 5 | Ω | Iz=28.0 mA | 1 |
| Forward Voltage | VF | | | 1.2 | V | IF=200mA | 2 |
| Power Dissipation | Pd | | | 1000 | mW | TA = 25℃ | 1 |
| Operating junction temperature | Tj | | | 175 | ℃ | | 1 |
| Storage temperature range | Ts | -65 | | 150 | ℃ | | 1 |
| Nominal Zener Voltage | Vz | | 9.1 | | V | Iz=28.0 mA | 1 |
## CAD (KiCad official)
- Symbol: `ZM4739A`
- Footprint: `Diode_SMD:D_MELF`
- 3D model: LL-41 (KiCad packages3D, STEP)
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [YONGYUTAI datasheet](docs/zm4739a-datasheet.pdf) (3 pp, sha256 `0d91ba5715a489d2`, retrieved 2026-10-22, tier: lcsc)
- **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/zm4739a-datasheet.pdf)