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DL5239B
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YONGYUTAI Zener Diodes, LL-34. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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DL5239B
YONGYUTAI · Zener Diodes · LL-34
DL5239B from YONGYUTAI, in a LL-34. 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; Zener voltage 9.1 V nominal at IZT=20 mA for the DL5239B (±5% tolerance, B suffix). |
| 2 | A | passive | Anode end of the MINI MELF glass body with plated leads; polarity is indicated by the color band on the cathode end, and forward voltage is 1.1 V max at IF=200 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | YONGYUTAI |
| Package | LL-34 |
| 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 (suffix B) | -5 | 5 | % | Suffix B indicates ±5% tolerance | 2 | ||
| Power dissipation | Ptot | 500 | mW | Tamb=25 C (Note 1) | 1 | ||
| Junction temperature | Tj | 200 | C | 1 | |||
| Storage temperature range | TSTG | -65 | 200 | C | 1 | ||
| Thermal resistance junction to ambient | RθJA | 0.3 | K/mW | Note 1: leads at 10mm from case kept at ambient temperature | 1 | ||
| Forward voltage | VF | 1.1 | V | IF=200mA | 1 | ||
| Maximum zener impedance | ZZT | 10 | Ohms | @IZT | 2 | ||
| Maximum zener impedance (knee) | ZZK | 600 | Ohms | @IZK=0.25mA | 2 | ||
| Maximum reverse leakage current | IR | 3 | µA | @VR=7.0 V | 2 | ||
| Maximum regulator current | IZM | 50 | mA | 2 | |||
| Nominal zener voltage | VZ | 9.1 | V | @IZT, TA=25 C | 2 | ||
| Test current | IZT | 20 | mA | TA=25 C | 2 | ||
| Typical temperature coefficient | 0.068 | %/ C | 2 | ||||
| Reverse voltage for leakage test | VR | 7 | V | IR test voltage | 2 |
CAD (KiCad official)
- Symbol:
DL5239B - Footprint:
Diode_SMD:D_MiniMELF - 3D model: LL-34 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: YONGYUTAI datasheet (3 pp, sha256
d741924a98eeecea, 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).
# DL5239B
**YONGYUTAI** · Zener Diodes · LL-34
DL5239B from YONGYUTAI, in a LL-34. 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; Zener voltage 9.1 V nominal at IZT=20 mA for the DL5239B (±5% tolerance, B suffix). |
| 2 | A | passive | Anode end of the MINI MELF glass body with plated leads; polarity is indicated by the color band on the cathode end, and forward voltage is 1.1 V max at IF=200 mA. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | YONGYUTAI |
| Package | LL-34 |
| 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 (suffix B) | | -5 | | 5 | % | Suffix B indicates ±5% tolerance | 2 |
| Power dissipation | Ptot | | | 500 | mW | Tamb=25 C (Note 1) | 1 |
| Junction temperature | Tj | | | 200 | C | | 1 |
| Storage temperature range | TSTG | -65 | | 200 | C | | 1 |
| Thermal resistance junction to ambient | RθJA | | | 0.3 | K/mW | Note 1: leads at 10mm from case kept at ambient temperature | 1 |
| Forward voltage | VF | | | 1.1 | V | IF=200mA | 1 |
| Maximum zener impedance | ZZT | | | 10 | Ohms | @IZT | 2 |
| Maximum zener impedance (knee) | ZZK | | | 600 | Ohms | @IZK=0.25mA | 2 |
| Maximum reverse leakage current | IR | | | 3 | µA | @VR=7.0 V | 2 |
| Maximum regulator current | IZM | | | 50 | mA | | 2 |
| Nominal zener voltage | VZ | | 9.1 | | V | @IZT, TA=25 C | 2 |
| Test current | IZT | | 20 | | mA | TA=25 C | 2 |
| Typical temperature coefficient | | | 0.068 | | %/ C | | 2 |
| Reverse voltage for leakage test | VR | | 7 | | V | IR test voltage | 2 |
## CAD (KiCad official)
- Symbol: `DL5239B`
- Footprint: `Diode_SMD:D_MiniMELF`
- 3D model: LL-34 (KiCad packages3D, STEP)
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [YONGYUTAI datasheet](docs/dl5239b-datasheet.pdf) (3 pp, sha256 `d741924a98eeecea`, 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/dl5239b-datasheet.pdf)