component
1N4738
Public Made by Adomby adom
EIC Semicon Zener Diodes, DO-41. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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1N4738
EIC Semicon · Zener Diodes · DO-41
1N4738 from EIC Semicon, in a DO-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 end of the zener diode, marked by the color band on the DO-41 axial package; the 1N4738 has a nominal Zener voltage of 8.2 V at IZT = 31.0 mA. |
| 2 | A | passive | Anode lead of the zener diode at the end opposite the color band; maximum forward voltage is 1.2 V at IF = 200 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | EIC Semicon |
| Package | DO-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 |
|---|---|---|---|---|---|---|---|
| Nominal Zener Voltage tolerance | VZ | -10 | 10 | % | standard tolerance, no suffix | 2 | |
| Nominal Zener Voltage | VZ | 8.2 | V | @ IZT = 31.0 mA | 2 | ||
| Maximum Zener Impedance | ZZT | 4.5 | Ω | @ IZT = 31.0 mA | 2 | ||
| Maximum Zener Impedance (knee) | ZZK | 700 | Ω | @ IZK = 0.5 mA | 2 | ||
| Maximum Reverse Leakage Current | IR | 10 | µA | @ VR = 6.0 V | 2 | ||
| Maximum DC Zener Current | IZM | 110 | mA | 2 | |||
| Maximum Surge Current | IRM | 550 | mApk | non-repetitive, 8.3ms pulse width square wave superimposed on IZT | 2 | ||
| DC Power Dissipation | PD | 1 | Watt | at TL = 50 °C (Note 1) | 1 | ||
| Maximum Forward Voltage | VF | 1.2 | Volts | at IF = 200 mA | 1 | ||
| Maximum Thermal Resistance Junction to Ambient Air | RӨJA | 170 | K / W | Note 2: leads kept at ambient temperature at 10 mm from case | 1 | ||
| Junction Temperature Range | TJ | -55 | 175 | °C | 1 | ||
| Storage Temperature Range | TSTG | -55 | 175 | °C | 1 | ||
| Test Current | IZT | 31 | mA | 2 |
CAD (KiCad official)
- Symbol:
1N4738 - Footprint:
Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal - 3D model: DO-41 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: EIC Semicon datasheet (2 pp, sha256
50ff1768237efb85, 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).
# 1N4738
**EIC Semicon** · Zener Diodes · DO-41
1N4738 from EIC Semicon, in a DO-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 end of the zener diode, marked by the color band on the DO-41 axial package; the 1N4738 has a nominal Zener voltage of 8.2 V at IZT = 31.0 mA. |
| 2 | A | passive | Anode lead of the zener diode at the end opposite the color band; maximum forward voltage is 1.2 V at IF = 200 mA. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | EIC Semicon |
| Package | DO-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 |
|---|---|---|---|---|---|---|---|
| Nominal Zener Voltage tolerance | VZ | -10 | | 10 | % | standard tolerance, no suffix | 2 |
| Nominal Zener Voltage | VZ | | 8.2 | | V | @ IZT = 31.0 mA | 2 |
| Maximum Zener Impedance | ZZT | | | 4.5 | Ω | @ IZT = 31.0 mA | 2 |
| Maximum Zener Impedance (knee) | ZZK | | | 700 | Ω | @ IZK = 0.5 mA | 2 |
| Maximum Reverse Leakage Current | IR | | | 10 | µA | @ VR = 6.0 V | 2 |
| Maximum DC Zener Current | IZM | | | 110 | mA | | 2 |
| Maximum Surge Current | IRM | | | 550 | mApk | non-repetitive, 8.3ms pulse width square wave superimposed on IZT | 2 |
| DC Power Dissipation | PD | | | 1 | Watt | at TL = 50 °C (Note 1) | 1 |
| Maximum Forward Voltage | VF | | | 1.2 | Volts | at IF = 200 mA | 1 |
| Maximum Thermal Resistance Junction to Ambient Air | RӨJA | | | 170 | K / W | Note 2: leads kept at ambient temperature at 10 mm from case | 1 |
| Junction Temperature Range | TJ | -55 | | 175 | °C | | 1 |
| Storage Temperature Range | TSTG | -55 | | 175 | °C | | 1 |
| Test Current | IZT | | 31 | | mA | | 2 |
## CAD (KiCad official)
- Symbol: `1N4738`
- Footprint: `Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal`
- 3D model: DO-41 (KiCad packages3D, STEP)
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [EIC Semicon datasheet](docs/1n4738-datasheet.pdf) (2 pp, sha256 `50ff1768237efb85`, 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/1n4738-datasheet.pdf)