Zener Diode 18V 1W
The 18V 1W Zener diode (JEDEC type 1N4746A) is a silicon voltage-regulation diode designed to maintain a stable 18-volt reference under varying current and voltage conditions. Encapsulated in a DO-41 plastic package, it delivers reliable one-watt power dissipation and is intended for use where compact, low-cost voltage stabilization is required.
At its nominal test current of 14 mA the diode exhibits a tightly defined breakdown voltage and low dynamic resistance (20 Ω), enabling predictable regulation over a range of operating currents. It tolerates moderate surge currents (rated 250 mA) and shows low reverse leakage (about 5 µA at the specified test voltage), while its thermal characteristics (45 °C/W junction-to-lead) recommend basic thermal management when mounted on circuit boards.
Built to JEDEC standards and moisture-classified for simple handling, the part operates across a wide temperature span (−65 °C to +150 °C) and is available with military screening and tape-and-reel options for production assembly. Its simple axial-leaded form factor, standard marking, and small mass (≈0.7 g) make it straightforward to integrate into prototypes and production assemblies requiring an 18 V reference. Forward voltage is specified around 1.2 V at 200 mA, and the part’s consistent electrical characteristics simplify circuit design and production testing. and long-term reliability gains.
Features:
- JEDEC registered types.
- 1.0 watt steady-state power dissipation.
- Wide voltage selection (3.3 V to 100 V) — 18 V available.
- Moisture classification Level 1 (no dry pack required).
- Options for MIL-PRF-19500 screening (JAN/JANTX/JANTXV/JANS) available.
- Surface-mount equivalents available.
- Low dynamic impedance at test current (good regulation).
- Low reverse leakage current.
- Axial-lead DO-41 plastic package, standard marking.
- Tape & reel option available (add “TR” suffix).
Specifications:
| Parameter | Value |
|---|---|
| JEDEC type: | 1N4746A |
| Zener voltage (Vz): | 18 V |
| Test current (IZT): | 14 mA |
| Max dynamic impedance (ZZT @ IZT): | 20 Ω |
| Max reverse current (IR @ VR): | 5 µA |
| Test voltage (VR): | 13.7 V |
| Max regulator current (IZM): | 50 mA |
| Max knee impedance (ZZK @ IZK): | 750 Ω |
| Knee test current (IZK): | 0.25 mA |
| Max surge current (IS): | 250 mA |
| Power dissipation (Ta = 25 °C): | 1.0 W |
| Operating & storage temperature: | −65 °C to +150 °C |
| Thermal resistance (θJL): | 45 °C/W |
| Forward voltage @200 mA: | 1.2 V (max) |
| Case / Package: | DO-41 |
| Weight: | ≈ 0.7 g |
Applications:
- Voltage regulation.
- Voltage reference.
- Surge / transient suppression.
- Clipping and waveform shaping.
- General-purpose power supply protection.
Package Include:
- 1x Zener Diode 18V 1W
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