Zener Diode 18V 1W

Description

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 Datasheet

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