BZY55B18

Single Zener Diodes Overview

The BZY55B18 is a surface mount Zener diode from the Taiwan Semiconductor BZY55B series, housed in an 0805 (Ceramics) package. It features a nominal Zener voltage of 18.0 V with a ±2% tolerance range of 17.64 V to 18.36 V. The device operates at a test current of 5 mA and has a maximum power dissipation of 500 mW. Key electrical parameters include a regular impedance of 50 Ω and a leakage current of 0.1 µA at 13.0 V. It supports a junction temperature range of -55 °C to +150 °C.

Single Zener Diodes Feature Summary

• Provides precise voltage regulation with a tight ±2% tolerance on the nominal Zener voltage.
• Utilizes a ceramic-based 0805 surface mount case for enhanced thermal stability and reliability.
• Complies with RoHS standards and meets JESD 201 class 1A whisker test requirements.

Single Zener Diodes Applications

• Low voltage stabilizers or voltage references
• Adapters
• Lighting applications
• On-board DC/DC converter

Single Zener Diodes Procurement Notes

Verify the specific part number BZY55B18 against the official datasheet to confirm the 18V nominal rating and ±2% tolerance. Ensure the required packaging format matches the standard 10,000 units per 13-inch tape and reel configuration. Confirm compliance with moisture sensitivity level 1 per J-STD-020 if applicable to the assembly process.

Single Zener Diodes Selection Notes

Select this component when a stable 18V reference is needed in a compact surface mount footprint. The 0805 ceramic package offers superior thermal performance compared to standard plastic packages. Consider the 500mW power dissipation limit and the 5mA test current requirement for circuit design compatibility.

Single Zener Diodes Part Context

This component belongs to the BZY55B series of surface mount Zener diodes manufactured by Taiwan Semiconductor. The series covers a wide voltage range from 2.4V to 36V, all sharing the same 0805 ceramic package and ±2% tolerance specification. This family is designed for general-purpose voltage regulation and reference applications in consumer and industrial electronics.

Single Zener Diodes Replacement Considerations

Other parts within the BZY55B series (e.g., BZY55B16, BZY55B20) share identical mechanical and thermal characteristics but differ in Zener voltage. Cross-referencing with other manufacturers' 0805 SMD Zener diodes requires verification of pinout polarity, power dissipation ratings, and impedance values.

Single Zener Diodes FAQ

What is the typical Zener impedance for the BZY55B18?

The typical regular Zener impedance (ZZT) for the BZY55B18 is 50 Ω, measured at the test current of 5 mA.

Does the BZY55B18 meet lead-free standards?

Yes, the device is RoHS compliant and features matte tin over nickel terminations.