Taiwan Semiconductor Corporation BZY55B15

Overview

BZY55B15 from Taiwan Semiconductor is a surface-mount Zener diode engineered for precision voltage regulation and reference applications, with a nominal Zener voltage of 15.0 V (±2%), 5 mA test current, 30 Ω dynamic impedance at IZT, 500 mW power dissipation, and operation across –55°C to +150°C junction temperature. It serves in low-voltage stabilizers, on-board DC/DC converters, and lighting control circuits where stable, compact voltage clamping is required.

For engineers reviewing the BZY55B15 datasheet, BZY55B15 pinout, BZY55B15 application, or BZY55B15 equivalent, key selection criteria include its ±2% VZ tolerance, 30 Ω Zener impedance at 5 mA, 0805 ceramic package footprint, 11.0 V reverse leakage threshold, and compatibility with automated SMT assembly under J-STD-020 Level 1 moisture sensitivity.

Technical Context

The BZY55B15 operates as a single-die, unidirectional Zener diode optimized for stable reverse-biased breakdown regulation. Its electrical behavior is defined by a tightly controlled 14.7–15.3 V Zener voltage window at 5 mA, low 30 Ω dynamic impedance (ZZT), and minimal 0.1 µA leakage current at 11.0 V reverse bias.

Thermally, it features a 300 °C/W junction-to-ambient thermal resistance and supports continuous operation up to 150 °C junction temperature. The 0805 ceramic package provides mechanical robustness, UL 94HB flammability compliance, and JESD 201 Class 1A whisker resistance.

Key Specifications

Pinout & Package

Package: 0805 ceramic surface-mount case with cathode band marking. Polarity is unambiguous and aligned with industry-standard orientation for automated optical inspection and placement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode voltage reference applications.

Compared with MMBZ5245B and 1N4744A, the BZY55B15 offers superior ±2% voltage accuracy and SMT-ready 0805 packaging-making it optimal for space-constrained, high-precision, and high-volume production designs where regulation stability and manufacturability are prioritized.

Availability

BZY55B15 is available at Aetrix Electronics and suitable for low-voltage stabilizers, on-board DC/DC converters, and lighting applications requiring stable component supply, tight voltage tolerance, and RoHS-compliant SMT integration.

Supply support for BZY55B15 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, analog ICs, and ESD protection components for industrial, computing, and consumer markets.

The BZY55B series belongs to TSC's precision Zener diode product line, designed specifically for surface-mount voltage reference and regulation in space-constrained, high-reliability power management subsystems.

FAQ

What is the exact Zener voltage range and tolerance for BZY55B15?

The BZY55B15 has a guaranteed Zener voltage range of 14.7 V to 15.3 V at 5 mA test current, corresponding to a ±2% tolerance around the nominal 15.0 V value. This specification is verified per pulse-test conditions (10 ms duration) and applies across the full operating temperature range of –55°C to +150°C. The BZY55B15 maintains this tight tolerance without requiring external calibration or trimming.

What is the maximum power dissipation and thermal resistance of BZY55B15?

The BZY55B15 has a maximum power dissipation (PD) of 500 mW at 25°C ambient, with a junction-to-ambient thermal resistance (RθJA) of 300 °C/W. Derating is required above 25°C per the admissible power dissipation curve - e.g., at 75°C ambient, max PD drops to ~333 mW. Its 0805 ceramic package enables efficient heat transfer in standard PCB layouts with minimal copper area.

Does BZY55B15 have moisture sensitivity, and what is its J-STD-020 level?

Yes, the BZY55B15 is rated at J-STD-020 Moisture Sensitivity Level 1, meaning it may be stored indefinitely at ≤30°C/60% RH without baking prior to reflow soldering. This eliminates pre-conditioning steps in SMT lines, reducing process complexity and cost. The device's ceramic package and conformal molding contribute to this robust moisture performance.

What is the reverse leakage current specification for BZY55B15, and at what voltage is it measured?

The BZY55B15 exhibits a maximum reverse leakage current (IR) of 0.1 µA when biased at 11.0 V - a voltage intentionally set below its 14.7 V minimum Zener onset. This ultra-low leakage ensures minimal parasitic loading on high-impedance reference nodes, preserving accuracy in precision analog circuits and extending battery life in portable systems using the BZY55B15.

Is BZY55B15 RoHS compliant and halogen-free?

Yes, the BZY55B15 is fully RoHS compliant per EU Directive 2011/65/EU and meets JEDEC JS709E halogen-free requirements (<900 ppm bromine, <900 ppm chlorine, total halogens <1500 ppm). The molding compound and metallization systems used in its 0805 ceramic package have been validated for environmental compliance without compromising electrical or thermal performance.