Taiwan Semiconductor Corporation BZY55B15 RBG

Overview

BZY55B15 RBG from Taiwan Semiconductor is a surface-mount 15 V ±2% Zener diode in 0805 ceramic package, rated for 500 mW power dissipation and 5 mA test current, with 30 Ω dynamic impedance at I_ZT, used for precision voltage reference and low-voltage stabilization in DC/DC converters and lighting circuits.

For engineers reviewing the BZY55B15 RBG datasheet, BZY55B15 RBG pinout, BZY55B15 RBG application, or BZY55B15 RBG equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (300 °C/W), junction temperature range (–55 to +150 °C), cathode band polarity marking, and RoHS-compliant 0805 ceramic packaging suitable for automated SMT assembly.

Technical Context

The BZY55B15 RBG operates as a single-die, silicon-based Zener diode optimized for stable reverse-breakdown regulation at 15.0 V nominal with tight ±2% tolerance. It delivers 30 Ω Zener impedance at 5 mA test current and maintains <0.1 µA leakage at 11.0 V reverse bias.

Designed for surface-mount reliability, it meets JESD201 Class 1A whisker resistance, J-STD-020 Moisture Sensitivity Level 1, and UL 94HB flammability rating - all verified under standard 25 °C ambient conditions unless otherwise specified.

Key Specifications

Pinout & Package

Package: 0805 ceramic case (EIA 0805 / IEC 2012), polarity indicated by cathode band; weight ≈ 5.99 mg.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5245B-7-F and 1N4744A, the BZY55B15 RBG offers tighter ±2% tolerance, smaller 0805 footprint, lower leakage, and J-STD-020 Level 1 handling - making it optimal for space-constrained, high-precision SMT voltage reference designs requiring long-term stability and manufacturability.

Availability

BZY55B15 RBG is available at Aetrix Electronics and suitable for low-voltage stabilizers, on-board DC/DC converters, lighting applications, and adapter designs requiring stable component supply with full traceability and lifecycle management.

Supply support for BZY55B15 RBG 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 protection components for industrial and consumer markets.

The BZY55B15 RBG belongs to TSC's BZY55B series of precision Zener diodes, engineered specifically for high-reliability, surface-mount voltage reference and stabilization in space-constrained power management systems.

FAQ

What is the nominal Zener voltage and tolerance of the BZY55B15 RBG?

The BZY55B15 RBG has a nominal Zener voltage of 15.0 V with a guaranteed tolerance of ±2%, meaning its actual breakdown voltage falls between 14.7 V and 15.3 V when tested at 5 mA (I_ZT). This tight tolerance is confirmed per the manufacturer's electrical specifications table and supports precision voltage referencing in analog and power circuits where regulation accuracy is critical. The BZY55B15 RBG achieves this performance using silicon die processing controls validated across production lots.

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

The BZY55B15 RBG is rated for 500 mW maximum power dissipation at 25 °C ambient temperature, with a junction-to-ambient thermal resistance (R_θJA) of 300 °C/W. This means that under continuous DC operation, the junction temperature rises by 300 °C per watt dissipated - so at full 500 mW, the rise is 150 °C above ambient. The BZY55B15 RBG is therefore limited to ambient temperatures ≤0 °C for full-rated power, but remains functional up to +150 °C junction temperature across its specified –55 to +150 °C operating range.

Does the BZY55B15 RBG have a defined polarity marking, and how is it identified?

Yes, the BZY55B15 RBG uses a cathode band to indicate polarity - a visible dark band printed on the ceramic body near one end, corresponding to the cathode terminal. This marking aligns with industry-standard orientation for 0805 Zener diodes and ensures correct placement during automated pick-and-place assembly. The BZY55B15 RBG's cathode must be connected to the higher-potential node in reverse-bias configuration to achieve Zener breakdown and voltage regulation; reversing polarity results in forward conduction (~1.5 V drop) instead of regulation.

Is the BZY55B15 RBG RoHS compliant and moisture-sensitive?

Yes, the BZY55B15 RBG is RoHS compliant and classified as Moisture Sensitivity Level 1 per J-STD-020 - the least sensitive level, meaning it can be stored indefinitely at ≤30 °C/60% RH without baking prior to reflow soldering. This eliminates pre-conditioning steps in SMT lines and reduces process complexity. The BZY55B15 RBG's compliance is documented in the manufacturer's mechanical data section and supported by material declarations available from Taiwan Semiconductor's official product documentation.

What is the Zener impedance and leakage current specification for the BZY55B15 RBG?

The BZY55B15 RBG exhibits a Zener impedance (Z_ZT) of 30 Ω at the 5 mA test current (I_ZT), indicating low dynamic resistance for stable regulation under varying load currents. Its reverse leakage current is ≤0.1 µA at 11.0 V (73% of V_Z), confirming sharp knee characteristics and minimal quiescent loss in standby mode. These values are measured per standard pulse-test methodology and are consistent across the BZY55B15 RBG's qualified production lots as published in the Electrical Specifications table.