Taiwan Semiconductor Corporation BZW04-48

Overview

BZW04-48 from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power rails and signal lines. It features a 47.8 V working stand-off voltage, 53.2–58.8 V breakdown voltage at 1 mA, 77.0 V maximum clamping voltage at 5.2 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive lighting control and industrial sensor interface circuits.

For engineers reviewing the BZW04-48 datasheet, BZW04-48 pinout, BZW04-48 application, or BZW04-48 equivalent, key selection criteria include clamping voltage margin relative to protected IC V_DD, leakage current below 1 µA at 47.8 V, DO-41 package thermal performance (R_θJA = 100 °C/W), and AEC-Q101 qualification status for automotive-grade reliability validation.

Technical Context

The BZW04-48 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its 53.2–58.8 V breakdown range under 1 mA test current. Its low dynamic impedance enables rapid clamping response (<1 ns) to EFT and lightning-induced transients.

It sustains 400 W non-repetitive surge energy at 25 °C with derating above ambient temperature per Fig.2, and exhibits 0.103 %/°C V_BR temperature coefficient - critical for stable clamping across -55 °C to +175 °C junction operation.

Key Specifications

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, epoxy-molded case with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SMBJ48A and P6KE48A, the BZW04-48 offers AEC-Q101 qualification in the cost-effective DO-41 package, balanced clamping performance (77.0 V), and superior thermal management (R_θJA = 100 °C/W) - making it optimal for volume automotive and industrial 48 V systems requiring long-term reliability validation.

Availability

BZW04-48 is available at Aetrix Electronics and suitable for automotive lighting control, industrial 48 V sensor interfaces, and telecom power supply inputs requiring stable component supply, traceable sourcing, and lifecycle continuity support.

Supply support for BZW04-48 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, TVS diodes, and rectifiers with global distribution and AEC-Q101 certification capability.

The BZW04 series is part of TSC's automotive-grade TVS portfolio, engineered specifically for robust transient suppression in 12 V to 48 V automotive and industrial power systems - emphasizing low leakage, precise V_BR tolerance, and high-temperature reliability.

FAQ

What is the maximum clamping voltage of the BZW04-48 under standard surge conditions?

The BZW04-48 has a maximum clamping voltage (V_C) of 77.0 V when subjected to a 10/1000 µs surge waveform with a peak current (I_PP) of 5.2 A. This value is measured per ANSI/IEEE C62.35 standards and ensures reliable protection for 60–85 V-rated downstream components. The BZW04-48 maintains this clamping performance across its full operating temperature range from -55 °C to +175 °C.

Is the BZW04-48 available in an AEC-Q101 qualified version?

Yes, the BZW04-48H variant is AEC-Q101 qualified and marked with "H" in the ordering code. This qualification confirms compliance with stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing - making the BZW04-48H suitable for automotive powertrain and body electronics. Standard BZW04-48 is not AEC-Q101 qualified unless ordered as BZW04-48H.

What is the reverse leakage current specification for the BZW04-48 at its working voltage?

The BZW04-48 specifies a maximum reverse leakage current (I_R) of 1 µA when biased at its working stand-off voltage (V_WM) of 47.8 V. This ultra-low leakage minimizes power loss in always-on circuits and preserves signal integrity in high-impedance sensor interfaces. Measured at 25 °C, leakage remains well below 5 µA across the full -55 °C to +125 °C ambient range.

Which package type does the BZW04-48 use, and what are its mechanical highlights?

The BZW04-48 uses the DO-204AL (DO-41) axial-leaded package with epoxy molding rated UL 94V-0. Its leads are pure tin-plated and compliant with J-STD-002 solderability requirements. The device weighs approximately 0.300 g and meets JESD 201 Class 2 whisker resistance. Polarity is indicated by a cathode band, and the package supports mounting on 5 × 5 mm copper pads for optimal thermal dissipation.

How does the BZW04-48 compare to the BZW04-48B bidirectional variant?

The BZW04-48 is unidirectional, while BZW04-48B is bidirectional - meaning the latter clamps in both polarities and lacks anode/cathode distinction. The BZW04-48 provides lower leakage and sharper turn-on for DC rail protection, whereas BZW04-48B suits AC-coupled or floating signal lines. Both share identical V_WM (47.8 V), V_BR (53.2–58.8 V), and V_C (77.0 V) specs, but BZW04-48B exhibits symmetric clamping behavior essential for differential bus protection like RS-485.