Taiwan Semiconductor Corporation BZW04-64

Overview

BZW04-64 from Taiwan Semiconductor is a unidirectional transient voltage suppressor diode (TVS) designed for primary overvoltage protection in DC power rails and signal lines. It features a 64.1 V working stand-off voltage, 71.3–78.8 V breakdown voltage at 1 mA, 103 V maximum clamping voltage at 3.9 A peak pulse current, and 400 W peak pulse power rating per 10/1000 μs waveform - deployed in automotive lighting control modules to absorb load-dump transients.

For engineers reviewing the BZW04-64 datasheet, BZW04-64 pinout, BZW04-64 application, or BZW04-64 equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, leakage current below 1 μA at 64.1 V, thermal derating above 25°C ambient, and DO-41 package compatibility with manual or wave-soldered PCB layouts.

Technical Context

The BZW04-64 operates as a silicon avalanche diode with unidirectional polarity, triggered when reverse voltage exceeds its specified breakdown range. Its low dynamic impedance ensures rapid clamping response (<1 ns), and its junction-to-lead thermal resistance of 60 °C/W supports reliable energy dissipation during transient events.

Rated for operation from –55°C to +175°C, it complies with AEC-Q101 stress testing for automotive under-hood applications. The device uses pure tin-plated leads per J-STD-002 and meets UL 94V-0 flammability requirements in its DO-204AL molded package.

Key Specifications

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, epoxy-molded case with cathode band marking for unidirectional polarity. Leads are pure tin-plated and solderable per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ64A and P6KE68A, the BZW04-64 offers tighter V_BR tolerance (±5%), lower leakage (<1 μA), and DO-41 compatibility with existing through-hole manufacturing - making it optimal for cost-sensitive, high-volume automotive modules requiring proven AEC-Q101 qualification path.

Availability

BZW04-64 is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and DC power supply input stage applications requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for BZW04-64 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.

The BZW04 series belongs to TSC's AEC-Q101-qualified TVS diode product line, engineered specifically for robust transient immunity in harsh automotive environments - including under-hood power distribution, lighting, and body electronics.

FAQ

What is the maximum clamping voltage of the BZW04-64 under standard test conditions?

The BZW04-64 has a maximum clamping voltage (V_C) of 103 V when subjected to a 10/1000 μs surge current pulse of 3.9 A. This value is measured per ANSI/IEEE C62.35 and represents the peak voltage across the device during transient suppression - critical for ensuring protected ICs remain within their absolute maximum voltage ratings. The BZW04-64 maintains this clamping performance across its full operating temperature range of –55°C to +175°C.

Is the BZW04-64 suitable for automotive applications requiring AEC-Q101 qualification?

Yes, the BZW04-64H variant is explicitly AEC-Q101 qualified per the manufacturer's ordering code specification. While the base BZW04-64 part number does not carry the "H" suffix, Taiwan Semiconductor confirms that AEC-Q101 qualification applies to the entire BZW04 series when ordered with the "H" designation. For automotive use, specify BZW04-64H to ensure compliance with stress tests including temperature cycling, high-temperature operating life, and ESD robustness.

What is the reverse leakage current of the BZW04-64 at its rated working voltage?

The BZW04-64 exhibits a reverse leakage current (I_R) of less than 1 μA when biased at its working stand-off voltage of 64.1 V. This ultra-low leakage is confirmed in the manufacturer's electrical characteristics table and ensures minimal power loss in always-on circuits such as automotive body control modules. The value holds across the full –55°C to +125°C operating ambient range, supporting reliable low-power design.

How does the DO-41 package of the BZW04-64 affect thermal performance in PCB layouts?

The DO-41 (DO-204AL) package of the BZW04-64 delivers a junction-to-lead thermal resistance (R_θJL) of 60 °C/W and a junction-to-ambient resistance (R_θJA) of 100 °C/W on standard FR-4 with 10 mm lead lengths. To maximize thermal dissipation, designers should use minimum 5 × 5 mm copper pads per lead and avoid excessive trace length - especially in high-reliability automotive applications where sustained surge duty cycles may elevate junction temperature.

Can the BZW04-64 be used in bidirectional protection configurations?

No - the BZW04-64 is a unidirectional TVS diode intended for DC rail protection with defined anode/cathode polarity. For bidirectional protection, the designated variant is BZW04-64B, which features symmetrical breakdown in both directions. Using the BZW04-64 in reverse-biased AC or differential signal paths will result in forward conduction and potential failure. Always match the device suffix (B = bidirectional) to the circuit topology requirement.