Taiwan Semiconductor Corporation BZW04-8V5

Overview

BZW04-8V5 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 8.55 V working stand-off voltage, 9.50–10.5 V breakdown voltage at 1 mA test current, 14.5 V maximum clamping voltage at 27.6 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 BZW04-8V5 datasheet, BZW04-8V5 pinout, BZW04-8V5 application, or BZW04-8V5 equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, leakage current at operating voltage, thermal derating above 25°C ambient, and DO-41 package compatibility with existing PCB footprints and reflow profiles.

Technical Context

The BZW04-8V5 operates as a silicon avalanche diode with sharp reverse-breakdown knee and low dynamic impedance during surge events. Its 14.5 V clamping voltage at 27.6 A ensures robust protection of 12 V automotive electronics while maintaining safe margin below typical 16 V system-level surge limits.

It exhibits <10 µA reverse leakage at 8.55 V (V_WM) and a temperature coefficient of +0.073 %/°C for V_BR, enabling stable performance across –55°C to +175°C junction temperature range - critical for under-hood applications where thermal drift must be predictable.

Key Specifications

Pinout & Package

Package: DO-204AL (DO-41), axial leaded, epoxy-molded case with cathode band marking. RoHS-compliant, halogen-free, UL 94V-0 rated molding compound; pure tin-plated leads meet J-STD-002 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ8.5A and P6KE8.5A, the BZW04-8V5 offers optimal balance of DO-41 footprint compatibility, 10 µA leakage, and AEC-Q101 qualification path - making it preferred for new automotive PCB designs requiring drop-in manufacturability and thermal performance in constrained spaces.

Availability

BZW04-8V5 is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and body control module designs requiring stable component supply, AEC-Q101 traceability, and DO-41 package consistency.

Supply support for BZW04-8V5 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, rectifiers, and thyristors - headquartered in Hsinchu, Taiwan.

The BZW04 series was engineered specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing low clamping ratio, wide temperature operation, and AEC-Q101 compliance readiness.

FAQ

What is the maximum clamping voltage of the BZW04-8V5 under standard surge conditions?

The BZW04-8V5 has a maximum clamping voltage (V_C) of 14.5 V when subjected to a 27.6 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 16 V-tolerant automotive ICs. The BZW04-8V5 maintains this clamping performance across its full operating temperature range.

Is the BZW04-8V5 unidirectional or bidirectional, and how is polarity identified?

The BZW04-8V5 is a unidirectional TVS diode, intended for DC line protection where polarity is fixed. Polarity is marked by a cathode band on the DO-41 package body - the banded end connects to the higher-potential side (e.g., 12 V rail), while the unbanded end connects to ground. Bidirectional variants (e.g., BZW04-8V5B) exist but are distinct orderable parts; the BZW04-8V5 itself is strictly unidirectional.

Does the BZW04-8V5 meet AEC-Q101 qualification requirements?

The base BZW04-8V5 is not automatically AEC-Q101 qualified; however, the AEC-Q101 variant is available as BZW04-8V5H (with "H" suffix in ordering code). This version undergoes full stress testing per AEC-Q101 Rev D, including HTGB, HTRB, and temperature cycling. For automotive production, specify BZW04-8V5H to ensure qualification - the BZW04-8V5 without suffix is suitable for industrial applications where qualification is not mandated.

What is the reverse leakage current of the BZW04-8V5 at its working stand-off voltage?

At its specified working stand-off voltage (V_WM) of 8.55 V and ambient temperature of 25°C, the BZW04-8V5 exhibits a maximum reverse leakage current (I_R) of 10 µA. This low leakage ensures minimal impact on battery-powered or always-on circuits, such as automotive body control modules or IoT sensor nodes. Leakage remains within specification across the full –55°C to +125°C operating ambient range.

Can the BZW04-8V5 be used in place of the P6KE8.5A in an existing design?

The BZW04-8V5 shares the same V_WM (8.55 V) and similar clamping (14.5 V vs. 15.0 V) as the P6KE8.5A, but uses a DO-41 package versus DO-15 - differing in body diameter and lead spacing. While both are axial-leaded, mechanical fit requires verification of PCB footprint and lead bend radius. Electrically, the BZW04-8V5 offers lower leakage (10 µA vs. ~25 µA), making it preferable for low-power applications; however, direct substitution should include thermal and layout validation. The BZW04-8V5 is not a guaranteed drop-in replacement for P6KE8.5A.