Taiwan Semiconductor Corporation BZW06-128BH

Overview

BZW06-128BH from Taiwan Semiconductor is a unidirectional 600W transient voltage suppressor (TVS) diode with 128V working stand-off voltage, 143–158V breakdown range at 1mA, and 207V clamping voltage at 2.9A (10/1000μs). It features AEC-Q101 qualification, low dynamic impedance, and sub-1ps response time for automotive-grade ESD and surge protection in power supply rails and signal lines.

For engineers reviewing the BZW06-128BH datasheet, BZW06-128BH pinout, BZW06-128BH application, or BZW06-128BH equivalent, key selection criteria include its DO-204AC (DO-15) package, unidirectional polarity, 175°C max junction temperature, and compliance with IEC 61249-2-21 halogen-free requirements - critical for automotive electronics and industrial power systems.

Technical Context

The BZW06-128BH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR (143–158V), clamping transients to ≤207V at 2.9A. Its low dynamic impedance ensures effective energy diversion during fast-rising EFT or lightning-induced surges.

Designed for high-reliability environments, it supports continuous operation from −55°C to +175°C, with thermal resistance R_θJL = 60°C/W and R_θJA = 100°C/W (L = 10mm), enabling robust thermal management in constrained PCB layouts without forced cooling.

Key Specifications

Pinout & Package

Package: DO-204AC (DO-15), axial leaded, epoxy-molded case with cathode band marking for unidirectional polarity. 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 SMBJ128A and P6SMB128A, the BZW06-128BH provides verified AEC-Q101 qualification, DO-204AC axial leads for through-hole reliability, and tighter VBR tolerance (143–158V vs. 142–158V), making it the preferred choice for automotive Tier-1 power rail protection where process control and long-term stability are critical.

Availability

BZW06-128BH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC input conditioning, and LED driver overvoltage clamping requiring stable component supply and full AEC-Q101 compliance.

Supply support for BZW06-128BH 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 MOSFETs, with global distribution and AEC-Q101-qualified product lines.

The BZW06 series was developed specifically for high-energy transient suppression in automotive and industrial power systems, emphasizing ruggedness, thermal stability, and consistent clamping performance across temperature extremes.

FAQ

What is the polarity configuration of the BZW06-128BH?

The BZW06-128BH is a unidirectional TVS diode, with cathode marked by a band on the DO-204AC package. It conducts only during reverse overvoltage events - forward bias behaves like a standard silicon diode (~1V drop). This polarity enables precise clamping on positive-going transients in grounded-system architectures, and the BZW06-128BH must be oriented with cathode toward the protected line.

Does the BZW06-128BH meet AEC-Q101 requirements for automotive use?

Yes, the "H" suffix in BZW06-128BH explicitly denotes AEC-Q101 qualification per Rev-K2105 documentation. It has passed stress tests including HTGB, HTRB, TCT, and mechanical shock per AEC-Q101-004, making the BZW06-128BH suitable for under-hood and body-control module applications without additional qualification.

What is the maximum peak pulse current the BZW06-128BH can handle?

The BZW06-128BH handles up to 2.9A peak pulse current under the 10/1000μs waveform at 207V clamping voltage. For the 8/20μs waveform, it supports 15A at 265V. These values are measured per JEDEC standards and define the absolute limits for single-event surge absorption - repeated exposure above these levels risks parametric shift or failure of the BZW06-128BH.

How does the BZW06-128BH compare to bidirectional variants like BZW06-128BH?

The BZW06-128BH is unidirectional; there is no bidirectional variant with identical part number. Bidirectional versions (e.g., BZW06-128BH is not valid; correct is BZW06-128B) have symmetric breakdown in both directions and no polarity marking. The BZW06-128BH requires correct orientation on PCB, whereas BZW06-128B protects AC lines or differential signals without polarity concern - but sacrifices ~10% clamping efficiency due to dual-junction architecture.

What is the thermal resistance profile of the BZW06-128BH in standard mounting?

Per datasheet Rev-K2105, the BZW06-128BH exhibits R_θJL = 60°C/W (junction-to-lead) and R_θJA = 100°C/W (junction-to-ambient, with 10mm lead length). These values assume standard DO-204AC mounting on FR-4 with 0.5-inch copper pour; reducing trace width or eliminating thermal pads increases R_θJA, potentially derating the BZW06-128BH's 600W capability in compact designs.