Taiwan Semiconductor Corporation BZW06-256H

Overview

BZW06-256H from Taiwan Semiconductor is a unidirectional 600W transient voltage suppressor (TVS) diode with a 256V working stand-off voltage, 285–315V breakdown range at 1mA, and 414V clamping voltage at 1.6A (10/1000μs). It features AEC-Q101 qualification, low dynamic impedance, and sub-1ps response time, deployed for automotive ESD and inductive load protection.

For engineers reviewing the BZW06-256H datasheet, BZW06-256H pinout, BZW06-256H application, or BZW06-256H equivalent, key selection criteria include its DO-204AC (DO-15) package, AEC-Q101 compliance, 175°C max junction temperature, and verified clamping performance under 10/1000μs surge waveforms.

Technical Context

The BZW06-256H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (285–315V), clamping transients to ≤414V at 1.6A. Its low dynamic impedance ensures minimal voltage overshoot during fast transients, while the 1.7W steady-state power rating supports continuous leakage management at elevated ambient temperatures.

Designed for automotive-grade reliability, it meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements. The device exhibits a temperature coefficient of 0.110%/°C for VBR and maintains <1μA reverse leakage above 10V, enabling stable operation across –55°C to +175°C junction range.

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 and solderable per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ250A and P6SMB250A, the BZW06-256H provides verified AEC-Q101 qualification, DO-204AC mechanical robustness for vibration-prone environments, and documented 175°C operation-critical for under-hood automotive integration where alternatives lack traceable automotive stress validation.

Availability

BZW06-256H is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and LED lighting surge resilience requiring stable component supply and long-term lifecycle assurance.

Supply support for BZW06-256H 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 BZW06 series belongs to TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for harsh-environment transient suppression in automotive power distribution, body electronics, and chassis systems.

FAQ

What is the maximum clamping voltage of the BZW06-256H under standard 10/1000μs surge conditions?

The BZW06-256H has a maximum clamping voltage (VC) of 414V at 1.6A under the 10/1000μs waveform, as specified in the manufacturer's electrical characteristics table. This value ensures predictable overvoltage limiting for downstream components. The BZW06-256H achieves this clamping performance while maintaining low dynamic impedance and sub-1ps response time, making it suitable for protecting sensitive automotive electronics against load dump and ESD events.

Is the BZW06-256H suitable for automotive applications?

Yes, the BZW06-256H is explicitly AEC-Q101 qualified, with validation across high-temperature operating life, temperature cycling, unbiased highly accelerated stress testing, and whisker resistance (JESD201 Class 2). Its –55°C to +175°C operating junction range and UL 94V-0 molding compound make it appropriate for under-hood and powertrain applications. The BZW06-256H meets these requirements without derating, distinguishing it from non-qualified alternatives.

What package type does the BZW06-256H use, and how is polarity identified?

The BZW06-256H uses the DO-204AC (DO-15) axial-leaded package with a cathode band marking the cathode terminal. The anode is the unmarked lead. This package supports manual and automated through-hole assembly and complies with J-STD-002 for solderability. The BZW06-256H's DO-204AC outline is dimensionally standardized, enabling direct replacement in legacy designs using DO-15 footprints.

How does the BZW06-256H compare to bidirectional TVS diodes in terms of response time?

The BZW06-256H is unidirectional and achieves a typical response time of less than 1.0ps from 0V to VBR, significantly faster than bidirectional variants in the same series (5.0ns). This speed advantage arises from optimized single-junction avalanche structure, making the BZW06-256H preferable for DC-biased lines where polarity is fixed. The BZW06-256H leverages this ultrafast activation to protect against ESD and fast transients before they propagate into ICs.

What is the thermal resistance profile of the BZW06-256H, and how does it affect PCB layout?

The BZW06-256H has RθJA = 100°C/W (with 10mm lead length) and RθJL = 60°C/W, indicating moderate thermal coupling to ambient and strong conduction to leads. For reliable operation at high surge repetition rates, PCB layout should maximize copper area on both leads and avoid thermal isolation. The BZW06-256H benefits from short, wide traces and optional thermal vias-especially critical in automotive modules where ambient temperatures exceed 105°C.