Taiwan Semiconductor Corporation BZW06-273B

Overview

BZW06-273B from Taiwan Semiconductor is a unidirectional 600W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 273V working stand-off voltage (VWM), 304–336V breakdown voltage (VBR) at 1mA, and 438V clamping voltage (VC) at 1.6A (10/1000μs). It protects automotive and industrial power rails against ESD, EFT, and inductive switching transients.

For engineers reviewing the BZW06-273B datasheet, BZW06-273B pinout, BZW06-273B application, or BZW06-273B equivalent, key selection criteria include clamping performance at rated peak pulse current, junction temperature derating up to +175°C, AEC-Q101 qualification status, and DO-15 mechanical compatibility with legacy PCB footprints.

Technical Context

The BZW06-273B operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (304–336V), clamping transient energy within 1.0ps response time. Its low dynamic impedance ensures stable clamping under fast-rising surges such as ISO 7637-2 pulses or IEC 61000-4-4 EFT bursts.

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

Key Specifications

Pinout & Package

DO-204AC (DO-15) package: axial-leaded, glass-passivated silicon junction, cathode band marked on one end. 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 SMBJ270A and P6KE270A, the BZW06-273B offers AEC-Q101 qualification, tighter VBR tolerance (±5%), and lower leakage (<1μA), making it preferred for automotive and high-reliability industrial deployments where long-term parametric stability matters.

Availability

BZW06-273B is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input hardening, LED driver overvoltage clamping, and telecom DC feeder surge suppression requiring stable component supply across multi-year production cycles.

Supply support for BZW06-273B 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 Company (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and bipolar transistors since 1979.

The BZW06 series was developed specifically for high-energy transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, wide temperature operation, and repeatable clamping performance under real-world surge stress.

FAQ

What is the polarity configuration of the BZW06-273B?

The BZW06-273B is a unidirectional TVS diode, with cathode marked by a band on the DO-15 body. It conducts only during reverse overvoltage events - i.e., when the cathode is more positive than the anode - and blocks forward current like a standard rectifier. This configuration matches 24V/48V supply-line protection where transients occur on the positive rail relative to ground. The BZW06-273B must be installed with correct orientation to ensure clamping action.

Is the BZW06-273B AEC-Q101 qualified?

The BZW06-273B itself is not automatically AEC-Q101 qualified; qualification applies only to variants marked with "H" suffix (e.g., BZW06-273BH). Per TSC's ordering information, "H" denotes AEC-Q101 compliance. Standard BZW06-273B meets all electrical and mechanical specs but lacks formal automotive qualification testing. For automotive applications, specify BZW06-273BH to ensure certified reliability.

What is the maximum peak pulse current the BZW06-273B can handle?

The BZW06-273B handles up to 1.6A peak pulse current (IPPM) under the 10/1000μs waveform at which its 438V clamping voltage is specified. At the full 600W rating, peak current reaches approximately 7.1A (calculated from PPK = VC × IPPM → 600W / 438V ≈ 1.37A; actual datasheet lists 7.1A for 8/20μs waveform). Derating applies above 25°C ambient - consult Fig.2 for temperature-dependent IPPM limits. The BZW06-273B remains functional up to TJ = +175°C.

How does the BZW06-273B compare to the BZW06-273?

The BZW06-273B differs from BZW06-273 only in marking and packaging designation - "B" indicates bidirectional capability in some TSC families, but for the BZW06 series, both share identical unidirectional characteristics, DO-15 package, and electrical specs. Datasheet tables list them jointly (e.g., "BZW06-273 BZW06-273B") with identical VWM, VBR, VC, and PPK values. No functional or parametric distinction exists between BZW06-273 and BZW06-273B; the "B" suffix here is a legacy ordering code, not a functional modifier. The BZW06-273B is the currently shipped version.

What is the thermal resistance of the BZW06-273B, and how does it affect layout?

The BZW06-273B has R_θJL = 60°C/W (junction-to-lead) and R_θJA = 100°C/W (junction-to-ambient, with 10mm lead length). These values mean that for every watt of steady-state power dissipated, the junction rises 60°C above lead temperature - critical for surge duty-cycle analysis. Layout impact: keep leads ≥9.5mm long for rated PD = 1.7W; minimize copper area near leads to avoid unintended heat sinking that alters thermal path assumptions. The BZW06-273B's 175°C TJ max allows margin even with moderate ambient rise.