Taiwan Semiconductor Corporation BZW06-48B

Overview

BZW06-48B from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 600W peak pulse power at 10/1000μs, with 47.8V working stand-off voltage, 53.2–58.8V breakdown voltage, and 77.0V clamping voltage at 7.8A. It protects automotive and industrial power rails against ESD, EFT, and inductive switching transients.

For engineers reviewing the BZW06-48B datasheet, BZW06-48B pinout, BZW06-48B application, or BZW06-48B equivalent, key selection criteria include clamping voltage margin vs. protected IC V_DD, unidirectional/bidirectional polarity match, thermal derating at elevated ambient, and AEC-Q101 qualification status for automotive use.

Technical Context

The BZW06-48B operates as a silicon avalanche diode with bidirectional conduction, enabling symmetric transient suppression on AC lines or floating DC buses. Its low dynamic impedance ensures stable clamping under fast-rising transients up to 5ns response time, and its 0.103%/°C temperature coefficient of V_BR supports predictable voltage drift across –55°C to +175°C junction range.

Designed for non-repetitive surge events, it delivers 600W peak power dissipation with 60°C/W junction-to-lead thermal resistance. The device meets JESD201 Class 2 whisker resistance and RoHS/halogen-free compliance, targeting high-reliability automotive and industrial environments where lead-free soldering and long-term stability are required.

Key Specifications

Pinout & Package

Package: DO-204AC (DO-15), axial-leaded, epoxy-molded case with pure tin-plated leads compliant to J-STD-002. Polarity marked by cathode band for unidirectional variants; BZW06-48B is bidirectional and has no polarity marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ48CA and 1.5KE48CA, the BZW06-48B offers AEC-Q101 qualification and DO-15 packaging optimized for through-hole reliability and thermal transfer via leads, making it preferred for automotive and high-vibration industrial deployments where qualification and mechanical robustness outweigh footprint constraints.

Availability

BZW06-48B is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, LED lighting systems, and AC/DC power supplies requiring stable component supply and AEC-Q101-compliant surge protection.

Supply support for BZW06-48B 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 is part of TSC's AEC-Q101-qualified TVS portfolio designed specifically for harsh-environment transient suppression in automotive power networks, industrial control inputs, and lighting systems where reliability under thermal and electrical stress is critical.

FAQ

What is the polarity configuration of BZW06-48B?

The BZW06-48B is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without polarity sensitivity. Unlike unidirectional variants (e.g., BZW06-48), it lacks a cathode band marking and can be mounted in either orientation on the PCB. This makes it ideal for AC-coupled lines or floating DC busses where voltage reversals occur. The BZW06-48B datasheet confirms bidirectional V_BR and V_C specifications across both polarities.

Does BZW06-48B meet AEC-Q101 requirements?

Yes, the BZW06-48B is explicitly AEC-Q101 qualified, as stated in the product features and ordering code notes (e.g., "H" suffix denotes qualification). It undergoes stress testing including high-temperature reverse bias, temperature cycling, and ESD per AEC-Q101 Rev D. This certification validates its suitability for automotive powertrain, body electronics, and ADAS modules where failure modes must be rigorously controlled. The BZW06-48B qualification report is available from Taiwan Semiconductor upon request.

What is the maximum clamping voltage of BZW06-48B under standard test conditions?

The maximum clamping voltage of BZW06-48B is 77.0 V at a peak pulse current of 7.8 A with a 10/1000 μs waveform, as specified in the Electrical Characteristics table. This value represents the upper bound of voltage seen by protected circuitry during worst-case surge events. The BZW06-48B maintains this clamping performance across its full operating temperature range (–55°C to +175°C), with minimal drift due to its 0.103%/°C V_BR temperature coefficient.

How does BZW06-48B compare to unidirectional BZW06-48 in terms of electrical performance?

The BZW06-48B and BZW06-48 share identical V_WM (47.8 V), V_BR (53.2–58.8 V), and V_C (77.0 V @ 7.8 A) ratings, but differ in polarity behavior: BZW06-48 is unidirectional (cathode-marked, blocks reverse DC), while BZW06-48B is bidirectional (no marking, conducts both ways). Both deliver 600W surge capability and AEC-Q101 qualification. The BZW06-48B is selected when AC line protection or polarity-agnostic DC bus clamping is required.

What thermal considerations apply to BZW06-48B in high-ambient designs?

BZW06-48B has a maximum junction temperature of 175°C and junction-to-lead thermal resistance of 60°C/W. In high-ambient environments (e.g., >85°C), derating is required: at 125°C ambient, maximum allowable power drops to ~300W per the pulse derating curve. PCB design must provide adequate copper area on both leads to maintain thermal path integrity. The BZW06-48B datasheet Fig.2 provides precise derating percentages versus ambient temperature for reliable lifetime estimation.