Taiwan Semiconductor Corporation BZW06-28H

Overview

BZW06-28H from Taiwan Semiconductor is an AEC-Q101 qualified unidirectional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, with 31.4 V minimum breakdown voltage, 28.2 V working stand-off voltage, 45.7 V clamping voltage at 13.1 A (10/1000 μs), 600 W peak pulse power rating, and <1 μA reverse leakage above 10 V - designed for automotive ESD and load-dump protection in engine control units and body electronics.

For engineers reviewing the BZW06-28H datasheet, BZW06-28H pinout, BZW06-28H application, or BZW06-28H equivalent, key selection criteria include its AEC-Q101 qualification, unidirectional polarity, DO-15 mechanical form factor, 175 °C maximum junction temperature, and verified clamping performance under 10/1000 μs surge waveforms.

Technical Context

The BZW06-28H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 31.4–34.7 V breakdown range (tested at 1 mA). It clamps transients to ≤45.7 V at 13.1 A (10/1000 μs) and ≤59.0 V at 68 A (8/20 μs), with dynamic impedance low enough to limit voltage overshoot during fast EFT events.

Its thermal design supports operation from –55 °C to +175 °C junction temperature, with 60 °C/W junction-to-lead thermal resistance and 100 °C/W junction-to-ambient (10 mm lead length), enabling reliable mounting on PCBs with moderate copper pour without active cooling.

Key Specifications

Pinout & Package

DO-204AC (DO-15) package: axial-leaded, cylindrical glass-passivated body with cathode band marking for unidirectional polarity. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TVS diode applications.

Compared with SMBJ28A and 1.5KE27A, the BZW06-28H uniquely combines AEC-Q101 qualification, sub-picosecond response, DO-15 through-hole compatibility, and precise 28.2 V stand-off - making it the only option validated for under-hood ECU power rail protection where reliability and timing-critical clamping are mandatory.

Availability

BZW06-28H is available at Aetrix Electronics and suitable for automotive engine control units, body electronics modules, lighting driver circuits, and infotainment power supplies requiring stable component supply across extended production lifecycles.

Supply support for BZW06-28H 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 headquartered in Hsinchu, Taiwan, specializing in discrete power devices, TVS diodes, rectifiers, and thyristors since 1979.

The BZW06 series was developed specifically for automotive-grade transient suppression, targeting AEC-Q101 compliance, high-temperature operation, and robust surge immunity in 12 V/24 V vehicle electrical architectures.

FAQ

What does the "H" suffix in BZW06-28H signify?

The "H" suffix in BZW06-28H indicates full AEC-Q101 qualification - verified through temperature cycling, high-temperature reverse bias, and ESD testing per automotive reliability standards. This distinguishes BZW06-28H from standard BZW06-28, which lacks formal automotive qualification. The BZW06-28H meets all stress test requirements for under-hood deployment and is traceable to TSC's certified automotive production line.

Is BZW06-28H unidirectional or bidirectional?

BZW06-28H is a unidirectional TVS diode, as confirmed by its single cathode band marking, absence of "B" suffix (e.g., BZW06-28B), and specification table listing only V_BR(uni-directional). It conducts in forward bias like a rectifier and clamps only reverse transients - making it suitable for DC power rail protection where polarity is fixed, unlike bidirectional variants used on AC or differential lines.

What is the maximum peak pulse current I_PPM for BZW06-28H under 10/1000 μs waveform?

Per the manufacturer's datasheet, BZW06-28H delivers 13.1 A peak pulse current (I_PPM) under the 10/1000 μs double-exponential surge waveform while clamping to 45.7 V. This value is measured at T_A = 25 °C with specified test conditions and correlates directly to its 600 W peak power rating (P_PK = V_C × I_PPM). Derating applies above 25 °C ambient per Fig.2.

Can BZW06-28H replace BZW06-28 in an existing design?

Yes - BZW06-28H is a drop-in replacement for BZW06-28 in terms of pinout, package (DO-15), and electrical parameters (V_WM, V_BR, V_C, P_PK). The only functional difference is AEC-Q101 qualification; no PCB or schematic changes are needed. However, BZW06-28H must be sourced from TSC's qualified automotive lot traceability system to maintain compliance in production.

What is the junction-to-lead thermal resistance (R_θJL) of BZW06-28H?

The junction-to-lead thermal resistance (R_θJL) of BZW06-28H is 60 °C/W, as specified in the Thermal Performance table. This value enables direct thermal coupling to PCB copper pours or heatsinks via the leads, supporting sustained operation at up to 1.7 W steady-state power dissipation when lead temperature is maintained at 75 °C - critical for thermally constrained automotive mounting locations.