Taiwan Semiconductor Corporation BZW06-31H

Overview

BZW06-31H from Taiwan Semiconductor is a unidirectional 600W Transient Voltage Suppressor (TVS) diode with a 30.8V working stand-off voltage, 34.2–37.8V breakdown range at 1mA, and 49.9V clamping voltage at 12A (10/1000μs). It features AEC-Q101 qualification, low dynamic impedance, and sub-1ps response time, deployed for automotive ESD and load-dump protection in powertrain control modules.

For engineers reviewing the BZW06-31H datasheet, BZW06-31H pinout, BZW06-31H application, or BZW06-31H equivalent, key selection criteria include its DO-204AC (DO-15) package, unidirectional polarity, AEC-Q101 qualification, 175°C max junction temperature, and verified clamping performance under ISO 7637-2 pulse 5a/b conditions.

Technical Context

The BZW06-31H operates as a unidirectional avalanche diode, leveraging silicon PN-junction physics to clamp transients above V_BR while maintaining <1μA leakage at 30.8V. Its thermal design supports 175°C operation with R_θJL = 60°C/W and R_θJA = 100°C/W (L = 10mm), enabling robust mounting on PCBs with minimal copper area.

It delivers 600W peak pulse power per 10/1000μs waveform and sustains 1.7W steady-state dissipation at T_L = 75°C. The device exhibits a +0.099%/°C temperature coefficient of V_BR, ensuring predictable voltage drift across automotive ambient ranges.

Key Specifications

Pinout & Package

Package: DO-204AC (DO-15), axial-leaded, epoxy-molded case with cathode band marking for unidirectional polarity. Lead finish: pure tin, J-STD-002 solderable. Weight: 0.400 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ33A and 1.5KE33A, the BZW06-31H uniquely combines AEC-Q101 qualification, DO-15 form factor, and 49.9V clamping at 12A-making it the only option for new automotive designs requiring compact, qualified, high-reliability TVS protection on 12V rails.

Availability

BZW06-31H is available at Aetrix Electronics and suitable for automotive powertrain ECUs, industrial PLC I/O modules, LED headlamp drivers, and body control modules requiring stable component supply with full AEC-Q101 traceability.

Supply support for BZW06-31H 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs since 1979.

The BZW06 series was engineered specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 reliability, tight V_BR tolerance, and consistent clamping performance across temperature.

FAQ

What is the polarity configuration of the BZW06-31H?

The BZW06-31H is a unidirectional TVS diode, marked with a cathode band indicating the cathode terminal. It conducts avalanche current only when the cathode is biased positive relative to the anode-making it suitable for protecting positive supply rails like 12V automotive systems. This differs from bidirectional variants (e.g., BZW06-31BH) which lack polarity marking and protect AC or differential lines. The BZW06-31H datasheet confirms unidirectional behavior in all electrical characteristics tables and mechanical diagrams.

Does the BZW06-31H meet AEC-Q101 requirements?

Yes, the "H" suffix in BZW06-31H explicitly denotes AEC-Q101 qualification. Test reports cover high-temperature reverse bias (HTRB), temperature cycling, ESD (HBM ≥8kV, CDM ≥1kV), and mechanical robustness per AEC-Q101 Rev D. This certification is documented in Taiwan Semiconductor's official product change notices and is verified on distributor pages (e.g., Digi-Key part #1086-1022-1-ND). The BZW06-31H is approved for use in automotive powertrain and chassis applications.

What is the maximum clamping voltage of the BZW06-31H under standard test conditions?

The BZW06-31H has a maximum clamping voltage (V_C) of 49.9 V at 12.0 A using the 10/1000μs double-exponential surge waveform. This value is measured per IEC 61000-4-5 and is guaranteed across the full operating temperature range (−55°C to +175°C). It reflects the peak voltage seen by downstream circuitry during worst-case transients, and is critical for ensuring compatibility with 3.3V, 5V, and 12V ICs. The BZW06-31H datasheet lists this parameter in Table "Maximum Ratings and Electrical Characteristics" on page 2.

Can the BZW06-31H be used in bidirectional signal line protection?

No, the BZW06-31H is strictly unidirectional and must not be used on bidirectional lines such as USB, RS-485, or CAN bus data pairs. Its asymmetrical I-V curve provides clamping only for positive transients on the cathode side. For bidirectional protection, Taiwan Semiconductor specifies the BZW06-31BH variant, which uses a back-to-back diode structure and omits the cathode band. Using BZW06-31H on differential or AC-coupled signals risks forward conduction, rail collapse, or failure. Always verify polarity alignment before placing the BZW06-31H in circuit.

What is the thermal resistance specification for the BZW06-31H?

According to the BZW06-31H datasheet, the junction-to-lead thermal resistance (R_θJL) is 60°C/W, and the junction-to-ambient resistance (R_θJA) is 100°C/W with 10 mm lead length. These values assume standard PCB mounting with minimal copper; adding thermal relief or copper pour can reduce R_θJA by up to 30%. The 175°C maximum junction temperature allows operation in under-hood environments when combined with proper layout. Thermal performance is validated per JESD51-14 standards and applies directly to the BZW06-31H in DO-204AC packaging.