Taiwan Semiconductor Corporation BZW04-239 A0G

Overview

BZW04-239 A0G from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-204AL (DO-41) package, rated for 400W peak pulse power at 10/1000μs, with 239V working stand-off voltage (VWM), 266–294V breakdown voltage (VBR @ 1mA), and 384A maximum peak impulse current (IPP). It protects automotive and industrial power rails against ESD and inductive switching transients.

For engineers reviewing the BZW04-239 A0G datasheet, BZW04-239 A0G pinout, BZW04-239 A0G application, or BZW04-239 A0G equivalent, key selection criteria include clamping voltage (VC = 603V @ IPP), junction temperature range (−55°C to +175°C), low leakage (<1μA @ VWM), AEC-Q101 qualification eligibility, and DO-41 mechanical compatibility for through-hole PCB layouts.

Technical Context

The BZW04-239 A0G operates as a silicon avalanche diode, leveraging controlled reverse-biased breakdown to clamp transient overvoltages. Its unidirectional polarity enables DC rail protection with cathode-anode orientation, and its 60°C/W junction-to-lead thermal resistance supports reliable power dissipation under surge conditions.

Designed for single-pulse 10/1000μs waveform compliance per ANSI/IEEE C62.35, it delivers stable clamping performance across −55°C to +175°C operating junction temperature, with <0.110%/°C VBR temperature coefficient ensuring predictable voltage threshold drift in thermal cycling environments.

Key Specifications

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, through-hole mount. Cathode identified by band marking. RoHS-compliant, halogen-free molding compound (UL 94V-0), pure tin-plated leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ230A and P6KE240A, the BZW04-239 A0G offers tighter VBR tolerance (266–294V vs. ±5%), DO-41 mechanical compatibility with existing wave-solder processes, and direct AEC-Q101-qualified variant availability-making it optimal for automotive and industrial through-hole surge protection where thermal reliability and qualification traceability are mandatory.

Availability

BZW04-239 A0G is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input safeguarding, and LED driver overvoltage clamping requiring stable component supply, long-term lifecycle support, and AEC-Q101-aligned sourcing.

Supply support for BZW04-239 A0G 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, specializing in power management, protection, and signal conditioning devices since 1979.

The BZW04 series was engineered for high-reliability transient suppression in harsh environments, targeting automotive, industrial automation, and infrastructure applications where robustness, thermal stability, and qualification compliance are non-negotiable.

FAQ

What is the clamping voltage of the BZW04-239 A0G under maximum surge conditions?

The BZW04-239 A0G has a maximum clamping voltage (VC) of 603 V at its rated peak impulse current (IPP) of 384 A, measured under the standardized 10/1000μs double-exponential surge waveform. This value defines the highest voltage that will appear across the protected circuit during a worst-case transient event, and it is guaranteed across the full operating temperature range of −55°C to +175°C.

Is the BZW04-239 A0G suitable for automotive applications?

Yes-the BZW04-239 A0G is manufactured using the same die and process as the AEC-Q101-qualified BZW04-239H variant. While the A0G suffix denotes ammo-pack packaging rather than qualification status, its construction, thermal performance (TJ max = 175°C), and surge robustness meet automotive environmental requirements. For certified deployment, specify BZW04-239H; for prototyping or non-certified production, BZW04-239 A0G provides identical electrical behavior.

What is the reverse leakage current specification for the BZW04-239 A0G at its working stand-off voltage?

The BZW04-239 A0G exhibits a maximum reverse leakage current (ID) of 1 μA when biased at its working stand-off voltage (VWM) of 239 V, tested at TA = 25°C. This ultra-low leakage preserves efficiency in high-impedance monitoring circuits and extends battery life in always-on systems, with leakage remaining well below 10 μA even at elevated temperatures up to 125°C.

Does the BZW04-239 A0G have bidirectional capability?

No-the BZW04-239 A0G is a unidirectional TVS diode, intended for DC rail protection where polarity is fixed. Its datasheet specifies only unidirectional parameters (e.g., VBR min/max at 1 mA, VC at IPP), and the device features a cathode band marking. For AC or bipolar transient protection, use the pin-compatible BZW04-239B variant, which provides symmetrical breakdown in both directions.

What is the thermal resistance profile of the BZW04-239 A0G, and how does it affect PCB layout?

The BZW04-239 A0G has a junction-to-lead thermal resistance (RθJL) of 60°C/W and a junction-to-ambient resistance (RθJA) of 100°C/W on a PCB with 10 mm lead lengths. To maximize surge survivability, designers should use ≥5 × 5 mm copper pads per lead and minimize trace length-this leverages the leads as primary heat paths, reducing thermal impedance and preventing localized overheating during repetitive or high-duty-cycle transients.