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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Taiwan Semiconductor Corporation BZW04-26

Name: BZW04-26
Brand: Taiwan Semiconductor Corporation
SKU: BZW04-26
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZW04-26

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: BZW04-26.pdf

Description:: TVS DIODE 25.6VWM 41.5VC DO204AL

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Product details

Overview

BZW04-26 from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power rails and signal lines. It features a 25.6 V working stand-off voltage, 28.5–31.5 V breakdown voltage at 1 mA test current, 41.5 V maximum clamping voltage at 9.6 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive lighting control and industrial sensor interface circuits.

For engineers reviewing the BZW04-26 datasheet, BZW04-26 pinout, BZW04-26 application, or BZW04-26 equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, junction temperature derating above 25°C, unidirectional polarity marking, DO-41 lead-form compatibility with through-hole PCB layouts, and AEC-Q101 qualification status for automotive-grade reliability validation.

Technical Context

The BZW04-26 operates as a silicon avalanche diode with low dynamic impedance during transient events, enabling rapid voltage clamping within nanoseconds. Its 1 mA breakdown test current and 0.097 %/°C temperature coefficient of V_BR ensure stable threshold behavior across automotive (-40°C to +125°C ambient) and industrial operating ranges.

Rated for 400 W non-repetitive peak pulse power (10/1000 µs), it sustains 9.6 A impulse current while limiting voltage to ≤41.5 V - critical for protecting 24 V systems where downstream ICs tolerate ≤45 V absolute maximum. Thermal resistance values (R_θJL = 60 °C/W, R_θJA = 100 °C/W) define safe steady-state power dissipation limits under PCB copper pad constraints.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	25.6 V - Maximum continuous reverse voltage before leakage exceeds 1 µA; sets upper limit for normal operation in 24 V nominal systems.
V_BR @ I_T = 1 mA	28.5–31.5 V - Avalanche breakdown range defining reliable turn-on threshold; ensures consistent clamping onset across production lots.
V_C @ I_PP = 9.6 A	≤41.5 V - Clamped voltage during 10/1000 µs surge; must remain below protected device's absolute max rating (e.g., 45 V MCU I/O).
P_PK	400 W - Peak pulse power handling capability; determines survivability against ISO 7637-2 Pulse 1/2a/5a transients in automotive environments.
Junction Temp Range	−55°C to +175°C - Enables use in under-hood automotive modules and industrial motor drives with high thermal stress.
Package	DO-204AL (DO-41) - Standard through-hole package with tin-plated leads; compatible with wave soldering and manual rework.

Pinout & Package

DO-204AL (DO-41) package: axial-leaded, glass-passivated silicon junction, cathode indicated by band marking. Lead length 9.5 mm, weight ≈0.300 g, UL 94V-0 molding compound.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction path / low-impedance return during positive transients	Connected to system ground or low-side reference; carries surge current to earth during clamping.
Cathode	Reverse-biased terminal / clamping node	Connected to protected line (e.g., 24 V rail); voltage rise beyond V_WM triggers avalanche conduction to clamp.

Key Features

Feature	Design Value
AEC-Q101 qualified option available	BZW04-26H variant meets stress testing requirements for automotive electronics including temperature cycling, HTRB, and ESD.
Low clamping ratio (V_C/V_BR)	≤1.45 - Ensures minimal overvoltage exposure to protected ICs during fast transients like EFT or load dump.
Ultra-low reverse leakage	<1 µA at 25.6 V - Prevents measurable power loss or bias shift in always-on 24 V monitoring circuits.
Fast response time	<1 ns - Reacts before most microsecond-scale transients (e.g., relay coil flyback) can damage downstream components.

Applications

Automotive Lighting Control	Industrial Sensor Interface
Use Scenario: Protecting LED driver ICs and MOSFET gate drivers from inductive kickback during headlamp switching. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V supply rail and ground, clamping voltage spikes up to 400 W. Use Value: Prevents latch-up or gate oxide rupture in driver ICs by limiting transient voltage to ≤41.5 V during 10/1000 µs surges.	Use Scenario: Safeguarding 4–20 mA current loop transmitters from ESD and electrical fast transients in factory automation. IC Role / Device Role / Timing Role: TVS mounted across loop supply terminals to shunt >8 kV contact ESD pulses per IEC 61000-4-2. Use Value: Maintains loop integrity with <1 µA leakage at 25.6 V, avoiding output current error or calibration drift.
Power Supply Input Protection	Motor Drive Gate Driver Protection
Use Scenario: Front-end surge suppression for 24 V DC-DC converters in railway signaling equipment. IC Role / Device Role / Timing Role: Primary clamping device on input rail, absorbing ISO 16750-2 Pulse 5a load dump energy. Use Value: Withstands 400 W peak power and 175°C junction temperature, enabling reliable operation without thermal shutdown.	Use Scenario: Protecting high-side N-channel MOSFET gate drivers from Miller-induced voltage spikes during IGBT switching. IC Role / Device Role / Timing Role: TVS connected between gate and source to clamp dv/dt-induced overshoot exceeding V_GS(max). Use Value: Fast <1 ns response prevents false turn-on; 41.5 V clamping stays safely below typical 20 V gate oxide rating.

Automotive Lighting Control

Industrial Sensor Interface

Use Scenario: Protecting LED driver ICs and MOSFET gate drivers from inductive kickback during headlamp switching.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V supply rail and ground, clamping voltage spikes up to 400 W.

Use Value: Prevents latch-up or gate oxide rupture in driver ICs by limiting transient voltage to ≤41.5 V during 10/1000 µs surges.

Use Scenario: Safeguarding 4–20 mA current loop transmitters from ESD and electrical fast transients in factory automation.

IC Role / Device Role / Timing Role: TVS mounted across loop supply terminals to shunt >8 kV contact ESD pulses per IEC 61000-4-2.

Use Value: Maintains loop integrity with <1 µA leakage at 25.6 V, avoiding output current error or calibration drift.

Power Supply Input Protection

Motor Drive Gate Driver Protection

Use Scenario: Front-end surge suppression for 24 V DC-DC converters in railway signaling equipment.

IC Role / Device Role / Timing Role: Primary clamping device on input rail, absorbing ISO 16750-2 Pulse 5a load dump energy.

Use Value: Withstands 400 W peak power and 175°C junction temperature, enabling reliable operation without thermal shutdown.

Use Scenario: Protecting high-side N-channel MOSFET gate drivers from Miller-induced voltage spikes during IGBT switching.

IC Role / Device Role / Timing Role: TVS connected between gate and source to clamp dv/dt-induced overshoot exceeding V_GS(max).

Use Value: Fast <1 ns response prevents false turn-on; 41.5 V clamping stays safely below typical 20 V gate oxide rating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ26A	DO-214AA package (SMB), 26 V V_WM, 400 W rating, but higher V_C = 42.1 V at 9.5 A	Surface-mount only; requires reflow-compatible layout; less suitable for through-hole legacy designs	Select when board space is constrained and SMT assembly is standard; verify PCB thermal relief for 100 °C/W R_θJA.
P6KE27A	DO-15 package, 27 V V_WM, lower 600 W rating but slower response and higher V_C = 45.7 V at 13.1 A	Higher clamping voltage reduces safety margin for 24 V systems; not AEC-Q101 qualified	Acceptable for cost-sensitive industrial use where 45.7 V clamping remains within protected IC limits; avoid in automotive.

Compared with SMBJ26A and P6KE27A, the BZW04-26 offers tighter clamping (41.5 V), DO-41 through-hole compatibility, and optional AEC-Q101 qualification - making it optimal for automotive and ruggedized industrial designs requiring proven mechanical robustness and precise voltage limiting.

Availability

BZW04-26 is available at Aetrix Electronics and suitable for automotive lighting control, industrial sensor interfaces, and 24 V power supply input protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for BZW04-26 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 high-reliability power devices and protection components.

The BZW04 series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 compliance, tight parameter distribution, and robust thermal performance in legacy through-hole packages.

FAQ

What is the polarity configuration of the BZW04-26?

The BZW04-26 is a unidirectional TVS diode, with cathode identified by a band marking on the DO-41 package body. It conducts in reverse bias during overvoltage events and blocks forward current up to its rated I_FSM of 40 A. This polarity enables precise clamping on positive-going transients in DC power rails - a key design feature confirmed in the BZW04-26 datasheet's marking diagram and electrical characteristics table.

Does the BZW04-26 meet automotive qualification standards?

The standard BZW04-26 is not AEC-Q101 qualified, but the BZW04-26H variant - identifiable by the "H" suffix in the ordering code - is fully AEC-Q101 certified. This includes testing for temperature cycling, high-temperature reverse bias, and ESD per JESD22-A114. Engineers selecting BZW04-26 for automotive applications must specify the H-suffix version to ensure compliance with automotive reliability requirements.

What is the maximum clamping voltage of the BZW04-26 under surge conditions?

The BZW04-26 has a maximum clamping voltage (V_C) of 41.5 V at a peak pulse current (I_PP) of 9.6 A, measured using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage bound imposed on protected circuitry during surge events - a critical parameter verified in the BZW04-26's Maximum Ratings and Electrical Characteristics table.

How does the BZW04-26 compare to bidirectional variants like BZW04-26B?

The BZW04-26 is unidirectional and intended for DC line protection, whereas BZW04-26B is bidirectional and suited for AC or dual-polarity signal lines. They share identical V_WM, V_BR, and V_C ratings, but differ in polarity marking and application scope. Using BZW04-26 in place of BZW04-26B on an AC line would result in forward conduction during negative half-cycles - a functional mismatch confirmed in the BZW04-26's polarity specification and mechanical data section.

What is the thermal resistance profile of the BZW04-26?

The BZW04-26 exhibits a junction-to-lead thermal resistance (R_θJL) of 60 °C/W and a junction-to-ambient resistance (R_θJA) of 100 °C/W when mounted on a PCB with 10 mm lead lengths. These values are measured per JEDEC standards and directly impact steady-state power dissipation limits - for example, at 75°C lead temperature, the device supports 1 W continuous power, as specified in the Absolute Maximum Ratings table for the BZW04-26.

BZW04-26 Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Package/Case:: DO-204AL, DO-41, Axial

Series:: BZW04

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 25.6V

Voltage - Breakdown (Min):: 28.5V

Voltage - Clamping (Max) @ Ipp:: 41.5V

Current - Peak Pulse (10/1000µs):: 9.6A

Power - Peak Pulse:: 400W

Power Line Protection:: No

Applications:: General Purpose

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AL (DO-41)

BZW04-26 FAQ

1.How can I place an order for BZW04-26 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZW04-26 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BZW04-26 reliable?

The price and inventory of BZW04-26 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-26 is usually 5 days.

3.What payment methods are accepted for BZW04-26?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-26 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZW04-26?

BZW04-26 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZW04-26 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BZW04-26?

For technical support, including BZW04-26 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-26 requirements.

6.How does Aetrix verify that BZW04-26 is sourced from the original manufacturer or authorized distributors?

All BZW04-26 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BZW04-26 meets industry standards.

7.What is the process for return or replacement of BZW04-26?

All BZW04-26 units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-26, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BZW04-26 part is unused and in its original packaging.

Return procedure for BZW04-26:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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