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

Vishay General Semiconductor - Diodes Division BZW04P40B-E3/54

Name: BZW04P40B-E3/54
Brand: Vishay General Semiconductor - Diodes Division
SKU: BZW04P40B-E3/54
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZW04P40B-E3/54

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

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

Datasheet:: BZW04P40B-E3/54.pdf

Description:: TVS DIODE 40.2VWM 64.8VC DO204AL

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Product details

Overview

BZW04P40B-E3/54 from Vishay General Semiconductor is a bi-directional TransZorb® transient voltage suppressor (TVS) diode designed for robust overvoltage protection in signal and power lines. It features a 40.2 V stand-off voltage (V_WM), 64.8 V maximum clamping voltage (V_C) at 6.2 A peak pulse current, 400 W peak pulse power rating (10/1000 μs), and AEC-Q101 qualification - making it suitable for automotive sensor interface protection and industrial I/O line surge suppression.

For engineers reviewing the BZW04P40B-E3/54 datasheet, BZW04P40B-E3/54 pinout, BZW04P40B-E3/54 application, or BZW04P40B-E3/54 equivalent, key selection considerations include its bi-directional clamping behavior, DO-41 package compatibility, low leakage (<1 μA at V_WM), fast response time, and compliance with IEC 61000-4-2/4-4/4-5 surge immunity standards.

Technical Context

This device operates as a voltage-clamped crowbar during transients: when reverse or forward voltage exceeds its breakdown threshold (44.7–51.7 V), it avalanches to limit downstream voltage to ≤64.8 V. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance under repetitive 10/1000 μs pulses at 0.01% duty cycle.

Designed for bi-directional protection, BZW04P40B-E3/54 has no polarity marking and symmetrical electrical characteristics in both directions. It supports operating junction temperatures from –55 °C to +175 °C and meets UL 94 V-0 flammability requirements via its molded epoxy DO-204AL (DO-41) package.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	40.2 V - Maximum continuous working voltage before clamping begins; defines safe operating margin for 36 V nominal systems.
V_BR min/max	44.7 V / 51.7 V - Breakdown occurs within this range at 1 mA test current; ensures reliable triggering across temperature and unit variation.
V_C @ I_PPM	64.8 V - Clamped voltage at 6.2 A peak pulse; limits stress on protected ICs such as CAN transceivers or microcontroller GPIOs.
P_PPM	400 W - Peak pulse power handling with 10/1000 μs waveform; sufficient for Level 4 IEC 61000-4-5 (4 kV) surges on 50 Ω source impedance.
I_PPM	6.2 A - Maximum non-repetitive surge current; enables protection against inductive switch-off transients in automotive solenoid drivers.
T_J max	+175 °C - Maximum junction temperature; supports under-hood automotive placement and high-ambient industrial environments.
Leakage @ V_WM	<1 μA - Ultra-low reverse leakage preserves signal integrity and battery life in always-on circuits.

Pinout & Package

Package: DO-204AL (DO-41), axial lead, bi-directional - no cathode marking; matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry terminal in forward bias	Connects to lower-potential side of protected line; identical function to cathode in reverse bias due to bi-directionality.
Cathode	Current exit terminal in forward bias	Connects to higher-potential side of protected line; functionally interchangeable with anode for transient clamping in either polarity.

Key Features

Feature	Design Value
Bi-directional clamping	Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, sensor bridges) without polarity concerns.
AEC-Q101 qualified	Validated for automotive applications including engine control modules, body electronics, and ADAS sensor interfaces per stress test requirements.
Glass-passivated junction	Ensures long-term stability of breakdown voltage and low leakage under thermal cycling and humidity exposure.
400 W peak pulse power	Withstands multiple 10/1000 μs surges up to 4 kV (IEC 61000-4-5) without degradation when mounted on standard PCB copper.
UL 94 V-0 molding compound	Prevents flame propagation in fault conditions - critical for safety-critical automotive and industrial control enclosures.

Applications

Automotive Sensor Protection	Industrial I/O Surge Suppression
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine compartments exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed between sensor output and ECU input to shunt transients before they reach precision ADC front-end. Use Value: Limits clamped voltage to 64.8 V, preventing latch-up or gate oxide damage in 3.3 V/5 V microcontrollers while maintaining <1 μA leakage at 40.2 V operating voltage.	Use Scenario: Shielding PLC digital input channels from induced surges on 24 V DC field wiring in factory automation cabinets. IC Role / Device Role / Timing Role: Bi-directional transient suppressor installed across input terminals to clamp both positive and negative polarity surges from relay coil flyback or lightning-induced coupling. Use Value: Delivers 400 W pulse handling with 6.2 A peak current capacity, enabling compliance with IEC 61000-4-4 (electrical fast transients) and IEC 61000-4-5 (surge) immunity requirements.
Telecom Line Interface Protection	Consumer Device USB/Power Port Protection
Use Scenario: Safeguarding RS-485 transceiver pins in building management systems connected to long outdoor data runs. IC Role / Device Role / Timing Role: Primary overvoltage clamp on differential bus lines, coordinated with common-mode chokes to suppress asymmetric surges. Use Value: Symmetrical bi-directional response ensures equal clamping for both polarities of lightning-induced common-mode transients, preserving signal integrity up to 10 Mbps.	Use Scenario: Adding secondary-level surge protection on 5 V USB power inputs of smart home hubs exposed to ESD and hot-plug events. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after primary fuse and upstream of DC-DC converter to absorb residual energy not filtered by bulk capacitance. Use Value: 40.2 V V_WM provides 20% margin above 5 V rail while 64.8 V V_C prevents overvoltage stress on 12 V-rated input capacitors and LDOs.

Automotive Sensor Protection

Industrial I/O Surge Suppression

Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine compartments exposed to load dump and ISO 7637-2 pulses.

IC Role / Device Role / Timing Role: Voltage-clamping TVS placed between sensor output and ECU input to shunt transients before they reach precision ADC front-end.

Use Value: Limits clamped voltage to 64.8 V, preventing latch-up or gate oxide damage in 3.3 V/5 V microcontrollers while maintaining <1 μA leakage at 40.2 V operating voltage.

Use Scenario: Shielding PLC digital input channels from induced surges on 24 V DC field wiring in factory automation cabinets.

IC Role / Device Role / Timing Role: Bi-directional transient suppressor installed across input terminals to clamp both positive and negative polarity surges from relay coil flyback or lightning-induced coupling.

Use Value: Delivers 400 W pulse handling with 6.2 A peak current capacity, enabling compliance with IEC 61000-4-4 (electrical fast transients) and IEC 61000-4-5 (surge) immunity requirements.

Telecom Line Interface Protection

Consumer Device USB/Power Port Protection

Use Scenario: Safeguarding RS-485 transceiver pins in building management systems connected to long outdoor data runs.

IC Role / Device Role / Timing Role: Primary overvoltage clamp on differential bus lines, coordinated with common-mode chokes to suppress asymmetric surges.

Use Value: Symmetrical bi-directional response ensures equal clamping for both polarities of lightning-induced common-mode transients, preserving signal integrity up to 10 Mbps.

Use Scenario: Adding secondary-level surge protection on 5 V USB power inputs of smart home hubs exposed to ESD and hot-plug events.

IC Role / Device Role / Timing Role: Standoff-rated TVS placed after primary fuse and upstream of DC-DC converter to absorb residual energy not filtered by bulk capacitance.

Use Value: 40.2 V V_WM provides 20% margin above 5 V rail while 64.8 V V_C prevents overvoltage stress on 12 V-rated input capacitors and LDOs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ40CA	Same V_WM (40 V), but SMC package (DO-214AB); 600 W P_PPM; slightly higher V_C (64.5 V)	Higher power density; better suited for space-constrained PCBs requiring >400 W headroom	Select SMBJ40CA when board layout allows surface-mount and higher surge margin is needed.
P6KE40CA	Same DO-41 package; lower P_PPM (600 W), but higher V_C (69.4 V); older generation with wider V_BR tolerance	Less precise clamping; acceptable for non-critical industrial controls where cost is prioritized over tight V_C	Choose P6KE40CA only for legacy designs or cost-sensitive applications where 4.6 V higher clamping is tolerable.

Compared with SMBJ40CA and P6KE40CA, BZW04P40B-E3/54 offers tighter V_BR tolerance (±7.5% vs ±10%), lower leakage (<1 μA vs ~5 μA), and AEC-Q101 qualification - making it the preferred choice for new automotive and high-reliability industrial designs requiring validated performance and long-term stability.

Availability

BZW04P40B-E3/54 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom RS-485 ports, and consumer USB power protection requiring stable component supply and AEC-Q101 compliance.

Supply support for BZW04P40B-E3/54 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

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.

The BZW04P series belongs to Vishay's TransZorb® TVS family, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where robustness and AEC-Q101 validation are mandatory.

FAQ

What is the clamping voltage of BZW04P40B-E3/54 at its rated peak pulse current?

The BZW04P40B-E3/54 has a maximum clamping voltage (V_C) of 64.8 V at its rated peak pulse current (I_PPM) of 6.2 A, measured using the standard 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and ensures protected circuitry remains below destructive voltage thresholds during surge events. The BZW04P40B-E3/54 achieves this with low incremental surge resistance, contributing to consistent clamping performance.

Is BZW04P40B-E3/54 suitable for automotive applications?

Yes, BZW04P40B-E3/54 is AEC-Q101 qualified and explicitly rated for automotive use. Its construction - including glass-passivated junction, DO-41 package with matte tin leads, and operation from –55 °C to +175 °C - meets stress test requirements for engine control units, body electronics, and ADAS sensor interfaces. The BZW04P40B-E3/54 also complies with RoHS and UL 94 V-0, supporting full automotive supply chain traceability and safety certification.

How does the bi-directional nature of BZW04P40B-E3/54 affect its circuit implementation?

The bi-directional design of BZW04P40B-E3/54 means it functions identically in both forward and reverse bias, eliminating the need for polarity awareness during placement. This simplifies layout for AC-coupled or floating lines like RS-485 differential pairs or bridge sensor outputs. Unlike uni-directional TVS diodes, the BZW04P40B-E3/54 has no cathode band marking and delivers symmetrical clamping - ensuring equal protection against positive and negative transients without additional components.

What is the maximum steady-state power dissipation of BZW04P40B-E3/54?

The BZW04P40B-E3/54 has a maximum steady-state power dissipation (P_D) of 1.5 W when mounted on an infinite heatsink at lead temperature (T_L) = 75 °C. This rating applies to continuous DC or low-frequency operation - not transient suppression. For normal TVS operation, power dissipation remains negligible since the device conducts only during transient events; sustained conduction indicates system fault conditions beyond the BZW04P40B-E3/54's intended use case.

Does BZW04P40B-E3/54 require derating at elevated ambient temperatures?

Yes, BZW04P40B-E3/54 must be derated above T_A = 25 °C per Figure 2 in the Vishay datasheet (Document Number: 88316). Its peak pulse power capability decreases linearly to zero at +175 °C junction temperature. For example, at T_A = 85 °C with typical PCB thermal resistance, usable P_PPM drops to approximately 280 W. Designers must apply thermal modeling or consult Vishay's derating curves to ensure the BZW04P40B-E3/54 maintains required surge margin under actual operating conditions.

BZW04P40B-E3/54 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

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

Series:: TransZorb®

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Zener

Unidirectional Channels:: -

Bidirectional Channels:: 1

Voltage - Reverse Standoff (Typ):: 40.2V

Voltage - Breakdown (Min):: 44.7V

Voltage - Clamping (Max) @ Ipp:: 64.8V

Current - Peak Pulse (10/1000µs):: 6.2A

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)

BZW04P40B-E3/54 FAQ

1.How can I place an order for BZW04P40B-E3/54 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZW04P40B-E3/54 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 BZW04P40B-E3/54 reliable?

The price and inventory of BZW04P40B-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04P40B-E3/54 is usually 5 days.

3.What payment methods are accepted for BZW04P40B-E3/54?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04P40B-E3/54 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZW04P40B-E3/54?

BZW04P40B-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZW04P40B-E3/54 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 BZW04P40B-E3/54?

For technical support, including BZW04P40B-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04P40B-E3/54 requirements.

6.How does Aetrix verify that BZW04P40B-E3/54 is sourced from the original manufacturer or authorized distributors?

All BZW04P40B-E3/54 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 BZW04P40B-E3/54 meets industry standards.

7.What is the process for return or replacement of BZW04P40B-E3/54?

All BZW04P40B-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with BZW04P40B-E3/54, 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 BZW04P40B-E3/54 part is unused and in its original packaging.

Return procedure for BZW04P40B-E3/54:

1.Submit a request within 90 days.

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

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