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Taiwan Semiconductor Corporation BZW04-40B
- Part No.:
- BZW04-40B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-40B.pdf
- Description:
- TVS DIODE 40.2VWM 64.8VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,180
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Product details
Overview
BZW04-40B from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in automotive and industrial power rails. It features a 40.2 V working stand-off voltage, 44.7–49.4 V breakdown voltage at 1 mA, 6.2 A peak impulse current, 64.8 V clamping voltage at IPP, and 400 W peak pulse power rating at 10/1000 µs waveform - deployed to safeguard CAN transceivers and microcontroller I/O against EFT and load dump.
For engineers reviewing the BZW04-40B datasheet, BZW04-40B pinout, BZW04-40B application, or BZW04-40B equivalent, key selection criteria include unidirectional/bidirectional polarity configuration, DO-41 package thermal limits (RθJA = 100 °C/W), clamping performance under 10/1000 µs surges, and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
The BZW04-40B operates as a silicon avalanche diode with bidirectional clamping action, enabling symmetrical transient suppression on AC-coupled or floating signal lines. Its low dynamic impedance ensures stable clamping during fast-rising transients (response time < 1 ps), while the 0.101 %/°C VBR temperature coefficient maintains predictable breakdown drift across –55 °C to +175 °C junction range.
It complies with ANSI/IEEE C62.35 for surge testing methodology and delivers 400 W non-repetitive peak power dissipation per 1 ms pulse, derated linearly above 25 °C ambient per Fig.2. The device sustains 40 A forward surge current (8.3 ms half-sine) and exhibits < 1 µA reverse leakage above 10 V, confirming tight stand-off integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40.2 V - Maximum continuous DC or RMS voltage the device blocks without conduction; defines safe operating margin before clamping onset. |
| VBR @ IT = 1 mA | 44.7–49.4 V - Measured breakdown voltage range at 1 mA test current; sets precise clamping threshold for design margining. |
| VC @ IPP = 6.2 A | 64.8 V - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected downstream ICs. |
| PPK | 400 W - Peak pulse power handling capability; validates robustness against ISO 7637-2 Pulse 1/2/5a and IEC 61000-4-5 surges. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on PCB with 10 mm lead length; informs heatsinking requirements for repetitive surge duty. |
| IR @ VWM | < 1 µA - Reverse leakage at rated stand-off voltage; ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| TJ Range | –55 °C to +175 °C - Full operational junction temperature window; supports under-hood automotive and industrial motor control environments. |
Pinout & Package
Package: DO-204AL (DO-41), axial-leaded, epoxy-molded case meeting UL 94V-0 flammability rating. Leads are pure tin-plated and solderable per J-STD-002. Polarity marked by cathode band for unidirectional variants; BZW04-40B is bidirectional and has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bidirectional avalanche junction terminals | Interchangeable connection points - no polarity sensitivity; enables placement across AC signals or floating buses without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (H-grade option) | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD - supports ASIL-B system integration. |
| 400 W peak pulse power (10/1000 µs) | Withstands high-energy transients from inductive switching (e.g., solenoid drivers) without degradation or thermal runaway. |
| Clamping voltage ≤ 64.8 V at 6.2 A | Ensures protected ICs (e.g., 5 V or 3.3 V logic) remain below absolute maximum ratings during surge events. |
| Reverse leakage < 1 µA @ 40.2 V | Minimizes quiescent current draw and avoids false triggering in battery-powered or low-power sensor nodes. |
| DO-41 package with 0.300 g mass | Enables manual or automated through-hole assembly; compatible with legacy PCB footprints and reflow/reflow-compatible wave solder profiles. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN/CAN bus transceivers and microcontroller supply rails from load dump (ISO 7637-2 Pulse 5a) and jump-start surges. IC Role / Device Role: Bidirectional clamping element placed between VCC and GND, shunting surge energy to ground before it reaches sensitive analog/digital ICs. Use Value: Maintains system uptime by preventing latch-up or permanent damage to 5 V/3.3 V transceivers during 12 V/24 V vehicle electrical disturbances. |
Use Scenario: Shielding 4–20 mA current loop receivers and RS-485 transceivers from EFT bursts (IEC 61000-4-4) in factory automation PLCs. IC Role / Device Role: Fast-response TVS placed across differential signal pairs or supply inputs to clamp sub-100 ns transients. Use Value: Preserves data integrity and prevents communication lockup in noisy industrial environments where >1 kV EFT pulses are common. |
| LED Driver Output Protection | AC-DC Adapter Input Stage |
Use Scenario: Safeguarding constant-current LED driver outputs against inductive kickback from disconnected loads or relay switching. IC Role / Device Role: Bidirectional TVS connected across output terminals to absorb reverse EMF spikes up to 400 W. Use Value: Extends LED module lifetime by eliminating voltage overshoot that degrades bond wires and phosphor layers in high-brightness arrays. |
Use Scenario: Front-end surge suppression on primary-side rectifier outputs in offline AC-DC adapters subjected to lightning-induced surges (IEC 61000-4-5). IC Role / Device Role: Standoff-rated TVS placed after bridge rectifier but before bulk capacitor to limit transient overvoltage before filtering. Use Value: Prevents premature electrolytic capacitor failure and MOSFET avalanche breakdown in compact, cost-sensitive power supplies. |
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 (Bourns) | Same DO-214AA (SMB) package; 40 V VWM, 64.5 V VC @ 6.2 A, 600 W PPK; higher power but surface-mount only. | Requires PCB redesign for SMT layout; unsuitable for through-hole legacy systems or high-vibration mechanical mounting. | Select SMBJ40CA only when board space is constrained and reflow assembly is available; not drop-in for DO-41 footprint. |
| P6KE40CA (Littelfuse) | DO-15 package; identical 40 V VWM, 64.5 V VC @ 6.2 A, 600 W PPK; larger body (5.2 mm Ø vs. DO-41's 2.7 mm Ø), higher RθJA (~120 °C/W). | Higher thermal resistance reduces repetitive surge capability; less suitable for high-duty-cycle industrial motor drives. | Choose P6KE40CA if DO-15 footprint exists and AEC-Q101 is not required; verify thermal derating in enclosed enclosures. |
Compared with SMBJ40CA and P6KE40CA, the BZW04-40B offers direct DO-41 through-hole compatibility, AEC-Q101 qualification path (via H-grade), and optimized thermal performance (RθJA = 100 °C/W) for mechanically robust, high-reliability wired interconnects - making it preferred for automotive body control modules and industrial fieldbus nodes.
Availability
BZW04-40B is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial 4–20 mA sensor interfaces, and LED lighting driver outputs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZW04-40B 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 BZW04 series was engineered specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, tight parametric tolerances, and robust surge endurance under extended temperature cycling.
FAQ
What is the polarity configuration of the BZW04-40B?
The BZW04-40B is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without polarity sensitivity. Unlike unidirectional variants (e.g., BZW04-40), it has no cathode band marking and can be installed in either orientation across AC-coupled or floating signal paths - a key advantage for protecting differential buses like RS-485 or CAN FD physical layers.
Does the BZW04-40B meet AEC-Q101 requirements?
The base BZW04-40B is not AEC-Q101 qualified; however, the variant BZW04-40BH (with "H" suffix) is fully AEC-Q101 certified per stress test conditions including high-temperature operating life, temperature cycling, and ESD. Engineers specifying BZW04-40B for automotive use must select the "H" grade version to ensure compliance with automotive reliability standards.
What is the maximum clamping voltage of the BZW04-40B during a 10/1000 µs surge?
The BZW04-40B clamps to a maximum of 64.8 V when subjected to a 6.2 A peak impulse current under the standard 10/1000 µs double-exponential waveform. This value is guaranteed per the datasheet's maximum specification and defines the upper voltage limit imposed on protected circuitry - critical for ensuring downstream 5 V or 3.3 V ICs remain within absolute maximum ratings during surge events.
How does the thermal performance of the BZW04-40B compare to other DO-41 TVS diodes?
The BZW04-40B achieves a junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on a PCB with 10 mm lead length - among the lowest for DO-41 packaged TVS diodes. This enables higher repetitive surge duty cycles than alternatives like P6KE40CA (RθJA ≈ 120 °C/W), reducing risk of thermal runaway in applications with frequent transients such as motor drive feedback loops or solenoid control circuits.
Can the BZW04-40B replace the P4KE40CA in an existing design?
No - the BZW04-40B cannot directly replace the P4KE40CA due to fundamental package and electrical differences: P4KE40CA uses DO-41 but is unidirectional, whereas BZW04-40B is bidirectional. Additionally, P4KE40CA has higher VC (69.4 V) and lower PPK (400 W same, but different waveform definition). Substitution requires verification of polarity requirements, clamping margin, and layout compatibility - BZW04-40B is not a drop-in replacement.
BZW04-40B 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:
- -
- 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)
BZW04-40B FAQ
1.How can I place an order for BZW04-40B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-40B 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 BZW04-40B reliable?
The price and inventory of BZW04-40B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-40B is usually 5 days.
3.What payment methods are accepted for BZW04-40B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-40B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-40B?
BZW04-40B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-40B 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 BZW04-40B?
For technical support, including BZW04-40B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-40B requirements.
6.How does Aetrix verify that BZW04-40B is sourced from the original manufacturer or authorized distributors?
All BZW04-40B 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 BZW04-40B meets industry standards.
7.What is the process for return or replacement of BZW04-40B?
All BZW04-40B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-40B, 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 BZW04-40B part is unused and in its original packaging.
Return procedure for BZW04-40B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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