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Taiwan Semiconductor Corporation BZW04-239
- Part No.:
- BZW04-239
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-239.pdf
- Description:
- TVS DIODE 239VWM 384VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,782
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Product details
Overview
BZW04-239 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 239 V working stand-off voltage (VWM), 266–294 V breakdown voltage (VBR) at 1 mA, 384 A peak pulse current (IPP), 400 W peak pulse power (PPK) at 10/1000 μs, and clamps to ≤603 V under rated surge - deployed in automotive lighting control modules and industrial PLC I/O protection.
For engineers reviewing the BZW04-239 datasheet, BZW04-239 pinout, BZW04-239 application, or BZW04-239 equivalent, key selection criteria include its DO-41 package compatibility, AEC-Q101 qualification (BZW04-239H variant), low leakage (<1 μA @ 239 V), and thermal performance (RθJA = 100 °C/W on PCB).
Technical Context
The BZW04-239 operates as a silicon avalanche diode with unidirectional polarity, triggered when reverse voltage exceeds its specified VBR range. Its clamping action limits transient overvoltage to ≤603 V at 384 A, maintaining circuit integrity during EFT or inductive switching events.
It exhibits a temperature coefficient of VBR = 0.110 %/°C and junction-to-ambient thermal resistance of 100 °C/W on standard PCB layout (10 mm lead length), enabling reliable operation across –55 °C to +175 °C ambient conditions without derating below 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 239 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1 mA | 266–294 V - Avalanche breakdown threshold defining turn-on precision and tolerance |
| IPP @ 10/1000 μs | 384 A - Peak surge current it safely shunts without failure |
| VC @ IPP | ≤603 V - Clamped voltage seen by protected circuit during full-rated surge |
| PPK | 400 W - Peak pulse power handling capability per single 1 ms transient |
| ID @ VWM | <1 μA - Reverse leakage ensuring minimal standby power loss and signal integrity |
| TJ max | +175 °C - Maximum junction temperature supporting under-hood automotive use |
Pinout & Package
Package: DO-204AL (DO-41), axial-leaded, epoxy-molded case with cathode band marking for unidirectional polarity. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-side return path; defines conduction direction |
| Cathode | Protected line input | Connected to line being safeguarded (e.g., 24 V rail); clamps to anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option | BZW04-239H variant meets automotive reliability requirements for under-hood applications |
| Low impedance surge path | Enables fast energy diversion with minimal voltage overshoot during sub-μs transients |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 and environmental directives for industrial and automotive production |
| UL 94V-0 molding compound | Provides flame-retardant encapsulation essential for safety-critical power systems |
Applications
| Automotive LED Headlamp Driver Protection | Industrial 24 V PLC Digital Input Protection |
|---|---|
Use Scenario: Protects LED driver ICs from load-dump and jump-start transients in 12/24 V vehicle electrical systems. IC Role / Device Role / Timing Role: TVS clamping device placed between supply rail and ground, absorbing >400 W surges within nanoseconds. Use Value: Prevents catastrophic failure of buck controllers and gate drivers by limiting voltage to ≤603 V during ISO 7637-2 Pulse 5a events. | Use Scenario: Shields programmable logic controller digital input circuits from inductive kickback and EFT bursts. IC Role / Device Role / Timing Role: Standoff protector on 24 V optocoupler input stage, conducting only during >239 V excursions. Use Value: Ensures I/O channel immunity to 4 kV EFT (IEC 61000-4-4) while maintaining <1 μA leakage for accurate voltage sensing. |
| Telecom Power Feeding Line Protection | Renewable Energy DC Combiner Box Surge Suppression |
Use Scenario: Safeguards remote radio unit (RRU) power feeds against lightning-induced surges on -48 V DC lines. IC Role / Device Role / Timing Role: Primary unidirectional TVS on feed line, coordinated with upstream GDTs for staged protection. Use Value: Handles 384 A impulse current without degradation, preserving uptime in outdoor base station deployments. | Use Scenario: Installed across PV string outputs in solar combiner boxes to suppress induced surges from nearby strikes. IC Role / Device Role / Timing Role: High-voltage standoff TVS (239 V) selected to avoid tripping during normal MPPT voltage swings up to 220 V. Use Value: Clamps 603 V maximum during 10/1000 μs surges, protecting string monitoring ICs and fusing elements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ230A | DO-214AA package; 230 V VWM; 256–283 V VBR; 38.9 A IPP (8/20 μs); lower PPK (600 W @ 8/20 μs) | Designed for surface-mount PCBs; not axial; requires re-layout | Select when SMT assembly and higher surge repetition rate are required |
| P6KE240A | DO-15 package; 240 V VWM; 267–295 V VBR; 37.0 A IPP (8/20 μs); 600 W PPK (8/20 μs) | Legacy through-hole but larger body; lower thermal resistance (RθJA ≈ 65 °C/W) | Choose for cost-sensitive industrial designs where DO-41 footprint is unavailable |
Compared with SMBJ230A and P6KE240A, the BZW04-239 offers superior axial-lead mechanical robustness, tighter VBR tolerance (±5%), and optimized 10/1000 μs waveform rating - making it preferred for high-reliability automotive and heavy-industrial DC bus protection where lead-forming and thermal cycling endurance matter.
Availability
BZW04-239 is available at Aetrix Electronics and suitable for automotive lighting systems, industrial PLC I/O modules, telecom power feeding infrastructure, and renewable energy DC combiner boxes requiring stable component supply and long-term lifecycle support.
Supply support for BZW04-239 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, serving global automotive, industrial, and consumer markets since 1979.
The BZW04 series belongs to TSC's high-power TVS diode product line, engineered specifically for robust transient immunity in harsh environments - emphasizing AEC-Q101 qualification, tight parametric tolerances, and consistent clamping performance across temperature.
FAQ
What is the maximum clamping voltage of the BZW04-239 under rated surge conditions?
The BZW04-239 clamps to a maximum of 603 V when subjected to its rated 384 A peak pulse current (IPP) under the standard 10/1000 μs waveform. This value is measured at the device terminals and represents the upper limit of voltage imposed on the protected circuit during full-rated transient events, ensuring downstream components remain within safe operating limits.
Is the BZW04-239 suitable for automotive applications?
Yes - the BZW04-239H variant is explicitly AEC-Q101 qualified and designed for automotive use, including engine control units, body electronics, and lighting systems. The base BZW04-239 meets the same electrical and thermal specifications; however, only the "H" suffix denotes formal qualification. Always specify BZW04-239H for automotive-grade procurement.
What is the reverse leakage current specification for the BZW04-239 at its working voltage?
The BZW04-239 exhibits a maximum reverse leakage current (ID) of 1 μA when biased at its 239 V working stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage preserves signal integrity and minimizes power loss in high-impedance sensing or always-on circuits where even microamp-level currents affect accuracy or battery life.
Does the BZW04-239 have bidirectional capability?
No - the BZW04-239 is a unidirectional TVS diode, intended for DC line protection with defined polarity. Its counterpart is the BZW04-239B (bidirectional), which lacks polarity marking and protects against surges of either polarity. Using the unidirectional BZW04-239 on AC or floating lines may result in improper clamping or forward conduction.
What is the thermal resistance of the BZW04-239 in typical PCB mounting?
When mounted on a printed circuit board with 10 mm lead lengths, the BZW04-239 has a junction-to-ambient thermal resistance (RθJA) of 100 °C/W. This value assumes standard FR-4 board material and is critical for calculating junction temperature rise during sustained power dissipation or repetitive surge events in enclosed environments.
BZW04-239 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):
- 239V
- Voltage - Breakdown (Min):
- 266V
- Voltage - Clamping (Max) @ Ipp:
- 384V
- Current - Peak Pulse (10/1000µs):
- 1.1A
- 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)
BZW04-239 FAQ
1.How can I place an order for BZW04-239 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-239 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 BZW04-239 reliable?
The price and inventory of BZW04-239 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-239 is usually 5 days.
3.What payment methods are accepted for BZW04-239?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-239 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-239?
BZW04-239 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-239 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 BZW04-239?
For technical support, including BZW04-239 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-239 requirements.
6.How does Aetrix verify that BZW04-239 is sourced from the original manufacturer or authorized distributors?
All BZW04-239 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 BZW04-239 meets industry standards.
7.What is the process for return or replacement of BZW04-239?
All BZW04-239 units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-239, 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 BZW04-239 part is unused and in its original packaging.
Return procedure for BZW04-239:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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