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Taiwan Semiconductor Corporation BZW04-299
- Part No.:
- BZW04-299
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-299.pdf
- Description:
- TVS DIODE 299VWM 482VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,073
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Product details
Overview
BZW04-299 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 299 V working stand-off voltage (VWM), 332–368 V breakdown voltage (VBR @ 1 mA), 482 A peak pulse current (IPP), 0.8 μA reverse leakage at VWM, and 400 W peak pulse power (10/1000 μs). It is commonly deployed in automotive body electronics to protect LIN bus transceivers from load dump and EFT events.
For engineers reviewing the BZW04-299 datasheet, BZW04-299 pinout, BZW04-299 application, or BZW04-299 equivalent, key selection criteria include clamping voltage under surge (VC = 482 V @ IPP), thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification status, DO-41 package compatibility, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The BZW04-299 operates as a silicon avalanche diode with sharp reverse-breakdown characteristics, enabling sub-nanosecond response to transients exceeding VWM. Its unidirectional configuration provides forward conduction capability while clamping only in reverse, making it suitable for DC-biased lines where forward surge immunity is not required.
It is rated for 175 °C maximum junction temperature and exhibits a positive temperature coefficient of VBR (+0.110 %/°C), ensuring stable clamping performance across automotive temperature ranges. Thermal derating follows standard JEDEC curves, with full 400 W capability only at TA = 25 °C and linear reduction above that ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 299 V - Maximum continuous DC or RMS voltage the device blocks without clamping; sets minimum system operating voltage margin before protection activates. |
| VBR @ 1 mA | 332–368 V - Breakdown voltage range at 1 mA test current; defines the onset threshold for avalanche conduction during overvoltage events. |
| VC @ IPP | 482 V - Clamping voltage at 482 A peak pulse current (10/1000 μs); determines maximum voltage seen by protected IC during worst-case surge. |
| IPP | 482 A - Peak impulse current the device safely shunts without failure; directly supports IEC 61000-4-5 Level 4 (4 kV, 2 Ω source) compliance when properly laid out. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on PCB with 10 mm lead length; informs heatsinking requirements for repeated surge duty cycles. |
| TJMAX | 175 °C - Maximum allowable junction temperature; enables operation in under-hood automotive environments without thermal shutdown. |
Pinout & Package
Package: DO-204AL (DO-41), axial-leaded glass-passivated 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 | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surges or fault conditions. |
| Cathode | Clamping terminal | Marked with band; connected to protected line (e.g., LIN bus or 24 V rail); initiates avalanche conduction when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Supports IEC 61000-4-5 surge testing up to 4 kV (2 Ω source) without degradation when mounted per JEDEC layout guidelines. |
| 0.8 μA reverse leakage @ VWM | Minimizes standby power loss in always-on automotive modules (e.g., door control units), preserving battery life over extended sleep periods. |
| AEC-Q101 qualified (BZW04-299H variant) | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for body electronics deployment. |
| 100 °C/W RθJA | Enables thermal design with standard PCB copper pads (5 × 5 mm per lead); no additional heatsink needed for single-event surge handling. |
| Positive VBR tempco (+0.110 %/°C) | Ensures clamping voltage increases predictably with temperature, preventing premature triggering in hot under-hood environments. |
Applications
| Automotive LIN Bus Protection | Industrial 24 V DC Power Rail |
|---|---|
|
Use Scenario: Protecting LIN transceivers in door modules from inductive switching spikes and battery load dump transients. IC Role / Device Role: Unidirectional TVS placed between LIN line and ground, clamping reverse transients above 299 V while remaining invisible during normal 12–27 V operation. Use Value: Limits voltage seen by LIN PHY to ≤482 V during 400 W surges, preventing latch-up or gate oxide damage in compliant transceivers (e.g., TLE7259-3). |
Use Scenario: Safeguarding PLC I/O modules powered from 24 V industrial supplies against field-wiring faults and relay coil flyback. IC Role / Device Role: Primary overvoltage clamp on 24 V input rail, positioned upstream of DC-DC converters and microcontrollers. Use Value: Absorbs 482 A transient energy without failure, maintaining downstream rail integrity and avoiding brownout resets during factory equipment switching events. |
| LED Driver Output Stage | Telecom DC Feeder Line |
|
Use Scenario: Protecting constant-current LED driver outputs from accidental short-to-battery or hot-plug surges in commercial lighting systems. IC Role / Device Role: Unidirectional TVS connected anode-to-ground, cathode-to-driver output, clamping positive transients on the high-side output node. Use Value: Withstands 400 W pulses while holding output voltage below 482 V, preventing MOSFET drain-source avalanche and gate driver latch-up. |
Use Scenario: Shielding telecom remote power feeding circuits (e.g., -48 V PSE) from lightning-induced surges on outdoor cable runs. IC Role / Device Role: High-voltage unidirectional TVS placed between -48 V feed line and chassis ground, blocking reverse polarity faults and clamping positive surges. Use Value: Rated for 299 V standoff ensures compatibility with -48 V nominal systems while clamping 482 V peaks - meeting GR-1089-CORE Level 3 surge immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ280A | DO-214AA package (SMB), 280 V VWM, 311–344 V VBR, 400 W rating, bidirectional option available | Surface-mount footprint; higher board density but requires reflow-compatible layout and lacks axial lead mechanical robustness | Select SMBJ280A when space-constrained PCBs demand SMD mounting and thermal management uses larger copper areas instead of lead length. |
| P6SMB270A | DO-214AA package, 270 V VWM, 300–332 V VBR, 600 W rating, higher IPP (536 A), same AEC-Q101 availability | Higher surge capacity and tighter VBR tolerance, but larger package volume and different thermal profile | Choose P6SMB270A when system-level surge testing exceeds IEC 61000-4-5 Level 4 or when legacy designs already use SMB footprint. |
Compared with BZW04-299, SMBJ280A offers SMD convenience at the cost of axial mechanical stability and higher assembly complexity, while P6SMB270A delivers greater surge headroom in the same SMB form factor - both require layout revision and thermal reassessment for direct substitution.
Availability
BZW04-299 is available at Aetrix Electronics and suitable for automotive body electronics, industrial 24 V power systems, LED driver protection, and telecom DC feeder lines requiring stable component supply, long-lifecycle support, and AEC-Q101-compliant variants.
Supply support for BZW04-299 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 devices, and automotive-qualified components since 1979.
The BZW04 series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, wide VWM coverage (5.8–376 V), and robust DO-41 packaging for vibration-prone applications.
FAQ
What is the clamping voltage of the BZW04-299 under a 400 W surge?
The BZW04-299 clamps to 482 V at its rated peak pulse current of 482 A (10/1000 μs waveform), which corresponds to 400 W peak pulse power. This value is measured per ANSI/IEEE C62.35 and defines the maximum voltage imposed on protected circuitry during standardized surge events. The BZW04-299 maintains this clamping performance across its specified operating temperature range.
Is the BZW04-299 suitable for bidirectional signal line protection?
No - the BZW04-299 is a unidirectional TVS diode, intended for DC-biased lines where only reverse-polarity transients must be suppressed. For bidirectional protection (e.g., RS-485, CAN), the BZW04-299B variant must be used. The BZW04-299 itself has polarity marking (cathode band) and conducts forward current; using it on AC or floating signals risks unintended conduction and failure.
Does the BZW04-299 meet AEC-Q101 qualification?
The base BZW04-299 is not AEC-Q101 qualified; however, the BZW04-299H variant - identifiable by the "H" suffix in the ordering code - is fully AEC-Q101 qualified and tested per stress test conditions including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. Always specify BZW04-299H for automotive applications requiring qualification evidence.
What is the maximum steady-state power dissipation for the BZW04-299?
The BZW04-299 has a steady-state power dissipation (PD) of 1 W at lead temperature (TL) = 75 °C, measured with 9.5 mm lead lengths mounted on 5 × 5 mm copper pads. This rating applies only to continuous DC power - the device is not intended for sustained power dissipation; its primary function is transient energy absorption, not steady-state regulation. The BZW04-299 relies on low duty-cycle surge events to avoid thermal runaway.
How does the temperature coefficient affect the BZW04-299's clamping behavior?
The BZW04-299 has a positive temperature coefficient for breakdown voltage (+0.110 %/°C), meaning its VBR and thus clamping voltage increase linearly with junction temperature. At 125 °C, VBR rises ~11% above its 25 °C value - ensuring the device remains inactive during normal elevated-temperature operation and triggers only during true overvoltage events. This behavior prevents false triggering in hot under-hood environments and is intrinsic to the BZW04-299's silicon structure.
BZW04-299 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):
- 299V
- Voltage - Breakdown (Min):
- 332V
- Voltage - Clamping (Max) @ Ipp:
- 482V
- Current - Peak Pulse (10/1000µs):
- 800mA
- 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)
BZW04-299 FAQ
1.How can I place an order for BZW04-299 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-299 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 BZW04-299 reliable?
The price and inventory of BZW04-299 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-299 is usually 5 days.
3.What payment methods are accepted for BZW04-299?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-299 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-299?
BZW04-299 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-299 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 BZW04-299?
For technical support, including BZW04-299 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-299 requirements.
6.How does Aetrix verify that BZW04-299 is sourced from the original manufacturer or authorized distributors?
All BZW04-299 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 BZW04-299 meets industry standards.
7.What is the process for return or replacement of BZW04-299?
All BZW04-299 units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-299, 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 BZW04-299 part is unused and in its original packaging.
Return procedure for BZW04-299:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04-299 Tags
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