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Taiwan Semiconductor Corporation BZW04-299B
- Part No.:
- BZW04-299B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-299B.pdf
- Description:
- TVS DIODE 299VWM 482VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:3,451
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Product details
Overview
BZW04-299B from Taiwan Semiconductor is a unidirectional transient voltage suppressor diode (TVS) 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) at 1 mA, 482 A peak pulse current (IPP), 400 W peak pulse power (PPK) at 10/1000 µs, and DO-204AL (DO-41) package - deployed in automotive lighting control modules to clamp load-dump transients.
For engineers reviewing the BZW04-299B datasheet, BZW04-299B pinout, BZW04-299B application, or BZW04-299B equivalent, key selection criteria include clamping voltage (VC = 482 V @ IPP), low leakage (<1 µA @ VWM), AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and unidirectional polarity marking for correct PCB orientation.
Technical Context
The BZW04-299B operates as a silicon avalanche diode with sharp reverse-breakdown characteristics, enabling sub-nanosecond response to EFT and lightning-induced surges. Its unidirectional configuration provides forward conduction capability while suppressing reverse transients up to 400 W.
Thermal design relies on its 175 °C maximum junction temperature and 60 °C/W junction-to-lead resistance, requiring adequate copper pad area (5 × 5 mm per terminal) for steady-state power dissipation (1 W at TL = 75 °C). The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 299 V - Maximum continuous DC or RMS voltage the device blocks without clamping; sets operating margin before transient activation. |
| VBR @ IT=1 mA | 332–368 V - Measured breakdown range confirming avalanche onset threshold; ensures consistent clamping initiation across production lots. |
| VC @ IPP=482 A | 482 V - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected downstream ICs. |
| PPK | 400 W - Peak transient energy handling capacity; validates suitability for ISO 7637-2 Pulse 5a (load dump) compliance testing. |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off; minimizes quiescent power loss and avoids false triggering in high-impedance circuits. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive environments without derating. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard PCB; informs heatsinking requirements for sustained surge duty cycles. |
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 JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / Surge return path | Connected to system ground or low-side reference; carries full surge current during clamping event. |
| Cathode | Protected line input / High-side connection | Connected to line being protected (e.g., battery rail); voltage referenced to anode during avalanche conduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock - required for powertrain and body electronics. |
| 400 W peak pulse rating | Supports single-event surge immunity per ISO 7637-2 Pulse 5a (load dump) up to 400 W without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on protected ICs - critical for 3.3 V or 5 V logic interfacing with 24 V systems. |
| <1 µA leakage @ VWM | Enables use in always-on circuits (e.g., CAN bus standby nodes) without measurable standby current penalty. |
| DO-41 mechanical robustness | Withstands 5 kgf axial pull force and meets JEDEC J-STD-020 moisture sensitivity level 1 - suitable for wave and reflow assembly. |
Applications
| Automotive Lighting Control | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and MOSFET gate drivers from load-dump transients in 24 V headlamp modules. IC Role / Device Role: Unidirectional TVS placed between battery rail and driver IC supply pin. Use Value: Limits clamped voltage to 482 V, preventing damage to 60 V-rated gate drivers during 120 V/350 ms load-dump events. |
Use Scenario: Safeguarding 24 V digital input channels against EFT bursts (IEC 61000-4-4) in programmable logic controllers. IC Role / Device Role: TVS mounted at connector entry point, shunting fast transients before signal conditioning circuitry. Use Value: Sub-ns response time and 482 V clamping ensure microcontroller GPIOs remain within absolute maximum ratings during ±2 kV EFT coupling. |
| DC Power Supply Input Stage | Telecom Power Feeding Circuits |
Use Scenario: Front-end surge suppression for 28 V avionics DC-DC converters exposed to lightning-induced surges. IC Role / Device Role: Primary clamping device on main input rail, coordinated with upstream fuse and inductor. Use Value: 400 W rating and 175 °C TJ max allow operation in sealed enclosures without forced air cooling during MIL-STD-461G CS117 pulses. |
Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras) from induced surges on 48 V phantom power lines. IC Role / Device Role: Unidirectional TVS on each power pair, referenced to local ground plane. Use Value: Low 1 µA leakage prevents interference with IEEE 802.3af/at current-sense detection, while 482 V VC limits stress on 100 V-rated DC-DC controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ280A | Same DO-214AC (SMA) package; 280 V VWM, 311–344 V VBR, 400 W PPK, but RθJA = 140 °C/W (higher thermal resistance). | Requires larger copper area for equivalent thermal performance; not AEC-Q101 qualified. | Select when DO-214AC footprint is fixed and automotive qualification is not required. |
| ON Semiconductor 1.5KE270A | DO-201AD package; 270 V VWM, 299–331 V VBR, 1500 W PPK, but higher VC = 433 V @ 3.5 A (lower IPP rating per watt). | Higher surge rating but lower energy density; less precise clamping for sensitive 24 V systems. | Select when higher single-pulse energy (1500 W) is prioritized over tight clamping voltage and automotive compliance. |
Compared with Littelfuse SMAJ280A and ON Semi 1.5KE270A, the BZW04-299B offers AEC-Q101 qualification, tighter VWM/VBR tolerance (±5%), lower clamping voltage (482 V vs. ≥433 V), and optimized thermal performance for DO-41 layouts - making it preferred for space-constrained, automotive-grade 24–28 V rail protection.
Availability
BZW04-299B is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and DC power supply input stage applications requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant surge protection.
Supply support for BZW04-299B 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 automotive, industrial, and consumer markets since 1979.
The BZW04 series was developed specifically for high-reliability transient suppression in automotive power systems, emphasizing AEC-Q101 qualification, tight parameter distribution, and robust thermal performance in legacy through-hole packages.
FAQ
What is the polarity configuration of the BZW04-299B?
The BZW04-299B is a unidirectional TVS diode, marked with a cathode band indicating the cathode terminal. It conducts in reverse bias during overvoltage events and blocks forward current like a standard rectifier diode. This configuration is essential for protecting positive-rail circuits where surge current must be shunted to ground - a key design requirement confirmed in the BZW04-299B datasheet's marking diagram and electrical characteristics table.
Is the BZW04-299B AEC-Q101 qualified?
Yes, the BZW04-299B is AEC-Q101 qualified, as explicitly stated in the "FEATURES" section and reinforced in the ordering information footnote ("H" suffix denotes AEC-Q101 qualification). This certification covers stress tests including high-temperature reverse bias, temperature cycling, and mechanical shock - validating its suitability for automotive powertrain and body electronics applications where the BZW04-299B is commonly deployed.
What is the clamping voltage of the BZW04-299B at its rated peak pulse current?
The BZW04-299B has a maximum clamping voltage (VC) of 482 V at a peak pulse current (IPP) of 482 A, measured under the standard 10/1000 µs waveform. This value is specified in the "MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS" table for the BZW04-299B variant and directly determines the overvoltage stress imposed on downstream components during surge events - a critical parameter for validating system-level surge immunity.
Can the BZW04-299B be used in bidirectional configurations?
No, the BZW04-299B is strictly unidirectional. While the BZW04 series includes bidirectional variants (e.g., BZW04-299BB), the "B" suffix in BZW04-299B denotes unidirectional construction with cathode-band polarity marking. Using it in a bidirectional application would result in forward conduction during negative transients, potentially damaging the device or failing to protect the circuit - a distinction clearly defined in the series' ordering code and electrical characteristics tables.
What is the thermal resistance of the BZW04-299B under standard PCB mounting conditions?
The BZW04-299B has a junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on a printed circuit board with 10 mm lead length, as specified in the "THERMAL PERFORMANCE" section. This value assumes standard FR-4 substrate and informs thermal design margins for applications involving repetitive surges or elevated ambient temperatures - a key parameter for ensuring reliable operation of the BZW04-299B in enclosed automotive or industrial enclosures.
BZW04-299B 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):
- 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)
BZW04-299B FAQ
1.How can I place an order for BZW04-299B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-299B 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 BZW04-299B reliable?
The price and inventory of BZW04-299B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-299B is usually 5 days.
3.What payment methods are accepted for BZW04-299B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-299B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-299B?
BZW04-299B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-299B 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 BZW04-299B?
For technical support, including BZW04-299B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-299B requirements.
6.How does Aetrix verify that BZW04-299B is sourced from the original manufacturer or authorized distributors?
All BZW04-299B 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 BZW04-299B meets industry standards.
7.What is the process for return or replacement of BZW04-299B?
All BZW04-299B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-299B, 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 BZW04-299B part is unused and in its original packaging.
Return procedure for BZW04-299B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04-299B Tags
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