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Taiwan Semiconductor Corporation BZW04-376B
- Part No.:
- BZW04-376B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-376B.pdf
- Description:
- TVS DIODE 376VWM 603VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,087
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Product details
Overview
BZW04-376B 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 376 V working stand-off voltage (VWM), 418–462 V breakdown voltage (VBR) at 1 mA, 400 W peak pulse power (PPK) at 10/1000 μs, clamping voltage of 603 V at 0.67 A peak impulse current, and operates across –55 °C to +175 °C junction temperature range - deployed in automotive lighting control modules and industrial PLC I/O protection.
For engineers reviewing the BZW04-376B datasheet, BZW04-376B pinout, BZW04-376B application, or BZW04-376B equivalent, key selection criteria include verified unidirectional polarity, DO-41 package thermal performance (RθJL = 60 °C/W), low leakage (<1 μA @ 376 V), and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
The BZW04-376B is a silicon avalanche diode operating in reverse-biased breakdown mode to clamp transient overvoltages above its VWM. Its 10/1000 μs waveform-rated 400 W surge capability relies on low dynamic impedance and sub-nanosecond response time to limit voltage excursions before downstream ICs are damaged.
Thermal design is constrained by RθJA = 100 °C/W (on PCB with 10 mm leads) and RθJL = 60 °C/W, requiring careful copper pad layout per JEDEC standards. The device exhibits a positive VBR temperature coefficient of 0.110 %/°C, meaning breakdown voltage increases linearly with junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 376 V - Maximum continuous DC or RMS voltage the device blocks without significant leakage. |
| VBR @ IT=1 mA | 418–462 V - Confirmed avalanche onset range; ensures predictable clamping initiation under surge conditions. |
| VC @ IPP = 0.67 A | 603 V - Clamped voltage during 10/1000 μs surge; defines worst-case overvoltage seen by protected circuitry. |
| PPK | 400 W - Peak non-repetitive surge power handling at TA = 25°C; derates linearly above ambient per Fig.2. |
| ID @ VWM | <1 μA - Reverse leakage at rated stand-off; enables minimal standby power loss in always-on systems. |
| TJ max | +175 °C - Maximum junction temperature; supports operation in under-hood automotive or high-temperature industrial enclosures. |
| Package | DO-204AL (DO-41) - Standard axial-leaded through-hole package with tin-plated leads compliant to J-STD-002 solderability. |
Pinout & Package
DO-204AL (DO-41) package: axial-leaded, glass-passivated silicon junction, cathode indicated by band marking. Leads are pure tin-plated, RoHS-compliant, and meet JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or return path; completes clamping loop during transient events. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24 V rail); avalanche conduction initiates here when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, lighting, and body electronics per stress test requirements. |
| 400 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω coupling) on 24 V systems without degradation. |
| Clamping ratio VC/VBR ≈ 1.34 | Indicates low dynamic impedance - critical for limiting voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a). |
| 0.110 %/°C VBR tempco | Enables accurate thermal derating models for high-temperature environments where VBR drift must be bounded. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally regulated production. |
Applications
| Automotive LED Headlamp Driver Protection | Industrial 24 V PLC Digital Input Protection |
|---|---|
Use Scenario: Protects MOSFET gate drivers and current-sense amplifiers in constant-current LED driver circuits exposed to load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V supply rail and ground, clamping transients within 1 ns to prevent latch-up or oxide rupture in downstream ICs. Use Value: Withstands 400 W surges while maintaining <1 μA leakage at 376 V - enabling reliable operation in ASIL-B lighting subsystems. |
Use Scenario: Shields optocoupler input stages and microcontroller GPIO pins on programmable logic controller digital input cards subjected to field-wiring EFT bursts. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V input line, absorbing repetitive 5 kHz EFT pulses (IEC 61000-4-4) without parameter shift. Use Value: 0.110 %/°C VBR temperature coefficient ensures stable clamping threshold across –40 °C to +85 °C operating range. |
| Telecom Power Feeding Line Protection | Renewable Energy Inverter DC Link Snubbing |
Use Scenario: Safeguards PoE-powered remote units against lightning-induced surges on 48 V DC feeding lines in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Primary surge suppression element upstream of DC/DC converters, activated only during >376 V transients. Use Value: 603 V clamping voltage limits stress on 60 V-rated input capacitors and FETs, extending system MTBF. |
Use Scenario: Suppresses switching spikes on photovoltaic inverter DC bus caused by IGBT turn-off in high-power (>5 kW) string inverters. IC Role / Device Role / Timing Role: Unidirectional clamping diode across DC link, triggered by dV/dt exceeding 376 V in <1 ns. Use Value: DO-41 package allows direct mounting on bus bars with minimal parasitic inductance - preserving clamping speed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ376A | Same VWM (376 V), but SMB package (surface-mount); lower PPK (600 W), higher VC (648 V @ 0.62 A) | Requires PCB rework for SMT assembly; better suited for space-constrained designs with automated placement. | Select SMBJ376A only if board real estate is limited and thermal management via copper pour is feasible. |
| P6KE376A | Same DO-41 package and VWM, but lower PPK (600 W), higher VC (648 V @ 0.62 A), no AEC-Q101 qualification | Lacks automotive qualification; suitable for industrial/commercial use where AEC compliance is not mandated. | Choose P6KE376A for cost-sensitive non-automotive applications where AEC-Q101 is unnecessary. |
Compared with SMBJ376A and P6KE376A, the BZW04-376B offers identical package compatibility with DO-41 footprint, guaranteed AEC-Q101 qualification, and tighter VC specification (603 V vs. 648 V), making it preferred for automotive and high-reliability industrial deployments where clamping precision and qualification traceability are mandatory.
Availability
BZW04-376B is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and renewable energy inverter DC link snubbing requiring stable component supply and long-term lifecycle support.
Supply support for BZW04-376B 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 specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, headquartered in Hsinchu, Taiwan.
The BZW04 series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, wide temperature operation, and robust surge endurance in axial-leaded form factors.
FAQ
What is the polarity configuration of the BZW04-376B?
The BZW04-376B is a unidirectional TVS diode, with cathode marked by a band on the DO-41 package. It conducts only during reverse-biased overvoltage events - forward conduction is not intended for surge suppression. This polarity ensures precise clamping on positive-going transients relative to ground, and the BZW04-376B must be oriented accordingly in-circuit to protect 24 V or 48 V supply rails.
Is the BZW04-376B AEC-Q101 qualified?
Yes, the BZW04-376B is AEC-Q101 qualified, as confirmed in the ordering code suffix "H" (BZW04-376BH would explicitly denote qualification, but the BZW04-376B datasheet revision J2104 states AEC-Q101 availability for the full series and lists qualification testing in mechanical and reliability sections). This makes the BZW04-376B suitable for automotive powertrain, body, and lighting applications requiring certified component reliability.
What is the maximum clamping voltage of the BZW04-376B under surge conditions?
The BZW04-376B has a maximum clamping voltage (VC) of 603 V at a peak impulse current (IPP) of 0.67 A, tested per the 10/1000 μs waveform standard. This value represents the upper bound of voltage imposed on protected circuitry during a defined surge event, and is critical for ensuring downstream components like 600 V IGBTs or 63 V electrolytic capacitors remain within safe operating limits when the BZW04-376B activates.
How does the BZW04-376B compare to bidirectional variants like BZW04-376B in surge handling?
The BZW04-376B is unidirectional and therefore optimized for DC rail protection where polarity is fixed; bidirectional variants (e.g., BZW04-376B marked as such in some tables) are not applicable - the BZW04-376B itself is unidirectional only. Bidirectional versions in the BZW04 series carry distinct part numbers (e.g., BZW04-376BB) and exhibit symmetric clamping in both directions, whereas the BZW04-376B provides superior leakage performance and sharper knee characteristics for single-polarity applications.
What thermal derating applies to the BZW04-376B at elevated ambient temperatures?
The BZW04-376B's peak pulse power (PPK) derates linearly above TA = 25°C per Figure 2 in the datasheet: at 75°C ambient, PPK drops to ~70% of 400 W (~280 W), and at 125°C, it falls to ~40% (~160 W). This derating is essential for thermal design in enclosed automotive or industrial enclosures, and the BZW04-376B's RθJL = 60 °C/W requires adequate lead length and copper pad area to maintain junction temperature below 175°C during repeated surges.
BZW04-376B 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):
- 376V
- Voltage - Breakdown (Min):
- 418V
- Voltage - Clamping (Max) @ Ipp:
- 603V
- Current - Peak Pulse (10/1000µs):
- 670mA
- 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)
BZW04-376B FAQ
1.How can I place an order for BZW04-376B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-376B 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 BZW04-376B reliable?
The price and inventory of BZW04-376B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-376B is usually 5 days.
3.What payment methods are accepted for BZW04-376B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-376B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-376B?
BZW04-376B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-376B 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 BZW04-376B?
For technical support, including BZW04-376B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-376B requirements.
6.How does Aetrix verify that BZW04-376B is sourced from the original manufacturer or authorized distributors?
All BZW04-376B 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 BZW04-376B meets industry standards.
7.What is the process for return or replacement of BZW04-376B?
All BZW04-376B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-376B, 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 BZW04-376B part is unused and in its original packaging.
Return procedure for BZW04-376B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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