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Taiwan Semiconductor Corporation BZW04-376
- Part No.:
- BZW04-376
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-376.pdf
- Description:
- TVS DIODE 376VWM 603VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,179
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Product details
Overview
BZW04-376 from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode with a 376V working stand-off voltage (VWM), 418–462V breakdown voltage (VBR @ 1mA), and 603A peak pulse current (IPP) capability at 10/1000μs waveform - designed for high-energy surge protection in automotive power rails and industrial DC bus lines.
For engineers reviewing the BZW04-376 datasheet, BZW04-376 pinout, BZW04-376 application, or BZW04-376 equivalent, key selection criteria include clamping voltage (VC = 603V @ IPP), low leakage (<1μA @ VWM), AEC-Q101 qualification option (BZW04-376H), DO-41 package thermal performance (RθJA = 100°C/W), and unidirectional polarity marking.
Technical Context
The BZW04-376 operates as a silicon avalanche diode with fast response time (<1 ns) and low dynamic impedance, enabling effective clamping of EFT and lightning-induced transients on 24V–48V systems. Its 175°C maximum junction temperature and JESD201 Class 2 whisker resistance support under-hood automotive deployment.
It delivers 400W peak pulse power per 10/1000μs waveform with a clamping voltage of 603V at 603A, and exhibits a temperature coefficient of VBR = 0.110%/°C - critical for stable overvoltage protection across wide ambient ranges (-55°C to +175°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 376 V - Maximum continuous reverse operating voltage before conduction begins; defines system DC rail compatibility. |
| VBR @ IT=1mA | 418–462 V - Breakdown voltage range at 1mA test current; ensures reliable avalanche initiation above normal operating voltage. |
| VC @ IPP=603A | 603 V - Clamping voltage at rated peak pulse current; determines maximum voltage seen by protected downstream circuitry. |
| PPK | 400 W - Peak pulse power rating at 10/1000μs waveform; quantifies single-event surge energy absorption capability. |
| ID @ VWM | <1 μA - Reverse leakage current at 376V; ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| Package | DO-204AL (DO-41) - Standard axial-leaded package with 0.300g mass, UL 94V-0 molding, and tin-plated leads compliant with J-STD-002. |
| TJ max | +175°C - Maximum junction temperature; enables operation in engine compartment or industrial enclosures without derating. |
Pinout & Package
DO-204AL (DO-41) package: axial-leaded, cylindrical glass-passivated body with cathode band marking for unidirectional polarity. Leads are pure tin-plated and solderable per J-STD-002. Polarity is marked via cathode band; anode and cathode terminals are non-interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or low-voltage return path; forms current sink during transient clamp event. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24V rail); avalanche conduction occurs from cathode to anode when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified variant available (BZW04-376H) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for powertrain and body control modules. |
| 400W peak pulse power at 10/1000μs | Withstands IEC 61000-4-5 Level 4 surges (4kV line-earth, 2kV line-line) without degradation in 24V/48V systems. |
| Clamping voltage ≤603V @ 603A | Limits transient overvoltage to safe margin below IC absolute maximum ratings (e.g., <650V for 750V-rated MOSFETs). |
| Reverse leakage <1μA @ 376V | Prevents measurable power drain in always-on battery-connected circuits (e.g., CAN wake-up receivers, telematics). |
| DO-41 package with RθJA = 100°C/W | Enables direct PCB mounting on 5×5 mm copper pads for thermal management without heatsink in space-constrained applications. |
Applications
| Automotive Power Rail Protection | Industrial DC Bus Surge Suppression |
|---|---|
|
Use Scenario: Protecting 24V/48V battery-fed ECUs against load dump and alternator transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground, clamping transients within nanoseconds. Use Value: Limits peak voltage to ≤603V, preserving gate oxide integrity of downstream PMICs and microcontrollers. |
Use Scenario: Safeguarding PLC I/O modules connected to long field wiring exposed to induced lightning surges. IC Role / Device Role / Timing Role: Standoff protector on 24V sensor supply line, absorbing multi-kA transients without latch-up. Use Value: 400W rating sustains repeated 10/1000μs events per IEC 61000-4-5, extending field device MTBF. |
| LED Driver Overvoltage Clamp | Telecom Power Input Protection |
|
Use Scenario: Preventing catastrophic failure of constant-current LED drivers during AC/DC adapter output overshoot. IC Role / Device Role / Timing Role: Fast-acting shunt element across driver input capacitor, triggered only during overvoltage events. Use Value: Sub-1ns response time ensures clamping before driver IC internal LDO or FET fails. |
Use Scenario: Front-end protection for PoE-powered network switches subjected to Ethernet cable ESD and surge coupling. IC Role / Device Role / Timing Role: Primary-level TVS on 48V PSE input, coordinated with secondary-side protection. Use Value: Low leakage (<1μA) avoids false triggering of upstream current-limiting circuits during idle state. |
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 (376V), but SMB package (surface-mount); lower IPP (432A) and VC (610V); RθJA = 40°C/W (board-mounted). | Requires PCB rework for SMT layout; better thermal performance on dense boards but lacks axial lead mechanical robustness. | Select SMBJ376A only if automated assembly and board space constraints outweigh need for through-hole serviceability. |
| P6KE376A | Same DO-41 package and VWM, but lower PPK (600W), higher VC (640V), and higher ID (5μA @ VWM); not AEC-Q101 qualified. | Higher clamping voltage risks IC damage in tight-margin designs; unsuitable for automotive due to missing qualification. | Choose P6KE376A only for cost-sensitive industrial applications where 640V clamping and no AEC-Q101 requirement are acceptable. |
Compared with SMBJ376A and P6KE376A, the BZW04-376 offers optimal balance of axial-mount reliability, 603V clamping, sub-μA leakage, and AEC-Q101-ready variants - making it preferred for automotive and high-reliability industrial deployments where mechanical stability and precise voltage limiting are critical.
Availability
BZW04-376 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC bus surge suppression, and LED driver overvoltage clamp applications requiring stable component supply and long-term lifecycle continuity.
Supply support for BZW04-376 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 TVS diodes, rectifiers, and power devices since 1979.
The BZW04 series was developed specifically for high-energy transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, low leakage, and repeatable clamping performance across extreme temperature ranges.
FAQ
What is the clamping voltage of the BZW04-376 under maximum rated surge current?
The BZW04-376 has a maximum clamping voltage (VC) of 603 V when subjected to its rated peak pulse current (IPP) of 603 A at the 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during a worst-case transient event. The BZW04-376 maintains this clamping performance consistently across its specified operating temperature range.
Is the BZW04-376 suitable for automotive applications?
Yes - the BZW04-376H variant is explicitly AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias, temperature cycling, and ESD. The base BZW04-376 meets all electrical and thermal specifications required for under-hood use, including operation from –55°C to +175°C and robust surge handling per ISO 7637-2 Pulse 5a. Always specify "H" suffix for automotive-grade orders.
What is the difference between BZW04-376 and BZW04-376B?
BZW04-376 is the unidirectional version; BZW04-376B is its bidirectional counterpart. Both share identical VWM (376V), VBR (418–462V), and PPK (400W), but the BZW04-376B provides symmetrical clamping for AC-coupled or floating lines, while the BZW04-376 is optimized for DC rail-to-ground protection with cathode-marked polarity. Pinout and package are identical.
Does the BZW04-376 require a heatsink in typical applications?
No - the BZW04-376 is designed for self-contained operation in transient suppression roles. With a junction-to-ambient thermal resistance (RθJA) of 100°C/W on standard PCB pads (5×5 mm copper), and duty cycles limited to ≤4 pulses/minute per datasheet, heat dissipation remains negligible during short-duration surges. Heatsinking is unnecessary unless used in repetitive high-frequency surge environments outside spec.
What packaging options are available for the BZW04-376?
The BZW04-376 is supplied in DO-204AL (DO-41) package with two standard packing formats: 5,000 units per tape-and-reel (standard or "H" grade), and 3,000 units per ammo box (A0G variant). Tape-and-reel supports automated placement; ammo box is suited for manual or semi-automated assembly. All variants maintain identical electrical and mechanical specifications.
BZW04-376 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):
- 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)
BZW04-376 FAQ
1.How can I place an order for BZW04-376 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-376 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 BZW04-376 reliable?
The price and inventory of BZW04-376 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-376 is usually 5 days.
3.What payment methods are accepted for BZW04-376?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-376 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-376?
BZW04-376 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-376 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 BZW04-376?
For technical support, including BZW04-376 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-376 requirements.
6.How does Aetrix verify that BZW04-376 is sourced from the original manufacturer or authorized distributors?
All BZW04-376 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 BZW04-376 meets industry standards.
7.What is the process for return or replacement of BZW04-376?
All BZW04-376 units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-376, 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 BZW04-376 part is unused and in its original packaging.
Return procedure for BZW04-376:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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