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STMicroelectronics BZW04-376B
- Part No.:
- BZW04-376B
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
BZW04-376B.pdf
- Description:
- TVS DO15 376V 400W UNIDIR
- Quantity:
- Payment:
- Shipping:
Inventory:2,773
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Product details
Overview
BZW04-376B from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in DO-15 package, designed for high-energy ESD and surge protection in power rails and signal lines. It features a standoff voltage (VRM) of 376 V, clamping voltage (VCL) of 603 V at 0.8 A IPP (10/1000 µs), peak pulse power of 400 W, and operates up to 175 °C junction temperature - ideal for industrial power supplies and telecom interface protection.
For engineers reviewing the BZW04-376B datasheet, BZW04-376B pinout, BZW04-376B application, or BZW04-376B equivalent, key selection criteria include its 376 V reverse standoff rating, low dynamic resistance (105 Ω at 8/20 µs), bidirectional-capable variant availability (BZW04-376), IEC 61000-4-2 ±30 kV contact/air discharge compliance, and DO-15 mechanical compatibility with legacy through-hole layouts.
Technical Context
The BZW04-376B uses planar silicon junction technology optimized for low leakage (<1 µA at VRM) and stable clamping performance across –55 °C to +175 °C operating range. Its thermal design supports sustained reliability under repeated surges due to low thermal resistance (Rth(j-a) ≈ 3.5 °C/W with 4 cm² copper area) and high Tj max rating.
It delivers precise overvoltage response with defined breakdown voltage (VBR = 376–418 V at IBR = 1 mA), temperature coefficient αT = 11.0 × 10⁻⁴ /°C, and junction capacitance <70 pF at VR = 0 V (f = 1 MHz), making it suitable for high-voltage DC bus protection where minimal signal distortion and fast response are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 376 V - maximum continuous reverse working voltage before conduction begins; sets upper limit for protected circuit operating voltage. |
| Breakdown Voltage (VBR) | 376–418 V at 1 mA - precise threshold for avalanche onset; enables predictable clamping behavior in high-voltage systems. |
| Clamping Voltage (VCL) | 603 V at 0.8 A (10/1000 µs) - peak voltage seen by downstream circuit during surge; critical for ensuring load survival under IEC 61000-4-4 level 4 (4 kV). |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs), 2.3 kW (8/20 µs) - defines energy-handling capability; supports robust protection against lightning-induced transients and switching spikes. |
| Junction Temperature Range | –55 °C to +175 °C - enables deployment in harsh environments including industrial motor drives and outdoor telecom equipment. |
| ESD Withstand | ±30 kV air/contact discharge per IEC 61000-4-2 - exceeds level 4 requirements; eliminates need for external ESD staging in front-end interfaces. |
| Dynamic Resistance (RD) | 105 Ω (8/20 µs) - determines voltage rise slope under surge; lower RD improves clamping fidelity for sensitive downstream ICs. |
Pinout & Package
DO-15 (JEDEC DO-204AC) through-hole package with axial leads. Cathode marked by band on body; lead finish is matte tin plating. Compatible with wave and reflow soldering per J-STD-020 MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry / surge return path | Connected to ground or low-impedance return; forms current loop during transient conduction. |
| Cathode (banded end) | Protected line connection | Connected to line under protection (e.g., DC bus); avalanche conduction occurs when voltage exceeds VRM. |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature operation | Rated for continuous use up to +175 °C junction temperature - ensures long-term stability in enclosed power converters and motor controllers. |
| Low leakage current | <1 µA at VRM (376 V) - minimizes standby power loss and avoids false triggering in high-impedance sensing circuits. |
| Controlled clamping dynamics | VCL tolerance ±5 % and αT = 11.0 × 10⁻⁴ /°C - enables accurate thermal derating and predictable voltage limiting across temperature extremes. |
| Robust surge handling | 2.3 kW peak power (8/20 µs) - withstands high-current transients common in AC/DC front-ends and PoE injectors without degradation. |
| Industry-standard compliance | UL 497B certified (QVGQ2.E136224), IEC 61000-4-2/4-4 level 4, MIL-STD-883 compliant - meets safety and EMC requirements for industrial and telecom certifications. |
Applications
| Industrial Power Supply Protection | Telecom Line Interface |
|---|---|
|
Use Scenario: Protecting primary-side DC bus in 48 V telecom rectifiers against lightning-induced surges and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between +48 V rail and chassis ground to shunt transient energy before reaching DC-DC controllers. Use Value: Clamps to 603 V at 0.8 A, preventing damage to MOSFETs and PWM ICs rated for ≤650 V, while maintaining <1 µA leakage at nominal voltage. |
Use Scenario: Surge protection on Ethernet PSE (Power Sourcing Equipment) output lines compliant with IEEE 802.3bt. IC Role / Device Role / Timing Role: High-voltage TVS placed across each 57 V PoE pair to absorb 4 kV IEC 61000-4-4 transients without compromising data integrity. Use Value: Low 70 pF junction capacitance minimizes signal attenuation at 100 MHz, and 175 °C rating supports sealed outdoor enclosure operation. |
| Motor Drive DC Link Protection | Renewable Energy Inverter Input |
|
Use Scenario: Safeguarding IGBT gate drivers and bus capacitors in HVAC variable-frequency drives exposed to regenerative braking spikes. IC Role / Device Role / Timing Role: Mounted directly across DC link (+/-) to clamp voltage overshoots exceeding 400 V during rapid deceleration events. Use Value: 400 W (10/1000 µs) rating handles repetitive 100–200 µs spikes; DO-15 axial form factor allows direct PCB mounting near bus terminals. |
Use Scenario: Overvoltage protection on PV string inputs of solar microinverters subjected to grid fault transients and arc-flash events. IC Role / Device Role / Timing Role: Unidirectional TVS connected between PV+ and ground to suppress >1 kV transients induced by nearby lightning strikes. Use Value: 376 V VRM matches typical 600 V-class PV system ratings; UL 497B certification validates suitability for photovoltaic system safety standards. |
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 | DO-214AA (SMB) package; 376 V VRM; 603 V VCL (10/1000 µs); 600 W PPP; higher thermal resistance (~5.5 °C/W). | Suitable for surface-mount designs with space constraints; less effective in high-ambient-temperature through-hole assemblies. | Select SMBJ376A only if board layout mandates SMD footprint and thermal management includes ≥2 cm² copper pour. |
| P6KE376A | DO-15 package; same VRM/VCL; 600 W PPP; higher IRM (5 µA vs. 1 µA); no UL 497B listing. | Acceptable for cost-sensitive industrial controls where ESD certification is not mandated. | Prefer BZW04-376B where UL 497B, low leakage, or IEC 61000-4-2 ±30 kV compliance is required for regulatory approval. |
Compared with SMBJ376A and P6KE376A, BZW04-376B offers superior thermal performance in through-hole layouts, certified ESD robustness, and lowest leakage - making it the preferred choice for mission-critical high-voltage DC protection where reliability and certification alignment are mandatory.
Availability
BZW04-376B is available at Aetrix Electronics and suitable for industrial power supply protection, telecom line interface, and renewable energy inverter input applications requiring stable component supply, long-lifecycle support, and traceable sourcing for safety-critical deployments.
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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.
The BZW04 series belongs to ST's high-reliability TVS diode portfolio, engineered specifically for high-voltage transient suppression in demanding power conversion and infrastructure applications where thermal stability and certification compliance are non-negotiable.
FAQ
What is the maximum clamping voltage of BZW04-376B under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 603 V at an applied peak pulse current (IPP) of 0.8 A for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases with junction temperature at a rate defined by αT = 11.0 × 10⁻⁴ /°C, and must be thermally derated above 25 °C using the provided formula in DS0660 Rev 4.
Is BZW04-376B suitable for bidirectional surge protection?
No - BZW04-376B is unidirectional. For bidirectional protection at the same voltage rating, use BZW04-376 (no "B" suffix), which provides symmetrical clamping for AC-coupled or floating-line applications. The "B" suffix explicitly denotes unidirectional polarity with cathode marking.
Does BZW04-376B meet UL 497B requirements for telecom surge protection?
Yes - BZW04-376B carries UL 497B file number QVGQ2.E136224, certifying its suitability for primary-circuit surge protection in telecommunications equipment per ANSI/UL 497B Edition 5. This includes validation for use in PSE, DSLAM, and base station power interfaces.
What is the recommended PCB layout for optimal thermal performance?
Mount BZW04-376B using minimum 4 cm² (2 cm × 2 cm) copper area under each lead on FR4 PCB, per Figure 12 in DS0660 Rev 4. This reduces Rth(j-a) to ~3.5 °C/W, enabling full 400 W pulse power dissipation at Tj = 175 °C. Avoid narrow traces or thermal isolation that impedes heat spreading.
BZW04-376B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- BZW04, TRANSIL™
- Packaging:
- Cut Tape (CT)
- 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):
- 800mA
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 35pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
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.
BZW04-376B Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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