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STMicroelectronics BZW50-56
- Part No.:
- BZW50-56
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- R-6, Axial
- Datasheet:
-
BZW50-56.pdf
- Description:
- TVS DIODE 56VWM 129VC R6
- Quantity:
- Payment:
- Shipping:
Inventory:706
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Product details
Overview
BZW50-56 from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection in power supply and interface lines. It delivers 5000 W peak pulse power (10/1000 µs), clamps at 99.6 V (max) under 50 A surge current, and operates up to 175 °C junction temperature - deployed in industrial AC/DC front-ends and telecom power rails.
For engineers reviewing the BZW50-56 datasheet, BZW50-56 pinout, BZW50-56 application, or BZW50-56 equivalent, key selection criteria include clamping voltage vs. surge current, temperature coefficient of breakdown voltage (10.4 × 10⁻⁴ /°C), dynamic resistance (0.617 Ω), leakage current ≤5 µA at 56 V, and R6 axial package compatibility with high-power PCB layouts.
Technical Context
The BZW50-56 employs planar silicon junction technology optimized for low leakage (<5 µA at VRM) and stable clamping over temperature (αT = 10.4 × 10⁻⁴ /°C). Its unidirectional polarity enables asymmetric surge handling in DC-biased lines, with forward voltage drop ≤3 V at 500 A non-repetitive surge.
It meets IEC 61000-4-2 Level 4 (30 kV contact/air discharge) and IEC 61000-4-4 Level 4 (4 kV), supported by 175 °C maximum junction temperature rating and UL 497B certification (QVGQ2.E136224) for telecom and industrial safety compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 56 V - Maximum continuous reverse operating voltage before conduction begins |
| Breakdown Voltage (VBR) | 62.2 V min at 1 mA - Confirmed avalanche initiation threshold at 25 °C |
| Clamping Voltage (VCL) | 99.6 V max at 50 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs) - Sustained surge energy dissipation capability at 25 °C ambient |
| Dynamic Resistance (RD) | 0.617 Ω - Determines VCL rise slope with increasing IPP; critical for precision clamping design |
| Leakage Current (IRM) | ≤5 µA at 56 V - Ensures minimal standby power loss in high-impedance sensing or battery-backed circuits |
| Temperature Coefficient (αT) | 10.4 × 10⁻⁴ /°C - Quantifies VBR drift with junction temperature; used for derating above 25 °C |
Pinout & Package
The BZW50-56 is housed in the R6 axial leaded package (JEDEC DO-201AD), featuring two terminals: anode and cathode. Cathode identified by a painted band; leads are matte tin-plated per J-STD-002 and MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path | Connected to ground or low-side reference; carries full surge current during clamping |
| Cathode | Protected line connection | Connected to the line being protected (e.g., +48 V telecom rail); blocks reverse leakage until VBR exceeded |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature operation | Rated for continuous use up to 175 °C junction temperature - enables placement near hot components like MOSFETs or transformers |
| Low dynamic resistance | 0.617 Ω - minimizes clamping voltage overshoot under fast-rising surges (e.g., lightning-induced transients) |
| UL 497B certified | File QVGQ2.E136224 - validates suitability for primary-side telecom surge protection per industry safety standards |
| IEC 61000-4-2 Level 4 immunity | 30 kV contact/air discharge - exceeds standard requirements for rugged industrial HMI and control panel interfaces |
Applications
| Industrial AC/DC Power Supply Input | Telecom DC Power Distribution |
|---|---|
Use Scenario: Protection of rectified AC input stage against lightning-induced surges and load dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed across bulk capacitor input to clamp positive-going overvoltage spikes. Use Value: Limits voltage to ≤99.6 V during 50 A 10/1000 µs surge, preventing damage to bridge rectifier and PFC controller ICs. | Use Scenario: Surge suppression on +48 V DC distribution bus in central office equipment. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between bus and chassis ground to absorb repetitive EFT bursts. Use Value: Withstands ≥30 kV ESD per IEC 61000-4-2 and maintains <5 µA leakage at 48 V, preserving bus efficiency. |
| Automotive Body Control Module (BCM) Power Input | Industrial PLC Analog Input Protection |
Use Scenario: Protection of 12 V supply rail in BCM against ISO 7637-2 pulse 1 and pulse 3a transients. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at connector entry point to shunt negative transients to ground. Use Value: Clamps reverse surges to ≤3 V forward drop at 500 A, safeguarding LDO regulators and microcontroller power pins. | Use Scenario: Overvoltage guard for 4–20 mA current loop inputs exposed to field wiring faults. IC Role / Device Role / Timing Role: Low-leakage TVS placed across input terminals to prevent op-amp saturation during sensor cable ESD events. Use Value: Leakage <5 µA at 24 V ensures analog accuracy; 99.6 V clamping avoids tripping upstream protection fuses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ58A | Lower PPP (600 W), smaller SMB package, 58 V VRM, 93.6 V VCL @ 5.4 A | Targeted at lower-energy signal-line protection; insufficient for 5000 W front-end surges | Select only for space-constrained, low-surge environments where R6 footprint is unacceptable |
| P6KE62A | Same R6 package, 62 V VRM, 102 V VCL @ 49 A, but rated for 600 W (10/1000 µs) | Limited to legacy designs; lacks UL 497B and IEC 61000-4-2 Level 4 validation | Use only if cost sensitivity outweighs surge margin and certification requirements |
Compared with SMBJ58A and P6KE62A, the BZW50-56 uniquely combines 5000 W surge capacity, UL 497B listing, and 175 °C operation - making it the sole choice for certified, high-reliability front-end protection in telecom and industrial power systems.
Availability
BZW50-56 is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, telecom DC distribution systems, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for BZW50-56 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
The BZW50 series belongs to ST's high-power TVS diode product line, engineered specifically for robust front-end surge protection in harsh-environment power conversion and infrastructure equipment.
FAQ
What is the maximum clamping voltage of BZW50-56 under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 99.6 V when subjected to a 50 A peak pulse current with a 10/1000 µs waveform at 25 °C. This value increases with junction temperature per the αT coefficient (10.4 × 10⁻⁴ /°C), and must be derated for elevated thermal conditions in high-power layouts.
Is BZW50-56 RoHS-compliant and halogen-free?
Yes - BZW50-56 is manufactured in ST's ECOPACK2-compliant R6 package, meeting RoHS Directive 2011/65/EU and JEDEC JS709C halogen-free requirements. Lead finish is matte tin plating, and the device carries the "E2" ECOPACK grade marking per ST's environmental compliance documentation.
Can BZW50-56 be used in bidirectional surge protection applications?
No - BZW50-56 is a unidirectional TVS diode, intended for DC-biased lines where surge polarity is known (e.g., positive rail to ground). For AC or bipolar signal lines, the bidirectional variant BZW50-56B must be used, which provides symmetrical clamping in both directions.
What is the recommended PCB layout for optimal thermal performance?
Mount BZW50-56 using minimum 3 cm² copper area per lead on FR4 board (70 µm Cu thickness) to achieve Rth(j-a) ≈ 40 °C/W. Avoid narrow traces; use thermal relief pads and ensure ≥5 mm clearance from adjacent heat sources to maintain Tj ≤175 °C under full 5000 W surge duty.
BZW50-56 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- R-6, Axial
- Series:
- BZW50, TRANSIL™
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 56V
- Voltage - Breakdown (Min):
- 62.2V
- Voltage - Clamping (Max) @ Ipp:
- 129V
- Current - Peak Pulse (10/1000µs):
- 465A (8/20µs)
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 3400pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- R-6
BZW50-56 FAQ
1.How can I place an order for BZW50-56 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW50-56 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 BZW50-56 reliable?
The price and inventory of BZW50-56 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW50-56 is usually 5 days.
3.What payment methods are accepted for BZW50-56?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW50-56 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW50-56?
BZW50-56 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW50-56 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 BZW50-56?
For technical support, including BZW50-56 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW50-56 requirements.
6.How does Aetrix verify that BZW50-56 is sourced from the original manufacturer or authorized distributors?
All BZW50-56 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 BZW50-56 meets industry standards.
7.What is the process for return or replacement of BZW50-56?
All BZW50-56 units undergo pre-shipment inspection (PSI). If there is an issue with BZW50-56, 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 BZW50-56 part is unused and in its original packaging.
Return procedure for BZW50-56:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW50-56 Tags
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