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STMicroelectronics BZW50-15B
- Part No.:
- BZW50-15B
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- R-6, Axial
- Datasheet:
-
BZW50-15B.pdf
- Description:
- TVS DIODE 15VWM 35VC R6
- Quantity:
- Payment:
- Shipping:
Inventory:946
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Product details
Overview
BZW50-15B from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection in power and signal lines. It features a 15 V stand-off voltage (VRM), 16.6 V minimum breakdown voltage (VBR), 26.9 V clamping voltage (VCL) at 186 A peak pulse current (IPP) under 10/1000 µs waveform, and operates up to +175 °C junction temperature - deployed in industrial power supplies and telecom interface circuits.
For engineers reviewing the BZW50-15B datasheet, BZW50-15B pinout, BZW50-15B application, or BZW50-15B equivalent, key selection criteria include clamping performance at elevated temperature, bidirectional ESD robustness per IEC 61000-4-2 (30 kV contact/air), and compatibility with R6 axial package thermal management on FR4 PCBs.
Technical Context
The BZW50-15B uses planar silicon junction technology optimized for low leakage (<5 µA at VRM) and stable VBR/VCL over temperature (αT = 8.8 × 10⁻⁴ /°C). Its bidirectional structure enables symmetrical clamping on AC lines without polarity constraints.
It delivers 5000 W peak pulse power (10/1000 µs) and up to 35 kV surge immunity (8/20 µs), with dynamic resistance (RD) of 0.046 Ω enabling fast response to transients while maintaining low clamping overshoot under high di/dt conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 15 V - maximum continuous reverse operating voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 16.6 V min at 1 mA - precise threshold where avalanche conduction initiates reliably |
| Clamping Voltage (VCL) | 26.9 V at 186 A (10/1000 µs) - limits downstream voltage stress during surge events |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs) - defines maximum transient energy absorption capability |
| Junction Temperature Range | –55 °C to +175 °C - supports operation in harsh environments including industrial motor drives |
| ESD Robustness | 30 kV contact & air discharge (IEC 61000-4-2) - exceeds Level 4 for system-level ESD immunity |
| Leakage Current (IRM) | ≤5 µA at VRM - ensures minimal standby power loss in always-on circuits |
Pinout & Package
Package: R6 axial leaded package (8.6–9.1 mm diameter × 25.4 mm length), matte tin-plated leads, ECOPACK2 compliant, suitable for wave and reflow soldering per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 | Transient current entry (bidirectional) | One end of symmetrical P-N-P junction; accepts surge from either polarity |
| Cathode 1 | Transient current exit (bidirectional) | Opposite terminal of symmetrical junction; completes low-impedance path to ground or return |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR and VCL in both directions - eliminates polarity concerns in AC or differential line protection |
| High-temperature stability | VBR drift coefficient αT = 8.8 × 10⁻⁴ /°C - enables accurate clamping prediction across –55 °C to +175 °C |
| Low dynamic resistance | RD = 0.046 Ω - minimizes clamping voltage overshoot during fast-rising surges (e.g., lightning-induced) |
| Ultra-low leakage | IRM ≤ 5 µA at VRM - preserves signal integrity and battery life in low-power sensor interfaces |
Applications
| Industrial AC Power Input Protection | Telecom Line Interface (xDSL/PoE) |
|---|---|
|
Use Scenario: Protecting AC mains input stages of PLCs and motor drives against lightning-induced surges and switching transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across L-N and L/N-PE to clamp common-mode and differential-mode transients. Use Value: 26.9 V clamping at 186 A prevents damage to bridge rectifiers and upstream EMI filters while surviving repeated 5 kV surges. |
Use Scenario: Safeguarding xDSL line drivers and PoE injectors against induced surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Bidirectional TVS connected between tip/ring and ground to suppress longitudinal and transverse mode transients. Use Value: Symmetrical 30 kV ESD immunity and 5000 W surge rating meet GR-1089-CORE and IEEE 802.3bt requirements. |
| Automotive Body Control Module (BCM) Inputs | Smart Meter Communication Interfaces |
|
Use Scenario: Protecting LIN/CAN bus inputs and sensor supply lines in BCMs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Secondary TVS used alongside primary protection to handle residual transients after front-end filtering. Use Value: 175 °C max junction temperature ensures reliability under hood temperatures without derating. |
Use Scenario: Securing RS-485, M-Bus, and PLC communication ports in utility smart meters installed in outdoor enclosures. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pairs to maintain signal integrity during EFT bursts (IEC 61000-4-4 Level 4). Use Value: 4 kV EFT immunity and <5 µA leakage prevent false triggering and meter calibration drift over 20-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15CA | DO-214AA package; 15 V VRM; 24.4 V VCL @ 171 A (10/1000 µs); lower PPP (600 W) | Surface-mount only; unsuitable for high-current chassis-level protection requiring axial mounting | Select when board space is constrained and surge energy is ≤600 W |
| P6KE15CA | DO-15 package; 15 V VRM; 24.4 V VCL @ 171 A; 600 W PPP; higher IRM (10 µA) | Legacy through-hole; limited thermal mass; not rated for 175 °C operation | Choose only for cost-sensitive legacy designs with <1 kW surge exposure |
Compared with SMBJ15CA and P6KE15CA, the BZW50-15B provides 8.3× higher peak power handling, superior high-temperature stability, and axial R6 packaging optimized for mechanical robustness and heatsinking in industrial enclosures.
Availability
BZW50-15B is available at Aetrix Electronics and suitable for industrial power supplies, telecom line interfaces, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZW50-15B 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 microcontrollers for industrial, automotive, and consumer markets.
The BZW50 series belongs to ST's high-power TVS portfolio, engineered specifically for robust, high-reliability surge protection in mission-critical infrastructure where thermal resilience and repeatable clamping performance are mandatory.
FAQ
What is the maximum clamping voltage of BZW50-15B under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 26.9 V at 186 A peak pulse current under the standard 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases linearly with junction temperature at a coefficient of 8.8 × 10⁻⁴ /°C, reaching ~30.2 V at Tj = 125 °C.
Can BZW50-15B be used in place of unidirectional TVS diodes?
No - BZW50-15B is strictly bidirectional and lacks anode/cathode polarity marking for DC-biased applications. Using it in place of a unidirectional device (e.g., BZW50-15) would allow conduction during normal forward bias, potentially damaging upstream circuitry or causing latch-up.
What is the recommended PCB layout for optimal thermal performance?
Mount the R6 package with ≥3 cm² of 70 µm copper area under each lead, using thermal vias to inner ground planes. Maintain ≥2 mm clearance from adjacent heat sources. Per Figure 12 in DS0662, this reduces Rth(j-a) to ~35 °C/W, enabling full 5000 W surge capability at Tj ≤ 175 °C.
Does BZW50-15B meet UL 497B for telecom surge protection?
Yes - BZW50-15B carries UL 497B file number QVGQ2.E136224, certifying compliance for use in secondary circuit protection of telecommunications equipment, including isolation barrier applications meeting ANSI/UL 497B Edition 5 requirements.
BZW50-15B 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 15V
- Voltage - Breakdown (Min):
- 16.6V
- Voltage - Clamping (Max) @ Ipp:
- 35V
- Current - Peak Pulse (10/1000µs):
- 1714A (1.714kA) (8/20µs)
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 6750pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- R-6
BZW50-15B FAQ
1.How can I place an order for BZW50-15B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW50-15B 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 BZW50-15B reliable?
The price and inventory of BZW50-15B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW50-15B is usually 5 days.
3.What payment methods are accepted for BZW50-15B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW50-15B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW50-15B?
BZW50-15B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW50-15B 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 BZW50-15B?
For technical support, including BZW50-15B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW50-15B requirements.
6.How does Aetrix verify that BZW50-15B is sourced from the original manufacturer or authorized distributors?
All BZW50-15B 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 BZW50-15B meets industry standards.
7.What is the process for return or replacement of BZW50-15B?
All BZW50-15B units undergo pre-shipment inspection (PSI). If there is an issue with BZW50-15B, 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 BZW50-15B part is unused and in its original packaging.
Return procedure for BZW50-15B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW50-15B Tags
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onsemi
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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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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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