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STMicroelectronics BZW50-150B
- Part No.:
- BZW50-150B
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- R-6, Axial
- Datasheet:
-
BZW50-150B.pdf
- Description:
- TVS DIODE 150VWM 343VC R6
- Quantity:
- Payment:
- Shipping:
Inventory:288
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Product details
Overview
BZW50-150B from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 150 V stand-off voltage (VRM), 166 V minimum breakdown voltage (VBR), 269 V maximum clamping voltage (VCL) at 19 A (10/1000 µs), and 343 A peak pulse current (IPP) under 8/20 µs waveform - enabling robust IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-4 level 4 (4 kV) compliance in industrial power supplies and telecom infrastructure.
For engineers reviewing the BZW50-150B datasheet, BZW50-150B pinout, BZW50-150B application, or BZW50-150B equivalent, key selection criteria include clamping performance at elevated junction temperature (up to 175 °C), low dynamic resistance (4.50 Ω), bidirectional symmetry, R6 package thermal robustness, and compatibility with FR4 PCB layouts requiring ≥2 cm² copper per lead for optimal thermal management.
Technical Context
The BZW50-150B employs planar silicon junction technology optimized for low leakage (<5 µA at VRM) and stable VBR/VCL over temperature (αT = 10.8 × 10⁻⁴ /°C). Its bidirectional structure provides symmetrical clamping in both polarities without polarity sensitivity, making it suitable for AC-coupled or floating bus protection where ground-referenced unidirectional devices are unsuitable.
It delivers 5000 W peak pulse power (10/1000 µs) at 25 °C, derating to 3700 W at Tj = 175 °C per Figure 3. The 8/20 µs capability reaches 60 kW, supported by low dynamic resistance (4.50 Ω) and fast response time (<1 ns), ensuring effective suppression of lightning-induced surges and switching transients in telecom line cards and PoE injectors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 150 V - Maximum continuous reverse operating voltage before significant leakage begins; defines system operating margin. |
| Breakdown Voltage (VBR) | 166 V min @ IBR = 1 mA - Confirmed avalanche initiation threshold; ensures predictable turn-on during overvoltage events. |
| Clamping Voltage (VCL) | 269 V max @ IPP = 19 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; determines downstream component stress. |
| Peak Pulse Current (IPP) | 343 A @ 8/20 µs - Maximum surge current the device safely clamps without failure; validates IEC 61000-4-5 compliance. |
| Dynamic Resistance (RD) | 4.50 Ω - Low incremental resistance during conduction; minimizes VCL rise under increasing IPP, improving protection margin. |
| Junction Temperature Range | –55 °C to +175 °C - Enables operation in harsh environments such as industrial motor drives and outdoor base stations. |
| Leakage Current (IRM) | ≤5 µA @ VRM - Ensures minimal standby power loss and signal integrity in high-impedance sensing circuits. |
Pinout & Package
The BZW50-150B is housed in the axial-leaded R6 package (DO-201AD), with two terminals: anode and cathode marked by a cathode band on unidirectional variants; bidirectional versions (denoted by "B") have no polarity marking and exhibit symmetrical electrical behavior across both terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction; reference node for bidirectional clamping | Serves as one side of symmetrical avalanche path; connects to line or signal trace requiring bidirectional overvoltage protection. |
| Cathode | Current exit terminal during forward conduction; reference node for bidirectional clamping | Completes symmetrical clamping path; ties to same reference plane (e.g., chassis ground or common return) as anode for balanced transient shunting. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR, VCL, and IPP in both directions - eliminates polarity installation errors and supports AC/DC floating systems. |
| High-temperature surge capability | 3700 W peak pulse power at Tj = 175 °C - maintains protection integrity in thermally constrained enclosures like sealed power converters. |
| Low dynamic resistance | 4.50 Ω - reduces clamping voltage overshoot under high di/dt surges, preserving margin for 200 V-rated downstream ICs. |
| IEC 61000-4-2 Level 4 compliance | ±30 kV air/contact discharge - qualifies for front-panel ESD protection in industrial HMIs and field-deployable instrumentation. |
| R6 mechanical robustness | Lead pitch 25.4 mm, body diameter 8.6–9.1 mm - supports high-vibration mounting and manual rework while maintaining creepage/clearance for 300 V RMS applications. |
Applications
| Industrial Power Supply Input Protection | Telecom Line Card Surge Suppression |
|---|---|
Use Scenario: Protecting AC/DC converter inputs against lightning-induced surges and load dump transients in DIN-rail mounted PSUs. IC Role / Device Role / Timing Role: Primary shunt protector placed across input bulk capacitor terminals to clamp transients before they reach rectifier and controller stages. Use Value: 269 V clamping at 19 A ensures MOSFETs and bridge rectifiers rated for 400 V withstand repeated 4 kV IEC 61000-4-4 surges without degradation. |
Use Scenario: Safeguarding Ethernet PHY interfaces and analog front-ends in carrier-grade DSLAMs exposed to induced surges on twisted-pair lines. IC Role / Device Role / Timing Role: Bidirectional TVS placed differential-mode across tip/ring pairs to suppress common-mode and differential-mode transients simultaneously. Use Value: Symmetrical 150 V VRM and <5 µA leakage preserve signal integrity in 10/100BASE-TX receivers while surviving ±30 kV ESD events. |
| PoE Injector Port Protection | Automotive Body Control Module (BCM) Power Rail |
Use Scenario: Securing 48 V DC power delivery ports in IEEE 802.3af/at/bt-compliant PoE injectors against cable coupling and hot-swap transients. IC Role / Device Role / Timing Role: High-power TVS connected between PSE output and isolation transformer primary to absorb energy from open-circuit disconnect events. Use Value: 5000 W (10/1000 µs) rating handles >10× typical PoE surge energy, reducing need for cascaded protection and minimizing board space. |
Use Scenario: Protecting 12 V battery-fed microcontrollers and CAN transceivers in BCMs subjected to load dump (ISO 7637-2 Pulse 5a) and jump-start spikes. IC Role / Device Role / Timing Role: Secondary-level TVS on 12 V rail downstream of main load-dump suppressor to catch residual transients and ESD from user interfaces. Use Value: 175 °C max junction temperature enables direct placement near heat-generating power regulators without derating penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ150CA | Lower peak pulse power (600 W vs. 5000 W), smaller SMB package, higher VCL (243 V @ 13.9 A) | Targeted at low-energy signal-line protection; insufficient for mains-input or PoE port-level surges | Select only when surge energy is limited to <100 mJ and board space constraints prohibit R6 footprint. |
| 1.5KE150CA | Same R6 package, but glass-passivated junction; lower IRM (10 µA vs. 5 µA), higher RD (5.2 Ω), no ECOPACK compliance | Legacy industrial designs with legacy qualification requirements; lacks IEC 61000-4-2 Level 4 validation | Prefer only for cost-sensitive replacements in non-certified equipment where RoHS/ECOPACK is not mandated. |
Compared with SMBJ150CA and 1.5KE150CA, BZW50-150B delivers 8.3× higher peak power, tighter leakage control, and certified ESD/surge immunity - making it the sole choice for safety-critical, high-reliability DC power rail protection where sustained thermal stability and international compliance are mandatory.
Availability
BZW50-150B is available at Aetrix Electronics and suitable for industrial power supply input protection, telecom line card surge suppression, and PoE injector port protection requiring stable component supply, long-term lifecycle support, and full compliance documentation traceability.
Supply support for BZW50-150B 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 automotive, industrial, and consumer markets.
The BZW50 series belongs to ST's high-power TVS portfolio, engineered specifically for robust, high-temperature, high-energy transient suppression in mission-critical power conversion and communication infrastructure applications.
FAQ
What is the maximum clamping voltage of BZW50-150B under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 269 V at 19 A for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases linearly with junction temperature using αT = 10.8 × 10⁻⁴ /°C, reaching ~292 V at Tj = 125 °C per the VCL temperature coefficient formula in DS0662.
Can BZW50-150B be used in place of a unidirectional TVS like BZW50-150?
No - BZW50-150B is bidirectional and lacks polarity marking, while BZW50-150 is unidirectional with a cathode band. Substitution requires verifying circuit topology: bidirectional use is mandatory for AC-coupled or floating nodes; unidirectional parts must retain correct anode/cathode orientation relative to ground.
Does BZW50-150B meet UL 497B certification?
Yes - it carries UL 497B file number QVGQ2.E136224, certifying suitability for primary circuit protection in telecommunications and data equipment per UL 497B Annex D requirements, including impulse withstand and flammability (UL94 V0).
What PCB layout practices optimize thermal performance for BZW50-150B?
Mount the R6 package with ≥2 cm² of 70 µm copper per lead (per Figure 12), avoid thermal relief on pads, and ensure ≥3 mm clearance to adjacent components. Use FR4 with internal ground planes connected via multiple vias to reduce Rth(j-a) from 4.5 °C/W (no copper) to <2.0 °C/W, enabling full 5000 W surge capability at ambient ≤70 °C.
BZW50-150B 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):
- 150V
- Voltage - Breakdown (Min):
- 166V
- Voltage - Clamping (Max) @ Ipp:
- 343V
- Current - Peak Pulse (10/1000µs):
- 175A (8/20µs)
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 850pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- R-6
BZW50-150B FAQ
1.How can I place an order for BZW50-150B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW50-150B 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 BZW50-150B reliable?
The price and inventory of BZW50-150B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW50-150B is usually 5 days.
3.What payment methods are accepted for BZW50-150B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW50-150B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW50-150B?
BZW50-150B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW50-150B 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 BZW50-150B?
For technical support, including BZW50-150B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW50-150B requirements.
6.How does Aetrix verify that BZW50-150B is sourced from the original manufacturer or authorized distributors?
All BZW50-150B 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 BZW50-150B meets industry standards.
7.What is the process for return or replacement of BZW50-150B?
All BZW50-150B units undergo pre-shipment inspection (PSI). If there is an issue with BZW50-150B, 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 BZW50-150B part is unused and in its original packaging.
Return procedure for BZW50-150B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW50-150B 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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Diodes Incorporated
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D12V0L1B2LP-7B
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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