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STMicroelectronics BZW50-39B
- Part No.:
- BZW50-39B
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- R-6, Axial
- Datasheet:
-
BZW50-39B.pdf
- Description:
- TVS DIODE 39VWM 90VC R6
- Quantity:
- Payment:
- Shipping:
Inventory:547
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Product details
Overview
BZW50-39B from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection in power supply inputs, industrial I/O lines, and telecom interfaces. It delivers 5000 W peak pulse power (10/1000 µs), clamps at 69.4 V (max) under 72 A surge, and operates up to +175 °C junction temperature - enabling robust protection in harsh environments such as factory automation controllers and outdoor base station power rails.
For engineers reviewing the BZW50-39B datasheet, BZW50-39B pinout, BZW50-39B application, or BZW50-39B equivalent, key selection criteria include its 39 V stand-off voltage, bidirectional polarity, R6 axial package thermal performance, low dynamic resistance (0.299 Ω), and compliance with IEC 61000-4-2 level 4 (30 kV contact/air discharge) and IEC 61000-4-4 level 4 (4 kV).
Technical Context
The BZW50-39B uses planar silicon junction technology optimized for low leakage (<5 µA at 39 V) and stable clamping across -55 °C to +175 °C operating range. Its bidirectional architecture enables symmetrical surge suppression on AC-coupled or floating signal/power lines without polarity constraints.
It exhibits a voltage temperature coefficient of +10.1 × 10⁻⁴ /°C, allowing predictable VBR and VCL drift over temperature, and supports high-reliability mounting via matte tin–plated leads compatible with J-STD-002 and MIL-STD-750 soldering standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 39 V - maximum continuous reverse working voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 43.3 V min at 1 mA - precise threshold where avalanche conduction initiates reliably |
| Clamping Voltage (VCL) | 69.4 V max at 72 A (10/1000 µs) - limits downstream circuit stress during surge events |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs) - sustains high-energy transients common in industrial power surges |
| Dynamic Resistance (RD) | 0.299 Ω - ensures minimal voltage overshoot under fast-rising current transients |
| Junction Temperature Range | -55 °C to +175 °C - enables operation in engine compartments, power converters, and outdoor enclosures |
| ESD Robustness | 30 kV contact & air discharge (IEC 61000-4-2 level 4) - exceeds automotive and industrial ESD immunity requirements |
Pinout & Package
The BZW50-39B is housed in the R6 axial leaded package (DO-201AD), featuring two electrically identical terminals with no polarity marking for bidirectional operation. Leads are matte tin–plated per JESD 22-B102 E3 and MIL-STD-750 method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Surge current entry (negative half-cycle) | Conducts during negative voltage transients; symmetric with Terminal 2 |
| Cathode (Terminal 2) | Surge current entry (positive half-cycle) | Conducts during positive voltage transients; symmetric with Terminal 1 |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature reliability | Rated for continuous operation up to +175 °C junction temperature, reducing derating needs in thermally constrained designs |
| Low dynamic resistance | 0.299 Ω ensures tight clamping window and minimal overshoot during fast 8/20 µs surges |
| Bidirectional symmetry | Identical VBR, VCL, and IPP ratings for both polarities - simplifies layout on AC or floating lines |
| Low leakage current | <5 µA at 39 V enables use in high-impedance sensing and battery-backed circuits without loading error |
| UL 497B certified | QVGQ2.E136224 listing confirms suitability for telecom and data line surge protection per UL safety standards |
Applications
| Industrial PLC I/O Protection | AC Power Input Clamping |
|---|---|
Use Scenario: Protecting 24 V DC digital input modules in programmable logic controllers against induced surges from relay coil switching and nearby motor drives. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed across input terminals to clamp ±1 kV fast transients before they reach optocoupler or MCU input pins. Use Value: Prevents false triggering and latch-up by limiting voltage to 69.4 V during 72 A 10/1000 µs surges - within safe margin of 80 V input stage rating. | Use Scenario: Suppressing lightning-induced surges on 120/230 V AC mains inputs of switch-mode power supplies in medical equipment. IC Role / Device Role / Timing Role: Primary-level TVS connected line-to-neutral to absorb differential-mode surges before bridge rectifier and bulk capacitor. Use Value: Withstands 5000 W (10/1000 µs) and 60 kW (8/20 µs), providing coordinated protection alongside MOVs and fuses per IEC 61000-4-4 level 4. |
| Telecom Line Interface | Automotive Body Control Module |
Use Scenario: Safeguarding RS-485 transceivers in building automation networks exposed to cable-borne ESD and inductive coupling. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pair (A/B) to suppress ±30 kV contact ESD per IEC 61000-4-2 without polarity biasing. Use Value: Low 0.299 Ω dynamic resistance minimizes signal distortion during ESD events, preserving data integrity up to 10 Mbps. | Use Scenario: Protecting LIN bus nodes and sensor inputs in body control modules subjected to load dump and jump-start transients. IC Role / Device Role / Timing Role: Secondary-level TVS on 12 V supply rail feeding microcontrollers and CAN/LIN transceivers. Use Value: Operates reliably at +175 °C ambient, matching under-hood thermal profiles while clamping load dump spikes below 70 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ39CA | Lower peak power (600 W vs. 5000 W), smaller SMB package, higher clamping (67.2 V @ 5.3 A) | Targeted at low-energy signal-line protection; insufficient for power rail surges >1 kW | Select only for space-constrained, low-surge applications where PCB area is critical and energy levels remain below 1 kW |
| P6SMB39CA | Same 600 W rating, identical SMB footprint, slightly lower VBR (43.3 V min same), but lower Tj max (150 °C) | Limited to ambient temperatures ≤125 °C; not rated for under-hood or high-temp industrial use | Prefer when cost sensitivity outweighs thermal or energy requirements, and operating environment stays below 125 °C |
Compared with SMBJ39CA and P6SMB39CA, the BZW50-39B provides 8.3× higher surge power handling and 25 °C higher junction temperature rating - making it uniquely suitable for primary-side power rail protection where thermal and energy margins are non-negotiable.
Availability
BZW50-39B is available at Aetrix Electronics and suitable for industrial PLC I/O protection, AC power input clamping, and telecom line interface applications requiring stable component supply across extended product lifecycles and high-reliability manufacturing.
Supply support for BZW50-39B 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, delivering innovative analog, power, and microcontroller solutions for industrial, automotive, and consumer markets.
The BZW50 series belongs to ST's high-power TVS portfolio, engineered specifically for primary-level surge immunity in industrial power systems, telecom infrastructure, and automotive electronics where sustained energy absorption and extreme temperature resilience are mandatory.
FAQ
What is the maximum clamping voltage of BZW50-39B at 72 A?
The maximum clamping voltage (VCL) of BZW50-39B is 69.4 V when subjected to a 10/1000 µs surge current of 72 A, measured at Tamb = 25 °C. This value increases linearly with junction temperature at +10.1 × 10⁻⁴ /°C, reaching ~72.5 V at Tj = 125 °C per datasheet Equation 2.
Is BZW50-39B unidirectional or bidirectional?
BZW50-39B is a bidirectional TVS diode, indicated by the "B" suffix in its part number. It provides symmetrical clamping for both positive and negative voltage transients, with identical VBR, VCL, and IPP ratings in either polarity - ideal for AC lines, differential buses, and floating grounds.
Can BZW50-39B replace a MOV in AC surge protection?
BZW50-39B is not a direct MOV replacement due to lower energy absorption per event (5000 W vs. typical MOVs >100 J), but it complements MOVs as a fast-response, low-clamping secondary protector. It excels in precision clamping where voltage overshoot must be minimized - e.g., downstream of an MOV in multi-stage AC input protection.
What is the R6 package's thermal resistance to ambient?
For the R6 package (DO-201AD) used by BZW50-39B, the thermal resistance junction-to-ambient (Rth(j-a)) is 40 °C/W on a standard FR4 PCB with 70 µm copper and 1 cm² copper area per lead, per Figure 12 in DS0662 Rev 8. With 5 cm² copper, Rth(j-a) drops to ~20 °C/W, enabling full 5000 W rating at elevated ambient temperatures.
BZW50-39B 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):
- 39V
- Voltage - Breakdown (Min):
- 43.3V
- Voltage - Clamping (Max) @ Ipp:
- 90V
- Current - Peak Pulse (10/1000µs):
- 667A (8/20µs)
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 2400pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- R-6
BZW50-39B FAQ
1.How can I place an order for BZW50-39B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW50-39B 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 BZW50-39B reliable?
The price and inventory of BZW50-39B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW50-39B is usually 5 days.
3.What payment methods are accepted for BZW50-39B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW50-39B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW50-39B?
BZW50-39B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW50-39B 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 BZW50-39B?
For technical support, including BZW50-39B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW50-39B requirements.
6.How does Aetrix verify that BZW50-39B is sourced from the original manufacturer or authorized distributors?
All BZW50-39B 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 BZW50-39B meets industry standards.
7.What is the process for return or replacement of BZW50-39B?
All BZW50-39B units undergo pre-shipment inspection (PSI). If there is an issue with BZW50-39B, 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 BZW50-39B part is unused and in its original packaging.
Return procedure for BZW50-39B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW50-39B Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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Diodes Incorporated
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