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STMicroelectronics BZW50-47B
- Part No.:
- BZW50-47B
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- R-6, Axial
- Datasheet:
-
BZW50-47B.pdf
- Description:
- TVS DIODE 47VWM 108VC R6
- Quantity:
- Payment:
- Shipping:
Inventory:396
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Product details
Overview
BZW50-47B from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection in power and signal lines. It delivers 5000 W peak pulse power (10/1000 µs), clamps at 83.2 V (max) under 60.1 A surge, and operates up to +175 °C junction temperature - enabling robust ESD and EFT protection in industrial power supplies and telecom interfaces.
For engineers reviewing the BZW50-47B datasheet, BZW50-47B pinout, BZW50-47B application, or BZW50-47B equivalent, key selection criteria include clamping voltage stability across temperature, bidirectional symmetry, low dynamic resistance (0.428 Ω), and compliance with IEC 61000-4-2 (±30 kV) and IEC 61000-4-4 level 4 (4 kV).
Technical Context
The BZW50-47B uses planar silicon junction technology optimized for low leakage (<5 µA at 47 V) and high thermal resilience. Its bidirectional structure ensures symmetrical clamping in AC-coupled or floating systems, with breakdown voltage tightly specified at 52 V (min) and 52 V (typ) at 1 mA.
Dynamic resistance of 0.428 Ω (10/1000 µs) enables rapid voltage limiting during fast transients, while its αT = 10.3 × 10−4/°C voltage temperature coefficient allows accurate clamping prediction across −55 °C to +175 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 47 V - maximum continuous reverse working voltage before conduction begins |
| Breakdown Voltage (VBR) | 52 V min at 1 mA - precise threshold where avalanche conduction initiates reliably |
| Clamping Voltage (VCL) | 83.2 V max at 60.1 A (10/1000 µs) - limits downstream circuit stress during surge events |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs) - sustains high-energy surges without failure in industrial environments |
| Leakage Current (IRM) | ≤5 µA at VRM - ensures minimal standby power loss and signal integrity in high-impedance circuits |
| Junction Temperature Range | −55 °C to +175 °C - supports operation in harsh thermal environments including motor drives and outdoor base stations |
| ESD Robustness | ±30 kV contact & air discharge (IEC 61000-4-2) - exceeds Level 4 for reliable human-body-model immunity |
Pinout & Package
Package: R6 - axial-lead, epoxy-encapsulated, matte tin-plated leads, compliant with UL94 V0 and J-STD-002 E3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 | Input terminal (bidirectional) | One side of symmetrical avalanche junction; connects to protected line (e.g., RS-485 A or AC phase) |
| Cathode 1 | Input terminal (bidirectional) | Other side of symmetrical junction; connects to same protected line (e.g., RS-485 B or AC neutral) |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR and VCL in both polarities - eliminates need for polarity-aware placement in AC or differential lines |
| High-temperature reliability | Rated for continuous operation up to +175 °C junction - maintains clamping performance in enclosed power converters |
| Low dynamic resistance | 0.428 Ω (10/1000 µs) - minimizes voltage overshoot during fast-rising transients like lightning-induced surges |
| Ultra-low leakage | ≤5 µA at 47 V - preserves signal fidelity in high-impedance sensor interfaces and precision analog front-ends |
| UL 497B certified | QVGQ2.E136224 listing - validates suitability for telecom and data line surge protection per industry safety standards |
Applications
| Industrial Power Supply Input Protection | RS-485 Data Line Transient Suppression |
|---|---|
|
Use Scenario: Protecting AC/DC converter inputs against lightning-induced surges and load dump transients in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional TVS placed across L-N and L/N-PE to clamp common-mode and differential-mode surges before rectification stage. Use Value: Clamps 60.1 A surge at ≤83.2 V, preventing damage to bridge rectifiers and bulk capacitors while maintaining UL 497B compliance. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers in building management systems exposed to ESD and cable coupling noise. IC Role / Device Role / Timing Role: Bidirectional TVS connected between A/B differential pair and ground to suppress ±30 kV ESD and 4 kV EFT bursts. Use Value: Symmetrical clamping ensures equal protection on both data lines without skew, preserving signal integrity at up to 10 Mbps. |
| Telecom DSL Line Interface Protection | AC Motor Drive Control Signal Isolation |
|
Use Scenario: Shielding ADSL/VDSL line drivers from induced surges on twisted-pair telephone lines entering customer premises equipment. IC Role / Device Role / Timing Role: TVS mounted at line interface connector to absorb longitudinal surges while minimizing capacitance impact on high-frequency signals. Use Value: Junction capacitance <100 pF at 1 V (per datasheet Fig. 8) avoids signal attenuation above 1 MHz, supporting VDSL2 profiles. |
Use Scenario: Protecting isolated gate driver enable/disable signals in variable-frequency AC motor drives subject to ground bounce and switching noise. IC Role / Device Role / Timing Role: Bidirectional TVS placed across optocoupler input pins to prevent latch-up from fast dv/dt transients on control PCBs. Use Value: Withstands repeated 10/1000 µs surges up to 5000 W while maintaining <5 µA leakage - avoids false triggering of safety logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ47CA | Same VRM (47 V), but lower PPP (600 W), higher VCL (77.0 V @ 77.5 A), SMC package | Limited to lower-energy surges; unsuitable for 5 kV IEC 61000-4-4 level 4 compliance | Select when board space is constrained and surge energy is ≤600 W; not drop-in for BZW50-47B's 5 kW rating |
| P6KE47CA | Same VRM (47 V), but older DO-15 package, higher VCL (84.5 V @ 59.2 A), lower Tj max (150 °C) | Reduced thermal margin in enclosed enclosures; fails IEC 61000-4-2 ±30 kV contact test per datasheet | Acceptable only for legacy designs with derated surge requirements and no UL 497B or high-Tj needs |
Compared with SMBJ47CA and P6KE47CA, the BZW50-47B provides 8.3× higher peak power handling, 175 °C junction rating for compact thermal design, and verified ±30 kV ESD immunity - making it the sole choice for industrial-grade 5 kW surge protection.
Availability
BZW50-47B is available at Aetrix Electronics and suitable for industrial power supply input protection, RS-485 data line transient suppression, telecom DSL line interface protection, and AC motor drive control signal isolation requiring stable component supply and long-term lifecycle assurance.
Supply support for BZW50-47B 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 solutions across automotive, industrial, and power electronics markets since 1987.
The BZW50 series belongs to ST's high-power TVS portfolio, engineered specifically for industrial-grade surge immunity in harsh environments - emphasizing thermal resilience, bidirectional symmetry, and international safety certification readiness.
FAQ
What is the maximum clamping voltage of BZW50-47B under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 83.2 V at 60.1 A for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases with junction temperature at a rate of 10.3 × 10−4/°C, reaching ~92.5 V at Tj = 125 °C per the datasheet's temperature correction formula.
Is BZW50-47B suitable for protecting Ethernet PHY interfaces?
No - BZW50-47B is not recommended for Ethernet PHY protection due to its junction capacitance (>100 pF at low bias, per Fig. 8), which would degrade signal integrity at 100BASE-TX or higher speeds. For Ethernet, ST's ESDALC6V1 or similar low-capacitance TVS arrays are appropriate alternatives.
Does BZW50-47B require heatsinking for continuous operation?
No dedicated heatsink is required for surge-only duty, but thermal management is critical for sustained high-temperature operation. At Tj = 175 °C, its power dissipation drops to 3700 W (10/1000 µs); PCB copper area under each lead directly lowers Rth(j-a), as shown in Fig. 12 - 4 cm² per lead reduces thermal resistance to ~2.5 °C/W.
How does the bidirectional marking differ from unidirectional versions?
Bidirectional units like BZW50-47B have identical markings on both ends and use red tape on both sides of the tape-and-reel packaging (per Fig. 19). Unidirectional variants feature a cathode bar marking and red/white tape orientation - confirming polarity-sensitive placement, unlike the symmetric layout required for BZW50-47B.
BZW50-47B 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):
- 47V
- Voltage - Breakdown (Min):
- 52V
- Voltage - Clamping (Max) @ Ipp:
- 108V
- Current - Peak Pulse (10/1000µs):
- 556A (8/20µs)
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 2050pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- R-6
BZW50-47B FAQ
1.How can I place an order for BZW50-47B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW50-47B 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 BZW50-47B reliable?
The price and inventory of BZW50-47B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW50-47B is usually 5 days.
3.What payment methods are accepted for BZW50-47B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW50-47B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW50-47B?
BZW50-47B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW50-47B 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 BZW50-47B?
For technical support, including BZW50-47B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW50-47B requirements.
6.How does Aetrix verify that BZW50-47B is sourced from the original manufacturer or authorized distributors?
All BZW50-47B 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 BZW50-47B meets industry standards.
7.What is the process for return or replacement of BZW50-47B?
All BZW50-47B units undergo pre-shipment inspection (PSI). If there is an issue with BZW50-47B, 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 BZW50-47B part is unused and in its original packaging.
Return procedure for BZW50-47B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW50-47B Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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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
-
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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D5V0L1B2WS-7
Diodes Incorporated
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