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STMicroelectronics BZW50-82B
- Part No.:
- BZW50-82B
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- R-6, Axial
- Datasheet:
-
BZW50-82B.pdf
- Description:
- TVS DIODE 82VWM 189VC R6
- Quantity:
- Payment:
- Shipping:
Inventory:622
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Product details
Overview
BZW50-82B from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection in power rails and signal lines. It delivers 5000 W peak pulse power (10/1000 µs), clamps at 145 V (max) under 34 A surge, and operates up to 175 °C junction temperature - enabling robust protection in industrial SMPS, telecom interfaces, and automotive power modules.
For engineers reviewing the BZW50-82B datasheet, BZW50-82B pinout, BZW50-82B application, or BZW50-82B equivalent, key selection criteria include its 82 V stand-off voltage, bidirectional symmetry, low dynamic resistance (1.31 Ω), IEC 61000-4-2 ±30 kV ESD immunity, and R6 axial package compatibility with high-temperature PCB layouts.
Technical Context
The BZW50-82B uses planar silicon junction technology optimized for low leakage (<5 µA at 82 V) and stable clamping across -55 °C to +175 °C operating range. Its bidirectional structure provides symmetrical surge handling in both polarities without polarity dependency.
It meets IEC 61000-4-4 Level 4 (4 kV), exceeds IEC 61000-4-2 Level 4 (±30 kV air/contact discharge), and supports high-power transients up to 60 kW (8/20 µs) with thermal derating governed by junction temperature-dependent VCL and VBR coefficients (αT = 10.6 × 10−4/°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 82 V - maximum continuous reverse working voltage before clamping initiates |
| Breakdown Voltage (VBR) | 91 V min at 1 mA - precise threshold where avalanche conduction begins |
| Clamping Voltage (VCL) | 145 V max at 34 A (10/1000 µs) - limits downstream voltage stress during surge |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs) - defines energy-handling capability for standard lightning surges |
| Leakage Current (IRM) | <5 µA at 82 V - ensures minimal standby power loss in high-impedance circuits |
| Dynamic Resistance (RD) | 1.31 Ω - determines voltage rise per amp of surge current beyond rated IPP |
| Junction Temperature Range | −55 °C to +175 °C - enables deployment in under-hood automotive or industrial ambient environments |
Pinout & Package
Package: R6 axial leaded package (8.6–9.1 mm diameter × 25.4 mm length), matte tin-plated leads, ECOPACK® compliant, UL94 V0 rated epoxy body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Surge current entry (negative half-cycle) | Accepts transient energy during negative polarity events; symmetric with cathode in bidirectional operation |
| Cathode (Lead 2) | Surge current entry (positive half-cycle) | Accepts transient energy during positive polarity events; no polarity marking on bidirectional variant |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VCL, VBR, and IPP performance for both polarities - eliminates need for polarity-aware layout |
| High-temperature reliability | Rated for 175 °C Tj with <5 µA leakage at 82 V - maintains protection integrity in thermally stressed power systems |
| Low dynamic resistance | 1.31 Ω - minimizes voltage overshoot during fast-rising transients (e.g., EFT bursts) |
| IEC 61000-4-2 compliance | ±30 kV contact/air discharge immunity - exceeds Level 4 for direct ESD protection of exposed connectors |
| Planar junction construction | Enables tight parameter distribution and low capacitance (<100 pF at 1 MHz) - suitable for high-speed data line protection |
Applications
| Industrial SMPS Input Protection | Telecom Line Interface Protection |
|---|---|
Use Scenario: 48 V DC input rail in DIN-rail mounted AC/DC converters exposed to load dump and lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed across bulk capacitor input to limit transient voltage to ≤145 V. Use Value: Prevents MOSFET gate oxide breakdown and controller IC latch-up during 5000 W surge events while maintaining <5 µA standby leakage. |
Use Scenario: RS-485/RS-232 interface lines in outdoor base stations subjected to induced surges and ESD. IC Role / Device Role / Timing Role: Bidirectional TVS placed between differential pair and ground to shunt common-mode transients. Use Value: Symmetrical clamping preserves signal integrity without polarity biasing; 1.31 Ω RD ensures sub-10 ns response to 8/20 µs pulses. |
| Automotive Body Control Module (BCM) | Smart Meter Power Supply Protection |
Use Scenario: 12 V battery-supplied BCM power input facing ISO 7637-2 pulse 1, 2a, and 5a transients. IC Role / Device Role / Timing Role: Secondary surge suppressor downstream of fuse and primary filter, absorbing residual energy after LC filtering. Use Value: Withstands 175 °C ambient under hood; clamps 34 A surges to 145 V, protecting MCU and CAN transceivers. |
Use Scenario: M-Bus or PLC communication port in utility smart meters connected to mains-powered supply rails. IC Role / Device Role / Timing Role: Standoff-rated TVS across isolated DC-DC converter input to suppress coupling from meter's 230 V AC side. Use Value: 82 V VRM matches typical 72–90 V isolated bus; UL 497B listing validates safety compliance for field-deployed equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA (Littelfuse) | 85 V VRM, 150 V VCL @ 32.4 A, 6000 W PPP, DO-214AA package | Higher clamping voltage (+5 V), lower dynamic resistance (1.1 Ω), surface-mount only | Select when board space is constrained and SMT assembly is preferred; verify thermal pad design for 175 °C operation. |
| P6KE82CA (ON Semiconductor) | 82 V VRM, 132 V VCL @ 38 A, 6000 W PPP, DO-15 package | Lower clamping (−13 V), higher IPP, axial DO-15 (smaller diameter, shorter leads) | Choose for cost-sensitive designs where 132 V clamping margin suffices and mechanical fit allows smaller R6-equivalent footprint. |
Compared with SMBJ85CA and P6KE82CA, the BZW50-82B offers tighter VCL tolerance (145 V vs. 150 V/132 V), superior high-temperature leakage stability, and R6 package robustness for through-hole reliability - making it optimal for mission-critical industrial and automotive power rails.
Availability
BZW50-82B is available at Aetrix Electronics and suitable for industrial SMPS input protection, telecom line interface protection, and automotive body control module (BCM) power rails requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for BZW50-82B 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, power, and analog markets with emphasis on reliability and environmental compliance.
The BZW50 series belongs to ST's high-power TVS portfolio, engineered specifically for robust transient suppression in harsh-environment power conversion and interface circuits where thermal stability and repeatable clamping are critical.
FAQ
What is the maximum clamping voltage of BZW50-82B at 34 A?
The maximum clamping voltage (VCL) is 145 V under a 10/1000 µs surge waveform at 34 A, measured at Tamb = 25 °C. This value increases linearly with junction temperature using αT = 10.6 × 10−4/°C, reaching ~152 V at 125 °C junction temperature.
Is BZW50-82B suitable for IEC 61000-4-5 surge testing?
Yes - BZW50-82B is rated for 5000 W (10/1000 µs) and up to 60 kW (8/20 µs), directly aligning with IEC 61000-4-5 Combination Wave Generator (CWG) test levels. Its 145 V clamping at 34 A ensures downstream circuitry remains within safe operating voltage during 2 Ω source impedance surges.
How does the R6 package affect thermal performance?
The R6 axial package provides high thermal mass and low thermal resistance to ambient (Rth(j-a) ≈ 40 °C/W on 1 cm² copper), enabling sustained 6.5 W power dissipation on infinite heatsink. Its 25.4 mm length and 8.85 mm diameter optimize heat spreading in through-hole PCB layouts with minimal airflow.
Does BZW50-82B require polarity-specific PCB layout?
No - BZW50-82B is a bidirectional device with identical electrical characteristics in both directions. Its R6 package has no anode/cathode marking; PCB layout requires no orientation constraint, simplifying placement and reducing assembly errors in high-volume manufacturing.
BZW50-82B 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):
- 82V
- Voltage - Breakdown (Min):
- 91V
- Voltage - Clamping (Max) @ Ipp:
- 189V
- Current - Peak Pulse (10/1000µs):
- 317A (8/20µs)
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1300pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- R-6
BZW50-82B FAQ
1.How can I place an order for BZW50-82B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW50-82B 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 BZW50-82B reliable?
The price and inventory of BZW50-82B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW50-82B is usually 5 days.
3.What payment methods are accepted for BZW50-82B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW50-82B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW50-82B?
BZW50-82B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW50-82B 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 BZW50-82B?
For technical support, including BZW50-82B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW50-82B requirements.
6.How does Aetrix verify that BZW50-82B is sourced from the original manufacturer or authorized distributors?
All BZW50-82B 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 BZW50-82B meets industry standards.
7.What is the process for return or replacement of BZW50-82B?
All BZW50-82B units undergo pre-shipment inspection (PSI). If there is an issue with BZW50-82B, 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 BZW50-82B part is unused and in its original packaging.
Return procedure for BZW50-82B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW50-82B 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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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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