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STMicroelectronics BZW50-82RL
- Part No.:
- BZW50-82RL
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- R-6, Axial
- Datasheet:
-
BZW50-82RL.pdf
- Description:
- TVS DIODE 82VWM 189VC R6
- Quantity:
- Payment:
- Shipping:
Inventory:816
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Product details
Overview
BZW50-82RL from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in R6 package, designed for high-energy surge protection in power rails and signal lines. It features 82 V stand-off voltage (VRM), 91 V minimum breakdown voltage (VBR), 145 V maximum clamping voltage (VCL) at 34 A (10/1000 µs), and 5000 W peak pulse power rating. It operates up to +175 °C junction temperature and is used in industrial power supplies and telecom interfaces requiring IEC 61000-4-2/4-4 compliance.
For engineers reviewing the BZW50-82RL datasheet, BZW50-82RL pinout, BZW50-82RL application, or BZW50-82RL equivalent, key selection criteria include clamping voltage margin vs. protected IC VMAX, leakage current at operating temperature, dynamic resistance under surge, thermal derating above 25 °C, and R6 package soldering profile compatibility with FR4 PCB layouts.
Technical Context
This planar-junction TVS diode uses silicon avalanche technology to clamp fast transients while maintaining low leakage (<5 µA at VRM) and stable VBR over temperature (αT = 10.6 × 10−4/°C). Its R6 axial package enables high thermal mass and direct heatsink mounting for sustained 3700 W dissipation at Tj = 175 °C.
The device supports both unidirectional and bidirectional variants (BZW50-82 vs. BZW50-82B); BZW50-82RL is unidirectional with cathode-bar marking. Electrical behavior is defined by standardized 10/1000 µs and 8/20 µs pulse waveforms per IEC 61000-4-5, with VCL calculated using RD = 1.31 Ω and temperature coefficient correction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 82 V - Maximum continuous reverse working voltage before clamping begins; sets upper limit of protected circuit's normal operating range. |
| Breakdown Voltage (VBR) | 91 V min at 1 mA - Voltage at which avalanche conduction initiates; defines turn-on threshold with ±5% tolerance across temperature. |
| Clamping Voltage (VCL) | 145 V max at 34 A (10/1000 µs) - Peak voltage seen by downstream circuit during worst-case surge; determines required IC overvoltage margin. |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs) - Energy-handling capability under standard lightning surge waveform; derates to 3700 W at Tj = 175 °C. |
| Leakage Current (IRM) | ≤5 µA at VRM and 25 °C - Low reverse leakage ensures minimal power loss and signal integrity in high-impedance bias networks. |
| Dynamic Resistance (RD) | 1.31 Ω - Slope of V-I curve in clamping region; directly impacts VCL rise under higher IPP and affects system-level overshoot control. |
| Junction Temperature Range | −55 °C to +175 °C - Enables deployment in harsh environments including industrial motor drives and outdoor telecom equipment. |
Pinout & Package
The BZW50-82RL is housed in an R6 axial-leaded package (JEDEC DO-201AD equivalent), with matte tin-plated leads compliant to J-STD-002 and MIL-STD-750. Cathode is marked by a bar on the body; lead spacing is 25.4 mm (1.000 inch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point during forward conduction; connected to ground or low-side rail in unidirectional protection. | Provides low-VF path for ESD discharge to reference plane; must be routed with minimal inductance to avoid voltage overshoot. |
| Cathode (bar-marked end) | Current exit point during reverse avalanche clamping; connected to protected line (e.g., DC input, RS-485 bus). | Defines clamping polarity; reverse-biased operation ensures no conduction during normal operation, preserving signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | 30 kV air/contact discharge - exceeds Level 4, enabling single-device protection for front-end ports without external RC filtering. |
| High-temperature reliability | Rated for continuous operation up to Tj = 175 °C - maintains clamping performance in enclosed power converters and automotive under-hood applications. |
| Low dynamic resistance | RD = 1.31 Ω - minimizes VCL increase under high-current surges, reducing stress on downstream MOSFETs or bridge rectifiers. |
| UL 497B certification | File QVGQ2.E136224 - validates suitability for primary-side telecom and industrial interface protection per safety standards. |
| ECOPACK-compliant packaging | R6 package with matte tin plating - meets RoHS, REACH, and whisker resistance (JESD201 Class 2), supporting long-term field reliability. |
Applications
| Industrial AC/DC Power Supply Input | Telecom Line Interface Protection |
|---|---|
|
Use Scenario: Protects bulk capacitor and rectifier bridge against lightning-induced surges on 100–240 VAC mains input. IC Role / Device Role: Primary surge clamp placed between L/N and earth ground, upstream of EMI filter. Use Value: Clamps 5 kV/10/1000 µs surges to ≤145 V, preventing rectifier avalanche failure and capacitor overvoltage rupture. |
Use Scenario: Shields RS-485 transceivers and isolation transformers from induced surges on outdoor data lines. IC Role / Device Role: Unidirectional TVS on each differential line (A/B) referenced to signal ground. Use Value: Limits transient voltage to <150 V while maintaining <5 µA leakage, avoiding false triggering of receiver thresholds. |
| Motor Drive DC Bus Protection | Automotive Body Control Module (BCM) Power Rail |
|
Use Scenario: Safeguards IGBT gate drivers and MCU supply rails against inductive kickback from brushed DC motors. IC Role / Device Role: Clamp across +24 V DC bus and chassis ground, absorbing repetitive 1–3 kA spikes. Use Value: Sustains 3700 W clamping at 175 °C junction, enabling compact heatsink design without derating penalties. |
Use Scenario: Guards 12 V battery-supplied microcontrollers and CAN transceivers against load dump and jump-start transients. IC Role / Device Role: Unidirectional TVS on main VBAT input, coordinated with polyfuse and LC filter. Use Value: Withstands 30 kV ESD per IEC 61000-4-2 and clamps 12 V load dump to <145 V, meeting ISO 7637-2 Pulse 5a requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85A | DO-214AA package; 85 V VRM; 144 V VCL @ 34.4 A; lower PPP (600 W) but faster response time. | Surface-mount only; unsuitable for high-power through-hole designs requiring >3 kW surge handling. | Select when board space is constrained and surge energy is limited to <1 kJ; verify thermal pad layout for SMB footprint. |
| P6KE82A | DO-15 package; 82 V VRM; 137 V VCL @ 36.5 A; 600 W PPP; higher IRM (10 µA) and lower Tjmax (150 °C). | Limited to lower ambient temperatures and single-event surges; not rated for repeated 175 °C operation. | Choose for cost-sensitive consumer applications where full 5 kW rating and extended temperature range are unnecessary. |
Compared with SMBJ85A and P6KE82A, BZW50-82RL delivers 8.3× higher peak power, 175 °C junction rating for sustained operation, and R6 mechanical robustness-making it uniquely suited for industrial-grade power rail protection where thermal and energy margins are critical.
Availability
BZW50-82RL is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, telecom line interfaces, motor drive DC buses, and automotive BCM power rails requiring stable component supply across multi-year production cycles.
Supply support for BZW50-82RL 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 industrial, automotive, and consumer markets.
The BZW50 series belongs to ST's high-power TVS diode product line, engineered specifically for robust, high-energy transient suppression in demanding power conversion and communication infrastructure applications.
FAQ
What is the maximum clamping voltage of BZW50-82RL under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 145 V at 34 A for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases linearly with junction temperature using αT = 10.6 × 10−4/°C, reaching ~158 V at Tj = 175 °C per datasheet Equation 2.
Can BZW50-82RL be used in bidirectional signal line protection?
No - BZW50-82RL is unidirectional and conducts only in reverse avalanche mode. For bidirectional protection (e.g., RS-485, USB), use the BZW50-82B variant, which has symmetrical clamping in both polarities and identical VRM/VCL ratings.
What is the recommended PCB layout for optimal thermal performance?
Mount BZW50-82RL with ≥1 cm² copper area per lead on 70 µm FR4, using thermal vias to inner ground planes. Per Figure 12, Rth(j-a) drops from 4.5 °C/W to <2.5 °C/W with 3 cm² total copper, enabling full 5000 W rating at Tamb ≤ 70 °C.
Does BZW50-82RL meet UL 497B for telecom surge protection?
Yes - it carries UL 497B file number QVGQ2.E136224, certifying compliance for primary circuit protection in telecommunications equipment, including Type 1 and Type 2 SPD applications per ANSI/UL 497B Edition 5.
BZW50-82RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- R-6, Axial
- Series:
- BZW50, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- 2600pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- R-6
BZW50-82RL FAQ
1.How can I place an order for BZW50-82RL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW50-82RL 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 BZW50-82RL reliable?
The price and inventory of BZW50-82RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW50-82RL is usually 5 days.
3.What payment methods are accepted for BZW50-82RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW50-82RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW50-82RL?
BZW50-82RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW50-82RL 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 BZW50-82RL?
For technical support, including BZW50-82RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW50-82RL requirements.
6.How does Aetrix verify that BZW50-82RL is sourced from the original manufacturer or authorized distributors?
All BZW50-82RL 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 BZW50-82RL meets industry standards.
7.What is the process for return or replacement of BZW50-82RL?
All BZW50-82RL units undergo pre-shipment inspection (PSI). If there is an issue with BZW50-82RL, 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 BZW50-82RL part is unused and in its original packaging.
Return procedure for BZW50-82RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW50-82RL Tags
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