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STMicroelectronics BZW50-33BRL
- Part No.:
- BZW50-33BRL
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- R-6, Axial
- Datasheet:
-
BZW50-33BRL.pdf
- Description:
- TVS DIODE 33VWM 76VC R6
- Quantity:
- Payment:
- Shipping:
Inventory:1,973
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Product details
Overview
BZW50-33BRL 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 59 V (max) under 85 A surge, and operates up to 175 °C junction temperature-enabling robust protection in industrial motor drives, telecom power supplies, and automotive body control modules.
For engineers reviewing the BZW50-33BRL datasheet, BZW50-33BRL pinout, BZW50-33BRL application, or BZW50-33BRL equivalent, key selection criteria include its bidirectional R6 package configuration, 33 V stand-off voltage, 36.6 V minimum breakdown, low dynamic resistance (0.218 Ω), and IEC 61000-4-2 ±30 kV ESD compliance-critical for high-reliability DC bus and interface line protection.
Technical Context
The BZW50-33BRL uses planar silicon avalanche technology to achieve precise voltage clamping with low leakage (<5 µA at 33 V) and stable thermal performance up to 175 °C. Its bidirectional symmetry enables symmetric surge handling across both polarities without polarity-dependent design constraints.
It meets IEC 61000-4-4 Level 4 (4 kV) and exceeds IEC 61000-4-2 Level 4 for both air and contact discharge (±30 kV), supported by a dynamic resistance of 0.218 Ω and clamping voltage of 59 V at 85 A (10/1000 µs), ensuring predictable voltage limiting during fast transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 33 V - Maximum continuous reverse operating voltage before significant leakage begins. |
| Breakdown Voltage (VBR) | 36.6 V min - Voltage at which device enters avalanche conduction; defines turn-on threshold. |
| Clamping Voltage (VCL) | 59 V max @ 85 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge. |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs) - Sustained surge energy absorption capability at room temperature. |
| Junction Temperature Range | –55 °C to +175 °C - Enables operation in under-hood automotive or high-ambient industrial environments. |
| Leakage Current (IRM) | ≤5 µA @ VRM - Ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| Dynamic Resistance (RD) | 0.218 Ω - Determines voltage rise per ampere of surge current; critical for precision clamping. |
Pinout & Package
The BZW50-33BRL is housed in the axial-leaded R6 package (DO-201AD), with two terminals: Cathode and Anode. As a bidirectional device, it has no polarity marking; both terminals are functionally symmetric for AC or dual-polarity DC protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode (bidirectional reference) | One side of symmetrical avalanche junction; connects to line or rail requiring bidirectional clamping. |
| Terminal 2 | Cathode (bidirectional reference) | Other side of symmetrical avalanche junction; completes low-inductance path to ground or return rail. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | ±30 kV contact/air discharge - Eliminates need for external ESD filters in front-end interfaces. |
| High-temperature reliability | Rated for 175 °C junction operation - Supports placement near heat sources without derating. |
| Low dynamic resistance | 0.218 Ω - Minimizes clamping voltage overshoot during fast-rising surges (e.g., lightning-induced). |
| UL 497B certification | QVGQ2.E136224 - Validates suitability for telecom and industrial secondary-circuit surge protection. |
| ECOPACK® compliant | Meets RoHS and halogen-free requirements - Ensures compliance in global environmental regulations. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of 48 V DC bus against load dump and inductive switching transients in servo drive controllers. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across input bulk capacitor to limit surge voltage to <60 V. Use Value: Prevents MOSFET gate oxide failure and controller IC latch-up during 5000 W surges at 10/1000 µs. |
Use Scenario: Input-stage surge suppression on -48 V telecom rectifier outputs feeding backplane distribution. IC Role / Device Role / Timing Role: Primary-level TVS connected between output rail and chassis ground to absorb IEC 61000-4-4 Level 4 events. Use Value: Maintains system uptime by clamping transients below 59 V while surviving repeated 85 A surges. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: CAN bus power rail protection in BCMs exposed to ISO 7637-2 pulse 5a (load dump). IC Role / Device Role / Timing Role: Bidirectional clamp on 12 V supply line upstream of LDO regulators and microcontrollers. Use Value: Withstands 175 °C ambient and suppresses >300 V transients to safe levels within 1 ns response time. |
Use Scenario: Surge protection on AC/DC converter input stage in DIN-rail mounted meters subjected to utility grid transients. IC Role / Device Role / Timing Role: Secondary-side TVS on DC link after bridge rectifier to protect metering ICs and RTC backup circuits. Use Value: Delivers 5000 W pulse handling with <5 µA leakage-preserving battery life in always-on meter designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | Same 33 V VRM, but SMB package (smaller footprint); lower PPP = 600 W (10/1000 µs) | Limited to low-energy consumer electronics; insufficient for industrial 5 kW surges | Select only when space-constrained and surge energy ≤600 W |
| 1.5KE33CA | Same DO-201AD (R6) package; higher VCL = 53.3 V @ 92.7 A; lower RD = 0.17 Ω | Higher leakage (50 µA) and lower Tj max (150 °C) reduce reliability in hot environments | Prefer where lower clamping voltage is prioritized over thermal margin |
Compared with SMBJ33CA and 1.5KE33CA, BZW50-33BRL uniquely combines R6 package ruggedness, 5000 W surge rating, 175 °C operation, and sub-5 µA leakage-making it the only choice for high-power, high-temperature, low-leakage DC bus protection.
Availability
BZW50-33BRL is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and smart energy meters requiring stable component supply across long production lifecycles.
Supply support for BZW50-33BRL 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
The BZW50 series belongs to ST's high-power TVS portfolio, engineered specifically for robust, high-temperature surge protection in mission-critical power conversion and interface circuits where reliability under extreme electrical stress is non-negotiable.
FAQ
What is the maximum clamping voltage of BZW50-33BRL at 85 A?
The maximum clamping voltage (VCL) is 59 V under a 10/1000 µs surge waveform at 85 A, measured at 25 °C ambient. This value increases linearly with junction temperature at a coefficient of 10 × 10⁻⁴ /°C, reaching ~64.5 V at 175 °C junction temperature.
Is BZW50-33BRL unidirectional or bidirectional?
BZW50-33BRL is a bidirectional TVS diode, indicated by the "B" suffix in the part number. It provides symmetrical clamping for both positive and negative transients without polarity sensitivity-ideal for AC lines or dual-rail DC systems.
Does BZW50-33BRL meet UL 497B requirements?
Yes-BZW50-33BRL is certified under UL 497B with file number QVGQ2.E136224, confirming its suitability for use in telecommunications primary and secondary circuits as defined in UL Standard 497B for surge protective devices.
What is the lead finish and soldering profile for BZW50-33BRL?
The device features matte tin-plated leads compatible with standard SnPb and lead-free reflow processes. ST recommends a peak reflow temperature of 240–245 °C for 60 seconds max, with ramp rates ≤3 °C/s, per IPC/JEDEC J-STD-020 Class 3 guidelines.
BZW50-33BRL 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.6V
- Voltage - Clamping (Max) @ Ipp:
- 76V
- Current - Peak Pulse (10/1000µs):
- 789A (8/20µs)
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 2875pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- R-6
BZW50-33BRL FAQ
1.How can I place an order for BZW50-33BRL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW50-33BRL 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 BZW50-33BRL reliable?
The price and inventory of BZW50-33BRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW50-33BRL is usually 5 days.
3.What payment methods are accepted for BZW50-33BRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW50-33BRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW50-33BRL?
BZW50-33BRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW50-33BRL 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 BZW50-33BRL?
For technical support, including BZW50-33BRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW50-33BRL requirements.
6.How does Aetrix verify that BZW50-33BRL is sourced from the original manufacturer or authorized distributors?
All BZW50-33BRL 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 BZW50-33BRL meets industry standards.
7.What is the process for return or replacement of BZW50-33BRL?
All BZW50-33BRL units undergo pre-shipment inspection (PSI). If there is an issue with BZW50-33BRL, 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 BZW50-33BRL part is unused and in its original packaging.
Return procedure for BZW50-33BRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW50-33BRL Tags
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ESD9B5.0ST5G
onsemi
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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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onsemi
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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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