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STMicroelectronics BZW50-22B
- Part No.:
- BZW50-22B
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- R-6, Axial
- Datasheet:
-
BZW50-22B.pdf
- Description:
- TVS DIODE 22VWM 51VC R6
- Quantity:
- Payment:
- Shipping:
Inventory:730
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Product details
Overview
BZW50-22B from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection in power and signal lines. It features a 22 V stand-off voltage, 24.4 V minimum breakdown voltage at 1 mA, 39.4 V maximum clamping voltage at 127 A (10/1000 µs), 5000 W peak pulse power rating, and operates up to +175 °C junction temperature - deployed in industrial power supplies and telecom interface circuits.
For engineers reviewing the BZW50-22B datasheet, BZW50-22B pinout, BZW50-22B application, or BZW50-22B equivalent, key selection criteria include clamping voltage under 127 A surge, bidirectional polarity, R6 axial package compatibility, thermal derating above 25 °C, and IEC 61000-4-2/4-4 compliance for ESD and EFT immunity validation.
Technical Context
The BZW50-22B uses planar silicon junction technology optimized for low leakage (<5 µA at 22 V) and stable dynamic resistance (0.098 Ω at 10/1000 µs), enabling reliable clamping across wide temperature ranges (–55 °C to +175 °C). Its bidirectional structure provides symmetrical surge suppression without polarity dependency.
It delivers 5000 W peak pulse power at 25 °C, derating to ~3700 W at Tj = 175 °C per Figure 3, and supports fast transient events per IEC 61000-4-4 Level 4 (4 kV) and IEC 61000-4-2 (30 kV contact/air discharge), with junction capacitance <100 nF at 1 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 22 V - Maximum continuous reverse operating voltage before significant leakage begins. |
| Breakdown Voltage (VBR) | 24.4 V min at 1 mA - Confirmed avalanche initiation threshold ensuring predictable turn-on during transients. |
| Clamping Voltage (VCL) | 39.4 V max at 127 A (10/1000 µs) - Limits downstream voltage stress during 5 kW surges. |
| Peak Pulse Power (PPP) | 5000 W at 25 °C (10/1000 µs) - Sustains high-energy transients typical in AC mains and DC bus protection. |
| Junction Temperature Range | –55 °C to +175 °C - Enables deployment in under-hood automotive, industrial SMPS, and outdoor telecom equipment. |
| Leakage Current (IRM) | ≤5 µA at VRM - Minimizes standby power loss and avoids false triggering in high-impedance sensing paths. |
| Dynamic Resistance (RD) | 0.098 Ω - Ensures tight clamping voltage regulation across varying surge current magnitudes. |
Pinout & Package
The BZW50-22B is housed in an R6 axial leaded package (DO-201AD), with two terminals: anode and cathode marked by a cathode band on unidirectional variants; the BZW50-22B is bidirectional and lacks polarity marking - both leads are functionally identical for transient conduction in either direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Transient current entry (bidirectional) | Conducts surge energy toward ground or rail during positive or negative excursions - no fixed polarity. |
| Cathode (Lead 2) | Transient current exit (bidirectional) | Completes low-impedance path for surge return - symmetric with Lead 1 due to bidirectional construction. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD robustness | 30 kV air/contact discharge - eliminates need for external ESD filters in Ethernet, RS-485, and USB-C port protection. |
| High-temperature operation | Rated to +175 °C junction - supports placement near heat-generating components like MOSFETs or transformers without derating penalties. |
| Low dynamic resistance | 0.098 Ω - reduces VCL variation across 10–127 A surge range, improving system-level voltage margin predictability. |
| UL 497B certification | QVGQ2.E136224 - validates suitability for primary-side telecom surge protection per UL safety standards. |
| ECOPACK-compliant plating | Matte tin lead finish - ensures RoHS compliance and solderability stability over shelf life and reflow cycles. |
Applications
| Industrial Power Supply Protection | Telecom Line Interface |
|---|---|
|
Use Scenario: Protecting AC/DC converter inputs against lightning-induced surges on 230 VAC mains feeders. IC Role / Device Role / Timing Role: Primary-side TVS clamp placed between L/N and earth ground to shunt >5 kA transients within nanoseconds. Use Value: Clamps line-to-ground voltage to ≤39.4 V during 127 A 10/1000 µs surge, preventing rectifier bridge and controller IC damage. |
Use Scenario: Shielding RS-485 transceivers in outdoor base stations from induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional differential-line protector across A/B bus lines, referenced to local ground. Use Value: Symmetric clamping limits differential voltage swing to <80 V, preserving transceiver common-mode range and data integrity. |
| Automotive Body Control Module | Smart Meter Communication Port |
|
Use Scenario: Safeguarding LIN bus nodes connected to battery-supplied sensors in engine bay environments. IC Role / Device Role / Timing Role: Unidirectional (or bidirectional) TVS on LIN signal line to absorb load dump and ISO 7637-2 pulses. Use Value: Withstands 175 °C ambient and clamps 100 V transients to <40 V, ensuring microcontroller I/O survives harsh automotive transients. |
Use Scenario: Securing PLC or RF module interfaces in utility smart meters exposed to grid-switching transients. IC Role / Device Role / Timing Role: Secondary-side TVS on HPLC or NB-IoT antenna feedline to suppress coupling from nearby power electronics. Use Value: 30 kV ESD rating and <100 nF capacitance prevent signal distortion while meeting IEC 61000-4-5 Level 3 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22CA | Same 22 V VRM, but SMB package (smaller footprint); 600 W PPP vs. 5000 W - lower surge capacity. | Used where board space is constrained and surge threat level is ≤1 kA (e.g., consumer IoT sensor nodes). | Select when PCB real estate is critical and full 5 kW capability is unnecessary. |
| P6SMB22CA | Same R6 package and 5 kW rating, but higher VCL (43.5 V @ 115 A) and wider VBR tolerance (20.9–25.4 V). | Preferred in cost-sensitive industrial controls where tighter VCL is not required. | Choose if design tolerates higher clamping voltage and requires broader second-source availability. |
Compared with SMBJ22CA and P6SMB22CA, the BZW50-22B offers superior surge handling in the same R6 form factor, tighter VCL specification, and extended high-temperature reliability - making it optimal for mission-critical industrial and telecom infrastructure.
Availability
BZW50-22B is available at Aetrix Electronics and suitable for industrial power supply protection, telecom line interface hardening, automotive body control modules, and smart meter communication ports requiring stable component supply across multi-year production cycles.
Supply support for BZW50-22B 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 demanding power conversion and communications infrastructure applications.
FAQ
What is the maximum clamping voltage of BZW50-22B under a 10/1000 µs surge?
The maximum clamping voltage is 39.4 V at 127 A for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases with junction temperature per the αT coefficient (9.6 × 10−4/°C), reaching ~42.5 V at Tj = 125 °C using the formula VCL(Tj) = VCL(25 °C) × [1 + αT × (Tj − 25)].
Is BZW50-22B unidirectional or bidirectional?
BZW50-22B is a bidirectional TVS diode, indicated by the "B" suffix. It provides symmetrical clamping for both positive and negative transients without polarity constraints - unlike unidirectional variants (e.g., BZW50-22) which require correct anode/cathode orientation.
Can BZW50-22B be used in surface-mount designs?
No - BZW50-22B uses an axial R6 (DO-201AD) through-hole package with 25.4 mm lead spacing. It is not compatible with SMT assembly. For surface-mount equivalents, consider SMAJ22A (unidirectional) or SMBJ22CA (bidirectional), though both offer lower peak power (600 W).
Does BZW50-22B meet UL 497B for telecom surge protection?
Yes - BZW50-22B carries UL 497B file number QVGQ2.E136224, certifying its suitability for primary- and secondary-side surge protection in telecommunications equipment per UL 497B Annex D requirements, including impulse withstand and insulation coordination.
BZW50-22B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- R-6, Axial
- Series:
- BZW50, TRANSIL™
- Packaging:
- Cut Tape (CT)
- Product Status:
- Not For New Designs
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 51V
- Current - Peak Pulse (10/1000µs):
- 1177A (1.177kA) (8/20µs)
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 4250pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- R-6
BZW50-22B FAQ
1.How can I place an order for BZW50-22B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW50-22B 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 BZW50-22B reliable?
The price and inventory of BZW50-22B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW50-22B is usually 5 days.
3.What payment methods are accepted for BZW50-22B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW50-22B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW50-22B?
BZW50-22B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW50-22B 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 BZW50-22B?
For technical support, including BZW50-22B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW50-22B requirements.
6.How does Aetrix verify that BZW50-22B is sourced from the original manufacturer or authorized distributors?
All BZW50-22B 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 BZW50-22B meets industry standards.
7.What is the process for return or replacement of BZW50-22B?
All BZW50-22B units undergo pre-shipment inspection (PSI). If there is an issue with BZW50-22B, 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 BZW50-22B part is unused and in its original packaging.
Return procedure for BZW50-22B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW50-22B Tags
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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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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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