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STMicroelectronics BZW50-27B
- Part No.:
- BZW50-27B
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- R-6, Axial
- Datasheet:
-
BZW50-27B.pdf
- Description:
- TVS DIODE 27VWM 62VC R6
- Quantity:
- Payment:
- Shipping:
Inventory:4,574
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Product details
Overview
BZW50-27B from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection in power and signal lines. It features a 27 V stand-off voltage (VRM), 30 V minimum breakdown voltage (VBR), 48.3 V maximum clamping voltage (VCL) at 103 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 BZW50-27B datasheet, BZW50-27B pinout, BZW50-27B application, or BZW50-27B equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD tolerance, bidirectional polarity handling for AC-coupled lines, thermal derating above 25 °C, and compliance with IEC 61000-4-2 level 4 (±30 kV contact/air) and IEC 61000-4-4 level 4 (4 kV).
Technical Context
The BZW50-27B uses planar silicon junction technology optimized for low leakage (<5 µA at VRM) and stable dynamic resistance (0.147 Ω at 10/1000 µs), enabling reliable clamping under repeated surges. Its bidirectional structure provides symmetrical protection for AC signals or differential buses without polarity constraints.
Thermal performance is defined by a junction-to-ambient thermal resistance of ~40 °C/W on FR4 PCB with 1 cm² copper per lead, and peak power capability drops to 3700 W at Tj = 175 °C - critical for high-temperature industrial environments where sustained surge duty cycles occur.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 27 V - maximum continuous reverse operating voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 30 V min at 1 mA - guaranteed conduction onset under ESD/transient stress |
| Clamping Voltage (VCL) | 48.3 V max at 103 A (10/1000 µs) - limits voltage seen by downstream circuitry during surge |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs) - energy-handling capacity for standard lightning/surge waveforms |
| Junction Temperature Range | –55 °C to +175 °C - supports operation in harsh environments including motor drives and outdoor telecom |
| Leakage Current (IRM) | ≤5 µA at VRM - ensures minimal standby power loss and signal integrity in high-impedance nodes |
| Dynamic Resistance (RD) | 0.147 Ω - determines voltage rise slope under high di/dt transients; lower value improves clamping fidelity |
Pinout & Package
The BZW50-27B is housed in the R6 axial-leaded package (DO-201AD), featuring two terminals: anode and cathode marked by a cathode band on unidirectional variants; bidirectional versions like BZW50-27B have no polarity marking and are symmetrically constructed.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during positive surge | Connects to line being protected; forms one side of bidirectional clamping path |
| Cathode | Current entry terminal during negative surge | Connects to line being protected; completes symmetrical clamping path for AC or differential signals |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Enables single-device protection of AC lines, RS-485, CAN, or Ethernet PHY interfaces without polarity concerns |
| High-temperature reliability | Rated for continuous operation up to +175 °C junction temperature - suitable for enclosed power converters and automotive under-hood locations |
| Low dynamic resistance | 0.147 Ω reduces voltage overshoot during fast-rising transients (e.g., EFT bursts), improving system immunity margin |
| IEC 61000-4-2 level 4 compliance | Withstands ±30 kV contact and air discharge - exceeds industrial immunity requirements for front-panel interfaces and field wiring |
| Planar junction construction | Delivers stable leakage current (<5 µA) and predictable VBR drift over temperature - critical for precision analog input protection |
Applications
| Industrial Power Supply Input Protection | Telecom Line Interface Protection |
|---|---|
Use Scenario: Protecting AC/DC converter inputs against lightning-induced surges on 24 V DC distribution rails in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to clamp common-mode transients before they reach rectifier and controller ICs. Use Value: Limits voltage to ≤48.3 V during 103 A surge, preventing damage to 36 V-rated MOSFETs and PWM controllers while maintaining >1000-cycle lifetime at full rating. | Use Scenario: Safeguarding RS-485 transceivers connected to long outdoor cable runs exposed to induced surges. IC Role / Device Role / Timing Role: Placed differentially across A/B bus lines to suppress both polarities of fast transients without disrupting DC bias or signal integrity. Use Value: Clamps ±48.3 V within 1 ns response time, preserving data integrity up to 10 Mbps and meeting EN 61000-4-4 level 4 immunity requirements. |
| Automotive Body Control Module (BCM) Inputs | Smart Meter Communication Port Protection |
Use Scenario: Protecting LIN bus and sensor inputs in BCMs subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Mounted at connector entry point to absorb coupled energy before it reaches microcontroller GPIOs and level shifters. Use Value: Handles 5000 W peak power at ambient temperatures up to +105 °C, with derated clamping performance verified to 175 °C junction limit. | Use Scenario: Shielding PLC or RF communication ports in utility smart meters from ESD events during field servicing. IC Role / Device Role / Timing Role: Used as primary protection on meter's HPLC or NB-IoT antenna feedline to prevent latch-up in RF front-end ICs. Use Value: Withstands ±30 kV contact discharge (IEC 61000-4-2 level 4) with <5 µA leakage at 27 V - avoids false resets or calibration drift in metrology circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ27CA | Same 27 V VRM and bidirectional configuration, but SMB package (smaller footprint); 600 W PPP rating (vs. 5000 W) | Limited to lower-energy surges (e.g., board-level ESD only); unsuitable for mains-connected or long-cable interfaces | Select when space-constrained PCB layout prioritizes size over surge robustness |
| P6SMB27CA | Same SMB package and 600 W rating; slightly higher VCL (49.1 V) and leakage (10 µA) | Marginally reduced clamping performance and higher standby current - may affect ultra-low-power metering accuracy | Prefer only if legacy design reuse or distributor stock availability dictates substitution |
Compared with SMBJ27CA and P6SMB27CA, the BZW50-27B delivers 8.3× higher peak power handling and superior thermal stability at elevated temperatures - making it the only choice for industrial-grade surge immunity where 5 kW pulse energy must be safely dissipated without degradation.
Availability
BZW50-27B is available at Aetrix Electronics and suitable for industrial power supplies, telecom interface modules, automotive body control units, and smart meter communication ports requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for BZW50-27B 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 portfolio, engineered specifically for robust front-end surge protection in equipment exposed to lightning, EFT, and ISO 7637-2 transients - targeting applications demanding >5 kW pulse handling and extended temperature reliability.
FAQ
What is the difference between BZW50-27 and BZW50-27B?
The "B" suffix denotes bidirectional configuration: BZW50-27B provides symmetrical clamping for both positive and negative transients, while BZW50-27 is unidirectional and requires correct polarity orientation. Both share identical VRM (27 V), VBR (30 V min), and PPP (5000 W), but only the "B" version is suitable for AC-coupled or differential signal lines without external polarity management.
Can BZW50-27B be used in parallel to increase surge current handling?
No - paralleling TVS diodes is not recommended due to mismatched dynamic resistance and VBR tolerances, which cause uneven current sharing and potential thermal runaway. For higher current capability, select a single higher-rated device such as BZW50-33B (59 V VCL at 85 A) or consult ST's application note AN4272 for staged protection architectures.
Does BZW50-27B meet UL 497B certification?
Yes - BZW50-27B carries UL 497B file number QVGQ2.E136224, certifying its suitability for use in secondary circuit protection of telecommunications equipment, including surge protective devices (SPDs) and interface circuits compliant with UL 497B Annex D requirements.
How does junction temperature affect clamping voltage performance?
VCL increases linearly with junction temperature at 9.8 × 10⁻⁴ V/°C (αT = 9.8 × 10⁻⁴ /°C). At 175 °C, VCL rises by ~1.47 V above its 25 °C value (48.3 V), reaching ~49.8 V - still within safe margins for 36 V-rated downstream components, provided thermal design maintains Tj ≤ 175 °C under worst-case surge repetition.
BZW50-27B 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):
- 27V
- Voltage - Breakdown (Min):
- 30V
- Voltage - Clamping (Max) @ Ipp:
- 62V
- Current - Peak Pulse (10/1000µs):
- 968A (8/20µs)
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 3500pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- R-6
BZW50-27B FAQ
1.How can I place an order for BZW50-27B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW50-27B 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 BZW50-27B reliable?
The price and inventory of BZW50-27B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW50-27B is usually 5 days.
3.What payment methods are accepted for BZW50-27B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW50-27B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW50-27B?
BZW50-27B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW50-27B 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 BZW50-27B?
For technical support, including BZW50-27B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW50-27B requirements.
6.How does Aetrix verify that BZW50-27B is sourced from the original manufacturer or authorized distributors?
All BZW50-27B 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 BZW50-27B meets industry standards.
7.What is the process for return or replacement of BZW50-27B?
All BZW50-27B units undergo pre-shipment inspection (PSI). If there is an issue with BZW50-27B, 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 BZW50-27B part is unused and in its original packaging.
Return procedure for BZW50-27B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW50-27B 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
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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