My Inquiry
My Account
STMicroelectronics BZW50-27RL
- Part No.:
- BZW50-27RL
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- R-6, Axial
- Datasheet:
-
BZW50-27RL.pdf
- Description:
- TVS DIODE 27VWM 62VC R6
- Quantity:
- Payment:
- Shipping:
Inventory:948
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZW50-27RL from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. 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, and operates up to +175 °C junction temperature - deployed in industrial power supplies, telecom line cards, and automotive body control modules.
For engineers reviewing the BZW50-27RL datasheet, BZW50-27RL pinout, BZW50-27RL application, or BZW50-27RL equivalent, key selection criteria include clamping performance under 10/1000 µs surges, thermal derating above 25 °C, bidirectional variant compatibility (BZW50-27BRL), and R6 package mounting constraints for high-reliability PCB layouts.
Technical Context
This planar-junction TVS diode uses silicon avalanche technology to clamp transient overvoltages before sensitive downstream circuitry is damaged. Its low dynamic resistance (0.147 Ω) ensures minimal voltage overshoot during fast 8/20 µs surges, while the 10/1000 µs rating supports IEC 61000-4-5 Level 4 compliance for AC/DC input stages.
The device exhibits a positive voltage temperature coefficient (αT = 9.8 × 10⁻⁴ /°C), enabling predictable VBR and VCL drift with junction temperature rise - critical for thermal design in enclosed power converters operating near 175 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 27 V - Maximum continuous reverse working voltage before leakage exceeds 1 µA; defines safe operating margin below breakdown. |
| Breakdown Voltage (VBR) | 30 V min @ 1 mA - Voltage at which avalanche conduction initiates; ensures reliable triggering before system damage threshold. |
| Clamping Voltage (VCL) | 48.3 V max @ 103 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; determines IC survival margin. |
| Peak Pulse Power (PPP) | 5000 W @ 10/1000 µs - Energy-handling capability for lightning-induced surges; derates to 3700 W at Tj = 175 °C. |
| Leakage Current (IRM) | 5 µA max @ VRM - Low standby loss critical for battery-backed or low-power sensor nodes where quiescent current affects runtime. |
| Junction Temperature Range | −55 °C to +175 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom enclosures without derating. |
Pinout & Package
R6 axial-leaded package: 9.1 mm max length, 8.85 mm nominal diameter, matte tin-plated leads, 260 °C soldering tolerance (10 s at 5 mm from case). Compliant with J-STD-002 E3 and MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to protected line; conducts surge current toward ground when reverse-biased beyond VBR. |
| Cathode | Reverse-biased terminal (marked with bar) | Connected to ground reference; establishes polarity-sensitive clamping action for DC bus protection. |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature operation | Rated to +175 °C junction temperature - eliminates need for external heatsinking in compact industrial SMPS designs. |
| Low dynamic resistance | 0.147 Ω - minimizes VCL rise under high-current transients, preserving voltage margin for 3.3 V or 5 V logic rails. |
| IEC 61000-4-2 ESD robustness | 30 kV contact/air discharge - exceeds Level 4, enabling direct interface with exposed connectors in medical or test equipment. |
| UL 497B certification | QVGQ2.E136224 listing - validates suitability for primary-side telecom surge protection per UL 497B requirements. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24 V DC input stage of DIN-rail mounted PLC power supply subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping element on main DC rail; absorbs 100–200 A transients within microseconds. Use Value: Clamps to ≤48.3 V during 103 A surge, preventing MOSFET gate oxide failure and maintaining regulation in buck controller ICs. |
Use Scenario: LIN bus transceiver power line in door module exposed to ESD events during assembly and field service. IC Role / Device Role / Timing Role: Standoff protector on VCC rail; suppresses ±30 kV ESD per IEC 61000-4-2 without latch-up. Use Value: 5 µA leakage at 27 V preserves sleep-mode current budget; 175 °C rating supports under-dash placement near HVAC ducts. |
| Telecom Line Card Surge Protection | Renewable Energy Inverter DC Link |
Use Scenario: -48 V DC feed line in central office line card facing induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Secondary-level protector downstream of gas discharge tube (GDT); handles residual energy after GDT crowbar. Use Value: 5000 W 10/1000 µs rating coordinates with upstream GDT to meet ITU-T K.20 Level 4 immunity requirements. |
Use Scenario: DC link between PV array and MPPT converter in solar microinverter, subject to switching transients and grid faults. IC Role / Device Role / Timing Role: Overvoltage clamp across bulk capacitor; limits voltage spikes during IGBT turn-off. Use Value: 0.147 Ω dynamic resistance ensures <1 V overshoot at 100 A, protecting 600 V-rated electrolytic capacitors from overvoltage stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ27A | DO-214AA package; 400 W rated power; 45.7 V clamping @ 7.5 A (10/1000 µs) | Lower energy handling; suited for signal-line or low-power DC rails only | Select when board space is constrained and surge threat is limited to IEC 61000-4-2 ESD, not lightning. |
| P6KE27A | DO-15 package; 600 W rated power; 43.5 V clamping @ 13.7 A (10/1000 µs); 175 °C rated | Lower peak power and higher VCL than BZW50-27RL; no UL 497B listing | Choose for cost-sensitive industrial controls where UL certification is not mandated and 5 kW capability is unnecessary. |
Compared with SMBJ27A and P6KE27A, BZW50-27RL delivers 8.3× and 8.3× higher peak pulse power respectively, lower dynamic resistance for tighter clamping, and UL 497B certification - making it the sole choice for primary-side telecom and automotive DC bus protection requiring IEC 61000-4-5 Level 4 compliance.
Availability
BZW50-27RL is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom line cards, and renewable energy inverters requiring stable component supply across multi-year production cycles.
Supply support for BZW50-27RL 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 front-end surge protection in harsh-environment power systems where reliability at elevated temperatures and certified compliance are mandatory.
FAQ
What is the maximum clamping voltage of BZW50-27RL under a 10/1000 µs surge?
The maximum clamping voltage is 48.3 V at 103 A for a 10/1000 µs waveform, measured at Tj = 25 °C. This value increases with junction temperature at a rate defined by αT = 9.8 × 10−4 /°C, so at 125 °C, VCL rises to approximately 51.2 V.
Is BZW50-27RL RoHS-compliant and halogen-free?
Yes - BZW50-27RL is manufactured in ST's ECOPACK2-compliant R6 package, meeting RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. The matte tin lead finish complies with JESD 22-B102 E3 and MIL-STD-750 Method 2026.
Can BZW50-27RL be used in bidirectional configurations?
No - BZW50-27RL is unidirectional. For bidirectional protection at 27 V standoff, use BZW50-27BRL, which provides symmetrical clamping in both polarities and identical 48.3 V VCL rating for ±103 A surges.
What is the thermal resistance junction-to-ambient for BZW50-27RL on a standard FR4 PCB?
On a 70 µm copper FR4 board with 2 cm² copper area per lead, Rth(j-a) is approximately 40 °C/W for single-pulse conditions. With 5 cm² copper per lead, it improves to ~25 °C/W - critical for sustaining 3700 W surge capability at Tj = 175 °C.
BZW50-27RL 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):
- 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:
- 7000pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- R-6
BZW50-27RL FAQ
1.How can I place an order for BZW50-27RL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW50-27RL 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 BZW50-27RL reliable?
The price and inventory of BZW50-27RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW50-27RL is usually 5 days.
3.What payment methods are accepted for BZW50-27RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW50-27RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW50-27RL?
BZW50-27RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW50-27RL 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 BZW50-27RL?
For technical support, including BZW50-27RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW50-27RL requirements.
6.How does Aetrix verify that BZW50-27RL is sourced from the original manufacturer or authorized distributors?
All BZW50-27RL 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 BZW50-27RL meets industry standards.
7.What is the process for return or replacement of BZW50-27RL?
All BZW50-27RL units undergo pre-shipment inspection (PSI). If there is an issue with BZW50-27RL, 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 BZW50-27RL part is unused and in its original packaging.
Return procedure for BZW50-27RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW50-27RL Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
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
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
