My Inquiry
My Account
STMicroelectronics BZW50-22
- Part No.:
- BZW50-22
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- R-6, Axial
- Datasheet:
-
BZW50-22.pdf
- Description:
- TVS DIODE 22VWM 51VC R6
- Quantity:
- Payment:
- Shipping:
Inventory:196
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZW50-22 from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It delivers 5000 W peak pulse power (10/1000 µs), clamps at 39.4 V (max) under 127 A surge, 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 BZW50-22 datasheet, BZW50-22 pinout, BZW50-22 application, or BZW50-22 equivalent, key selection criteria include clamping voltage vs. surge current, temperature coefficient of breakdown voltage (9.6 × 10⁻⁴ /°C), dynamic resistance (0.098 Ω), bidirectional variant availability (BZW50-22B), and R6 package thermal performance on FR4 PCBs.
Technical Context
The BZW50-22 uses planar silicon junction technology optimized for low leakage (<5 µA at 22 V) and stable clamping across –55 °C to +175 °C operating range. Its unidirectional polarity enables precise anode-cathode placement in DC rail protection paths with defined forward conduction behavior.
It meets IEC 61000-4-2 level 4 (±30 kV contact/air discharge) and IEC 61000-4-4 level 4 (4 kV), with clamping voltage defined at 10/1000 µs and 8/20 µs waveforms. Dynamic resistance (0.098 Ω) and voltage temperature coefficient (9.6 × 10⁻⁴ /°C) are specified per DS0662 Rev 8, enabling accurate overvoltage margining in thermally demanding environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 22 V - maximum continuous reverse working voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 24.4 V (min) at 1 mA - onset of avalanche conduction under controlled DC test condition |
| Clamping Voltage (VCL) | 39.4 V (max) at 127 A, 10/1000 µs - peak voltage seen by protected circuit during worst-case surge |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs) - energy-handling capacity defining protection robustness for standard lightning surges |
| Leakage Current (IRM) | ≤5 µA at VRM - ensures minimal standby power loss and signal integrity in high-impedance circuits |
| Dynamic Resistance (RD) | 0.098 Ω - governs voltage rise above VCL under increasing surge current; critical for low-voltage system margining |
| Temperature Coefficient (αT) | 9.6 × 10⁻⁴ /°C - quantifies VBR drift with junction temperature, enabling derating in hot environments |
Pinout & Package
The BZW50-22 is housed in the axial-leaded R6 package (DO-201AD), featuring two terminals: anode and cathode. The cathode is marked by a band on the body. Lead finish is matte tin plating, compliant with J-STD-002 and RoHS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal for unidirectional TVS | Connected to protected line; conducts surge current toward ground when cathode is held at higher potential |
| Cathode | Ground-reference terminal (marked with band) | Typically tied to system ground or low-impedance return path; defines polarity and clamping reference |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature operation | Junction rated to +175 °C - supports deployment in engine compartments and enclosed power converters without derating |
| Low dynamic resistance | 0.098 Ω - minimizes voltage overshoot during fast-rising transients, preserving downstream IC voltage tolerances |
| IEC 61000-4-2 compliance | ±30 kV air/contact discharge - exceeds industrial immunity requirements for front-panel and interface ports |
| Planar junction construction | Enables stable leakage (<5 µA) and repeatable VBR/VCL - critical for long-term reliability in SMPS feedback paths |
| ECOPACK®-compliant packaging | R6 package with matte tin leads - satisfies RoHS, JEDEC JESD22-B102 E3, and whisker resistance (JESD201 Class 2) |
Applications
| Industrial Power Supply Protection | Telecom Line Card Surge Suppression |
|---|---|
|
Use Scenario: Protecting 24 V DC input rails in programmable logic controllers against induced lightning surges and switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground, clamping transients within 10 ns to prevent damage to upstream rectifiers and downstream DC-DC controllers. Use Value: Clamps at ≤39.4 V under 127 A surge, maintaining safe margin below 42 V-rated MOSFET gate drivers and 36 V input LDOs. |
Use Scenario: Safeguarding RS-485 transceivers and Ethernet PHYs on telecom access equipment exposed to field-induced ESD and AC-line coupling. IC Role / Device Role / Timing Role: Discrete TVS mounted at board edge, shunting common-mode surges before they propagate into isolation barriers and data lines. Use Value: Withstands ±30 kV IEC 61000-4-2 contact discharge and maintains <5 µA leakage at 22 V, avoiding bias current errors in precision receiver inputs. |
| Automotive Body Control Module (BCM) | Renewable Energy Inverter DC Link |
|
Use Scenario: Protecting LIN bus transceivers and sensor supply lines in BCMs subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS connected between 12 V battery rail and local ground, absorbing repetitive 100 V/50 ms transients without degradation. Use Value: Rated for 175 °C operation and 5000 W (10/1000 µs), ensuring survival in under-hood thermal environments where polymer TVS devices fail. |
Use Scenario: Shielding photovoltaic string combiner box electronics from DC-side lightning surges in solar farms. IC Role / Device Role / Timing Role: High-power TVS installed across PV+ and PV− terminals, diverting multi-kA 8/20 µs surges away from MPPT controllers and monitoring ICs. Use Value: Delivers up to 60 kW peak power (8/20 µs) and 3700 W at Tj = 175 °C, sustaining protection capability even during sustained high-temperature operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A | Lower PPP (600 W), smaller SMB package, 35.5 V clamping at 17.1 A | Targeted at lower-energy signal-line protection; insufficient for 5 kA-level DC rail surges | Select only for space-constrained, low-surge applications where R6 thermal mass is unnecessary |
| 1.5KE22A | Same R6 package, but glass-passivated junction; 37.5 V clamping at 134 A, 5000 W rating | Higher leakage (~10 µA) and no IEC 61000-4-2 certification; less suitable for ESD-critical interfaces | Prefer for cost-sensitive industrial controls where ESD compliance is not mandated |
Compared with SMBJ22A and 1.5KE22A, the BZW50-22 provides superior thermal stability at 175 °C, lower dynamic resistance (0.098 Ω vs. ≥0.2 Ω), and verified IEC 61000-4-2 level 4 compliance - making it the preferred choice for high-reliability DC power rail protection where surge magnitude and ambient temperature coexist.
Availability
BZW50-22 is available at Aetrix Electronics and suitable for industrial power supply protection, telecom line card surge suppression, and automotive body control module design requiring stable component supply and full traceability.
Supply support for BZW50-22 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 automotive, industrial, and power discrete solutions with vertical manufacturing and broad IP portfolio.
The BZW50 series belongs to ST's high-power TVS diode product line, engineered specifically for robust, high-temperature DC rail protection in mission-critical infrastructure where reliability under repeated surge stress is non-negotiable.
FAQ
What is the maximum clamping voltage of BZW50-22 at 100 A surge current?
The clamping voltage is not linearly scalable, but per DS0662 Rev 8 Figure 5, at 100 A (10/1000 µs), VCL is approximately 37.5 V. This is derived from the 39.4 V max at 127 A and dynamic resistance of 0.098 Ω, confirming sub-38 V clamping for most real-world 100 A events.
Can BZW50-22 be used in bidirectional signal lines?
No - BZW50-22 is unidirectional. For bidirectional protection, use BZW50-22B, which has symmetrical clamping in both polarities and identical stand-off (22 V) and clamping (39.4 V) specifications in either direction.
Does BZW50-22 require heatsinking for 5000 W pulse handling?
No external heatsink is required for single-pulse 5000 W (10/1000 µs) events, as energy dissipation occurs too rapidly for thermal diffusion. However, PCB copper area under leads (≥3 cm² per lead) is recommended to sustain repeated surges and maintain Rth(j-a) ≤ 40 °C/W per Figure 12.
How does junction temperature affect breakdown voltage in BZW50-22?
VBR increases with temperature at 9.6 × 10⁻⁴ /°C. At 125 °C, VBR rises by ~0.096 V/°C × 100 °C = +9.6 V above its 25 °C value, reaching ~34 V. This positive TC ensures safer margining during thermal stress versus negative-TC Zeners.
BZW50-22 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:
- 1
- Bidirectional Channels:
- -
- 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:
- 8500pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- R-6
BZW50-22 FAQ
1.How can I place an order for BZW50-22 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW50-22 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 BZW50-22 reliable?
The price and inventory of BZW50-22 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW50-22 is usually 5 days.
3.What payment methods are accepted for BZW50-22?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW50-22 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW50-22?
BZW50-22 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW50-22 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 BZW50-22?
For technical support, including BZW50-22 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW50-22 requirements.
6.How does Aetrix verify that BZW50-22 is sourced from the original manufacturer or authorized distributors?
All BZW50-22 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 BZW50-22 meets industry standards.
7.What is the process for return or replacement of BZW50-22?
All BZW50-22 units undergo pre-shipment inspection (PSI). If there is an issue with BZW50-22, 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 BZW50-22 part is unused and in its original packaging.
Return procedure for BZW50-22:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW50-22 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
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
