My Inquiry
My Account
STMicroelectronics BZW50-33RL
- Part No.:
- BZW50-33RL
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- R-6, Axial
- Datasheet:
-
BZW50-33RL.pdf
- Description:
- TVS DIODE 33VWM 76VC R6
- Quantity:
- Payment:
- Shipping:
Inventory:2,834
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZW50-33RL 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 59 V (max) under 85 A surge, and operates up to 175 °C junction temperature - enabling robust protection in industrial power supplies and telecom infrastructure.
For engineers reviewing the BZW50-33RL datasheet, BZW50-33RL pinout, BZW50-33RL application, or BZW50-33RL equivalent, this device is selected for IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-4 level 4 (4 kV) compliance, low leakage (<5 µA at 33 V), and R6 package compatibility with high thermal reliability in SMPS and base station front-end circuits.
Technical Context
The BZW50-33RL uses planar silicon junction technology optimized for low dynamic resistance (0.218 Ω) and stable clamping across temperature (αT = 10 × 10−4/°C). Its unidirectional configuration supports anode-to-cathode surge conduction only, with breakdown voltage tightly specified at 36.6 V (min) to 40.7 V (max) at 1 mA.
It sustains 500 A non-repetitive forward surge current (IFSM) and exhibits <1 nF junction capacitance at 1 MHz, making it suitable for protecting medium-speed analog and digital lines without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 33 V - maximum continuous reverse operating voltage before leakage exceeds 5 µA |
| Breakdown Voltage (VBR) | 36.6–40.7 V @ 1 mA - precise triggering threshold ensuring early clamping onset |
| Clamping Voltage (VCL) | 59 V @ 85 A (10/1000 µs) - limits downstream voltage stress during surge events |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs) - enables protection against lightning-induced surges per IEC 61000-4-5 |
| Junction Temperature Range | −55 °C to +175 °C - supports operation in harsh environments including automotive under-hood and industrial motor drives |
| Leakage Current (IRM) | <5 µA @ 33 V - minimizes standby power loss and avoids false triggering in low-power systems |
| Dynamic Resistance (RD) | 0.218 Ω - ensures consistent clamping performance across varying surge amplitudes |
Pinout & Package
The BZW50-33RL 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. This through-hole package supports high thermal dissipation via PCB copper area and withstands 260 °C soldering for 10 s at 5 mm from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current entry point (unidirectional) | Connected to protected line; conducts only when reverse-biased beyond VBR |
| Cathode | Surge current return path | Marked with band; ties to ground or lower-potential rail to shunt transients safely |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature operation | Rated for continuous use up to Tj = 175 °C - eliminates derating concerns in enclosed power converters |
| Low dynamic resistance | 0.218 Ω - reduces VCL rise under high-current surges, improving system-level ESD immunity margin |
| IEC 61000-4-2 Level 4 compliance | ±30 kV air/contact discharge - meets stringent end-equipment immunity requirements for industrial and telecom gear |
| Planar junction construction | Enables <1 nF junction capacitance - preserves signal integrity on data lines up to ~100 MHz |
| Matt tin-plated leads | Complies with J-STD-002, JESD 22-B102 E3, and MIL-STD-750 Method 2026 - ensures long-term solderability and whisker resistance |
Applications
| Industrial Power Supply Input Protection | Telecom Line Card Surge Suppression |
|---|---|
|
Use Scenario: Protects AC/DC rectifier outputs and DC bus inputs against lightning-induced surges and load dump transients in DIN-rail mounted PSUs. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between +VIN and GND to clamp overvoltage spikes before they reach downstream regulators and controllers. Use Value: Withstands 5000 W (10/1000 µs) and maintains clamping below 59 V, preventing MOSFET gate oxide failure and IC latch-up in 24–48 V systems. |
Use Scenario: Shields Ethernet PHY interfaces and RS-485 transceivers on telecom line cards exposed to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Standoff-rated TVS placed on differential pairs or single-ended bias rails to absorb fast transients without distorting signal edges. Use Value: Sub-1 nF capacitance avoids signal jitter; ±30 kV ESD rating exceeds GR-1089-CORE requirements for central office equipment. |
| Automotive Body Control Module (BCM) Inputs | Renewable Energy Inverter DC Link Protection |
|
Use Scenario: Safeguards microcontroller GPIOs and sensor inputs in BCMs connected to external switches, lamps, and LIN buses subject to ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Low-leakage (≤5 µA) unidirectional TVS used on 12 V supply rails and wake-up lines to prevent false wake-ups and latch-up. Use Value: Stable VBR over −40 °C to +125 °C ambient ensures reliable triggering across vehicle operating range; 175 °C Tj max allows compact layout near heat sources. |
Use Scenario: Protects IGBT gate drivers and auxiliary power rails in solar string inverters subjected to grid-switching transients and capacitor bank switching noise. IC Role / Device Role / Timing Role: High-power TVS placed across DC link capacitors and control supply inputs to suppress dV/dt spikes and ringback oscillations. Use Value: 3700 W clamping capability at Tj = 175 °C enables sustained protection during extended overload conditions without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | Lower PPP (600 W), smaller SMB package, higher VCL (53.3 V @ 11.8 A) | Limited to sub-1 kW surges; unsuitable for IEC 61000-4-5 level 3+ or high-current industrial lines | Select when space-constrained PCBs require SMT mounting and surge energy is ≤100 mJ |
| 1.5KE33A | Same R6 package, but glass-passivated junction; higher VCL (53.3 V @ 94 A), lower IFSM (200 A) | Less stable VBR tempco (αT ≈ 12 × 10−4/°C); reduced reliability in thermally cycling environments | Choose for cost-sensitive legacy designs where UL 497B listing is not required and thermal cycling is minimal |
Compared with SMBJ33A and 1.5KE33A, the BZW50-33RL provides superior surge handling (5000 W vs. ≤600 W), tighter VBR tolerance, and verified IEC 61000-4-2/4-4 compliance - making it the preferred choice for mission-critical industrial and telecom protection where long-term reliability and high-energy immunity are mandatory.
Availability
BZW50-33RL is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, automotive body control modules, and renewable energy inverters requiring stable component supply with full traceability and lifecycle support.
Supply support for BZW50-33RL 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, delivering intelligent power, sensing, and control 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 communication infrastructure applications.
FAQ
What is the maximum clamping voltage of BZW50-33RL at 85 A?
The maximum clamping voltage (VCL) of BZW50-33RL is 59 V when subjected to an 85 A, 10/1000 µs surge waveform at Tamb = 25 °C. This value increases linearly with junction temperature at a coefficient of 10 × 10−4/°C, reaching approximately 62.5 V at Tj = 125 °C.
Is BZW50-33RL RoHS-compliant and halogen-free?
Yes, BZW50-33RL is manufactured in ST's ECOPACK2-compliant R6 package, meeting RoHS Directive 2011/65/EU and being halogen-free per IEC 61249-2-21. The matte tin lead finish satisfies JESD 22-B102 E3 and MIL-STD-750 Method 2026 for solderability and whisker resistance.
Can BZW50-33RL be used in bidirectional configurations?
No - BZW50-33RL is a unidirectional TVS diode, intended for protection of DC lines referenced to ground. For bidirectional protection, ST offers the BZW50-33B variant, which features symmetrical breakdown in both polarities and identical clamping performance in either direction.
What is the thermal resistance junction-to-ambient for BZW50-33RL on a standard FR4 PCB?
On a standard epoxy FR4 board with 70 µm copper thickness, the thermal resistance junction-to-ambient (Rth(j-a)) of BZW50-33RL is 40 °C/W when mounted with 2 cm² copper area per lead. With 5 cm² total copper, Rth(j-a) improves to ~22 °C/W, enabling sustained 6.5 W power dissipation at Tamb = 75 °C.
BZW50-33RL 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):
- 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:
- 5750pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- R-6
BZW50-33RL FAQ
1.How can I place an order for BZW50-33RL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW50-33RL 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 BZW50-33RL reliable?
The price and inventory of BZW50-33RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW50-33RL is usually 5 days.
3.What payment methods are accepted for BZW50-33RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW50-33RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW50-33RL?
BZW50-33RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW50-33RL 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 BZW50-33RL?
For technical support, including BZW50-33RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW50-33RL requirements.
6.How does Aetrix verify that BZW50-33RL is sourced from the original manufacturer or authorized distributors?
All BZW50-33RL 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 BZW50-33RL meets industry standards.
7.What is the process for return or replacement of BZW50-33RL?
All BZW50-33RL units undergo pre-shipment inspection (PSI). If there is an issue with BZW50-33RL, 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 BZW50-33RL part is unused and in its original packaging.
Return procedure for BZW50-33RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW50-33RL 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…
