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Taiwan Semiconductor Corporation BZW04-33
- Part No.:
- BZW04-33
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-33.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,998
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Product details
Overview
BZW04-33 from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in DO-15 package, designed for IEC 61000-4-2 ESD protection (30 kV air/contact discharge) and IEC 61000-4-4 surge immunity (4 kV level 4). It features a standoff voltage (VRM) of 33 V, clamping voltage (VCL) of 53.3 V at 8.8 A (8/20 µs), and peak pulse power dissipation of 400 W (10/1000 µs) at 25 °C. It operates up to 175 °C junction temperature and is used in AC/DC power input stages of industrial SMPS.
For engineers reviewing the BZW04-33 datasheet, BZW04-33 pinout, BZW04-33 application, or BZW04-33 equivalent, key selection criteria include its 33 V reverse standoff rating, 53.3 V clamping performance at 8.8 A, low dynamic resistance (1.24 Ω), junction capacitance <510 pF at 0 V, and compatibility with high-reliability 175 °C thermal environments in power supply front-end protection.
Technical Context
The BZW04-33 employs planar silicon junction technology optimized for low leakage (<1 µA at VRM) and stable clamping over temperature (αT = 9.8 × 10⁻⁴ /°C). Its unidirectional configuration provides asymmetric conduction-low forward voltage drop (~1.5 V at 10 A) during surge events while blocking reverse current until breakdown.
It delivers defined surge response under standardized waveforms: 400 W (10/1000 µs) and up to 2.3 kW (8/20 µs), with thermal impedance (Zth(j-a)) of ~100 °C/W for single-pulse conditions on FR4 PCB. The device meets UL 497B (QVGQ2.E136224), IEC 61000-4-2 level 4, and IEC 61000-4-4 level 4 requirements without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 33 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system working voltage margin. |
| Breakdown Voltage (VBR) | 36.7–40.8 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above normal line transients. |
| Clamping Voltage (VCL) | 53.3 V at 8.8 A (8/20 µs) - Peak voltage seen by protected IC during worst-case surge; defines downstream voltage stress limit. |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs) - Sustained energy-handling capability at 25 °C; derates to 230 W at 175 °C junction. |
| Leakage Current (IRM) | <1 µA at 33 V, 25 °C - Enables use in high-impedance sensing or battery-backed circuits without signal corruption. |
| Junction Capacitance (CJ) | 510 pF at 0 V - Low enough for <1 MHz signal integrity; suitable for DC/low-frequency power rails, not high-speed data lines. |
| Operating Junction Temp | −55 to +175 °C - Supports operation in harsh industrial, automotive under-hood, or enclosed power converter environments. |
Pinout & Package
DO-15 (JEDEC DO-204AC) axial-leaded package with matte tin-plated leads. Cathode indicated by band marking; anode is unmarked end. Leads are tinned for solderability per J-STD-002 and JESD 22-B102 E3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry / surge return path | Connected to ground or low-impedance return plane; carries full surge current during clamping. |
| Cathode (banded end) | Reverse-biased terminal / protected line connection | Connected to line being protected (e.g., AC L/N or DC+); blocks normal voltage, avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature reliability | Rated for continuous operation up to 175 °C junction temperature-enables placement near hot components in SMPS. |
| Low dynamic resistance | 1.24 Ω (typ.)-minimizes VCL rise under high-current surges, improving protection margin for downstream MOSFETs or controllers. |
| ESD robustness | 30 kV contact/air discharge per IEC 61000-4-2-exceeds level 4 without external filtering, simplifying board layout. |
| Planar junction construction | Enables tight parameter distribution and low leakage (<1 µA)-critical for precision analog or standby-power-sensitive designs. |
| UL 497B recognition | File QVGQ2.E136224-validates suitability for telecom/data line surge protection per UL safety standards. |
Applications
| Industrial SMPS Input Protection | Telecom Line Interface |
|---|---|
|
Use Scenario: AC/DC adapter or open-frame PSU subjected to lightning-induced surges on mains input (L/N). IC Role / Device Role: Primary-level TVS clamp placed across bridge rectifier output or after common-mode choke. Use Value: Limits transient voltage to ≤53.3 V during 8/20 µs surges, protecting bulk capacitor, PFC controller, and primary-side MOSFET gate drivers. |
Use Scenario: DSL or Ethernet line interface exposed to induced surges from nearby power cables or lightning coupling. IC Role / Device Role: Secondary-side unidirectional TVS on tip/ring lines before isolation transformer or PHY interface. Use Value: Clamps fast transients to safe levels while maintaining <1 µA leakage-preserving signal integrity and minimizing baseline offset in analog front-ends. |
| Automotive Body Control Module | PLC Digital I/O Protection |
|
Use Scenario: 12 V battery-supplied BCM subsystem experiencing load dump or ISO 7637-2 pulse 5a (75 V/400 ms). IC Role / Device Role: Standoff-rated TVS on microcontroller VDD rail or CAN transceiver power line. Use Value: Withstands 175 °C ambient and clamps to 53.3 V, preventing latch-up or permanent damage to 5 V logic supplies during sustained overvoltage events. |
Use Scenario: 24 V digital input module in factory automation subject to inductive switching noise and field wiring surges. IC Role / Device Role: Front-end protection on optocoupler input side, between field wire and internal pull-up resistor. Use Value: Provides 400 W surge handling at 10/1000 µs with low capacitance-ensures clean edge detection and eliminates false triggering from EFT bursts. |
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 | DO-214AA package; 33 V VRM; 53.3 V VCL @ 8.8 A; 600 W PPP (10/1000 µs) | Higher power rating but larger footprint; requires different PCB land pattern and thermal relief design. | Select when higher surge margin (>400 W) is required and board space allows SMB footprint. |
| P6KE33A | DO-15 package; 33 V VRM; 53.3 V VCL @ 8.8 A; 600 W PPP (10/1000 µs); higher IRM (5 µA) | Same package outline but higher leakage and lower temperature rating (150 °C max Tj). | Select only for cost-sensitive, non-high-temp applications where 150 °C junction limit is acceptable. |
Compared with SMBJ33A and P6KE33A, BZW04-33 offers optimal balance of DO-15 compatibility, 175 °C operation, and 1 µA leakage-making it preferred for thermally constrained, high-reliability industrial power supplies where long-term stability is critical.
Availability
BZW04-33 is available at Aetrix Electronics and suitable for industrial SMPS input protection, telecom line interfaces, automotive body control modules, and PLC digital I/O requiring stable component supply across extended temperature and surge stress conditions.
Supply support for BZW04-33 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 microcontrollers for industrial, automotive, and consumer markets.
The BZW04 series belongs to ST's high-reliability TVS portfolio, engineered specifically for robust front-end surge protection in demanding power conversion and communication infrastructure applications where thermal stability and ESD immunity are mission-critical.
FAQ
What is the maximum clamping voltage of BZW04-33 under a standard 8/20 µs surge?
The BZW04-33 clamps to 53.3 V at 8.8 A under an 8/20 µs waveform, as specified in Table 2 of DS0660 Rev 4. This value is measured at 25 °C and increases linearly with junction temperature at a coefficient of 9.8 × 10⁻⁴ /°C, reaching approximately 58.2 V at 175 °C.
Can BZW04-33 be used in bidirectional configurations?
No-BZW04-33 is a unidirectional TVS diode, marked with a single cathode band. For bidirectional protection at 33 V standoff, ST offers the BZW04-33B variant, which has symmetrical breakdown in both polarities and identical clamping performance in either direction.
What is the recommended PCB layout for optimal thermal performance?
Per Figure 12 in DS0660, thermal resistance drops from ~4.5 °C/W to ~2.5 °C/W when copper area under each lead increases from 0 to 5 cm² on FR4. Use ≥2.5 cm² per lead with 70 µm copper thickness and thermal vias to inner ground planes to sustain 230 W peak power at 175 °C junction temperature.
Does BZW04-33 meet RoHS and REACH compliance?
Yes-BZW04-33 is manufactured in ST's ECOPACK2-compliant process, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Lead finish is matte tin, and the device carries no SVHC substances above threshold per latest ST declaration.
BZW04-33 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AL, DO-41, Axial
- Series:
- BZW04
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 7.4A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
BZW04-33 FAQ
1.How can I place an order for BZW04-33 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-33 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 BZW04-33 reliable?
The price and inventory of BZW04-33 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-33 is usually 5 days.
3.What payment methods are accepted for BZW04-33?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-33 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-33?
BZW04-33 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-33 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 BZW04-33?
For technical support, including BZW04-33 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-33 requirements.
6.How does Aetrix verify that BZW04-33 is sourced from the original manufacturer or authorized distributors?
All BZW04-33 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 BZW04-33 meets industry standards.
7.What is the process for return or replacement of BZW04-33?
All BZW04-33 units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-33, 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 BZW04-33 part is unused and in its original packaging.
Return procedure for BZW04-33:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04-33 Tags
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