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Taiwan Semiconductor Corporation BZW04-31
- Part No.:
- BZW04-31
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-31.pdf
- Description:
- TVS DIODE 30.8VWM 49.9VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,614
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Product details
Overview
BZW04-31 from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power rails and signal lines. It features a 30.8 V working stand-off voltage, 34.2–37.8 V breakdown voltage at 1 mA, 49.9 V clamping voltage at 8.0 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive lighting control and industrial sensor interface circuits.
For engineers reviewing the BZW04-31 datasheet, BZW04-31 pinout, BZW04-31 application, or BZW04-31 equivalent, key selection criteria include clamping performance under 8.0 A surge, thermal resistance (60 °C/W junction-to-lead), DO-41 package compatibility, and AEC-Q101 qualification availability for automotive-grade reliability validation.
Technical Context
The BZW04-31 operates as a silicon avalanche diode with unidirectional polarity, triggered when reverse voltage exceeds its 34.2–37.8 V breakdown range. Its low dynamic impedance ensures rapid clamping response to transients, while sub-1 µA leakage at 30.8 V supports low-power system standby integrity.
Rated for 175 °C maximum junction temperature and compliant with JESD201 Class 2 whisker resistance, it sustains repetitive surge events only within derated power limits above 25 °C ambient - validated by Fig.2 pulse derating and Fig.3 10/1000 µs waveform compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30.8 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1 mA | 34.2–37.8 V - Avalanche breakdown threshold defining turn-on precision |
| VC @ IPP=8.0 A | 49.9 V - Clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPK | 400 W - Peak pulse power handling capability under standardized surge waveform |
| RθJL | 60 °C/W - Junction-to-lead thermal resistance, critical for PCB copper pad layout design |
| TJ max | 175 °C - Absolute maximum junction temperature, enabling high-ambient industrial use |
Pinout & Package
Package: DO-204AL (DO-41), axial-leaded, epoxy-molded case with cathode band marking for unidirectional polarity. Leads are pure tin-plated and solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration |
| Cathode | Reverse-biased surge clamp terminal | Connected to protected line (e.g., 24 V rail or signal input); marked with band |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V systems |
| Clamping voltage ≤ 49.9 V at 8.0 A | Keeps protected IC inputs below absolute maximum ratings during fast transients |
| Leakage current < 1 µA at 30.8 V | Minimizes standby power loss in battery-backed or energy-sensitive applications |
| AEC-Q101 qualified version available | Supports automotive subsystems requiring certified reliability for engine control or lighting modules |
Applications
| Automotive LED Headlamp Driver Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protects MOSFET gate drivers and current-sense amplifiers in 24 V LED headlamp modules from load-dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between supply rail and ground, clamping spikes before they reach sensitive analog front-end ICs. Use Value: Limits voltage excursion to ≤49.9 V during 8.0 A surges, preventing latch-up or oxide breakdown in 30 V-rated driver ICs. | Use Scenario: Shields 24 V digital input channels of programmable logic controllers from field-wiring EFT bursts and relay-coil flyback. IC Role / Device Role / Timing Role: Standoff device across input terminals, conducting only during >34.2 V transients to shunt energy to chassis ground. Use Value: Sub-1 µA leakage preserves input hysteresis thresholds; DO-41 package allows through-hole mounting on rugged industrial PCBs. |
| Smart Building Occupancy Sensor Interface | DC Power Rail Surge Suppression |
Use Scenario: Safeguards PIR sensor signal conditioning circuitry and microcontroller GPIOs from ESD events on exposed wiring in HVAC ducts. IC Role / Device Role / Timing Role: Low-capacitance TVS (measured at ~100 pF @ 0 V) placed directly at connector entry point. Use Value: Fast response time and 49.9 V clamping prevent false triggers or ADC saturation during ±8 kV contact ESD per IEC 61000-4-2. | Use Scenario: Installed across 24 V/48 V DC distribution rails in telecom power supplies to absorb lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp in parallel with bulk capacitance, diverting 400 W pulses away from downstream regulators. Use Value: 60 °C/W RθJL enables reliable operation with minimal heatsinking on standard FR-4 boards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | DO-214AA package; 33 V VWM; 53.3 V VC @ 7.5 A; 600 W PPK | Higher clamping voltage and surface-mount form factor - better suited for space-constrained PCBs | Select SMBJ33A when board area is limited and 53.3 V clamping is acceptable for protected ICs |
| P6KE33A | DO-15 package; 33 V VWM; 53.3 V VC @ 7.5 A; 600 W PPK; higher RθJA (75 °C/W) | Legacy through-hole alternative with identical electrical specs but inferior thermal performance | Choose P6KE33A only if DO-15 footprint compatibility is required and thermal margin permits |
Compared with SMBJ33A and P6KE33A, the BZW04-31 offers tighter VBR tolerance (±5.5%), lower RθJL (60 vs. ≥75 °C/W), and AEC-Q101 qualification path - making it preferable for thermally demanding or automotive-critical 24 V rail protection.
Availability
BZW04-31 is available at Aetrix Electronics and suitable for automotive lighting systems, industrial PLC inputs, smart building sensor interfaces, and DC power rail surge suppression requiring stable component supply and long-term manufacturability.
Supply support for BZW04-31 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and thyristors - headquartered in Hsinchu, Taiwan.
The BZW04 series belongs to TSC's high-reliability transient suppression product line, engineered specifically for automotive and industrial environments where robustness against load dump, EFT, and ESD is mandatory.
FAQ
What is the maximum clamping voltage of the BZW04-31 under standard surge conditions?
The BZW04-31 has a maximum clamping voltage (VC) of 49.9 V when subjected to an 8.0 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Is the BZW04-31 suitable for automotive applications?
Yes, the BZW04-31 is suitable for automotive applications when specified with the "H" suffix (e.g., BZW04-31H), indicating AEC-Q101 qualification. The base BZW04-31 meets all electrical and thermal specifications required for under-hood and lighting module use, including 175 °C TJ max and JESD201 Class 2 whisker resistance - though formal qualification requires the H-grade variant.
What is the reverse leakage current specification for the BZW04-31 at its working voltage?
The BZW04-31 exhibits a maximum reverse leakage current (ID) of 1 µA at its working stand-off voltage (VWM) of 30.8 V, measured at 25 °C ambient. This ultra-low leakage preserves system efficiency in always-on or battery-powered circuits and ensures stable biasing of upstream voltage references or comparators.
How does the DO-41 package of the BZW04-31 affect thermal performance?
The DO-41 (DO-204AL) package of the BZW04-31 delivers a junction-to-lead thermal resistance (RθJL) of 60 °C/W, enabling effective heat transfer to PCB copper pads. When mounted on 5 × 5 mm copper pads per lead, it supports full 400 W pulse dissipation at 25 °C - but requires derating above ambient per Fig.2, especially in enclosed enclosures without airflow.
Can the BZW04-31 be used in bidirectional configurations?
No, the BZW04-31 is a unidirectional TVS diode and must not be used in bidirectional applications. For symmetrical surge protection, the designated variant is BZW04-31B - which shares identical VWM, VBR, and VC specs but features center-tapped construction for AC or dual-rail clamping. Using BZW04-31 in place of BZW04-31B risks failure during positive half-cycle transients.
BZW04-31 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):
- 30.8V
- Voltage - Breakdown (Min):
- 34.2V
- Voltage - Clamping (Max) @ Ipp:
- 49.9V
- Current - Peak Pulse (10/1000µs):
- 8A
- 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)
BZW04-31 FAQ
1.How can I place an order for BZW04-31 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-31 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 BZW04-31 reliable?
The price and inventory of BZW04-31 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-31 is usually 5 days.
3.What payment methods are accepted for BZW04-31?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-31 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-31?
BZW04-31 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-31 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 BZW04-31?
For technical support, including BZW04-31 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-31 requirements.
6.How does Aetrix verify that BZW04-31 is sourced from the original manufacturer or authorized distributors?
All BZW04-31 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 BZW04-31 meets industry standards.
7.What is the process for return or replacement of BZW04-31?
All BZW04-31 units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-31, 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 BZW04-31 part is unused and in its original packaging.
Return procedure for BZW04-31:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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