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Taiwan Semiconductor Corporation BZW04-31B
- Part No.:
- BZW04-31B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-31B.pdf
- Description:
- TVS DIODE 30.8VWM 49.9VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:8,963
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Product details
Overview
BZW04-31B from Taiwan Semiconductor is a unidirectional transient voltage suppressor diode (TVS) 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 modules to safeguard microcontrollers against load-dump transients.
For engineers reviewing the BZW04-31B datasheet, BZW04-31B pinout, BZW04-31B application, or BZW04-31B equivalent, key selection criteria include verified clamping performance under 10/1000 μs surges, unidirectional polarity marking, DO-41 package thermal derating above 25°C, and compliance with AEC-Q101 stress testing for automotive-grade reliability.
Technical Context
The BZW04-31B operates as a silicon avalanche diode that enters controlled breakdown when reverse voltage exceeds its VBR threshold, diverting surge current away from protected circuitry. Its low dynamic impedance ensures stable clamping at VC = 49.9 V under 8.0 A IPP, while junction-to-lead thermal resistance of 60 °C/W supports sustained energy dissipation during repetitive transients.
Designed for unidirectional operation only, it exhibits typical reverse leakage ID < 1 μA at 30.8 V (VWM) and a temperature coefficient of 0.099 %/°C for VBR, enabling predictable voltage drift across its –55 °C to +175 °C operating junction range without external biasing or control logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30.8 V - Maximum continuous reverse operating voltage before significant leakage begins |
| VBR @ IT=1 mA | 34.2–37.8 V - Breakdown voltage range defining reliable avalanche onset under standardized test conditions |
| VC @ IPP=8.0 A | 49.9 V - Clamped voltage during 10/1000 μs surge, limiting downstream IC stress to safe levels |
| PPK | 400 W - Peak pulse power handling capacity per single non-repetitive 1 ms surge |
| IFSM | 40 A - Peak forward surge current tolerance for 8.3 ms half-sine wave, supporting inductive turn-off events |
| TJ Range | –55 °C to +175 °C - Full operational junction temperature span validated for under-hood automotive 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, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| 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 | Avalanche breakdown terminal | Marked with band; connected to protected line (e.g., 24 V rail) to clamp positive transients |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified variant available | Validated for automotive electronics per stress test requirements including HTOL, TC, UHAST, and ESD |
| Low impedance surge response | Dynamic impedance < 2.4 Ω calculated from (VC − VBR)/IPP, ensuring minimal voltage overshoot during fast transients |
| Very fast response time | Sub-nanosecond avalanche initiation enables clamping before sensitive ICs experience overvoltage damage |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained production environments |
Applications
| Automotive Lighting Control | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LED driver ICs in headlamp modules from load-dump transients up to 35 V during battery disconnect events. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V supply rail and ground to clamp positive surges before reaching buck controller inputs. Use Value: Limits clamped voltage to 49.9 V at 8.0 A, preventing latch-up or gate oxide rupture in 36 V-rated power management ICs. | Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: TVS mounted at field-wire entry point to shunt 10/1000 μs surges induced by relay coil de-energization. Use Value: Withstands 400 W pulses and maintains <1 μA leakage at 30.8 V, preserving signal integrity during normal 24 VDC operation. |
| Power Supply Input Stage | ESD-Sensitive Sensor Interface |
Use Scenario: Front-end protection for DC-DC converters in vehicle infotainment systems subjected to ISO 7637-2 Pulse 1 and Pulse 2a transients. IC Role / Device Role / Timing Role: Primary surge suppression device on main 12 V input, upstream of input filter capacitors and switching regulator. Use Value: 60 °C/W junction-to-lead thermal resistance allows effective heat transfer to PCB copper, sustaining repeated surge events without thermal runaway. | Use Scenario: Secondary-level protection for analog sensor signal lines (e.g., temperature or pressure sensors) in engine control units. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ < 100 pF at zero bias) placed adjacent to ADC input pins to suppress ESD without distorting low-frequency signals. Use Value: Clamps ±15 kV contact ESD per IEC 61000-4-2 while adding negligible loading to mV-level sensor outputs. |
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 VWM, 36.7–40.6 V VBR, 53.3 V VC @ 7.5 A, 600 W PPK | Surface-mount footprint; higher clamping voltage but greater peak power; requires PCB rework for replacement | Select when board space is constrained and SMT assembly is preferred over through-hole DO-41 mounting. |
| P6KE33A | DO-15 package, 33 V VWM, 36.7–40.6 V VBR, 53.3 V VC @ 7.5 A, 600 W PPK, no AEC-Q101 option | Larger body than DO-41; identical electrical specs but lacks automotive qualification and tighter thermal resistance | Choose for cost-sensitive industrial applications where AEC-Q101 compliance and 60 °C/W RθJL are not required. |
Compared with SMBJ33A and P6KE33A, the BZW04-31B offers a smaller DO-41 footprint, AEC-Q101 qualification, and superior thermal performance (60 °C/W vs. ~75 °C/W for DO-15/DO-214AA), making it optimal for space-constrained, thermally demanding automotive modules requiring long-term reliability validation.
Availability
BZW04-31B is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and DC power supply input stage designs requiring stable component supply with full traceability and lifecycle continuity.
Supply support for BZW04-31B 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 headquartered in Hsinchu, Taiwan, specializing in discrete power devices, rectifiers, TVS diodes, and analog ICs since 1979.
The BZW04 series belongs to TSC's automotive-qualified TVS portfolio, engineered specifically for robust transient immunity in harsh environments - emphasizing low clamping ratio, AEC-Q101 compliance, and thermal stability for under-hood and chassis-mounted electronics.
FAQ
What is the maximum clamping voltage of the BZW04-31B under standard 10/1000 μs surge conditions?
The BZW04-31B 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 standards and reflects the actual voltage seen by downstream circuitry during surge events. The BZW04-31B maintains this clamping performance consistently across its rated junction temperature range, making it suitable for protecting 36 V-rated ICs in automotive power systems.
Is the BZW04-31B suitable for bidirectional transient protection?
No, the BZW04-31B is a unidirectional TVS diode and is not rated for bidirectional operation. Its datasheet specifies only unidirectional parameters (e.g., VBR min/max at 1 mA, VC at IPP), and the device marking includes a cathode band indicating polarity. For bidirectional protection, the BZW04-31B variant does not exist - engineers must select the BZW04-31BB instead, which is explicitly designated as bidirectional in TSC's ordering code and parameter tables.
Does the BZW04-31B meet AEC-Q101 qualification requirements?
The base BZW04-31B part number is not AEC-Q101 qualified; however, the AEC-Q101 variant is designated as BZW04-31BH in TSC's ordering nomenclature. Per the official datasheet revision J2104, only parts suffixed with "H" (e.g., BZW04-31BH) undergo full AEC-Q101 stress testing including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing. The BZW04-31B remains suitable for industrial applications but requires the "H" suffix for automotive qualification.
What is the thermal resistance from junction to lead (RθJL) for the BZW04-31B?
The BZW04-31B has a typical junction-to-lead thermal resistance (RθJL) of 60 °C/W, as specified in the Thermal Performance section of the datasheet. This value is measured with leads soldered to 5 × 5 mm copper pads and enables accurate thermal modeling for surge duty-cycle analysis. When used in high-repetition surge environments, this low RθJL allows efficient heat transfer from the silicon die to the PCB, reducing risk of thermal runaway compared to higher-RθJL alternatives like DO-15 packaged TVS diodes.
How does the BZW04-31B compare to the P6KE33A in terms of physical packaging and mounting?
The BZW04-31B uses a DO-204AL (DO-41) axial-leaded package with 0.300 g mass and standard lead spacing for through-hole insertion, whereas the P6KE33A uses the larger DO-15 package with different lead pitch and body dimensions. This means direct substitution requires PCB layout modification - the BZW04-31B cannot be mounted in a P6KE33A footprint without adapter hardware or board redesign. Both share similar electrical ratings but differ mechanically and in qualification status.
BZW04-31B 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:
- -
- Bidirectional Channels:
- 1
- 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)
BZW04-31B FAQ
1.How can I place an order for BZW04-31B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-31B 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 BZW04-31B reliable?
The price and inventory of BZW04-31B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-31B is usually 5 days.
3.What payment methods are accepted for BZW04-31B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-31B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-31B?
BZW04-31B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-31B 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 BZW04-31B?
For technical support, including BZW04-31B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-31B requirements.
6.How does Aetrix verify that BZW04-31B is sourced from the original manufacturer or authorized distributors?
All BZW04-31B 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 BZW04-31B meets industry standards.
7.What is the process for return or replacement of BZW04-31B?
All BZW04-31B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-31B, 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 BZW04-31B part is unused and in its original packaging.
Return procedure for BZW04-31B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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