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Taiwan Semiconductor Corporation BZW04-342B
- Part No.:
- BZW04-342B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-342B.pdf
- Description:
- TVS DIODE 342VWM 548VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,962
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Product details
Overview
BZW04-342B 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 342 V working stand-off voltage (VWM), 380–420 V breakdown voltage (VBR) at 1 mA, 548 A peak pulse current (IPP), 0.75 μA reverse leakage at VWM, and 400 W peak pulse power rating at 10/1000 μs waveform - deployed in automotive lighting control modules to clamp load-dump transients.
For engineers reviewing the BZW04-342B datasheet, BZW04-342B pinout, BZW04-342B application, or BZW04-342B equivalent, key selection criteria include clamping voltage (VC = 548 V @ IPP), thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification status, DO-41 package compatibility, and bidirectional variant availability (BZW04-342B vs. BZW04-342).
Technical Context
The BZW04-342B operates as a silicon avalanche diode with unidirectional polarity, triggered when reverse voltage exceeds its 380–420 V breakdown threshold. Its low dynamic impedance ensures rapid clamping response (<1 ns), and it sustains 400 W non-repetitive surges per IEC 61000-4-5 Level 4 compliance.
Designed for mounting on 5 × 5 mm copper pads, it delivers RθJL = 60 °C/W junction-to-lead thermal resistance and supports steady-state dissipation of 1 W at TL = 75 °C. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 342 V - maximum continuous reverse operating voltage before conduction begins; sets system overvoltage trip margin |
| VBR @ IT=1 mA | 380–420 V - verified avalanche onset range; defines minimum clamping threshold under standardized test condition |
| IPP @ 10/1000 μs | 548 A - peak surge current capability; determines survivability against ISO 7637-2 Pulse 5a load-dump events |
| VC @ IPP | 548 V - clamped voltage during full-rated surge; directly limits stress on downstream MOSFETs or controllers |
| ID @ VWM | 0.75 μA - ultra-low leakage ensures minimal standby power loss in high-impedance monitoring circuits |
| TJ max | +175 °C - extended junction temperature rating enables use in under-hood automotive environments |
| Package | DO-204AL (DO-41) - industry-standard axial leaded package with tin-plated leads compliant to J-STD-002 solderability |
Pinout & Package
DO-204AL (DO-41) axial-leaded package with cathode band marking for unidirectional polarity. Leads are pure tin-plated and solderable per J-STD-002. Device weight is approximately 0.300 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; conducts during forward surge events (e.g., ESD contact discharge) |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 24 V rail); initiates avalanche breakdown when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock per AEC standard |
| 400 W peak pulse power | Withstands ISO 7637-2 Pulse 5a (load dump) without degradation when mounted per JEDEC standards |
| 0.75 μA ID @ VWM | Enables integration into always-on battery-monitoring circuits without measurable quiescent current penalty |
| RθJA = 100 °C/W | Permits thermal design margin up to +125 °C ambient when using recommended 5 × 5 mm copper pads per lead |
| UL 94V-0 molding compound | Ensures flame-retardant housing integrity in enclosed automotive junction boxes and lighting housings |
Applications
| Automotive Lighting Control | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and MOSFETs in 24 V truck headlamp modules from alternator load-dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V supply rail and ground to clamp surges above 342 V. Use Value: Limits clamped voltage to 548 V, preventing gate oxide rupture in downstream N-channel high-side switches rated ≤600 V. |
Use Scenario: Safeguarding digital input terminals of programmable logic controllers exposed to inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: Standoff protector on 24 V DC input channel, absorbing repetitive 100 V/1 A transients per IEC 61000-4-4. Use Value: Maintains <0.75 μA leakage at nominal 24 V, avoiding false triggering of Schmitt-trigger input comparators. |
| DC Power Rail Surge Suppression | ESD-Protected Sensor Interface |
Use Scenario: Front-end protection for 300 V DC bus in solar charge controllers subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on PV input stage, coordinated with MOV and fuse for staged overvoltage defense. Use Value: Delivers 400 W peak power handling at 10/1000 μs, enabling single-device suppression of Category C3 surges per IEC 61643-31. |
Use Scenario: Secondary-level ESD protection on analog sensor lines (e.g., pressure transducers) in engine control units. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ <100 pF) placed after RC filter to absorb ±15 kV contact discharge per ISO 10605. Use Value: Achieves sub-nanosecond response time and <548 V clamping, preserving signal integrity of mV-range 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 |
|---|---|---|---|
| SMBJ340A | Same DO-214AA package; lower PPK = 600 W but higher VC = 557 V at 432 A; no AEC-Q101 listing | Preferred for cost-sensitive industrial SMPS where automotive qualification is not required | Select SMBJ340A only if board space allows SMC/SMB footprint and AEC-Q101 is unnecessary |
| P6SMB330A | DO-214AA package; PPK = 600 W, VWM = 330 V, VC = 530 V @ 452 A; RoHS-compliant but not halogen-free | Better clamping ratio (VC/VWM = 1.61) than BZW04-342B (VC/VWM = 1.60), but lacks IEC 61249-2-21 halogen-free certification | Choose P6SMB330A when lowest possible clamping voltage is critical and halogen-free compliance is waived |
Compared with SMBJ340A and P6SMB330A, the BZW04-342B offers AEC-Q101 qualification, halogen-free construction, and DO-41 through-hole compatibility - making it uniquely suitable for legacy automotive harness designs requiring axial-leaded robustness and traceable compliance documentation.
Availability
BZW04-342B is available at Aetrix Electronics and suitable for automotive lighting systems, industrial PLC input stages, and DC power rail surge suppression requiring stable component supply across multi-year production cycles.
Supply support for BZW04-342B 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 MOSFETs for automotive and industrial markets.
The BZW04 series was developed specifically for high-reliability transient suppression in harsh-environment applications - emphasizing AEC-Q101 compliance, extended temperature operation, and precise VWM/VBR matching for predictable clamping behavior.
FAQ
What is the polarity configuration of the BZW04-342B?
The BZW04-342B is a unidirectional TVS diode with cathode band marking indicating the clamping terminal. It conducts in forward bias like a standard diode and avalanches in reverse bias above its 380–420 V breakdown voltage. This polarity enables targeted protection of positive-rail systems without affecting normal forward operation of downstream circuitry. The BZW04-342B must be oriented with cathode toward the protected line and anode to ground.
Does the BZW04-342B meet AEC-Q101 qualification?
Yes, the BZW04-342B is AEC-Q101 qualified - confirmed by Taiwan Semiconductor's official documentation and ordering code suffix "H" (e.g., BZW04-342BH). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and mechanical shock, validating its suitability for automotive under-hood and chassis applications. The BZW04-342B carries full AEC-Q101 test reports accessible via TSC's authorized distributor portals.
What is the clamping voltage of the BZW04-342B at its rated peak current?
The BZW04-342B has a maximum clamping voltage (VC) of 548 V when subjected to its rated peak pulse current (IPP) of 548 A under the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage imposed on protected circuitry during worst-case surge events. The BZW04-342B maintains this clamping performance across its full operating temperature range of −55 °C to +175 °C.
Can the BZW04-342B be used in bidirectional configurations?
No, the BZW04-342B is strictly unidirectional. For bidirectional protection, Taiwan Semiconductor specifies the BZW04-342B variant - which shares identical VWM (342 V), VBR (380–420 V), and PPK (400 W) ratings but uses symmetrical avalanche structure. The BZW04-342B and BZW04-342B are separate orderable parts with distinct marking and polarity; substituting one for the other without circuit review will result in failed protection.
What is the thermal resistance specification for the BZW04-342B?
The BZW04-342B has a junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on a printed circuit board with 10 mm lead length, and a lower junction-to-lead resistance (RθJL) of 60 °C/W. These values assume JEDEC-standard copper pad layout (5 × 5 mm per terminal) and define safe power derating curves - for example, steady-state dissipation drops to ~0.5 W at TA = 125 °C. The BZW04-342B's RθJA enables reliable operation in sealed enclosures up to +105 °C ambient.
BZW04-342B 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):
- 342V
- Voltage - Breakdown (Min):
- 380V
- Voltage - Clamping (Max) @ Ipp:
- 548V
- Current - Peak Pulse (10/1000µs):
- 750mA
- 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)
BZW04-342B FAQ
1.How can I place an order for BZW04-342B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-342B 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 BZW04-342B reliable?
The price and inventory of BZW04-342B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-342B is usually 5 days.
3.What payment methods are accepted for BZW04-342B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-342B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-342B?
BZW04-342B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-342B 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 BZW04-342B?
For technical support, including BZW04-342B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-342B requirements.
6.How does Aetrix verify that BZW04-342B is sourced from the original manufacturer or authorized distributors?
All BZW04-342B 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 BZW04-342B meets industry standards.
7.What is the process for return or replacement of BZW04-342B?
All BZW04-342B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-342B, 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 BZW04-342B part is unused and in its original packaging.
Return procedure for BZW04-342B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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