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Taiwan Semiconductor Corporation BZW04-171B
- Part No.:
- BZW04-171B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-171B.pdf
- Description:
- TVS DIODE 171VWM 274VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,392
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Product details
Overview
BZW04-171B 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 171 V working stand-off voltage (VWM), 190–210 V breakdown voltage (VBR) at 1 mA, 400 W peak pulse power (10/1000 µs), clamping voltage of 274 V at 1.5 A peak impulse current, and operates across –55 °C to +175 °C junction temperature - deployed in automotive lighting control modules and industrial sensor interfaces.
For engineers reviewing the BZW04-171B datasheet, BZW04-171B pinout, BZW04-171B application, or BZW04-171B equivalent, key selection considerations include its DO-41 package compatibility, AEC-Q101 qualification (H-grade variant), low leakage (<1 µA @ 171 V), and precise clamping performance under IEC 61000-4-5 surge conditions.
Technical Context
The BZW04-171B is a silicon avalanche diode optimized for unidirectional clamping in high-voltage DC circuits. Its 171 V VWM ensures stable operation below system overvoltage thresholds, while its 274 V VC@IPP provides predictable voltage limiting during 10/1000 µs transients up to 400 W.
Thermal design is supported by RθJL = 60 °C/W and RθJA = 100 °C/W on PCB, enabling reliable operation at TJ up to 175 °C. The device exhibits a temperature coefficient of 0.108 %/°C for VBR, ensuring stable breakdown across automotive temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 171 V - Maximum continuous reverse operating voltage before clamping initiates; sets safe DC bias margin. |
| VBR @ IT=1 mA | 190–210 V - Measured breakdown range confirming avalanche onset tolerance for robust ESD immunity. |
| VC @ IPP=1.5 A | 274 V - Clamped voltage during 10/1000 µs surge; defines worst-case rail overshoot seen by downstream ICs. |
| PPK | 400 W - Peak pulse power rating per IEC 61000-4-5; validates protection against lightning-induced surges. |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; ensures minimal quiescent power loss in always-on systems. |
| TJ max | +175 °C - Maximum junction temperature; supports under-hood automotive deployment without derating. |
| Package | DO-204AL (DO-41) - Industry-standard axial leaded package with UL 94V-0 molding and tin-plated leads. |
Pinout & Package
DO-204AL (DO-41) package: axial-leaded, glass-passivated silicon junction, cathode indicated by band marking. 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 | Low-side reference terminal | Connected to circuit ground or lowest potential node; completes clamping path during positive transients. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24 V rail); avalanche conduction occurs when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (H-grade) | Validated for automotive under-hood applications including engine control units and lighting drivers. |
| 400 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-to-earth) without degradation. |
| Clamping ratio VC/VBR ≈ 1.42 | Ensures tight voltage control - critical for protecting 300 V-rated MOSFETs and gate drivers. |
| Low thermal resistance (RθJL = 60 °C/W) | Enables efficient heat transfer to PCB copper pads, supporting sustained surge duty cycles. |
| RoHS & halogen-free (IEC 61249-2-21) | Complies with automotive environmental standards and enables use in green manufacturing processes. |
Applications
| Automotive LED Headlamp Driver Protection | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Protects buck-boost controller ICs and current-sense amplifiers in 24 V/48 V LED headlamp modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between supply rail and ground to clamp transients before they reach sensitive analog front-end components. Use Value: Limits rail overshoot to ≤274 V during 100 V/100 ms load dump events, preventing latch-up or gate oxide damage in downstream ICs. |
Use Scenario: Shields 4–20 mA loop receiver inputs in programmable logic controllers from field-wiring induced surges and EFT bursts. IC Role / Device Role / Timing Role: Standoff diode connected across input terminals to absorb fast-rising transients (≤1 ns rise time) before reaching precision op-amps. Use Value: Maintains <1 µA leakage at 24 V nominal, preserving loop accuracy while clamping 1 kV EFT bursts to <300 V. |
| DC Power Distribution Unit (PDU) Surge Suppression | Telecom Remote Radio Unit (RRU) DC Feed Protection |
Use Scenario: Installed on 48 V DC distribution bus in telecom cabinets to protect DC-DC converters and monitoring ICs from lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on main power entry point, coordinated with upstream MOVs for staged energy absorption. Use Value: Delivers 400 W pulse handling with 274 V clamping, reducing stress on secondary-stage TVS arrays and extending overall system surge lifetime. |
Use Scenario: Safeguards 28 V DC feed lines powering remote radio heads mounted on cell towers subject to induced lightning currents. IC Role / Device Role / Timing Role: Unidirectional clamping device placed at RRU enclosure entry, referenced to local ground plane. Use Value: Withstands repeated 10/1000 µs surges up to 1.5 A while maintaining VWM stability across –40 °C to +85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170A | Same VWM (170 V), but SMB package (surface-mount); lower PPK (600 W), higher VC (275 V @ 2.2 A). | Requires PCB rework for SMT layout; better suited for space-constrained designs with automated assembly. | Select SMBJ170A only if board real estate is limited and thermal management via PCB copper is optimized. |
| P6KE180A | Higher VWM (180 V), same DO-41 package; lower PPK (600 W), higher VC (287 V @ 2.1 A), no AEC-Q101 qualification. | Lacks automotive qualification; suitable for industrial/commercial power supplies but not automotive ECUs. | Choose P6KE180A for cost-sensitive non-automotive applications where 180 V standoff suffices and AEC-Q101 is not required. |
Compared with SMBJ170A and P6KE180A, the BZW04-171B offers tighter VWM matching (171 V), guaranteed AEC-Q101 compliance, and lower leakage - making it the preferred choice for automotive lighting and industrial control systems requiring long-term reliability under thermal stress.
Availability
BZW04-171B is available at Aetrix Electronics and suitable for automotive lighting systems, industrial PLC analog inputs, and telecom DC power distribution units requiring stable component supply with full traceability and lifecycle support.
Supply support for BZW04-171B 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, and rectifiers, with global distribution and AEC-Q101 validation capabilities.
The BZW04 series was engineered specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing robustness under repetitive surge stress and extended temperature operation.
FAQ
What is the polarity configuration of the BZW04-171B?
The BZW04-171B is a unidirectional TVS diode, with cathode marked by a band on the DO-41 body. It conducts only during positive transients applied to the cathode relative to anode, making it ideal for DC rail protection where polarity is fixed. This differs from bidirectional variants like BZW04-171BB, which suppress both polarities.
Does the BZW04-171B meet AEC-Q101 requirements?
Yes - the BZW04-171B is AEC-Q101 qualified when ordered with the "H" suffix (e.g., BZW04-171BH). Standard BZW04-171B may be manufactured to the same process but lacks formal qualification documentation unless specified. Always verify ordering code suffixes for automotive compliance.
What is the maximum clamping voltage for the BZW04-171B under standard test conditions?
The BZW04-171B has a maximum clamping voltage (VC) of 274 V when subjected to a 10/1000 µs waveform at 1.5 A peak impulse current (IPP), as defined in the manufacturer's datasheet. This value is measured at TA = 25 °C and represents worst-case voltage seen by protected circuitry during surge events.
Can the BZW04-171B be used in bidirectional surge protection applications?
No - the BZW04-171B is unidirectional only. For bidirectional protection, the designated part is BZW04-171BB (with "BB" suffix), which features symmetrical breakdown in both directions. Using BZW04-171B in AC or reversible-polarity circuits will result in forward conduction and failure.
What is the thermal resistance from junction to lead (RθJL) for the BZW04-171B?
The BZW04-171B has a typical junction-to-lead thermal resistance (RθJL) of 60 °C/W, measured with leads soldered to 5 × 5 mm copper pads. This value enables accurate thermal modeling when designing for repeated surge duty cycles in enclosed automotive or industrial enclosures.
BZW04-171B 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):
- 171V
- Voltage - Breakdown (Min):
- 190V
- Voltage - Clamping (Max) @ Ipp:
- 274V
- Current - Peak Pulse (10/1000µs):
- 1.5A
- 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)
BZW04-171B FAQ
1.How can I place an order for BZW04-171B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-171B 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 BZW04-171B reliable?
The price and inventory of BZW04-171B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-171B is usually 5 days.
3.What payment methods are accepted for BZW04-171B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-171B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-171B?
BZW04-171B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-171B 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 BZW04-171B?
For technical support, including BZW04-171B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-171B requirements.
6.How does Aetrix verify that BZW04-171B is sourced from the original manufacturer or authorized distributors?
All BZW04-171B 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 BZW04-171B meets industry standards.
7.What is the process for return or replacement of BZW04-171B?
All BZW04-171B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-171B, 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 BZW04-171B part is unused and in its original packaging.
Return procedure for BZW04-171B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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