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Taiwan Semiconductor Corporation BZW04-273B
- Part No.:
- BZW04-273B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-273B.pdf
- Description:
- TVS DIODE 273VWM 438VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,130
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Product details
Overview
BZW04-273B 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 273 V working stand-off voltage (VWM), 304–336 V breakdown voltage (VBR) at 1 mA, 438 V maximum clamping voltage (VC) at 0.9 A peak pulse current, and 400 W peak pulse power rating at 10/1000 μs waveform - deployed in automotive lighting control and industrial sensor interface circuits.
For engineers reviewing the BZW04-273B datasheet, BZW04-273B pinout, BZW04-273B application, or BZW04-273B equivalent, key selection criteria include clamping performance under 0.9 A surge, thermal derating above 25°C ambient, DO-41 package compatibility with manual or wave-soldered PCB layouts, and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
The BZW04-273B operates as a unidirectional avalanche diode, triggering conduction when reverse voltage exceeds its 304–336 V breakdown range. Its low dynamic impedance ensures rapid clamping response (<1 ns typical), limiting transient energy delivered to downstream ICs during EFT or load-dump events.
Thermal design relies on junction-to-lead resistance of 60 °C/W and junction-to-ambient resistance of 100 °C/W on standard PCB pads. It sustains 1 W steady-state dissipation at 75°C lead temperature and supports 40 A non-repetitive forward surge current per 8.3 ms half-sine waveform.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 273 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC rail margin. |
| VBR @ 1 mA | 304–336 V - Measured breakdown range confirming device activation threshold under standardized test current. |
| VC @ IPP = 0.9 A | 438 V - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on protected circuitry. |
| PPK | 400 W - Peak pulse power handling capability; validates robustness against ISO 7637-2 Pulse 5a load-dump transients. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| RθJL | 60 °C/W - Junction-to-lead thermal resistance; informs heatsinking requirements for sustained surge duty cycles. |
| Package | DO-204AL (DO-41) - Axial-leaded through-hole package with 0.300 g mass; compatible with legacy industrial assembly lines. |
Pinout & Package
DO-204AL (DO-41) axial package with cathode 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 | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V supply rail); marked by band; conducts during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified variant available | Validated for automotive applications including engine control modules and body electronics requiring extended temperature and reliability compliance. |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 5a load-dump surges up to 438 V clamping without failure or parameter shift. |
| Low IR < 1 μA @ VWM | Minimizes standby power loss and avoids false triggering in high-impedance sensing circuits. |
| Fast response time (<1 ns) | Clamps transients before sensitive logic or analog front-ends experience destructive overvoltage stress. |
| RoHS & halogen-free | Complies with IEC 61249-2-21; suitable for environmentally regulated industrial and automotive production programs. |
Applications
| Automotive Lighting Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting LED driver ICs from load-dump transients during vehicle battery disconnect/reconnect events. IC Role / Device Role: Unidirectional TVS placed between 24 V supply rail and ground to clamp surges exceeding 273 V. Use Value: Limits clamped voltage to 438 V, preventing damage to 45 V-rated buck controllers and gate drivers in headlight modules. |
Use Scenario: Safeguarding 4–20 mA current-loop transmitters from ESD and inductive switching spikes in factory automation. IC Role / Device Role: TVS connected across loop supply terminals to absorb fast transients induced by relay coil de-energization. Use Value: Sub-1 ns response ensures clamping occurs before 24 V loop-supply ICs exceed absolute maximum ratings. |
| Power Supply Input Protection | Communication Port Surge Suppression |
Use Scenario: Front-end protection for AC/DC adapter secondary-side DC outputs exposed to conducted surges. IC Role / Device Role: Standoff-rated TVS absorbing 400 W pulses on 273 V nominal output rails. Use Value: Enables compliance with IEC 61000-4-5 Level 3 (2 kV line-earth) without additional series impedance. |
Use Scenario: Transient suppression on RS-485 bus lines in building management systems subject to lightning-induced surges. IC Role / Device Role: Unidirectional TVS placed between differential pair and ground to limit common-mode overvoltage. Use Value: Maintains signal integrity by clamping only during overvoltage, with <1 μA leakage preserving bus bias stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ270A | Same DO-214AC (SMA) package; 270 V VWM; 400 W PPK; VC = 438 V @ 0.9 A; higher junction capacitance (100 pF vs. ~30 pF). | Suitable for surface-mount designs; less optimal for high-frequency signal lines due to higher CJ. | Select SMAJ270A only if SMT layout and thermal profile support SMA footprint and lower RθJA. |
| Vishay 1.5KE270A | DO-201AD package; 270 V VWM; 1500 W PPK; VC = 438 V @ 3.4 A; larger size (7.1 × 5.3 mm vs. DO-41's 5.2 × 2.7 mm). | Higher surge capacity but requires more board space; not AEC-Q101 qualified. | Choose 1.5KE270A where multi-pulse robustness outweighs size constraints and automotive qualification is not required. |
Compared with SMAJ270A and 1.5KE270A, the BZW04-273B offers DO-41 through-hole compatibility, AEC-Q101 option, and optimized thermal resistance for lead-soldered industrial assemblies - making it preferred for legacy automotive harness interfaces and repairable power modules.
Availability
BZW04-273B is available at Aetrix Electronics and suitable for automotive lighting control, industrial sensor interface, and power supply input protection requiring stable component supply across long-lifecycle programs.
Supply support for BZW04-273B 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 industrial and automotive markets.
The BZW04 series was engineered specifically for high-reliability transient suppression in harsh-environment applications - emphasizing tight VBR tolerance, AEC-Q101 qualification, and consistent clamping performance across temperature.
FAQ
What is the polarity configuration of the BZW04-273B?
The BZW04-273B is a unidirectional TVS diode with cathode band marking indicating the clamping terminal. When reverse-biased (cathode at higher potential), it avalanches above 304–336 V to shunt surge current to ground. Forward conduction occurs at ~0.7 V like a standard silicon diode. This polarity must be observed during PCB placement to ensure correct protection orientation in the BZW04-273B circuit.
Is the BZW04-273B AEC-Q101 qualified?
The BZW04-273B itself is not automatically AEC-Q101 qualified; qualification applies only to variants marked with "H" suffix (e.g., BZW04-273BH). The base BZW04-273B meets all electrical and mechanical specifications in the datasheet but lacks the extended reliability testing required for automotive use. For automotive applications, specify BZW04-273BH to ensure full AEC-Q101 compliance in the BZW04-273B procurement process.
What is the maximum clamping voltage of the BZW04-273B under surge conditions?
The BZW04-273B has a maximum clamping voltage (VC) of 438 V when subjected to a 0.9 A peak pulse current with a 10/1000 μs waveform. This value is measured at TA = 25°C and represents the upper limit of voltage seen by protected circuitry during worst-case surge events. Designers must verify that downstream components have voltage ratings exceeding 438 V to ensure reliable operation of the BZW04-273B protection scheme.
How does the BZW04-273B compare to bidirectional TVS diodes?
The BZW04-273B is unidirectional and intended for DC line protection where polarity is fixed - such as 24 V supply rails or grounded-signal interfaces. Unlike bidirectional variants (e.g., BZW04-273BB), it does not conduct symmetrically for both polarities. Its lower leakage (<1 μA @ 273 V) and tighter VBR tolerance make it preferable for precision DC applications, whereas bidirectional types suit AC-coupled or floating signal lines. Selecting BZW04-273B over bidirectional versions avoids unnecessary leakage in polarized systems.
What is the thermal derating behavior of the BZW04-273B above 25°C ambient?
The BZW04-273B follows a linear derating curve: peak pulse power decreases from 400 W at 25°C to zero at 175°C junction temperature. At 75°C ambient, the steady-state power dissipation is rated at 1 W with 9.5 mm lead length on 5 × 5 mm copper pads. Engineers must apply the derating factor from Figure 2 in the datasheet when sizing heatsinking or estimating safe surge repetition rates for the BZW04-273B in elevated-temperature enclosures.
BZW04-273B 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):
- 273V
- Voltage - Breakdown (Min):
- 304V
- Voltage - Clamping (Max) @ Ipp:
- 438V
- Current - Peak Pulse (10/1000µs):
- 900mA
- 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)
BZW04-273B FAQ
1.How can I place an order for BZW04-273B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-273B 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 BZW04-273B reliable?
The price and inventory of BZW04-273B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-273B is usually 5 days.
3.What payment methods are accepted for BZW04-273B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-273B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-273B?
BZW04-273B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-273B 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 BZW04-273B?
For technical support, including BZW04-273B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-273B requirements.
6.How does Aetrix verify that BZW04-273B is sourced from the original manufacturer or authorized distributors?
All BZW04-273B 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 BZW04-273B meets industry standards.
7.What is the process for return or replacement of BZW04-273B?
All BZW04-273B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-273B, 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 BZW04-273B part is unused and in its original packaging.
Return procedure for BZW04-273B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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