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Taiwan Semiconductor Corporation BZW04-273
- Part No.:
- BZW04-273
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-273.pdf
- Description:
- TVS DIODE 273VWM 438VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,829
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Product details
Overview
BZW04-273 from Taiwan Semiconductor is a unidirectional transient voltage suppressor diode (TVS) designed for high-energy surge clamping in DC power rails and signal lines. It features a 273 V working stand-off voltage (VWM), 304–336 V breakdown voltage (VBR @ 1 mA), 438 V maximum clamping voltage at 0.9 A peak impulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive lighting control modules and industrial PLC I/O protection.
For engineers reviewing the BZW04-273 datasheet, BZW04-273 pinout, BZW04-273 application, or BZW04-273 equivalent, key selection criteria include clamping voltage margin vs. system rail, unidirectional polarity alignment with DC bias, DO-41 package thermal derating above 25°C, and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
The BZW04-273 operates as a silicon avalanche diode optimized for fast-response transient suppression. Its junction structure delivers sub-nanosecond response time and low dynamic impedance during 10/1000 µs surges, enabling effective clamping of EFT and load-dump transients without thermal runaway under repetitive stress.
It is rated for -55°C to +175°C operating junction temperature, with 60°C/W junction-to-lead thermal resistance and 100°C/W junction-to-ambient resistance on standard PCB pads. The device exhibits 0.110%/°C VBR temperature coefficient and <1 µA reverse leakage at 273 V, ensuring stable off-state behavior in high-impedance monitoring circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 273 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR @ IT=1 mA | 304–336 V - Breakdown threshold range defining reliable avalanche initiation point |
| VC @ IPP = 0.9 A | 438 V - Clamped voltage during 10/1000 µs surge, limiting downstream component stress |
| PPK | 400 W - Peak pulse power handling capability per standardized surge waveform |
| TJ max | +175°C - Maximum junction temperature supporting operation in under-hood automotive environments |
| RθJL | 60°C/W - Thermal resistance from junction to lead, critical for solder-joint reliability in high-power pulses |
| ID @ VWM | ≤1 µA - Reverse leakage current ensuring minimal standby power loss in battery-backed systems |
Pinout & Package
Package: DO-204AL (DO-41), axial-leaded, epoxy-molded case with cathode band marking for unidirectional polarity. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or lowest potential node in unidirectional clamp configuration |
| Cathode | High-side surge input terminal | Connected to protected line; avalanche conduction occurs when voltage exceeds VBR relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option available | BZW04-273H variant meets automotive stress test requirements for temperature cycling, HTRB, and ESD |
| 400 W peak pulse power (10/1000 µs) | Enables single-device protection against ISO 7637-2 Pulse 5a (load dump) up to 273 V system rails |
| Clamping ratio VC/VBR ≈ 1.34 | Indicates tight voltage regulation during surge, minimizing overvoltage margin needed for downstream ICs |
| 0.110%/°C VBR tempco | Ensures predictable breakdown shift across automotive temperature range, simplifying worst-case design margining |
| DO-41 package with pure tin leads | Supports lead-free reflow and wave soldering per J-STD-002; compatible with legacy through-hole assembly |
Applications
| Automotive Lighting Control | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting microcontroller GPIO and driver ICs in LED headlamp modules subjected to load-dump transients up to 120 V. IC Role / Device Role: Unidirectional TVS placed between supply rail and ground to clamp positive-going surges before they reach logic-level components. Use Value: With 438 V clamping at 0.9 A and 273 V VWM, BZW04-273 provides >30% margin above 36 V nominal vehicle system voltage while surviving repeated 400 W pulses. |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers exposed to inductive kickback from solenoid valves. IC Role / Device Role: Standoff diode connected anode-to-ground, cathode-to-input line to shunt negative transients and clamp positive spikes. Use Value: Sub-1 µA leakage at 273 V ensures no false triggering on high-impedance optocoupler inputs; DO-41 footprint allows direct replacement of legacy 1N53xx series. |
| Power Supply Overvoltage Clamp | ESD-Protected Sensor Interface |
Use Scenario: Secondary-side overvoltage protection in isolated DC-DC converters where output rail must not exceed 273 V during fault conditions. IC Role / Device Role: Precision clamping element across output capacitor to limit voltage excursion during feedback loop failure or transformer saturation. Use Value: Tight 304–336 V VBR tolerance and 0.110%/°C tempco enable accurate, temperature-stable trip point without external sensing circuitry. |
Use Scenario: Front-end protection for analog sensor signals (e.g., pressure transducers) routed through long cables in factory automation environments. IC Role / Device Role: Low-capacitance unidirectional TVS placed between signal line and ground to absorb ESD events while preserving signal integrity. Use Value: Junction capacitance below 100 pF at zero bias (per Fig.7) minimizes high-frequency attenuation; 438 V clamping prevents latch-up in 3.3 V/5 V ADC front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ270A | DO-214AA package; 270 V VWM; 400 W rating; higher VC = 435 V @ 0.91 A | Surface-mount alternative requiring PCB redesign; lower thermal resistance (RθJA = 50°C/W) | Select when board space is constrained and SMT assembly is preferred; verify layout clearance for 435 V clamping. |
| 1.5KE270A | DO-201AD package; same 273 V VWM range; 1500 W rating; larger footprint and higher VC = 438 V @ 3.4 A | Higher energy handling but slower response; less suitable for fast EFT immunity | Choose only for legacy through-hole designs needing >400 W surge margin; avoid where EFT immunity <5 ns response required. |
Compared with SMBJ270A and 1.5KE270A, the BZW04-273 offers identical clamping performance in a smaller DO-41 form factor with AEC-Q101 qualification path, making it optimal for new automotive and industrial through-hole designs prioritizing reliability and thermal robustness.
Availability
BZW04-273 is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and DC power supply overvoltage clamping requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for BZW04-273 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability power devices and protection components.
The BZW04 series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 compliance, tight VBR tolerances, and robust thermal performance in axial-leaded packages for demanding under-hood and factory-floor environments.
FAQ
What is the polarity configuration of the BZW04-273?
The BZW04-273 is a unidirectional TVS diode, with cathode marked by a band on the DO-41 package. It conducts only during positive voltage transients relative to its anode, making it suitable for DC rail clamping where polarity is fixed. This differs from bidirectional variants like BZW04-273B, which suppress both polarities without requiring external polarity alignment.
Does the BZW04-273 meet AEC-Q101 qualification?
The base BZW04-273 is not AEC-Q101 qualified; however, the BZW04-273H variant - indicated by the "H" suffix in the ordering code - undergoes full AEC-Q101 stress testing including temperature cycling, high-temperature reverse bias, and ESD. Always specify BZW04-273H for automotive applications requiring certified reliability.
What is the maximum clamping voltage of the BZW04-273 under surge conditions?
The BZW04-273 has a maximum clamping voltage (VC) of 438 V when subjected to a 10/1000 µs surge waveform with a peak impulse current (IPP) of 0.9 A. This value is measured per ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuitry during transient events.
How does the BZW04-273 compare to the 1.5KE270A in terms of thermal performance?
The BZW04-273 has a junction-to-lead thermal resistance (RθJL) of 60°C/W and junction-to-ambient (RθJA) of 100°C/W on standard PCB pads, whereas the 1.5KE270A offers RθJA ≈ 65°C/W due to its larger DO-201AD package. While the 1.5KE270A handles higher total energy, the BZW04-273 provides superior thermal coupling to leads for rapid pulse dissipation in compact layouts.
Can the BZW04-273 be used in bidirectional signal line protection?
No - the BZW04-273 is unidirectional and unsuitable for AC or bidirectional signal lines without external circuitry. For such applications, use the pin-compatible BZW04-273B variant, which features symmetrical breakdown characteristics and clamps both positive and negative transients without polarity dependency.
BZW04-273 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):
- 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)
BZW04-273 FAQ
1.How can I place an order for BZW04-273 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-273 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 BZW04-273 reliable?
The price and inventory of BZW04-273 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-273 is usually 5 days.
3.What payment methods are accepted for BZW04-273?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-273 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-273?
BZW04-273 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-273 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 BZW04-273?
For technical support, including BZW04-273 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-273 requirements.
6.How does Aetrix verify that BZW04-273 is sourced from the original manufacturer or authorized distributors?
All BZW04-273 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 BZW04-273 meets industry standards.
7.What is the process for return or replacement of BZW04-273?
All BZW04-273 units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-273, 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 BZW04-273 part is unused and in its original packaging.
Return procedure for BZW04-273:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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