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Taiwan Semiconductor Corporation BZW04-26B
- Part No.:
- BZW04-26B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-26B.pdf
- Description:
- TVS DIODE 25.6VWM 41.5VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,563
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Product details
Overview
BZW04-26B from Taiwan Semiconductor is a bidirectional transient voltage suppressor diode (TVS) designed for high-energy surge protection in automotive and industrial power rails. It features a 25.6 V working stand-off voltage, 28.5–31.5 V breakdown voltage at 1 mA, 41.5 V maximum clamping voltage at 9.6 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed to safeguard CAN transceivers and microcontroller I/O against ESD and load dump.
For engineers reviewing the BZW04-26B datasheet, BZW04-26B pinout, BZW04-26B application, or BZW04-26B equivalent, key selection criteria include unidirectional/bidirectional polarity configuration, DO-41 package thermal derating above 25°C, clamping voltage margin relative to protected IC VDD, and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
The BZW04-26B operates as a silicon avalanche diode with symmetrical bidirectional conduction, enabling suppression of both positive and negative transients without external polarity orientation. Its low dynamic impedance ensures rapid clamping response (<1 ns), while the 0.097 %/°C temperature coefficient of VBR maintains stable breakdown across –55°C to +175°C junction temperatures.
Designed for single-pulse surge immunity per IEC 61000-4-5 (10/1000 µs) and IEC 61000-4-2 ESD events, it delivers 9.6 A peak impulse current capability with <1 µA reverse leakage at 25.6 V - supporting robust protection in 24 V automotive subsystems and industrial PLC analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 25.6 V - Maximum continuous DC or RMS voltage before clamping initiates; sets upper limit for safe operation in 24 V systems. |
| VBR (min/max) | 28.5 V / 31.5 V @ 1 mA - Confirmed avalanche onset range; defines minimum overvoltage threshold for reliable triggering. |
| VC @ IPP | 41.5 V @ 9.6 A - Clamped voltage during 10/1000 µs surge; determines maximum stress on downstream ICs. |
| PPK | 400 W - Peak pulse power handling per standard waveform; validates suitability for ISO 7637-2 Pulse 1/2a/5a compliance testing. |
| IR @ VWM | <1 µA - Reverse leakage at stand-off voltage; ensures negligible standby current draw in battery-powered circuits. |
| TJ Range | –55°C to +175°C - Extended junction temperature range enables under-hood and motor-control deployment without derating. |
Pinout & Package
Package: DO-204AL (DO-41), axial leaded, glass-passivated silicon junction. Cathode band marking denotes polarity for unidirectional variants; BZW04-26B is bidirectional and marked with part-specific code (e.g., "26B") only - no cathode band required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Surge current entry point (negative transient) | Accepts reverse-polarity surges; forms symmetrical clamping path with Cathode terminal. |
| Cathode (Lead 2) | Surge current entry point (positive transient) | Accepts forward-polarity surges; completes bidirectional conduction path with Anode terminal. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (H-grade option) | Validated for automotive electronics per stress test requirements - supports PPAP documentation for Tier-1 suppliers. |
| 400 W peak pulse power (10/1000 µs) | Withstands ISO 7637-2 Load Dump Pulse 5a (up to 400 W) without degradation - eliminates need for series impedance in many 24 V designs. |
| Clamping voltage ≤41.5 V @ 9.6 A | Provides ≥10 V margin below typical 50 V absolute max rating of 3.3 V/5 V MCU I/O - prevents latch-up or gate oxide damage. |
| RoHS & halogen-free (IEC 61249-2-21) | Complies with EU environmental directives and automotive material restrictions - enables global vehicle program acceptance. |
Applications
| Automotive CAN Bus Protection | Industrial 24 V Sensor Interface |
|---|---|
Use Scenario: Protecting high-speed CAN FD transceivers (e.g., TJA1044) from ESD and coupled transients in body control modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed across CANH–CANL differential pair, clamping common-mode surges before they reach transceiver inputs. Use Value: Maintains signal integrity by limiting differential voltage excursion to <±45 V during 8 kV contact ESD - preserving bit error rate (BER) and bus arbitration timing. | Use Scenario: Safeguarding analog input channels of programmable logic controllers (PLCs) connected to 4–20 mA current-loop sensors in factory automation. IC Role / Device Role / Timing Role: Standoff-connected TVS between sensor return and ground, shunting fast transients induced by nearby motor switching or relay bounce. Use Value: Prevents ADC saturation and firmware lockup by clamping 1 kV/500 A surge to <45 V within 1 ns - ensuring uninterrupted process monitoring. |
| Automotive Lighting Driver Protection | Power Supply Input Surge Suppression |
Use Scenario: Shielding LED driver ICs (e.g., AL8863) from load dump transients in headlamp control units. IC Role / Device Role / Timing Role: Parallel-connected TVS at DC input rail (24 V), absorbing energy from alternator-induced 120 V/400 ms pulses. Use Value: Limits input rail overshoot to 41.5 V during 400 W surge - avoids overvoltage shutdown and enables continued PWM dimming operation. | Use Scenario: Front-end protection for isolated DC/DC converters powering safety-critical microcontrollers in medical equipment. IC Role / Device Role / Timing Role: Primary-side TVS across input terminals, diverting line-to-ground surges before isolation barrier and regulation circuitry. Use Value: Reduces risk of secondary-side overvoltage propagation by clamping 10/1000 µs surges to ≤41.5 V - maintaining SELV compliance and functional safety integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26CA (Bourns) | Same DO-214AA package; 26 V VWM, 41.5 V VC @ 9.6 A, but rated for 600 W peak power and higher IPP (14.3 A). | Higher surge capacity suits 48 V systems; SMBJ26CA's larger footprint requires PCB layout change. | Select when >400 W surge margin is needed and board space allows SMB package. |
| P6KE27CA (ON Semiconductor) | DO-15 package; 27 V VWM, 45.7 V VC @ 8.8 A, 600 W rating - higher clamping voltage and lower IPP than BZW04-26B. | Less precise clamping margin for 3.3 V/5 V interfaces; suitable for non-critical 24 V supply rails only. | Choose for cost-sensitive industrial applications where tighter VC tolerance is not required. |
Compared with SMBJ26CA and P6KE27CA, the BZW04-26B offers optimal balance of clamping precision (41.5 V), DO-41 compatibility, and AEC-Q101 readiness - making it preferred for space-constrained automotive modules requiring validated reliability without footprint redesign.
Availability
BZW04-26B is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC analog I/O modules, and 24 V LED lighting drivers requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZW04-26B 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 Company (TSC) is a vertically integrated Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs since 1979.
The BZW04 series was engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - emphasizing low clamping voltage, high surge robustness, and extended temperature operation.
FAQ
What is the polarity configuration of BZW04-26B?
BZW04-26B is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive- and negative-polarity transients without requiring orientation during PCB placement. Unlike unidirectional variants (e.g., BZW04-26), it has no cathode band marking and functions identically across either lead - ideal for differential signal lines like CAN or RS-485 where polarity reversal must be tolerated. This behavior is confirmed in the device's electrical characteristics table under "Bidirectional" column entries.
Does BZW04-26B meet AEC-Q101 qualification?
BZW04-26B itself is not AEC-Q101 qualified; only the "H" suffix variant (BZW04-26BH) carries that certification. The base BZW04-26B meets all electrical and mechanical specifications in the datasheet but lacks the extended stress-test validation required for automotive grade. For automotive applications requiring PPAP submission or OEM approval, BZW04-26BH must be specified - its ordering code includes the "H" suffix and is explicitly noted in the Ordering Information section of the Taiwan Semiconductor datasheet.
What is the maximum clamping voltage of BZW04-26B and how is it measured?
The maximum clamping voltage of BZW04-26B is 41.5 V, measured at a peak pulse current (IPP) of 9.6 A using the standardized 10/1000 µs double-exponential waveform per IEC 61000-4-5. This value represents the highest voltage observed across the device terminals during surge conduction and is guaranteed across the full operating temperature range. It is not a typical or average value - it is the worst-case limit used for system-level overvoltage margin calculations in protected IC datasheets.
Can BZW04-26B replace BZW04-26 in an existing design?
Yes, BZW04-26B can directly replace BZW04-26 in most designs because both share identical electrical parameters (VWM = 25.6 V, VBR = 28.5–31.5 V, VC = 41.5 V) and DO-41 packaging. The "B" suffix denotes bidirectional functionality, whereas BZW04-26 is unidirectional. Replacement is valid only if the circuit does not rely on polarity-specific conduction - for example, across differential lines or AC-coupled rails. If protecting a DC rail with defined anode/cathode routing, verify conduction directionality before substitution.
What thermal derating applies to BZW04-26B at elevated ambient temperatures?
BZW04-26B's peak pulse power rating of 400 W is specified at TA = 25°C and must be linearly derated above that temperature per Figure 2 in the datasheet: at 75°C ambient, pulse power drops to ~280 W; at 125°C, it falls to ~160 W. This derating stems from junction-to-ambient thermal resistance (RθJA = 100°C/W) and must be accounted for in thermally constrained enclosures or under-hood automotive locations where sustained high ambient temperatures reduce surge margin.
BZW04-26B 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):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 41.5V
- Current - Peak Pulse (10/1000µs):
- 9.6A
- 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)
BZW04-26B FAQ
1.How can I place an order for BZW04-26B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-26B 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 BZW04-26B reliable?
The price and inventory of BZW04-26B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-26B is usually 5 days.
3.What payment methods are accepted for BZW04-26B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-26B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-26B?
BZW04-26B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-26B 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 BZW04-26B?
For technical support, including BZW04-26B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-26B requirements.
6.How does Aetrix verify that BZW04-26B is sourced from the original manufacturer or authorized distributors?
All BZW04-26B 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 BZW04-26B meets industry standards.
7.What is the process for return or replacement of BZW04-26B?
All BZW04-26B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-26B, 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 BZW04-26B part is unused and in its original packaging.
Return procedure for BZW04-26B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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