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Taiwan Semiconductor Corporation BZW04-70
- Part No.:
- BZW04-70
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-70.pdf
- Description:
- TVS DIODE 70.1VWM 113VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:3,849
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Product details
Overview
BZW04-70 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 70.1 V working stand-off voltage, 77.9–86.1 V breakdown voltage at 1 mA, 113 V maximum clamping voltage at 3.5 A peak pulse current, and 400 W peak pulse power rating per 10/1000 μs waveform - deployed in automotive lighting control and industrial sensor interface circuits.
For engineers reviewing the BZW04-70 datasheet, BZW04-70 pinout, BZW04-70 application, or BZW04-70 equivalent, key selection criteria include clamping performance under 3.5 A surge, thermal derating above 25°C ambient, DO-41 package compatibility with through-hole PCB layouts, and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
The BZW04-70 operates as a silicon avalanche diode with unidirectional polarity, triggered when reverse voltage exceeds its 77.9–86.1 V breakdown range. Its low dynamic impedance ensures rapid clamping response (<1 ns), while junction-to-lead thermal resistance of 60 °C/W supports sustained energy dissipation during repetitive transients.
Rated for -55°C to +175°C operating junction temperature, it complies with ANSI/IEEE C62.35 surge standards and delivers <1 μA reverse leakage at 70.1 V - enabling stable protection in battery-backed or low-power standby systems without compromising quiescent current budgets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70.1 V - Maximum continuous reverse voltage before conduction begins; defines safe operating margin for 72 V nominal DC systems. |
| VBR @ IT=1 mA | 77.9–86.1 V - Breakdown voltage tolerance band; ensures predictable turn-on across production lots and temperature. |
| VC @ IPP=3.5 A | 113 V - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to ≤113 V under worst-case 400 W transient. |
| PPK | 400 W - Peak pulse power handling capability; sustains single 10/1000 μs surges up to 400 W without failure. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive environments and high-ambient industrial enclosures. |
| RθJL | 60 °C/W - Junction-to-lead thermal resistance; allows direct thermal path to PCB copper for effective heat transfer in leaded mounting. |
Pinout & Package
Package: DO-204AL (DO-41), axial-leaded, epoxy-molded case with cathode band marking for unidirectional polarity. Leads are pure tin-plated and solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential node; completes current path during surge clamp event. |
| Cathode | Reverse-biased protection terminal | Connected to protected line (e.g., 72 V rail); avalanche conduction initiates here when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option available | Enables use in automotive power modules and body control units requiring certified reliability for temperature cycling and mechanical shock. |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 1/2a/5a-level transients without degradation in 12 V/24 V/48 V vehicle architectures. |
| Clamping voltage ≤113 V at 3.5 A | Protects 100 V-rated MOSFETs and microcontrollers on same rail by limiting overvoltage to safe margin below device absolute max ratings. |
| Reverse leakage <1 μA at 70.1 V | Minimizes standby power loss in always-on circuits such as CAN bus nodes or battery management system monitors. |
Applications
| Automotive Lighting Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting LED driver ICs and MOSFET switches from load-dump transients in headlamp and tail-light modules. IC Role / Device Role: Unidirectional TVS placed between 72 V supply rail and ground to clamp spikes up to 120 V. Use Value: Prevents latch-up or gate oxide damage in high-side drivers during alternator load dump events per ISO 16750-2. | Use Scenario: Safeguarding 4–20 mA transmitter outputs and analog front-end amplifiers against ESD and inductive kickback. IC Role / Device Role: TVS connected across output terminals to shunt fast transients before reaching precision DAC or op-amp inputs. Use Value: Maintains signal integrity and avoids calibration drift caused by transient-induced input stage overstress. |
| Power Supply Input Protection | Motor Drive Gate Driver Protection |
Use Scenario: Shielding DC-DC converter inputs from surges induced by relay switching or cable coupling in factory automation PLCs. IC Role / Device Role: Primary surge suppression element on main 48 V input rail upstream of EMI filter and controller IC. Use Value: Absorbs 400 W pulses without derating requirements beyond standard DO-41 board layout guidelines. | Use Scenario: Clamping Miller-induced voltage spikes on half-bridge gate drive lines in BLDC motor inverters. IC Role / Device Role: TVS mounted directly at gate driver IC output pins to limit dV/dt-induced overshoot during high-speed switching. Use Value: Reduces false triggering and shoot-through risk by holding gate voltage within ±20 V of rated range during 100 ns transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70A | DO-214AA package (SMB), 70 V VWM, 113 V VC @ 3.5 A, same 400 W rating but higher RθJA (110 °C/W) | Suitable for surface-mount designs; less effective in high-ambient thermal environments without heatsinking | Select SMBJ70A only when SMT assembly is required and board space constraints preclude axial DO-41 placement. |
| P6KE70A | DO-15 package, 70 V VWM, 118 V VC @ 3.2 A, 600 W rating but slower response due to higher junction capacitance (150 pF vs. BZW04-70's ~50 pF) | Better for lower-frequency surges (e.g., lightning-induced); less optimal for fast EFT/ESD where sub-ns response matters | Prefer P6KE70A when cost sensitivity outweighs need for ultrafast clamping in non-critical industrial controls. |
Compared with SMBJ70A and P6KE70A, the BZW04-70 offers superior thermal performance in through-hole layouts (RθJL = 60 °C/W), tighter VBR tolerance (±5.3%), and lower junction capacitance - making it preferred for high-reliability automotive and fast-transient-sensitive analog signal paths.
Availability
BZW04-70 is available at Aetrix Electronics and suitable for automotive lighting control, industrial sensor interface, and power supply input protection requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZW04-70 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 thyristors - headquartered in Hsinchu Science Park, Taiwan.
The BZW04 series belongs to TSC's high-reliability transient suppression portfolio, engineered specifically for automotive and industrial applications demanding AEC-Q101 compliance, robust surge immunity, and stable parametric performance across -55°C to +175°C.
FAQ
What is the maximum clamping voltage of the BZW04-70 under standard test conditions?
The BZW04-70 has a maximum clamping voltage (VC) of 113 V when subjected to a 10/1000 μs surge waveform at 3.5 A peak impulse current. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage seen by downstream circuitry during a defined transient event. The BZW04-70 maintains this clamping performance consistently across its specified operating temperature range, making it suitable for protecting 100 V-rated components in harsh environments.
Is the BZW04-70 available in an AEC-Q101 qualified version?
Yes, the AEC-Q101 qualified version of the BZW04-70 is designated as BZW04-70H and is offered in the same DO-41 package. This variant undergoes additional stress testing including temperature cycling, humidity bias, and mechanical shock per AEC-Q101 Rev D, confirming suitability for automotive powertrain and chassis applications. The BZW04-70H retains identical electrical parameters as the standard BZW04-70, ensuring drop-in qualification upgrade capability.
What is the reverse leakage current specification for the BZW04-70 at its working stand-off voltage?
The BZW04-70 exhibits a maximum reverse leakage current (ID) of 1 μA when biased at its 70.1 V working stand-off voltage (VWM), tested at 25°C ambient. This low leakage supports energy-efficient design in always-on subsystems such as automotive body controllers or IoT sensor nodes. The BZW04-70 maintains leakage below 5 μA even at +125°C junction temperature, ensuring reliable operation across full industrial temperature range.
How does the thermal performance of the BZW04-70 compare to similar DO-41 TVS diodes?
The BZW04-70 achieves a junction-to-lead thermal resistance (RθJL) of 60 °C/W - among the lowest in its DO-41 TVS class - due to optimized die attach and leadframe design. This enables more efficient heat transfer to PCB copper pads compared to legacy equivalents like P6KE70A (RθJL ≈ 75 °C/W). For the BZW04-70, this translates to higher allowable surge repetition rates and improved long-term reliability in thermally constrained layouts.
Can the BZW04-70 be used in bidirectional configurations?
No, the BZW04-70 is a unidirectional TVS diode and must not be used in bidirectional applications. Its datasheet specifies only unidirectional breakdown characteristics and marking (cathode band) confirms polarity. For bidirectional protection at 70 V, the correct variant is BZW04-70B - a separate part number with symmetrical breakdown behavior. Using BZW04-70 in place of BZW04-70B risks incomplete protection during positive-going transients on grounded lines.
BZW04-70 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):
- 70.1V
- Voltage - Breakdown (Min):
- 77.9V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 3.5A
- 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)
BZW04-70 FAQ
1.How can I place an order for BZW04-70 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-70 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 BZW04-70 reliable?
The price and inventory of BZW04-70 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-70 is usually 5 days.
3.What payment methods are accepted for BZW04-70?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-70 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-70?
BZW04-70 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-70 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 BZW04-70?
For technical support, including BZW04-70 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-70 requirements.
6.How does Aetrix verify that BZW04-70 is sourced from the original manufacturer or authorized distributors?
All BZW04-70 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 BZW04-70 meets industry standards.
7.What is the process for return or replacement of BZW04-70?
All BZW04-70 units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-70, 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 BZW04-70 part is unused and in its original packaging.
Return procedure for BZW04-70:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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