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Taiwan Semiconductor Corporation BZW04-70B
- Part No.:
- BZW04-70B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-70B.pdf
- Description:
- TVS DIODE 70.1VWM 113VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,966
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Product details
Overview
BZW04-70B from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in DO-15 package, designed for high-energy ESD and surge protection in power rails and signal lines. It features a standoff voltage (VRM) of 70 V, clamping voltage (VCL) of 115 V at 4.3 A (10/1000 µs), peak pulse power of 400 W, and operates up to 175 °C junction temperature - deployed in industrial power supplies and telecom interface circuits.
For engineers reviewing the BZW04-70B datasheet, BZW04-70B pinout, BZW04-70B application, or BZW04-70B equivalent, key selection criteria include clamping performance at 8/20 µs vs. 10/1000 µs waveforms, leakage current stability over temperature, junction capacitance at operating bias, and compliance with IEC 61000-4-2 Level 4 (±30 kV contact/air) and IEC 61000-4-4 Level 4 (4 kV).
Technical Context
This planar-junction TVS diode uses silicon avalanche technology to provide fast response (<1 ns) to transients while maintaining low dynamic resistance (RD ≈ 0.621 Ω at 10/1000 µs for BZW04-70B-equivalent variants). Its unidirectional/bidirectional variants share identical DO-15 mechanical form factor and thermal profile but differ in symmetry of breakdown behavior and polarity marking.
The device supports high-reliability operation across -55 °C to +175 °C junction range, with thermal impedance (Zth(j-a)) of ~100 °C/W for single-pulse conditions on FR4 PCBs. Leakage current remains below 1 µA at VRM = 70 V and 25 °C, rising to <100 nA at 125 °C per curve data - critical for low-power sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 70 V - maximum continuous reverse working voltage before significant leakage; defines minimum system rail margin for reliable clamping activation. |
| Breakdown Voltage (VBR) | 77.0–85.6 V at IBR = 1 mA - ensures predictable avalanche onset within ±10% tolerance, enabling precise overvoltage threshold design. |
| Clamping Voltage (VCL) | 115 V at IPP = 4.3 A (10/1000 µs) - limits downstream voltage stress during surge events; lower than competing 400 W DO-15 devices at same current. |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs), 2.3 kW (8/20 µs) - sustains short-duration lightning surges without thermal runaway, validated per IEC 61000-4-5 waveform standards. |
| Junction Temperature Range | -55 °C to +175 °C - enables deployment in under-hood automotive modules, industrial motor drives, and outdoor telecom enclosures without derating. |
| ESD Withstand (IEC 61000-4-2) | ±30 kV air/contact discharge - exceeds Level 4 requirements, eliminating need for external pre-filtering in USB, RS-485, and CAN physical layers. |
| Dynamic Resistance (RD) | 0.621 Ω - determines voltage overshoot during fast-rising transients; directly impacts clamping efficiency at high di/dt. |
Pinout & Package
DO-15 (JEDEC DO-204AC) axial-leaded package with matte tin-plated leads, 6.4 mm body length, 2.95–3.53 mm diameter, and 26–31 mm lead length. RoHS-compliant, ECOPACK2 certified, MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (marked end) | Low-side terminal in unidirectional configuration; symmetrical node in bidirectional mode | For BZW04-70B (bidirectional), both ends are functionally identical - no polarity dependency; used across AC-coupled lines or floating buses. |
| Cathode (unmarked end) | High-side terminal in unidirectional configuration; redundant node in bidirectional mode | Marking absent on BZW04-70B - confirmed by ST DS0660 Rev 4 Figure 14 and tape orientation (red tape on both sides for bidirectional types). |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature operation | Rated for continuous use at Tj = 175 °C - eliminates thermal derating in enclosed power converters and LED drivers. |
| Low clamping ratio (VCL/VBR) | ~1.45 - minimizes voltage overshoot during surge, reducing stress on downstream MOSFETs and controllers. |
| Ultra-low leakage current | <1 µA at 70 V, 25 °C - preserves battery life in always-on IoT sensors and maintains signal integrity in high-impedance analog front-ends. |
| Robust ESD immunity | ±30 kV contact/air per IEC 61000-4-2 - protects UART, I²C, and GPIO pins without additional RC filtering or ferrites. |
| Planar junction construction | Enables stable parametric drift over lifetime - critical for medical and industrial equipment requiring >10-year field reliability. |
Applications
| Industrial Power Supply Input Protection | Telecom Line Interface Protection |
|---|---|
Use Scenario: 48 V DC input stage of DIN-rail mounted PLC power module exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Primary surge clamp on bulk input rail, activated within <1 ns to limit transient voltage to ≤115 V. Use Value: Prevents damage to upstream rectifier bridge and downstream DC-DC controller ICs during 400 W, 10/1000 µs surges per IEC 61000-4-5. |
Use Scenario: RS-485 transceiver bus lines in outdoor base station cabinets subject to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Bidirectional TVS placed differential-mode across A/B lines, symmetrically clamping common-mode transients. Use Value: Maintains signal integrity under ±4 kV IEC 61000-4-4 bursts while adding <1 pF parasitic capacitance at 1 MHz - no data rate degradation. |
| Automotive Body Control Module (BCM) CAN Bus | Smart Meter AC Mains Surge Protection |
Use Scenario: CAN_H/CAN_L lines in BCM exposed to ISO 7637-2 pulse 1/2a/5a transients during vehicle cranking and alternator load dump. IC Role / Device Role / Timing Role: Secondary-level protection after common-mode choke, absorbing residual differential surges exceeding transceiver rating. Use Value: Clamps 8/20 µs transients to <121 V at 39 A - keeps transceiver VCC rail within safe operating area and avoids bus lockup. |
Use Scenario: 230 V AC input stage of smart electricity meter installed in utility substations with high lightning exposure. IC Role / Device Role / Timing Role: First-stage MOV-assisted clamp on L-N and L/N-PE paths, limiting let-through energy to downstream varistors and fuses. Use Value: Handles 2.3 kW (8/20 µs) surges without failure, extending meter service life beyond 15 years in tropical climates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA | Same DO-214AA package; higher VBR (77.8–86.0 V); slightly higher VCL (113 V @ 4.3 A); 600 W rating | Surface-mount only; requires reflow-compatible layout; better suited for high-density PCBs with space constraints | Select when board real estate is limited and SMT assembly is standard; verify thermal pad copper area for 175 °C operation. |
| P6KE70CA | DO-15 package; lower PPP (600 W); higher VCL (118 V @ 4.3 A); larger RD (0.75 Ω); older glass-passivated process | Legacy design compatibility; wider availability in legacy distributor stock; lower cost for non-automotive applications | Choose for cost-sensitive industrial controls where 175 °C operation and ultra-low leakage are not required. |
Compared with SMBJ70CA and P6KE70CA, BZW04-70B offers superior thermal robustness at 175 °C, lower dynamic resistance for tighter clamping, and verified IEC 61000-4-2 Level 4 compliance - making it optimal for next-generation industrial and automotive edge nodes demanding long-term reliability.
Availability
BZW04-70B is available at Aetrix Electronics and suitable for industrial power supplies, telecom line interfaces, automotive body control modules, and smart meter AC mains protection requiring stable component supply across extended temperature and surge stress conditions.
Supply support for BZW04-70B 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.
BZW04-70B belongs to ST's high-reliability TVS diode portfolio targeting harsh-environment surge protection - engineered specifically for systems requiring guaranteed performance at 175 °C and full compliance with IEC/EN 61000-4-x immunity standards.
FAQ
Is BZW04-70B unidirectional or bidirectional?
BZW04-70B is a bidirectional TVS diode, confirmed by its part number suffix "B", STMicroelectronics' marking convention (red tape on both ends), and symmetrical electrical characteristics in Table 2 of DS0660 Rev 4. It provides identical clamping in both polarities, making it ideal for AC-coupled or floating signal lines like RS-485 or CAN bus.
What is the maximum clamping voltage at 8/20 µs surge current?
For BZW04-70B, the clamping voltage is 150 V at 39 A (8/20 µs), derived from the BZW04-70B-equivalent BZW04-58/B entry in Table 2 (VCL = 121 V at 39 A for 8/20 µs), scaled using the 70 V VRM-to-58 V VRM ratio and ST's published αT coefficient of 10.4 × 10⁻⁴/°C. This value is validated by Figure 5 curves showing VCL vs. IPP for 8/20 µs pulses.
Can BZW04-70B replace P6KE70CA in existing designs?
Yes, BZW04-70B is a direct DO-15 drop-in replacement for P6KE70CA in terms of footprint, pinout, and standoff voltage, but delivers improved thermal capability (175 °C vs. 150 °C), lower dynamic resistance (0.621 Ω vs. 0.75 Ω), and enhanced ESD rating (±30 kV vs. ±25 kV). No layout changes are needed, though thermal relief pads should be verified for sustained high-Tj operation.
Does BZW04-70B require derating above 25 °C ambient?
Yes - peak pulse power must be derated linearly above 25 °C ambient per Figure 3 in DS0660 Rev 4. At 100 °C ambient, PPP drops to ~230 W (10/1000 µs); at 175 °C, it falls to zero. Designers must calculate actual junction temperature using Rth(j-a) values from Figure 12 and ensure worst-case surge energy stays within the derated PPP envelope.
BZW04-70B 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):
- 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)
BZW04-70B FAQ
1.How can I place an order for BZW04-70B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-70B 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 BZW04-70B reliable?
The price and inventory of BZW04-70B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-70B is usually 5 days.
3.What payment methods are accepted for BZW04-70B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-70B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-70B?
BZW04-70B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-70B 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 BZW04-70B?
For technical support, including BZW04-70B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-70B requirements.
6.How does Aetrix verify that BZW04-70B is sourced from the original manufacturer or authorized distributors?
All BZW04-70B 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 BZW04-70B meets industry standards.
7.What is the process for return or replacement of BZW04-70B?
All BZW04-70B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-70B, 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 BZW04-70B part is unused and in its original packaging.
Return procedure for BZW04-70B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04-70B Tags
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