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Taiwan Semiconductor Corporation SMCJ70
- Part No.:
- SMCJ70
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70.pdf
- Description:
- 1500W, 86.5V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SMCJ70 from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 70V working stand-off voltage (VWM), 77.8–95.1V breakdown voltage (VBR), and 125V maximum clamping voltage (VC) at 12.6A peak pulse current - designed for automotive load-dump and inductive switching protection in power electronics.
For engineers reviewing the SMCJ70 datasheet, SMCJ70 pinout, SMCJ70 application, or SMCJ70 equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature limits (−55°C to +150°C), moisture sensitivity level (MSL 1), and compatibility with automated SMT placement on high-reliability PCBs.
Technical Context
The SMCJ70 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (77.8–95.1V at 1mA test current); it clamps transients to ≤125V within <1.0ps response time, dissipating up to 1500W peak pulse power (tp = 1ms) while maintaining <1μA leakage above 10V.
Thermally, it features RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable operation at TJ ≤ 150°C; its glass-passivated junction and matte tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 77.8 V / 95.1 V @ 1 mA - Ensures consistent avalanche turn-on across production lot |
| VC @ IPPM | 125 V @ 12.6 A - Clamping voltage during 10/1000μs surge defines protected circuit stress level |
| PPK | 1500 W - Peak pulse power handling per ISO 7637-2 compliant transient events |
| TJ max | +150 °C - Maximum junction temperature supports under-hood automotive use |
| IR @ VWM | <1 μA - Ultra-low leakage preserves standby power integrity in always-on systems |
| Package | DO-214AB (SMC) - Standardized surface-mount outline compatible with IPC-7351B land patterns |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with cathode band marking; matte tin-plated leads; weight ≈ 0.210 g; UL 94V-0 rated compound; polarity indicated by cathode band (cathode terminal).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / low-side reference | Connected to system ground or low-voltage rail in unidirectional clamp configuration |
| Cathode | Transient clamping node / high-side input | Connected to protected line (e.g., 12V battery rail); conducts avalanche current during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive electrical system immunity testing without external filtering components |
| Response time <1.0 ps | Clamps EFT and lightning-induced surges before sensitive ICs experience overstress |
| MSL Level 1 per J-STD-020 | Zero floor life limitation - can be stored indefinitely and placed directly into reflow without baking |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive Power Distribution | Industrial Motor Drive Protection |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed ECUs from load dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and ECU input filter stage. Use Value: Clamps 120V+ transients to ≤125V within picoseconds, preventing damage to LDOs, CAN transceivers, and microcontrollers. | Use Scenario: Safeguarding gate drivers and current-sense amplifiers in BLDC motor inverters against inductive kickback. IC Role / Device Role / Timing Role: Parallel-connected TVS on DC bus and phase-leg outputs to absorb flyback energy. Use Value: 1500W peak power rating handles repetitive 8.3ms half-sine surges up to 200A IFSM without degradation. |
| LED Lighting Driver Input Stage | Telecom Power Supply Surge Protection |
Use Scenario: Shielding constant-current LED drivers from mains-coupled surges and ESD events in outdoor signage. IC Role / Device Role / Timing Role: Primary-level TVS on AC/DC rectified output before buck controller input. Use Value: 70V VWM aligns with 48–60V nominal LED string supplies; 125V VC ensures downstream MOSFETs remain within SOA. | Use Scenario: Front-end protection of PoE-powered equipment against induced surges on Ethernet cables and auxiliary DC inputs. IC Role / Device Role / Timing Role: Bidirectional-capable variant (SMCJ70CA) used on isolated DC bias lines; SMCJ70 used on non-isolated rails. Use Value: Meets IEC 61000-4-5 Level 4 (4kV) when combined with appropriate series impedance, due to fast clamping and low VC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70A | 600W PPK rating, same VWM/VBR/VC but lower IPPM (6.3A vs. 12.6A), SMB package (smaller footprint) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a (load dump) | Select SMCJ70 for automotive-grade 1500W surge handling; SMBJ70A only where space constraints outweigh power margin needs. |
| 1.5SMC70A | Same 1500W rating and DO-214AB package, but from ON Semiconductor; VBR 77.8–95.1V, VC 125V - identical parametric envelope | No functional or layout difference; qualified for same automotive and industrial standards | Direct second-source option with identical pinout, thermal profile, and qualification data - suitable for BOM diversification. |
Compared with SMBJ70A and 1.5SMC70A, the SMCJ70 provides full 1500W surge capacity in the industry-standard SMC package, whereas SMBJ70A sacrifices power rating for size reduction, and 1.5SMC70A offers manufacturer redundancy without design change.
Availability
SMCJ70 is available at Aetrix Electronics and suitable for automotive ECU design, industrial motor control, LED driver development, and telecom power supply projects requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMCJ70 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 TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMCJ70 belongs to TSC's SMCJ series of high-power surface-mount TVS diodes, engineered specifically for robust transient immunity in harsh automotive and industrial environments where ISO 7637-2 and AEC-Q200 alignment are required.
FAQ
What is the clamping voltage of the SMCJ70 under standard test conditions?
The SMCJ70 has a maximum clamping voltage (VC) of 125 V when subjected to a 10/1000 μs waveform peak pulse current (IPPM) of 12.6 A, measured at TA = 25°C. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events.
Is the SMCJ70 suitable for bidirectional transient protection?
No - the SMCJ70 is a unidirectional TVS diode intended for DC line protection with defined polarity. For bidirectional applications such as AC lines or differential buses, the SMCJ70CA variant must be used; it shares identical VWM, VBR, and VC ratings but conducts in both directions.
Does the SMCJ70 require derating at elevated ambient temperatures?
Yes - the SMCJ70's peak pulse power (PPK) must be derated linearly above TA = 25°C per Figure 2 in the datasheet, with zero capability at TA ≥ 150°C. Its RθJA of 55°C/W means a 50°C ambient rise above 25°C reduces usable PPK by ~45%, requiring thermal layout consideration in enclosed enclosures.
What is the moisture sensitivity level (MSL) of the SMCJ70, and how does it affect handling?
The SMCJ70 is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and may be mounted directly after removal from dry pack without baking. This eliminates moisture-related popcorning risk during reflow and simplifies manufacturing for high-volume SMT lines.
How does the SMCJ70 compare to the SMCJ70A in terms of electrical performance?
The SMCJ70A offers tighter VBR tolerance (77.8–86.0 V vs. 77.8–95.1 V for SMCJ70) and lower clamping voltage (113 V vs. 125 V at 13.9 A), resulting in improved protection margin for precision-sensitive circuits - though both share identical VWM (70 V), PPK (1500 W), and package (DO-214AB).
SMCJ70 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 12.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ70 FAQ
1.How can I place an order for SMCJ70 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70 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 SMCJ70 reliable?
The price and inventory of SMCJ70 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70 is usually 5 days.
3.What payment methods are accepted for SMCJ70?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70?
SMCJ70 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70 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 SMCJ70?
For technical support, including SMCJ70 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70 requirements.
6.How does Aetrix verify that SMCJ70 is sourced from the original manufacturer or authorized distributors?
All SMCJ70 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 SMCJ70 meets industry standards.
7.What is the process for return or replacement of SMCJ70?
All SMCJ70 units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70, 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 SMCJ70 part is unused and in its original packaging.
Return procedure for SMCJ70:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ70 Tags
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