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Vishay General Semiconductor - Diodes Division SMCJ7.0A-M3/9AT
- Part No.:
- SMCJ7.0A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ7.0A-M3/9AT.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ7.0A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 7.0 V stand-off voltage (VWM), 7.78–8.60 V breakdown voltage (VBR) at 10 mA, 1500 W peak pulse power (10/1000 µs), and clamps transients to ≤12.0 V at 125 A IPPM. It is widely used in automotive ECUs, industrial PLC I/O modules, and telecom power supplies.
For engineers reviewing the SMCJ7.0A-M3/9AT datasheet, SMCJ7.0A-M3/9AT pinout, SMCJ7.0A-M3/9AT application, or SMCJ7.0A-M3/9AT equivalent, this page delivers verified electrical specs, thermal behavior, polarity marking, AEC-Q101 qualification status (via HM3 variant), and real-world design implications for surge immunity in 12 V systems.
Technical Context
The SMCJ7.0A-M3/9AT operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-nanosecond response to ESD and lightning-induced transients. Its low incremental surge resistance (≤0.096 Ω derived from VC/IPPM) ensures minimal voltage overshoot during high-current surges up to 125 A.
Thermally, it exhibits RθJA = 75 °C/W and RθJL = 15 °C/W, supporting reliable operation up to TJ = +150 °C when mounted on 8.0 mm × 8.0 mm copper pads per terminal. The M3 suffix confirms halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse operating voltage before clamping begins; sets system DC rail compatibility (e.g., 12 V nominal bus with 20 % tolerance) |
| VBR (min/max) | 7.78 V / 8.60 V at IT = 10 mA - Confirmed avalanche onset range; defines minimum overvoltage threshold for protection activation |
| VC @ IPPM | 12.0 V at IPPM = 125 A (10/1000 µs) - Clamped voltage seen by protected circuit; determines maximum stress on downstream ICs or MOSFETs |
| PPPM | 1500 W - Peak transient energy handling capacity; enables compliance with IEC 61000-4-5 Level 4 (4 kV line-to-line) |
| ID @ VWM | 200 µA max - Reverse leakage at stand-off voltage; critical for low-power sensor or battery-backed circuits where quiescent current matters |
| TJ max. | +150 °C - Maximum junction temperature; supports under-hood automotive use and industrial environments with elevated ambient temps |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with cathode band marking; compatible with automated pick-and-place and reflow soldering |
Pinout & Package
SMCJ7.0A-M3/9AT uses the SMC (DO-214AB) package: a rectangular, low-profile surface-mount case with two coplanar leads. Polarity is marked by a cathode band on the body; the banded end is the cathode (K), and the opposite end is the anode (A). Leads are matte tin-plated and solderable per J-STD-002/JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Positive terminal for forward conduction; connected to ground or lower-potential node in unidirectional TVS configuration | When placed across a DC supply (e.g., VCC–GND), anode connects to GND; reverse-biased operation protects VCC from positive transients |
| Cathode (K) | Negative terminal; marked by visible band; conducts during reverse avalanche | Connected to the line being protected (e.g., 12 V rail); clamps positive surges to ≤12.0 V above ground |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables single-device protection against severe surges per IEC 61000-4-5 Ed. 3, including indirect lightning strikes on 12 V automotive power nets |
| Clamping voltage ≤12.0 V at 125 A | Ensures protected logic-level components (e.g., microcontrollers, CAN transceivers) remain within absolute maximum ratings during surge events |
| Low incremental surge resistance (~0.096 Ω) | Minimizes dynamic voltage rise during fast-rising transients, improving protection margin for sensitive analog front-ends |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for automotive and industrial OEMs without compromising surge performance |
| MSL Level 1 (J-STD-020), 260 °C peak reflow | Supports standard lead-free PCB assembly without moisture sensitivity concerns or pre-bake requirements |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 12 V supply input of BCM from load-dump transients (ISO 7637-2 Pulse 5a, up to +35 V, 100 ms). IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, clamping surges before they reach LDO regulators and MCU power pins. Use Value: Limits peak voltage to ≤12.0 V during 125 A transients, preventing regulator latch-up and MCU brownout resets. |
Use Scenario: Shields 24 V digital input channel from inductive kickback when switching solenoids or relays. IC Role / Device Role / Timing Role: Mounted across input optocoupler terminals to absorb reverse-energy flyback spikes. Use Value: Prevents optocoupler LED degradation and false triggering by clamping reverse transients to safe levels within 1 ns. |
| Telecom Power Supply Front-End | Consumer Appliance Motor Drive Board |
Use Scenario: Guards AC/DC adapter output against surges induced by nearby lightning or grid switching. IC Role / Device Role / Timing Role: Placed at secondary-side DC output (12 V or 5 V) to protect downstream DC-DC converters and PMICs. Use Value: Absorbs 1500 W pulses without degradation, maintaining output regulation and avoiding catastrophic failure of downstream silicon. |
Use Scenario: Suppresses commutation spikes generated by brushed DC motor back-EMF during PWM switching. IC Role / Device Role / Timing Role: Connected across motor terminals to clamp bidirectional voltage reversals (when used as SMCJ7.0CA variant) or unidirectional spikes. Use Value: Extends MOSFET lifespan by limiting VDS stress to ≤12.0 V, reducing avalanche energy dissipation in the switch. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0A-M3/9AT | Lower PPPM (400 W vs. 1500 W); same VWM/VBR but smaller SMA package (DO-214AC) | Not suitable for IEC 61000-4-5 Level 4; limited to low-energy ESD or board-level coupling events | Select only when space-constrained and surge threat level is ≤1 kV (IEC 61000-4-2 Contact) |
| SMCJ7.0CA-M3/9AT | Bidirectional version; identical VWM/VBR but symmetric clamping in both polarities; same PPPM and package | Required for AC-coupled lines or differential buses (e.g., RS-485, CAN FD) where negative transients occur | Choose when protecting bidirectional signals or ungrounded rails; not interchangeable without circuit review |
Compared with SMAJ7.0A-M3/9AT, the SMCJ7.0A-M3/9AT delivers 3.75× higher surge energy handling in the same footprint family, while SMCJ7.0CA-M3/9AT provides essential symmetry for AC or floating systems-neither is pin-compatible without verifying layout polarity and grounding strategy.
Availability
SMCJ7.0A-M3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply with halogen-free compliance and AEC-Q101 traceability via related HM3 variants.
Supply support for SMCJ7.0A-M3/9AT 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMCJ7.0A-M3/9AT belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in harsh environments-including under-hood automotive, factory automation, and outdoor telecom equipment.
FAQ
What is the clamping voltage of the SMCJ7.0A-M3/9AT at its rated peak pulse current?
The SMCJ7.0A-M3/9AT clamps to a maximum of 12.0 V when subjected to its rated peak pulse current of 125 A under the standardized 10/1000 µs waveform. This value is measured at the device terminals and represents the upper voltage limit imposed on the protected circuit during worst-case surge conditions. The SMCJ7.0A-M3/9AT achieves this with low dynamic impedance, ensuring consistent protection across production lots and temperature ranges from –55 °C to +150 °C.
Is the SMCJ7.0A-M3/9AT qualified for automotive applications?
The SMCJ7.0A-M3/9AT itself carries the commercial-grade M3 suffix (halogen-free, RoHS-compliant), but Vishay offers the functionally identical SMCJ7.0A-HM3/9AT variant which is fully AEC-Q101 qualified for automotive use. The SMCJ7.0A-M3/9AT shares the same electrical characteristics, package, and thermal performance-only the qualification documentation and traceability differ. For production automotive designs, specify HM3-suffixed versions to meet OEM audit requirements.
How does the SMCJ7.0A-M3/9AT differ from the bidirectional SMCJ7.0CA-M3/9AT?
The SMCJ7.0A-M3/9AT is unidirectional and features a cathode band for polarity-sensitive placement, clamping only positive transients relative to ground. In contrast, the SMCJ7.0CA-M3/9AT is bidirectional with no polarity marking and clamps transients of either polarity symmetrically. Both share identical VWM (7.0 V), VBR (7.78–8.60 V), PPPM (1500 W), and SMC package-but they are not interchangeable without modifying circuit grounding and layout. The SMCJ7.0A-M3/9AT must be used where polarity is fixed and ground-referenced protection is required.
What is the maximum reverse leakage current of the SMCJ7.0A-M3/9AT at its stand-off voltage?
The SMCJ7.0A-M3/9AT specifies a maximum reverse leakage current (ID) of 200 µA at its stand-off voltage (VWM) of 7.0 V and TA = 25 °C. This value increases with temperature but remains below 1 mA up to +125 °C. Low ID ensures minimal power loss in always-on systems such as automotive body modules or smart meter backup rails, where quiescent current directly impacts battery life or standby efficiency. The SMCJ7.0A-M3/9AT maintains this spec across its full operating temperature range.
Can the SMCJ7.0A-M3/9AT be used in place of the older SMCJ7.0A-E3/9AT?
Yes-the SMCJ7.0A-M3/9AT is a direct replacement for the SMCJ7.0A-E3/9AT in all electrical and mechanical respects, differing only in material composition: M3 denotes halogen-free molding compound and terminations, while E3 is standard RoHS-compliant (with brominated flame retardants). Both meet JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1. No PCB layout or schematic changes are needed when upgrading from E3 to M3; the SMCJ7.0A-M3/9AT retains identical VWM, VBR, VC, and thermal characteristics.
SMCJ7.0A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- 125A
- 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)
SMCJ7.0A-M3/9AT FAQ
1.How can I place an order for SMCJ7.0A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ7.0A-M3/9AT 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 SMCJ7.0A-M3/9AT reliable?
The price and inventory of SMCJ7.0A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ7.0A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ7.0A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ7.0A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ7.0A-M3/9AT?
SMCJ7.0A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ7.0A-M3/9AT 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 SMCJ7.0A-M3/9AT?
For technical support, including SMCJ7.0A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ7.0A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ7.0A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ7.0A-M3/9AT 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 SMCJ7.0A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ7.0A-M3/9AT?
All SMCJ7.0A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ7.0A-M3/9AT, 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 SMCJ7.0A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ7.0A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ7.0A-M3/9AT Tags
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