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Vishay General Semiconductor - Diodes Division SMCJ70A-M3/9AT
- Part No.:
- SMCJ70A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70A-M3/9AT.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,528
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Product details
Overview
SMCJ70A-M3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 70 V stand-off voltage (VWM), 77.8–86.0 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), and clamps transients to ≤113 V at 13.3 A peak surge current - deployed in automotive power rails and industrial sensor interfaces.
For engineers reviewing the SMCJ70A-M3/9AT datasheet, SMCJ70A-M3/9AT pinout, SMCJ70A-M3/9AT application, or SMCJ70A-M3/9AT equivalent, key selection criteria include unidirectional polarity, SMC (DO-214AB) package compatibility, 1500 W surge rating, and halogen-free RoHS compliance per M3 suffix - critical for AEC-Q101-aligned designs requiring long-term reliability under repetitive transients.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance (<1.5 Ω typical), enabling fast response (<1 ns) to ESD and lightning-induced surges.
Thermal performance is defined by RθJA = 75 °C/W (on recommended 8.0 mm × 8.0 mm copper pads) and TJmax = +150 °C, supporting operation in under-hood automotive environments. The M3 suffix confirms halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR @ IT = 1 mA | 77.8–86.0 V - guaranteed avalanche initiation range; ensures predictable turn-on margin above VWM. |
| VC @ IPPM = 13.3 A | ≤113 V - clamped voltage during 10/1000 µs surge; defines worst-case stress on downstream ICs. |
| PPPM | 1500 W - peak pulse power handling capability; determines survivability against ISO 7637-2 Pulse 1/2a/5a transients. |
| IPPM | 13.3 A - maximum non-repetitive surge current (10/1000 µs); used to size PCB trace width and thermal relief. |
| TJmax | +150 °C - maximum junction temperature; enables use in engine control units and power converters without derating. |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint; supports automated placement and reflow soldering. |
Pinout & Package
SMCJ70A-M3/9AT uses the SMC (DO-214AB) package: a molded, rectangular surface-mount case with two coplanar leads. Polarity is marked by a cathode band on the body; the banded end is the cathode terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-impedance input during normal operation; avalanche conduction path during overvoltage | Connected to protected line (e.g., 12 V rail); sinks surge current to ground when VREV > VBR. |
| Anode | Reference node / return path | Typically tied to system ground; completes clamping loop and establishes reference for VWM/VBR specification. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Withstands high-energy transients per ISO 7637-2 and IEC 61000-4-5 Level 4 without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on protected MOSFETs or microcontrollers during clamping events. |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability across temperature and life cycles. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets automotive environmental standards and eliminates corrosive halogen emissions during board assembly or failure. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free reflow profiles without moisture-related popcorning or delamination. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input, clamping surges within 1 ns. Use Value: Limits voltage to ≤113 V during 13.3 A surges, preventing damage to upstream regulators and MCU power supplies. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across differential signal pair (e.g., RS-485 bus lines) to ground. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) while maintaining signal integrity via <10 pF junction capacitance at 0 V bias. |
| Telecom DC Power Input Protection | Consumer Power Adapter Output Protection |
|
Use Scenario: Safeguarding PoE-powered equipment inputs against induced surges from nearby lightning strikes or AC coupling. IC Role / Device Role / Timing Role: Primary TVS on 48 V DC input stage, coordinated with secondary MOV and fuse. Use Value: Absorbs 1500 W surge energy without thermal runaway, preserving upstream Ethernet PHY and PMIC functionality. |
Use Scenario: Preventing overvoltage damage to USB-C PD controllers and Type-C port electronics during adapter fault conditions. IC Role / Device Role / Timing Role: Secondary-side TVS on 5–20 V output rail, positioned after DC-DC converter and before connector. Use Value: Responds in <1 ns to open-circuit regulator faults, limiting output to 113 V and avoiding catastrophic IC latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-E3/61T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VBR range | Suitable for space-constrained consumer boards but not automotive load dump duty cycles | Select when board area is critical and surge energy is limited to <400 W. |
| SMCJ70CA-M3/9AT | Bidirectional variant; identical VWM, VBR, and PPPM, but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines (e.g., CAN bus, audio lines) where polarity reversal occurs | Choose only if bidirectional protection is mandated by signal topology - unidirectional SMCJ70A-M3/9AT is optimal for DC rails. |
Compared with SMAJ70A-E3/61T and SMCJ70CA-M3/9AT, the SMCJ70A-M3/9AT delivers superior surge energy handling in a thermally robust SMC package while maintaining unidirectional optimization for DC power systems - making it the preferred choice for automotive and industrial 12–48 V rail protection where reliability and power density are prioritized.
Availability
SMCJ70A-M3/9AT is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface hardening, and telecom DC power input protection requiring stable component supply and full traceability.
Supply support for SMCJ70A-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, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMCJ series targets high-energy transient suppression in harsh environments, engineered specifically for ISO 7637-2 and IEC 61000-4-5 compliance in automotive, industrial, and telecom infrastructure applications.
FAQ
What is the maximum clamping voltage of the SMCJ70A-M3/9AT under a 10/1000 µs surge?
The SMCJ70A-M3/9AT clamps to a maximum of 113 V when subjected to its rated 13.3 A peak pulse current (IPPM) using the standardized 10/1000 µs waveform. This value is guaranteed across temperature and lifetime, and directly defines the peak stress imposed on downstream components during surge events - a critical parameter for validating protection margins in 12 V and 24 V automotive systems.
Is the SMCJ70A-M3/9AT AEC-Q101 qualified?
No, the SMCJ70A-M3/9AT is not AEC-Q101 qualified. It carries the M3 suffix indicating halogen-free, RoHS-compliant commercial-grade construction. For AEC-Q101 qualification, the equivalent part is SMCJ70A-HM3_X (e.g., SMCJ70A-HM3_A), which adds automotive stress testing and extended temperature validation while retaining identical electrical specs and SMC package.
What does the "M3" suffix mean in SMCJ70A-M3/9AT?
The "M3" suffix in SMCJ70A-M3/9AT denotes halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance requirements. It specifies matte tin-plated leads, UL 94 V-0 molding compound, and compliance with Vishay's material categorization standard (doc# 99912). Unlike HE3/HM3 variants, M3 parts are commercial grade, not AEC-Q101 qualified.
Can SMCJ70A-M3/9AT be used in bidirectional signal lines like CAN or RS-485?
No - the SMCJ70A-M3/9AT is unidirectional and must not be used on bidirectional or AC-coupled lines. Its cathode band indicates polarity-sensitive operation; reverse-bias conduction is not specified. For CAN, RS-485, or other bidirectional interfaces, use the SMCJ70CA-M3/9AT, which provides symmetrical clamping in both directions with identical VWM, VBR, and PPPM ratings.
What is the thermal resistance junction-to-ambient for SMCJ70A-M3/9AT?
The SMCJ70A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 8.0 mm × 8.0 mm copper pad per terminal. This value assumes FR-4 PCB with no internal planes; actual RθJA improves significantly with additional copper area or internal thermal layers - essential for sustaining 6.5 W steady-state dissipation in enclosed industrial enclosures.
SMCJ70A-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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 13.3A
- 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)
SMCJ70A-M3/9AT FAQ
1.How can I place an order for SMCJ70A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70A-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 SMCJ70A-M3/9AT reliable?
The price and inventory of SMCJ70A-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 SMCJ70A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ70A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70A-M3/9AT?
SMCJ70A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70A-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 SMCJ70A-M3/9AT?
For technical support, including SMCJ70A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ70A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ70A-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 SMCJ70A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ70A-M3/9AT?
All SMCJ70A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70A-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 SMCJ70A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ70A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ70A-M3/9AT Tags
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