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Vishay General Semiconductor - Diodes Division SMCJ70CAHM3/I
- Part No.:
- SMCJ70CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70CAHM3/I.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,974
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Product details
Overview
SMCJ70CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 70 V standoff voltage, 1500 W peak pulse power rating, and 113 V maximum clamping voltage at 13.3 A peak pulse current. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems against inductive switching transients and lightning-induced surges.
For engineers reviewing the SMCJ70CAHM3/I datasheet, SMCJ70CAHM3/I pinout, SMCJ70CAHM3/I application, or SMCJ70CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamped crowbar during transient events, leveraging an avalanche breakdown mechanism to divert surge current away from protected circuitry. Its bidirectional symmetry ensures identical electrical characteristics in both polarities, eliminating polarity sensitivity in AC-coupled or differential signal paths.
Thermal performance is defined by 15 °C/W junction-to-lead resistance and 75 °C/W junction-to-ambient resistance under standard mounting conditions. The device sustains operation across -55 °C to +150 °C junction temperature range and meets J-STD-020 MSL Level 1 reflow requirements with 260 °C peak soldering profile.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VWM) | 70 V - Maximum continuous reverse operating voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 77.8–86.0 V at 1 mA - Confirmed avalanche initiation range for reliable clamping onset |
| Clamping Voltage (VC) | 113 V at 13.3 A (10/1000 μs) - Peak voltage seen by protected circuit during rated surge |
| Peak Pulse Power (PPPM) | 1500 W - Energy-handling capacity for standardized 10/1000 μs surge waveform |
| Leakage Current (ID) | 1.0 μA max at 70 V - Minimal loading on signal or power lines during normal operation |
| Junction Temperature Range | -55 °C to +150 °C - Enables deployment in under-hood automotive and industrial environments |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Terminal 1) | Anode/Cathode terminal pair | Bidirectional structure - no functional distinction; either terminal serves as cathode or anode depending on transient polarity |
| Anode (Terminal 2) | Anode/Cathode terminal pair | Electrically symmetric with Terminal 1; enables clamping in both directions without external polarity management |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout or orientation control |
| AEC-Q101 qualification | Validated for automotive-grade reliability - supports use in ADAS sensors, body control modules, and infotainment power rails |
| Halogen-free & RoHS-compliant | HM3 suffix indicates full compliance with environmental regulations and JEDEC JESD201 Class 2 whisker resistance |
| Low incremental surge resistance | Enables tighter clamping with minimal voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) |
| MSL Level 1 moisture sensitivity | Unlimited floor life at ≤30 °C/60% RH - compatible with standard SMT production without dry-pack or baking requirements |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and alternator ripple in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector interface to clamp ±100 V transients before reaching PHY layer. Use Value: Prevents latch-up or permanent damage to transceivers while maintaining signal integrity due to low capacitance (<100 pF) and symmetric clamping. | Use Scenario: Shielding digital input/output channels of programmable logic controllers from field-side surges caused by relay coil de-energization or motor drive noise. IC Role / Device Role / Timing Role: Primary overvoltage protection element on 24 V DC I/O terminals, mounted adjacent to screw-terminal blocks. Use Value: Absorbs up to 1500 W surge energy without degradation, enabling robust operation in factory-floor environments with frequent switching transients. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Safeguarding Ethernet PHYs and PoE injectors against lightning-induced common-mode surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Paired bidirectional TVS on each differential pair (e.g., TX+/TX−, RX+/RX−) to suppress mode conversion transients. Use Value: Matches differential impedance while providing symmetrical clamping, preserving signal timing margins and reducing EMI coupling. | Use Scenario: Secondary-side transient suppression on 5–24 V DC outputs of wall adapters used in smart home devices and wearables. IC Role / Device Role / Timing Role: Final-stage protection before LDO or USB-PD controller, guarding against hot-plug and cable discharge events. Use Value: Halogen-free construction meets IEC 62368-1 flame-retardant requirements; compact SMC footprint minimizes board area in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CAHE3/A | Same VWM (70 V), lower PPPM (400 W), SMA package (smaller thermal mass) | Limited to lower-energy surges; unsuitable for ISO 7637-2 Pulse 5a or IEC 61000-4-5 Level 3 | Select only when surge threat level is constrained and board space is critical |
| SMCJ70CA-E3/57T | Identical electrical specs and SMC package; differs only in packaging (tape-and-reel vs. bulk) and RoHS status (RoHS-compliant but not halogen-free) | No functional difference; suitable for commercial-grade non-automotive applications where halogen content is unrestricted | Prefer for cost-sensitive industrial designs without automotive qualification requirements |
Compared with SMAJ70CAHE3/A and SMCJ70CA-E3/57T, the SMCJ70CAHM3/I delivers higher surge immunity (1500 W vs. 400 W) and automotive-grade reliability (AEC-Q101 + halogen-free), making it optimal for safety-critical or harsh-environment deployments where long-term stability under repeated transients is mandatory.
Availability
SMCJ70CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line interfaces, and consumer power adapter designs requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ70CAHM3/I 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 application-specific optimization.
The SMCJ series targets high-energy transient suppression in demanding environments, with design focus on automotive-grade robustness, industrial surge immunity, and seamless integration into automated SMT manufacturing flows.
FAQ
What is the clamping voltage of the SMCJ70CAHM3/I under a 10/1000 µs surge?
The SMCJ70CAHM3/I clamps to a maximum of 113 V when subjected to a 13.3 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMCJ70CAHM3/I maintains this clamping performance across its full operating temperature range.
Is the SMCJ70CAHM3/I suitable for automotive applications?
Yes, the SMCJ70CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It meets stress test requirements including high-temperature operating life, temperature cycling, and ESD robustness. The SMCJ70CAHM3/I is deployed in engine control units, ADAS camera modules, and body electronics where sustained reliability under thermal and electrical stress is required.
How does the bidirectional configuration of the SMCJ70CAHM3/I affect circuit design?
The bidirectional configuration of the SMCJ70CAHM3/I eliminates polarity constraints during placement, allowing direct integration into AC-coupled, differential, or floating signal paths without orientation checks. Unlike unidirectional TVS diodes, the SMCJ70CAHM3/I provides identical clamping behavior regardless of transient polarity, simplifying layout and reducing risk of misorientation in high-volume manufacturing. Its symmetric structure supports protection of both positive and negative excursions equally.
What is the thermal resistance of the SMCJ70CAHM3/I and how does it impact power dissipation?
The SMCJ70CAHM3/I has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads. These values determine steady-state power handling: at 25 °C ambient, the device dissipates up to 6.5 W continuously. For transient events, thermal mass absorbs energy without exceeding 150 °C junction limit. Proper pad layout is essential to realize specified RθJA in actual PCB designs.
Does the SMCJ70CAHM3/I require special handling during reflow soldering?
No, the SMCJ70CAHM3/I is rated MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C without preconditioning. It may be processed using standard lead-free reflow profiles without dry packing or baking. The matte tin-plated leads comply with J-STD-002 and JESD 22-B102 for solderability, and the device passes JEDEC JESD201 Class 2 whisker testing. The SMCJ70CAHM3/I is fully compatible with automated SMT assembly lines.
SMCJ70CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ70CAHM3/I FAQ
1.How can I place an order for SMCJ70CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70CAHM3/I 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 SMCJ70CAHM3/I reliable?
The price and inventory of SMCJ70CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ70CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70CAHM3/I?
SMCJ70CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70CAHM3/I 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 SMCJ70CAHM3/I?
For technical support, including SMCJ70CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70CAHM3/I requirements.
6.How does Aetrix verify that SMCJ70CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ70CAHM3/I 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 SMCJ70CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ70CAHM3/I?
All SMCJ70CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70CAHM3/I, 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 SMCJ70CAHM3/I part is unused and in its original packaging.
Return procedure for SMCJ70CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ70CAHM3/I Tags
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