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Vishay General Semiconductor - Diodes Division SMCJ70CAHE3/9AT
- Part No.:
- SMCJ70CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70CAHE3/9AT.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,399
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Product details
Overview
SMCJ70CAHE3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 70 V standoff voltage (VWM), 1500 W peak pulse power (10/1000 μs), and clamping voltage of 113 V at 13.3 A peak pulse current. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ70CAHE3/9AT datasheet, SMCJ70CAHE3/9AT pinout, SMCJ70CAHE3/9AT application, or SMCJ70CAHE3/9AT equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, 1500 W surge rating, 75 °C/W junction-to-ambient thermal resistance, and RoHS-compliant matte tin-plated leads suitable for automated SMT placement.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging an avalanche breakdown mechanism with low incremental surge resistance and fast sub-nanosecond response. Its bidirectional symmetry ensures identical clamping in both polarities, eliminating polarity concerns in AC-coupled or floating signal paths.
Designed for surface-mount use on 8.0 mm × 8.0 mm copper pads, it delivers 1500 W peak pulse power under standardized 10/1000 μs waveform conditions and maintains stable operation across -55 °C to +150 °C junction temperature range, supported by MSL Level 1 moisture sensitivity rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown threshold range for reliable turn-on margin |
| VC @ IPPM | 113 V at 13.3 A - Clamped voltage during full 1500 W surge, defining protected circuit stress level |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 μs waveform, critical for lightning/inductive spike immunity |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 75 °C/W - Thermal resistance indicating required PCB copper area for sustained power dissipation |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H), 0.320″ lead spacing, matte tin-plated terminals solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | One terminal of symmetrical PN junction; conducts during negative overvoltage events |
| Cathode | Transient current entry (positive half-cycle) | Other terminal of symmetrical PN junction; conducts during positive overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM performance in both directions eliminates need for polarity-aware layout |
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR = 35.2 V) and reduced let-through energy during fast transients |
| MSL Level 1 rating | Allows unlimited floor life and reflow without baking, simplifying SMT manufacturing flow |
| Glass passivated junction | Enhances long-term stability and humidity resistance in harsh industrial environments |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Primary clamping element placed at power input stage before DC-DC converters. Use Value: Withstands 1500 W surges while limiting voltage to 113 V, preventing damage to downstream 40 V-rated regulators and microcontrollers. | Use Scenario: Shielding analog outputs of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance shunt protector on 0–5 V or 4–20 mA signal paths. Use Value: Bidirectional symmetry ensures protection against both positive and negative ESD events without signal inversion or bias dependency. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Guarding Ethernet PHY interface circuits against induced surges on PoE-powered devices. IC Role / Device Role / Timing Role: Secondary-level TVS after gas discharge tube (GDT) front-end, providing fast-response clamping. Use Value: Sub-ns response time captures residual transients missed by slower primary protectors, reducing risk of PHY IC latch-up. | Use Scenario: Input-stage surge suppression in universal AC/DC adapters for smartphones and laptops. IC Role / Device Role / Timing Role: Final-line defense after MOV and fuse, absorbing residual energy from differential-mode surges. Use Value: 70 V VWM matches typical bridge rectifier output, allowing direct placement before bulk capacitor without leakage issues. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC70CA | Lower PPPM (600 W), same VWM and package; higher clamping voltage (120 V) | Not suitable for high-energy automotive load dump; acceptable for consumer-grade ESD-only protection | Select SMCJ70CAHE3/9AT when 1500 W surge immunity is required; SAC70CA only for cost-sensitive, lower-stress designs |
| SMCJ70AHE3/9AT | Unidirectional version; includes cathode band marking; forward voltage drop (3.5 V @ 100 A) not applicable here | Requires polarity-aware PCB layout; unsuitable for AC or floating signal paths | Choose SMCJ70CAHE3/9AT for bidirectional signal lines or ungrounded systems; use unidirectional only where ground reference is fixed and polarity known |
Compared with SAC70CA and SMCJ70AHE3/9AT, the SMCJ70CAHE3/9AT uniquely combines AEC-Q101 qualification, 1500 W rating, and true bidirectional symmetry-making it the only option among the three qualified for automotive power rail protection without polarity constraints or derating.
Availability
SMCJ70CAHE3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface, telecom line protection, and consumer adapter input applications requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ70CAHE3/9AT 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, power efficiency, and automotive-grade qualification.
The SMCJ series is engineered specifically for high-energy transient suppression in demanding environments-including under-hood automotive, industrial motor drives, and telecom infrastructure-where robustness and repeatable clamping performance are non-negotiable.
FAQ
What is the clamping voltage of SMCJ70CAHE3/9AT at its rated peak pulse current?
The SMCJ70CAHE3/9AT clamps to 113 V at its specified peak pulse current of 13.3 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the maximum voltage imposed on protected circuitry during a full-rated surge event. The SMCJ70CAHE3/9AT achieves this with low incremental resistance, ensuring predictable let-through energy for downstream components.
Is SMCJ70CAHE3/9AT suitable for automotive applications?
Yes, the SMCJ70CAHE3/9AT is AEC-Q101 qualified and explicitly designated for automotive use with suffix "HE3". It undergoes rigorous stress testing-including temperature cycling, high-temperature reverse bias, and ESD-to ensure reliability in engine control units, body electronics, and ADAS sensor modules. The SMCJ70CAHE3/9AT meets automotive-grade requirements for surge immunity, thermal stability, and long-term parametric drift.
How does the bidirectional design of SMCJ70CAHE3/9AT affect PCB layout?
The SMCJ70CAHE3/9AT has no polarity marking and identical electrical characteristics in both directions, eliminating orientation constraints during placement. Unlike unidirectional TVS diodes such as SMCJ70AHE3/9AT, the SMCJ70CAHE3/9AT can be mounted without regard to anode/cathode alignment-reducing assembly errors and enabling simplified routing on differential or floating signal lines. This symmetry is confirmed in the Vishay datasheet section "DEVICES FOR BIDIRECTION APPLICATIONS".
What is the thermal resistance and recommended pad layout for SMCJ70CAHE3/9AT?
The SMCJ70CAHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended 0.31″ × 0.31″ (8.0 mm × 8.0 mm) copper pads per terminal. This pad size is specified in the Vishay datasheet Figure 2 derating curve and ensures safe operation at full 1500 W pulse power. For continuous power dissipation, the SMCJ70CAHE3/9AT's 6.5 W rating requires additional thermal relief or heatsinking beyond standard FR-4 layout.
Does SMCJ70CAHE3/9AT meet RoHS and halogen-free requirements?
Yes, the SMCJ70CAHE3/9AT carries the "HE3" suffix, indicating RoHS-compliant construction and AEC-Q101 qualification. It uses matte tin-plated leads and UL 94 V-0 molding compound. While not halogen-free (which would require "HM3" suffix), the SMCJ70CAHE3/9AT complies fully with EU RoHS Directive 2011/65/EU and is documented in Vishay's material categorization system (www.vishay.com/doc?99912). The SMCJ70CAHE3/9AT is certified for commercial and automotive use without restriction.
SMCJ70CAHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ70CAHE3/9AT FAQ
1.How can I place an order for SMCJ70CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70CAHE3/9AT 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 SMCJ70CAHE3/9AT reliable?
The price and inventory of SMCJ70CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ70CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70CAHE3/9AT?
SMCJ70CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70CAHE3/9AT 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 SMCJ70CAHE3/9AT?
For technical support, including SMCJ70CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70CAHE3/9AT requirements.
6.How does Aetrix verify that SMCJ70CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ70CAHE3/9AT 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 SMCJ70CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ70CAHE3/9AT?
All SMCJ70CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70CAHE3/9AT, 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 SMCJ70CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ70CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ70CAHE3/9AT Tags
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