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Vishay General Semiconductor - Diodes Division SMCJ70CA-E3/9AT
- Part No.:
- SMCJ70CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70CA-E3/9AT.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,218
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Product details
Overview
SMCJ70CA-E3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on signal or power lines. It features 70 V standoff voltage (VWM), 113 V maximum clamping voltage at 13.3 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation with 10/1000 μs waveform.
For engineers reviewing the SMCJ70CA-E3/9AT datasheet, SMCJ70CA-E3/9AT pinout, SMCJ70CA-E3/9AT application, or SMCJ70CA-E3/9AT equivalent, key selection criteria include bidirectional surge protection capability, low clamping ratio (VC/VWM = 1.61), AEC-Q101 qualification eligibility, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ70CA-E3/9AT operates as a bidirectional avalanche diode, symmetrically clamping transient overvoltages in both polarities without polarity marking. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, enabling fast response to ESD and lightning-induced surges.
Designed for use in ungrounded or floating signal paths, it delivers consistent clamping performance across -55 °C to +150 °C operating junction temperature, with thermal resistance RθJA of 75 °C/W and RθJL of 15 °C/W - critical for reliability in automotive and industrial environments where ambient temperatures exceed 85 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - verified breakdown threshold range ensuring predictable turn-on |
| VC @ IPPM | 113 V at 13.3 A - clamping voltage under standardized 10/1000 μs surge, limiting downstream stress |
| PPPM | 1500 W - peak pulse power handling capacity per single transient event |
| ID @ VWM | 1.0 μA - ultra-low leakage current preserving signal integrity in high-impedance circuits |
| TJ max | +150 °C - extended junction temperature rating supporting under-hood automotive use |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 0.320" body length and matte tin leads |
Pinout & Package
SMCJ70CA-E3/9AT uses the SMC (DO-214AB) package: a 2-terminal surface-mount device with no polarity marking for bidirectional operation. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Conducts during negative voltage excursions; symmetrical with cathode in bidirectional mode |
| Cathode | Transient current entry (positive half-cycle) | Conducts during positive voltage excursions; functionally identical to anode in CA-type devices |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled or floating lines without polarity constraints or external circuitry |
| 1500 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 (4 kV) surge events when mounted on 8 mm × 8 mm copper pads |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to protected ICs such as CAN transceivers or sensor front-ends |
| AEC-Q101 qualification path | Base P/NHE3 suffix variants support automotive-grade reliability validation per stress test requirements |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow at 260 °C peak without baking, simplifying SMT production |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converters and microcontrollers. Use Value: Limits voltage to ≤113 V during 13.3 A surges, preventing latch-up or gate oxide damage in downstream MOSFETs and LDOs. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector interface before signal conditioning amplifier. Use Value: Sub-μA leakage preserves millivolt-level signal accuracy; 113 V clamping prevents op-amp input stage saturation. |
| Telecom Data Line Surge Suppression | Consumer USB Port Overvoltage Protection |
Use Scenario: Safeguarding RS-485 transceivers in building automation networks exposed to induced lightning surges. IC Role / Device Role / Timing Role: Bidirectional shunt device on differential pair, referenced to local ground plane. Use Value: Symmetric clamping maintains common-mode rejection while absorbing up to 1500 W of coupled energy. | Use Scenario: Preventing damage to USB 2.0 PHY and controller ICs from hot-plug contact bounce or ESD. IC Role / Device Role / Timing Role: Standoff-rated TVS on VBUS line, sized to survive 15 kV HBM ESD pulses. Use Value: 70 V VWM avoids conduction during normal 5 V operation; 113 V VC ensures safe margin below 16 V USB OTG tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA-E3/52T | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM/VC specs | Reduced surge margin; suitable only for lower-energy threats (e.g., IEC 61000-4-2 ESD) | Select when board space is constrained and peak surge energy does not exceed 600 W. |
| SMCJ70A-E3/9AT | Unidirectional variant; includes cathode band marking; otherwise identical VWM, VBR, VC, and PPPM | Requires polarity-aware layout; used where DC bias or asymmetric transients dominate | Choose only if circuit topology mandates unidirectional clamping (e.g., grounded supply rail). |
Compared with SMCJ70CA-E3/9AT, SMBJ70CA-E3/52T trades surge robustness for footprint reduction, while SMCJ70A-E3/9AT adds polarity dependency without improving clamping performance - making the original bidirectional SMCJ70CA-E3/9AT optimal for floating, AC, or polarity-agnostic protection.
Availability
SMCJ70CA-E3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom data line protection, and consumer USB port hardening requiring stable component supply and long-term lifecycle continuity.
Supply support for SMCJ70CA-E3/9AT 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, precision, and application-specific performance.
The SMCJ series targets high-energy transient suppression in harsh environments; its design prioritizes low clamping ratio, repeatable avalanche behavior, and AEC-Q101 readiness for automotive and industrial deployment.
FAQ
What is the standoff voltage rating of the SMCJ70CA-E3/9AT?
The SMCJ70CA-E3/9AT has a standoff voltage (VWM) of 70 V - the maximum DC or continuous reverse voltage it can withstand without entering breakdown. This value is confirmed in the Vishay datasheet Document Number 88394, Table "ELECTRICAL CHARACTERISTICS", row SMCJ70A/SMCJ70CA. Operation above this voltage triggers clamping action.
Is the SMCJ70CA-E3/9AT suitable for automotive applications?
Yes, the SMCJ70CA-E3/9AT is eligible for automotive use: its base part number supports AEC-Q101 qualification via the HE3 suffix variant (e.g., SMCJ70CAHE3_A/I), and its construction - glass-passivated junction, MSL Level 1 rating, and -55 °C to +150 °C operating range - meets core automotive reliability requirements. The SMCJ70CA-E3/9AT itself is RoHS-compliant commercial grade.
How does the bidirectional configuration of SMCJ70CA-E3/9AT affect PCB layout?
The SMCJ70CA-E3/9AT has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. Unlike unidirectional variants (e.g., SMCJ70A-E3/9AT), it requires no cathode band alignment, reducing assembly error risk and simplifying layout for AC-coupled or floating lines such as RS-485 or Ethernet PHY interfaces.
What is the maximum clamping voltage of SMCJ70CA-E3/9AT under surge conditions?
The maximum clamping voltage (VC) of the SMCJ70CA-E3/9AT is 113 V, measured at its rated peak pulse current (IPPM) of 13.3 A using the standard 10/1000 μs waveform. This value is specified in the "ELECTRICAL CHARACTERISTICS" table of the Vishay datasheet 88394 and defines the upper voltage limit imposed on protected circuitry during worst-case transients.
Does SMCJ70CA-E3/9AT require a heatsink for standard operation?
No, the SMCJ70CA-E3/9AT does not require an external heatsink for transient suppression duty, as it handles energy in short-duration pulses (e.g., <1 ms). Its thermal resistance RθJA is 75 °C/W, and steady-state power dissipation (PD) is only 6.5 W - well below typical surge event energy. However, PCB copper pad area (minimum 8.0 mm × 8.0 mm per terminal) must be maintained to sustain 1500 W peak pulse ratings.
SMCJ70CA-E3/9AT 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:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ70CA-E3/9AT FAQ
1.How can I place an order for SMCJ70CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70CA-E3/9AT 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 SMCJ70CA-E3/9AT reliable?
The price and inventory of SMCJ70CA-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ70CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70CA-E3/9AT?
SMCJ70CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70CA-E3/9AT 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 SMCJ70CA-E3/9AT?
For technical support, including SMCJ70CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ70CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ70CA-E3/9AT 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 SMCJ70CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ70CA-E3/9AT?
All SMCJ70CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70CA-E3/9AT, 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 SMCJ70CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ70CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ70CA-E3/9AT Tags
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