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Vishay General Semiconductor - Diodes Division SMCJ70CA-E3/51T
- Part No.:
- SMCJ70CA-E3/51T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70CA-E3/51T.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,959
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Product details
Overview
SMCJ70CA-E3/51T from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. It features a 70 V stand-off voltage (VWM), 113 V maximum clamping voltage (VC) at 13.3 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation (PPPM) under 10/1000 µs waveform - deployed in automotive sensor signal lines, industrial I/O ports, and telecom interface protection.
For engineers reviewing the SMCJ70CA-E3/51T datasheet, SMCJ70CA-E3/51T pinout, SMCJ70CA-E3/51T application, or SMCJ70CA-E3/51T equivalent, key selection criteria include bi-directional clamping symmetry, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified as 77.8 V (min) to 86.0 V (max) at 1 mA test current - ensuring consistent surge response regardless of transient polarity. Its low incremental surge resistance enables rapid energy diversion during ESD or lightning-induced transients.
Thermal performance is defined by junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W, supporting reliable operation up to 150 °C junction temperature. The device meets UL 497B recognition and complies with JESD201 Class 1A whisker testing via its matte tin-plated leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - defines symmetric breakdown threshold in both directions |
| VC @ IPPM | 113 V at 13.3 A - clamping voltage under 10/1000 µs surge, limiting protected circuit stress |
| PPPM | 1500 W - peak transient power handling capability per standard waveform |
| TJ max. | +150 °C - maximum junction temperature enabling use in under-hood automotive environments |
| MSL Level | Level 1 (J-STD-020) - no floor life limitation; supports standard reflow without baking |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with molded UL 94 V-0 compound and unmarked body for bi-directional polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional transient conduction path | No polarity marking; terminals interchangeable - clamps positive or negative transients identically |
| Case (body) | Non-electrical mechanical interface | Thermally conductive plastic housing; requires 8.0 mm × 8.0 mm copper pad per terminal for rated PPPM |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| Low RθJL (15 °C/W) | Supports high-energy surge dissipation directly into PCB copper, reducing need for external heatsinking |
| MSL Level 1 rating | Eliminates pre-bake requirements during SMT assembly, lowering manufacturing cost and cycle time |
| Glass-passivated junction | Ensures stable VBR and low leakage (<1.0 µA at VWM) over lifetime and temperature extremes |
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 ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Standby clamping element placed between signal line and ground, responding within <1 ns to transients exceeding 70 V. Use Value: Limits voltage seen by downstream ASICs to ≤113 V during 1500 W surges, preserving signal integrity and preventing latch-up. | Use Scenario: Shielding digital input/output channels in programmable logic controllers against inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Parallel-connected transient shunt on each I/O pin, activated only during overvoltage events above VWM. Use Value: Absorbs 13.3 A peak current without degradation, maintaining functional safety compliance per IEC 61000-4-5 Level 4. |
| Telecom Line Interface | Consumer Power Adapter Feedback Loop |
Use Scenario: Safeguarding Ethernet PHYs and DSL line drivers against lightning-induced surges on twisted-pair data lines. IC Role / Device Role / Timing Role: Bi-directional clamp on differential pair, referenced to local ground with matched VBR tolerance. Use Value: Symmetric clamping ensures balanced common-mode suppression and preserves signal eye diagram integrity. | Use Scenario: Protecting optocoupler feedback paths in isolated AC/DC adapters from secondary-side transients. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) shunt across feedback resistor network to prevent false regulation during ESD events. Use Value: Prevents output voltage runaway by clamping feedback node to ≤113 V while adding negligible phase shift at 10–100 kHz loop frequencies. |
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 package (DO-214AA), higher RθJA (110 °C/W) | Not suitable for 1500 W surge environments; limited to lower-energy I/O lines | Select when board space is constrained and peak surge energy is ≤600 W |
| SMCJ70A-E3/51T | Uni-directional variant; includes cathode band marking; same VWM/VC/PPPM but asymmetric conduction | Requires polarity-aware layout; unsuitable for AC or floating signals | Choose only for DC-biased rails where reverse conduction must be blocked |
Compared with SMBJ70CA-E3/52T and SMCJ70A-E3/51T, the SMCJ70CA-E3/51T uniquely delivers bi-directional 1500 W surge immunity in an AEC-Q101-qualified SMC package - making it the sole option for automotive-grade, polarity-agnostic protection at this power level.
Availability
SMCJ70CA-E3/51T is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface designs requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ70CA-E3/51T 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive qualification.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure applications.
FAQ
What does the "CA" suffix indicate in SMCJ70CA-E3/51T?
The "CA" suffix denotes a bi-directional configuration, meaning the SMCJ70CA-E3/51T provides symmetrical clamping for both positive and negative transients. Unlike uni-directional variants (e.g., SMCJ70A), it has no polarity marking and functions identically regardless of voltage polarity applied across its terminals - critical for protecting AC-coupled or floating signal paths.
Is SMCJ70CA-E3/51T qualified for automotive use?
Yes, the SMCJ70CA-E3/51T is AEC-Q101 qualified, having passed stress tests including temperature cycling, high-temperature reverse bias, and accelerated life testing. This qualification confirms its suitability for under-hood and cabin applications such as engine control units, ADAS camera modules, and body electronics - provided thermal design adheres to the 8.0 mm × 8.0 mm pad layout.
What is the maximum clamping voltage of SMCJ70CA-E3/51T and under what conditions?
The SMCJ70CA-E3/51T has a maximum clamping voltage (VC) of 113 V, measured at 13.3 A peak pulse current (IPPM) using the standardized 10/1000 µs double-exponential waveform. This value represents the upper limit of voltage imposed on the protected circuit during worst-case surge events, ensuring downstream ICs remain within safe operating limits.
Does SMCJ70CA-E3/51T require special PCB layout considerations?
Yes - to achieve rated 1500 W peak pulse power, the SMCJ70CA-E3/51T must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, per Vishay specification. Smaller pads reduce thermal dissipation and cause premature failure under repeated surges; thermal vias to inner ground planes are recommended for sustained high-energy operation.
How does the MSL Level 1 rating affect handling of SMCJ70CA-E3/51T?
The MSL Level 1 rating means the SMCJ70CA-E3/51T has unlimited floor life and may be placed directly into reflow soldering without prior baking. This eliminates moisture-related popcorning risk and simplifies SMT line integration - unlike higher-MSL devices that require dry-packaging and strict humidity-controlled storage.
SMCJ70CA-E3/51T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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-E3/51T FAQ
1.How can I place an order for SMCJ70CA-E3/51T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70CA-E3/51T 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-E3/51T reliable?
The price and inventory of SMCJ70CA-E3/51T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70CA-E3/51T is usually 5 days.
3.What payment methods are accepted for SMCJ70CA-E3/51T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70CA-E3/51T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70CA-E3/51T?
SMCJ70CA-E3/51T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70CA-E3/51T 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-E3/51T?
For technical support, including SMCJ70CA-E3/51T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70CA-E3/51T requirements.
6.How does Aetrix verify that SMCJ70CA-E3/51T is sourced from the original manufacturer or authorized distributors?
All SMCJ70CA-E3/51T 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-E3/51T meets industry standards.
7.What is the process for return or replacement of SMCJ70CA-E3/51T?
All SMCJ70CA-E3/51T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70CA-E3/51T, 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-E3/51T part is unused and in its original packaging.
Return procedure for SMCJ70CA-E3/51T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ70CA-E3/51T Tags
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