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Vishay General Semiconductor - Diodes Division SMCJ70A-E3/9AT
- Part No.:
- SMCJ70A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70A-E3/9AT.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,573
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Product details
Overview
SMCJ70A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails 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), 13.3 A peak pulse current (IPPM), and clamps to 113 V at rated surge. It is widely deployed in automotive ECUs and industrial motor drive power inputs.
For engineers reviewing the SMCJ70A-E3/9AT datasheet, SMCJ70A-E3/9AT pinout, SMCJ70A-E3/9AT application, or SMCJ70A-E3/9AT equivalent, key selection criteria include unidirectional polarity, 113 V clamping performance under 13.3 A surge, RoHS-compliant matte tin terminations, MSL Level 1 rating, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ70A-E3/9AT operates as a silicon avalanche diode, leveraging glass-passivated junction technology for stable, repeatable clamping behavior during transient events. Its low incremental surge resistance and fast response time (<1 ns) enable effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
It is rated for continuous operation from –55 °C to +150 °C junction temperature, with thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead). The device meets JESD201 Class 2 whisker resistance and is RoHS-compliant per base P/N-E3 suffix.
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 avalanche onset range under standardized test conditions |
| VC @ IPPM | 113 V - Clamped voltage during full 1500 W, 10/1000 µs surge event |
| PPPM | 1500 W - Peak pulse power handling capability per standard waveform |
| ID @ VWM | 1.0 µA - Reverse leakage current at rated stand-off voltage, ensuring minimal standby power loss |
| TJ max. | +150 °C - Maximum junction temperature enabling use in under-hood automotive and high-temperature industrial environments |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
Pinout & Package
Package: SMC (DO-214AB), 2-terminal surface-mount case with cathode band marking. Matte tin-plated leads meet J-STD-002 and JESD22-B102 solderability standards. MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or return path; defines current flow direction during clamping |
| Cathode (banded end) | High-side transient input terminal | Connected to protected line (e.g., 70 V rail); conducts avalanche current to anode when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables high-density PCB layouts and compatibility with automated pick-and-place equipment |
| Glass-passivated junction | Ensures long-term reliability and stable VBR drift under thermal cycling and humidity stress |
| 1500 W peak pulse power | Provides robust protection against IEC 61000-4-5 Level 4 (4 kV surge) events on 12–48 V systems |
| 113 V clamping at 13.3 A | Limits downstream IC stress during transients while maintaining safe margin below typical 130 V MOSFET VDS ratings |
| AEC-Q101 qualification option | Available in HE3 variant for automotive-grade applications requiring validated reliability testing |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed microcontroller power rails in engine control units against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp positive-going surges above 70 V. Use Value: Limits peak voltage to 113 V, preventing damage to 130 V-rated LDOs and MCU power domains without adding series impedance. | Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Standoff protection element mounted at connector entry point, shunting transients before signal conditioning circuitry. Use Value: Sub-1 ns response ensures clamping occurs before transient energy reaches optocouplers or Schmitt triggers, preserving signal integrity. |
| DC Motor Drive Power Stage | Telecom Power Supply Input |
Use Scenario: Safeguarding H-bridge gate drivers and freewheeling diodes in brushed DC motor controllers subjected to back-EMF spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor supply rail to absorb inductive kickback energy. Use Value: 1500 W rating handles repetitive 100–500 ms inductive surges common in 100 W motor drives without thermal runaway. | Use Scenario: Front-end protection of 48 V telecom rectifier outputs exposed to lightning-induced surges on outdoor plant wiring. IC Role / Device Role / Timing Role: Primary clamping device upstream of bulk capacitors and DC/DC converters. Use Value: 70 V VWM aligns with nominal -48 V telecom systems (absolute value), while 113 V VC stays within -57 V to -75 V system tolerance bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC70A-E3/9AT | Lower PPPM (600 W), same VWM/VBR/VC, smaller SMA package | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy transients | Select when board space is constrained and surge threat level is ≤ Level 2 |
| SMCJ70CA-E3/9AT | Bidirectional variant; identical VWM/VBR/VC but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines where negative transients occur | Choose only if bidirectional protection is explicitly needed; not a drop-in replacement for unidirectional use |
Compared with SAC70A-E3/9AT and SMCJ70CA-E3/9AT, the SMCJ70A-E3/9AT delivers higher surge robustness in a standardized SMC footprint and is optimized for unidirectional DC rail protection-making it preferred for automotive and industrial power inputs where polarity is fixed and energy levels exceed 600 W.
Availability
SMCJ70A-E3/9AT is available at Aetrix Electronics and suitable for automotive ECU design, industrial motor drive development, and telecom power supply validation requiring stable component supply and traceable sourcing.
Supply support for SMCJ70A-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 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 part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh-environment applications including automotive, industrial automation, and telecommunications infrastructure.
FAQ
What is the clamping voltage of the SMCJ70A-E3/9AT under maximum rated surge?
The SMCJ70A-E3/9AT clamps to 113 V when subjected to its full 1500 W peak pulse power (10/1000 µs waveform), corresponding to a peak pulse current of 13.3 A. This value is measured and guaranteed per Vishay Document Number 88394, and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMCJ70A-E3/9AT maintains this clamping performance across its qualified operating temperature range.
Is the SMCJ70A-E3/9AT suitable for automotive applications?
The SMCJ70A-E3/9AT is RoHS-compliant and manufactured to commercial-grade specifications. For automotive use, Vishay offers the AEC-Q101 qualified variant SMCJ70AHE3_A/I (with HE3 suffix), which undergoes additional stress testing per automotive reliability standards. The SMCJ70A-E3/9AT itself is not AEC-Q101 qualified, so the SMCJ70A-E3/9AT should be used only in non-safety-critical commercial or industrial contexts unless validated per customer-specific requirements.
What does the "E3/9AT" suffix indicate in SMCJ70A-E3/9AT?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads. The "9AT" indicates packaging in a 13-inch diameter plastic tape and reel, with a base quantity of 3500 units per reel. This format supports high-volume automated assembly and is documented in Vishay's ordering information table (Document Number 88394, page 3). The SMCJ70A-E3/9AT is fully compatible with standard SMT reflow profiles including J-STD-020 MSL Level 1.
How does the SMCJ70A-E3/9AT differ from bidirectional TVS diodes like SMCJ70CA-E3/9AT?
The SMCJ70A-E3/9AT is unidirectional and functions only for positive transients relative to ground, with a cathode band marking the high-side terminal. In contrast, the SMCJ70CA-E3/9AT is bidirectional and suppresses surges of either polarity, with no polarity marking. Their VWM, VBR, and VC values are identical in magnitude, but the SMCJ70A-E3/9AT cannot protect against negative-going transients. Using the SMCJ70A-E3/9AT in place of a bidirectional part may leave circuits vulnerable to reverse-polarity events.
What is the thermal resistance of the SMCJ70A-E3/9AT, and how does it affect layout?
The SMCJ70A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended pad layout, and 15 °C/W junction-to-lead (RθJL). To maintain safe operation under repeated surges, PCB layout must provide adequate copper area: Vishay specifies 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Insufficient copper will elevate junction temperature, reducing surge endurance and accelerating parameter drift. The SMCJ70A-E3/9AT relies on this thermal path for reliable long-term performance.
SMCJ70A-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:
- 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 (SMCJ)
SMCJ70A-E3/9AT FAQ
1.How can I place an order for SMCJ70A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70A-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 SMCJ70A-E3/9AT reliable?
The price and inventory of SMCJ70A-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 SMCJ70A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ70A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70A-E3/9AT?
SMCJ70A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70A-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 SMCJ70A-E3/9AT?
For technical support, including SMCJ70A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70A-E3/9AT requirements.
6.How does Aetrix verify that SMCJ70A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ70A-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 SMCJ70A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ70A-E3/9AT?
All SMCJ70A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70A-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 SMCJ70A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ70A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ70A-E3/9AT Tags
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