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Vishay General Semiconductor - Diodes Division SMCJ78C-E3/57T
- Part No.:
- SMCJ78C-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78C-E3/57T.pdf
- Description:
- TVS DIODE 78VWM 139VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,899
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Product details
Overview
SMCJ78C-E3/57T from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection on signal and power lines. It features a 78 V stand-off voltage (VWM), 126 V maximum clamping voltage (VC) at 11.9 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMCJ78C-E3/57T datasheet, SMCJ78C-E3/57T pinout, SMCJ78C-E3/57T application, or SMCJ78C-E3/57T equivalent, key selection criteria include verified bi-directional clamping performance, AEC-Q101 qualification, RoHS-compliant matte tin plating, and DO-214AB thermal derating behavior above 25 °C ambient.
Technical Context
The SMCJ78C-E3/57T operates as a bi-directional avalanche diode, with symmetrical breakdown characteristics (VBR min = 86.7 V, max = 95.8 V at IT = 1 mA) enabling identical clamping in both polarities. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ps), critical for suppressing ESD and inductive switching transients.
Thermally, it exhibits RθJA = 75 °C/W (typ.) and RθJL = 15 °C/W (typ.), supporting operation from –55 °C to +150 °C junction temperature. The device is rated for 1500 W peak pulse power under standardized 10/1000 µs waveform, with derating above TA = 25 °C per Figure 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse stand-off voltage before significant conduction begins |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - guaranteed symmetric breakdown threshold in both directions |
| VC @ IPPM | 126 V at 11.9 A - clamping voltage limiting downstream circuit stress during surge events |
| PPPM | 1500 W - peak transient energy handling capability with 10/1000 µs waveform |
| ID @ VWM | ≤1.0 µA - ultra-low leakage preserving signal integrity in high-impedance circuits |
| TJ max. | +150 °C - enables use in under-hood automotive and industrial environments |
| Package | DO-214AB (SMCJ) - surface-mount, MSL Level 1, 260 °C reflow compatible |
Pinout & Package
DO-214AB (SMCJ) package: low-profile, molded plastic case with J-bend leads; no polarity marking for bi-directional devices; matte tin-plated terminals compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche junction | No functional distinction - terminals interchangeable; clamps equally for positive or negative transients |
| Case (body) | Non-electrical mechanical interface | Thermally conductive path to PCB copper pads (8.0 mm × 8.0 mm recommended per terminal) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47 |
| Glass-passivated junction | Ensures stable VBR and low leakage across lifetime and environmental stress |
| MSL Level 1 rating | Supports standard SMT reflow without moisture sensitivity concerns (peak 260 °C) |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = ~1.45) versus competing TVS diodes |
| RoHS-compliant, whisker-tested (JESD201 Class 1A) | E3 suffix confirms matte tin plating meets stringent reliability requirements for long-life electronics |
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: Bi-directional clamping element placed directly at connector entry point to shunt transients before reaching sensitive ICs. Use Value: Withstands 1500 W surges while clamping to ≤126 V, preventing damage to 5 V or 12 V rail interfaces without adding series impedance. | Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring induced transients and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across input terminals to absorb repetitive 10/1000 µs surges up to 11.9 A without degradation. Use Value: Maintains ≤1.0 µA leakage at 78 V, ensuring compatibility with high-impedance 24 V DC sensing circuits and avoiding false triggering. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Shielding Ethernet PHY front-end and PoE injectors from lightning-induced surges and AC line coupling. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side DC lines, coordinated with upstream GDT or MOV for staged protection. Use Value: Fast <1 ps response captures sub-microsecond transients; DO-214AB footprint allows placement within 2 mm of connector for minimal loop inductance. | Use Scenario: Adding secondary-side surge immunity to USB-C PD and Qi wireless charging adapters exposed to user-handling ESD. IC Role / Device Role / Timing Role: Bi-directional clamp on VBUS and CC lines to meet IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact). Use Value: AEC-Q101 qualification ensures robustness across thermal cycles and humidity exposure typical in consumer power supply enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CA-E3/52T | Lower PPPM (600 W), smaller SMB package (DO-214AA), higher VC (127 V at 9.8 A) | Reduced surge margin; suitable only for lower-energy transients or space-constrained layouts | Select when board area is critical and peak surge energy remains below 600 W |
| SMCJ78AHE3/57T | Uni-directional variant; same VWM (78 V), VC (126 V), PPPM (1500 W); includes cathode band marking | Requires correct polarity orientation; not usable in AC-coupled or floating lines | Choose only for DC rails where polarity is fixed and unidirectional clamping suffices |
Compared with SMCJ78C-E3/57T, SMBJ78CA-E3/52T trades surge capacity for compactness, while SMCJ78AHE3/57T offers identical clamping but mandates polarity-aware layout - making SMCJ78C-E3/57T the optimal choice for bi-directional, high-energy, automotive-qualified protection without polarity constraints.
Availability
SMCJ78C-E3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer power adapter designs requiring stable component supply and AEC-Q101 compliance.
Supply support for SMCJ78C-E3/57T 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 belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom systems demanding AEC-Q101 validation and repeatable clamping performance.
FAQ
What is the clamping voltage of the SMCJ78C-E3/57T under standard test conditions?
The SMCJ78C-E3/57T has a maximum clamping voltage (VC) of 126 V when subjected to its rated peak pulse current (IPPM) of 11.9 A using the 10/1000 µs waveform. This value is measured across the device terminals during transient suppression and defines the upper voltage limit imposed on protected circuitry during surge events.
Is the SMCJ78C-E3/57T suitable for automotive applications?
Yes, the SMCJ78C-E3/57T is AEC-Q101 qualified and explicitly rated for automotive use. Its construction - including glass-passivated junction, matte tin plating (JESD201 Class 1A), and operating temperature range of –55 °C to +150 °C - meets the reliability requirements for under-hood and chassis-mounted electronics. The SMCJ78C-E3/57T appears in Vishay's automotive-grade ordering matrix with HE3 suffix variants confirming qualification.
How does the bi-directional design of the SMCJ78C-E3/57T affect its circuit implementation?
The bi-directional architecture of the SMCJ78C-E3/57T eliminates polarity sensitivity: either terminal may connect to line or ground without functional impact. This simplifies layout in AC-coupled, differential, or floating interfaces - such as CAN bus lines or telecom signal pairs - where voltage transients can swing positive or negative relative to reference. No cathode band marking is present on the SMCJ78C-E3/57T, consistent with its symmetrical operation.
What is the thermal resistance profile of the SMCJ78C-E3/57T, and how does it influence PCB layout?
The SMCJ78C-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W. To maintain safe junction temperatures under repeated surges, Vishay specifies mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Reducing pad area or omitting thermal vias increases thermal impedance, accelerating derating - especially above TA = 25 °C, per Figure 2 in the SMCJ78C-E3/57T datasheet.
Does the SMCJ78C-E3/57T meet RoHS and lead-free assembly requirements?
Yes, the SMCJ78C-E3/57T carries the "E3" suffix, indicating full RoHS compliance per Directive 2011/65/EU and suitability for lead-free reflow processes. Its matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability standards, and it passes JESD201 Class 1A whisker testing - confirming long-term reliability in Pb-free manufacturing environments without risk of tin whisker growth.
SMCJ78C-E3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 139V
- Current - Peak Pulse (10/1000µs):
- 10.8A
- 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)
SMCJ78C-E3/57T FAQ
1.How can I place an order for SMCJ78C-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78C-E3/57T 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 SMCJ78C-E3/57T reliable?
The price and inventory of SMCJ78C-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ78C-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ78C-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78C-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78C-E3/57T?
SMCJ78C-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78C-E3/57T 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 SMCJ78C-E3/57T?
For technical support, including SMCJ78C-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78C-E3/57T requirements.
6.How does Aetrix verify that SMCJ78C-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ78C-E3/57T 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 SMCJ78C-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ78C-E3/57T?
All SMCJ78C-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78C-E3/57T, 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 SMCJ78C-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ78C-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ78C-E3/57T Tags
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