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Vishay General Semiconductor - Diodes Division SMCJ78C-E3/9AT
- Part No.:
- SMCJ78C-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78C-E3/9AT.pdf
- Description:
- TVS DIODE 78VWM 139VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,157
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Product details
Overview
SMCJ78C-E3/9AT from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for clamping voltage transients on signal or 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 (PPPM) with 10/1000 µs waveform - suitable for automotive sensor line protection and industrial I/O interface surge suppression.
For engineers reviewing the SMCJ78C-E3/9AT datasheet, SMCJ78C-E3/9AT pinout, SMCJ78C-E3/9AT application, or SMCJ78C-E3/9AT equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, DO-214AB mechanical data, thermal resistance values, and real-world design implications for transient immunity in 12–24 V systems.
Technical Context
The SMCJ78C-E3/9AT operates as a bi-directional avalanche diode, with symmetrical breakdown characteristics in both polarities - enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable VBR (86.7–95.8 V) and low incremental surge resistance, critical for consistent clamping under repetitive transients.
Designed for surface-mount automated assembly, it meets MSL level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak. With a junction-to-lead thermal resistance (RθJL) of 15 °C/W and TJ max of +150 °C, it sustains high-energy surges while maintaining reliability in thermally constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 78 V - maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR min/max | 86.7 V / 95.8 V at 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on across temperature and unit variation |
| VC @ IPPM | 126 V at 11.9 A (10/1000 µs) - peak clamped voltage seen by protected circuit; determines residual stress on downstream ICs |
| PPPM | 1500 W - energy-handling capacity for standardized surge waveforms; enables compliance with ISO 7637-2 Pulse 1/2a/5a |
| ID @ VWM | 1.0 µA - ultra-low reverse leakage at rated stand-off; minimizes standby power loss in battery-powered systems |
| TJ max | +150 °C - maximum junction temperature rating; supports operation in under-hood automotive environments |
| RθJA / RθJL | 75 °C/W / 15 °C/W - thermal resistances defining power derating behavior; guides heatsinking and pad layout decisions |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, bi-directional configuration with no polarity marking - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; connects across protected line and ground (or between differential lines) without orientation dependency |
| Case (cathode band absent) | Mechanical reference / thermal path | No functional polarity; case serves as primary heat sink interface via copper pad; requires 8.0 mm × 8.0 mm minimum pad per terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| Bi-directional symmetry | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware placement in AC or floating circuits |
| Low incremental surge resistance | Enables tighter clamping window (VC − VBR ≈ 38–40 V), reducing overvoltage exposure during fast transients |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT processes without pre-baking or special handling |
| Glass-passivated junction | Ensures long-term stability of breakdown voltage and leakage performance under thermal cycling and humidity stress |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional TVS placed between signal line and chassis ground to clamp ±100 V transients within 1 ns response time. Use Value: Maintains signal integrity below 126 V clamping level while surviving ISO 7637-2 Pulse 5a (100 V/2 Ω/40 ms), preventing microcontroller reset or ADC saturation. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-rated TVS across input terminal and common rail, absorbing 1500 W pulses without degradation. Use Value: Enables >100,000 surge cycles per IEC 61000-4-5 Level 4 (4 kV) due to low Rsurge and robust junction construction. |
| Telecom Line Interface | Consumer Power Adapter ESD Clamp |
Use Scenario: Secondary-side transient suppression on Ethernet PHY power rails or RS-485 bias networks exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bi-directional clamping device bridging VCC_IO and GND to limit common-mode overvoltage during surge events. Use Value: Delivers 126 V clamping at 11.9 A with <1 ns response, meeting GR-1089-CORE telecom immunity requirements for NEBS Level 3. |
Use Scenario: Input-stage ESD and surge protection for USB-C PD adapters and multi-port chargers operating from 12–24 V DC inputs. IC Role / Device Role / Timing Role: Primary-line TVS between adapter input and ground, absorbing IEC 61000-4-2 contact discharge (±8 kV) and surge events. Use Value: Combines 78 V stand-off with 1500 W PPPM to protect upstream DC-DC controllers without crowbar triggering or latch-up risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC78C-TB | Same VWM (78 V), lower PPPM (1000 W), higher VC (135 V at 8.5 A), DO-214AB package | Lower energy handling limits use in ISO 7637-2 Pulse 5a; suited for cost-sensitive consumer-grade designs | Select when 1000 W surge rating suffices and AEC-Q101 is not required |
| SMCJ78CAHE3/9AT | Identical electrical specs, but AEC-Q101 qualified and JESD201 Class 2 whisker-tested (HE3 suffix) | Required for automotive safety-critical modules where extended reliability validation is mandated | Choose for ASIL-B systems or production programs requiring full automotive qualification documentation |
Compared with SAC78C-TB and SMCJ78CAHE3/9AT, the SMCJ78C-E3/9AT offers balanced performance for industrial and Tier-2 automotive use - delivering full 1500 W surge capability and commercial-grade AEC-Q101 compliance without the extended test overhead of HE3 variants.
Availability
SMCJ78C-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line cards, and consumer power adapter designs requiring stable component supply and RoHS-compliant packaging.
Supply support for SMCJ78C-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 and application-specific optimization.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be rigorously controlled.
FAQ
What is the clamping voltage of the SMCJ78C-E3/9AT under a 10/1000 µs surge?
The SMCJ78C-E3/9AT has a maximum clamping voltage (VC) of 126 V when subjected to its rated peak pulse current of 11.9 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and reflects the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the SMCJ78C-E3/9AT suitable for automotive applications?
Yes, the SMCJ78C-E3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its DO-214AB package, 150 °C junction rating, and validated performance under ISO 7637-2 transients make it appropriate for under-hood and cabin-mounted systems where reliability under thermal and electrical stress is mandatory.
Does the SMCJ78C-E3/9AT have polarity markings?
No, the SMCJ78C-E3/9AT is a bi-directional TVS diode and carries no cathode band or polarity marking. Its symmetrical construction means either terminal may connect to the line or ground side of the protected circuit - simplifying layout and eliminating orientation errors during automated placement.
What is the thermal resistance of the SMCJ78C-E3/9AT?
The SMCJ78C-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W, measured on recommended 8.0 mm × 8.0 mm copper pads. These values directly inform power derating above 25 °C ambient and guide thermal pad design to maintain TJ ≤ 150 °C during repeated surge events.
How does the SMCJ78C-E3/9AT differ from the uni-directional SMCJ78A-E3/9AT?
The SMCJ78C-E3/9AT is bi-directional with symmetrical breakdown and clamping in both polarities, while the SMCJ78A-E3/9AT is uni-directional and requires correct anode/cathode orientation. The 'C' suffix denotes bi-directionality per Vishay's naming convention; electrically, the SMCJ78C-E3/9AT has identical VWM (78 V) and PPPM (1500 W) but lacks forward voltage (VF) specification since it conducts equally in both directions.
SMCJ78C-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:
- 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-E3/9AT FAQ
1.How can I place an order for SMCJ78C-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78C-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 SMCJ78C-E3/9AT reliable?
The price and inventory of SMCJ78C-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 SMCJ78C-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ78C-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78C-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78C-E3/9AT?
SMCJ78C-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78C-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 SMCJ78C-E3/9AT?
For technical support, including SMCJ78C-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78C-E3/9AT requirements.
6.How does Aetrix verify that SMCJ78C-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ78C-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 SMCJ78C-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ78C-E3/9AT?
All SMCJ78C-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78C-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 SMCJ78C-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ78C-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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