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Vishay General Semiconductor - Diodes Division SMCJ78CAHE3_A/I
- Part No.:
- SMCJ78CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78CAHE3_A/I.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,697
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Product details
Overview
SMCJ78CAHE3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on power and signal lines. It features a 78 V standoff 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 - deployed in automotive ECUs, industrial I/O modules, and telecom power rails.
For engineers reviewing the SMCJ78CAHE3_A/I datasheet, SMCJ78CAHE3_A/I pinout, SMCJ78CAHE3_A/I application, or SMCJ78CAHE3_A/I equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), junction temperature range (–55 to +150 °C), and bidirectional clamping behavior critical for robust overvoltage design in harsh environments.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while the low incremental surge resistance supports fast energy dissipation during ESD or lightning-induced transients.
The device meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow compatibility and is AEC-Q101 qualified (indicated by HE3 suffix), making it suitable for under-hood automotive applications where thermal cycling and long-term reliability are mandatory. Its 1500 W PPPM rating applies across the full operating temperature range when mounted on 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown |
| VBR min/max | 86.7 V / 95.8 V at IT = 1.0 mA - guaranteed breakdown threshold window ensuring consistent turn-on behavior |
| VC @ IPPM | 126 V at 11.9 A - clamping voltage under 10/1000 μs surge; determines protected circuit's maximum transient exposure |
| PPPM | 1500 W - peak pulse power handling capability; enables survival of high-energy transients like ISO 7637-2 Pulse 5a |
| TJ max | +150 °C - maximum junction temperature; supports operation in engine bay or industrial enclosures without derating |
| RθJA | 75 °C/W - thermal resistance junction-to-ambient; informs PCB copper pad sizing and airflow requirements for sustained power dissipation |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking - terminals are symmetrical anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current from either direction; connects to protected line or ground reference depending on layout |
| Cathode | Transient current exit (bidirectional) | Completes low-impedance path to ground or return rail during clamping; functionally identical to Anode in CA devices |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without polarity constraints |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock - required for ECU, ADAS, and body control modules |
| 1500 W peak pulse power | Withstands ISO 7637-2 Pulse 5a (load dump) surges up to 120 V/300 ms without degradation when properly heatsinked |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes voltage overshoot during transients - critical for protecting 80 V-rated MOSFETs or 100 V input DC/DC controllers |
| MSL Level 1, 260 °C compatible | Supports standard lead-free reflow profiles without moisture sensitivity concerns - eliminates bake requirements pre-assembly |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump and jump-start transients per ISO 7637-2. IC Role / Device Role / Timing Role: Primary shunt clamp placed between power rail and chassis ground to divert surge energy away from downstream regulators and microcontrollers. Use Value: Clamps to 126 V within nanoseconds, limiting stress on 36 V-input PMICs and preserving system uptime during harsh vehicle events. |
Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) in PLC I/O modules exposed to field wiring transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential signal pairs (e.g., 4–20 mA loop) to suppress EFT and surge without distorting DC accuracy. Use Value: Sub-1.0 μA leakage at 78 V ensures minimal offset error; symmetrical clamping prevents signal inversion during bipolar transients. |
| Telecom DC Power Input Protection | Motor Drive Control Signal Isolation |
|
Use Scenario: Securing –48 V telecom rectifier outputs against lightning-induced surges entering central office equipment. IC Role / Device Role / Timing Role: Standoff-rated TVS installed upstream of DC/DC converters to absorb multi-kW surges before they propagate into sensitive logic. Use Value: 1500 W PPPM rating exceeds GR-1089-CORE Category A requirements; 150 °C TJ rating sustains performance in sealed cabinets. |
Use Scenario: Shielding isolated gate drivers (e.g., SiC MOSFETs) from Miller-induced dv/dt spikes and shoot-through risks in servo drives. IC Role / Device Role / Timing Role: Fast-response TVS on gate drive supply rails to clamp ringing above 78 V before driver IC damage occurs. Use Value: 126 V clamping voltage provides ≥15 V margin below typical 135 V absolute max ratings of isolated gate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC78CA | Same VWM (78 V) and VC (126 V), but lower PPPM (600 W); smaller SMA package (DO-214AC) | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); unsuitable for ISO 7637-2 load dump | Select when board space is constrained and surge threat level is limited to human-body-model ESD or low-energy switching noise |
| SMCJ78CAHM3_A/I | Identical electrical specs and AEC-Q101 qualification; differs only in halogen-free RoHS compliance (HM3 vs HE3) | No functional difference; used where halogen-free material declaration is mandated by OEM or regional regulation | Choose HM3 variant if compliance with JEDEC J-STD-609 Class 2a (halogen-free) is contractually required |
Compared with SAC78CA, SMCJ78CAHE3_A/I delivers 2.5× higher surge power handling and automotive qualification; versus SMCJ78CAHM3_A/I, it offers identical protection performance with standard RoHS compliance - making it the default choice for cost-sensitive AEC-Q101 designs without halogen restrictions.
Availability
SMCJ78CAHE3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial I/O systems, and telecom infrastructure requiring stable component supply, long-lifecycle support, and AEC-Q101 traceability.
Supply support for SMCJ78CAHE3_A/I 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 is engineered for high-power transient suppression in demanding environments - targeting automotive, industrial, and telecom applications where robustness against voltage surges is non-negotiable.
FAQ
What is the clamping voltage of SMCJ78CAHE3_A/I at its rated peak pulse current?
The SMCJ78CAHE3_A/I has a maximum clamping voltage (VC) of 126 V when subjected to its specified peak pulse current (IPPM) of 11.9 A using the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ78CAHE3_A/I maintains this clamping performance across its full operating temperature range when mounted per recommended pad layout.
Is SMCJ78CAHE3_A/I suitable for automotive applications?
Yes, SMCJ78CAHE3_A/I is AEC-Q101 qualified, as confirmed by the "HE3" suffix and Vishay documentation. It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD validation - making it appropriate for under-hood ECUs, body control modules, and ADAS power supplies. The SMCJ78CAHE3_A/I also meets MSL Level 1 and supports lead-free reflow, fulfilling key automotive manufacturing requirements.
How does the bidirectional design of SMCJ78CAHE3_A/I affect its circuit placement?
The bidirectional nature of SMCJ78CAHE3_A/I means it has no polarity marking and functions identically in either orientation - ideal for protecting AC-coupled lines, differential buses (e.g., CAN, RS-485), or floating power domains. Unlike unidirectional TVS diodes, the SMCJ78CAHE3_A/I can be placed across any two nodes without regard to voltage polarity, simplifying layout and eliminating risk of reverse installation during assembly.
What is the thermal resistance of SMCJ78CAHE3_A/I, and how does it impact PCB layout?
The SMCJ78CAHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended 8.0 mm × 8.0 mm copper pads per terminal. To maintain safe junction temperatures during repetitive surges or elevated ambient conditions, designers must allocate sufficient copper area and consider airflow. Reducing RθJA via larger pads or internal planes directly improves the SMCJ78CAHE3_A/I's ability to sustain multiple transient events without thermal runaway.
Does SMCJ78CAHE3_A/I meet UL recognition standards?
Yes, SMCJ78CAHE3_A/I carries Underwriters Laboratories recognition under UL 497B (QVGQ2) for protector classification, with file number E136766 covering both unidirectional and bidirectional variants. This certification confirms compliance with safety requirements for transient voltage protection devices used in telecommunications and industrial equipment - supporting regulatory submissions where UL listing is mandatory for end-product approval.
SMCJ78CAHE3_A/I 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):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 126V
- Current - Peak Pulse (10/1000µs):
- 11.9A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ78CAHE3_A/I FAQ
1.How can I place an order for SMCJ78CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78CAHE3_A/I 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 SMCJ78CAHE3_A/I reliable?
The price and inventory of SMCJ78CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ78CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ78CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78CAHE3_A/I?
SMCJ78CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78CAHE3_A/I 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 SMCJ78CAHE3_A/I?
For technical support, including SMCJ78CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78CAHE3_A/I requirements.
6.How does Aetrix verify that SMCJ78CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ78CAHE3_A/I 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 SMCJ78CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ78CAHE3_A/I?
All SMCJ78CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78CAHE3_A/I, 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 SMCJ78CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMCJ78CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ78CAHE3_A/I Tags
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