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Vishay General Semiconductor - Diodes Division SMCJ78AHE3_A/I
- Part No.:
- SMCJ78AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78AHE3_A/I.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,358
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Product details
Overview
SMCJ78AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection. It features a 78 V standoff voltage (VWM), 86.7–95.8 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), and clamps transients to ≤126 V at 11.9 A IPPM. It is AEC-Q101 qualified and used to protect automotive power rails and industrial sensor interfaces against inductive switching surges.
For engineers reviewing the SMCJ78AHE3_A/I datasheet, SMCJ78AHE3_A/I pinout, SMCJ78AHE3_A/I application, or SMCJ78AHE3_A/I equivalent, this page delivers verified electrical parameters, thermal behavior, polarity marking, RoHS-compliant AEC-Q101 qualification status, and direct alternative part comparisons - all validated against Vishay's official 09-Jan-2024 revision of document 88394.
Technical Context
The SMCJ78AHE3_A/I operates as a unidirectional clamping device with glass-passivated junction and low incremental surge resistance. Its 1500 W peak pulse rating is specified under standardized 10/1000 µs waveform conditions, and it maintains stable clamping performance up to TJ = 150 °C with derating above TA = 25 °C per Figure 2.
It exhibits a temperature coefficient of VBR at +0.106 %/°C and a typical junction-to-lead thermal resistance of 15 °C/W. Polarity is marked by a cathode band on the SMC package, and its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working limit across protected line. |
| VBR min/max | 86.7 V / 95.8 V at IT = 1 mA - guaranteed breakdown onset range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | ≤126 V at 11.9 A - clamped voltage during full 1500 W surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W - peak transient energy absorption capability under 10/1000 µs waveform; enables robust protection against ISO 7637-2 Pulse 1/2/5a/b. |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| RθJL | 15 °C/W - low junction-to-lead thermal resistance; allows effective heat transfer to PCB copper pads without external heatsink. |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per AEC standard. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads. Cathode identified by molded band on body end. Complies with UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction (e.g., during surge clamp in reverse-biased configuration) | Connected to protected line side; must be routed with low-inductance trace to minimize overshoot during fast transients. |
| Cathode | Current exit terminal during reverse-biased clamping operation | Marked by band; connected to ground or lower-potential reference; determines unidirectional polarity orientation on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive powertrain and chassis applications requiring extended temperature cycling and long-term reliability. |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives; improves surge lifetime consistency. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., load dump, inductive kickback), improving system-level immunity. |
| MSL Level 1 rating | Allows unlimited floor life and reflow compatibility up to 260 °C peak, eliminating bake requirements prior to assembly. |
| 1500 W peak pulse power | Supports single-event surge suppression exceeding ISO 16750-2 Category 5a (12 V systems) and IEC 61000-4-5 Level 4. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges above 78 V. Use Value: Limits peak voltage to ≤126 V during 11.9 A surge, preventing damage to LDOs, microcontrollers, and CAN transceivers. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC modules. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt ESD and cable discharge events. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) within nanoseconds while maintaining <1 µA leakage at 78 V operating bias. |
| Telecom DC Power Input Protection | Motor Drive Control Signal Protection |
|
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: Unidirectional suppressor referenced to system ground, absorbing differential-mode transients. Use Value: Withstands 1500 W pulses without degradation, enabling compliance with GR-1089-CORE Section 4.5.2.2. |
Use Scenario: Shielding gate driver enable/disable signals from MOSFET/IGBT switching noise coupling. IC Role / Device Role / Timing Role: Localized TVS on control PCB near optocoupler or level-shifter inputs. Use Value: Sub-10 ns response time prevents false triggering of half-bridge drivers during high dv/dt edge transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78AHE3_A/I | Lower PPPM (600 W), same VWM/VBR range, SMB (DO-214AA) package with smaller pad area and higher RθJA (110 °C/W). | Suitable for space-constrained consumer electronics where 1500 W surge margin is not required. | Select when board area is limited and surge threat level is moderate (e.g., USB-powered devices). |
| SMCJ78CAHE3_A/I | Bidirectional variant with identical VWM/VBR specs but symmetrical clamping in both polarities; same 1500 W rating and SMC package. | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, CAN FD). | Choose only if bidirectional protection is mandated; otherwise SMCJ78AHE3_A/I offers lower cost and simpler layout. |
Compared with SMBJ78AHE3_A/I, the SMCJ78AHE3_A/I delivers 2.5× higher surge power handling and superior thermal dissipation; versus SMCJ78CAHE3_A/I, it provides optimized unidirectional clamping with reduced capacitance and lower leakage, making it preferable for DC power rail protection.
Availability
SMCJ78AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom power supply hardening requiring stable component supply and AEC-Q101 traceability.
Supply support for SMCJ78AHE3_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 automotive-grade qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where robustness and long-term stability are critical.
FAQ
What is the clamping voltage of the SMCJ78AHE3_A/I at its rated peak pulse current?
The SMCJ78AHE3_A/I clamps to a maximum of 126 V when subjected to its rated peak pulse current of 11.9 A under the standard 10/1000 µs waveform. This value is measured at the device terminals with recommended 0.31" × 0.31" copper pads per Vishay document 88394, ensuring realistic system-level protection margins for downstream components like microcontrollers and power management ICs. The SMCJ78AHE3_A/I maintains this clamping performance across its full operating temperature range.
Is the SMCJ78AHE3_A/I suitable for automotive applications?
Yes, the SMCJ78AHE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix indicating RoHS-compliant and AEC-Q101 qualified construction. It meets requirements for under-hood and chassis-mounted modules exposed to temperature cycling, humidity, and high-energy transients such as load dump and jump-start events. The SMCJ78AHE3_A/I is commonly deployed in body control modules, ADAS power supplies, and infotainment system inputs.
How does the SMCJ78AHE3_A/I differ from the bidirectional SMCJ78CAHE3_A/I?
The SMCJ78AHE3_A/I is unidirectional with cathode-band polarity marking and optimized for DC line protection, whereas the SMCJ78CAHE3_A/I is bidirectional with no polarity marking and symmetric clamping in both directions. Both share identical VWM (78 V), VBR (86.7–95.8 V), and PPPM (1500 W), but the SMCJ78AHE3_A/I exhibits lower reverse leakage (<1 µA at 78 V) and slightly lower junction capacitance - advantages for DC power rail applications where leakage and noise coupling matter. The SMCJ78AHE3_A/I cannot replace SMCJ78CAHE3_A/I in AC or floating-signal roles.
What is the thermal resistance specification for the SMCJ78AHE3_A/I?
The SMCJ78AHE3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W, measured under standard test conditions per JEDEC. This low value enables efficient heat transfer from the silicon die to the PCB copper pads without requiring additional heatsinking. Its junction-to-ambient thermal resistance (RθJA) is 75 °C/W when mounted on minimum recommended pad layout, supporting reliable operation up to +150 °C junction temperature. These values are confirmed in Vishay document 88394, section "THERMAL CHARACTERISTICS".
What packaging and reel options are available for the SMCJ78AHE3_A/I?
The SMCJ78AHE3_A/I is supplied in 13" diameter plastic tape and reel format (package code "I") with a base quantity of 3500 units per reel, as specified in Vishay's ordering information table. The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified construction, while "_A/I" indicates the specific reel configuration. Tape-and-reel packaging ensures compatibility with high-speed automated pick-and-place equipment and supports IPC/JEDEC standard handling protocols. The SMCJ78AHE3_A/I is not offered in bulk or tube formats.
SMCJ78AHE3_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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ78AHE3_A/I FAQ
1.How can I place an order for SMCJ78AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78AHE3_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 SMCJ78AHE3_A/I reliable?
The price and inventory of SMCJ78AHE3_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 SMCJ78AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ78AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78AHE3_A/I?
SMCJ78AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78AHE3_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 SMCJ78AHE3_A/I?
For technical support, including SMCJ78AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78AHE3_A/I requirements.
6.How does Aetrix verify that SMCJ78AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ78AHE3_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 SMCJ78AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ78AHE3_A/I?
All SMCJ78AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78AHE3_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 SMCJ78AHE3_A/I part is unused and in its original packaging.
Return procedure for SMCJ78AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ78AHE3_A/I Tags
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