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Vishay General Semiconductor - Diodes Division SMCJ78AHE3_A/H
- Part No.:
- SMCJ78AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78AHE3_A/H.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,747
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Product details
Overview
SMCJ78AHE3_A/H 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 with 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). It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and lightning-induced surges in automotive and industrial power rails.
For engineers reviewing the SMCJ78AHE3_A/H datasheet, SMCJ78AHE3_A/H pinout, SMCJ78AHE3_A/H application, or SMCJ78AHE3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ78AHE3_A/H operates as a unidirectional avalanche diode that clamps transient overvoltages above its breakdown voltage range (86.7–95.8 V at 1 mA test current) while maintaining low leakage (<1.0 μA at 78 V). Its glass-passivated junction ensures stable performance under repetitive surge stress and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
It delivers 1500 W peak pulse power handling with a 10/1000 μs waveform, supported by a thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling robust operation without external heatsinking in typical PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 86.7 V / 95.8 V at 1 mA - Ensures reliable turn-on margin above VWM for noise immunity |
| VC @ IPPM | 126 V at 11.9 A - Clamped voltage during 1500 W surge, limiting downstream device stress |
| PPPM | 1500 W - Peak transient energy absorption capability with 10/1000 μs waveform |
| ID @ VWM | <1.0 μA - Ultra-low leakage preserves system standby power integrity |
| TJ max | +150 °C - Enables use in under-hood automotive and high-temperature industrial environments |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 8.13 mm × 6.22 mm footprint |
Pinout & Package
SMCJ78AHE3_A/H uses the SMC (DO-214AB) package: a surface-mount, molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102, rated UL 94 V-0, and qualified to MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient clamp output node | Connected to protected line; conducts during overvoltage to shunt current to ground |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal and electrical stress |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving protection margin for sensitive ICs |
| MSL Level 1 rating | Allows standard SMT reflow without moisture sensitivity concerns or baking requirements |
| 1500 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge compliance in properly designed circuits |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs and body control modules from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges exceeding 78 V. Use Value: Limits clamped voltage to 126 V, preventing damage to 36 V-rated DC-DC converters and microcontrollers. | Use Scenario: Safeguarding analog front-end inputs of pressure, temperature, or position sensors in factory automation systems. IC Role / Device Role / Timing Role: TVS connected across differential or single-ended sensor lines to suppress ESD and cable discharge events. Use Value: Sub-1 μA leakage at 78 V avoids signal offset errors in precision 24-bit ADC interfaces. |
| Telecom Power Supply Input | Motor Drive Gate Driver Protection |
Use Scenario: Input-stage surge suppression for AC/DC and DC/DC converters in base station power supplies. IC Role / Device Role / Timing Role: Primary-side TVS on bulk input rail to absorb lightning-induced surges per IEC 61000-4-5. Use Value: 1500 W PPPM rating enables single-device compliance with 4 kV open-circuit surge tests. | Use Scenario: Clamping gate-source voltage spikes on N-channel MOSFETs in BLDC motor inverters. IC Role / Device Role / Timing Role: TVS placed between gate and source to limit dV/dt-induced false turn-on and oxide stress. Use Value: Fast response time and low clamping voltage (126 V) prevent gate oxide breakdown during switching transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ78A-E3/57T | Lower PPPM (400 W), same VWM (78 V), SMA package (smaller footprint, lower thermal mass) | Not suitable for 1500 W surge events; limited to lower-energy IEC 61000-4-2/4-5 applications | Select only when board space is constrained and surge threat level is ≤1 kV/42 Ω |
| SMCJ78CAHE3_A/H | Bidirectional variant; identical VWM (78 V), VC (126 V), and PPPM (1500 W); no polarity marking | Required for AC-coupled or dual-polarity signal lines where reverse conduction must be suppressed | Choose when protecting symmetric interfaces (e.g., RS-485, CAN bus) without defined DC bias |
Compared with SMAJ78A-E3/57T and SMCJ78CAHE3_A/H, the SMCJ78AHE3_A/H provides optimal balance of high-energy clamping, AEC-Q101 qualification, and unidirectional polarity for DC power rail protection-making it the preferred choice for automotive and industrial 78 V nominal systems requiring full 1500 W surge immunity.
Availability
SMCJ78AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and telecom power supply input stages requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ78AHE3_A/H 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 part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where sustained surge immunity and AEC-Q101 validation are mandatory.
FAQ
What is the breakdown voltage range of the SMCJ78AHE3_A/H?
The SMCJ78AHE3_A/H has a guaranteed breakdown voltage (VBR) range of 86.7 V to 95.8 V at 1 mA test current, measured per ANSI/IEEE C62.35. This ensures consistent clamping behavior above its 78 V stand-off voltage and provides sufficient margin against false triggering due to ripple or noise. The SMCJ78AHE3_A/H maintains this specification across its full operating temperature range of -55 °C to +150 °C.
Is the SMCJ78AHE3_A/H suitable for automotive applications?
Yes, the SMCJ78AHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix. It undergoes rigorous stress testing-including temperature cycling, highly accelerated life testing (HALT), and ESD qualification-to ensure reliability in engine control units, body electronics, and ADAS power domains. The SMCJ78AHE3_A/H meets all requirements for under-hood deployment up to +150 °C junction temperature.
What is the maximum clamping voltage of the SMCJ78AHE3_A/H at rated surge current?
The SMCJ78AHE3_A/H clamps to a maximum of 126 V at its rated peak pulse current of 11.9 A (10/1000 μs waveform). This value is guaranteed across production lots and temperature extremes, ensuring predictable protection for downstream components such as 100 V-rated MOSFETs or 36 V-input DC-DC controllers. The SMCJ78AHE3_A/H achieves this with low incremental surge resistance, minimizing overshoot during fast-rising transients.
Does the SMCJ78AHE3_A/H have a bidirectional counterpart?
Yes, the bidirectional counterpart is the SMCJ78CAHE3_A/H, which shares identical electrical ratings-including 78 V stand-off voltage, 126 V clamping voltage, and 1500 W peak pulse power-but lacks polarity marking and conducts in both directions. Unlike the SMCJ78AHE3_A/H, the SMCJ78CAHE3_A/H is used where AC signals or undefined polarity require symmetrical clamping, such as in RS-485 or CAN FD data lines.
What packaging and reel options are available for the SMCJ78AHE3_A/H?
The SMCJ78AHE3_A/H ships in 7-inch plastic tape-and-reel format (package code "H") with 850 units per reel, optimized for high-speed pick-and-place assembly. It features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and meets JESD 201 Class 2 whisker resistance. The SMCJ78AHE3_A/H is RoHS-compliant and halogen-free per Vishay's material categorization standards.
SMCJ78AHE3_A/H 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/H FAQ
1.How can I place an order for SMCJ78AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78AHE3_A/H 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/H reliable?
The price and inventory of SMCJ78AHE3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMCJ78AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78AHE3_A/H?
SMCJ78AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78AHE3_A/H 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/H?
For technical support, including SMCJ78AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78AHE3_A/H requirements.
6.How does Aetrix verify that SMCJ78AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ78AHE3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SMCJ78AHE3_A/H?
All SMCJ78AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78AHE3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SMCJ78AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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