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Vishay General Semiconductor - Diodes Division SMCG78AHE3/9AT
- Part No.:
- SMCG78AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG78AHE3/9AT.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,830
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Product details
Overview
SMCG78AHE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 78 V stand-off voltage (VWM), 86.7–95.8 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (PPPM), 11.9 A peak pulse current (IPPM), and clamps to ≤126 V at rated surge. It is AEC-Q101 qualified and used in automotive power line and sensor interface protection.
For engineers reviewing the SMCG78AHE3/9AT datasheet, SMCG78AHE3/9AT pinout, SMCG78AHE3/9AT application, or SMCG78AHE3/9AT equivalent, key selection criteria include unidirectional polarity, DO-215AB thermal performance (RθJA = 75 °C/W), 1500 W 10/1000 µs surge rating, AEC-Q101 qualification, and RoHS-compliant HE3 suffix marking.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the low incremental surge resistance enables effective energy diversion during transients.
The SMCG78AHE3/9AT is optimized for 10/1000 µs surge waveforms per ANSI/IEEE C62.35, with thermal design based on 0.31" × 0.31" copper pads per terminal. Its MSL Level 1 rating and 260 °C lead-free reflow compatibility support automated SMT assembly in high-reliability automotive and industrial environments.
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 - Confirmed breakdown range ensuring reliable turn-on margin above VWM |
| VC @ IPPM | ≤126 V - Clamping voltage under full 1500 W surge, limiting stress on downstream ICs |
| PPPM | 1500 W - Peak pulse power handling capability for 10/1000 µs waveform per IEC 61000-4-5 |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - Junction temperature limit enabling operation in under-hood automotive environments |
| RθJA | 75 °C/W - Thermal resistance defining required PCB copper area for sustained power dissipation |
Pinout & Package
Package: SMCG (DO-215AB) - surface-mount, low-profile, gull-wing leaded case with matte tin-plated terminals compliant with J-STD-002 and JESD 22-B102 solderability standards. Cathode indicated by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to ground or low-side reference | Provides return path during clamping; must be routed with low-inductance ground plane |
| Cathode | Current exit point in forward bias; connected to protected line | Band-marked terminal; connects to signal/power line requiring transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Glass passivated junction | Ensures stable VBR tolerance and long-term parameter stability under thermal and humidity stress |
| MSL Level 1 rating | Enables unlimited floor life and supports standard 260 °C Pb-free reflow without baking |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision and system immunity |
| RoHS-compliant HE3 suffix | Indicates industrial-grade, AEC-Q101 qualified, RoHS-compliant construction with matte tin plating |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges >80 V. Use Value: Withstands 1500 W surges and clamps to ≤126 V, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation systems. IC Role / Device Role / Timing Role: Parallel-connected TVS on signal lines to absorb ESD and switching noise from nearby solenoids. Use Value: Sub-µA leakage at 78 V VWM avoids loading high-impedance sensor outputs; fast response preserves signal fidelity. |
| Telecom DC Power Input Protection | Consumer Power Adapter Output Protection |
Use Scenario: Securing 48 V PoE-powered equipment inputs against induced lightning surges. IC Role / Device Role / Timing Role: Primary-level TVS on DC input rail upstream of DC/DC converters. Use Value: 1500 W PPPM rating meets IEC 61000-4-5 Level 4 requirements; DO-215AB footprint supports high-current PCB routing. | Use Scenario: Adding secondary-side surge protection on USB-C PD adapter 20 V output rails. IC Role / Device Role / Timing Role: Unidirectional clamping device between VBUS and GND to suppress coupling transients. Use Value: 78 V VWM provides safe margin above 20 V nominal, while 126 V VC limits downstream MOSFET stress during surge events. |
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 | Same VWM (78 V), lower PPPM (400 W), SMA (DO-214AC) package, RθJA = 110 °C/W | Lower surge capacity; suitable only for non-automotive, lower-energy transients | Select when cost or board space is critical and surge threat level is ≤400 W |
| SMCJ78AHE3/9AT | Same VWM (78 V), higher PPPM (3000 W), larger SMC (DO-214AB) package, RθJA = 50 °C/W | Higher thermal mass and surge rating; requires more PCB area but handles repeated surges better | Select when protecting against repetitive load dump or high-energy lightning-induced surges |
Compared with SMAJ78A-E3/57T, SMCG78AHE3/9AT delivers nearly 4× higher surge power and superior thermal performance in a compact DO-215AB outline; versus SMCJ78AHE3/9AT, it trades 50% less surge capacity for smaller footprint and tighter layout integration in space-constrained automotive modules.
Availability
SMCG78AHE3/9AT is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply across production lifecycles.
Supply support for SMCG78AHE3/9AT 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, TVS devices, and optoelectronics with emphasis on reliability and automotive qualification.
The SMCG series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, AEC-Q101-compliant transient suppression in harsh automotive and industrial environments.
FAQ
What is the breakdown voltage range of the SMCG78AHE3/9AT?
The SMCG78AHE3/9AT 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 tight VBR window ensures predictable clamping onset above its 78 V stand-off voltage and provides sufficient margin against false triggering during normal operation.
Is SMCG78AHE3/9AT suitable for automotive applications?
Yes, SMCG78AHE3/9AT is AEC-Q101 qualified and manufactured with HE3 suffix indicating RoHS compliance and automotive-grade reliability. It meets MSL Level 1, supports 260 °C lead-free reflow, and is validated for temperature cycling, HTRB, and ESD - making it appropriate for engine control units, body electronics, and ADAS sensor interfaces.
What does the "HE3" suffix mean in SMCG78AHE3/9AT?
The "HE3" suffix in SMCG78AHE3/9AT denotes RoHS-compliant, AEC-Q101 qualified construction with matte tin-plated leads. It distinguishes this variant from industrial-grade E3 (RoHS, non-AEC-Q101) and HM3 (halogen-free + AEC-Q101) versions, confirming suitability for automotive production and high-reliability industrial use.
How is the SMCG78AHE3/9AT mounted and what PCB layout is recommended?
SMCG78AHE3/9AT uses gull-wing leads in the DO-215AB (SMCG) package and is mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in the Vishay datasheet. This pad layout ensures optimal thermal dissipation (RθJA = 75 °C/W) and mechanical reliability during thermal cycling and vibration.
What is the maximum clamping voltage of SMCG78AHE3/9AT under surge conditions?
The SMCG78AHE3/9AT clamps to a maximum of 126 V at its rated peak pulse current (IPPM), defined by the 10/1000 µs waveform. This VC value is measured under standardized test conditions and represents the upper voltage limit imposed on protected circuitry during a full 1500 W transient event.
SMCG78AHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AB, SMC Gull Wing
- 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 (SMCG)
SMCG78AHE3/9AT FAQ
1.How can I place an order for SMCG78AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG78AHE3/9AT 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 SMCG78AHE3/9AT reliable?
The price and inventory of SMCG78AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG78AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG78AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG78AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG78AHE3/9AT?
SMCG78AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG78AHE3/9AT 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 SMCG78AHE3/9AT?
For technical support, including SMCG78AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG78AHE3/9AT requirements.
6.How does Aetrix verify that SMCG78AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG78AHE3/9AT 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 SMCG78AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG78AHE3/9AT?
All SMCG78AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG78AHE3/9AT, 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 SMCG78AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCG78AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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