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Vishay General Semiconductor - Diodes Division SMCG78CAHE3/9AT
- Part No.:
- SMCG78CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG78CAHE3/9AT.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,843
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Product details
Overview
SMCG78CAHE3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) in the SMCG (DO-215AB) package, designed for robust overvoltage protection of sensitive electronics. 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 dissipation (PPPM) with a 10/1000 µs waveform.
For engineers reviewing the SMCG78CAHE3/9AT datasheet, SMCG78CAHE3/9AT pinout, SMCG78CAHE3/9AT application, or SMCG78CAHE3/9AT equivalent, this AEC-Q101 qualified, RoHS-compliant TVS diode supports automotive-grade ESD and surge protection in signal lines, power rails, and sensor interfaces where fast response (<1 ns), low clamping ratio, and stable bidirectional operation are critical.
Technical Context
The SMCG78CAHE3/9AT operates as a bidirectional avalanche diode with symmetrical breakdown characteristics-minimum VBR = 86.7 V and maximum VBR = 95.8 V at 1 mA test current. Its glass-passivated junction ensures stable leakage performance (ID ≤ 1.0 µA at VWM) and long-term reliability under repetitive surge stress.
Thermally, it delivers RθJA = 75 °C/W and RθJL = 15 °C/W, enabling effective heat dissipation on standard 8.0 mm × 8.0 mm copper pads. With a 150 °C maximum junction temperature and MSL Level 1 rating (260 °C peak reflow), it supports high-volume automated SMT assembly in 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 - Ensures predictable, symmetrical breakdown in both directions |
| VC @ IPPM | 126 V at 11.9 A - Limits downstream voltage to safe levels during 10/1000 µs transients |
| PPPM | 1500 W - Handles high-energy surges per IEC 61000-4-5 Level 4 without failure |
| ID @ VWM | ≤1.0 µA - Minimizes standby power loss and avoids false triggering in low-power circuits |
| TJ max. | +150 °C - Supports operation in under-hood automotive and industrial ambient conditions |
| Package | SMCG (DO-215AB) - Low-profile surface-mount package compatible with J-STD-020 reflow profiles |
Pinout & Package
SMCG78CAHE3/9AT uses the DO-215AB (SMCG) package: a 2-terminal, bidirectional device with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; symmetric conduction path |
| Terminal 2 | Anode/Cathode (bidirectional) | Paired terminal completing the bidirectional clamping path; no functional distinction between terminals |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ≈ 1.34) and superior energy handling vs. comparable TVS devices |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at 260 °C peak without moisture-related damage |
| Glass passivated junction | Provides stable leakage, high surge endurance (>1000 pulses), and resistance to humidity-induced degradation |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed automotive and industrial enclosures |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transients before reaching IC pins. Use Value: Maintains signal integrity by limiting clamped voltage to 126 V while surviving repeated 1500 W surges-critical for AEC-Q100 Grade 1–2 ICs. | Use Scenario: Safeguarding differential CAN H/L lines against ESD (IEC 61000-4-2 ±15 kV) and fast transient bursts in factory automation controllers. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) providing symmetrical protection without disrupting 1 Mbps CAN signaling integrity. Use Value: Sub-1 ns response time and <1.0 µA leakage preserve bus biasing and minimize bit error rate under sustained 78 V common-mode noise. |
| Telecom Power Rail Clamping | Consumer Device USB Port Protection |
Use Scenario: Guarding 48 V DC power inputs in PoE-powered telecom switches and base station RF modules against lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end TVS on DC input rail, coordinated with upstream fuse and downstream DC-DC converter. Use Value: 1500 W PPPM rating enables compliance with IEC 61000-4-5 (10/700 µs) Level 4 without derating-reducing need for cascaded protection stages. | Use Scenario: Shielding USB 2.0 data lines and VBUS in smart home hubs and portable audio devices from human-body-model ESD events. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) bidirectional clamp placed adjacent to USB connector to prevent latch-up in PHY ICs. Use Value: 78 V VWM allows safe operation across full USB 2.0 VBUS range (4.75–5.25 V) while clamping ESD spikes to <126 V-preventing gate oxide damage in USB transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ78CA-E3/57T | Same VWM (78 V) and VC (126 V), but lower PPPM (400 W); SMA (DO-214AC) package, larger footprint | Lower surge capacity limits use to consumer-grade or non-automotive applications with milder threat profiles | Select when cost sensitivity outweighs automotive qualification or high-energy surge requirements |
| 1.5KE78CA | Higher VWM (78 V), same bidirectional function, but through-hole DO-201 package; 1500 W PPPM, but slower thermal response and no AEC-Q101 rating | Not suitable for automated SMT production or under-hood automotive environments due to leaded construction and qualification gap | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMAJ78CA-E3/57T and 1.5KE78CA, the SMCG78CAHE3/9AT uniquely combines AEC-Q101 qualification, DO-215AB low-profile SMT packaging, and full 1500 W surge capability-making it the only option qualified for volume automotive electronics requiring zero PCB rework and guaranteed surge endurance.
Availability
SMCG78CAHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, telecom power supplies, and consumer USB protection requiring stable component supply, AEC-Q101 compliance, and consistent 1500 W surge performance.
Supply support for SMCG78CAHE3/9AT 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, automotive qualification, and high-volume manufacturability.
The SMCG series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-reliability bidirectional surge suppression in automotive, industrial, and telecom systems where compact size, AEC-Q101 validation, and precise clamping performance are mandatory.
FAQ
What is the clamping voltage of SMCG78CAHE3/9AT at its rated peak pulse current?
The SMCG78CAHE3/9AT has a maximum clamping voltage (VC) of 126 V at its specified peak pulse current (IPPM) of 11.9 A using the 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and reflects the actual voltage seen by protected circuitry during worst-case surge events. The SMCG78CAHE3/9AT maintains this clamping performance consistently across its operating temperature range.
Is SMCG78CAHE3/9AT suitable for automotive applications?
Yes, SMCG78CAHE3/9AT is AEC-Q101 qualified and manufactured with HE3 suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It meets MSL Level 1 reflow requirements and operates reliably from –55 °C to +150 °C. The SMCG78CAHE3/9AT is explicitly intended for use in automotive subsystems such as body control modules, ADAS sensor interfaces, and infotainment power conditioning where certified surge immunity is required.
What does the "CA" suffix indicate in SMCG78CAHE3/9AT?
The "CA" suffix in SMCG78CAHE3/9AT denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression in both polarities-no cathode/anode distinction. Electrical characteristics including VBR, VC, and IPPM apply identically in either direction. This differs from unidirectional variants (e.g., SMCG78A), which require correct polarity orientation during placement. The SMCG78CAHE3/9AT eliminates orientation concerns in layout and simplifies assembly.
How does the SMCG78CAHE3/9AT package compare to SMAJ or SMC packages?
The SMCG78CAHE3/9AT uses the DO-215AB (SMCG) package-smaller than SMC (DO-214AB) and slightly more compact than SMA (DO-214AC). Its 0.245" × 0.125" footprint and 0.058" height enable higher board density. Unlike SMAJ, SMCG offers AEC-Q101 qualification and tighter thermal resistance (RθJL = 15 °C/W). The SMCG78CAHE3/9AT also features matte tin leads compliant with J-STD-002, supporting fine-pitch automated placement.
What is the maximum reverse leakage current for SMCG78CAHE3/9AT at its stand-off voltage?
The SMCG78CAHE3/9AT exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 78 V stand-off voltage (VWM), measured at TA = 25 °C. This low leakage ensures minimal impact on battery-powered or high-impedance sensing circuits. Leakage remains within specification across the full operating temperature range, supporting reliable long-term performance in always-on automotive and industrial monitoring systems where the SMCG78CAHE3/9AT is deployed.
SMCG78CAHE3/9AT 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:
- -
- 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 (SMCG)
SMCG78CAHE3/9AT FAQ
1.How can I place an order for SMCG78CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG78CAHE3/9AT 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 SMCG78CAHE3/9AT reliable?
The price and inventory of SMCG78CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG78CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG78CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG78CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG78CAHE3/9AT?
SMCG78CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG78CAHE3/9AT 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 SMCG78CAHE3/9AT?
For technical support, including SMCG78CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG78CAHE3/9AT requirements.
6.How does Aetrix verify that SMCG78CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG78CAHE3/9AT 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 SMCG78CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG78CAHE3/9AT?
All SMCG78CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG78CAHE3/9AT, 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 SMCG78CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCG78CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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