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Vishay General Semiconductor - Diodes Division SMCG78A-E3/9AT
- Part No.:
- SMCG78A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG78A-E3/9AT.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,674
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Product details
Overview
SMCG78A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMCG (DO-215AB) package, with a standoff voltage of 78 V, breakdown voltage range 86.7–95.8 V at 1 mA, peak pulse power rating of 1500 W (10/1000 µs), clamping voltage of 126 V at 11.9 A, and AEC-Q101 qualification for automotive-grade reliability. It protects MOSFETs and ICs against inductive switching transients in engine control units.
For engineers reviewing the SMCG78A-E3/9AT datasheet, SMCG78A-E3/9AT pinout, SMCG78A-E3/9AT application, or SMCG78A-E3/9AT equivalent, key selection criteria include unidirectional polarity, DO-215AB thermal performance (RθJA = 75 °C/W), 1500 W surge capability, 126 V clamping at rated current, and RoHS-compliant matte tin-plated leads suitable for J-STD-002 soldering.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuitry, conducting only when reverse voltage exceeds its breakdown threshold (VBR = 86.7–95.8 V). Its glass-passivated junction ensures stable leakage (<1.0 µA at 78 V) and fast response time to sub-nanosecond transients.
The SMCG78A-E3/9AT uses a low-profile DO-215AB package with cathode band marking, supports 200 A non-repetitive forward surge (8.3 ms half-sine), and maintains operation across –55 °C to +150 °C junction temperature range while meeting MSL Level 1 reflow requirements (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Ensures reliable triggering above system operating voltage with margin |
| VC @ IPPM | 126 V at 11.9 A - Clamped voltage during 1500 W transient limits stress on downstream components |
| PPPM | 1500 W (10/1000 µs) - Withstands high-energy surges common in automotive load-dump and inductive kick events |
| IFSM | 200 A (8.3 ms half-sine) - Handles single-event surge currents without bond-wire fusing |
| TJ max. | +150 °C - Enables use in under-hood automotive environments with minimal derating |
| RθJA | 75 °C/W - Requires minimum 8.0 mm × 8.0 mm copper pad per terminal for full power rating |
Pinout & Package
Package: SMCG (DO-215AB), surface-mount, low-profile gull-wing leadform with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or low-side reference in unidirectional protection configuration |
| Cathode | Current exit point during reverse-biased clamping | Connected to protected line (e.g., 12 V rail); band-marked end identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| Glass passivated junction | Ensures long-term stability of VBR and low leakage (<1.0 µA) over temperature and lifetime |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning or dry-pack requirements |
| UL 94 V-0 molding compound | Meets flammability safety standards for enclosed automotive and industrial enclosures |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Power Stage |
|---|---|
Use Scenario: Protects microcontroller I/O and gate drivers from load-dump transients and relay coil flyback in 12 V/24 V vehicle systems. IC Role / Device Role: Unidirectional TVS placed between power rail and ground to clamp positive-going surges. Use Value: 126 V clamping voltage prevents damage to 100 V-rated MOSFETs and 5 V logic interfaces during ISO 7637-2 Pulse 5a events. | Use Scenario: Shields PWM gate driver outputs from inductive kickback generated by BLDC motor windings during commutation. IC Role / Device Role: Parallel-connected clamping diode across half-bridge high-side and low-side FET source-drain paths. Use Value: 1500 W peak pulse power handles repetitive 10/1000 µs surges up to 11.9 A without degradation, extending power stage MTBF. |
| Telecom Power Supply Input | Automotive Camera Module Interface |
Use Scenario: Guards AC/DC adapter input stage against lightning-induced surges on PoE or wall-adapter lines. IC Role / Device Role: Primary-level TVS on DC input rail upstream of bulk capacitor and controller IC. Use Value: 78 V standoff allows compatibility with 48 V telecom systems while maintaining margin above nominal input. | Use Scenario: Safeguards MIPI CSI-2 data lines and power rails in rear-view or surround-view cameras exposed to ESD and cable discharge. IC Role / Device Role: Discrete unidirectional suppressor on 12 V bias rail and bidirectional variants on differential signal pairs. Use Value: AEC-Q101 qualification and –55 °C to +150 °C operation ensure reliability in wide-temperature automotive camera housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient 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 = 100 °C/W | Limited to lower-energy transients; unsuitable for automotive load-dump per ISO 7637-2 | Select when board space is constrained and surge energy is ≤400 W |
| SMCJ78A-E3/9AT | Same VWM (78 V), higher PPPM (1500 W), SMC (DO-214AB) package, RθJA = 40 °C/W | Better thermal dissipation but larger footprint; requires larger PCB pads | Select when higher thermal margin is needed and DO-215AB size constraint is relaxed |
Compared with SMAJ78A-E3/57T and SMCJ78A-E3/9AT, the SMCG78A-E3/9AT delivers identical 1500 W surge capability in a smaller DO-215AB footprint than SMCJ, while offering superior thermal performance over SMAJ-enabling compact, high-reliability protection in space-constrained automotive modules.
Availability
SMCG78A-E3/9AT is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, telecom power supplies, and camera module interfaces requiring stable component supply with AEC-Q101 assurance and RoHS compliance.
Supply support for SMCG78A-E3/9AT 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, power handling, and automotive qualification.
The SMCG series targets high-energy transient suppression in harsh environments, specifically engineered for AEC-Q101 compliance, low-profile surface mounting, and robust clamping performance in automotive and industrial power systems.
FAQ
What is the clamping voltage of the SMCG78A-E3/9AT at its rated peak pulse current?
The SMCG78A-E3/9AT has a maximum clamping voltage (VC) of 126 V at its rated peak pulse current (IPPM) of 11.9 A, measured using a 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a transient event and is critical for ensuring compatibility with downstream 100 V-rated components. The SMCG78A-E3/9AT maintains this clamping performance across its specified operating temperature range.
Is the SMCG78A-E3/9AT suitable for automotive applications?
Yes, the SMCG78A-E3/9AT is AEC-Q101 qualified and explicitly designed for automotive use, including engine control units, body electronics, and ADAS camera modules. Its construction features glass-passivated junctions, MSL Level 1 reflow compatibility, and operation from –55 °C to +150 °C. The SMCG78A-E3/9AT meets stringent automotive surge immunity requirements such as ISO 7637-2 Pulse 5a when mounted per recommended pad layout.
What does the "E3/9AT" suffix indicate in SMCG78A-E3/9AT?
The "E3" suffix denotes RoHS-compliant, industrial-grade construction with matte tin-plated leads, while "9AT" specifies packaging in a 13-inch diameter plastic tape-and-reel format containing 3500 units. This differs from "57T" (7-inch reel, 850 units) and confirms the SMCG78A-E3/9AT is optimized for high-volume automated assembly. The SMCG78A-E3/9AT's E3 marking also certifies compliance with JESD201 Class 2 whisker resistance testing.
How does the SMCG78A-E3/9AT compare to bidirectional TVS diodes like SMCG78CA?
The SMCG78A-E3/9AT is unidirectional and intended for DC rail protection where polarity is fixed, whereas SMCG78CA is bidirectional and suited for AC or differential signal lines. The SMCG78A-E3/9AT exhibits forward voltage drop (~3.5 V at 100 A) and cathode band marking, while SMCG78CA has symmetrical breakdown in both directions and no polarity marking. For 12 V automotive power rails, the SMCG78A-E3/9AT provides tighter clamping and lower leakage than its bidirectional counterpart.
What thermal design considerations apply to the SMCG78A-E3/9AT?
The SMCG78A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To sustain full 1500 W pulse power, designers must implement these minimum pad dimensions and avoid thermal isolation. Derating is required above 25 °C ambient, per Figure 2 in the Vishay datasheet 88457. The SMCG78A-E3/9AT's RθJL of 15 °C/W further supports heat transfer to PCB copper planes.
SMCG78A-E3/9AT 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCG)
SMCG78A-E3/9AT FAQ
1.How can I place an order for SMCG78A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG78A-E3/9AT 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 SMCG78A-E3/9AT reliable?
The price and inventory of SMCG78A-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG78A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG78A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG78A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG78A-E3/9AT?
SMCG78A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG78A-E3/9AT 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 SMCG78A-E3/9AT?
For technical support, including SMCG78A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG78A-E3/9AT requirements.
6.How does Aetrix verify that SMCG78A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG78A-E3/9AT 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 SMCG78A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG78A-E3/9AT?
All SMCG78A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG78A-E3/9AT, 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 SMCG78A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCG78A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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