My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCG78A-M3/57T
- Part No.:
- SMCG78A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG78A-M3/57T.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,291
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCG78A-M3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in the SMCG (DO-215AB) package, with a 78 V stand-off voltage (VWM), 86.7–95.8 V breakdown voltage (VBR), 1500 W peak pulse power (PPPM), and 11.9 A peak pulse current (IPPM) at 10/1000 µs waveform - designed for robust overvoltage protection of automotive power rails and industrial DC inputs.
For engineers reviewing the SMCG78A-M3/57T datasheet, SMCG78A-M3/57T pinout, SMCG78A-M3/57T application, or SMCG78A-M3/57T equivalent, key selection criteria include clamping voltage (VC = 126 V), AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), and thermal resistance (RθJA = 75 °C/W) under standard PCB pad layout.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging a glass-passivated silicon junction to deliver sub-nanosecond response to transients. Its 126 V clamping voltage at 11.9 A IPPM ensures reliable protection of downstream 78 V-rated systems without excessive voltage overshoot during surge events.
The device is rated for -55 °C to +150 °C junction temperature, meets MSL level 1 per J-STD-020, and features matte tin-plated leads solderable per J-STD-002 and JESD 22-B102 - enabling high-reliability automated assembly in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 86.7 V / 95.8 V at 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | 126 V at 11.9 A - clamped voltage during 10/1000 µs surge, limiting stress on protected ICs |
| PPPM | 1500 W - peak transient energy handling capability under standardized waveform |
| RθJA | 75 °C/W - thermal resistance from junction to ambient on 8 mm × 8 mm copper pads |
| TJ max | +150 °C - maximum allowable junction temperature for sustained operation |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: SMCG (DO-215AB) - low-profile, surface-mount gull-wing package with cathode band marking; dimensions 7.87 mm × 3.17 mm × 2.41 mm (L × W × H); UL 94 V-0 molding compound; matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to system ground in unidirectional TVS configuration | Provides low-impedance path to ground during transient clamp; polarity-sensitive placement required |
| Cathode | Current exit terminal in forward bias; marked with band; connected to protected line | Accepts surge current from protected node and routes it to ground via anode; band identifies orientation on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over time and temperature, minimizing parameter drift in harsh environments |
| AEC-Q101 qualification | Validates suitability for automotive powertrain and body electronics where reliability is mission-critical |
| Halogen-free & RoHS compliant (M3) | Meets environmental compliance requirements for industrial and automotive supply chains without compromising performance |
| Low incremental surge resistance | Enables tighter clamping (VC = 126 V) and faster energy dissipation during high-current transients |
| MSL Level 1 rating | Allows unlimited floor life and reflow up to 260 °C peak, simplifying SMT manufacturing flow |
Applications
| Automotive Power Rail Protection | Industrial DC Input Protection |
|---|---|
Use Scenario: Protecting 24 V/48 V battery-fed ECUs against load dump and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 78 V. Use Value: Limits voltage excursion to ≤126 V during 1500 W transients, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Safeguarding programmable logic controllers (PLCs) and motor drives against inductive kickback from solenoids and contactors. IC Role / Device Role / Timing Role: Standoff protector on 48 V auxiliary input, absorbing repetitive 10/1000 µs surges without degradation. Use Value: Maintains 78 V system integrity while surviving >1000 surges at 11.9 A due to low RθJA and robust junction construction. |
| Telecom DC Feeder Protection | Sensor Signal Line Protection |
Use Scenario: Shielding remote radio unit (RRU) power feeds in 5G base stations from lightning-induced surges on outdoor cables. IC Role / Device Role / Timing Role: Primary clamping device on -48 V DC feed line, coordinated with upstream MOVs. Use Value: Delivers 1500 W surge capacity with 126 V clamping, reducing risk of cascading failure in telecom infrastructure. | Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in automotive ADAS modules from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS on signal lines referenced to local ground. Use Value: Clamps transients within nanoseconds while adding <1 pF parasitic capacitance, preserving signal fidelity up to 100 MHz. |
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) and VC (126 V), but lower PPPM (400 W) and smaller SMA (DO-214AC) package | Lower surge rating suits consumer-grade or non-automotive applications; not AEC-Q101 qualified | Select when cost or board space is critical and surge energy remains below 400 W |
| SMCJ78A-M3/57T | Same VWM (78 V), higher PPPM (1500 W), identical DO-214AB package but larger footprint than SMCG | Higher thermal mass supports longer surge duration; requires larger PCB pad area (10.16 mm × 7.87 mm) | Select when extended surge duration or higher IFSM (200 A) is required beyond SMCG78A-M3/57T's capabilities |
Compared with SMAJ78A-E3/57T and SMCJ78A-M3/57T, SMCG78A-M3/57T delivers AEC-Q101 qualification and compact DO-215AB packaging in a 1500 W class - making it optimal for space-constrained automotive modules needing full automotive reliability without sacrificing surge margin.
Availability
SMCG78A-M3/57T is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, telecom DC feeder systems, and sensor interface circuits requiring stable component supply across multi-year production cycles.
Supply support for SMCG78A-M3/57T 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 SMCG series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and telecom systems where AEC-Q101 compliance and compact surface-mount form factor are essential.
FAQ
What is the clamping voltage of SMCG78A-M3/57T and how is it measured?
The clamping voltage (VC) of SMCG78A-M3/57T is 126 V, measured at 11.9 A peak pulse current (IPPM) using a standardized 10/1000 µs double-exponential waveform. This value reflects the maximum voltage seen across the device during surge conduction and is critical for ensuring protected circuitry remains below its absolute maximum ratings. The test condition is defined in the Vishay datasheet document 88457 and verified under JEDEC-standard mounting conditions.
Is SMCG78A-M3/57T suitable for automotive applications?
Yes, SMCG78A-M3/57T is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junctions, halogen-free RoHS-compliant materials (M3 suffix), and validation across temperature cycling, high-temperature reverse bias, and humidity testing. It is commonly deployed in engine control modules, body control units, and ADAS power domains where transient immunity and long-term reliability are mandatory.
What does the "M3" suffix mean in SMCG78A-M3/57T?
The "M3" suffix in SMCG78A-M3/57T indicates halogen-free, RoHS-compliant construction with industrial-grade reliability and JESD 201 Class 2 whisker resistance. Unlike "E3", which denotes standard RoHS compliance, "M3" adds halogen-free epoxy molding compound - meeting stricter environmental requirements for automotive and industrial OEMs without degrading electrical or thermal performance.
How does SMCG78A-M3/57T differ from bidirectional variants like SMCG78CA?
SMCG78A-M3/57T is unidirectional, with polarity-marked cathode band and forward conduction capability, whereas SMCG78CA is bidirectional and symmetric - lacking polarity marking and conducting in both directions. The unidirectional version offers lower leakage (<1 µA at 78 V), better clamping consistency in DC-biased applications, and compatibility with grounded-rail protection topologies where reverse conduction is undesirable.
What PCB pad layout is recommended for optimal thermal performance of SMCG78A-M3/57T?
Vishay specifies a minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad per terminal for SMCG78A-M3/57T to achieve the published RθJA of 75 °C/W. Thermal vias under pads and internal copper planes further reduce junction temperature rise during repeated surges. Deviating from this layout increases thermal resistance and may derate peak pulse power handling below 1500 W.
SMCG78A-M3/57T 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-M3/57T FAQ
1.How can I place an order for SMCG78A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG78A-M3/57T 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-M3/57T reliable?
The price and inventory of SMCG78A-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG78A-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCG78A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG78A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG78A-M3/57T?
SMCG78A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG78A-M3/57T 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-M3/57T?
For technical support, including SMCG78A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG78A-M3/57T requirements.
6.How does Aetrix verify that SMCG78A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG78A-M3/57T 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-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCG78A-M3/57T?
All SMCG78A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG78A-M3/57T, 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-M3/57T part is unused and in its original packaging.
Return procedure for SMCG78A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG78A-M3/57T Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
