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Vishay General Semiconductor - Diodes Division SMPC78AN-M3/I
- Part No.:
- SMPC78AN-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
SMPC78AN-M3/I.pdf
- Description:
- TVS DIODE 78VWM 126VC TO277A
- Quantity:
- Payment:
- Shipping:
Inventory:9,457
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Product details
Overview
SMPC78AN-M3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in the SMPC (TO-277A) package, designed for clamping transient overvoltages on power and signal lines. It features a 78.0 V stand-off voltage (VWM), 86.7–95.8 V breakdown voltage (VBR), 126 V maximum clamping voltage (VC) at 11.9 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - ideal for protecting automotive sensor interfaces and industrial power rails.
For engineers reviewing the SMPC78AN-M3/I datasheet, SMPC78AN-M3/I pinout, SMPC78AN-M3/I application, or SMPC78AN-M3/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status (confirmed for SMPC78AN series), thermal resistance (RθJA ≤ 100 °C/W), MSL Level 1 rating, and halogen-free RoHS-compliant construction.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, optimized for fast response to ESD and inductive switching transients. Its low incremental surge resistance and 1.1 mm profile support high-density PCB layouts in space-constrained automotive and industrial modules.
The SMPC78AN-M3/I uses the eSMP® Series SMPC (TO-277A) package with dual anode/dual cathode configuration: Anode 1 & 2 share one terminal, Cathode is isolated - enabling robust heat dissipation when mounted with cathode on heatsink per datasheet thermal test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78.0 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 86.7 V / 95.8 V at 1.0 mA - ensures reliable breakdown onset within tight tolerance band |
| VC @ IPPM | 126 V at 11.9 A - defines worst-case clamped voltage during 10/1000 μs surge, limiting stress on downstream ICs |
| PPPM | 1500 W - peak transient energy handling capacity under standardized 10/1000 μs waveform |
| TJ max | +150 °C - enables operation in under-hood automotive environments and industrial enclosures |
| Package | SMPC (TO-277A) - JEDEC-compliant 3-terminal surface-mount package with 1.1 mm height and MSL Level 1 rating |
| Polarity | Unidirectional - cathode-band marked; blocks reverse current until breakdown threshold is exceeded |
Pinout & Package
SMPC78AN-M3/I uses the SMPC (TO-277A) package: a 3-terminal surface-mount case with dual-anode/dual-cathode internal structure. The cathode band denotes the cathode terminal; Anode 1 and Anode 2 are internally connected and share the same terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 & Anode 2 (common) | Input/Source node | Internally shorted terminals accepting transient surge current into the device; connects to protected line (e.g., 12 V rail or CAN-H) |
| Cathode | Clamp output/return path | Connected to ground or low-impedance return; carries full surge current during clamping; optimal thermal performance when mounted on heatsink |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile (1.1 mm height) | Enables placement beneath low-clearance shields or in stacked board assemblies without mechanical interference |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22 standards |
| Halogen-free & RoHS-compliant (M3 suffix) | Meets global environmental compliance requirements for industrial and automotive production programs |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving protection margin for sensitive gate drivers |
Applications
| Automotive Sensor Protection | Industrial Power Rail Clamping |
|---|---|
Use Scenario: Protecting LIN bus transceivers 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: Unidirectional TVS placed between sensor signal line and chassis ground to clamp transients before they reach precision amplifier inputs. Use Value: 126 V clamping voltage ensures MCU I/O pins remain below absolute maximum ratings during 100 V/50 ms load-dump events. |
Use Scenario: Safeguarding 24 V DC industrial PLC input modules against inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Primary overvoltage clamp on power entry point, coordinated with upstream fuse and downstream LDO. Use Value: 1500 W PPPM rating handles repetitive 10/1000 μs surges up to 11.9 A without degradation, supporting >100,000 cycle life. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Shielding Ethernet PHY magnetics and PoE controller ICs from lightning-induced surges on RJ45 ports. IC Role / Device Role / Timing Role: Secondary-level TVS on secondary-side DC bias lines (e.g., MDI pair return paths) after primary gas discharge tube. Use Value: Fast response time and low capacitance (<100 pF typical) prevent signal integrity loss on 100BASE-TX data lanes. |
Use Scenario: Input-stage transient suppression in USB-C PD adapters and AC/DC wall adapters exposed to mains-borne surges. IC Role / Device Role / Timing Role: Final-stage clamping device after X/Y capacitors and common-mode choke, shunting residual differential-mode spikes. Use Value: 78.0 V VWM aligns with 24 V nominal adapter outputs, allowing safe operation while clamping 126 V peaks from 1 kV/500 A surge tests. |
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-E3/5A (Vishay) | DO-214AC package; 78 V VWM; 1500 W PPPM; unidirectional; higher RθJA (~140 °C/W) | Larger footprint; less suitable for ultra-thin automotive modules; lower thermal efficiency on FR4 | Select when legacy SMA layout exists and height constraint <1.1 mm is not critical |
| TPSMD78A (Texas Instruments) | DO-214AB package; 78 V VWM; 1500 W PPPM; unidirectional; AEC-Q101 qualified; RθJA ~120 °C/W | Same power rating but 2.2 mm height; incompatible with space-constrained SMPC footprints | Choose only if existing design uses SMB/SMA pads and requires TI supply chain alignment |
Compared with SMAJ78A-E3/5A and TPSMD78A, SMPC78AN-M3/I delivers superior thermal performance (RθJM ≤ 3 °C/W) and 45 % lower profile - making it the preferred choice for next-generation automotive ADAS domain controllers and compact industrial IoT gateways where board thickness and junction temperature rise are critical.
Availability
SMPC78AN-M3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial power rail clamping, telecom line protection, and consumer power adapter input stages requiring stable component supply across multi-year production cycles.
Supply support for SMPC78AN-M3/I 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 automotive, industrial, and computing applications.
The SMPC series belongs to Vishay's Transient Voltage Suppressor family, engineered specifically for high-power, low-profile, AEC-Q101-compliant surge protection in harsh environment electronics.
FAQ
What is the polarity configuration of SMPC78AN-M3/I?
The SMPC78AN-M3/I is a unidirectional TVS diode with cathode-band marking. Internally, it has two anode terminals (Anode 1 and Anode 2) connected together, and one isolated cathode terminal. This configuration allows it to conduct only during positive transients relative to ground, making it suitable for DC power line protection where reverse voltage blocking is required. The cathode band must be oriented toward the system ground reference.
Is SMPC78AN-M3/I AEC-Q101 qualified?
Yes, SMPC78AN-M3/I is AEC-Q101 qualified. The "AN" suffix in the part number explicitly denotes AEC-Q101 qualification per the Vishay datasheet (Document Number: 89116, Revision: 17-Sep-2021), covering the full SMPC22AN through SMPC85AN series. This qualification includes stress testing for temperature cycling, high-temperature reverse bias, and ESD robustness required for automotive under-hood and cabin applications.
What is the maximum clamping voltage for SMPC78AN-M3/I at rated surge current?
The maximum clamping voltage (VC) for SMPC78AN-M3/I is 126 V, measured at 11.9 A peak pulse current (IPPM) using the standard 10/1000 μs waveform. This value is guaranteed across the operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components like microcontrollers or transceivers remain within their absolute maximum ratings.
Does SMPC78AN-M3/I require special PCB layout considerations?
Yes. For optimal thermal performance, Vishay recommends mounting the SMPC78AN-M3/I with the cathode terminal on a heatsink or large copper pour, as specified in the thermal characterization (RθJM ≤ 3 °C/W). The SMPC (TO-277A) footprint must follow the exact pad dimensions in the datasheet (e.g., 0.268" × 0.186" mounting area), and the cathode band orientation must be verified during stencil design and placement to ensure correct polarity alignment in automated assembly.
What does the "M3/I" suffix indicate in SMPC78AN-M3/I?
The "M3" suffix indicates halogen-free, RoHS-compliant, industrial-grade construction with matte tin-plated leads meeting J-STD-002 and JESD 22-B102 solderability standards. The "I" denotes packaging in 13-inch diameter plastic tape and reel, with a base quantity of 6500 units - optimized for high-volume SMT production lines. This differs from "H"-suffixed variants, which use 7-inch reels with 1500-unit quantities.
SMPC78AN-M3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- TO-277, 3-PowerDFN
- 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:
- TO-277A (SMPC)
SMPC78AN-M3/I FAQ
1.How can I place an order for SMPC78AN-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMPC78AN-M3/I 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 SMPC78AN-M3/I reliable?
The price and inventory of SMPC78AN-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMPC78AN-M3/I is usually 5 days.
3.What payment methods are accepted for SMPC78AN-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMPC78AN-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMPC78AN-M3/I?
SMPC78AN-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMPC78AN-M3/I 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 SMPC78AN-M3/I?
For technical support, including SMPC78AN-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMPC78AN-M3/I requirements.
6.How does Aetrix verify that SMPC78AN-M3/I is sourced from the original manufacturer or authorized distributors?
All SMPC78AN-M3/I 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 SMPC78AN-M3/I meets industry standards.
7.What is the process for return or replacement of SMPC78AN-M3/I?
All SMPC78AN-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMPC78AN-M3/I, 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 SMPC78AN-M3/I part is unused and in its original packaging.
Return procedure for SMPC78AN-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMPC78AN-M3/I Tags
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