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Vishay General Semiconductor - Diodes Division SMPC78AN-M3/H
- Part No.:
- SMPC78AN-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
SMPC78AN-M3/H.pdf
- Description:
- TVS DIODE 78VWM 126VC TO277A
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
SMPC78AN-M3/H from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor in the SMPC (TO-277A) package, featuring 78.0 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). It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial power electronics.
For engineers reviewing the SMPC78AN-M3/H datasheet, SMPC78AN-M3/H pinout, SMPC78AN-M3/H application, or SMPC78AN-M3/H equivalent, this page delivers verified electrical specs, thermal derating behavior, AEC-Q101 qualification status, JEDEC TO-277A mechanical dimensions, and real-world clamping performance at IPPM - all critical for ESD/surge protection design validation and BOM selection.
Technical Context
This device operates as a unidirectional avalanche diode with cathode-band polarity marking, optimized for fast response (<1 ns) to 10/1000 μs surge waveforms. Its low incremental surge resistance and 126 V maximum clamping voltage (VC) at IPPM ensure robust overvoltage limiting during repetitive or single-event transients.
Thermally, it is rated for TJ = –55 °C to +150 °C, with RθJA = 100 °C/W (max) on FR4 PCB (2 oz copper, standard footprint) and RθJM = 3 °C/W (max) when mounted to heatsink. The M3 suffix confirms halogen-free, RoHS-compliant, industrial-grade construction; the /H tape-and-reel packaging supports automated SMT placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78.0 V - Maximum reverse stand-off voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR min/max | 86.7 V / 95.8 V at IT = 1.0 mA - Confirmed avalanche onset range; ensures predictable turn-on across production lot |
| VC @ IPPM | 126 V - Clamped voltage at 11.9 A peak pulse; determines maximum stress imposed on protected downstream circuitry |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 μs waveform; validates capability against IEC 61000-4-5 Level 4 surges |
| IR @ VWM | 1.0 μA - Reverse leakage at rated stand-off; negligible bias current impact on high-impedance sensor or control lines |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures |
Pinout & Package
Package: SMPC (TO-277A), surface-mount, 3-terminal configuration with cathode band marking. Dimensions: 4.80 × 3.70 × 1.10 mm (L × W × H), compliant with JEDEC TO-277A outline and UL 94 V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 & Anode 2 | Common anode connection | Internally tied terminals; must be connected to same potential - typically system ground or low-side return path |
| Cathode | Transient energy sink | Connected to protected line (e.g., 24 V rail or sensor input); conducts surge current to anode during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile (1.1 mm height) | Enables use in space-constrained modules such as automotive ECUs and portable industrial sensors without compromising board clearance |
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces per stress test requirements |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow without moisture-induced failure; eliminates pre-bake requirement in standard SMT lines |
| Matte tin-plated leads | Ensures reliable solderability per J-STD-002 and JESD 22-B102; compatible with no-clean and water-soluble flux chemistries |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails in engine control units against load-dump and inductive kickback transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rail and chassis ground to clamp surges above 78 V while remaining non-conductive during normal operation. Use Value: Limits rail voltage to ≤126 V during 1500 W transients, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input cards. IC Role / Device Role / Timing Role: TVS shunt element on sensor output line, referenced to system ground, absorbing ESD and field-induced spikes. Use Value: Maintains signal integrity by suppressing transients before they reach precision ADC front-end, with <1.0 μA leakage at 78 V. |
| Telecom DC Power Feeding Protection | Motor Drive Gate Driver Protection |
Use Scenario: Securing -48 V DC feeding lines in remote radio head (RRH) base stations against lightning-induced surges. IC Role / Device Role / Timing Role: Cathode-to-line configuration on negative rail, conducting surge current to common ground plane during positive-going transients. Use Value: Withstands 1500 W pulses while clamping to 126 V, preserving isolation integrity of DC/DC converters downstream. | Use Scenario: Shielding high-side gate drivers in BLDC inverters from Miller-induced voltage spikes during IGBT/MOSFET switching. IC Role / Device Role / Timing Role: Fast-response TVS placed between gate and source, limiting dv/dt-induced overshoot on gate oxide. Use Value: Sub-ns response and 126 V clamping prevent gate oxide breakdown in 600 V+ power stages operating at >20 kHz PWM. |
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; lower PPPM (400 W); VWM = 78.0 V; VC = 121 V at 11.5 A | Lower power handling limits use to sub-1 kV/microsecond transients; not AEC-Q101 qualified | Select when cost-sensitive consumer designs require basic surge immunity without automotive qualification or high-energy clamping. |
| 1.5KE78A (ON Semiconductor) | DO-201AD axial package; higher profile (5.2 mm); PPPM = 1500 W; VWM = 69.2 V; VC = 121 V at 12.4 A | Through-hole mounting only; lower VWM reduces noise margin; unsuitable for automated SMT assembly | Choose for legacy through-hole boards or prototyping where board space is unconstrained and reflow compatibility is not required. |
Compared with SMAJ78A-E3/5A and 1.5KE78A, SMPC78AN-M3/H uniquely combines AEC-Q101 qualification, ultra-low 1.1 mm profile, and full 1500 W surge rating in a JEDEC TO-277A SMT package - enabling compact, automotive-grade protection without layout or process compromise.
Availability
SMPC78AN-M3/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom DC feeding circuits, and motor drive gate driver safeguarding requiring stable component supply and traceable sourcing.
Supply support for SMPC78AN-M3/H 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, power efficiency, and automotive-grade qualification.
The SMPC series is part of Vishay's TransZORB® TVS platform designed specifically for high-energy, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where compact size, AEC-Q101 compliance, and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMPC78AN-M3/H at its rated peak pulse current?
The SMPC78AN-M3/H has a maximum clamping voltage (VC) of 126 V at its rated peak pulse current (IPPM) of 11.9 A, measured under 10/1000 μs waveform conditions. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in the Vishay datasheet Document Number 89116, page 2. Designers must verify that downstream components tolerate this clamping level under worst-case transient conditions. SMPC78AN-M3/H maintains this performance across its full operating temperature range.
Is SMPC78AN-M3/H qualified for automotive applications?
Yes, SMPC78AN-M3/H is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet (Document Number 89116, page 1) under "FEATURES" and confirmed in the Ordering Information table (page 3). The "AN" suffix denotes AEC-Q101 qualification, and the "HM3" variant is the fully qualified version; however, SMPC78AN-M3/H itself carries the AN designation and is listed among AEC-Q101-qualified parts (SMPC22AN to SMPC85AN). This makes SMPC78AN-M3/H suitable for engine control, body electronics, and ADAS sensor interfaces.
What does the "/H" suffix indicate in SMPC78AN-M3/H?
The "/H" suffix in SMPC78AN-M3/H specifies the preferred packaging option: 7-inch diameter plastic tape and reel, with a base quantity of 1500 units per reel. This is defined in the Ordering Information section (page 3) of the Vishay datasheet. The /H code ensures compatibility with standard SMT pick-and-place equipment and supports high-volume automated assembly. It does not affect electrical or thermal specifications - those remain identical to other SMPC78AN-M3 variants with different reel codes (e.g., /I).
How does the SMPC78AN-M3/H package differ from DO-214AC or SMA packages?
The SMPC78AN-M3/H uses the SMPC (TO-277A) package - a 3-terminal, dual-anode surface-mount outline measuring 4.80 × 3.70 × 1.10 mm - whereas DO-214AC (SMA) is a 2-terminal, single-anode package with ~2.5 mm height and larger footprint. TO-277A's dual-anode structure lowers inductance and improves surge current sharing, and its 1.1 mm profile enables ultra-thin module designs. SMPC78AN-M3/H's mechanical data is fully specified per JEDEC TO-277A standards in the Vishay datasheet, page 5.
What is the thermal resistance of SMPC78AN-M3/H when mounted on a standard FR4 PCB?
When mounted on a standard FR4 PCB with 2 oz copper and the recommended footprint, SMPC78AN-M3/H has a maximum junction-to-ambient thermal resistance (RθJA) of 100 °C/W, as specified in the Thermal Characteristics table (page 3) of the Vishay datasheet. Its typical RθJA is 85 °C/W. For heatsink-mounted configurations, the maximum junction-to-mount thermal resistance (RθJM) is 3 °C/W. These values are essential for calculating safe power derating above TA = 25 °C using Figure 2 in the datasheet.
SMPC78AN-M3/H 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/H FAQ
1.How can I place an order for SMPC78AN-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMPC78AN-M3/H 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/H reliable?
The price and inventory of SMPC78AN-M3/H 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/H is usually 5 days.
3.What payment methods are accepted for SMPC78AN-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMPC78AN-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMPC78AN-M3/H?
SMPC78AN-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMPC78AN-M3/H 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/H?
For technical support, including SMPC78AN-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMPC78AN-M3/H requirements.
6.How does Aetrix verify that SMPC78AN-M3/H is sourced from the original manufacturer or authorized distributors?
All SMPC78AN-M3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMPC78AN-M3/H?
All SMPC78AN-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMPC78AN-M3/H, 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/H part is unused and in its original packaging.
Return procedure for SMPC78AN-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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