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Vishay General Semiconductor - Diodes Division SMPC78ANHM3/H
- Part No.:
- SMPC78ANHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
SMPC78ANHM3/H.pdf
- Description:
- TVS DIODE 78VWM 126VC TO277A
- Quantity:
- Payment:
- Shipping:
Inventory:9,059
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Product details
Overview
SMPC78ANHM3/H from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor in SMPC (TO-277A) package, with 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 and sensor signal lines in automotive powertrain control units against inductive switching transients.
For engineers reviewing the SMPC78ANHM3/H datasheet, SMPC78ANHM3/H pinout, SMPC78ANHM3/H application, or SMPC78ANHM3/H equivalent, this AEC-Q101 qualified TVS diode delivers verified clamping performance at 126 V under 10/1000 μs surge, supports automated SMT placement, and meets J-STD-020 MSL Level 1 with 260 °C reflow peak.
Technical Context
This device operates as a unidirectional avalanche diode, leveraging silicon junction technology to clamp transient overvoltages above its VWM of 78.0 V while maintaining <1.0 μA reverse leakage at rated standoff. Its low incremental surge resistance ensures stable clamping voltage (VC = 126 V) across full IPPM range.
The SMPC78ANHM3/H uses a dual-anode/single-cathode configuration in TO-277A package, enabling symmetrical thermal path to PCB copper when mounted with cathode on heatsink - critical for sustained 1.25 W power dissipation at TA = 25 °C and TJ max = 150 °C operation.
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 IT = 1.0 mA - Confirmed avalanche onset window for design margining |
| VC @ IPPM | 126 V at 11.9 A, 10/1000 μs - Clamped voltage seen by protected IC during worst-case surge |
| PPPM | 1500 W - Peak transient energy absorption capability per JEDEC standard waveform |
| IR @ VWM | ≤1.0 μA - Negligible standby leakage, preserving signal integrity on high-impedance lines |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments without derating |
| RθJA | 100 °C/W - Thermal resistance defining temperature rise on standard FR4, 2 oz. copper footprint |
Pinout & Package
Package: SMPC (TO-277A), 3-terminal surface-mount case with matte tin-plated leads, 1.1 mm typical height, UL 94 V-0 molding compound, and cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 | Primary current entry during forward conduction | Connected to protected line; forms low-impedance path to cathode during clamping |
| Anode 2 | Secondary current entry terminal | Electrically tied to Anode 1 internally; enables dual-side PCB layout routing |
| Cathode | Clamping reference and surge return path | Marked with band; must be connected to ground or low-impedance return plane for effective suppression |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive powertrain and body electronics per stress test requirements |
| MSL Level 1 rating | Zero floor life limitation; supports unlimited exposure to ambient prior to reflow |
| Low profile (1.1 mm) | Enables use in space-constrained modules such as ECU daughterboards and sensor housings |
| Dual-anode symmetry | Permits flexible PCB trace routing without polarity sensitivity on anode side |
| Halogen-free & RoHS | Complies with automotive environmental directives and end-of-life recycling mandates |
Applications
| Automotive Powertrain Control | Industrial Motor Drive Protection |
|---|---|
Use Scenario: Suppressing inductive kickback from fuel injector solenoids and ignition coils in engine control units. IC Role / Device Role / Timing Role: Unidirectional TVS placed across coil driver outputs to clamp flyback spikes before they reach gate drivers or microcontrollers. Use Value: Prevents latch-up or permanent damage to 5 V logic interfaces by limiting transient voltage to ≤126 V during 11.9 A surges. |
Use Scenario: Protecting IGBT gate drive signals in variable-frequency drives subjected to bus voltage transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on isolated gate drive lines to absorb coupling noise from high-dI/dt switching events. Use Value: Maintains gate oxide integrity by holding VGS below absolute maximum rating during 1500 W surge events. |
| Automotive Sensor Signal Lines | Telecom DC Power Input |
Use Scenario: Shielding LIN/CAN node analog sensor inputs (e.g., pressure, temperature) from battery dump and load dump events. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 μA) TVS on 12 V supply rails feeding sensor front-ends to avoid signal offset drift. Use Value: Ensures sensor accuracy remains unaffected during long-term operation due to minimal reverse bias current. |
Use Scenario: Safeguarding PoE-powered equipment input stages against lightning-induced surges on 48 V DC distribution lines. IC Role / Device Role / Timing Role: Primary-level clamping device upstream of DC-DC converters to limit input rail overshoot. Use Value: Reduces need for secondary-stage TVS by absorbing >90% of 10/1000 μs surge energy before downstream regulation. |
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 | DO-214AC package; 78 V VWM; 1500 W PPPM; higher RθJA (150 °C/W); no AEC-Q101 qualification | Industrial-grade only; unsuitable for automotive under-hood mounting without thermal derating | Select when cost-sensitive industrial designs prioritize footprint compatibility over automotive qualification |
| 1.5KE78A | DO-201AD axial lead; same VWM and PPPM; 2.5× larger height; not SMT-compatible; no MSL rating | Prototyping or through-hole legacy systems; incompatible with automated assembly lines | Choose only for manual-rework scenarios where board real estate and reflow process are non-constraints |
Compared with SMAJ78A-E3/5A and 1.5KE78A, the SMPC78ANHM3/H provides AEC-Q101 assurance, MSL Level 1 compliance, and optimized thermal path for SMT automotive production - making it the sole option qualified for volume deployment in engine control modules requiring zero rework risk.
Availability
SMPC78ANHM3/H is available at Aetrix Electronics and suitable for automotive powertrain control, industrial motor drives, sensor interface protection, and telecom DC input protection requiring stable component supply across multi-year production cycles.
Supply support for SMPC78ANHM3/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, and transient protection devices with emphasis on reliability and automotive-grade validation.
The SMPC series was engineered specifically for high-energy transient suppression in space-constrained, thermally demanding automotive and industrial environments - prioritizing low-profile packaging, AEC-Q101 compliance, and repeatable clamping performance.
FAQ
What is the clamping voltage of SMPC78ANHM3/H under a 10/1000 μs surge?
The SMPC78ANHM3/H has a maximum clamping voltage (VC) of 126 V when subjected to its rated peak pulse current of 11.9 A using the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 89116 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMPC78ANHM3/H maintains this clamping performance consistently across its operational temperature range.
Is SMPC78ANHM3/H qualified for automotive applications?
Yes, SMPC78ANHM3/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation stating AEC-Q101 qualification applies to SMPC22AN through SMPC85AN variants. This qualification covers stress tests including HTGB, AC/DC life test, and temperature cycling - validating suitability for under-hood automotive electronics such as engine control units and transmission controllers.
What does the "H" in SMPC78ANHM3/H indicate?
The "H" in SMPC78ANHM3/H is the preferred package code denoting 7-inch diameter plastic tape and reel delivery mode with 1500 units per reel, as specified in Vishay's ordering information table. It is distinct from "I", which indicates 13-inch reels with 6500 units. The "H" code ensures compatibility with standard SMT pick-and-place feeders used in high-volume automotive manufacturing lines.
How does the dual-anode configuration of SMPC78ANHM3/H benefit PCB layout?
The dual-anode structure (Anode 1 and Anode 2) in SMPC78ANHM3/H allows symmetric trace routing on either side of the device, reducing loop inductance and easing layout in tight spaces like ECU modules. Both anodes are internally shorted, eliminating polarity constraints on the anode side and simplifying routing decisions without compromising clamping performance or surge current sharing.
What is the thermal resistance from junction to ambient for SMPC78ANHM3/H?
The maximum junction-to-ambient thermal resistance (RθJA) for SMPC78ANHM3/H is 100 °C/W when mounted on a standard FR4 PCB with 2 oz. copper and the recommended pad layout. This value, per JEDEC 51-2A, determines temperature rise under steady-state power dissipation and guides thermal design for applications operating near the 1.25 W PD limit at elevated ambient temperatures.
SMPC78ANHM3/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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-277A (SMPC)
SMPC78ANHM3/H FAQ
1.How can I place an order for SMPC78ANHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMPC78ANHM3/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 SMPC78ANHM3/H reliable?
The price and inventory of SMPC78ANHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMPC78ANHM3/H is usually 5 days.
3.What payment methods are accepted for SMPC78ANHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMPC78ANHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMPC78ANHM3/H?
SMPC78ANHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMPC78ANHM3/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 SMPC78ANHM3/H?
For technical support, including SMPC78ANHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMPC78ANHM3/H requirements.
6.How does Aetrix verify that SMPC78ANHM3/H is sourced from the original manufacturer or authorized distributors?
All SMPC78ANHM3/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 SMPC78ANHM3/H meets industry standards.
7.What is the process for return or replacement of SMPC78ANHM3/H?
All SMPC78ANHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMPC78ANHM3/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 SMPC78ANHM3/H part is unused and in its original packaging.
Return procedure for SMPC78ANHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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