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Vishay General Semiconductor - Diodes Division SMA6F78A-M3/H
- Part No.:
- SMA6F78A-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F78A-M3/H.pdf
- Description:
- 600W,78V 5%,UNIDIR,SLIM SMA TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,609
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Product details
Overview
SMA6F78A-M3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SlimSMA (DO-221AC) package, designed for clamping voltage transients on power and signal lines. It features 78 V stand-off voltage (VWM), 86.7–95.8 V breakdown voltage (VBR), 125 V maximum clamping voltage (VC) at 4.8 A (10/1000 μs), 600 W peak pulse power, and IEC 61000-4-2 Level 4 ESD protection (15 kV air / 8 kV contact).
For engineers reviewing the SMA6F78A-M3/H datasheet, SMA6F78A-M3/H pinout, SMA6F78A-M3/H application, or SMA6F78A-M3/H equivalent, this device is selected for robust overvoltage protection in automotive power supplies, industrial sensor interfaces, telecom line cards, and DC-DC converter input rails where low-profile mounting and high surge immunity are required.
Technical Context
This TVS diode operates as a unidirectional clamping device, activated when reverse voltage exceeds its VBR range (86.7–95.8 V at 1 mA). Its dynamic resistance (RD) is 6.08 Ω, enabling predictable clamping behavior under transient stress. The device uses Zener avalanche breakdown and is rated for junction temperatures up to +175 °C.
It is optimized for 10/1000 μs and 8/20 μs surge waveforms, delivering 600 W (10/1000 μs) and 4 kW (8/20 μs) peak pulse power. Thermal resistance junction-to-ambient is 120–150 °C/W on FR4 PCB, supporting reliable operation without heatsinking in moderate-power applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Ensures precise turn-on threshold with ±5% tolerance |
| VC @ IPP | 125 V at 4.8 A (10/1000 μs) - Limits downstream voltage during surge to safe level |
| PPPM (10/1000 μs) | 600 W - Sustains standard lightning-surge energy without failure |
| ID @ VWM | 0.2 μA max - Negligible leakage current preserves system efficiency |
| TJ max | +175 °C - Enables use in under-hood automotive or high-temperature industrial environments |
| ESD Rating | IEC 61000-4-2 Level 4: 15 kV air / 8 kV contact - Protects against human-body ESD events |
Pinout & Package
Package: SlimSMA (DO-221AC), ultra-low profile (0.95 mm typical height), halogen-free, RoHS-compliant, MSL Level 1, matte tin-plated terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; cathode referenced ground in unidirectional clamp configuration | Connected to protected line (e.g., +12 V rail); clamps to cathode when overvoltage occurs |
| Cathode | Current exit terminal in forward bias; reference node tied to system ground or lower potential rail | Provides low-impedance path to ground during transient; color band denotes this end |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile (0.95 mm height) | Enables placement in space-constrained modules such as automotive ECUs and portable telecom equipment |
| Peak pulse power: 600 W (10/1000 μs) | Withstands IEC 61000-4-5 surge test levels common in industrial power inputs |
| Unidirectional polarity | Prevents forward conduction during normal operation while providing reverse surge clamping |
| MSL Level 1, 260 °C reflow compatible | Supports lead-free automated assembly without moisture-related popcorning risk |
| IEC 61000-4-2 Level 4 ESD rating | Meets stringent electrostatic discharge immunity requirements for field-deployed electronics |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed control modules from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between power rail and ground. Use Value: Clamps transients up to 125 V at 4.8 A, preventing damage to MCU power pins and CAN transceivers. | Use Scenario: Shielding analog and digital signal lines (e.g., 4–20 mA, RS-485) from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Standoff-protection element on sensor output traces near connector entry points. Use Value: Sub-1 μA leakage at 78 V ensures minimal impact on precision current-loop accuracy. |
| Telecom Line Card Surge Protection | DC-DC Converter Input Stage |
Use Scenario: Safeguarding primary-side circuitry of PoE-powered line cards against lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level transient suppressor on DC input bus prior to DC-DC regulation. Use Value: 4 kW (8/20 μs) rating handles telecom-grade surge waveforms per GR-1089-CORE. | Use Scenario: Input overvoltage protection for isolated 48 V to 5 V/3.3 V converters in networking equipment. IC Role / Device Role / Timing Role: Clamp component absorbing energy from upstream supply faults or hot-swap events. Use Value: 120–150 °C/W thermal resistance allows stable operation without heatsink on standard 2 oz. FR4 layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6F78A-M3/6B | Same electrical specs; differs only in tape-and-reel packaging (13" reel vs. 7" reel for /H) | No functional difference; identical performance in circuit | Select /H for standard 7" reel volume production; /6B for high-volume automated placement requiring larger reels |
| SMAJ78A-M3/5B | Higher 400 W PPPM (10/1000 μs); same VWM/VBR/VC; DO-214AC (SMA) package (1.5 mm taller) | Lower surge rating; larger footprint may limit board space reuse | Choose SMAJ78A-M3/5B only if SlimSMA height constraint is not applicable and legacy SMA footprint exists |
Compared with SMA6F78A-M3/H, the /6B variant offers identical protection performance in alternate packaging, while SMAJ78A-M3/5B trades 33% lower surge capability and increased height for broader industry footprint familiarity-neither is pin-compatible due to SlimSMA's unique DO-221AC outline.
Availability
SMA6F78A-M3/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom line card surge suppression, and DC-DC converter input stage protection requiring stable component supply across multi-year production cycles.
Supply support for SMA6F78A-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, TVS devices, and optoelectronics with emphasis on reliability and high-volume manufacturability.
The SMA6F series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for surface-mount surge protection in automotive, industrial, and telecom systems demanding low-profile, high-energy clamping and AEC-Q200 readiness.
FAQ
What is the maximum clamping voltage of the SMA6F78A-M3/H under a 10/1000 μs surge?
The SMA6F78A-M3/H has a maximum clamping voltage (VC) of 125 V when subjected to a 4.8 A peak pulse current with a 10/1000 μs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMA6F78A-M3/H maintains this clamping performance across its specified operating temperature range.
Is the SMA6F78A-M3/H suitable for automotive applications?
Yes, the SMA6F78A-M3/H is suitable for automotive applications including power rail protection in engine control units and body electronics. Its 175 °C maximum junction temperature, MSL Level 1 reflow compatibility, and robust 600 W (10/1000 μs) surge rating align with AEC-Q200 stress test expectations. The SMA6F78A-M3/H is widely deployed in 12 V and 24 V systems for load-dump and ISO 7637-2 transient suppression.
Does the SMA6F78A-M3/H have bidirectional capability?
No, the SMA6F78A-M3/H is a unidirectional TVS diode, meaning it provides transient suppression only in the reverse-bias direction. Forward conduction occurs above ~1.2 V, but clamping action is specified and guaranteed only for reverse overvoltage events. For bidirectional protection, a separate device such as SMA6F78CA-M3/H would be required.
What is the leakage current specification for the SMA6F78A-M3/H at its stand-off voltage?
The SMA6F78A-M3/H exhibits a maximum reverse leakage current (ID) of 0.2 μA at its 78 V stand-off voltage (VWM), measured at 25 °C. This ultralow leakage ensures minimal power loss and avoids interference with sensitive analog or low-power circuits, making the SMA6F78A-M3/H appropriate for always-on monitoring nodes and battery-backed systems.
How does the SlimSMA (DO-221AC) package of the SMA6F78A-M3/H compare to standard SMA (DO-214AC)?
The SlimSMA (DO-221AC) package of the SMA6F78A-M3/H measures 0.95 mm typical height versus 2.29 mm for standard SMA (DO-214AC), reducing vertical space by >58%. While both share similar length/width footprints, SlimSMA requires dedicated land patterns and stencil designs. The SMA6F78A-M3/H is not a drop-in replacement for DO-214AC devices due to mechanical incompatibility.
SMA6F78A-M3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-221AC, SMA Flat Leads
- 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:
- 125V
- Current - Peak Pulse (10/1000µs):
- 4.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-221AC (SlimSMA)
SMA6F78A-M3/H FAQ
1.How can I place an order for SMA6F78A-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F78A-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 SMA6F78A-M3/H reliable?
The price and inventory of SMA6F78A-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 SMA6F78A-M3/H is usually 5 days.
3.What payment methods are accepted for SMA6F78A-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F78A-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F78A-M3/H?
SMA6F78A-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F78A-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 SMA6F78A-M3/H?
For technical support, including SMA6F78A-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F78A-M3/H requirements.
6.How does Aetrix verify that SMA6F78A-M3/H is sourced from the original manufacturer or authorized distributors?
All SMA6F78A-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 SMA6F78A-M3/H meets industry standards.
7.What is the process for return or replacement of SMA6F78A-M3/H?
All SMA6F78A-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F78A-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 SMA6F78A-M3/H part is unused and in its original packaging.
Return procedure for SMA6F78A-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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