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Vishay General Semiconductor - Diodes Division SMA6F78A-M3/I
- Part No.:
- SMA6F78A-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F78A-M3/I.pdf
- Description:
- 600W,78V 5%,UNIDIR,SLIM SMA TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,957
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Product details
Overview
SMA6F78A-M3/I 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/I datasheet, SMA6F78A-M3/I pinout, SMA6F78A-M3/I application, or SMA6F78A-M3/I equivalent, this device is selected for robust overvoltage protection in automotive infotainment power rails, industrial sensor interfaces, telecom line cards, and DC-DC converter input stages where low-profile mounting and high surge immunity are required.
Technical Context
This TVS diode operates as a unidirectional Zener-clamping device, activated when reverse voltage exceeds VBR (86.7–95.8 V). Its dynamic resistance (RD = 6.08 Ω) and low clamping ratio (VC/VBR ≈ 1.30) ensure rapid, predictable voltage limiting during transient events such as inductive switching or lightning-induced surges.
It is rated for 600 W (10/1000 μs) and 4 kW (8/20 μs) peak pulse power, with thermal resistance RθJA = 120–150 °C/W on FR4 PCB and junction temperature range of –55 °C to +175 °C - enabling reliable operation in harsh environments without active cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - precise Zener breakdown threshold defining turn-on sensitivity |
| VC @ IPP | 125 V at 4.8 A (10/1000 μs) - clamped voltage seen by protected circuit during standard surge |
| PPPM (10/1000 μs) | 600 W - surge energy handling capacity aligned with IEC 61000-4-5 waveform requirements |
| ID @ VWM | 0.2 μA max - negligible leakage current preserving system efficiency in standby mode |
| TJ max. | +175 °C - enables use in under-hood automotive or high-temperature industrial enclosures |
| ESD Rating | IEC 61000-4-2 Level 4: 15 kV air / 8 kV contact - meets stringent end-equipment ESD immunity standards |
Pinout & Package
Package: SlimSMA (DO-221AC), ultra-low profile (0.95 mm typical height), halogen-free, RoHS-compliant, MSL Level 1, matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias; grounded reference in unidirectional TVS configuration | Connected to system ground or low-impedance return path to enable clamping action |
| Cathode | Current exit terminal during reverse conduction; marked by color band | Connected to protected line (e.g., 78 V rail); conducts surge current to ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile (0.95 mm) | Enables placement in space-constrained modules like automotive ADAS ECUs and portable telecom equipment |
| Peak pulse power: 600 W (10/1000 μs) | Provides certified surge immunity for IEC 61000-4-5 compliance in industrial power inputs |
| IEC 61000-4-2 Level 4 ESD | Eliminates need for additional discrete ESD protection on exposed ports (e.g., USB, RS-485) |
| Unidirectional operation | Prevents unwanted conduction during normal forward-biased conditions in DC power paths |
| MSL Level 1, 260 °C reflow compatible | Supports standard SMT assembly without moisture sensitivity concerns or baking requirements |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 78 V auxiliary power supply in vehicle infotainment head units from load-dump transients and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 78 V rail and chassis ground to clamp surges above 95.8 V. Use Value: Limits voltage excursion to ≤125 V during 4.8 A transients, preventing damage to downstream DC-DC converters and microcontrollers. | Use Scenario: Safeguarding analog output lines of 4–20 mA pressure sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: TVS connected across sensor output and ground to absorb ESD and cable discharge events. Use Value: Withstands 15 kV air-gap ESD strikes while adding <1 pF capacitance, preserving signal integrity up to 1 MHz. |
| Telecom Line Card Surge Protection | DC-DC Converter Input Stage |
Use Scenario: Front-end protection for AC/DC rectified bus in telecom base station power supplies subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Mounted at board edge to shunt 8/20 μs surges (up to 4 kW) into ground plane before reaching primary FETs. Use Value: Clamps 8/20 μs surges to ≤163 V at 24.6 A, meeting GR-1089-CORE Level 3 telecom surge requirements. | Use Scenario: Input-side transient suppression for isolated 78 V input buck converters in railway signaling systems. IC Role / Device Role / Timing Role: Placed directly at converter input capacitor to limit voltage overshoot during hot-swap or inrush events. Use Value: 6.08 Ω dynamic resistance ensures fast response (<1 ns), holding input voltage within ±5% of 78 V rating during 10/1000 μs transients. |
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/H | Same electrical specs; differs only in tape-and-reel packaging (3500 pcs/reel vs. 14000 pcs/reel) | No functional difference; selection driven by production volume and pick-and-place feeder compatibility | Choose SMA6F78A-M3/H for low-volume prototyping or small-batch builds requiring 7" reels |
| SMA6F85A-M3/I | Higher VWM (85 V), VBR (94.4–104 V), VC (136 V); same package and surge ratings | Better suited for 85 V nominal systems; not interchangeable in 78 V designs due to higher turn-on threshold | Select SMA6F85A-M3/I only if system nominal voltage and margin analysis justify 7 V higher clamping onset |
Compared with SMA6F78A-M3/I, SMA6F78A-M3/H offers identical protection performance in smaller reel format for flexibility, while SMA6F85A-M3/I provides higher voltage headroom at the cost of reduced clamping margin - making SMA6F78A-M3/I optimal for precisely regulated 78 V rails requiring tight overvoltage control.
Availability
SMA6F78A-M3/I is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor interfaces, telecom line cards, and DC-DC converter input stages requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMA6F78A-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and high-power density.
The SMA6F series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure where compact size, high surge capability, and AEC-Q200 readiness are critical.
FAQ
What is the maximum clamping voltage of the SMA6F78A-M3/I under a 10/1000 μs surge?
The SMA6F78A-M3/I has a maximum clamping voltage (VC) of 125 V at 4.8 A for a 10/1000 μs waveform. This value is measured per standard test conditions and reflects the peak voltage imposed on the protected circuit during that transient event. The SMA6F78A-M3/I maintains this clamping performance across its specified operating temperature range and is validated per JEDEC test methods.
Is the SMA6F78A-M3/I suitable for automotive applications?
Yes, the SMA6F78A-M3/I is widely used in automotive applications including infotainment power rails and body control modules. Its –55 °C to +175 °C operating junction temperature range, MSL Level 1 reflow compatibility, and robust 600 W surge rating meet key requirements for under-hood and cabin-mounted electronics. While not AEC-Q200 certified by default, it is commonly qualified by Tier 1 suppliers for specific vehicle platforms. The SMA6F78A-M3/I supports these deployments with proven field reliability.
Does the SMA6F78A-M3/I have bidirectional or unidirectional polarity?
The SMA6F78A-M3/I is a unidirectional TVS diode, meaning it conducts only in reverse bias above its breakdown voltage and blocks current in forward bias. Polarity is indicated by a cathode band on the SlimSMA package. This architecture prevents interference with normal DC forward operation - a critical feature for protecting positive power rails like the 78 V supply targeted by the SMA6F78A-M3/I.
What is the leakage current specification for the SMA6F78A-M3/I at its stand-off voltage?
At its 78 V stand-off voltage (VWM), the SMA6F78A-M3/I exhibits a maximum reverse leakage current (ID) of 0.2 μA at 25 °C. This ultra-low leakage preserves system efficiency in always-on circuits and avoids false triggering in high-impedance sensing nodes. The SMA6F78A-M3/I maintains this performance across its full temperature range, with leakage increasing predictably per datasheet derating curves.
Can the SMA6F78A-M3/I be used in place of SMA6F75A-M3/I?
No - the SMA6F78A-M3/I is not a direct replacement for SMA6F75A-M3/I due to differing voltage ratings: SMA6F75A-M3/I has VWM = 75 V and VBR = 83.3–92.1 V, while SMA6F78A-M3/I is rated for VWM = 78 V and VBR = 86.7–95.8 V. Substituting them risks inadequate clamping (if VWM too high) or premature conduction (if VWM too low). System-level validation is required before interchanging any SMA6F78A-M3/I with other variants in the family.
SMA6F78A-M3/I 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/I FAQ
1.How can I place an order for SMA6F78A-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F78A-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 SMA6F78A-M3/I reliable?
The price and inventory of SMA6F78A-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 SMA6F78A-M3/I is usually 5 days.
3.What payment methods are accepted for SMA6F78A-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F78A-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F78A-M3/I?
SMA6F78A-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F78A-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 SMA6F78A-M3/I?
For technical support, including SMA6F78A-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F78A-M3/I requirements.
6.How does Aetrix verify that SMA6F78A-M3/I is sourced from the original manufacturer or authorized distributors?
All SMA6F78A-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 SMA6F78A-M3/I meets industry standards.
7.What is the process for return or replacement of SMA6F78A-M3/I?
All SMA6F78A-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F78A-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 SMA6F78A-M3/I part is unused and in its original packaging.
Return procedure for SMA6F78A-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6F78A-M3/I Tags
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