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Vishay General Semiconductor - Diodes Division SMA6F28A-M3/H
- Part No.:
- SMA6F28A-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F28A-M3/H.pdf
- Description:
- 600W,28V 5%,UNIDIR,SLIM SMA TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,000
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Product details
Overview
SMA6F28A-M3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SlimSMA (DO-221AC) package, designed for clamping voltage transients on power and signal lines. It features 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.5 V maximum clamping voltage (VC) at 13.2 A (10/1000 μs), 600 W peak pulse power, and ESD immunity per IEC 61000-4-2 level 4 (15 kV air / 8 kV contact).
For engineers reviewing the SMA6F28A-M3/H datasheet, SMA6F28A-M3/H pinout, SMA6F28A-M3/H application, or SMA6F28A-M3/H equivalent, key selection criteria include clamping performance under 10/1000 μs surges, thermal derating on FR4 PCBs, unidirectional polarity for DC-biased lines, and M3 halogen-free RoHS-compliant construction suitable for automated SMT assembly.
Technical Context
This TVS diode operates as a Zener-based overvoltage protection device with unidirectional conduction-cathode band denotes the protected line side. Its dynamic resistance (RD) is 0.841 Ω, enabling low-voltage overshoot during transient events, and its voltage temperature coefficient (αT) is +9.8 × 10⁻⁴ /°C, ensuring predictable VBR drift across -55 °C to +175 °C operating junction range.
It delivers 600 W peak pulse power (10/1000 μs) and 4 kW (8/20 μs), with thermal resistance junction-to-ambient (RθJA) up to 150 °C/W on standard FR4 PCBs. The device meets J-STD-020 MSL level 1 and withstands 260 °C lead-free reflow, supporting high-reliability industrial and telecom designs requiring robust ESD and surge immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse working voltage before clamping begins |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - ensures reliable turn-on above normal operating voltage |
| VC @ IPP | 45.5 V at 13.2 A (10/1000 μs) - limits transient voltage seen by downstream ICs |
| PPPM (10/1000 μs) | 600 W - sustains short-duration surges without failure on typical PCB layouts |
| ID @ VWM | 0.2 μA - negligible leakage current preserves power efficiency in standby mode |
| TJ max. | +175 °C - supports operation in high-temperature environments like automotive engine bays |
| ESD Rating | IEC 61000-4-2 level 4: 15 kV air / 8 kV contact - protects against human-body model discharges |
Pinout & Package
Package: SlimSMA (DO-221AC), ultra-low-profile surface-mount case with 0.95 mm typical height, matte tin-plated leads, halogen-free and RoHS-compliant (M3 suffix), cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or common return path; defines unidirectional clamping direction |
| Cathode | Protected line terminal | Connected to the line being safeguarded (e.g., 24 V rail or sensor input); marked by color band |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low profile (0.95 mm) | Enables use in space-constrained consumer and portable electronics without compromising board clearance |
| 600 W peak pulse power (10/1000 μs) | Handles common lightning-induced and inductive-switching transients in industrial control inputs |
| Dynamic resistance of 0.841 Ω | Minimizes clamping voltage rise under high-current surges, improving protection margin for 3.3 V/5 V logic |
| MSL level 1, 260 °C peak reflow | Supports single-pass lead-free assembly without moisture-related popcorning or delamination |
| IEC 61000-4-2 level 4 ESD | Provides system-level ESD immunity for USB, RS-485, and sensor interfaces exposed to user handling |
Applications
| Industrial PLC Input Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers from relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input terminal and ground, absorbing >1 kV transients before they reach input buffer ICs. Use Value: Prevents latch-up or permanent damage to microcontroller GPIOs while maintaining <100 ns response time and <46 V clamping ceiling. | Use Scenario: Safeguarding LIN bus transceiver inputs and power supply rails in door module ECUs subjected to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across VBAT and GND, triggered only during overvoltage events exceeding 28 V. Use Value: Ensures compliance with ISO 7637-2 pulse 1/2a/3a requirements and extends lifetime of 5 V LDO regulators and CAN/LIN PHYs. |
| Telecom Power Supply Input | Consumer Sensor Interface Protection |
Use Scenario: Front-end surge suppression on 48 V DC input of PoE-powered network switches and base stations. IC Role / Device Role / Timing Role: Primary clamping device in multi-stage protection circuit, coordinated with MOVs and gas discharge tubes. Use Value: Limits let-through voltage to <50 V during 8/20 μs surges up to 4 kW, preserving integrity of secondary DC-DC converters. | Use Scenario: ESD hardening of analog outputs from MEMS pressure sensors in smart home thermostats and HVAC controls. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS placed directly at connector pins to shunt HBM discharges before reaching ADC front-end. Use Value: Maintains signal fidelity (<0.5 pF junction capacitance at zero bias) while passing IEC 61000-4-2 ±15 kV air discharge testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6F28A-M3/6B | Same electrical specs; differs only in tape-and-reel packaging (13" reel vs. 7" reel for /H) | No functional difference; identical placement and soldering behavior | Select /H for smaller reels compatible with compact SMT feeders; /6B for high-volume production runs |
| SMAJ28A-M3/5B | Higher RθJA (175 °C/W), lower PPPM (400 W), same VWM/VBR/VC but larger SMA package (DO-214AC) | Less effective on dense PCBs due to higher thermal impedance; requires more layout area | Choose SMA6F28A-M3/H when board space and thermal performance on FR4 are critical; SMAJ28A-M3/5B only if legacy footprint reuse is mandatory |
Compared with SMA6F28A-M3/6B, the /H variant offers identical protection performance in a smaller reel format optimized for flexible manufacturing. Against SMAJ28A-M3/5B, SMA6F28A-M3/H delivers 50 % higher surge power rating and 15 % lower thermal resistance in a 30 % smaller footprint-critical for modern miniaturized power interfaces.
Availability
SMA6F28A-M3/H is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and telecom infrastructure requiring stable component supply with guaranteed long-term continuity and traceable sourcing.
Supply support for SMA6F28A-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, precision, and high-volume manufacturability.
The SMA6F series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power, low-profile transient suppression in space-constrained, high-reliability applications across industrial, automotive, and communications markets.
FAQ
What is the maximum clamping voltage of the SMA6F28A-M3/H under a 10/1000 μs surge?
The SMA6F28A-M3/H has a maximum clamping voltage (VC) of 45.5 V at 13.2 A under a 10/1000 μs waveform. This value is measured per standardized test conditions and represents the peak voltage imposed on the protected circuit during that transient event. The SMA6F28A-M3/H maintains this clamping performance across its specified operating temperature range and is validated per JEDEC test methods.
Does the SMA6F28A-M3/H support lead-free reflow soldering?
Yes, the SMA6F28A-M3/H meets J-STD-020 MSL level 1 and is rated for a maximum lead-free reflow peak temperature of 260 °C. Its matte tin-plated terminals comply with J-STD-002 and JESD22-B102 solderability standards, and the M3 suffix confirms qualification to JESD 201 class 2 whisker testing-ensuring robust interconnect reliability after assembly.
Is the SMA6F28A-M3/H unidirectional or bidirectional?
The SMA6F28A-M3/H is a unidirectional TVS diode, as confirmed by Vishay's official datasheet and product marking code "6CG". It functions as a Zener-type clamp with cathode (marked by color band) connected to the protected line and anode to ground, making it suitable for DC-biased circuits where reverse polarity protection is not required.
What is the junction-to-ambient thermal resistance (RθJA) of the SMA6F28A-M3/H on a standard PCB?
The SMA6F28A-M3/H has a maximum junction-to-ambient thermal resistance (RθJA) of 150 °C/W when mounted on a standard FR4 PCB with 2 oz. copper and the recommended footprint. This value is defined per JEDEC 51-2A and is used to calculate safe power derating above 25 °C ambient-critical for sustained surge duty cycles in enclosed enclosures.
Can the SMA6F28A-M3/H replace SMAJ28A in existing designs?
The SMA6F28A-M3/H is not a direct footprint replacement for SMAJ28A due to differing packages: SMA6F28A-M3/H uses SlimSMA (DO-221AC), while SMAJ28A uses SMA (DO-214AC). Though both share the same VWM and VC ratings, the SlimSMA package is 30 % smaller and 40 % lower in height. Layout redesign is required to adopt SMA6F28A-M3/H, but the improved thermal and surge performance justifies the change in new designs.
SMA6F28A-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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.5V
- Current - Peak Pulse (10/1000µs):
- 13.2A
- 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)
SMA6F28A-M3/H FAQ
1.How can I place an order for SMA6F28A-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F28A-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 SMA6F28A-M3/H reliable?
The price and inventory of SMA6F28A-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 SMA6F28A-M3/H is usually 5 days.
3.What payment methods are accepted for SMA6F28A-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F28A-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F28A-M3/H?
SMA6F28A-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F28A-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 SMA6F28A-M3/H?
For technical support, including SMA6F28A-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F28A-M3/H requirements.
6.How does Aetrix verify that SMA6F28A-M3/H is sourced from the original manufacturer or authorized distributors?
All SMA6F28A-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 SMA6F28A-M3/H meets industry standards.
7.What is the process for return or replacement of SMA6F28A-M3/H?
All SMA6F28A-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F28A-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 SMA6F28A-M3/H part is unused and in its original packaging.
Return procedure for SMA6F28A-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6F28A-M3/H Tags
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