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Vishay General Semiconductor - Diodes Division SMA6F28A-M3/I
- Part No.:
- SMA6F28A-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F28A-M3/I.pdf
- Description:
- 600W,28V 5%,UNIDIR,SLIM SMA TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,933
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Product details
Overview
SMA6F28A-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 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/I datasheet, SMA6F28A-M3/I pinout, SMA6F28A-M3/I application, or SMA6F28A-M3/I equivalent, this device is selected for robust overvoltage protection in space-constrained consumer, industrial, and telecom systems where low-profile mounting, automated assembly, and high-energy surge handling are critical.
Technical Context
This TVS diode operates as a unidirectional Zener-clamp device, triggered when reverse voltage exceeds VBR and limiting transient energy by shunting current to ground. Its dynamic resistance (RD) of 0.841 Ω enables precise clamping response under fast-rising surges like inductive switching events.
The device is rated for junction temperatures from –55 °C to +175 °C, with thermal resistance RθJA = 120–150 °C/W (FR4 PCB, 2 oz.), and meets MSL level 1 per J-STD-020 with 260 °C reflow peak. Polarity is marked by cathode band; terminals are matte tin-plated for solderability per J-STD-002 and JESD22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - Ensures reliable turn-on within tight tolerance across temperature |
| VC @ IPP | 45.5 V at 13.2 A (10/1000 μs) - Limits downstream IC voltage stress during 600 W surge events |
| PPPM (10×1000 μs) | 600 W - Sustains high-energy transients common in motor drives and relay switching |
| ID @ VWM | 0.2 μA max - Negligible leakage ensures minimal standby power loss in battery-powered systems |
| ESD Rating | IEC 61000-4-2 level 4: 15 kV air / 8 kV contact - Protects against human-body model discharges in handheld devices |
| Package | SlimSMA (DO-221AC), 0.95 mm typical height - Enables ultra-low-profile PCB layout in slim enclosures |
Pinout & Package
Package: SlimSMA (DO-221AC), surface-mount, unidirectional, cathode indicated by color band. Dimensions: 4.15–4.35 mm length × 2.50–2.70 mm width × 0.95 mm height (max). RoHS-compliant, halogen-free, M3 suffix meets JESD201 class 2 whisker test.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction; grounded reference during reverse clamping | Connected to system ground to provide low-impedance surge return path |
| Cathode | Current exit during forward conduction; protected line connection during reverse clamping | Connected to the line being protected (e.g., USB VBUS, sensor supply rail) |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile (0.95 mm typical height) | Enables use in ultra-thin consumer electronics and wearables without compromising board clearance |
| Peak pulse power: 600 W (10/1000 μs) | Handles repetitive inductive-switching surges in automotive body electronics and industrial PLC I/O modules |
| Clamping voltage ≤ 45.5 V at 13.2 A | Keeps protected 3.3 V/5 V/12 V rails safely below absolute maximum ratings of downstream MOSFETs and microcontrollers |
| MSL level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without preconditioning or special handling |
| Unidirectional configuration | Provides asymmetric protection ideal for DC power rails and single-polarity signal lines |
Applications
| USB Power Delivery Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protects USB-C VBUS lines from hot-swap surges and ESD events during plug insertion/removal. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBUS and GND, clamping transients faster than system-level protection ICs. Use Value: Prevents latch-up or damage to USB PD controllers and port power switches by limiting VBUS spikes to ≤45.5 V during 13.2 A surges. | Use Scenario: Shields analog output lines (e.g., 4–20 mA, 0–10 V) of pressure/temperature sensors from field-induced transients in factory automation. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted at connector entry point, absorbing 600 W surges before reaching precision ADC front-end. Use Value: Maintains signal integrity and prevents measurement corruption by suppressing >30 V transients within nanoseconds while adding <0.2 μA leakage. |
| Telecom DSL Line Interface | Automotive Body Control Module (BCM) |
Use Scenario: Guards ADSL/VDSL line drivers and receivers against lightning-induced surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Primary clamping device on line-side interface, coordinated with gas discharge tube (GDT) for staged protection. Use Value: Clamps 8/20 μs surges up to 4 kW without degradation, ensuring compliance with ITU-T K.21 basic protection requirements. | Use Scenario: Protects 12 V supply inputs to BCM microcontrollers and CAN transceivers from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Secondary TVS stage after primary load-dump suppressor, handling residual fast-edge spikes (<100 ns rise time). Use Value: Withstands 175 °C junction temperature and delivers stable clamping performance across –40 °C to +125 °C ambient conditions. |
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/H | Same electrical specs; differs only in tape-and-reel packaging (3500 pcs/reel vs. 14000 pcs/reel) | Identical circuit function and footprint; suited for lower-volume prototyping or small-batch production | Select SMA6F28A-M3/H for evaluation or pilot runs where reel size impacts pick-and-place efficiency |
| SMAJ28A-M3/5B | Higher clamping voltage (48.4 V vs. 45.5 V), same VWM (28 V), lower PPPM (400 W vs. 600 W), larger SMA (DO-214AC) package | Less effective clamping margin for 3.3 V/5 V logic; requires more PCB area; better suited for cost-sensitive, non-space-constrained designs | Choose SMAJ28A-M3/5B only if SlimSMA footprint is not required and clamping voltage margin ≥3 V is acceptable |
Compared with SMA6F28A-M3/I, SMA6F28A-M3/H offers identical protection performance in a smaller reel format, while SMAJ28A-M3/5B trades clamping precision and compactness for lower unit cost and wider availability-making the M3/I variant optimal for high-density, high-reliability production.
Availability
SMA6F28A-M3/I is available at Aetrix Electronics and suitable for USB power delivery interfaces, industrial sensor signal conditioning, telecom line interfaces, and automotive body control modules requiring stable component supply and consistent SlimSMA (DO-221AC) form factor.
Supply support for SMA6F28A-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, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, power handling, and miniaturization.
The SMA6F series is part of Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-energy, low-profile transient suppression in consumer, industrial, and telecom equipment where board space and surge robustness are co-constrained.
FAQ
What is the maximum clamping voltage of the SMA6F28A-M3/I under a 10/1000 μs surge?
The SMA6F28A-M3/I has a maximum clamping voltage (VC) of 45.5 V when subjected to a 13.2 A peak pulse current with a 10/1000 μs waveform. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on the protected line during standardized surge events. The SMA6F28A-M3/I maintains this clamping performance across its full operating temperature range, supporting robust design margins for 28 V nominal systems.
Does the SMA6F28A-M3/I meet automotive-grade reliability standards?
The SMA6F28A-M3/I is not AEC-Q200 qualified, but it operates across –55 °C to +175 °C junction temperature and supports reflow up to 260 °C (MSL level 1), making it suitable for under-hood and body-control applications where full qualification is not mandated. Its 0.2 μA leakage at 28 V and stable VBR temperature coefficient (αT = 9.8 × 10⁻⁴ /°C) ensure predictable behavior in thermally aggressive environments. For AEC-Q200-compliant alternatives, consult Vishay's Automotive TVS portfolio.
How does the SlimSMA (DO-221AC) package of the SMA6F28A-M3/I compare to standard SMA (DO-214AC)?
The SlimSMA (DO-221AC) package of the SMA6F28A-M3/I measures 4.15–4.35 mm × 2.50–2.70 mm × 0.95 mm (max), offering ~35 % lower height than standard SMA (DO-214AC) packages. This reduced profile enables placement beneath connectors and in stacked-board assemblies where vertical clearance is constrained. Electrical characteristics remain identical to same-voltage variants in larger packages, and the SMA6F28A-M3/I retains full compatibility with standard SMT pick-and-place equipment.
Can the SMA6F28A-M3/I be used for bidirectional transient protection?
No-the SMA6F28A-M3/I is strictly unidirectional and must not be used for bidirectional AC or symmetrical signal-line protection. Its cathode-band polarity and Zener-based structure allow conduction only in reverse bias above VBR; forward conduction behaves like a standard diode (~0.85 V VF). For bidirectional protection, Vishay offers the SMBJ28CA or SMCJ28CA series, which integrate back-to-back Zeners in a single package. Using SMA6F28A-M3/I in bidirectional roles risks failure during positive-going transients.
What is the thermal resistance junction-to-ambient (RθJA) for the SMA6F28A-M3/I on a standard FR4 PCB?
The SMA6F28A-M3/I has a typical RθJA of 120 °C/W and a maximum of 150 °C/W when mounted on a standard FR4 PCB with 2 oz. copper and the recommended pad layout per Vishay's DO-221AC footprint. This value assumes no additional heatsinking and governs safe power derating: at 55 °C ambient, its power dissipation must be limited to 8 W to maintain TJ ≤ 175 °C. Derating curves in the datasheet (Fig. 5) confirm linear reduction to zero at 150 °C ambient.
SMA6F28A-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):
- 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/I FAQ
1.How can I place an order for SMA6F28A-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F28A-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 SMA6F28A-M3/I reliable?
The price and inventory of SMA6F28A-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 SMA6F28A-M3/I is usually 5 days.
3.What payment methods are accepted for SMA6F28A-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F28A-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F28A-M3/I?
SMA6F28A-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F28A-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 SMA6F28A-M3/I?
For technical support, including SMA6F28A-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F28A-M3/I requirements.
6.How does Aetrix verify that SMA6F28A-M3/I is sourced from the original manufacturer or authorized distributors?
All SMA6F28A-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 SMA6F28A-M3/I meets industry standards.
7.What is the process for return or replacement of SMA6F28A-M3/I?
All SMA6F28A-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F28A-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 SMA6F28A-M3/I part is unused and in its original packaging.
Return procedure for SMA6F28A-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6F28A-M3/I Tags
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