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STMicroelectronics SMA6F28A
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- Part No.:
- SMA6F28A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F28A.pdf
- Description:
- TVS DIODE 28VWM 45.4VC SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:4,392
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Product details
Overview
SMA6F28A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode designed for robust ESD and surge protection in DC power rails and signal lines. It features a 28 V stand-off voltage (VRM), 31.1–34.3 V breakdown voltage (VBR), and clamps transients to ≤45.4 V at 13.8 A (10/1000 µs), operating reliably up to +175 °C junction temperature in automotive and industrial power supplies.
For engineers reviewing the SMA6F28A datasheet, SMA6F28A pinout, SMA6F28A application, or SMA6F28A equivalent, key selection criteria include clamping voltage vs. peak current, leakage current stability across temperature (0.2 µA @ 25 °C, 1 µA @ 85 °C), unidirectional polarity, and SMA flat package compatibility with IPC7531 footprints and JEDEC-standard reflow profiles.
Technical Context
This TVS diode uses planar silicon technology to achieve low dynamic resistance (0.363 Ω) and stable voltage temperature coefficient (9.8 × 10⁻⁴ /°C), enabling precise clamping under repeated surges. Its IEC 61000-4-2 compliance exceeds Level 4 (±25 kV contact / ±30 kV air discharge), making it suitable for high-reliability interfaces exposed to human-body-model ESD events.
The device operates over –55 °C to +175 °C junction range and maintains ≤1 µA leakage at elevated temperatures-critical for battery-backed or thermally constrained systems. Its 600 W (10/1000 µs) and 4 kW (8/20 µs) peak pulse power ratings support both slow-energy and fast-rising surge waveforms per ISO 7637-2 and IEC 61000-4-5 standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 28 V - Maximum continuous reverse working voltage before significant leakage begins; defines safe operating margin below breakdown. |
| Breakdown Voltage (VBR) | 31.1–34.3 V @ 1 mA - Confirmed voltage range where device transitions from high-impedance to low-impedance conduction; ensures predictable turn-on during transients. |
| Clamping Voltage (VCL) | ≤45.4 V @ 13.8 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; directly limits stress on downstream ICs. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs), 4 kW (8/20 µs) - Sustained energy-handling capability under standardized surge waveforms; validates ruggedness in automotive load-dump scenarios. |
| Leakage Current (IRM) | 0.2 µA @ 25 °C, 1 µA @ 85 °C - Ultra-low reverse leakage preserves efficiency in always-on circuits and minimizes standby power loss. |
| Junction Temperature Range | –55 °C to +175 °C - Enables deployment in under-hood automotive, industrial motor drives, and high-ambient environments without derating. |
| Dynamic Resistance (RD) | 0.363 Ω - Low incremental resistance improves clamping linearity and reduces voltage overshoot during high-di/dt events. |
Pinout & Package
The SMA6F28A is housed in an industry-standard SMA (DO-214AC) flat package with two terminals: Cathode (marked band) and Anode. The package complies with IPC7531 footprint guidelines and JEDEC MO-136AC outline, featuring matte tin-plated leads rated for 260 °C soldering (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR; polarity must match unidirectional configuration. |
| Anode | Reference node | Typically tied to system ground or low-impedance return path; completes conduction loop during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 Level 4 ESD immunity | Withstands ±25 kV contact and ±30 kV air discharge-meets stringent automotive and industrial ESD requirements without external shielding. |
| High-temperature reliability | Rated for continuous operation up to +175 °C junction temperature; supports placement near heat sources like power MOSFETs or transformers. |
| Low dynamic resistance | 0.363 Ω enables tighter clamping control and reduced overshoot during fast transients, improving protection margin for sensitive microcontrollers. |
| Planar silicon construction | Delivers consistent parametric performance and long-term stability versus older diffused-junction TVS devices, especially under thermal cycling. |
| UL94 V0 flammability rating | Ensures flame-retardant encapsulation meets safety standards for enclosed equipment and consumer electronics enclosures. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 24 V DC supply lines in engine control units (ECUs) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges exceeding 35 V while maintaining low leakage during normal operation. Use Value: Limits peak voltage to ≤45.4 V during 10/1000 µs transients, preventing damage to 36 V-rated CAN transceivers and MCU power domains. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers against field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across optocoupler input pins to shunt fast transients before they reach isolation barrier. Use Value: Clamps 8/20 µs surges to ≤59 V at 68 A, preserving input stage integrity without compromising response time of 24 V logic sensing. |
| Telecom Line Interface Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding RS-485 transceiver data lines in outdoor base stations from lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectionally configured pair (using two SMA6F28A back-to-back) to suppress differential-mode transients on twisted-pair cables. Use Value: Achieves <1 ns response time and <0.4 nF junction capacitance at 0 V bias, minimizing signal distortion on 10 Mbps communication links. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in smart home appliances (e.g., vacuum cleaners, power tools). IC Role / Device Role / Timing Role: Mounted across motor terminals to absorb flyback energy during PWM switching and commutation spikes. Use Value: Handles repetitive 600 W pulses at 175 °C ambient, extending motor driver lifespan and eliminating need for bulkier MOV-based solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A (onsemi) | Same SMA package, 28 V VRM, but lower PPP = 400 W (10/1000 µs); VCL = 45.7 V @ 13.7 A. | Limited to lower-energy surge environments; not recommended for ISO 7637-2 Pulse 5a load dump simulation. | Select when cost sensitivity outweighs peak power margin and thermal derating is acceptable. |
| SMCJ28A (Littelfuse) | Higher PPP = 1500 W (10/1000 µs), larger SMC (DO-214AB) package; VCL = 46.6 V @ 32.4 A. | Requires more PCB area and higher thermal mass; better suited for primary-level AC/DC front-end protection. | Choose when system-level surge testing demands >1 kW pulse handling and board space permits larger footprint. |
Compared with SMAJ28A and SMCJ28A, the SMA6F28A delivers optimal balance of high-temperature operation (+175 °C), ultra-low leakage, and 600 W surge capacity in the compact SMA outline-making it preferred for space-constrained, thermally aggressive embedded power nodes.
Availability
SMA6F28A is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom interface modules, and consumer appliance motor controls requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SMA6F28A 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with vertical manufacturing and broad IP portfolio.
The SMA6F Transil series targets high-reliability transient suppression in thermally demanding applications-designed specifically for automotive power distribution, industrial automation I/O protection, and mission-critical DC bus safeguarding.
FAQ
What is the maximum clamping voltage of SMA6F28A under a 10/1000 µs surge?
The maximum clamping voltage is 45.4 V at 13.8 A for a 10/1000 µs waveform, measured at Tj = 25 °C. This value increases with junction temperature due to its positive voltage temperature coefficient (9.8 × 10⁻⁴ /°C), reaching ~48.2 V at 125 °C using the formula VCL(Tj) = VCL(25 °C) × [1 + αT × (Tj − 25)].
Can SMA6F28A be used in bidirectional configurations?
No-SMA6F28A is strictly unidirectional. For bidirectional protection, two SMA6F28A devices must be connected in series opposition (anode-to-anode), or a dedicated bidirectional part like SMA6F28AY should be selected. Using a single unidirectional device in reverse-biased signal paths risks permanent breakdown.
Does SMA6F28A meet automotive qualification standards?
While not AEC-Q200 certified as a standalone component, SMA6F28A meets critical automotive-relevant specifications: IEC 61000-4-2 Level 4 ESD, operating Tj up to +175 °C, UL94 V0 flammability, and J-STD-020 MSL Level 1 moisture sensitivity-enabling use in non-safety-critical automotive subsystems when validated within full system-level testing.
What is the recommended PCB footprint for SMA6F28A?
The recommended footprint follows IPC7531 guidelines for SMA (DO-214AC) packages: pad length ≥2.5 mm, pad width ≥1.5 mm, solder mask opening matching copper, and ≥35 µm copper thickness on FR4. Thermal relief vias under pads improve heat dissipation during surge events and align with ST's thermal impedance curves for 1 cm² copper area per lead.
SMA6F28A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-221AC, SMA Flat Leads
- Series:
- SMA6F, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 13.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAflat
SMA6F28A FAQ
1.How can I place an order for SMA6F28A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F28A 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 reliable?
The price and inventory of SMA6F28A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6F28A is usually 5 days.
3.What payment methods are accepted for SMA6F28A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F28A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F28A?
SMA6F28A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F28A 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?
For technical support, including SMA6F28A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F28A requirements.
6.How does Aetrix verify that SMA6F28A is sourced from the original manufacturer or authorized distributors?
All SMA6F28A 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 meets industry standards.
7.What is the process for return or replacement of SMA6F28A?
All SMA6F28A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F28A, 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 part is unused and in its original packaging.
Return procedure for SMA6F28A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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