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STMicroelectronics SMA6F22A
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- Part No.:
- SMA6F22A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F22A.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:4,296
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Product details
Overview
SMA6F22A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode designed for robust ESD and surge protection in power rails and signal lines. It features a 22 V stand-off voltage (VRM), 24.4–27 V breakdown voltage (VBR), 35.5 V clamping voltage at 1 A (10/1000 µs), and operates up to 175 °C junction temperature-ideal for automotive power supply inputs and industrial I/O interfaces.
For engineers reviewing the SMA6F22A datasheet, SMA6F22A pinout, SMA6F22A application, or SMA6F22A equivalent, key selection criteria include clamping performance under 8/20 µs surges, low leakage (<1 µA at 85 °C), thermal stability at Tj = 175 °C, and compliance with IEC 61000-4-2 Level 4 (±25 kV contact / ±30 kV air discharge).
Technical Context
The SMA6F22A uses planar silicon avalanche technology to deliver precise voltage clamping during fast transients. Its unidirectional configuration enables DC-biased rail protection without reverse conduction, while its low dynamic resistance (0.48 Ω at 10/1000 µs) ensures minimal voltage overshoot under high peak currents.
Designed for high-reliability environments, it maintains stable VBR and VCL across –55 °C to +175 °C operating range, with temperature coefficients (αT = 9.6 × 10⁻⁴ /°C) enabling accurate clamping prediction at elevated junction temperatures-critical for under-hood automotive modules and industrial motor drives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 22 V - Maximum continuous reverse working voltage before significant leakage begins; defines safe operating margin below breakdown. |
| Breakdown Voltage (VBR) | 24.4–27 V at 1 mA - Confirmed avalanche onset range; ensures predictable triggering during overvoltage events. |
| Clamping Voltage (VCL) | 35.5 V at 1 A (10/1000 µs) - Peak voltage seen by protected circuit during standardized surge; limits stress on downstream ICs. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs), 4 kW (8/20 µs) - Sustains high-energy transients without failure; supports IEC 61000-4-5 compliance testing. |
| Leakage Current (IRM) | 0.2 µA at 25 °C, 1 µA at 85 °C - Ultra-low off-state current minimizes power loss and avoids false triggering in battery-powered systems. |
| Junction Temperature Range | –55 °C to +175 °C - Enables deployment in engine control units, power converters, and other thermally demanding locations. |
Pinout & Package
Supplied in the industry-standard SMA (DO-214AC) flat package with matte tin-plated leads. Dimensions conform to JEDEC registered outline: D = 2.25–2.90 mm, E = 5.00–5.35 mm, E1 = 3.95–4.60 mm, and L = 0.75–1.20 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference/ground return | Tied to system ground or low-impedance return path; completes clamping loop with minimal inductance. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 Level 4 ESD immunity | Withstands ±25 kV contact and ±30 kV air discharge-exceeds automotive and industrial immunity requirements. |
| High-temperature reliability | Rated for continuous operation at Tj = 175 °C; maintains clamping integrity in under-hood and power-converter applications. |
| Low dynamic resistance | 0.48 Ω (10/1000 µs) - Reduces voltage overshoot during fast-rising transients, improving protection margin for sensitive logic. |
| Planar construction | Enables tight parameter distribution and long-term stability-critical for high-volume automotive production. |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O |
|---|---|
Use Scenario: 12 V battery rail in engine control unit exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary TVS clamp absorbing >400 W surges within microseconds to prevent MCU reset or regulator latch-up. Use Value: Clamps to ≤35.5 V at 1 A, keeping downstream 3.3 V/5 V regulators within safe input range during 10/1000 µs transients. | Use Scenario: 24 V digital input channel on programmable logic controller subject to field-wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional surge suppressor placed between terminal block and optocoupler input stage. Use Value: 1 µA max leakage at 85 °C prevents false triggering of high-impedance sensing circuits during extended thermal operation. |
| DC-DC Converter Output Rail | Smart Meter Communication Port |
Use Scenario: Secondary-side 5 V output of isolated flyback converter powering microcontroller and sensors. IC Role / Device Role / Timing Role: Secondary-side TVS protecting against cross-conduction surges and transformer-coupled transients. Use Value: 0.48 Ω dynamic resistance ensures rapid clamping response (<1 ns rise time), limiting overshoot to <1.5 V above nominal. | Use Scenario: RS-485 interface on utility smart meter installed in electrically noisy substations. IC Role / Device Role / Timing Role: Line-side TVS on differential pair, coordinated with common-mode choke and receiver ESD diodes. Use Value: 35.5 V clamping at 1 A allows full compliance with IEC 61000-4-5 (4 kV surge) while preserving receiver common-mode range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Same SMA package, but rated for 400 W (10/1000 µs); higher VCL (38.9 V @ 1 A) and lower PPP. | Lower power handling makes it suitable only for lighter-duty consumer electronics-not automotive or industrial surge zones. | Select SMAJ22A only when peak surge energy is <400 W and board space constraints prohibit larger packages. |
| SMCJ22A | Same VRM/VBR specs but in larger SMC (DO-214AB) package; rated for 1500 W (10/1000 µs) and 10 kW (8/20 µs). | Higher thermal mass and power rating support repeated surge events in motor drive gate drivers and solar inverter DC links. | Choose SMCJ22A where sustained surge repetition or >600 W single-event immunity is required-accepting larger footprint and higher cost. |
Compared with SMAJ22A and SMCJ22A, the SMA6F22A uniquely balances 600 W surge capability, ultra-low leakage, and compact SMA footprint-making it optimal for space-constrained, high-temperature automotive and industrial control nodes where both reliability and size matter.
Availability
SMA6F22A is available at Aetrix Electronics and suitable for automotive power inputs, industrial PLC I/O modules, DC-DC converter outputs, and smart meter communication ports requiring stable component supply across multi-year production cycles.
Supply support for SMA6F22A 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 discrete solutions with strong vertical integration and AEC-Q101 qualification capabilities.
The SMA6F series belongs to ST's Transil™ TVS portfolio, engineered specifically for high-reliability transient suppression in harsh-environment applications-emphasizing thermal robustness, low leakage, and IEC/ISO-compliant surge performance.
FAQ
What is the maximum clamping voltage of SMA6F22A under an 8/20 µs surge?
The SMA6F22A clamps to 48.3 V at 83 A under an 8/20 µs waveform, per Table 2 in DS12564 Rev 3. This value reflects worst-case VCL at rated peak current and is critical for verifying downstream component voltage margins during lightning-induced surges.
Does SMA6F22A support reflow soldering per J-STD-020?
Yes-ST specifies a JEDEC-compliant reflow profile with peak temperature of 240–245 °C for 2–3 seconds, matching J-STD-020 MSL Level 1 requirements. The device's matte tin plating and thermal design ensure reliable attachment without delamination or parametric shift.
How does temperature affect the breakdown voltage of SMA6F22A?
VBR increases linearly with junction temperature at αT = 9.6 × 10⁻⁴ /°C. At 150 °C, VBR rises ~11.5% above its 25 °C value-e.g., from 24.4 V min to ~27.2 V min-ensuring consistent triggering even under thermal stress.
Is SMA6F22A RoHS and REACH compliant?
Yes-ST certifies SMA6F22A as ECOPACK®2-compliant, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Full material declarations and substance reports are available via ST's product change notifications and quality portal.
SMA6F22A 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 17.7A
- 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
SMA6F22A FAQ
1.How can I place an order for SMA6F22A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F22A 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 SMA6F22A reliable?
The price and inventory of SMA6F22A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6F22A is usually 5 days.
3.What payment methods are accepted for SMA6F22A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F22A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F22A?
SMA6F22A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F22A 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 SMA6F22A?
For technical support, including SMA6F22A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F22A requirements.
6.How does Aetrix verify that SMA6F22A is sourced from the original manufacturer or authorized distributors?
All SMA6F22A 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 SMA6F22A meets industry standards.
7.What is the process for return or replacement of SMA6F22A?
All SMA6F22A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F22A, 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 SMA6F22A part is unused and in its original packaging.
Return procedure for SMA6F22A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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