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STMicroelectronics SMA6F11A
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- Part No.:
- SMA6F11A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F11A.pdf
- Description:
- TVS DIODE 11VWM 18VC SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:2,748
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Product details
Overview
SMA6F11A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode designed for primary-level surge protection in DC power rails and signal lines. It features a 11 V stand-off voltage (VRM), 13.7 V maximum clamping voltage at 18 A (10/1000 µs), and 24.2 V clamping at 165 A (8/20 µs), operating up to 175 °C junction temperature. It is used in industrial power supplies, automotive body control modules, and PoE-powered Ethernet interfaces.
For engineers reviewing the SMA6F11A datasheet, SMA6F11A pinout, SMA6F11A application, or SMA6F11A equivalent, key selection criteria include clamping performance under IEC 61000-4-2 Level 4 (±25 kV contact / ±30 kV air), low leakage (<1 µA at 85 °C), dynamic resistance (0.064 Ω), and compatibility with FR4 PCBs using JEDEC-standard SMA footprint.
Technical Context
The SMA6F11A employs planar silicon avalanche technology to deliver precise breakdown at 12.3–13.7 V (VBR min–max @ 1 mA), with temperature coefficient αT = 8.1 × 10⁻⁴ /°C. Its low dynamic resistance (0.064 Ω) ensures minimal voltage overshoot during fast transients.
It meets IEC 61000-4-2 ESD immunity beyond Level 4 and supports high-reliability operation across –55 °C to +175 °C junction range, validated per J-STD-020 MSL Level 1 and JESD 22-B102 E3 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 11 V - Maximum continuous reverse working voltage before conduction begins. |
| Breakdown Voltage (VBR) | 12.3–13.7 V @ 1 mA - Tight tolerance ensures predictable turn-on during surges. |
| Clamping Voltage (VCL) | 18 V @ 18 A (10/1000 µs); 24.2 V @ 165 A (8/20 µs) - Limits downstream voltage stress during lightning or EFT events. |
| Peak Pulse Power | 600 W (10/1000 µs); 4 kW (8/20 µs) - Handles high-energy transients common in industrial and automotive environments. |
| Leakage Current | 0.2 µA @ 25 °C; 1 µA @ 85 °C - Enables low-power standby circuits without battery drain. |
| Junction Temperature Range | –55 °C to +175 °C - Supports under-hood automotive and high-ambient industrial deployments. |
| Dynamic Resistance (RD) | 0.064 Ω - Low impedance maintains tight clamping under high di/dt conditions. |
Pinout & Package
The SMA6F11A uses the industry-standard SMA (DO-214AC) flat package: 2.25–2.90 mm length, 5.00–5.35 mm width, 0.90–1.10 mm height, matte tin-plated leads, and JEDEC-compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge current sink | Connected to protected line; conducts transient energy to ground when VRM exceeded. |
| Anode | Reference/ground return | Typically tied to system ground or low-impedance return path for effective clamping. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 Level 4 compliance | Withstands ±25 kV contact and ±30 kV air discharge without degradation. |
| High-temperature reliability | Rated for continuous operation up to 175 °C junction temperature with stable VBR and IR. |
| Low dynamic resistance | 0.064 Ω minimizes clamping voltage rise under high peak currents (e.g., 165 A). |
| Planar junction construction | Enables tight parameter distribution, low leakage, and robust thermal cycling performance. |
| MSL Level 1 moisture sensitivity | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input rail in programmable logic controllers exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Primary TVS clamp placed upstream of DC-DC converter input to limit surge voltage to <25 V. Use Value: Prevents damage to downstream regulators and microcontrollers during ISO 7637-2 Pulse 5a (load dump) events. | Use Scenario: LIN bus interface and sensor supply lines in door module ECUs subject to ESD and cable discharge. IC Role / Device Role / Timing Role: Unidirectional TVS on 12 V supply and LIN signal line to suppress ESD and slow transients. Use Value: Maintains signal integrity and prevents latch-up in LIN transceivers during ±25 kV contact ESD per ISO 10605. |
| PoE-Powered Ethernet Interface | Smart Meter Power Supply |
Use Scenario: 48 V DC input stage of IEEE 802.3af/at powered device (PD) circuitry. IC Role / Device Role / Timing Role: Standoff-rated TVS on PSE-side power pair to absorb induced surges from nearby AC wiring. Use Value: Clamps transients to <30 V within 1 ns, protecting PoE interface ICs and isolation barriers. | Use Scenario: Mains-derived 5 V auxiliary supply in utility smart meters installed in outdoor enclosures. IC Role / Device Role / Timing Role: Secondary-level TVS after fuse and MOV, providing precise clamping for MCU and RTC backup rails. Use Value: Ensures <1 µA leakage at 85 °C ambient, preserving battery life in long-term meter deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A | Same SMA package, but 400 W (10/1000 µs) rating and higher VCL (19.9 V @ 18 A). | Lower power handling limits use in high-energy surge environments like industrial motor drives. | Select when cost sensitivity outweighs need for 600 W surge margin. |
| 1.5SMC11A | Higher power (1500 W), larger SMC (DO-214AB) package, 20.1 V VCL @ 75 A (10/1000 µs). | Requires more PCB area and has slower response due to higher junction capacitance (~100 pF vs. ~30 pF). | Choose for legacy designs already using SMC footprints or where >1 kW pulse capability is mandatory. |
Compared with SMAJ11A and 1.5SMC11A, SMA6F11A delivers superior 600 W surge rating in the compact SMA footprint while maintaining lower clamping voltage and leakage-making it optimal for space-constrained, high-reliability 12 V systems requiring IEC 61000-4-2 Level 4 compliance.
Availability
SMA6F11A is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, and PoE-powered Ethernet interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMA6F11A 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 power management, analog, MEMS, and automotive-grade ICs.
The SMA6FxxA series belongs to ST's Transil™ TVS portfolio, engineered specifically for high-reliability transient suppression in harsh-environment applications where low leakage, high Tj, and repeatable clamping are critical.
FAQ
What is the maximum clamping voltage of SMA6F11A under an 8/20 µs surge?
The SMA6F11A clamps to 24.2 V at 165 A under an 8/20 µs waveform, as specified in Table 2 of DS12564 Rev 3. This value reflects worst-case VCL at rated peak current and ensures downstream components see no more than 24.2 V during high-energy transients such as lightning-induced surges.
Does SMA6F11A meet automotive qualification standards?
SMA6F11A is not AEC-Q200 qualified, but its –55 °C to +175 °C operating junction range, IEC 61000-4-2 Level 4 ESD rating, and JESD22-A108 temperature cycling validation make it suitable for non-safety-critical automotive applications like body electronics and infotainment power rails when used with appropriate system-level validation.
Can SMA6F11A be used in bidirectional configurations?
No - SMA6F11A is unidirectional only, with cathode marking indicating polarity-sensitive placement. For bidirectional protection, ST offers the SMA6F11CA variant (center-tapped, symmetrical clamping), which must be selected explicitly; mixing unidirectional and bidirectional types risks improper surge diversion.
What is the recommended PCB footprint for SMA6F11A?
The recommended footprint follows JEDEC DO-214AC (SMA) standards: pad length ≥3.9 mm, pad width ≥1.2 mm, center-to-center pitch 4.0 mm, and copper area ≥1 cm² per lead to maintain thermal resistance ≤50 °C/W (per Figure 11). Use FR4 with 35 µm Cu thickness and avoid thermal relief on high-current paths.
SMA6F11A 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):
- 11V
- Voltage - Breakdown (Min):
- 12.3V
- Voltage - Clamping (Max) @ Ipp:
- 18V
- Current - Peak Pulse (10/1000µs):
- 33.8A
- 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
SMA6F11A FAQ
1.How can I place an order for SMA6F11A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F11A 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 SMA6F11A reliable?
The price and inventory of SMA6F11A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6F11A is usually 5 days.
3.What payment methods are accepted for SMA6F11A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F11A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F11A?
SMA6F11A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F11A 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 SMA6F11A?
For technical support, including SMA6F11A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F11A requirements.
6.How does Aetrix verify that SMA6F11A is sourced from the original manufacturer or authorized distributors?
All SMA6F11A 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 SMA6F11A meets industry standards.
7.What is the process for return or replacement of SMA6F11A?
All SMA6F11A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F11A, 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 SMA6F11A part is unused and in its original packaging.
Return procedure for SMA6F11A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6F11A Tags
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