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STMicroelectronics SMA6F15A
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- Part No.:
- SMA6F15A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F15A.pdf
- Description:
- TVS DIODE 15VWM 24.4VC SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:3,342
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Product details
Overview
SMA6F15A 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 15 V stand-off voltage (VRM), 16.7–18.5 V breakdown voltage (VBR) at 1 mA, clamps to ≤24.4 V at 25.1 A (10/1000 µs), and operates up to 175 °C junction temperature - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMA6F15A datasheet, SMA6F15A pinout, SMA6F15A application, or SMA6F15A equivalent, key selection criteria include clamping voltage under 25 A surge, low leakage (<1 µA at 85 °C), high-temperature reliability, and IEC 61000-4-2 Level 4 ESD immunity (±25 kV contact / ±30 kV air).
Technical Context
The SMA6F15A uses planar silicon avalanche technology to deliver precise, repeatable clamping with low dynamic resistance (0.235 Ω at 25 °C). Its unidirectional configuration enables integration into polarity-sensitive DC paths without reverse-bias conduction during normal operation.
Thermal performance is optimized for sustained reliability: maximum junction temperature reaches 175 °C, and peak pulse power remains at 400 W even at Tj = 175 °C (10/1000 µs), supported by low thermal impedance on standard FR4 PCB footprints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 15 V - Maximum continuous reverse operating voltage before leakage exceeds 0.2 µA at 25 °C |
| Breakdown Voltage (VBR) | 16.7–18.5 V at 1 mA - Ensures reliable triggering above nominal rail voltage with margin against tolerance drift |
| Clamping Voltage (VCL) | ≤24.4 V at 25.1 A (10/1000 µs) - Limits downstream IC stress during 600 W surge events |
| Peak Pulse Power | 600 W (10/1000 µs), 4 kW (8/20 µs) - Supports both lightning-induced long-tail and ESD-fast-rising transients |
| Leakage Current | 0.2 µA at 25 °C, 1 µA at 85 °C - Minimizes standby power loss in battery-backed systems |
| Junction Temperature Range | −55 to +175 °C - Enables deployment in under-hood automotive and industrial motor drive environments |
| ESD Rating | ±25 kV contact / ±30 kV air (IEC 61000-4-2 Level 4) - Exceeds automotive and industrial immunity requirements |
Pinout & Package
The SMA6F15A is housed in an industry-standard SMA (DO-214AC) flat package with matte tin-plated leads, compliant with IPC7531 footprint and JEDEC MO-136AA outline. Dimensions: 4.5 mm × 2.7 mm × 2.2 mm (L × W × H), weight 39 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping ratio (VCL/VBR ≈ 1.46) | Enables tighter protection margins for 15 V logic and microcontroller I/O rails |
| High-temperature power derating | Maintains 400 W surge capability at 175 °C junction - critical for enclosed power converters |
| Planar junction construction | Delivers stable VBR and low leakage across temperature, improving long-term field reliability |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow without baking - simplifies SMT manufacturing |
| UL94 V0 flammability rating | Meets safety standards for enclosures in industrial and transportation equipment |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input channels in programmable logic controllers exposed to inductive switching transients from solenoids and relays. IC Role / Device Role / Timing Role: Primary TVS clamp placed directly at connector entry point to shunt >1 kV surges before reaching isolation amplifiers or MCU GPIO. Use Value: Clamps 25 A surge to ≤24.4 V within nanoseconds, preventing latch-up or gate oxide damage in downstream analog front-end ICs. | Use Scenario: LIN bus and sensor supply lines in door module ECUs subject to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Unidirectional TVS on 12 V rail and LIN signal line to suppress coupled transients while preserving signal integrity. Use Value: Withstands 175 °C ambient and maintains <1 µA leakage at 85 °C junction, ensuring low-power sleep mode compliance. |
| Telecom Power Supply Input | Smart Meter DC Power Rail |
Use Scenario: 48 V DC input stage of PoE-powered network switches subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-line TVS in series with fuse and common-mode choke to absorb 4 kW (8/20 µs) fast-rising energy. Use Value: 4 kW peak pulse rating enables robust protection without cascaded stages, reducing BOM count and board space. | Use Scenario: 3.3 V or 5 V internal power rail in utility smart meters installed in outdoor meter cabinets. IC Role / Device Role / Timing Role: Secondary TVS after primary MOV/LN surge stage to protect low-voltage MCU and RF transceiver ICs. Use Value: Low 0.2 µA leakage at 25 °C minimizes battery drain in backup-supplied metrology circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A | Same SMA package, but lower 400 W peak power (10/1000 µs); higher VCL (24.4 V vs. 24.4 V identical at 25.1 A) | Limited to lower-energy surge environments; not rated for 4 kW (8/20 µs) | Select when cost sensitivity outweighs need for full IEC 61000-4-5 Level 3 compliance |
| 1.5SMC15A | Higher 1500 W peak power (10/1000 µs), but larger SMC (DO-214AB) package; 20% larger footprint | Requires PCB redesign; better suited for high-reliability telecom base stations | Choose when surge energy exceeds 600 W and board space permits larger package |
Compared with SMAJ15A and 1.5SMC15A, the SMA6F15A uniquely balances 600 W/4 kW surge handling, SMA footprint compatibility, and 175 °C operation - making it optimal for space-constrained, high-temperature industrial and automotive edge nodes where both size and thermal resilience are critical.
Availability
SMA6F15A is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, telecom power supply inputs, and smart meter DC power rails requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SMA6F15A 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 vertical manufacturing and broad IP portfolio.
The SMA6F Transil series targets high-reliability transient suppression in harsh-environment applications - engineered for low leakage, high-temperature stability, and compliance with IEC 61000-4-2/4-5 and AEC-Q101 requirements.
FAQ
What is the maximum clamping voltage of SMA6F15A under a 10/1000 µs surge?
The SMA6F15A clamps to a maximum of 24.4 V at 25.1 A under a 10/1000 µs waveform, per Table 2 in DS12564 Rev 3. This value is measured at 25 °C ambient and represents the upper limit of voltage seen by downstream circuitry during a standardized surge event.
Can SMA6F15A be used in bidirectional signal line protection?
No - SMA6F15A is strictly unidirectional and must be oriented with cathode toward the protected line. For bidirectional protection (e.g., RS-485, USB D+/D−), use the SMA6F15CA variant or a dedicated bidirectional TVS array; reverse bias beyond VRM will cause leakage escalation without controlled clamping.
Does SMA6F15A meet AEC-Q101 qualification for automotive use?
Yes - the SMA6F15A is AEC-Q101 qualified per ST's product status documentation and supports automotive applications including body control modules and LIN bus protection. Its 175 °C max junction temperature and IEC 61000-4-2 Level 4 ESD rating align with AEC-Q101 stress test requirements.
What is the recommended PCB footprint for SMA6F15A?
The recommended footprint follows IPC7531 and JEDEC MO-136AA standards: pad length 2.0 mm, pad width 1.5 mm, center-to-center pitch 4.0 mm, with 0.5 mm solder mask opening clearance. Figure 13 in DS12564 Rev 3 provides exact dimensions in mm and inches for FR4 boards with 35 µm copper.
SMA6F15A 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 25.1A
- 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
SMA6F15A FAQ
1.How can I place an order for SMA6F15A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F15A 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 SMA6F15A reliable?
The price and inventory of SMA6F15A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6F15A is usually 5 days.
3.What payment methods are accepted for SMA6F15A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F15A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F15A?
SMA6F15A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F15A 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 SMA6F15A?
For technical support, including SMA6F15A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F15A requirements.
6.How does Aetrix verify that SMA6F15A is sourced from the original manufacturer or authorized distributors?
All SMA6F15A 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 SMA6F15A meets industry standards.
7.What is the process for return or replacement of SMA6F15A?
All SMA6F15A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F15A, 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 SMA6F15A part is unused and in its original packaging.
Return procedure for SMA6F15A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6F15A Tags
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