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STMicroelectronics SMA6F15AY
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- Part No.:
- SMA6F15AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F15AY.pdf
- Description:
- TVS DIODE 15VWM 24.4VC SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:4,222
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Product details
Overview
SMA6F15AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMA Flat package, designed to clamp transient overvoltages up to 24.4 V (10/1000 µs) at 25.1 A peak pulse current while maintaining low leakage (0.2 µA @ 25 °C) and operating up to 175 °C junction temperature. It delivers 600 W peak pulse power (10/1000 µs) and exceeds ISO 10605 ESD immunity (±30 kV contact/air) for robust protection of 12 V automotive power rails.
For engineers reviewing the SMA6F15AY datasheet, SMA6F15AY pinout, SMA6F15AY application, or SMA6F15AY equivalent, this device is selected for high-reliability surge suppression in battery-supplied ECUs, body control modules, and infotainment power inputs where stand-off voltage (VRM = 15 V), clamping performance (VCL = 24.4 V), thermal stability (Tj max = 175 °C), and AEC-Q101 qualification are mandatory.
Technical Context
This TVS diode uses planar silicon technology to achieve low dynamic resistance (RD = 0.235 Ω) and stable clamping across temperature (αT = 8.8 × 10⁻⁴ /°C), enabling predictable overvoltage protection during ISO 7637-2 pulses (Pulse 1: −150 V; Pulse 2a: +112 V; Pulse 3a/b: ±220 V / ±150 V). Its unidirectional configuration supports DC-biased lines with reverse stand-off voltage precisely rated at 15 V.
The SMA Flat package (1.0 mm height, JEDEC-compliant outline) ensures compatibility with automated SMT assembly and high thermal dissipation via copper pad layout-Rth(j-a) drops to ~4.5 °C/W with 5 cm² copper per lead. It meets IEC 61000-4-4 Level 4 (±4 kV) and exceeds ISO 10605 test conditions under both 150 pF/330 Ω and 330 pF/330 Ω models.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 15 V - Maximum continuous reverse operating voltage before breakdown; matches 12 V automotive system nominal with margin. |
| Breakdown Voltage (VBR min) | 16.7 V - Guaranteed minimum reverse breakdown at 1 mA; ensures reliable triggering above normal rail fluctuations. |
| Clamping Voltage (VCL) | 24.4 V @ 25.1 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; limits stress on downstream ICs. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustained energy-handling capability at ambient; derates to 400 W at Tj = 175 °C per Figure 3. |
| Leakage Current (IRM) | 0.2 µA @ 25 °C - Ultra-low reverse leakage preserves battery life in always-on automotive modules. |
| Junction Temperature Range | −55 °C to +175 °C - Enables operation in engine bay and under-hood environments without thermal shutdown. |
| ESD Withstand (ISO 10605) | ±30 kV (contact & air, C = 150/330 pF, R = 330 Ω) - Exceeds automotive ESD immunity requirements for direct human interaction points. |
Pinout & Package
The SMA6F15AY is housed in a surface-mount SMA Flat package (JEDEC DO-214AC), measuring 2.90 mm × 5.35 mm × 1.10 mm (L × W × H), with matte tin-plated leads and MSL Level 1 moisture sensitivity rating. The flat profile (1.0 mm max height) enables low-profile PCB layouts and improved airflow in dense automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge current sink terminal | Connected to protected line (e.g., battery rail); conducts transient current to ground during overvoltage events. |
| Anode | Reference/ground return | Typically tied to chassis or system ground; completes clamping path with minimal inductance for fast response. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock per JESD22 standards. |
| Low dynamic resistance (RD) | 0.235 Ω - Minimizes clamping voltage rise under high-current transients, improving protection margin for sensitive loads. |
| High-temperature operation | Rated up to 175 °C junction temperature - Supports placement near heat sources (e.g., power converters, motor drivers) without derating. |
| Flat, thin SMA package | 1.0 mm max height - Enables compact placement in space-constrained modules and reduces board-level mechanical stress during thermal cycling. |
| ISO 7637-2 compliance | Withstands Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), Pulse 3b (+150 V) - Covers all major automotive load-dump and inductive-switching threats. |
Applications
| Body Control Module (BCM) Power Input | Infotainment System DC-DC Input |
|---|---|
Use Scenario: Protects BCM microcontroller and CAN transceivers from battery line transients during jump-starts, alternator load dumps, and relay switching. IC Role / Device Role / Timing Role: Unidirectional TVS clamps reverse-polarity and overvoltage surges on the 12 V supply rail before they reach LDOs and logic ICs. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V regulators and MCU I/Os by limiting rail voltage to ≤24.4 V during 10/1000 µs pulses. |
Use Scenario: Shields infotainment head unit power entry from ESD events (e.g., user USB port insertion) and conducted noise from vehicle harnesses. IC Role / Device Role / Timing Role: Acts as first-line transient suppressor on 12 V input to buck converter, absorbing ±30 kV ESD strikes and ISO 10605 pulses. Use Value: Eliminates need for secondary filtering stages by meeting full ISO 10605 immunity without degrading signal integrity or efficiency. |
| ADAS Camera Power Rail | Electric Power Steering (EPS) Sensor Interface |
Use Scenario: Secures 12 V camera module supply against ignition-induced spikes and long-duration load-dump events in front-end ADAS systems. IC Role / Device Role / Timing Role: Clamps ISO 7637-2 Pulse 1 (−150 V) and Pulse 3b (+150 V) on camera power line, ensuring uninterrupted image capture. Use Value: Maintains <1 µs response time and <25 V clamping to prevent video corruption or sensor reset during harsh electrical environments. |
Use Scenario: Guards Hall-effect or resolver sensor supply lines in EPS against coupled transients from motor commutation and PWM switching. IC Role / Device Role / Timing Role: Provides low-leakage (0.2 µA) standoff at 15 V while clamping fast-rising 8/20 µs surges to ≤32.5 V at 123 A. Use Value: Preserves analog sensor accuracy by avoiding DC offset drift from leakage current and minimizing voltage overshoot during motor phase transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6F15A | Same VRM (15 V), but non-automotive grade (no AEC-Q101); lower ESD rating (IEC 61000-4-2 only, not ISO 10605). | Limited to industrial or consumer-grade 12 V systems without automotive qualification requirements. | Select when cost sensitivity outweighs AEC-Q101 compliance and ESD test depth. |
| SMCJ15A | Higher PPP (1500 W), larger SMC package (2.5 mm height), same VRM (15 V), but higher VCL (24.4 V → 25.5 V) and RD (0.26 Ω). | Better suited for high-energy transients where board space allows larger footprint and thermal mass. | Choose when surge energy exceeds 600 W and PCB layout permits SMC package dimensions. |
Compared with SMA6F15A and SMCJ15A, the SMA6F15AY uniquely balances AEC-Q101 qualification, ultra-thin profile (1.0 mm), and verified ISO 10605 ±30 kV performance-making it optimal for space-constrained, safety-critical automotive modules where qualification and form factor are non-negotiable.
Availability
SMA6F15AY is available at Aetrix Electronics and suitable for body control modules, ADAS camera power supplies, infotainment DC-DC inputs, and electric power steering sensor interfaces requiring stable component supply across automotive production lifecycles.
Supply support for SMA6F15AY 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 SMA6FY Transil series targets automotive electronics protection, engineered specifically for ISO 7637-2 and ISO 10605 compliance in harsh vehicular environments-prioritizing reliability, thermal resilience, and AEC-Q101 validation over generic surge suppression.
FAQ
What is the maximum clamping voltage of SMA6F15AY under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 24.4 V at 25.1 A peak pulse current for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature per the αT coefficient (8.8 × 10⁻⁴ /°C), reaching approximately 26.2 V at Tj = 175 °C using the formula VCL(Tj) = VCL(25 °C) × [1 + αT × (Tj − 25)].
Can SMA6F15AY be used in bidirectional protection circuits?
No-SMA6F15AY is strictly unidirectional and must be installed with cathode toward the protected line. For bidirectional protection (e.g., data lines or AC-coupled signals), ST offers the SMA6F15AY's counterpart SMA6F15CA, which features symmetrical breakdown in both polarities and different marking (6BCA instead of 6BCY).
How does the SMA Flat package affect thermal performance compared to standard SMA?
The SMA Flat package reduces height to 1.10 mm (vs. ~2.3 mm for standard SMA), improving airflow and reducing mechanical stress, while maintaining identical thermal interface properties. Its Rth(j-a) is 4.5 °C/W with 5 cm² copper per lead-comparable to standard SMA-but achieves better board-level reliability in vibration-prone automotive applications due to lower center-of-gravity and enhanced solder joint integrity.
Is lead-free reflow compatible with SMA6F15AY's specifications?
Yes-the device is RoHS-compliant and qualified for lead-free reflow per JEDEC J-STD-020 MSL Level 1, with peak reflow temperature of 240–245 °C for ≤30 seconds. The matte tin plating ensures reliable wetting, and the recommended profile (Figure 24) limits ramp rates to ≤3 °C/s and dwell time to 60–90 seconds within the liquidus range to prevent delamination or voiding.
SMA6F15AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-221AC, SMA Flat Leads
- Series:
- SMA6F
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAflat
SMA6F15AY FAQ
1.How can I place an order for SMA6F15AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F15AY 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 SMA6F15AY reliable?
The price and inventory of SMA6F15AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6F15AY is usually 5 days.
3.What payment methods are accepted for SMA6F15AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F15AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F15AY?
SMA6F15AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F15AY 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 SMA6F15AY?
For technical support, including SMA6F15AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F15AY requirements.
6.How does Aetrix verify that SMA6F15AY is sourced from the original manufacturer or authorized distributors?
All SMA6F15AY 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 SMA6F15AY meets industry standards.
7.What is the process for return or replacement of SMA6F15AY?
All SMA6F15AY units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F15AY, 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 SMA6F15AY part is unused and in its original packaging.
Return procedure for SMA6F15AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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