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STMicroelectronics SM6F6.5AY
- Part No.:
- SM6F6.5AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- SOD-128
- Datasheet:
-
SM6F6.5AY.pdf
- Description:
- TVS DIODE 6.5VWM 14.5V SOD128FLT
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
SM6F6.5AY from STMicroelectronics is an AEC-Q101-qualified unidirectional 600 W transient voltage suppressor (TVS) diode in SOD128 Flat package, designed for automotive circuit protection against ISO 7637-2 pulses and IEC/ISO ESD events. It features a 6.5 V stand-off voltage (VRM), 7.2–8.0 V breakdown range (VBR), 11.2 V clamping voltage at 56 A (VCL), and operates up to 175 °C junction temperature.
For engineers reviewing the SM6F6.5AY datasheet, SM6F6.5AY pinout, SM6F6.5AY application, or SM6F6.5AY equivalent, this device is selected for high-reliability 12 V automotive power line surge suppression where low leakage (≤50 µA at 25 °C), tight VBR tolerance, and robust 8/20 µs pulse handling (276 A) are critical.
Technical Context
The SM6F6.5AY employs planar silicon technology to achieve stable dynamic resistance (0.057 Ω at 10/1000 µs) and low leakage current across its full operating temperature range (−55 °C to +175 °C). Its unidirectional configuration enables asymmetric clamping with forward conduction capability during negative transients.
It meets stringent automotive immunity standards including ISO 10605 (±30 kV contact/air discharge), IEC 61000-4-4 Level 4 (4 kV), and ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V), making it suitable for battery-line and load-dump-protected circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 6.5 V - Maximum continuous reverse operating voltage before significant leakage begins; sets threshold for 12 V automotive system compatibility. |
| Breakdown Voltage (VBR) | 7.2–8.0 V at 10 mA - Confirmed voltage range where device transitions from high-impedance to low-impedance clamping; ensures reliable turn-on under surge conditions. |
| Clamping Voltage (VCL) | 11.2 V at 56 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; limits downstream IC stress to safe levels. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustained energy-handling capability at 25 °C ambient; derates to 240 W at 175 °C junction temperature. |
| Leakage Current (IRM) | ≤20 µA at 6.5 V, 25 °C - Minimal standby power loss and signal integrity impact in always-on automotive modules. |
| Dynamic Resistance (RD) | 0.057 Ω - Low impedance during clamping ensures minimal voltage overshoot and efficient energy diversion away from sensitive loads. |
| Junction Temperature Range | −55 °C to +175 °C - Enables operation in engine bay, transmission control, and other high-thermal-stress automotive locations without derating. |
Pinout & Package
SOD128 Flat package: surface-mount, two-terminal, lead-free matte tin-plated, JEDEC-registered outline (4.6–4.8 mm × 2.3–2.5 mm × 0.93–1.03 mm height), IPC7531-compliant footprint, MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward current entry / Surge return path | Connected to ground or low-side reference; conducts during negative transients (e.g., ISO 7637-2 Pulse 1, 3a). |
| Cathode (K) | Reverse-biased terminal / Clamping node | Connected to protected line (e.g., battery rail); blocks normal operation but clamps positive surges (e.g., Pulse 2a, 3b) to ≤11.2 V. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability across temperature cycling, humidity, mechanical shock, and lifetime HTOL testing per JESD22-A108. |
| High-temperature power capability | Maintains 240 W peak pulse power at Tj = 175 °C - enables use in under-hood applications without thermal derating penalties. |
| Low dynamic resistance | 0.057 Ω at 10/1000 µs - minimizes clamping voltage rise under high-current transients, improving protection margin for 5 V/3.3 V logic interfaces. |
| ESD robustness | Exceeds ISO 10605 ±30 kV (contact/air) and IEC 61000-4-2 ±30 kV - eliminates need for additional ESD protection on CAN/LIN lines or sensor inputs. |
| Planar silicon construction | Ensures stable leakage (<50 µA at 85 °C) and predictable VBR drift (αT = 6.1 × 10⁻⁴ /°C) over lifetime - critical for long-term field reliability. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) LIN Bus Protection |
|---|---|
Use Scenario: Protects 12 V supply rail of engine ECU against load dump (ISO 7637-2 Pulse 3b) and alternator-induced spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor; clamps transients within 1 ns response time. Use Value: Limits voltage excursion to ≤11.2 V, preventing damage to 16-bit MCU power rails and analog front-end regulators. |
Use Scenario: Shields LIN transceiver PHY from ESD events during vehicle assembly and service operations. IC Role / Device Role / Timing Role: TVS connected between LIN bus line and chassis ground; absorbs ±30 kV contact discharge per ISO 10605. Use Value: Maintains LIN signal integrity below 20 kbps while surviving repeated ESD strikes without parameter shift or failure. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Guards 12 V input to image sensor module exposed to ignition noise and jump-start transients. IC Role / Device Role / Timing Role: Primary surge clamp on camera module's DC-DC input stage; handles ISO 7637-2 Pulse 2a (+112 V) and Pulse 1 (−150 V). Use Value: Prevents latch-up or pixel corruption in CMOS image sensors by holding rail voltage within 11.2 V clamping limit during 100 ms surges. |
Use Scenario: Protects H-bridge gate driver ICs from inductive kickback during EPS motor commutation and fault shutdown. IC Role / Device Role / Timing Role: TVS mounted across motor driver supply rail and ground; diverts 276 A (8/20 µs) transients induced by MOSFET switching. Use Value: Reduces risk of gate oxide rupture in 40 V logic-level MOSFETs by limiting transient overshoot to <12 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ6.5A | Lower PPP (400 W), higher VCL (11.5 V at 50 A), SMC package (larger footprint, higher thermal mass) | Not AEC-Q101 qualified; rated for industrial/commercial only; lacks ISO 7637-2 Pulse 3a/b validation | Select when cost sensitivity outweighs automotive qualification and space constraints allow larger SMC footprint. |
| TPSMD6.5A | Same VRM/VBR, but higher RD (0.072 Ω), lower Tj max (150 °C), no ISO 7637-2 Pulse 1/3a validation | Limited to cabin electronics; unsuitable for engine bay or EPS due to thermal derating and missing pulse test data | Choose only for non-critical 12 V accessories where AEC-Q101 and full ISO compliance are not mandated. |
Compared with SMAJ6.5A and TPSMD6.5A, SM6F6.5AY delivers superior automotive readiness via AEC-Q101 certification, verified ISO 7637-2 Pulse 1/2a/3a/3b immunity, 175 °C operation, and tighter VCL/RD specs-enabling single-device compliance in safety-critical power domains.
Availability
SM6F6.5AY is available at Aetrix Electronics and suitable for automotive power line protection, ADAS sensor interface hardening, and body electronics ESD suppression requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SM6F6.5AY 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 SM6FY series belongs to ST's automotive-grade TVS portfolio, engineered specifically for ISO 7637-2 and ISO 10605 compliance in 12 V and 24 V vehicle electrical systems, emphasizing high-temperature stability and low-leakage planar construction.
FAQ
What is the maximum clamping voltage of SM6F6.5AY under a 10/1000 µs surge?
The maximum clamping voltage is 11.2 V at 56 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature at a rate defined by αT = 6.1 × 10⁻⁴ /°C, reaching ~12.1 V at Tj = 175 °C per datasheet calculation VCL(Tj) = VCL(25°C) × [1 + αT × (Tj − 25)].
Does SM6F6.5AY support bidirectional transient suppression?
No - SM6F6.5AY is a unidirectional TVS diode, meaning it clamps only positive transients on the cathode side and conducts negative transients through the anode to ground. For bidirectional protection, ST offers the SM6F6.5CA variant; this part is optimized for asymmetric 12 V automotive rail protection.
Can SM6F6.5AY be used in 24 V automotive systems?
It is not recommended for direct 24 V rail protection due to its 6.5 V stand-off voltage and 11.2 V clamping level, which would cause continuous conduction and thermal failure. It is intended for protected sub-circuits (e.g., LIN, CAN, sensor supplies) fed from regulated 5 V or 3.3 V rails derived from 12 V/24 V systems.
What is the soldering profile compliance for SM6F6.5AY?
SM6F6.5AY complies with J-STD-020 MSL Level 1 and supports peak reflow temperatures up to 260 °C for 10 seconds. Its recommended profile follows ST's ECOPACK® reflow curve: ramp rate ≤3 °C/s, preheat 150–180 °C for 60–90 s, soak 180–200 °C for 60–120 s, and peak at 240–245 °C for ≤30 s.
SM6F6.5AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- SOD-128
- Series:
- SM6F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 6.5V (Max)
- Voltage - Breakdown (Min):
- 7.2V
- Voltage - Clamping (Max) @ Ipp:
- 14.5V
- Current - Peak Pulse (10/1000µs):
- 276A (8/20µs)
- 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:
- SOD128Flat
SM6F6.5AY FAQ
1.How can I place an order for SM6F6.5AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6F6.5AY 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 SM6F6.5AY reliable?
The price and inventory of SM6F6.5AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6F6.5AY is usually 5 days.
3.What payment methods are accepted for SM6F6.5AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6F6.5AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6F6.5AY?
SM6F6.5AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6F6.5AY 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 SM6F6.5AY?
For technical support, including SM6F6.5AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6F6.5AY requirements.
6.How does Aetrix verify that SM6F6.5AY is sourced from the original manufacturer or authorized distributors?
All SM6F6.5AY 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 SM6F6.5AY meets industry standards.
7.What is the process for return or replacement of SM6F6.5AY?
All SM6F6.5AY units undergo pre-shipment inspection (PSI). If there is an issue with SM6F6.5AY, 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 SM6F6.5AY part is unused and in its original packaging.
Return procedure for SM6F6.5AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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