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STMicroelectronics SM6F12AY
- Part No.:
- SM6F12AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- SOD-128
- Datasheet:
-
SM6F12AY.pdf
- Description:
- TVS DIODE 12VWM 25.3VC SOD128FLT
- Quantity:
- Payment:
- Shipping:
Inventory:5,885
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Product details
Overview
SM6F12AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SOD128 Flat package, designed to clamp transient surges up to 25.3 V at 157 A (8/20 µs) and 19.9 V at 31 A (10/1000 µs), with 600 W peak pulse power rating at 25 °C and 240 W at 175 °C junction temperature. It protects CAN, LIN, and sensor interfaces in 12 V automotive systems against ISO 7637-2 pulses and ISO 10605 ESD events.
For engineers reviewing the SM6F12AY datasheet, SM6F12AY pinout, SM6F12AY application, or SM6F12AY equivalent, this page delivers verified electrical parameters, thermal performance at 175 °C, clamping behavior under dual pulse standards (8/20 µs and 10/1000 µs), and direct replacement guidance for automotive-grade transient suppression.
Technical Context
The SM6F12AY uses planar silicon technology to achieve low leakage (0.2 µA at 25 °C, 1 µA at 85 °C) and stable breakdown voltage (13.3–14.7 V at 1 mA) across its operating junction temperature range of –55 °C to +175 °C. Its dynamic resistance is 0.168 Ω (10/1000 µs) and 0.068 Ω (8/20 µs), enabling precise clamping control during fast transients.
It complies with IEC 61000-4-4 Level 4 (±4 kV), exceeds ISO 10605 Level 4 (±30 kV air/contact discharge), and withstands ISO 7637-2 Pulse 1 (–150 V), Pulse 2a (+112 V), Pulse 3a (–220 V), and Pulse 3b (+150 V) - all validated for 12 V battery architectures without derating below battery voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 12 V - Maximum continuous reverse operating voltage before significant leakage; defines minimum system bus voltage compatibility. |
| Breakdown Voltage (VBR) | 13.3–14.7 V at 1 mA - Confirmed threshold where avalanche conduction begins; ensures reliable triggering above nominal 12 V rail. |
| Clamping Voltage (VCL) | 19.9 V at 31 A (10/1000 µs), 25.3 V at 157 A (8/20 µs) - Actual voltage seen by protected IC during surge; determines downstream component voltage stress margin. |
| Peak Pulse Power | 600 W (10/1000 µs, 25 °C), 240 W (10/1000 µs, 175 °C) - Sustained energy-handling capability at max junction temperature; enables under-hood deployment. |
| Leakage Current (IRM) | 0.2 µA at 25 °C, 1 µA at 85 °C - Ultra-low reverse current preserves battery drain budgets in always-on automotive modules. |
| Junction Temperature Range | –55 °C to +175 °C - Validated operation across full automotive under-hood thermal envelope; no derating required up to Tj = 175 °C. |
| ESD Withstand | ±30 kV contact/air (ISO 10605, C = 330 pF/R = 330 Ω) - Exceeds Level 4 immunity; eliminates need for external ESD staging in infotainment and ADAS sensors. |
Pinout & Package
SOD128 Flat package: surface-mount, single-ended unidirectional configuration with cathode band marking; dimensions per JEDEC MO-290: 4.7 mm × 2.4 mm × 1.0 mm (L × W × H), matte tin-plated leads compliant with J-STD-002 and MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink path to ground | Connected to protected line; conducts surge current when clamping threshold exceeded. |
| Cathode | Reference node tied to system ground or power rail | Provides low-impedance return path; must be routed with minimal inductance to maintain clamping integrity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, mechanical shock, and humidity testing - enables direct integration into safety-critical ECUs. |
| High-Tj operation at 175 °C | Maintains full 240 W surge capability at maximum junction temperature - supports placement near engines, inverters, and DC-DC converters. |
| Low dynamic resistance | 0.068 Ω (8/20 µs) - minimizes VCL overshoot during fast transients, protecting high-speed CAN FD and LIN PHYs. |
| Planar silicon construction | Enables <1 µA leakage at 85 °C - critical for low-power always-on vehicle networks and battery monitoring circuits. |
| ISO 7637-2 compliance | Rated for Pulse 1 (–150 V), Pulse 2a (+112 V), Pulse 3a (–220 V), Pulse 3b (+150 V) - covers all standard automotive load-dump and inductive-switching threats. |
Applications
| Automotive CAN Bus Protection | Body Control Module (BCM) Inputs |
|---|---|
|
Use Scenario: Protecting high-speed CAN FD transceivers (e.g., TJA1044GK) from coupled transients on 12 V supply and data lines during load dump or alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between CAN_H/CAN_L and chassis ground, clamping common-mode surges while preserving signal integrity. Use Value: Clamps to ≤25.3 V at 157 A (8/20 µs), ensuring transceiver survival under ISO 7637-2 Pulse 3b (+150 V) without latch-up or parametric shift. |
Use Scenario: Shielding microcontroller GPIOs and analog sensor inputs (e.g., door lock switches, ambient light sensors) from ESD and battery-line transients in BCM PCBs. IC Role / Device Role / Timing Role: Point-of-entry protection on each input trace, mounted adjacent to connector to minimize inductance. Use Value: Delivers ±30 kV ESD immunity (ISO 10605) and holds leakage to 0.2 µA at 25 °C - prevents false wake-ups and ADC offset drift in low-power sleep modes. |
| ADAS Camera Power Rail | Electric Power Steering (EPS) Sensor Interface |
|
Use Scenario: Safeguarding 12 V input to image sensor SoCs (e.g., MAX96712) exposed to engine bay transients during cold cranking and ignition noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail, upstream of LDO regulators and DC-DC converters. Use Value: Sustains 240 W clamping at 175 °C junction temperature - maintains protection efficacy even when mounted directly on EPS motor housing or radiator bracket. |
Use Scenario: Protecting torque and position sensor signals (e.g., AS5055A magnetic encoder) connected to EPS ECU against inductive kickback from motor drivers. IC Role / Device Role / Timing Role: Bidirectional-capable layout using two unidirectional devices (anode-to-rail, cathode-to-ground) for differential signal lines. Use Value: Achieves 19.9 V clamping at 31 A (10/1000 µs) with 0.168 Ω RD - limits voltage excursion to within ±10% of sensor supply, preventing ADC saturation or SPI CRC errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | Lower peak power (400 W @ 10/1000 µs), higher VCL (23.2 V @ 24.7 A), not AEC-Q101 qualified | Limited to non-automotive industrial or consumer use; unsuitable for under-hood deployment due to 150 °C Tj max | Select only for cost-sensitive non-automotive designs where ISO 7637-2 compliance is not required. |
| 1.5KE12A | Through-hole DO-15 package, 1500 W rating but 200 ns response time vs. sub-1 ns for SM6F12AY; no automotive qualification | Requires board real estate and wave-solder process; incompatible with automated SMT lines and high-density automotive PCBs | Use only for legacy through-hole prototyping or repair where footprint change is prohibited. |
Compared with SMAJ12A and 1.5KE12A, SM6F12AY uniquely combines AEC-Q101 qualification, SOD128 surface-mount compatibility, 175 °C junction operation, and sub-1 ns response - making it the sole choice for production automotive electronics requiring zero derating in harsh thermal environments.
Availability
SM6F12AY is available at Aetrix Electronics and suitable for automotive electronic control units (ECUs), ADAS camera modules, body control modules (BCMs), and electric power steering (EPS) systems requiring stable component supply across extended temperature and surge stress conditions.
Supply support for SM6F12AY 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, delivering intelligent power, sensing, and connectivity solutions for automotive, industrial, and consumer markets.
The SM6FY series belongs to ST's automotive-grade transient voltage suppression portfolio, engineered specifically to meet ISO 7637-2 and ISO 10605 requirements for next-generation vehicle electronics with extended thermal resilience and zero derating up to 175 °C.
FAQ
What is the maximum clamping voltage of SM6F12AY under an 8/20 µs surge?
The maximum clamping voltage is 25.3 V at 157 A for an 8/20 µs waveform, measured at Tj = 25 °C. This value increases with junction temperature at a rate defined by αT = 8.3 × 10⁻⁴ /°C, so at 175 °C, VCL ≈ 29.1 V - still within safe margins for 3.3 V and 5 V automotive ICs with 30 V absolute maximum ratings.
Can SM6F12AY be used in bidirectional configurations?
No - SM6F12AY is strictly unidirectional. Its internal structure allows conduction only from cathode to anode during reverse-bias transients. For bidirectional protection, two SM6F12AY devices must be connected in series opposition (anode-to-anode or cathode-to-cathode), or a dedicated bidirectional part like SMBJ12CA should be selected.
Does SM6F12AY require derating at elevated ambient temperatures?
No derating is needed for surge power handling up to Tj = 175 °C. The datasheet confirms 240 W peak pulse power at 175 °C (10/1000 µs), meaning thermal design must ensure junction temperature stays within limits via proper copper pour and airflow - but no electrical parameter reduction is required.
What is the marking code for SM6F12AY on the device body?
The top-side marking is "5AWY", as specified in Table 6 of DS13062 Rev 3. This 4-character laser mark appears on the cathode-end of the SOD128 Flat package and is used for traceability and reel-level verification during SMT assembly.
SM6F12AY 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):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 25.3V
- Current - Peak Pulse (10/1000µs):
- 157A (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
SM6F12AY FAQ
1.How can I place an order for SM6F12AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6F12AY 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 SM6F12AY reliable?
The price and inventory of SM6F12AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6F12AY is usually 5 days.
3.What payment methods are accepted for SM6F12AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6F12AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6F12AY?
SM6F12AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6F12AY 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 SM6F12AY?
For technical support, including SM6F12AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6F12AY requirements.
6.How does Aetrix verify that SM6F12AY is sourced from the original manufacturer or authorized distributors?
All SM6F12AY 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 SM6F12AY meets industry standards.
7.What is the process for return or replacement of SM6F12AY?
All SM6F12AY units undergo pre-shipment inspection (PSI). If there is an issue with SM6F12AY, 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 SM6F12AY part is unused and in its original packaging.
Return procedure for SM6F12AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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