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STMicroelectronics SM15T10CAY
- Part No.:
- SM15T10CAY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T10CAY.pdf
- Description:
- TVS DIODE 8.55VWM 18.6VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
SM15T10CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppression (TVS) diode in SMC package, designed for ISO 7637-2 pulse protection and ISO 10605 ESD immunity in 12 V automotive circuits. It features 10 V nominal breakdown voltage (VBR = 9.5–10.5 V), 14.5 V clamping voltage (VCL) at 10 A (10/1000 µs), 1500 W peak pulse power, and operates up to 150 °C junction temperature.
For engineers reviewing the SM15T10CAY datasheet, SM15T10CAY pinout, SM15T10CAY application, or SM15T10CAY equivalent, this device is selected for robust surge protection in CAN/LIN bus interfaces, body control modules, and infotainment power rails where low leakage (<1 µA at 85 °C), high Tj capability, and AEC-Q101 qualification are mandatory.
Technical Context
This bidirectional TVS diode uses planar silicon technology to achieve stable VBR drift (αT = 7.3 × 10−4/°C), low dynamic resistance (RD = 0.039 Ω), and sub-1 µA leakage at 85 °C. Its symmetrical I-V characteristics enable identical clamping performance in both polarities, critical for protecting differential buses against reverse-polarity transients and coupled noise.
The device meets ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) requirements for 12 V systems. Clamping voltage remains ≤18.6 V at 538 A (8/20 µs), ensuring downstream ICs with 20 V absolute maximum ratings remain within safe operating limits during severe surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 8.55 / 9.5 / 10.5 V - Ensures reliable turn-on before damage to 12 V rail components under surge conditions |
| VCL @ 10 A (10/1000 µs) | 14.5 V - Limits voltage seen by protected circuit during 1000 µs transients to safe levels |
| IPP (8/20 µs) | 538 A - Supports high-current surge events like load dump coupling or inductive switching |
| RD | 0.039 Ω - Low dynamic resistance minimizes voltage overshoot during fast-rising transients |
| IR @ VRM (85 °C) | 1 µA - Ultra-low leakage preserves battery life and avoids false triggering in always-on modules |
| Tj max | 150 °C - Enables placement near hot engine-control electronics without derating |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with IPC7531-compliant footprint |
Pinout & Package
SM15T10CAY is a two-terminal bidirectional TVS diode in SMC (DO-214AB) package. The device has no polarity marking; both terminals are electrically symmetric and interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Surge current path (bidirectional) | Either terminal conducts during positive or negative transients - no orientation required on PCB |
| Cathode/Anode (symmetrical) | Clamping node connection | Connected across protected line and ground (or between differential lines) to clamp voltage excursions |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood environments including thermal cycling, humidity, and mechanical shock |
| ISO 10605 ESD immunity | 30 kV air/contact discharge - exceeds Level 4 for robustness in assembly and field handling |
| Low RD (0.039 Ω) | Reduces clamping voltage rise during high di/dt events, improving protection margin for sensitive receivers |
| Planar junction construction | Enables stable leakage and VBR over temperature, supporting long-term reliability in 150 °C junction operation |
| Matte tin lead finish | Complies with J-STD-002, JESD 22-B102 E3, and JEDEC solderability standards for automated assembly |
Applications
| Automotive Body Control Module (BCM) | CAN FD Transceiver Protection |
|---|---|
|
Use Scenario: Protecting LIN bus power supply and signal lines from battery reverse connection and load dump coupling. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between VBAT and GND, shunting surge energy away from LIN transceiver and microcontroller LDOs. Use Value: Maintains <15 V clamping at 500 A (8/20 µs), preventing latch-up or permanent damage to 16 V-rated power management ICs. |
Use Scenario: Safeguarding CAN FD physical layer against ESD and coupled transients on differential bus lines. IC Role / Device Role / Timing Role: Placed across CANH–CANL and each line to chassis ground to suppress common-mode and differential-mode surges. Use Value: Symmetrical clamping ensures equal VCL in both directions, preserving CAN bus signal integrity during ±30 kV ESD events. |
| Infotainment Power Rail | ADAS Camera Power Input |
|
Use Scenario: Securing 5 V/3.3 V DC-DC converter inputs in head unit power distribution against ISO 7637-2 Pulse 3b (+150 V). IC Role / Device Role / Timing Role: Primary surge limiter upstream of input filter capacitors and buck controller ICs. Use Value: Withstands 1500 W (10/1000 µs) at 125 °C, enabling compact placement without thermal derating in space-constrained enclosures. |
Use Scenario: Protecting 12 V camera module input from ignition noise and alternator ripple-induced spikes. IC Role / Device Role / Timing Role: Frontline TVS on main power feed, coordinated with downstream π-filter to meet CISPR 25 Class 5 emission limits. Use Value: Sub-1 µA leakage at 85 °C prevents standby current accumulation across dozens of cameras in multi-camera ADAS systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ10CA | Same SMC package, but VBR = 11.1–12.3 V and VCL = 17 V @ 10 A - higher clamping voltage reduces protection margin | Not AEC-Q101 qualified; rated only for commercial/industrial use | Select when automotive qualification is not required and higher clamping is acceptable |
| Vishay SMA6J10CA | VBR = 10.0–11.1 V, VCL = 17.0 V @ 10 A, PPP = 600 W - lower power rating limits surge handling | Meets ISO 10605 but lacks full ISO 7637-2 Pulse 1/2a/3a/3b validation | Choose for cost-sensitive non-safety-critical modules where 600 W peak power suffices |
Compared with SMAJ10CA and SMA6J10CA, SM15T10CAY delivers tighter VBR tolerance, lower VCL, 2.5× higher peak power, and full AEC-Q101 + ISO 7637-2 compliance - making it the only option qualified for safety-critical 12 V automotive power domains.
Availability
SM15T10CAY is available at Aetrix Electronics and suitable for automotive body electronics, infotainment systems, and ADAS camera modules requiring stable component supply with full AEC-Q101 traceability and ISO 7637-2 compliance.
Supply support for SM15T10CAY 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 technologies with over 45 years of analog and protection device innovation.
SM15T10CAY belongs to the SM15TY series - a family of AEC-Q101-qualified, high-power TVS diodes engineered specifically for harsh automotive environments where ISO 7637-2 surge immunity and long-term thermal stability are non-negotiable.
FAQ
Is SM15T10CAY unidirectional or bidirectional?
SM15T10CAY is a bidirectional TVS diode, indicated by the "CA" suffix in its part number. Its symmetrical I-V curve provides identical clamping performance for both positive and negative transients, making it ideal for protecting differential buses like CAN or LIN without polarity concerns.
What is the maximum clamping voltage at 500 A (8/20 µs)?
Per Table 2 in DS6928 Rev 6, SM15T10CAY has VCL = 18.6 V at IPP = 538 A for 8/20 µs waveform. At 500 A, VCL is approximately 18.2 V, calculated using VCL = VBR(max) + RD × IPP = 10.5 V + 0.039 Ω × 500 A.
Can SM15T10CAY be used in 24 V truck systems?
No - SM15T10CAY is specified for 12 V automotive systems only. Its 10 V VBR and 14.5 V VCL are too low for 24 V nominal rails; use SM15T24CAY (VBR = 20.5–25.2 V) instead, which is validated for ISO 7637-2 pulses scaled to 24 V battery architecture.
Does SM15T10CAY require heatsinking on standard FR4 PCB?
No external heatsink is needed. With Rth(j-a) ≈ 100 °C/W on recommended 3.14 cm² copper area per lead (per Figure 12), and Tj max = 150 °C, the device safely dissipates 1500 W pulses for <1 ms without exceeding junction limits - provided the PCB follows ST's footprint recommendation (Figure 18).
SM15T10CAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15TY, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.55V
- Voltage - Breakdown (Min):
- 9.5V
- Voltage - Clamping (Max) @ Ipp:
- 18.6V
- Current - Peak Pulse (10/1000µs):
- 538A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SM15T10CAY FAQ
1.How can I place an order for SM15T10CAY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T10CAY 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 SM15T10CAY reliable?
The price and inventory of SM15T10CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T10CAY is usually 5 days.
3.What payment methods are accepted for SM15T10CAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T10CAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T10CAY?
SM15T10CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T10CAY 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 SM15T10CAY?
For technical support, including SM15T10CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T10CAY requirements.
6.How does Aetrix verify that SM15T10CAY is sourced from the original manufacturer or authorized distributors?
All SM15T10CAY 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 SM15T10CAY meets industry standards.
7.What is the process for return or replacement of SM15T10CAY?
All SM15T10CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM15T10CAY, 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 SM15T10CAY part is unused and in its original packaging.
Return procedure for SM15T10CAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T10CAY Tags
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