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STMicroelectronics SM15T15AY
- Part No.:
- SM15T15AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T15AY.pdf
- Description:
- TVS DIODE 12.8VWM 27.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,169
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Product details
Overview
SM15T15AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMC package, designed to clamp transient surges up to 27.2 A (8/20 µs) with 21.2 V clamping voltage at 1 A, 15 V breakdown, and 1500 W peak pulse power (10/1000 µs), protecting CAN, LIN, and sensor interfaces in 12 V vehicle systems.
For engineers reviewing the SM15T15AY datasheet, SM15T15AY pinout, SM15T15AY application, or SM15T15AY equivalent, key selection criteria include clamping voltage at rated current, junction temperature derating of pulse power, ISO 7637-2 Pulse 1/2a/3a/3b compliance, and low leakage (<1 µA at 85 °C) for battery-sensitive circuits.
Technical Context
This device uses planar silicon technology to achieve stable breakdown voltage (12.8–15.8 V), low dynamic resistance (0.076 Ω at 10/1000 µs), and high junction temperature operation (−55 °C to +150 °C), enabling robust protection in under-hood ECUs where thermal cycling and long-term reliability are critical.
Its unidirectional configuration provides forward conduction path during negative transients (e.g., ISO 7637-2 Pulse 1: −150 V), while reverse-biased clamping handles positive surges (e.g., Pulse 2a: +112 V), with verified ESD immunity exceeding ±30 kV per ISO 10605 (C = 330 pF, R = 330 Ω).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 12.8 V min / 15 V nominal / 15.8 V max at 1 mA - ensures reliable turn-on before downstream IC damage |
| Clamping Voltage (VCL) | 21.2 V at 10 A (10/1000 µs) - limits protected node voltage below 24 V rail tolerance |
| Peak Pulse Power | 1500 W @ 10/1000 µs, 1250 W @ Tj = 150 °C - sustains surge energy without thermal runaway |
| Leakage Current (IR) | 0.2 µA @ 25 °C, 1 µA @ 85 °C - preserves battery drain budget in always-on modules |
| Dynamic Resistance (RD) | 0.076 Ω @ 10/1000 µs - minimizes voltage overshoot during fast-rising transients |
| ESD Withstand | ±30 kV air/contact discharge (ISO 10605, C = 330 pF) - exceeds automotive infotainment and ADAS interface requirements |
Pinout & Package
SM15T15AY is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (marked side) and Anode. The package meets IPC7531 footprint standards and JEDEC registered outline, supporting automated placement and reflow soldering per J-STD-020 MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge current sink during reverse-biased clamping | Connected to protected line (e.g., CAN_H); conducts when line voltage exceeds VBR |
| Anode | Reference/return path to ground or battery negative | Provides low-inductance return path for transient current; must be routed with minimal loop area |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock |
| Low leakage at high Tj | 1 µA @ 85 °C enables >10-year shelf life in always-on telematics modules |
| High Tj operation | Rated to +150 °C junction temperature supports placement near power converters or engine controllers |
| ISO 7637-2 compliance | Withstands Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), Pulse 3b (+150 V) without degradation |
Applications
| Body Control Module (BCM) | Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting LIN bus lines from load dump and alternator ripple in door module networks. IC Role / Device Role / Timing Role: Unidirectional TVS clamps negative transients on LIN data line while maintaining DC bias integrity. Use Value: Prevents microcontroller reset or LIN transceiver latch-up during battery disconnection events. | Use Scenario: Safeguarding analog sensor inputs (e.g., MAP, IAT) against ignition coil coupling noise. IC Role / Device Role / Timing Role: Fast-response clamping suppresses sub-100 ns spikes induced by high-dI/dt switching. Use Value: Maintains ADC accuracy by limiting input overvoltage to <22 V during cranking transients. |
| CAN Gateway | ADAS Camera Module |
Use Scenario: Shielding high-speed CAN FD physical layer from ESD and conducted surges in gateway nodes. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamping avoids signal integrity degradation on 5 Mbps CAN lines. Use Value: Enables >30 kV contact ESD protection without adding jitter or rise-time distortion. | Use Scenario: Guarding FPD-Link III serial video interface against hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Clamps transients on differential video pair while preserving common-mode range. Use Value: Prevents image corruption or serializer lockup during camera harness mating/unmating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A | Lower peak power (400 W), higher VCL (24.4 V @ 10 A), non-AEC-Q101 | Not qualified for automotive under-hood deployment; limited to industrial control panels | Select only if cost sensitivity outweighs AEC-Q101 compliance and thermal derating needs. |
| TPSMD15A | Same 15 V VBR, but 1000 W rating (10/1000 µs), lower leakage (0.5 µA @ 85 °C), AEC-Q101 certified | Marginally lower surge capacity; suitable for less aggressive ISO 7637-2 Pulse 3b environments | Prefer when board space allows larger SMC footprint and thermal margin is constrained. |
Compared with SMAJ15A and TPSMD15A, SM15T15AY delivers superior thermal stability at 150 °C, tighter VBR tolerance (±10%), and full ISO 7637-2 Pulse 1–3b coverage-making it optimal for safety-critical powertrain and chassis modules requiring zero field failure risk.
Availability
SM15T15AY is available at Aetrix Electronics and suitable for body control modules, engine control units, CAN gateways, and ADAS camera modules requiring stable component supply across automotive production lifecycles.
Supply support for SM15T15AY 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 specializing in automotive, industrial, and power management solutions, with over 40 years of innovation in protection devices and microcontrollers.
The SM15TxxAY 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 architectures.
FAQ
What is the maximum clamping voltage of SM15T15AY at 10 A (10/1000 µs)?
The maximum clamping voltage is 21.2 V at 10 A for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases linearly with junction temperature using αT = 8.4 × 10−4/°C, reaching ~23.5 V at Tj = 150 °C per datasheet Equation 2.
Is SM15T15AY compatible with lead-free reflow soldering?
Yes - SM15T15AY complies with J-STD-020 MSL Level 1 and supports peak reflow temperatures up to 245 °C for ≤30 seconds, matching ST's recommended profile with ramp rates of ≤3 °C/s and 60–90 second dwell above 217 °C.
How does SM15T15AY differ from its bidirectional counterpart SM15T15CAY?
SM15T15AY is unidirectional (anode-to-cathode conduction only), optimized for single-polarity protection like CAN_H or LIN; SM15T15CAY is bidirectional, providing symmetrical clamping for AC-coupled lines such as USB or audio, with identical VBR and VCL in both directions.
Can SM15T15AY be used in 24 V commercial vehicle systems?
No - its 15 V breakdown and 21.2 V clamping are designed for 12 V nominal systems. For 24 V applications, ST recommends SM15T27AY (27 V VBR) or SM15T33AY (33 V VBR) to maintain adequate margin above battery float voltage and load dump peaks.
SM15T15AY 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12.8V
- Voltage - Breakdown (Min):
- 14.3V
- Voltage - Clamping (Max) @ Ipp:
- 27.2V
- Current - Peak Pulse (10/1000µs):
- 368A (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
SM15T15AY FAQ
1.How can I place an order for SM15T15AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T15AY 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 SM15T15AY reliable?
The price and inventory of SM15T15AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T15AY is usually 5 days.
3.What payment methods are accepted for SM15T15AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T15AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T15AY?
SM15T15AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T15AY 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 SM15T15AY?
For technical support, including SM15T15AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T15AY requirements.
6.How does Aetrix verify that SM15T15AY is sourced from the original manufacturer or authorized distributors?
All SM15T15AY 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 SM15T15AY meets industry standards.
7.What is the process for return or replacement of SM15T15AY?
All SM15T15AY units undergo pre-shipment inspection (PSI). If there is an issue with SM15T15AY, 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 SM15T15AY part is unused and in its original packaging.
Return procedure for SM15T15AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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