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STMicroelectronics SM15T27CAY
- Part No.:
- SM15T27CAY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T27CAY.pdf
- Description:
- TVS DIODE 23.1VWM 48.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,559
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Product details
Overview
SM15T27CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppressor (TVS) diode in SMC package, designed for ISO 7637-2 pulse protection in 12 V vehicle systems. It features a 27 V nominal breakdown voltage (VBR = 23.1–28.4 V), 37.5 A peak pulse current (IPP) at 10/1000 µs, 48.3 A at 8/20 µs, clamping voltage of 40 V (max), and leakage current ≤0.2 µA at 25 °C - enabling robust ESD and surge protection for LIN bus, body control modules, and sensor interfaces.
For engineers reviewing the SM15T27CAY datasheet, SM15T27CAY pinout, SM15T27CAY application, or SM15T27CAY equivalent, this part is selected for high-reliability automotive circuits requiring AEC-Q101 qualification, low leakage at elevated junction temperature (Tj up to 150 °C), and compliance with ISO 10605 (±30 kV), IEC 61000-4-4 (4 kV), and ISO 7637-2 (Pulse 1/2a/3a/3b).
Technical Context
The SM15T27CAY employs planar silicon technology optimized for stable VBR drift (αT = 9.6 × 10−4/°C) and low dynamic resistance (RD = 0.076 Ω at 10/1000 µs). Its bidirectional structure provides symmetrical clamping for both positive and negative transients without polarity dependency.
It delivers 1500 W peak pulse power (10/1000 µs) at Tamb = 25 °C and maintains 1250 W at Tj = 150 °C, validated per JEDEC JESD22-A108 thermal cycling and J-STD-020 MSL Level 1 reflow compatibility - supporting under-hood deployment in engine control units and ADAS front-end electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 23.1 / 25.7 / 28.4 V - ensures reliable turn-on before system-level damage during ISO 7637-2 Pulse 1 (−150 V) and Pulse 3a (−220 V). |
| VCL (10/1000 µs) | 40 V max - limits downstream IC stress to safe levels for 3.3 V/5 V microcontrollers and CAN/LIN transceivers. |
| IPP (10/1000 µs) | 37.5 A - supports full energy absorption of ISO 7637-2 Pulse 2a (+112 V) on 12 V battery lines. |
| RD | 0.076 Ω - minimizes voltage overshoot during fast-rising ESD events (IEC 61000-4-2, ±30 kV contact). |
| IR @ VRM | ≤0.2 µA at 25 °C - prevents signal integrity degradation in high-impedance sensor bias networks. |
| Tj max | 150 °C - enables operation near engine compartments without derating in continuous-duty automotive environments. |
| Package | SMC (DO-214AB) - IPC7531-compliant footprint with 7.75–8.15 mm body width and matte tin-plated leads for solderability. |
Pinout & Package
SM15T27CAY 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 (bidirectional) | Transient current path | Conducts surge current in either direction when reverse voltage exceeds VBR; no DC bias polarity required. |
| Cathode/Anode (bidirectional) | Transient current return path | Completes low-impedance clamping loop across protected line and ground or supply rail. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock per JESD22 standards. |
| ISO 10605 ESD immunity | ±30 kV air/contact discharge - exceeds Level 4, eliminating need for external ESD filters in infotainment and gateway ECUs. |
| Low leakage at high Tj | ≤1 µA at 85 °C - preserves battery life in always-on modules like telematics and alarm controllers. |
| High-power capability at Tj = 150 °C | 1250 W (10/1000 µs) - sustains surge protection performance in under-hood ambient temperatures up to 125 °C. |
| Matte tin lead finish | J-STD-002/E3 compliant - ensures reliable solder joint formation with Pb-free reflow profiles and zero whisker risk (JESD201 Class 2). |
Applications
| Body Control Module (BCM) | LIN Bus Interface |
|---|---|
|
Use Scenario: Protecting door lock actuators, window lift motors, and interior lighting drivers from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between 12 V supply rail and ground, absorbing ISO 7637-2 Pulse 1 (−150 V) and Pulse 3b (+150 V). Use Value: Prevents latch-up or permanent damage to MCU GPIOs and driver ICs operating at 5 V or 3.3 V logic levels. |
Use Scenario: Safeguarding LIN transceivers (e.g., TLE7259-3GE) against ESD and coupled transients from adjacent high-current wiring. IC Role / Device Role / Timing Role: Parallel-connected TVS across LIN data line and ground, responding within <1 ns to ±30 kV ESD events per ISO 10605. Use Value: Maintains LIN signal integrity (20 kbps) by limiting clamped voltage to ≤40 V, avoiding false dominant/recessive state detection. |
| Engine Coolant Temperature Sensor | Automotive Camera Power Input |
|
Use Scenario: Shielding NTC-based temperature sensing circuits from ignition noise and alternator ripple-induced surges. IC Role / Device Role / Timing Role: Low-leakage (≤0.2 µA) TVS placed at sensor harness entry point, minimizing DC error in precision voltage-divider bias networks. Use Value: Enables accurate sub-0.5 °C temperature resolution over −40 to +150 °C ambient range without calibration drift. |
Use Scenario: Protecting 12 V input of rear-view or surround-view camera modules from jump-start transients and battery reversal. IC Role / Device Role / Timing Role: Primary surge clamp on main power rail, rated for 1500 W (10/1000 µs) and compliant with ISO 7637-2 Pulse 2a (+112 V). Use Value: Ensures uninterrupted video streaming during cold-cranking events by preventing brownout or reset of image signal processors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28CA | Lower peak power (400 W), higher VCL (45.4 V), non-AEC-Q101 qualified | Not suitable for under-hood automotive use; limited to consumer or industrial 12 V systems | Select only if cost sensitivity outweighs automotive reliability requirements and surge energy is below 100 mJ. |
| SMBJ28CA | Same SMC package but lower IPP (24.9 A at 10/1000 µs), VCL = 43.5 V, AEC-Q101 qualified | Marginally meets ISO 7637-2 Pulse 1; insufficient for Pulse 3a (−220 V) in high-energy harnesses | Acceptable for cabin modules with short cable runs; avoid in engine bay or chassis-grounded systems. |
Compared with SMAJ28CA and SMBJ28CA, SM15T27CAY delivers 3.75× higher peak power, 5 V lower clamping voltage, and guaranteed AEC-Q101 qualification - making it the only choice for full-scope ISO 7637-2 compliance in safety-critical automotive subsystems.
Availability
SM15T27CAY is available at Aetrix Electronics and suitable for body control modules, LIN bus interfaces, engine sensor protection, and automotive camera power inputs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SM15T27CAY 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, analog, MEMS, and microcontroller solutions for automotive, industrial, and consumer markets.
The SM15Txx series belongs to ST's automotive-grade TVS portfolio, engineered specifically for robustness against ISO 7637-2 load dump, ISO 10605 ESD, and IEC 61000-4-4 fast transients in 12 V and 24 V vehicle architectures.
FAQ
Is SM15T27CAY unidirectional or bidirectional?
SM15T27CAY is a bidirectional TVS diode, indicated by the "CA" suffix in its order code. It provides symmetrical clamping for both positive- and negative-polarity transients without requiring orientation during PCB placement - essential for protecting differential buses like LIN and analog sensor inputs where polarity is undefined.
What is the maximum clamping voltage at 8/20 µs surge?
The maximum clamping voltage (VCL) for SM15T27CAY under an 8/20 µs waveform is 48.3 V at 48.3 A peak current. This value is specified in Table 2 of DS6928 Rev 6 and ensures protected ICs experience less than 50 V stress during high-energy lightning-like surges defined in IEC 61000-4-5.
Does SM15T27CAY meet AEC-Q101 requirements?
Yes, SM15T27CAY is explicitly qualified to AEC-Q101 Rev D, covering stress tests including HTGB, HTRB, TCT, UHAST, and mechanical shock. Certification documentation is available in ST's official product change notices and qualification reports referenced in DS6928.
Can SM15T27CAY replace SM15T24CAY in existing designs?
Yes, SM15T27CAY can directly replace SM15T24CAY in most cases: both share identical SMC package, bidirectional configuration, and AEC-Q101 qualification. However, its higher VBR (23.1–28.4 V vs. 20.5–25.2 V) raises clamping threshold by ~3 V - verify that protected circuitry tolerates the increased let-through voltage during marginal transients.
SM15T27CAY 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):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 48.3V
- Current - Peak Pulse (10/1000µs):
- 207A (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
SM15T27CAY FAQ
1.How can I place an order for SM15T27CAY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T27CAY 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 SM15T27CAY reliable?
The price and inventory of SM15T27CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T27CAY is usually 5 days.
3.What payment methods are accepted for SM15T27CAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T27CAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T27CAY?
SM15T27CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T27CAY 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 SM15T27CAY?
For technical support, including SM15T27CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T27CAY requirements.
6.How does Aetrix verify that SM15T27CAY is sourced from the original manufacturer or authorized distributors?
All SM15T27CAY 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 SM15T27CAY meets industry standards.
7.What is the process for return or replacement of SM15T27CAY?
All SM15T27CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM15T27CAY, 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 SM15T27CAY part is unused and in its original packaging.
Return procedure for SM15T27CAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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