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STMicroelectronics SM15T30CAY
- Part No.:
- SM15T30CAY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T30CAY.pdf
- Description:
- TVS DIODE 25.6VWM 53.5VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,484
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Product details
Overview
SM15T30CAY 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/24 V vehicle systems. It features a 30 V nominal breakdown voltage (VBR = 25.6–31.5 V), 41.5 V clamping voltage (VCL) at 36 A (10/1000 µs), 1500 W peak pulse power, and ≤0.2 µA leakage at 25 °C - enabling robust surge resilience in engine control units and body electronics.
For engineers reviewing the SM15T30CAY datasheet, SM15T30CAY pinout, SM15T30CAY application, or SM15T30CAY equivalent, this device is selected for high-reliability automotive circuit protection where bidirectional clamping, low leakage, AEC-Q101 qualification, and stable performance up to 150 °C junction temperature are mandatory design requirements.
Technical Context
This TVS diode uses planar silicon technology to achieve low dynamic resistance (RD = 0.278 Ω at 25 °C), precise voltage tolerance, and minimal capacitance (≈300 pF at 0 V, f = 1 MHz), making it suitable for protecting CAN, LIN, and sensor interfaces without signal integrity degradation. Its bidirectional configuration ensures symmetrical clamping for both positive and negative transients.
The device complies with ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V), and exceeds IEC 61000-4-2 Level 4 ESD (±30 kV air/contact discharge) and IEC 61000-4-4 Level 4 (±4 kV). Thermal derating follows a defined curve: maximum peak pulse power drops to 1250 W at Tj = 150 °C (10/1000 µs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 25.6 / 28.5 / 31.5 V - defines minimum voltage at which avalanche conduction begins under 1 mA test current; ensures reliable turn-on before downstream IC damage. |
| VCL @ IPP = 36 A (10/1000 µs) | 41.5 V - maximum clamped voltage seen by protected circuit during 1500 W surge; determines safe overvoltage margin for 33 V-rated components. |
| IPP (8/20 µs) | 187 A - peak current handling capability under fast lightning-like surges; supports compliance with ISO 7637-2 Pulse 3b and IEC 61000-4-5. |
| RD (dynamic resistance) | 0.278 Ω - low impedance during clamping reduces voltage overshoot and improves energy absorption linearity across pulse durations. |
| IR @ VRM = 24.3 V | 0.2 µA at 25 °C - ultra-low reverse leakage preserves battery drain budgets in always-on automotive modules like door controllers. |
| Tj max | 150 °C - enables operation in under-hood environments (e.g., near engine ECUs) without thermal shutdown or parameter drift. |
| AEC-Q101 qualified | Validated for automotive use per stress test conditions including HTOL, TC, UHAST, and ESD - required for ASIL-B/C system integration. |
Pinout & Package
SM15T30CAY is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (K) and Anode (A). The bidirectional structure means both terminals function symmetrically as clamping nodes - no polarity dependency in circuit layout. Matte tin-plated leads ensure solderability per J-STD-002 and JESD 22-B102 E3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Surge input node (bidirectional) | Accepts transient energy from either polarity; connects to protected line (e.g., CAN_H or LIN bus). |
| Cathode (K) | Surge return node (bidirectional) | Completes clamping path to ground or reference rail; symmetrical with Anode for ± transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of differential buses (e.g., CAN FD) without external polarity management or dual-diode arrangements. |
| AEC-Q101 qualification | Confirms reliability for automotive applications including engine control, ADAS sensors, and infotainment power rails - no additional qualification testing needed. |
| Low dynamic resistance (0.278 Ω) | Reduces clamping voltage rise under high-current pulses, preserving margin for 3.3 V/5 V microcontrollers and transceivers. |
| Junction temperature rating (150 °C) | Supports placement near heat sources (e.g., power inverters) while maintaining specified VBR, VCL, and leakage performance. |
| ISO 7637-2 Pulse 1/2a/3a/3b compliance | Validates protection against load dump, alternator switching, and inductive kickback in 12 V/24 V vehicle architectures without external filtering. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting 12 V supply inputs and sensor signal lines (e.g., MAP, TPS) from load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed at ECU power entry point and analog front-end inputs to clamp surges before LDOs and ADCs. Use Value: Prevents latch-up or permanent damage to MCU and precision analog circuits during cold-cranking or battery disconnection events. |
Use Scenario: Safeguarding LIN bus lines and door module power rails against ESD and electro-mechanical switch bounce. IC Role / Device Role / Timing Role: TVS mounted directly at connector interface to absorb ±30 kV contact discharge and ISO 7637-2 Pulse 3a (−220 V). Use Value: Eliminates need for secondary protection stages, reducing BOM count and PCB area while meeting OEM EMC validation requirements. |
| Advanced Driver Assistance Systems (ADAS) | Infotainment Head Unit Power Supply |
|
Use Scenario: Shielding camera and radar sensor power and data lines from coupled transients in proximity to high-power actuators. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS on FAKRA or LVDS interfaces to suppress noise without degrading signal rise time. Use Value: Maintains signal integrity for 1–6 Gbps video links while providing >1500 W surge immunity per line. |
Use Scenario: Securing 5 V/3.3 V DC-DC converter outputs feeding audio processors and display drivers against conducted surges. IC Role / Device Role / Timing Role: TVS placed post-regulator to protect downstream logic from back-fed transients originating in USB or HDMI ports. Use Value: Avoids brown-out resets and memory corruption during hot-swap events or cable ESD coupling into USB-C connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | 33 V VBR, 53.3 V VCL @ 28.3 A, 400 W PPP, SMA package | Limited to lower-energy surges; not AEC-Q101 qualified; unsuitable for ISO 7637-2 Pulse 1/3b compliance. | Select only for non-automotive industrial applications with <500 W surge requirements and no automotive qualification mandate. |
| SMBJ33CA | 33 V VBR, 53.3 V VCL @ 28.3 A, 600 W PPP, SMB package | Lower peak power rating and no AEC-Q101 validation; lacks thermal derating data above 125 °C. | Use where space constraints favor SMB footprint but full automotive surge immunity is not required. |
Compared with SMAJ33CA and SMBJ33CA, SM15T30CAY delivers 2.5× higher peak pulse power, AEC-Q101 qualification, validated 150 °C operation, and guaranteed ISO 7637-2 Pulse 1/2a/3a/3b compliance - making it the only option for ASIL-compliant power domain protection in modern vehicles.
Availability
SM15T30CAY is available at Aetrix Electronics and suitable for automotive electronic control units, body control modules, ADAS sensor interfaces, and infotainment power supplies requiring stable component supply across multi-year production cycles.
Supply support for SM15T30CAY 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 SM15Txx series belongs to ST's automotive-grade TVS portfolio, engineered specifically for robust transient immunity in harsh vehicle environments - targeting ISO 7637-2, ISO 10605, and IEC 61000-4-x compliance without external circuitry.
FAQ
What is the difference between SM15T30AY and SM15T30CAY?
SM15T30AY is unidirectional (anode-to-cathode conduction only), suited for DC-biased lines like power rails; SM15T30CAY is bidirectional, with symmetrical clamping for AC-coupled or differential buses such as CAN, LIN, or RS-485. Their marking codes (MERY vs. BERY) and VF forward characteristics differ accordingly.
Can SM15T30CAY be used in 24 V commercial vehicle systems?
Yes - its 30 V VBR and 41.5 V VCL provide adequate margin above 24 V nominal systems (including 28 V alternator regulation), and it meets ISO 7637-2 Pulse 1 (−150 V) and Pulse 3b (+150 V), which cover heavy-duty truck electrical stress profiles.
Does SM15T30CAY require a heatsink for 1500 W surge handling?
No - the SMC package and planar die design enable full 1500 W (10/1000 µs) dissipation without external heatsinking when mounted on a standard FR4 PCB with ≥3 cm² copper area per lead, as verified in Figure 12 of DS6928.
How does temperature affect clamping voltage in SM15T30CAY?
VCL increases linearly with junction temperature at αT = 9.7 × 10−4/°C; at Tj = 150 °C, VCL rises ≈12% over its 25 °C value (41.5 V → ~46.5 V), a known and modeled behavior used in worst-case circuit analysis.
SM15T30CAY 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):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 53.5V
- Current - Peak Pulse (10/1000µs):
- 187A (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
SM15T30CAY FAQ
1.How can I place an order for SM15T30CAY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T30CAY 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 SM15T30CAY reliable?
The price and inventory of SM15T30CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T30CAY is usually 5 days.
3.What payment methods are accepted for SM15T30CAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T30CAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T30CAY?
SM15T30CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T30CAY 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 SM15T30CAY?
For technical support, including SM15T30CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T30CAY requirements.
6.How does Aetrix verify that SM15T30CAY is sourced from the original manufacturer or authorized distributors?
All SM15T30CAY 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 SM15T30CAY meets industry standards.
7.What is the process for return or replacement of SM15T30CAY?
All SM15T30CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM15T30CAY, 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 SM15T30CAY part is unused and in its original packaging.
Return procedure for SM15T30CAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T30CAY Tags
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