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STMicroelectronics SM6T15CAY
- Part No.:
- SM6T15CAY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T15CAY.pdf
- Description:
- TVS DIODE 12.8VWM 21.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,183
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Product details
Overview
SM6T15CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppression (TVS) diode in SMB package, designed for ISO 7637-2 pulse protection and IEC 61000-4-2 ESD immunity. It features a 15 V standoff voltage (VRM), 21.2 V clamping voltage (VCL) at 28 A peak pulse current (IPP), 600 W peak pulse power (10/1000 µs), and operates up to 150 °C junction temperature - deployed in 12 V automotive power line protection.
For engineers reviewing the SM6T15CAY datasheet, SM6T15CAY pinout, SM6T15CAY application, or SM6T15CAY equivalent, key selection criteria include bidirectional surge clamping capability, low leakage (<1 µA at 85 °C), AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/3a/3b compliance, and SMB footprint compatibility with IPC7531.
Technical Context
This bidirectional TVS diode uses planar silicon technology to achieve stable breakdown behavior across temperature (αT = 8.4 × 10⁻⁴ /°C), low dynamic resistance (RD = 0.193 Ω), and high reliability under repeated surge stress. Its symmetrical I-V characteristics enable equal clamping in both polarities - critical for protecting CAN, LIN, and sensor supply lines against reverse battery and load dump transients.
The device meets stringent automotive EMC requirements: ISO 10605 (±30 kV contact/air discharge), IEC 61000-4-4 Level 4 (±4 kV), and ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) - all validated at Tj = 150 °C with derated power up to 515 W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 15 V - maximum continuous reverse operating voltage before significant leakage; defines minimum system operating margin. |
| Breakdown Voltage (VBR) | 12.8–15.8 V at 1 mA - sharp, repeatable avalanche onset enabling precise overvoltage thresholding. |
| Clamping Voltage (VCL) | 21.2 V at 28 A (10/1000 µs) - limits transient voltage seen by downstream ICs during surge events. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - sustains high-energy transients without failure; derates to 515 W at Tj = 150 °C. |
| Leakage Current (IRM) | 0.2 µA at 25 °C, 1 µA at 85 °C - ensures minimal standby power loss and signal integrity in always-on circuits. |
| Junction Temperature Range | −55 to +150 °C - supports under-hood placement and long-term reliability in harsh thermal environments. |
| Dynamic Resistance (RD) | 0.193 Ω - determines voltage rise under surge current (ΔV = RD × IPP); enables tight clamping control. |
Pinout & Package
SM6T15CAY is housed in an SMB (DO-214AA) surface-mount package with two terminals: Cathode (K) and Anode (A). The bidirectional configuration means both terminals behave identically under reverse polarity - no dedicated cathode/anode orientation required in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode (for unidirectional reference) | Acts as either anode or cathode depending on applied polarity; symmetric conduction enables bidirectional clamping. |
| Terminal 2 | Cathode (for unidirectional reference) | Same as Terminal 1 - interchangeable due to symmetrical internal structure; no polarity marking required for function. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test conditions including HTOL, TC, HAST, and ESD - eliminates qualification burden for Tier 1 designs. |
| Bidirectional clamping | Identical VBR and VCL in both directions - protects against reverse battery, load dump, and double-polarity transients without external polarity management. |
| Low dynamic resistance | 0.193 Ω - minimizes clamping voltage overshoot during fast-rising surges (e.g., ISO 7637-2 Pulse 3b), improving IC survivability. |
| High-temperature operation | Rated to 150 °C junction temperature with full 600 W pulse capability at 25 °C and 515 W at 150 °C - enables compact placement near heat sources. |
| Matte tin lead finish | Complies with J-STD-002, JESD 22-B102 E3, and JEDEC solderability standards - ensures robust reflow yield and long-term intermetallic stability. |
Applications
| Engine Control Unit (ECU) Power Input | CAN Bus Transceiver Protection |
|---|---|
|
Use Scenario: 12 V battery feed to microcontroller power rails subjected to load dump (ISO 7637-2 Pulse 2a) and reverse battery connection. IC Role / Device Role: Primary overvoltage clamp limiting input voltage to ≤21.2 V during 112 V transients. Use Value: Prevents LDO regulator latch-up and MCU brownout by maintaining rail integrity below 24 V during 100 ms pulses. |
Use Scenario: CANH/CANL lines exposed to ESD events (IEC 61000-4-2 ±30 kV) and coupled transients from adjacent power traces. IC Role / Device Role: Bidirectional shunt protector placed between CANH–CANL and ground to suppress common-mode surges. Use Value: Maintains <100 pF capacitance at 0 V bias (per datasheet Fig. 8), preserving CAN signal edge rate and bit timing integrity. |
| Body Control Module (BCM) Sensor Supply | Automotive Lighting Driver Input |
|
Use Scenario: 5–12 V regulated supply to Hall-effect position sensors and ambient light sensors in door modules. IC Role / Device Role: Low-leakage (≤1 µA at 85 °C) transient suppressor ensuring sensor offset stability during ignition noise bursts. Use Value: Eliminates false triggering caused by >10 V spikes on 5 V rails while adding <0.5 mV offset error in steady state. |
Use Scenario: Input stage of LED driver IC powering headlamps, subjected to ISO 7637-2 Pulse 1 (−150 V) and Pulse 3a (−220 V). IC Role / Device Role: High-energy clamping element absorbing >100 mJ pulses without degradation over 10⁵ cycles. Use Value: Enables single-stage protection without series impedance, reducing BOM count and PCB area versus RC+TVS solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15CA | Same SMB package, 15 V VRM, but lower PPP = 600 W (10/1000 µs) and higher VCL = 24.4 V at 24.4 A; no AEC-Q101 qualification. | Lacks automotive qualification and fails ISO 7637-2 Pulse 3a (−220 V) margin due to higher clamping voltage. | Select only for non-automotive industrial applications where AEC-Q101 and full pulse compliance are not required. |
| TPSMA6L15CA | Same VRM and bidirectional function, but SOD-123FL package (smaller), lower IPP = 22.5 A, and VCL = 23.2 V; AEC-Q101 qualified. | Lower surge current handling reduces margin for high-energy load dump; smaller footprint limits thermal dissipation. | Prefer for space-constrained modules where 22.5 A IPP suffices and board-level thermal design accommodates reduced copper area. |
Compared with SMBJ15CA and TPSMA6L15CA, SM6T15CAY delivers superior automotive robustness via lower clamping (21.2 V vs. ≥23.2 V), higher surge current rating (28 A), and verified ISO 7637-2 Pulse 3a compliance - making it the preferred choice for safety-critical 12 V power rail protection.
Availability
SM6T15CAY is available at Aetrix Electronics and suitable for engine control units, body control modules, infotainment power supplies, and ADAS camera modules requiring stable component supply with full automotive qualification traceability.
Supply support for SM6T15CAY 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, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.
The SM6TY series belongs to ST's automotive-qualified Transil™ TVS portfolio, engineered specifically to meet ISO 7637-2 and ISO 10605 requirements for vehicle electronic subsystems - emphasizing reliability, low leakage, and high-temperature surge resilience.
FAQ
What is the difference between SM6T15AY and SM6T15CAY?
SM6T15AY is unidirectional (anode-cathode asymmetry), while SM6T15CAY is bidirectional (symmetrical clamping in both polarities). The 'C' suffix denotes bidirectional functionality - critical for protecting differential buses like CAN or lines subject to reverse battery faults. Electrical parameters differ slightly: SM6T15CAY has identical VBR min/max in both directions, whereas SM6T15AY specifies VBR only for reverse bias.
Does SM6T15CAY require a heatsink for 600 W pulse handling?
No external heatsink is required for single-pulse 600 W (10/1000 µs) events. The SMB package achieves this via short thermal time constants; Figure 11 shows Zth(j-a) ≈ 40 °C/W for tp = 1 ms. Continuous power dissipation remains limited to ~1 W - the 600 W rating applies only to transient, non-repetitive surges.
Can SM6T15CAY be used in 24 V commercial vehicle systems?
No - its 15 V standoff voltage is optimized for 12 V nominal systems. For 24 V applications, ST recommends SM6T27CAY (27 V VRM) or SM6T33CAY (33 V VRM), which provide appropriate margin above 28 V max battery voltage and maintain clamping below 45 V during load dump.
How does temperature affect clamping voltage in SM6T15CAY?
VCL increases with junction temperature at αT = 8.4 × 10⁻⁴ /°C. At Tj = 125 °C, VCL rises by ~0.85 V versus 25 °C (21.2 V → ~22.05 V). This positive tempco is inherent to avalanche diodes and must be factored into worst-case transient margin analysis for under-hood deployments.
SM6T15CAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6TY, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12.8V
- Voltage - Breakdown (Min):
- 14.3V
- Voltage - Clamping (Max) @ Ipp:
- 21.2V
- Current - Peak Pulse (10/1000µs):
- 28A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SM6T15CAY FAQ
1.How can I place an order for SM6T15CAY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T15CAY 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 SM6T15CAY reliable?
The price and inventory of SM6T15CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T15CAY is usually 5 days.
3.What payment methods are accepted for SM6T15CAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T15CAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T15CAY?
SM6T15CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T15CAY 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 SM6T15CAY?
For technical support, including SM6T15CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T15CAY requirements.
6.How does Aetrix verify that SM6T15CAY is sourced from the original manufacturer or authorized distributors?
All SM6T15CAY 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 SM6T15CAY meets industry standards.
7.What is the process for return or replacement of SM6T15CAY?
All SM6T15CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM6T15CAY, 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 SM6T15CAY part is unused and in its original packaging.
Return procedure for SM6T15CAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T15CAY Tags
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