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STMicroelectronics SMA6T15CAY
- Part No.:
- SMA6T15CAY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6T15CAY.pdf
- Description:
- TVS DIODE 12.8VWM 27.2VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,569
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Product details
Overview
SMA6T15CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppression (TVS) diode in SMA package, designed for ISO 7637-2 pulse protection and ISO 10605 ESD immunity in 12 V/24 V vehicle systems. It delivers 600 W (10/1000 µs) peak pulse power, 15.0 V nominal breakdown voltage (VBR), and clamps to 21.2 V at 28 A, with leakage current ≤0.2 µA at 25 °C and Tj max = 150 °C.
For engineers reviewing the SMA6T15CAY datasheet, SMA6T15CAY pinout, SMA6T15CAY application, or SMA6T15CAY equivalent, key selection criteria include unidirectional vs. bidirectional polarity, clamping voltage under 28 A surge, dynamic resistance (0.193 Ω), junction temperature derating, and compliance with ISO 7637-2 Pulse 1/2a/3a/3b and IEC 61000-4-4 Level 4.
Technical Context
This bidirectional TVS diode uses planar silicon technology to achieve low leakage and high thermal stability across -55 °C to +150 °C junction temperature range. Its symmetrical I-V curve enables protection against both positive and negative transients without polarity constraints.
Clamping performance is defined by VCL = VBR(max) + RD × IPP, where RD = 0.193 Ω at 10/1000 µs, enabling precise overvoltage limiting in CAN, LIN, and sensor supply lines. It meets AEC-Q101 qualification and passes JESD22-B102 E3 solderability testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VBR | 15.0 V (min 14.3 V, max 15.8 V @ 1 mA); defines threshold where device transitions from high-impedance to clamping state |
| Clamping Voltage VCL | 21.2 V @ 28 A (10/1000 µs); maximum voltage seen by protected circuit during rated surge |
| Peak Pulse Power | 600 W (10/1000 µs); sustains 28 A surge without failure under standard automotive test waveform |
| Leakage Current IR | ≤0.2 µA @ 12.8 V, 25 °C; ensures minimal power loss and signal integrity in always-on automotive modules |
| Dynamic Resistance RD | 0.193 Ω; determines voltage rise per ampere of surge current beyond VBR |
| Junction Temperature Range | -55 °C to +150 °C; supports operation in engine bay, transmission control, and ADAS ECUs |
| ESD Withstand | ±30 kV (air/contact discharge, C = 150 pF/R = 330 Ω); exceeds ISO 10605 Level 4 for robust handling and assembly |
Pinout & Package
The SMA6T15CAY is housed in a JEDEC DO-214AC (SMA) surface-mount package with two terminals: Cathode (K) and Anode (A). The package measures 4.80–5.35 mm × 2.25–2.90 mm × 2.25 mm height and features matte tin-plated leads compliant with J-STD-002 and RoHS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Transient return path (bidirectional) | Connects to ground or common reference; conducts during negative surges |
| Cathode (K) | Transient return path (bidirectional) | Connects to protected line; conducts during positive surges; symmetric with Anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test conditions including temperature cycling, HTRB, and mechanical shock |
| Bidirectional architecture | Protects both polarities without external polarity reversal; simplifies PCB layout in dual-rail or floating systems |
| Low dynamic resistance (0.193 Ω) | Minimizes clamping voltage overshoot during fast 8/20 µs surges (e.g., ISO 7637-2 Pulse 3b) |
| 150 °C max junction temperature | Enables placement near heat sources (e.g., power converters) without derating in engine compartment applications |
| JEDEC DO-214AC footprint | Ensures compatibility with standard SMA land patterns (IPC-7351B) and automated SMT assembly |
Applications
| Infotainment Power Rail Protection | CAN FD Transceiver Interface |
|---|---|
Use Scenario: Protecting 12 V supply input to head unit MCU and display driver ICs against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed between fuse output and DC-DC input capacitor to clamp transients before regulation. Use Value: Limits voltage to ≤21.2 V during 28 A surge, preventing latch-up or overvoltage damage to downstream LDOs and PMICs. | Use Scenario: Safeguarding CAN FD physical layer transceivers (e.g., TJA1044) against ESD and coupled noise on differential bus lines. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS connected across CANH–CANL to suppress ±30 kV ESD without distorting 5 Mbps data edges. Use Value: Maintains signal integrity with <1 pF junction capacitance at 0 V bias while meeting ISO 11898-2 EMC requirements. |
| Body Control Module (BCM) Sensor Inputs | ADAS Camera Power Input |
Use Scenario: Shielding analog sensor inputs (e.g., ambient light, rain sensor) from battery line transients in door modules and pillar ECUs. IC Role / Device Role / Timing Role: TVS placed at connector entry point, upstream of RC filter and op-amp front-end, to shunt energy before signal conditioning. Use Value: Delivers <0.2 µA leakage at 12.8 V reverse bias, preserving ADC accuracy and minimizing offset drift over temperature. | Use Scenario: Securing 5 V/3.3 V camera module power rail against ignition-induced spikes and hot-swap events in rear-view or surround-view systems. IC Role / Device Role / Timing Role: Secondary TVS after primary fuse and LC filter, providing final-stage clamping before image sensor and ISP power pins. Use Value: Survives repeated ISO 7637-2 Pulse 1 (-150 V) and Pulse 3a (-220 V) events without parameter shift or degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6T15AY | Unidirectional; VBR same (15.0 V), but only clamps positive transients; lower leakage (0.2 µA vs. 1 µA at 85 °C) | Requires explicit polarity assignment; unsuitable for floating or AC-coupled lines | Select when protecting single-polarity rails (e.g., 12 V battery feed) and lowest possible leakage is critical |
| SMCJ15CA | Higher power rating (1500 W), larger SMC package (DO-214AB); VCL = 24.4 V @ 61.5 A; RD = 0.22 Ω | Used where higher surge margin is needed (e.g., alternator output), but requires more PCB area | Choose for under-hood power distribution nodes needing >600 W capability and proven field reliability in heavy-duty trucks |
Compared with SMA6T15AY and SMCJ15CA, SMA6T15CAY uniquely balances bidirectional protection, compact SMA footprint, and AEC-Q101 qualification - making it optimal for space-constrained, polarity-agnostic automotive signal and power lines where 600 W surge capacity suffices.
Availability
SMA6T15CAY is available at Aetrix Electronics and suitable for infotainment power rail protection, CAN FD transceiver interface, and body control module sensor inputs requiring stable component supply across automotive production lifecycles.
Supply support for SMA6T15CAY 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 SMA6TY series belongs to ST's automotive-qualified Transil™ TVS portfolio, engineered specifically for robust electromagnetic compatibility in 12 V/24 V vehicle networks subject to ISO 7637-2 and ISO 10605 stress profiles.
FAQ
What does the "CAY" suffix indicate in SMA6T15CAY?
The "CAY" suffix denotes a bidirectional TVS diode in SMA package with automotive grade (A) and RoHS-compliant matte tin plating (Y). "C" explicitly identifies the bidirectional configuration, distinguishing it from unidirectional "AY" variants like SMA6T15AY.
How does SMA6T15CAY perform under ISO 7637-2 Pulse 3a (-220 V)?
SMA6T15CAY clamps ISO 7637-2 Pulse 3a (−220 V, 50 Ω source) to ≤21.2 V at 28 A, limiting energy dissipation to within its 600 W rating. Its 150 °C junction rating ensures no thermal runaway occurs during repetitive pulses when mounted on IPC-7351B-compliant copper pads.
Can SMA6T15CAY replace SMA6T15AY in an existing design?
No - SMA6T15CAY is bidirectional while SMA6T15AY is unidirectional. Substitution requires verifying circuit polarity tolerance: SMA6T15CAY may conduct during normal reverse-bias operation, potentially disrupting bias networks or causing unexpected current paths in unidirectional topologies.
What is the recommended PCB footprint for SMA6T15CAY?
ST specifies a 5.43 mm × 1.40 mm pad length with 1.64 mm pad width and 2.63 mm center-to-center spacing (per Figure 18, DS6931 Rev 9). This matches IPC-7351B SMA generic outline and ensures reliable reflow soldering and mechanical strength for automotive vibration environments.
SMA6T15CAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMA6TY, 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:
- 27.2V
- Current - Peak Pulse (10/1000µs):
- 147A (8/20µs)
- Power - Peak Pulse:
- 600W
- 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:
- DO-214AC (SMA)
SMA6T15CAY FAQ
1.How can I place an order for SMA6T15CAY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6T15CAY 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 SMA6T15CAY reliable?
The price and inventory of SMA6T15CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6T15CAY is usually 5 days.
3.What payment methods are accepted for SMA6T15CAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6T15CAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6T15CAY?
SMA6T15CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6T15CAY 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 SMA6T15CAY?
For technical support, including SMA6T15CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6T15CAY requirements.
6.How does Aetrix verify that SMA6T15CAY is sourced from the original manufacturer or authorized distributors?
All SMA6T15CAY 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 SMA6T15CAY meets industry standards.
7.What is the process for return or replacement of SMA6T15CAY?
All SMA6T15CAY units undergo pre-shipment inspection (PSI). If there is an issue with SMA6T15CAY, 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 SMA6T15CAY part is unused and in its original packaging.
Return procedure for SMA6T15CAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6T15CAY Tags
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