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STMicroelectronics SM6T12AY
- Part No.:
- SM6T12AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T12AY.pdf
- Description:
- TVS DIODE 10.2VWM 16.7VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,620
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Product details
Overview
SM6T12AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMB package, designed to clamp transient surges up to 16.7 A (10/1000 µs) with a clamping voltage of 16.7 V and stand-off voltage of 12 V. It delivers 600 W peak pulse power at 25 °C and sustains 515 W at 150 °C junction temperature, meeting ISO 7637-2 Pulse 1/2a/3a/3b and ISO 10605 ESD requirements for 12 V automotive power networks.
For engineers reviewing the SM6T12AY datasheet, SM6T12AY pinout, SM6T12AY application, or SM6T12AY equivalent, this device is selected for robust overvoltage protection in engine control units, body control modules, and infotainment power rails where low leakage (0.2 µA at 25 °C), high Tj max (150 °C), and stable clamping under thermal stress are critical.
Technical Context
This unidirectional TVS operates as a reverse-biased avalanche clamp, triggered when reverse voltage exceeds its 12 V nominal breakdown (VBR = 10.2–12.6 V). Its planar silicon construction ensures low dynamic resistance (RD = 0.114 Ω) and minimal capacitance (<100 pF at 1 V), preserving signal integrity in DC power lines.
The device complies with IEC 61000-4-4 Level 4 (4 kV), ISO 10605 (±30 kV contact/air), and ISO 7637-2 (Pulse 1: −150 V; Pulse 2a: +112 V; Pulse 3a: −220 V; Pulse 3b: +150 V), enabling direct integration into automotive subsystems without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 12 V - Maximum continuous reverse operating voltage before conduction begins. |
| Breakdown Voltage (VBR) | 10.2–12.6 V @ 1 mA - Confirmed avalanche onset range ensuring reliable triggering across temperature. |
| Clamping Voltage (VCL) | 16.7 V @ 36 A (8/20 µs) - Peak voltage seen by protected circuit during worst-case surge. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustained energy absorption capability at ambient; derates to 515 W at 150 °C. |
| Leakage Current (IRM) | 0.2 µA @ 12 V, 25 °C - Minimal standby power loss and negligible loading on 12 V supply rails. |
| Junction Temperature Range | −55 to +150 °C - Enables deployment in under-hood ECUs and transmission control units. |
| Dynamic Resistance (RD) | 0.114 Ω - Low impedance limits voltage overshoot during fast transients and improves clamping precision. |
Pinout & Package
SMB (DO-214AA) surface-mount package: 3.3–3.95 mm length × 5.1–5.6 mm width × 2.45 mm height; matte tin-plated leads compliant with J-STD-020 MSL Level 1 and IPC7531 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Surge Return Path | Connected to ground or low-impedance return; carries full transient current during clamping. |
| Anode | Protected Line Input | Connected to 12 V rail or signal line; reverse-biased during normal operation, avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use across temperature, humidity, and mechanical shock per JESD22 standards. |
| Low leakage at high temperature | 1 µA @ 12 V, 85 °C - Ensures stable biasing and no false triggering in hot under-hood environments. |
| High-temperature power derating | 515 W @ 150 °C junction - Maintains surge immunity in thermally constrained ECU layouts. |
| ISO 7637-2 compliance | Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), Pulse 3b (+150 V) - Covers all battery-line transients in 12 V systems. |
| ESD robustness | ±30 kV air/contact per ISO 10605 (C = 330 pF, R = 330 Ω) - Eliminates need for secondary ESD protection on power inputs. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protects 12 V power input of microcontroller-based ECU against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO input, clamping transients before they reach voltage regulators. Use Value: Prevents brownout-induced MCU resets and regulator latch-up during ISO 7637-2 Pulse 1 (−150 V) and Pulse 2a (+112 V). |
Use Scenario: Shields LIN bus power supply and window motor driver ICs from battery reversal and jump-start spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V distribution node feeding multiple low-power loads. Use Value: Limits voltage excursion to ≤16.7 V during 30 kV ESD events and −220 V Pulse 3a, avoiding MOSFET gate oxide damage. |
| Infotainment Power Supply | ADAS Camera Module |
|
Use Scenario: Guards USB-C PD controller and display backlight drivers from ignition-on surges and hot-swap transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 12 V input, upstream of buck converters and PMICs. Use Value: Clamps 8/20 µs surges to 21.7 V at 184 A, preventing overvoltage shutdown of audio SoCs and display timing controllers. |
Use Scenario: Secures 12 V input of image sensor power management IC in rear-view camera exposed to trunk lid ESD and vibration-induced arcing. IC Role / Device Role / Timing Role: Automotive-grade transient suppressor mounted directly at connector entry point. Use Value: Withstands repeated ±30 kV ESD strikes without parameter shift, ensuring uninterrupted video stream during vehicle door closure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | Lower PPP (400 W @ 10/1000 µs); higher VCL (20.1 V @ 30.1 A); same SMB package. | Limited to non-critical 12 V rails where 20.1 V clamping is acceptable. | Choose SMAJ12A only if thermal margin allows lower power rating and system tolerates higher clamping voltage. |
| 1.5SMC12A | Higher PPP (1500 W @ 10/1000 µs); larger SMC package (7.1 × 6.2 mm); VCL = 19.9 V @ 75.5 A. | Requires PCB area increase; suited for high-energy industrial 12 V systems, not space-constrained automotive modules. | Select 1.5SMC12A only when surge energy exceeds 600 W and board layout permits SMC footprint. |
Compared with SMAJ12A and 1.5SMC12A, SM6T12AY uniquely balances AEC-Q101 compliance, 600 W power handling, 16.7 V clamping, and SMB size-making it optimal for volume automotive electronics where reliability, thermal performance, and board space are jointly constrained.
Availability
SM6T12AY is available at Aetrix Electronics and suitable for engine control units, body control modules, and infotainment power supplies requiring stable component supply across automotive production lifecycles.
Supply support for SM6T12AY 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.
The SM6TY series belongs to ST's automotive-grade Transil™ TVS portfolio, engineered specifically for ISO 7637-2 and ISO 10605 compliance in 12 V vehicle electrical architectures.
FAQ
Is SM6T12AY bidirectional or unidirectional?
SM6T12AY is unidirectional. Its marking "DTY" (per Table 6) and electrical characteristics table confirm cathode-anode polarity with reverse-biased operation. Bidirectional variants in the same family carry "CAY" suffix (e.g., SM6T12CAY) and exhibit symmetric clamping in both directions.
What is the maximum clamping voltage at 100 A (8/20 µs)?
Per Figure 5 in DS6905 Rev 11, SM6T12AY clamps to approximately 24.5 V at 100 A (8/20 µs). This is derived from the device's RD = 0.114 Ω and VBR ≈ 12 V: VCL ≈ VBR + (RD × IPP) = 12 + (0.114 × 100) = 23.4 V, consistent with curve extrapolation.
Can SM6T12AY be used in 24 V truck systems?
No. SM6T12AY's 12 V stand-off voltage makes it unsuitable for 24 V nominal systems. For 24 V applications, ST recommends SM6T24AY (24 V VRM) or SM6T27AY (27 V VRM), which maintain appropriate margin above battery float voltage and comply with ISO 7637-2 Pulse 1 (−200 V) for commercial vehicles.
Does SM6T12AY require a heatsink for 600 W surge dissipation?
No heatsink is required for single-event 600 W (10/1000 µs) surges. The device relies on thermal mass and PCB copper area for transient energy absorption. Figure 12 shows Rth(j-a) drops to ~2.5 °C/W with 3 cm² copper per lead-adequate for short pulses without sustained heating.
SM6T12AY 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 10.2V
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 16.7V
- Current - Peak Pulse (10/1000µs):
- 36A
- 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
SM6T12AY FAQ
1.How can I place an order for SM6T12AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T12AY 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 SM6T12AY reliable?
The price and inventory of SM6T12AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T12AY is usually 5 days.
3.What payment methods are accepted for SM6T12AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T12AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T12AY?
SM6T12AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T12AY 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 SM6T12AY?
For technical support, including SM6T12AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T12AY requirements.
6.How does Aetrix verify that SM6T12AY is sourced from the original manufacturer or authorized distributors?
All SM6T12AY 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 SM6T12AY meets industry standards.
7.What is the process for return or replacement of SM6T12AY?
All SM6T12AY units undergo pre-shipment inspection (PSI). If there is an issue with SM6T12AY, 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 SM6T12AY part is unused and in its original packaging.
Return procedure for SM6T12AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T12AY Tags
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