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STMicroelectronics SM6T24AY
- Part No.:
- SM6T24AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T24AY.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:6,486
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Product details
Overview
SM6T24AY from STMicroelectronics is a unidirectional automotive-grade transient voltage suppression (TVS) diode in SMB package, designed for ISO 7637-2 pulse protection in 12 V vehicle systems. It features a 24 V standoff voltage (VRM), 33.2 V clamping voltage at 1 A (VCL), 600 W peak pulse power (10/1000 µs), and AEC-Q101 qualification - deployed in engine control units to suppress load dump and inductive switching transients.
For engineers reviewing the SM6T24AY datasheet, SM6T24AY pinout, SM6T24AY application, or SM6T24AY equivalent, key selection criteria include clamping voltage under 1 A surge, junction temperature derating above 25 °C, low leakage (<1 µA at 85 °C), compliance with ISO 10605 ±30 kV ESD, and SMB footprint compatibility with IPC7531 layout guidelines.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown behavior across -55 °C to +150 °C junction temperature range, with temperature coefficient αT = 9.4 × 10⁻⁴ /°C enabling accurate VBR and VCL extrapolation beyond 25 °C. Its unidirectional configuration provides forward conduction path only during negative transients, making it suitable for battery-line protection where polarity is fixed.
The device meets IEC 61000-4-4 level 4 (4 kV fast transient burst) and exceeds ISO 10605 requirements for both air and contact discharge (±30 kV at C = 150 pF/R = 330 Ω and C = 330 pF/R = 330 Ω). Dynamic resistance RD = 0.444 Ω ensures low clamping rise under high-current pulses such as ISO 7637-2 Pulse 1 (-150 V) and Pulse 3a (-220 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 24 V - Maximum continuous reverse operating voltage before significant leakage; sets minimum system operating margin. |
| Breakdown Voltage (VBR) | 22.8 V min / 25.2 V max at 1 mA - Defines onset of avalanche conduction; tight tolerance enables predictable turn-on timing. |
| Clamping Voltage (VCL) | 33.2 V at 1 A (10/1000 µs) - Peak voltage seen by protected circuit during surge; directly limits stress on downstream ICs. |
| Peak Pulse Power | 600 W (10/1000 µs) - Sustains energy dissipation without failure under standardized automotive surge waveforms. |
| 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 vehicle modules. |
| Junction Temp Range | -55 °C to +150 °C - Supports operation in under-hood environments including engine compartments and transmission control units. |
| Dynamic Resistance (RD) | 0.444 Ω - Low impedance during clamping reduces voltage overshoot and improves surge current handling linearity. |
Pinout & Package
SM6T24AY is housed in an SMB (DO-214AA) surface-mount package with two terminals: Cathode (marked band) and Anode. The package complies with JEDEC registered outline and IPC7531 footprint standards, featuring matte tin-plated leads rated for 260 °C soldering (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line (e.g., battery rail); conducts avalanche current to ground during overvoltage events. |
| Anode | Reference/ground return | Typically tied to chassis or system ground; completes current path during transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use across temperature, humidity, vibration, and lifetime reliability per JESD22-A108. |
| Low dynamic resistance | 0.444 Ω enables tighter clamping and reduced voltage overshoot during 10/1000 µs surges up to 1 A. |
| High-temperature stability | Operates reliably at Tj = 150 °C with <1 µA leakage - critical for under-hood ECUs exposed to thermal cycling. |
| ISO 7637-2 compliance | Withstands Pulse 1 (-150 V), Pulse 2a (+112 V), Pulse 3a (-220 V), and Pulse 3b (+150 V) without degradation. |
| ESD robustness | Exceeds ISO 10605 ±30 kV (air/contact) and IEC 61000-4-2 level 4 - protects CAN/LIN interfaces from human-body-model discharges. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protection of 12 V supply rail against load dump and alternator-induced transients during ignition cycling. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps transients to ≤33.2 V, preventing damage to 36 V-rated power management ICs while maintaining <0.2 µA leakage at ambient. |
Use Scenario: Surge suppression on LIN bus lines exposed to ESD during door module actuation and sensor connection. IC Role / Device Role / Timing Role: Line-side TVS on LIN transceiver VCC and data pins, referenced to local ground plane. Use Value: Limits ESD-induced voltage to <33.2 V within 1 ns response time, preserving signal integrity and avoiding false wake-up events. |
| Infotainment Head Unit | Advanced Driver Assistance System (ADAS) Camera Module |
|
Use Scenario: Input protection for USB-C and HDMI power rails subjected to hot-plug and cable-induced surges. IC Role / Device Role / Timing Role: Primary TVS on 5 V/12 V auxiliary power inputs feeding PMIC and display drivers. Use Value: Absorbs 600 W (10/1000 µs) without thermal runaway, ensuring uninterrupted operation during vehicle start-stop cycles. |
Use Scenario: Front-end protection of image sensor power supply against ignition noise and electrostatic coupling from lens housing. IC Role / Device Role / Timing Role: TVS on 3.3 V analog supply rail upstream of LDO regulator feeding CIS sensor core. Use Value: Maintains <1 µA leakage at 85 °C ambient, minimizing offset drift in precision analog front-end while clamping to 33.2 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Same SMB package, but lower peak power (400 W), higher VCL (38.9 V at 1 A), and no AEC-Q101 qualification. | Limited to non-automotive industrial applications; unsuitable for ISO 7637-2 Pulse 1 or automotive ECU deployment. | Select when cost sensitivity outweighs automotive compliance and clamping performance. |
| 1.5SMC24A | Higher power rating (1500 W), larger SMC package (DO-214AB), VCL = 36.5 V at 1 A, AEC-Q101 not claimed. | Requires PCB area increase (~30% larger footprint); used where surge energy exceeds 600 W but automotive qualification is secondary. | Choose for heavy-duty commercial vehicle systems needing higher energy absorption without AEC-Q101 mandate. |
Compared with SMAJ24A and 1.5SMC24A, SM6T24AY uniquely balances AEC-Q101 compliance, SMB footprint, 600 W capability, and 33.2 V clamping - making it optimal for space-constrained automotive modules requiring certified reliability and precise voltage limiting.
Availability
SM6T24AY is available at Aetrix Electronics and suitable for engine control units, body control modules, infotainment head units, and ADAS camera modules requiring stable component supply across automotive production lifecycles.
Supply support for SM6T24AY 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 capabilities.
The SM6TY series belongs to ST's automotive-grade Transil™ TVS portfolio, engineered specifically for ISO 7637-2 and ISO 10605 compliance in harsh-temperature vehicle subsystems.
FAQ
What is the maximum clamping voltage of SM6T24AY under a 10/1000 µs surge?
The clamping voltage (VCL) is 33.2 V at 1 A peak pulse current for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature due to αT = 9.4 × 10⁻⁴ /°C, reaching ~35.1 V at Tj = 125 °C.
Does SM6T24AY meet AEC-Q101 requirements for automotive use?
Yes - SM6T24AY is explicitly AEC-Q101 qualified per the datasheet DS6905 Rev 11, covering temperature cycling, high-temperature operating life, and mechanical shock testing required for under-hood and chassis-mounted electronics.
Can SM6T24AY be used in bidirectional configurations?
No - SM6T24AY is unidirectional only. Bidirectional variants are marked with "CAY" suffix (e.g., SM6T24CAY) and feature symmetrical breakdown in both polarities, whereas SM6T24AY conducts only in reverse bias.
What is the recommended PCB footprint for SM6T24AY?
The SMB package requires the IPC7531-compliant footprint: pad length 2.60 mm (0.102 in), pad width 1.62 mm (0.064 in), center-to-center spacing 5.84 mm (0.230 in), and copper area ≥2.18 cm² per lead to maintain Rth(j-a) ≤ 4.5 °C/W per Figure 12.
SM6T24AY 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):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 33.2V
- Current - Peak Pulse (10/1000µs):
- 18A
- 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
SM6T24AY FAQ
1.How can I place an order for SM6T24AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T24AY 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 SM6T24AY reliable?
The price and inventory of SM6T24AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T24AY is usually 5 days.
3.What payment methods are accepted for SM6T24AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T24AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T24AY?
SM6T24AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T24AY 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 SM6T24AY?
For technical support, including SM6T24AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T24AY requirements.
6.How does Aetrix verify that SM6T24AY is sourced from the original manufacturer or authorized distributors?
All SM6T24AY 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 SM6T24AY meets industry standards.
7.What is the process for return or replacement of SM6T24AY?
All SM6T24AY units undergo pre-shipment inspection (PSI). If there is an issue with SM6T24AY, 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 SM6T24AY part is unused and in its original packaging.
Return procedure for SM6T24AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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