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STMicroelectronics SM50T75AY
- Part No.:
- SM50T75AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM50T75AY.pdf
- Description:
- AUTOMOTIVE 5000 W, 64 V TVS IN S
- Quantity:
- Payment:
- Shipping:
Inventory:9,955
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Product details
Overview
SM50T75AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMC package, designed to clamp transient surges up to 5000 W (10/1000 µs) and 519 A peak pulse current while maintaining 103 V clamping voltage at 519 A. It features 74.8 V minimum breakdown voltage, 0.2 µA leakage at 25 °C, and operates up to 175 °C junction temperature - deployed in powertrain control units for ISO 7637-2 Pulse 1 and Pulse 3a surge suppression.
For engineers reviewing the SM50T75AY datasheet, SM50T75AY pinout, SM50T75AY application, or SM50T75AY equivalent, key selection criteria include clamping voltage vs. peak current performance, unidirectional polarity for battery-line protection, high-temperature reliability in under-hood environments, and compliance with ISO 10605 ±30 kV ESD and ISO 16750 load-dump immunity requirements.
Technical Context
This TVS diode uses planar silicon technology to achieve low leakage (0.2 µA) and stable VBR drift coefficient (αT = 10×10−4/°C), enabling predictable clamping across −55 °C to +175 °C operating range. Its dynamic resistance of 154 mΩ at 8/20 µs pulse ensures rapid voltage limiting during fast transients like ISO 10605 contact discharge.
The device meets IEC 61000-4-2 Level 4 (±30 kV air/contact), ISO 10605 (±30 kV), and ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V), making it suitable for 12 V automotive supply rail protection where long-term stability under thermal cycling is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 5000 W - sustains 150 V surge for 1 ms without failure in engine control modules |
| Clamping Voltage (VCL) | 103 V at 519 A - limits voltage seen by downstream MCU or CAN transceiver during load dump |
| Breakdown Voltage (VBR) | 74.8 V min at 1 mA - ensures reliable conduction above nominal 12 V rail but below 80 V system tolerance |
| Leakage Current (IR) | 0.2 µA at 25 °C - prevents parasitic drain in always-on vehicle networks (e.g., body control modules) |
| Junction Temperature Range | −55 °C to +175 °C - supports placement near engines or inverters without derating |
| Dynamic Resistance (RD) | 154 mΩ - determines voltage overshoot during 8/20 µs transients (e.g., ISO 10605 ESD) |
| ESD Withstand (IEC 61000-4-2) | ±30 kV contact/air - exceeds Level 4 for infotainment and ADAS interface ports |
Pinout & Package
SM50T75AY is housed in a JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads and MSL level 1 moisture sensitivity. The two-terminal configuration supports unidirectional operation: Cathode (marked with bar) connects to protected line; Anode connects to ground or battery return.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to chassis or power ground; establishes reference for clamping action |
| Cathode | Protected line terminal | Connected to 12 V supply rail or signal line; conducts surge current to ground when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, mechanical shock, and humidity testing per JESD22 standards |
| Planar silicon construction | Enables <0.2 µA leakage at 25 °C and stable VBR drift over lifetime in high-temperature under-hood locations |
| ISO 7637-2 Pulse 1/2a/3a/3b compliance | Clamps −150 V (Pulse 1), +112 V (Pulse 2a), −220 V (Pulse 3a), +150 V (Pulse 3b) transients on 12 V systems |
| UL94 V0 flammability rating | Ensures non-propagation of flame during fault conditions in enclosed ECUs |
| JEDEC SMC footprint compatibility | Matches IPC7531 recommended land pattern for reliable solder joint integrity and thermal dissipation |
Applications
| Powertrain Control Unit (PCU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protects microcontroller supply rail against load dump transients during alternator regulation faults in gasoline/diesel engine ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and LDO regulator input to clamp voltage spikes before they reach sensitive logic. Use Value: Limits VIN to ≤103 V during 150 ms load dump events, preventing LDO overvoltage shutdown and ensuring continuous MCU operation. |
Use Scenario: Shields LIN bus transceivers and door module MCUs from ESD events during service access or connector mating. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt ±30 kV ESD pulses (IEC 61000-4-2) to ground within nanoseconds. Use Value: Maintains <0.2 µA leakage to avoid battery drain in sleep mode while clamping ESD-induced transients below LIN physical layer damage threshold. |
| Advanced Driver Assistance Systems (ADAS) Camera ECU | Electric Power Steering (EPS) Control Unit |
|
Use Scenario: Guards image sensor power supply against ISO 7637-2 Pulse 3a (−220 V) induced by relay switching noise in front-end camera modules. IC Role / Device Role / Timing Role: Fast-response TVS placed upstream of DC-DC converter to suppress sub-microsecond transients before they couple into analog imaging circuitry. Use Value: Achieves 103 V clamping at 519 A with 154 mΩ RD, minimizing voltage overshoot that could cause pixel corruption or sensor reset. |
Use Scenario: Safeguards motor driver ICs and torque sensor interfaces from reverse battery connection and jump-start surges in EPS systems. IC Role / Device Role / Timing Role: Unidirectional TVS installed on 12 V input rail to absorb −150 V Pulse 1 energy and prevent gate oxide damage in MOSFET half-bridges. Use Value: Withstands 175 °C junction temperature, enabling direct mounting on EPS PCB near motor drivers without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A | Lower peak power (400 W), higher VCL (129 V at 31.1 A), SMC package but not AEC-Q101 qualified | Limited to non-automotive industrial use; insufficient for ISO 7637-2 Pulse 1 or load dump | Select only for cost-sensitive non-automotive 12 V systems with lower surge exposure |
| TPSMD75A | Same 75 V VBR, 5000 W rating, but 112 V VCL at 44.6 A and no ISO 10605 ±30 kV validation | Meets basic IEC 61000-4-2 Level 3 (±8 kV contact), not certified for automotive ESD robustness | Use where AEC-Q101 and full ISO 10605 compliance are not required, e.g., commercial-grade telematics |
Compared with SMAJ75A and TPSMD75A, SM50T75AY delivers superior automotive-grade assurance via AEC-Q101 qualification, verified ±30 kV ESD immunity, and validated ISO 7637-2 Pulse 1/3a performance - essential for safety-critical powertrain and ADAS applications where field reliability is non-negotiable.
Availability
SM50T75AY is available at Aetrix Electronics and suitable for automotive powertrain control units, body control modules, ADAS camera ECUs, and electric power steering systems requiring stable component supply across extended product lifecycles.
Supply support for SM50T75AY 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 SM50TxxAY series belongs to ST's automotive-grade transient voltage suppression portfolio, engineered specifically for ISO 7637-2 and ISO 10605 compliance in harsh-temperature vehicle subsystems - targeting long-term reliability in engine bays and ADAS domains.
FAQ
What is the maximum clamping voltage of SM50T75AY at 519 A?
The maximum clamping voltage (VCL) of SM50T75AY is 103 V at 519 A peak pulse current under 8/20 µs waveform conditions, measured at Tj = 25 °C. This value increases with junction temperature at a rate of 10×10−4/°C, reaching approximately 110 V at 175 °C.
Is SM50T75AY bidirectional or unidirectional?
SM50T75AY is a unidirectional TVS diode, indicated by the "AY" suffix and cathode bar marking on the SMC package. It conducts only when the cathode is positive relative to the anode, making it suitable for protecting positive supply rails against overvoltage transients.
Does SM50T75AY meet AEC-Q101 requirements?
Yes, SM50T75AY is fully AEC-Q101 qualified, having passed stress tests including temperature cycling, high-temperature operating life, unbiased highly accelerated stress test (uHAST), and mechanical shock - confirming suitability for automotive under-hood and chassis-mounted applications.
What is the recommended PCB footprint for SM50T75AY?
The recommended footprint follows IPC7531 guidelines for SMC packages: 5.11 mm × 3.14 mm pad length/width with 1.54 mm solder mask opening per end, matching JEDEC DO-214AB outline and enabling optimal thermal dissipation and reflow yield per ST's ECOPACK reflow profile.
SM50T75AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 64V (Max)
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 47A
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SM50T75AY FAQ
1.How can I place an order for SM50T75AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM50T75AY 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 SM50T75AY reliable?
The price and inventory of SM50T75AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM50T75AY is usually 5 days.
3.What payment methods are accepted for SM50T75AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM50T75AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM50T75AY?
SM50T75AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM50T75AY 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 SM50T75AY?
For technical support, including SM50T75AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM50T75AY requirements.
6.How does Aetrix verify that SM50T75AY is sourced from the original manufacturer or authorized distributors?
All SM50T75AY 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 SM50T75AY meets industry standards.
7.What is the process for return or replacement of SM50T75AY?
All SM50T75AY units undergo pre-shipment inspection (PSI). If there is an issue with SM50T75AY, 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 SM50T75AY part is unused and in its original packaging.
Return procedure for SM50T75AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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