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STMicroelectronics SM50T7V5AY
- Part No.:
- SM50T7V5AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM50T7V5AY.pdf
- Description:
- AUTOMOTIVE 5000 W, 6.5 V TVS IN
- Quantity:
- Payment:
- Shipping:
Inventory:2,960
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Product details
Overview
SM50T7V5AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMC package, designed for ISO 7637-2 pulse protection (Pulse 1, 2a, 3a, 3b) and ISO 10605 ESD suppression in 12 V vehicle systems. It features a 7.58 V minimum breakdown voltage (VBR), 11.2 V clamping voltage (VCL) at 447 A (10/1000 µs), and 175 °C maximum junction temperature - enabling robust surge protection in e-brake control modules and powertrain ECUs.
For engineers reviewing the SM50T7V5AY datasheet, SM50T7V5AY pinout, SM50T7V5AY application, or SM50T7V5AY equivalent, key selection criteria include its 7.5 V stand-off voltage (VRM), low 0.2 µA leakage at 25 °C, 5000 W peak pulse power (10/1000 µs), and compliance with IEC 61000-4-2 (±30 kV contact/air), ISO 10605 (±30 kV), and ISO 7637-2 transient immunity requirements.
Technical Context
This unidirectional TVS diode uses planar silicon technology to achieve stable high-temperature operation up to 175 °C and ultra-low leakage current (0.2 µA at 25 °C), critical for long-term reliability in automotive power electronics. Its dynamic resistance (RD) is 3.63 mΩ at 25 °C, ensuring minimal voltage overshoot during fast transients like load dump or inductive switching events.
The device meets stringent automotive standards including ISO 16750-2 (Test B), UL94 V0 flammability, J-STD-020 MSL Level 1, and JEDEC-registered SMC package outline. Its clamping behavior is characterized across temperature (αT = 10 × 10−4/°C) and pulse duration, supporting accurate system-level transient modeling for 12 V battery rail protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRM (Stand-off Voltage) | 7.5 V - Maximum continuous reverse operating voltage before significant conduction begins; sets threshold for clamping activation in 12 V automotive systems. |
| VBR (Min Breakdown) | 7.58 V at 1 mA - Ensures reliable triggering above nominal battery voltage while avoiding false trips during cranking transients. |
| VCL (Clamping, 10/1000 µs) | 11.2 V at 447 A - Limits voltage seen by downstream ICs (e.g., MCU power rails) during ISO 7637-2 Pulse 1 (−150 V) and Pulse 3a (−220 V). |
| PPP (Peak Power) | 5000 W (10/1000 µs) - Sustains high-energy surges without failure; derates to ~3200 W at Tj = 125 °C per Figure 3. |
| IPP (Peak Current) | 447 A (10/1000 µs) - Supports protection against worst-case load dump and alternator-induced transients in engine control units. |
| RD (Dynamic Resistance) | 3.63 mΩ - Low impedance minimizes clamping voltage rise under high di/dt, improving protection margin for sensitive 5 V or 3.3 V logic supplies. |
| Tj max | 175 °C - Enables placement near hot components (e.g., power MOSFETs, DC-DC converters) without thermal derating concerns. |
Pinout & Package
SM50T7V5AY is housed in a JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads and IPC-7531-compliant footprint. The two-terminal device has no polarity marking on the cathode bar in unidirectional variants (per Table 6: marking "EALY"); cathode is identified by the banded end of the SMC body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to chassis or system ground; forms low-impedance path for surge current return during clamping. |
| Cathode | Protected line terminal | Connected to protected 12 V supply rail; blocks reverse current until VBR exceeded, then shunts surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood applications with full temperature cycling, humidity, and mechanical stress testing per AEC standard. |
| Low leakage current | 0.2 µA at 25 °C and VRM - Prevents battery drain in always-on modules (e.g., body control units) over 15+ year service life. |
| High-temperature operation | Rated to 175 °C junction temperature - eliminates need for thermal derating in engine compartment placements near power electronics. |
| ISO 7637-2 compliance | Validated against Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) - covers all major automotive transient threats. |
| ESD robustness | ±30 kV contact/air discharge per IEC 61000-4-2 and ISO 10605 - protects CAN/LIN transceivers and sensor interfaces from human-body-model events. |
Applications
| Engine Control Unit (ECU) | Electronic Brake System (e-Brake) |
|---|---|
|
Use Scenario: Protecting 12 V power input to MCU and driver ICs against load dump and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed at main power entry point to clamp surges before they reach LDOs and microcontrollers. Use Value: Clamps to 11.2 V during 447 A pulses, preserving 5 V/3.3 V regulator input headroom and preventing brownout resets. |
Use Scenario: Safeguarding solenoid driver circuits and position sensor supplies in brake-by-wire systems. IC Role / Device Role / Timing Role: Primary transient suppressor on 12 V actuator rail, coordinated with secondary TVS on signal lines. Use Value: Withstands ISO 7637-2 Pulse 1 (−150 V) and Pulse 3a (−220 V) without degradation, ensuring fail-safe braking function integrity. |
| Body Control Module (BCM) | Infotainment Power Supply |
|
Use Scenario: Securing always-on 12 V inputs powering CAN transceivers and wake-up circuitry in low-power sleep modes. IC Role / Device Role / Timing Role: Standby protection element with sub-µA leakage, maintaining battery life over extended parking periods. Use Value: 0.2 µA leakage at 25 °C ensures <10 µA total standby current contribution, meeting OEM <50 µA BCM sleep budget. |
Use Scenario: Shielding DC-DC converter inputs from ignition-switching spikes and jump-start surges. IC Role / Device Role / Timing Role: Front-end surge limiter upstream of buck controller, reducing stress on input capacitors and FETs. Use Value: 5000 W peak power rating absorbs 100 ms load dump energy without thermal runaway, extending converter lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5A | Lower peak power (400 W), higher VCL (12.5 V at 24.3 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 consumer-grade 12 V systems with lower surge exposure. |
| TPSMB7.5A | Same SMC package, AEC-Q101 qualified, but VBR min = 7.1 V and VCL = 12.9 V at 388 A (10/1000 µs). | Higher clamping voltage reduces protection margin for 5 V logic; lower IPP limits energy handling. | Acceptable for less demanding automotive subsystems where 12.9 V clamping is tolerable and peak currents stay below 388 A. |
Compared with SMAJ7.5A and TPSMB7.5A, SM50T7V5AY delivers superior automotive-grade surge immunity via its 5000 W rating, tighter 7.58–8.0 V VBR window, and lower 11.2 V clamping - directly enabling compliance with ISO 16750-2 Test B and e-brake functional safety requirements.
Availability
SM50T7V5AY is available at Aetrix Electronics and suitable for automotive powertrain control, electronic braking systems, and body electronics requiring stable component supply with AEC-Q101 assurance, high-temperature reliability, and ISO 7637-2 transient immunity.
Supply support for SM50T7V5AY 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.
SM50T7V5AY belongs to the SM50TY series - a family of high-power automotive TVS diodes engineered specifically for ISO 7637-2 and ISO 10605 compliance in 12 V vehicle architectures, emphasizing planar technology for low leakage and high-Tj stability.
FAQ
What is the maximum clamping voltage of SM50T7V5AY under ISO 7637-2 Pulse 1 conditions?
The SM50T7V5AY clamps to 11.2 V at 447 A for a 10/1000 µs waveform, which directly covers ISO 7637-2 Pulse 1 (−150 V) when applied to a 12 V system with typical source impedance. This value is measured at Tj = 25 °C and remains within 12.1 V at Tj = 125 °C using the αT coefficient of 10 × 10−4/°C.
Can SM50T7V5AY be used in bidirectional configurations?
No - SM50T7V5AY is a unidirectional TVS diode, indicated by the "AY" suffix and absence of cathode bar differentiation in marking (Table 6). For bidirectional protection, ST offers the SM50T7V5CAY variant, which provides symmetrical clamping for AC-coupled or floating signal lines, but requires different PCB layout and grounding strategy.
How does the 175 °C junction temperature rating impact PCB layout?
The 175 °C Tj max allows placement adjacent to high-power components (e.g., motor drivers, DC-DC inductors) without thermal derating, provided the recommended SMC footprint (Figure 24) with ≥3.14 mm² copper area per lead is used. Thermal resistance drops from 120 °C/W (minimal copper) to ~40 °C/W with full thermal pad, enabling sustained operation in under-hood environments.
Is SM50T7V5AY compatible with lead-free reflow processes?
Yes - it is qualified for lead-free soldering per J-STD-020 MSL Level 1, with a peak reflow temperature of 240–245 °C (Figure 31). The matte tin plating and JEDEC-registered SMC outline ensure reliable wetting and coplanarity. ST recommends minimizing air convection in reflow ovens to prevent component movement during solder paste reflow.
SM50T7V5AY 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):
- 6.5V (Max)
- Voltage - Breakdown (Min):
- 7.2V
- Voltage - Clamping (Max) @ Ipp:
- 11.2V
- Current - Peak Pulse (10/1000µs):
- 447A
- 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
SM50T7V5AY FAQ
1.How can I place an order for SM50T7V5AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM50T7V5AY 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 SM50T7V5AY reliable?
The price and inventory of SM50T7V5AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM50T7V5AY is usually 5 days.
3.What payment methods are accepted for SM50T7V5AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM50T7V5AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM50T7V5AY?
SM50T7V5AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM50T7V5AY 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 SM50T7V5AY?
For technical support, including SM50T7V5AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM50T7V5AY requirements.
6.How does Aetrix verify that SM50T7V5AY is sourced from the original manufacturer or authorized distributors?
All SM50T7V5AY 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 SM50T7V5AY meets industry standards.
7.What is the process for return or replacement of SM50T7V5AY?
All SM50T7V5AY units undergo pre-shipment inspection (PSI). If there is an issue with SM50T7V5AY, 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 SM50T7V5AY part is unused and in its original packaging.
Return procedure for SM50T7V5AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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