Overview
The SM4T21AY is a high-performance Transient Voltage Suppressor (TVS) diode designed by STMicroelectronics. This component is part of the SM4TxxAY series, which is specifically engineered to protect sensitive automotive circuits against electrical surges and electrostatic discharges. The SM4T21AY is AEC-Q101 qualified, ensuring it meets the stringent requirements for automotive applications. It features a peak pulse power dissipation of 400 W (10/1000 μs) and 2.3 kW (8/20 μs), making it robust against various transient conditions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Peak Pulse Power Dissipation | 400 W (10/1000 μs), 2.3 kW (8/20 μs) | W, kW |
| Stand-off Voltage (VRM) | 18 V | V |
| Breakdown Voltage (VBR) at 25°C | 20.0 V | V |
| Clamping Voltage (VCL) at 25°C | 29.2 V | V |
| Leakage Current (IRM) at 25°C | 0.2 µA | µA |
| Operating Junction Temperature Range | -55 to +150 °C | °C |
| Maximum Lead Temperature for Soldering | 260 °C (for 10 s) | °C |
| Package Type | SMA | - |
| Compliance Standards | ISO 10605, ISO 7637-2, AEC-Q101 | - |
Key Features
- High Peak Pulse Power Dissipation: Capable of handling 400 W (10/1000 μs) and 2.3 kW (8/20 μs) to protect against severe transient conditions.
- Low Leakage Current: Ensures minimal current leakage of 0.2 µA at 25°C, contributing to long-term reliability and stability.
- High Junction Temperature: Operates up to a junction temperature of 150°C, making it suitable for high-end automotive circuits.
- Compliance with Automotive Standards: Meets ISO 10605 and ISO 7637-2 standards, and is AEC-Q101 qualified.
- Planar Technology: Enhances performance and reliability in high-end circuits.
- ECOPACK Packaging: Available in environmentally compliant ECOPACK packages.
Applications
The SM4T21AY is designed for use in automotive electronics to protect sensitive circuits from electrical surges and electrostatic discharges. It is particularly suitable for applications such as:
- Automotive control units and sensors.
- Infotainment systems.
- Powertrain and engine control systems.
- Advanced driver-assistance systems (ADAS).
Q & A
- What is the peak pulse power dissipation of the SM4T21AY?
The SM4T21AY can handle a peak pulse power dissipation of 400 W (10/1000 μs) and 2.3 kW (8/20 μs).
- What is the stand-off voltage (VRM) of the SM4T21AY?
The stand-off voltage (VRM) of the SM4T21AY is 18 V.
- What are the compliance standards for the SM4T21AY?
The SM4T21AY complies with ISO 10605, ISO 7637-2, and is AEC-Q101 qualified.
- What is the maximum operating junction temperature of the SM4T21AY?
The maximum operating junction temperature is 150°C.
- What is the package type of the SM4T21AY?
The SM4T21AY is packaged in an SMA footprint.
- What is the leakage current of the SM4T21AY at 25°C?
The leakage current at 25°C is 0.2 µA.
- Is the SM4T21AY suitable for high-end automotive circuits?
- What is the maximum lead temperature for soldering the SM4T21AY?
The maximum lead temperature for soldering is 260°C for 10 seconds.
- Does the SM4T21AY come in environmentally compliant packaging?
- What are some typical applications of the SM4T21AY?
