VISHAY AMETHERM NTC Thermistor 4 Ohm SL22 Series

The VISHAY AMETHERM SL22 4R014 is a 2-pin NTC (Negative Temperature Coefficient) thermistor designed as a highly effective inrush current limiter. Its primary function is to protect sensitive components within switching power supplies and other power devices from damaging current surges that occur during initial power-up.

This component from the SL22 series presents a high initial electrical resistance, which rapidly limits the inrush of current. As current begins to flow, the device quickly self-heats, causing its resistance to drop to a negligible level, allowing normal operation to proceed unimpeded. This intelligent behaviour safeguards circuits and extends the lifespan of connected equipment.

Engineered for robust performance, this inrush current limiter is suitable for use in circuits with voltages of up to 480VAC. Its construction and materials ensure reliable operation in demanding electronic environments.

Key Specifications & Features

• Product Range: SL22 Series
• Resistance at 25°C: 4 Ohm
• Tolerance: -20% to +20%
• Lead Type: Radial leaded for through-hole PCB mounting
• Maximum Steady State Current at 25°C: 14A
• Maximum Energy Rating at 25°C: 100J
• Thermal Time Constant: 94 seconds
• Dissipation Constant: 32.4mW/°C
• Approvals: CSA and UL recognised for safety standards
• Physical Size: Disc measures 22mm in diameter

Ideal for integration into power supply designs, motor controls, and any application requiring controlled power-up sequences, this NTC thermistor is a critical component for enhancing system reliability and preventing premature component failure.