onsemi NCT51SN115T1

The NCT51 and NCT52 are SOT–23 temperature switches that require no external components and the design is facilitated with factory–programmed temperature thresholds. A choice of factory–trimmed temperature trip points are available. Pin selectable hysteresis of +2°C or +10°C allows flexibility to the design. These parts typically consume only 17 μA of current and operate over the entire -55°C to +125°C temperature range while offering accuracies of ± 0.5°C (typ) and ±4°C (max). The NCT51 has an open drain, active low output, meant for microprocessor reset control. The NCT52 has a CMOS, active high output designed to drive a logic level MOSFET to turn on a fan or heater element. The NCT51/NCT52 are aimed for hot–temperature monitoring (+45°C to +115°C). These devices assert a logic signal when the temperature goes above the threshold. The NCT51 and NCT52 are offered in three standard temperature thresholds. Available in 5–Pin SOT–23A packages, these parts are ideal for applications requiring high integration, small size, low power and low installed cost. The NCT51 and NCT52 integrate a temperature sensor with a factory–programmed threshold switch. A logic signal is asserted when the die temperature crosses the factory programmed threshold. An external hysteresis input pin allows the user to select either 2°C or 10°C hysteresis to give further flexibility to the design of the application. The NCT51 and NCT52 are intended for a temperature range from 45°C to 115°C in a 10°C increment. The NCT51 has an open drain output and the NCT52 has a push/pull output stage. The NCT51 is intended for applications with a microprocessor reset input. The NCT52 is intended for applications of turning on a fan or heater element.

• 5–Pin SOT–23A
• Factory–Programmed Thresholds from +45°C to +115°C in 10°C Increments
• Pin–Selectable +2°C or +10°C Hysteresis
• ± 0.5°C (Typ) Threshold Accuracy Over Full Temperature Range
• No External Components Required
• 17 μA Supply Current

• Thermal Management in PCs and Servers
• Over Temperature Fail Safe Circuits
• Simple Fan Controller
• Temperature Alarms
• Projectors/Printers
• Notebook Computers
• Network Boxes