B57236S0309M000

Overview

The B57236S0309M000 is a negative temperature coefficient (NTC) thermistor designed for inrush current limiting applications. It features a coated disk body with dimensions of 11.5 mm diameter and 6 mm thickness, mounted via tinned copper wire leads. The component operates within a temperature range of -55 °C to 170 °C. At 25 °C, it exhibits a nominal resistance of 3 Ω with a tolerance of ±20%. The maximum rated power dissipation is 2.1 W, and it supports series connections up to 265 VRMS. Key electrical parameters include a thermal time constant of 70 s.

Feature Summary

• Coated NTC thermistor disk construction for environmental protection
• Kinked tinned copper wire leads for through-hole mounting
• Capable of handling high initial surge currents during power-up
• Suitable for AC voltage ratings up to 265 VRMS

Applications

• Inrush current limiting in switching power supplies
• Protection of electronic circuits against startup surges
• General purpose industrial equipment power stages
• Consumer electronics power input stages

Procurement Notes

Verify the specific suffix M000 against the manufacturer's latest datasheet to confirm lead length and coating specifications. Ensure the application environment remains within the -55 °C to 170 °C operating range. Confirm that the steady-state current does not exceed the limits defined by the device's power dissipation rating at the expected ambient temperature.

Selection Notes

Select this component when a low resistance value is required to minimize steady-state power loss while providing effective surge suppression. The 3 Ω resistance and 2.1 W power rating suit moderate current applications. Consider the physical dimensions of the 11.5 mm disk and lead configuration for PCB layout constraints. Verify compatibility with the system's peak inrush current requirements.

Part Context

This part belongs to the B57236S0M0 series of leaded and coated NTC thermistors from EPCOS (TDK). The series is specifically engineered for inrush current limiting in various electronic devices. Similar parts in the series vary primarily by resistance value and specific mechanical tolerances, sharing the same fundamental coated disk architecture and mounting style.

Replacement Considerations

Direct substitutes must match the 3 Ω resistance, 2.1 W power rating, and 11.5 mm disk diameter. Verify that alternative components support the same 265 VRMS rating and operate within the specified -55 °C to 170 °C range. Ensure the replacement maintains equivalent thermal time constant characteristics for proper circuit timing.