Those are the thermistors that come in a Bulk. It is included in Bead, Epoxy as a convenience. When using NTC thermistors, resistance tolerance is ±10%. In order to ensure reliable performance, NTC thermistors should be set to 150°C.
DC222J2K Features
Package/Case: Bulk DC Series Operating Temperature: 150°C Mounting Type: Free Hanging
DC222J2K Applications
There are a lot of Littelfuse Inc. DC222J2K NTC Thermistors applications.
Temperature compensation for semiconductor devices
Temperature detection for CPU and memory device
Temperature compensation for ink-viscosity (Inkjet Printer)
Temperature detection of battery cells
Temperature compensation of display contrast
Temperature compensation of display backlighting (CCFL)