Those are the thermistors that come in a Bulk. It is included in DO-204AH, DO-35, Axial as a convenience. When using NTC thermistors, resistance tolerance is ±5%. In order to ensure reliable performance, NTC thermistors should be set to -40°C~150°C. There is a maximum power setting of 20mW set by the NTC thermistors.
USUG1000-303J Features
Package/Case: Bulk USUG Series Operating Temperature: -40°C~150°C Mounting Type: Through Hole
USUG1000-303J Applications
There are a lot of Littelfuse Inc. USUG1000-303J 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)