Those are the thermistors that come in a Tape & Reel (TR). Temperatures below 170°C can be reliably used with NTC thermometers. In order to ensure reliability, NTC thermistors should operate at -55°C as low as possible. A maximum current of 6.6A can be applied to the NTC thermistors without causing too much damage to the fuse element.
B57234S479M51 Features
Package/Case: Tape & Reel (TR) 4.7Ohm Resistance Current Rating of 6.6A 20% Tolerance
B57234S479M51 Applications
There are a lot of TDK Corporation B57234S479M51 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)