W-FT consists of multiple thermistors on a single chip

High resolution can be obtained across wide temperature zones by mounting both high and low resistance thermistors in one chip.
Accurate temprature sensing within wide temprature range is possible by monitoring both high and low resistance thermistors on one chip.

R-FT consists of one thermistor and a thin-film resistor
on a single chip.

Thermistor curves can be linearized by incorporating the thermistor and its compensating resistor in a hybrid assembly. This simplifies handling in manufacture, and increases reliability.