About QTI
Quality Thermistor, Inc. (QTI) was founded in 1977 to meet the increasing demand for high quality electronic components for the aerospace industry. Since then, QTI has exceeded the requirements of some of the most stringent high cost of failure applications, changing the landscape of the supply chain for the entire industry.
Today, QTI continues to maintain its leadership position for mission-critical applications as well as for medical and industrial applications by supplying the world’s top companies with innovative products and services. In fact, QTI developed the highest standard for surface mount thermistors with the introduction of qualified surface mount parts to MIL-PRF-32192; supplying design engineers with fully qualified DSCC options for two PTC and three NTC surface mount package styles. Additionally, QTI has partnered with the NASA Goddard Space Flight Center for surface mount thermistors qualified to S311-P827, an industry first!
In addition to QTI’s accomplishments, our ISO:09001:2000 and AS9100 certified manufacturing and testing facilities in Idaho and Mexico enhance our ability to meet the needs of today’s challenging temperature measurement and control applications.
What are Thermistors?
Thermistors (THERMally sensitive resistors), are solid state, electronic devices which detect thermal environmental changes for use in Temperature measurement, control and compensation circuitry. Quality Thermistor, Inc. manufacturers temperature sensors comprised of two basic thermistor technologies:
Negative Temperature Coefficient (NTC)
Negative Temperature Coefficient (NTC) thermistors exhibit a non-linear, decreasing electrical resistance with increasing environmental temperature. Correspondingly, NTC thermistors exhibit a non-linear increasing electrical resistance with decreasing environmental temperature. An NTC thermistors exponential and inverse Resistance / Temperature (R/T) characteristic delivers precise, repeatable thermal sensing with field interchangeable capability.
Positive Temperature Coefficient (PTC)
Positive Temperature Coefficient (PTC) thermistors exhibit a linear, increasing electrical resistance with increasing environmental temperature. Correspondingly, PTC thermistors exhibit a linear, decreasing electrical resistance with decreasing environmental temperature. PTC thermistors linear and proportional change in Resistance / Temperature (R/T) offers simplified and reliable thermal management.
