Technological trends in the thermistor industry focus on temperature sensors and other evolving applications. While various systems and equipment are being made more functional, and microcomputers are being rapidly introduced, it is impossible to discuss such trends without considering sensors, which supply electric signals to the microcomputers. Of these sensors, the most popular ones are temperature sensors, particularly those made of thermistors.
Thermistors are used extensively in various products ranging from office automation equipment and air conditioners to other home appliances. At the same time, the quantity of thermistors used for temperature compensation for quartz oscillators, portable phones, carphones and transceivers is also expanding.
In the early days, thermistors were used mainly as sensors for thermometers and temperature controllers, for automatic gain control (AGC) circuits and time delay circuits for communication equipment. They also were used for amplitude of stability in oscillators, and disk thermistors for temperature compensation, though the number of thermistor applications was extremely limited compared with today.
Features of Shibaura Thermistors
Thermistors are devices with a large negative temperature coefficient of resistance, which varies noticeably with temperature. They are semiconductors of sintered ceramic material made of several metallic oxides, which are manganese, cobalt and nickel. These thermistors can be applied to temperature measurements and controls ranging from -50°C (-58°F) to 500°C (932°F).
Established in 1953, Shibaura Electronics Co., Ltd. has been the leading producer and supplier of thermistors in Japan. Shibaura thermistors are glass-sealed and referred to as PSB-type (Pellet Shaped Bead). They have received patents in eight countries, (Japan, USA, Canada, UK, Germany, France, Italy, and Switzerland).
Special features of PSB-type thermistors:
- High stability is due to its fine ceramic chip.
- Uniform shape and characteristics are attained through automated production.
- High heat resistivity and mechanical strength are obtained because of glass-seal.
- Fast response time is attained due to its small size.
- A solid product is formed by combining mass production with high quality.