Introduction of Thin-Film Platinum Resistance Thermometer Sensors
KOA 's lineup of SDT thin-film platinum resistance thermometer sensors consists of SDT101 series (cylindrical type with axial lead), SDT310 series (flat radial lead type: meet with JIS/IEC standard), and the SDT73 series (SMD type). KOA also offers ST series products that are assembled by incorporating SDT series resistors to a protecting tube. The outlines of each product are given below. The main ratings are shown in Table 1, and the resistance value and temperature characteristics, Figure 2.
Table1.Rating Table of SDT Series
Figure 2. Temperature Resistance Characteristics
SDT101 series is low in price compared with SDT310 series which are conformed with JIS. KOA has shipped them since 1982. The approximate expression of temperature resistance characteristics has been provided and it can be used for circuit calculation at designing. The element, which is columnar, has no directionality. They perform excellent as wind-velocity sensors or as flow sensors utilizing self-heating (Photo 1).
The SDT101 series are mainly used for the temperature compensation of load cells, wind-velocity sensors utilizing self-heating, the cold junction compensation of thermo-couples, the flow measurement of electronic fuel injector of automotives, and the compensation of each temperature sensor.
SDT310 series are small (3.0 x 2.0mm), and can generate resistance value of 1kΩ, with excellent response and linearity. The SDT310LT model among these series, allows external lead wire to be soldered easily. The SDT310MT realizes class B at temperature of 650C degrees, which could be measured only by thermo-couples or high-priced wire wound type. Main applications of SDT310 series are, high-precision measurement of temperature, the cold junction temperature compensation of thermo-couples, the temperature compensation of control boards, and the temperature control of electronic equipment.
Surface mount type platinum thin film thermal chip sensors, T.C.R. is conformed to JIS or IEC standards. SDT73V is conformed to AEC-Q200, automotive test standard.
Custom-product is compatible with wire bonding. Therefore, it is suitable for temperature compensation in high-precision sensor modules.
This type achieves the maximum operating temperature of 400C degrees, and available using even in high-temperature environment. Mainly used for the cold junction compensation of thermo-couples and the temperature compensation of optical communication modules.
ST series consists of customized products by e.x. enclosing SDT series resistors into protecting tube, or extending the lead wire or mounting on board. An example of the ST series is shown in Photo 2.
KOA Corporation will provide you compact, high-precision, and high-temperature products which are available for wide range of the measurement temperature. KOA will expand its product lineups to meet your requirements.