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NTC Thermistors

NTC thermistors are used for temperature control and monitoring. These thermistors are temperature sensitive resistors with a negative temperature coefficient (NTC) meaning as temperature increases, the electrical resistance across the sensor drops.

Applications: NTC thermistors applications vary widely. They are very small in size and can be nestled in to tight spaces common to modern electronic applications. They are also very reliable and are deployed as critical temperature monitors in industrial equipment. Thermistors can be used to regulate and maintain the temperature of a process, or as a safety device, notifying a system or operator of a critical over temperature condition.

Elements: NTC thermistors can be deployed with common lead wires and are typically less expensive than thermocouples which require expensive lead wires of dissimilar metals. Thermistors are built of common semiconductor material and are typically less expensive than RTD sensors which require platinum sensing elements.

Accuracy: NTC thermistors are used as highly accurate temperature sensors. Our NTC thermistors are 100% tested during sensor chip manufacturing and after final probe assembly to ensure quality and reliability in the field. Selco has the ability to build and keep 2-3 releases of material for customers to accommodate blanket orders, kanban programs and quick shipping.

Series Info:

IN series: This is an interchangeable epoxy encapsulated discrete thermistor with un-insulated leads that can be mounted on a board or packaged in a probe assembly where operating temperatures run from -50 °C to 150 °C. The bead diameter is 0.095”.

PM series: This is a point matched epoxy encapsulated thermistor with uninsulated leads that is tolerance based and can be PCB mounted or packaged in a probe assembly with operating temperatures from -50 °C to 150 °C. The bead diameter is 0.095”.

DT series: These are DO-35 thermistors with uninsulated axial leads that are often packaged in probe assemblies with operating temperatures from -50 degrees C to 250 or even 300 degrees C. These thermistors can be interchangeable or tolerance based. The bead diameter is 0.079”.

RG series: This thermistor is a radial glass bead thermistor without insulated leads that is normally packaged in a probe assembly, is tolerance based, and has an operating temperature from -50 °C to 300 °C. The bead diameter is 0.063”.

TS series: This is a tolerance based, epoxy encapsulated thermistor with insulated leads that can be board mounted or packaged into a probe assembly. The operating temperature runs from -50 °C to 110 °C. The bead diameter is 0.630”.

HP series: This is a tolerance based, epoxy encapsulated thermistor with uninsulated leads and with an operating temperature of -50°C to 110 °C. These can be packaged in probe assemblies or PCB mounted. There is a tie bar on the lead to facilitate elevated PCB mounting. The bead diameter is 0.140”.

HT series: This is a tolerance based, epoxy encapsulated thermistor with uninsulated leads and with an operating temperature of -50 °C to 110 °C. These can be packaged in probe assemblies or PCB mounted. These thermistors have longer leads. The bead diameter is 0.157”.

CS series: This epoxy encapsulated thermistor can be an interchangeable or tolerance based. It has insulated leads that can be short or long depending on the application. The operating temperature normally runs from -50 °C to 150 °C. These thermistors can be PCB mounted or packaged into probe housings. The bead dimension carries depending on the lead wires that are soldered to the chip inside the epoxy encapsulation.

LS series: This thermistor can be interchangeable or tolerance based with an operating temperature of -50 °C to 150 °C. These thermistors can be used as probe assemblies or packaged into probe assemblies. It has a PVC or ABS plastic probe housing with a diameter of 0.078”.

LSMN series: This thermistor can be interchangeable or tolerance based with an operating temperature of -50 °C to 150 ° C. These thermistors can be used as probe assemblies or packaged into probe assemblies. The polyamide probe diameter is as small as 0.035”.

CP series: Selco Products’ custom thermistor probes are custom built, durable, accurate, and reliable. Selco Products offers design services to help develop custom thermistor probe assembly solutions for your thermal management requirements. Utilizing any of the above product categories we can reverse engineer an existing design or build you a brand new product tailored to your application.

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