This Product Selection Guide contains information to help select products in the Temperature Sensors - NTC Thermistors category on DigiKey.com
NTC Thermistors, or Negative Temperature Coefficient Thermistors, are devices that change resistance in response to changes in temperature. With negative coefficient parts, their resistance decreases as their temperature increases. They are typically defined with variables such as the parts base resistance value at a set temperature, usually 25°C, and B values, the performance curve of temperature vs. resistance calibrated between two fixed points.
SelectionCharacteristics
Specifications to determine which NTC thermistor is right for your application.
Resistance in Ohms @ 25°C: The resistance value of the thermistor when tested at 25oC.
Resistance Tolerance: Characterizes the extent of permitted variability of overall device resistance among samples of a given part number, resulting from variations in manufacturing.
B Value Tolerance: Amount by which actual B (beta) values may deviate from listed values as a result of manufacturing variability.
B0/50: Characterizes a thermistor’s resistance vs. temperature curve, using a two point calibration at 0oC and 50oC.
B25/50: Characterizes a thermistor’s resistance vs. temperature curve, using a two point calibration at 25oC and 50oC.
B25/75: Characterizes a thermistor’s resistance vs. temperature curve, using a two point calibration at 25oC and 75oC.
B25/85: Characterizes a thermistor’s resistance vs. temperature curve, using a two point calibration at 25oC and 85oC.
B25/100: Characterizes a thermistor’s resistance vs. temperature curve, using a two point calibration at 25oC and 100oC.
Operating Temperature: Recommended operating temperature, typically given in a range or as a maximum. Exceeding these temperatures may affect performance or damage the device and other system components.
Power - Max: The maximum amount of power used by the device.
Length - Lead Wire: Indicates length of interconnect wires or cable, for parts equipped therewith.
Mounting Type: Indicates how the device is attached.
Package/Case: Indicates the type of protective case used on an electronic component to allow easy handling, installation, and protection. This selection was determined to be the closest industry standard applicable to the suppliers device packaging. Typically it is best to check the actual dimensions from the datasheet rather than depend on this terminology when designing your circuit.
ProductExamples
| MFR PART # | PT103J2 |
|---|---|
| DIGI-KEY PART # | 615-1010-ND |
| MANUFACTURER | Littelfuse Inc. |
| DESCRIPTION | NTC Thermistor 10k Bead, Epoxy |
| DATASHEET | Click Here |
| MFR PART # | ERT-JZEG103FA |
|---|---|
| DIGI-KEY PART # | P124053TR-ND - Tape & Reel (TR) |
| MANUFACTURER | Panasonic Electronic Components |
| DESCRIPTION | NTC Thermistor 10k 0201 (0603 Metric) |
| DATASHEET | Click Here |
| MFR PART # | 9409900030 |
|---|---|
| DIGI-KEY PART # | 478-9409900030-ND |
| MANUFACTURER | KYOCERA AVX |
| DESCRIPTION | NTC Thermistor 2.251k Module |
| DATASHEET | Click Here |
| MFR PART # | NTCLE100E3202JB0 |
|---|---|
| DIGI-KEY PART # | BC2523-ND |
| MANUFACTURER | Vishay Beyschlag/Draloric/BC Components |
| DESCRIPTION | NTC Thermistor 2k Bead |
| DATASHEET | Click Here |
| MFR PART # | B57301K0103A003 |
|---|---|
| DIGI-KEY PART # | 495-77171-ND |
| MANUFACTURER | EPCOS - TDK Electronics |
| DESCRIPTION | NTC Thermistor 10k Cylindrical Probe Assembly |
| DATASHEET | Click Here |
Schematic Symbol
Thermistor schematic symbol courtesy of Scheme-It please use the link for more information and symbols.
MediaLinks
Videos
NTC Thermistor Overview in 60 Seconds
Limiting Inrush Current with NTC and PTC Themistors
Videos on NTC Thermistors
Articles
Selecting a Thermistor or RTD
RTDs, PTCs, and NTCs: Temperature Sensors
Articles on NTC Thermistors
Product Training Modules
NTC Thermistors and Simulator - Murata
Choosing NTC Thermistors - Ametherm
Product Training Modules
TechForum
Characteristics of Thermistors - NTC and PTC
Negative Temperature Coefficient (NTC) Thermistor
TechForum posts on NTC Thermistors