Modifications are available to existing standard product packages, such as adding connectors or changing wire size or length, as well as offering special resistance-temperature (R-T) curves, R-T curve matching, and custom lead forming and bending to discrete thermistors. In addition, the following options and services are available.
| NO | Item | Sign | Test Conditions | Min. | Normal value | Max. | Unit |
| 4-1. | Resistance at 25℃ | R25 | Ta=25±0.05℃ PT≦0.1mw | 27.0 | 30.0 | 33.0 | kΩ |
| 4-2. | B Value | B25/50 | | 3910.5 | 3950 | 3989.5 | k |
| 4-3. | Dissipation factor | σ | Ta=25±0.5℃ In still air | ≧2 | mw/℃ |
| 4-4. | Time constant | τ | Ta=25±0.5℃ In still air | ≦7 | sec |
| 4-5. | Operating temp.range | / | / | -20 | / | +125 | ℃ |
| 4-6 | Insulation resistance | / | 100V DC | 100 | / | / | MΩ |
| 4-7. | Withstand voltage test | / | 200V AC | 5 | / | / | Sec |
V Reliability Of The Epoxy Coated NTC Thermistor 30K 3950 Temperature Probe Chip
| NO | Item | Technical requirements | Test conditions and method |
| 5-1. | High temp. Test | DR/R25£±3% DB/B£±3% No change with withstand voltage, Insalution performance. Appearance without damage. | 100±5℃,power on 500±24 hrs,DC0.2mA |
| 5-2. | Low temp. tes | -20±5℃,power on 500±24 hrs,DC0.2mA |
| 5-3. | Endure moisture test | Store in environment 55±2℃,90%-95%RH for 500±24 hrs |
| 5-4. | Temp. cycle test | –20℃×30min→Room temp.×10min→ in 100℃ water×30min→Room temp.×10min 10 cycles |
| 5-5 | Load electrify test | Power on DC1mA, 500hrs in room temp. and humid. |
| 5-6 | Drop test | Free fall into concrete floor from height 1M ,10 cycle. |
| 5-7 | Vibration test | Frequency range:10～55HZ Total amplitude 1.52mm 1 cycle 1 min ,direction and time X,Y,Z axs 2Hr each. |
| 5-8 | Bending test | | Bend 180°binding site wire and epoxy resin.Back and forth 10 times |
| 5-9 | Tensile tests | | Put 2 kg of force lasts 1 min |
VI Fundamentals Of The Epoxy Coated NTC Thermistor 30K 3950 Temperature Probe Chip
Each temperature sensor style has its own set of operating principles, features, benefits, considerations,
and limitations for optimal use.
Thermistors (NTCs and PTCs): Thermistors are thermally sensitive resistors whose prime function is to
exhibit a large, predictable, and precise change in electrical resistance when subjected to a corresponding
change in body temperature. Negative Temperature Coefficient (NTC) thermistors exhibit a decrease in
electrical resistance when subjected to an increase in body temperature. Positive Temperature Coefficient
(PTC) thermistors exhibit an increase in electrical resistance when subjected to an increase in body temperature.
RTDs: Platinum Resistance Temperature Detectors (Pt-RTDs) are temperature sensors that have a positive,
predictable, and nearly linear change in resistance when subjected to a corresponding change in their body
temperature.
Digital Temperature Indicators: Digital Temperature Indicators have a positive relationship between resistance
and temperature. The response is very much like a digital signal; below the trip temperature, resistance will be
low, above the trip temperature, resistance will be very high. This digital response is ideal for applications where
knowing the temperature has increased beyond a specific value is required. With the digital response, no analog
to digital conversion is necessary, allowing designers to save time and space.
