Radial Leaded Epoxy Resin Coated NTC Thermistor  Temperature Sensor, 2K ohm, Beta B(25/50):3950K, Temperature -40C to +125C.

AMWEI Product Number: AMF52-202F3950

Appearance and Dimension

Radial Resin NTC Thermistor Temperature Sensor

Unit: mm

Radial  Leaded Epoxy Resin Coated  NTC Thermistor Application

Temperature sensing, control and compensation. E.g. inlet air temperature sensing thermistors or ECT in
automotive applications, sensor elements in industrial and commercial applications, heating systems and industrial
systems, medical equipment.

Radial Leaded Epoxy Resin Coated NTC Thermistor Electric Perfomance

  • Resistance at 25C R25: 2K ohm+/-1%
  • Beta Value B(25/50): 3950K+/-1%
  • Optional R25 resistance tolerance,  ±1%(F), ±2%(G), ±3%(H), or ±5%(J)
  • Dissipation Factor: δ≥3mW/℃.
  • Thermal Time Constant (in still air): ≤12 seconds.
  • Rated Powerwatt (below 25C): ≤50mW
  • Insulation resistance: room temperature, 500V, 60 Seconds, ≥100MΩ.
  • Operating temperature range: -40 to +125C.

NTC 2K Ohm 3950K Resistance vs. Temperature RT Data

(K Ohm)
(K Ohm)
(K Ohm)
-40C 68.593 KΩ 20C 2.498 KΩ 80C 0.253 KΩ
-35C 49.035 KΩ 25C 2.000 KΩ 85C 0.216 KΩ
-30C 35.608 KΩ 30C 1.606 KΩ 90C 0.184 KΩ
-25C 26.200 KΩ 35C 1.301 KΩ 95C 0.158 KΩ
-20C 19.497 KΩ 40C 1.062 KΩ 100C 0.137 KΩ
-15C 14.654 KΩ 45C 0.872 KΩ 105C 0.118 KΩ
-10C 11.114 KΩ 50C 0.721 KΩ 110C 0.103 KΩ
-5C 8.500 KΩ 55C 0.599KΩ 115C 0.090 KΩ
0C 6.554 KΩ 60C 0.500 KΩ 120C 0.078 KΩ
5C 5.092KΩ 65C 0.419 KΩ 125C 0.069 KΩ
10C 3.986 KΩ 70C 0.353 KΩ
15C 3.144 KΩ 75C 0.298 KΩ

Radial Leaded, Epoxy Resin Coated NTC Thermistor Mechanical Test

Test Standard Test Conditions and methods Requirements
Soldering & Solderability IEC60068-2-20
Test Ta
Temperature: 230±5 ℃,
2-2.5mm away from ceramic body
On: 2±0.5 Seconds.
The terminations shall be evenly tinned
Resistant to soldering heat IEC60068-2-20
Test Tb
Temperature: 260±5℃,
2-2.5mm away from ceramic body
On:10±1 Seconds.
No visible damage,
Lead wire tensile IEC60068-2-21
Test U
Test Ua: Force 10N, On 10 Seconds;
Test Ub: Bending 90C, Force 5N, Twice.
No break off,

Radial Leaded Epoxy Resin Coated NTC Thermistor Reliability Data

Test Standard Test Conditions ΔR25/R25 (typical) Remarks
Low temperature storage IEC 60068-2-1 Storage at low category temperature. Temperature: -40 oC Time: 1000hours ≤3% No visible damage
Storage in dry heat IEC 60068-2-2 Storage at upper category temperature. Temperature: 100 oC Time: 1000hours ≤3% No visible damage
Storage in damp heat, steady state (Humidity test) IEC 60068-2-3 Temperature: 40oC,
Humidity:90%-95% RH,
Duration:1000 hours
≤3% No visible damage
Rapid temperature cycling IEC 60068-2-14 1. -40C/30 minutes
2. 30C/5minutes
3. 100C/30 minutes
4. 30C/5minutes.
Number of cycles: 5 Cycles
≤3% No visible damage

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