Radial Leaded Epoxy Resin Coated NTC Thermistor Temperature Sensor, 40.27K ohm, Beta B(25/85):3979K, Temperature -40C to +125C.

AMWEI Product Code: AMF52-403G3979

Appearance and Dimension


Radial Resin NTC Thermistor Temperature Sensor

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: 40.27K ohm+/-2%
  • Beta Value B(25/85): 3979K+/-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 40.27K Ohm B3979K Resistance vs. Temperature RT Data

(K Ohm)
(K Ohm)
(K Ohm)
-40C 1282.4698 KΩ 20C 50.2806 KΩ 80C 5.0664 KΩ
-35C 932.0947 KΩ 25C 40.2700 KΩ 85C 4.3050 KΩ
-30C 684.0718 KΩ 30C 32.4609 KΩ 90C 3.6737 KΩ
-25C 507.2131 KΩ 35C 26.3293 KΩ 95C 3.1449 KΩ
-20C 379.5959 KΩ 40C 21.4835 KΩ 100C 2.7002 KΩ
-15C 286.8914 KΩ 45C 17.6296 KΩ 105C 2.3277 KΩ
-10C 218.804 KΩ 50C 14.5456 KΩ 110C 2.0132 KΩ
-5C 168.4057 KΩ 55C 12.0862 KΩ 115C 1.7466 KΩ
0C 130.683 KΩ 60C 10.0825 KΩ 120C 1.5195 KΩ
5C 101.8851 KΩ 65C 8.4424 KΩ 125C 1.3253 KΩ
10C 79.9700 KΩ 70C 7.0951 KΩ
15C 63.1971KΩ 75C 5.9845 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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