Radial Leaded Glass Encapsulated Bead NTC Thermistor 100K Ohm Beta B(25/50) 3950K, Temperature Measurement -40C to +300C

AMWEI Product Number: AMF58B-104F3950

Radial Glass Bead NTC Shape and Dimension

Radial Glass Bead NTC Thermistor

Radial Glass Bead NTC Thermistor

  • Glass body diameter D: 1.3±0.2 mm
  • Glass body Length L1: 2.8 mm Max
  • Dumet Lead Wire (copper-clad FeNi) length L2: 65±5 mm
  • Dumet Lead Wire  Diameter Φd: 0.2 ±0.05 mm:
D L1 L2 Φd±0.05
1.3±0.2 mm 2.8 mm Max 65±5 mm 0.2 mm

Radial Glass Bead NTC 100K Ohm 3950K Application

For high temperature measurement upto 300C. Typical application in industrial process control, motors, heating and air conditioning (HVAC) , medical industry, 3D printing, food processing, etc.

Radial Glass Bead NTC Thermistor Electric Characteristics Data

  • Resistance at 25C R25: 100K ohm+/-1%
  • Beta Value B(25/50): 3950K+/-1%
  • Optional R25 resistance tolerance,  ±1%(F), ±2%(G), ±3%(H), or ±5%(J)
  • Dissipation Factor: 0.5 mw/℃ min.
  • Thermal Time Constant (in still air): 6.5 seconds max.
  • Insulation resistance: room temperature, 50VDC, 60 Seconds, 10 MΩ min.
  • Operating temperature range: -40 to +300C.

NTC 100K Ohm 3950K Resistance vs. Temperature RT Data

-40C 3283.068 KΩ 80C 12.386 KΩ 200C 0.561 KΩ
-35C 2364.601 KΩ 85C 10.530KΩ 205C 0.509 KΩ
-30C 1728.310 KΩ 90C 8.985 KΩ 210C 0.462 KΩ
-25C 1279.210 KΩ 95C 7.694 KΩ 215C 0.420 KΩ
-20C 957.158 KΩ 100C 6.610 KΩ 220C 0.383 KΩ
-15C 723.060 KΩ 105C 5.698 KΩ 225C 0.349 KΩ
-10C 550.905 KΩ 110C 4.926 KΩ 230C 0.319 KΩ
-5C 423.023 KΩ 115C 4.272 KΩ 235C 0.292 KΩ
0C 327.187 KΩ 120C 3.714 KΩ 240C 0.268 KΩ
5C 254.804 KΩ 125C 3.238 KΩ 245C 0.246 KΩ
10C 199.749 KΩ 130C 2.830 KΩ 250C 0.226 KΩ
15C 157.602 KΩ 135C 2.479 KΩ 255C 0.208 KΩ
20C 125.142 KΩ 140C 2.176 KΩ 260C 0.192 KΩ
25C 100.000 KΩ 145C 1.915 KΩ 265C 0.178 KΩ
30C 80.419 KΩ 150C 1.688 KΩ 270C 0.165 KΩ
35C 65.087 KΩ 155C 1.497 KΩ 275C 0.153 KΩ
40C 53.020 KΩ 160C 1.330 KΩ 280C 0.142 KΩ
45C 43.473 KΩ 165C 1.185 KΩ 285C 0.132 KΩ
50C 35.882 KΩ 170C 1.058 KΩ 290C 0.123 KΩ
55C 2.9688 KΩ 175C 0.947 KΩ 295C 0.114 KΩ
60C 24.713 KΩ 180C 0.849 KΩ 300C 0.107 KΩ
65C 20.657 KΩ 185C 0.764 KΩ
70C 17.345 KΩ 190C 0.688 KΩ
75C 14.628 KΩ 195C 0.621 KΩ

Radial Glass Bead 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 Glass Bead NTC Thermistor Reliability Data

Test Standard Test Conditions ΔR25/R25 (typical) Remarks
Low temperature storage IEC 60068-2-1 Storage at low category temperature: -40C, Time: 1000 hours ≤3% No visible damage
Storage in dry heat IEC 60068-2-2 Storage at upper category temperature: 250C, Time: 1000 hours ≤3% No visible damage
Storage in damp heat, steady state (Humidity test) IEC 60068-2-3 Temperature: 40C,
Humidity:90%-95% RH,
Duration: 1000 hours
≤3% No visible damage
Temperature cycling IEC 60068-2-14 1. -30C/30 minutes
2. 80C/5minutes
3. 250C/30 minutes
4. 80C/5minutes.
Number of cycles: 5 Cycles
≤3% No visible damage

Contact of NTC thermistors with any liquids and solvents shall be prevented. It must be ensured that no water enters the NTC thermistors (e.g. through plug terminals).
Avoid dewing and condensation unless thermistor is specified for these conditions.


Standard package is loose bulk plastic bag package.

Note: Other Resistance Part and More information can be founded in AMWEI Radial Leaded Glass Encapsulated NTC Thermistor Temperature Sensor Temperature Sensor Page.