Radial Leaded Glass Encapsulated Bead NTC thermistor 10K Ohm Beta B(25/50) 3950K, Temperature Measurement Range -40C to +300C

AMWEI Product Number: AMF58B-103F3950

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 10K 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: 10K 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 10K Ohm 3950K Resistance vs. Temperature RT Data

-40C 283.3811 KΩ 80C 1.2429 KΩ 200C 0.0671 KΩ
-35C 209.0590 KΩ 85C 1.0594 KΩ 205C 0.0613 KΩ
-30C 156.8160 KΩ 90C 0.9069 KΩ 210C 0.0562 KΩ
-25C 118.9527 KΩ 95C 0.7797 KΩ 215C 0.0516 KΩ
-20C 90.9311 KΩ 100C 0.6730 KΩ 220C 0.0474 KΩ
-15C 69.9035 KΩ 105C 0.5831 KΩ 225C 0.0436 KΩ
-10C 53.9812 KΩ 110C 0.5071 KΩ 230C 0.0403 KΩ
-5C 41.8540 KΩ 115C 0.4425 KΩ 235C 0.0372 KΩ
0C 32.5807 KΩ 120C 0.3874 KΩ 240C 0.0344 KΩ
5C 25.4687 KΩ 125C 0.3402 KΩ 245C 0.0319 KΩ
10C 20.0003 KΩ 130C 0.2996 KΩ 250C 0.0296 KΩ
15C 15.7850 KΩ 135C 0.2646 KΩ 255C 0.0275 KΩ
20C 12.5266 KΩ 140C 0.2343 KΩ 260C 0.0256 KΩ
25C 10.0000 KΩ 145C 0.2080 KΩ 265C 0.0238 KΩ
30C 8.0338 KΩ 150C 0.1851 KΩ 270C 0.0222 KΩ
35C 6.4976 KΩ 155C 0.1655 KΩ 275C 0.0207 KΩ
40C 5.2921 KΩ 160C 0.1483 KΩ 280C 0.0194 KΩ
45C 4.3415 KΩ 165C 0.1332 KΩ 285C 0.0182 KΩ
50C 3.5882 KΩ 170C 0.1200 KΩ 290C 0.0170 KΩ
55C 2.9688 KΩ 175C 0.1083 KΩ 295C 0.0160 KΩ
60C 2.4693 KΩ 180C 0.0980 KΩ 300C 0.0150 KΩ
65C 2.0645 KΩ 185C 0.0889 KΩ
70C 1.7348 KΩ 190C 0.0808 KΩ
75C 1.4649 KΩ 195C 0.0735 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.