Quick details
• Small Size and fast response and light weight
• Available tolerances: ±0.5%, ±1%, ±2%, ±3% and ±5%
• B Value tolerances: ±0.5%, ±1.0% and ±2.0%
• Resistance calibration available at 37°C ±0.01% (see table for details of grouping)
• Long-term Stability and Reliability
• Excellent Tolerance and Interchangeability
• Available in all popular resistance values
• Dissipation Constant ≥0.7mW/°C
• Time Constant of ≤3.2 seconds
• Rated Power: 3.5mW
• Operating Temperature Range -40°C to 100°C
Description
The MF51E NTC Thermistors were specially designed for use in electronic thermometers which require better than average accuracy. The extremely small size allows the thermistor to respond very quickly to tiny changes in temperature. The MF51E can be supplied un-calibrated with standard tolerances or calibrated and grouped according to R at 37°C±0.01% for extreme interchangeability so as to eliminate the need for other calibrations.
Application
• Electronic Thermometers
• Medical Equipment and Patient Monitoring
Specification
Dimensions  Dimension | D max | L 1 max | L 1 +/- 3 | L 2 +/- 1 | d +/- 0.05 | Normal size | 1.6 | 4.0 | 100 | 3 | 0.2 | 1.6 | 4.0 | 87 | 3 | 0.2 | Special size | Customer Specified | Customer Specified | Customer Specified | Customer Specified | Customer Specified | |
Main Techno Parameter Part No. | Nominal resistance R 25ƒC | B Value (R25/50ƒC) | Rated power (mw) | Dissipation (mW/ƒC) | Thermal time constant (S) | Operating temp. (ƒC) | Range (KΩ) | Tolerance (%) | Nominal value (K) | Tolerance (%) | MF51E3270 MF51E3380 MF51E3470 MF51E3600 MF51E3950 MF51E4000 MF51E4050 MF51E4150 MF51E4300 MF51E4500 | 0.2-20 0.5-50 0.5-50 1-100 5-100 5-100 5-200 10-250 20-1000 20-1000 | E+/-0.5 F+/-1 G+/-2 H+/-3 J+/-5 | 3270 3380 3470 3600 3950 4000 4050 4150 4300 4500 | E+/-0.5 F+/-1 G+/-2 | 3.5 | ≥ 0.7 | ≤ 3.2 | -40ƒ - +100 | |
Specification  |
Resistance Calibration at 37†C +/- 0.01†C of MF51E503F3950 Group | Resistance | Group | Resistance | Group | Resistance | min | mid | max | min | mid | max | min | mid | max | 1 | 29.085 | 29.111 | 29.137 | 12 | 29.668 | 29.695 | 29.721 | 23 | 30.264 | 30.291 | 30.318 | 2 | 29.138 | 29.164 | 29.189 | 13 | 29.722 | 29.749 | 29.775 | 24 | 30.319 | 30.346 | 30.373 | 3 | 29.190 | 29.216 | 29.242 | 14 | 29.776 | 29.802 | 29.828 | 25 | 30.374 | 30.401 | 30.428 | 4 | 29.243 | 29.269 | 29.294 | 15 | 29.829 | 29.856 | 29.883 | 26 | 30.429 | 30.456 | 30.483 | 5 | 29.295 | 29.322 | 29.348 | 16 | 29.884 | 29.910 | 29.936 | 27 | 30.484 | 30.511 | 30.538 | 6 | 29.349 | 29.375 | 29.400 | 17 | 29.937 | 29.964 | 29.991 | 28 | 30.539 | 30.566 | 30.593 | 7 | 29.401 | 29.428 | 29.454 | 18 | 29.992 | 30.019 | 30.045 | 29 | 30.594 | 30.622 | 30.649 | 8 | 29.455 | 29.481 | 29.507 | 19 | 30.046 | 30.073 | 30.100 | 30 | 30.650 | 30.677 | 30.703 | 9 | 29.508 | 29.535 | 29.561 | 20 | 30.101 | 30.128 | 30.154 | 31 | 30.704 | 30.731 | 30.758 | 10 | 29.562 | 29.588 | 29.614 | 21 | 30.155 | 30.182 | 30.209 | 32 | 30.759 | 30.785 | 30.811 | 11 | 29.615 | 29.641 | 29.667 | 22 | 30.210 | 30.237 | 30.263 | | | | | |