MF55 Thin Film Thermistor
MF55 series is a thin film type thermistor, NTC a chip is soldered
on a thin lead frame, and then packaged with an insulating polymer
film. The maximum thickness is only 0.6mm (usually 0.5mm).
Film-type thermistors are more effective at measuring surface
temperature, or can be mounted in a tiny gap.
(1) Product features:
Surface temperature measurement with excellent performance
very small thermal time constant
Working temperature range: -50~90'C
Small size, fast response, high test accuracy
Good interchangeability and consistency
(2) Scope of application:
· Copies, printers, office appliances, frequency conversion fans,
mobile power supplies.
· Fire alarm system, grain depot storage system, aluminum electric
control panel.
· Battery protection board
. Automobile circuits, automobile braking systems, flow meters and
other occasions where the space is narrow and the temperature is
high, or the response time is short.
· Thermometer, lithium battery temperature protection.
(3) Structural size
(4) Specifications:
example:
LK MF55 — 503 — 4100 — 2
———————————
① ② ③ ④ ⑤
Among them:
① represents Dongguan Linkun Electronic Technology Co., Ltd.
② indicates a thin film NTC thermistor.
③Standard resistance value at 25°C (R25°C) For example: 503 means
R25°C is 50KΩ.
④B value (B25/50°C) For example: 4100 means B25/50°C is 4100K.
⑤ R25°C resistance value accuracy: 1 (±1%), 2 (±2%), 3 (±3%), 5
(±5%)
Standard Specification Of The NTC Thermal Resistor
| Part Number | Norminal Resistance | B Value(K) | Operating temperature |
| R25 (KΩ) | Tolerance | (25/50℃) | (25/85℃) | Tolerance | (℃) |
| MF55□502□3270A | 5 | ±1％ ±2％ ±3％ ±5％ | 3270 | | ±1％ ±2％ ±3％ ±5％ | -50～125 |
| MF55□502□3470A | 5 | 3470 | |
| MF55□103□3380A | 10 | 3380 | |
| MF55□103□3435B | 10 | | 3435 |
| MF55□103□3470B | 10 | | 3470 |
| MF55□103□3950A | 10 | 3950 | |
| MF55□103□3975B | 10 | | 3975 |
| MF55□203□3950A | 20 | 3950 | |
| MF55□303□3950A | 30 | 3950 | |
| MF55□473□3950A | 47 | 3950 | |
| MF55□503□3950A | 50 | 3950 | |
| MF55□104□3950A | 100 | 3950 | |
Notes:
(5) Matters needing attention:
1). The MF55 series thermistor is a thin film thermistor. Please do
not shake, squeeze, or pull hard at the base of the two pins.
Welding method: The metal body is directly welded to the body for
welding. Do not use soldering to avoid mis-soldering. Please do not
bend the resistor wire frame at will to prevent the chip and wire
frame from falling off, causing poor resistance;
2). The temperature during welding shall not exceed 300°C, and the
welding time shall not exceed 0.5 seconds;
3). Use a heat gun when shrinking the sleeve, and the temperature
of the air gun should be controlled at about 120°C;
4). When welding, use a constant-temperature soldering iron with a
flat tip. Hold the resistor in one hand and the wire in one hand
for butt welding, which can improve production efficiency and
shorten welding time;
5). Special note: Do not touch the chip (i.e. the top of the
resistor) with your hands!
(6) Do not test the MF55 thermistor in the air. The temperature
difference in the air is large and the measurement is very
inaccurate. It often produces deviations of more than 1-2°C. A
high-precision constant-temperature oil tank must be used for
measurement, and the NTC to be measured is placed in the
constant-temperature oil tank. Finally, the temperature of the
thermostatic bath must be stable before use.
