NTC THERMISTORS:
TYPE FM
DESCRIPTION:
MICROCIRCUIT THERMOFLAKES are think film
thermistor flakes which have no substrate backing.
They are supplied with two solderable electrodes
on one surface, making them ideally suited for
surface (substrate) or pin mounting. Through the
use of newly developed fabrication techniques, it
has been possible to obtain high temperature, low
noise devices which provide an order of magnitude
reduction in noise, when compared with other
commercially available flake thermistors.
MICROCIRCUIT THERMOFLAKES are available in
standard thickness of 0.003" – 0.005" for ease of
handling in high production application.
DIMENSIONS:
SPECIAL ORDER ONLY
DATA:
CONFIGURATION
MICROCIRCUIT THERMOFLAKES are made in stan-
dard square and rectangular forms as shown.
MAXIMUM TEMPERATURE
All MICROCIRCUIT THERMOFLAKES are designed
for continuous operation at temperatures up to
125°C. When additional pre-conditioning is speci-
fied units may be operated up to 300°C.
TEMPERATURE COEFFICIENTS &
RESISTANCE TEMPERATURE DATA
Varies between -3.3%/°C and -4.0%/°C @ 25°C,
depending on size, thickness and the resistance
of the Thermoflake.
THERMAL AND ELECTRICAL PROPERTIES
(Definitions and test methods per MIL-PRF-23648)
Thermal Time Constant Microcircuit Flakes
in still air
0.125 sec.
Dissipation Constant
in still air
Resistance Range
Maximum Power Range
0.50 mW/K
1k to 1M ohms
0.050 watts
Figure
Style Code
Configuration
Size (in inches)
STANDARD RESISTANCE VALUES
@ 25°C ± 40% AND ASSOCIATED
RATIO R25°C/R125°C
1
FM20
FM40
FM80
FM120
2
FMB20
FMB40
FMB60
Square
Square
Square
Square
Square
Rectangular
Rectangular
Rectangular
Rectangular
Dimension
0.020" x
0.040" x
0.080" x
0.120" x
(“L” x “L’)
0.020"
0.040"
0.080"
0.120"
RT
Ratio
1k
9.0
5k
11.5
50k 500k
19.8 29.7
Dimension (“W” x “L“)
0.020" x 0.040"
0.040" x 0.080"
0.060" x 0.120"
RT
Ratio
2k
9.0
10k
11.5
100k 1 Meg
19.8 29.7
BOWTHORPE THERMOMETRICS
Crown Industrial Estate, Priorswood Road
Taunton, Somerset TA2 8QY UK
Tel +44 (0) 1823 335200
Fax +44 (0) 1823 332637
THERMOMETRICS, INC.
808 US Highway 1
Edison, New Jersey 08817-4695 USA
Tel +1 (732) 287 2870
Fax +1 (732) 287 8847
KEYSTONE THERMOMETRICS CORPORATION
967 Windfall Road
St. Marys, Pennsylvania 15857-3397 USA
Tel +1 (814) 834 9140
Fax +1 (814) 781 7969
CODING:
The part number should be specified as follows:
FM 40
N
103
Q
{
NOTES:
Tolerance code for standard 40% tolerance units, see Note 2.
Zero power resistance @ 25°C, see Note 1.
Plain platinum alloy electrode surfaces.
Configuration and size code
FM designates a square unit.
FMB designates a rectangular unit.
1. The zero-power resistance @ 25°C, expressed in ohms, is
identified by a three digit number. The first two digits repre-
sent significant figures, the last digit is the number of zeroes
to follow. Therefore a 0.040" x 0.040" unit of 10k ohms and
standard tolerance would be specified as FM40N103Q.
2. Special tolerances are available on request. To specify a
non-standard tolerance, use the letter “S” followed by the
desired tolerance (i.e., S25 = ±25%).
BOWTHORPE THERMOMETRICS
Crown Industrial Estate, Priorswood Road
Taunton, Somerset TA2 8QY UK
Tel +44 (0) 1823 335200
Fax +44 (0) 1823 332637
THERMOMETRICS, INC.
808 US Highway 1
Edison, New Jersey 08817-4695 USA
Tel +1 (732) 287 2870
Fax +1 (732) 287 8847
KEYSTONE THERMOMETRICS CORPORATION
967 Windfall Road
St. Marys, Pennsylvania 15857-3397 USA
Tel +1 (814) 834 9140
Fax +1 (814) 781 7969
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