M, C, T
Vishay Dale
NTC Thermistors,Coated
FEATURES
• Small size - conformally coated.
• Wide resistance range.
• Available in 11 different R-T curves.
DESCRIPTION
Models M, C, and T are conformally coated, leaded
thermistors for standard PC board mounting or assembly in
probes. The coating is baked-on phenolic for durability and
long-term stability. Models M and C have tinned solid copper
leads.
Model T has solid nickel wires with Teflon
®
insulation to
provide isolation when assembled in metal probes or
housings.
DIMENSIONS
in inches [millimeters]
TINNED COPPER WIRE
BODY DIA.
MAX.
TEFLON INSULATED NICKEL WIRE
1/4 NOM.
BODY DIA.
MAX.
24
±
0.5 [609.6
±
12.7]
1.5 [36.1] MIN.
CLEAN LEAD LENGTH
LD DIAMETER
Type M
Type C
Type T
WIRE SIZE
AWG 30: 0.0100 [0.254]
AWG 28: 0.0126 [0.320]
AWG 30: 0.0100 [0.254]
ORDERING INFORMATION
1
CURVE NUMBER
C
MODEL
2001
VALUE
First three digits are
significant. The last
digit is the multiplier.
(2000 ohm is illustrated.)
Point Match Tolerances
F =
±
1%
@ 25°C
G =
±
2%
@ 25°C
H =
±
3%
@ 25°C
J =
±
5%
K =
±
10%
@ 25°C
@ 25°C
F
TOLERANCE
Curve Track Tolerances
A3 =
±
1°C
0°C to + 70°C
B3 =
±
0.5°C 0°C to + 70°C
C3 =
±
0.2°C 0°C to + 70°C
A2 =
±
1°C
B2 =
±
0.5°C
C2 =
±
0.2°C
A4 =
±
1°C
B4 =
±
0.5°C
A5 =
±
1°C
B5 =
±
0.5°C
C5 =
±
0.2°C
A8 =
±
1°C
B8 =
±
0.5°C
C8 =
±
0.2°C
- 20°C to + 50°C
- 20°C to + 50°C
- 20°C to + 50°C
0°C to + 100°C
0°C to + 100°C
+ 25°C to + 90°C
+ 25°C to + 90°C
+ 25°C to + 90°C
0°C to + 50°C
0°C to + 50°C
0°C to + 50°C
See following pages for Tolerance
explanation and details
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18
For technical questions, contact thermistor1@vishay.com
Document Number: 33003
Revision 11-Feb-02
M, C, T
NTC Thermistors, Coated
SELECTION GUIDE FOR TYPE M, C, AND T THERMISTORS
R
25
(Ohms)
27
33
50
56
68
82
100
120
150
180
220
270
330
390
470
500
560
680
820
1K
1.2K
1.5K
1.8K
2.2K
2.7K
3.3K
3.9K
4.7K
5K
5.6K
6.8K
8.2K
10K
12K
15K
18K
22K
27K
33K
39K
47K
50K
56K
68K
82K
100K
120K
150K
180K
220K
270K
330K
390K
470K
500K
560K
680K
820K
1 Meg
Document Number: 33003
Revision 11-Feb-02
CURVE NUMBER
1
2
3
4
7
8
9
12
14
17
MAXIMUM BODY DIAMETER
0.125 [3.2]
0.110 [2.8]
0.095 [2.4]
Vishay Dale
DISSIPATION CONSTANT
2 - 3 mWatts/°C
THERMAL TIME CONSTANT
6 - 14 Seconds
NOTE:
1. Intermediate resistance values between
the standard value series are available.
Size would be the same as the color
grouping.
2. Other body diameters available. Bead
diameter increases as Res. decreases.
(Consult Factory)
3. Leaded series of thermistors includes
additional styles: (Consult Factory)
Type B:
Type F:
Type E:
Type D:
Type G:
Type H:
26AWG lead, .0159 [.40]
32AWG lead, .008 [ .20]
24AWG lead, .020 [ .51]
22AWG lead, .025 [.64]
20AWG lead, .032 [ .81]
18AWG lead, .040 [1.02]
For technical questions, contact thermistor1@vishay.com
www.vishay.com
19
M, C, T
Vishay Dale
NTC Thermistors, Coated
TOLERANCES AVAILABLE FOR TYPE M, C AND T THERMISTORS
Description of Thermistor Tolerances
The many applications of thermistors have mandated the need for two basic tolerance schemes for these products - Curve
Tracking and Point Match Thermistors. An example of the resistance tolerance at various temperatures for the two different
tolerancing methods is described in the following graph:
10
9
8
±
5% POINT MATCH CURVE
TOLERANCE (
±
%)
7
6
5
4
3
2
1
0
A2
25
°
C
±
1
°
C CURVE TRACK CURVE
A8
A3
A4
A5
- 50
- 40
- 30
- 20
- 10
10
20
30
40
50
60
70
80
90
100
110
120
130
140
TEMPERATURE (
°
C)
Curve Tracking Tolerance:
Thermistors are calibrated at the high temperature of the curve track range and then final tested at the low temperature of the
curve track range. This ensures that the thermistor will meet the specified temperature accuracy at every temperature within
the desired temperature range. Several temperature ranges are available and the accuracy of the thermistor may be
±
0.2°C,
±
0.5°C, and
±
1.0°C. The Curve Tracking temperature ranges and their code designators are shown in Figure 1 and Table 1.
To specify, add the appropriate suffix from the following table to the part number.
Example: 1M1002-B3 = Curve 1, 10 kilohms at + 25°C, curve tracking to
±
0.5°C from 0°C to + 70°C
STANDARD ELECTRICAL SPECIFICATIONS FOR CURVE TRACKING THERMISTORS
TEMP. RANGE
TOLERANCE
PART NO. SUFFIX
C
U
R
V
E
1
2
4
8
9
0
°
C to + 70
°
C
- 20
°
C to + 50
°
C
0
°
C to + 100
°
C
25
°
C to + 90
°
C
0
°
C to + 50
°
C
±
1
°
C
±
0.5
°
C
±
0.2
°
C
- A3
X
X
X
X
X
- B3
X
X
X
X
X
- C3
X
X
X
X
X
±
1
°
C
±
0.5
°
C
±
0.2
°
C
- A2
X
X
X
X
X
- B2
X
X
X
X
X
- C2
X
X
X
X
X
±
1
°
C
±
0.5
°
C
±
0.2
°
C
- A4
X
X
X
X
X
- B4
X
X
X
X
X
- C4
N/A
N/A
N/A
N/A
N/A
±
1
°
C
±
0.5
°
C
±
0.2
°
C
±
1
°
C
±
0.5
°
C
±
0.2
°
C
- A5
X
X
X
X
X
- B5
X
X
X
X
X
- C5
X
X
X
X
X
- A8
X
X
X
X
X
- B8
X
X
X
X
X
- C8
X
X
X
X
X
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For technical questions, contact thermistor1@vishay.com
150
0
Document Number: 33003
Revision 11-Feb-02
M, C, T
NTC Thermistors, Coated
POINT MATCH TOLERANCE
The standard leaded thermistors are calibrated and tested at 25°C to a tolerance of
±
5% or
±
10%; however, tighter tolerance,
point matched thermistors are readily available as are special point match temperatures to fit your application.
Since these thermistors have only one controlled point of reference ( the point match temperature ), the resistance at other
temperatures is given by the "Resistance VS Temperature Conversion Tables" for the appropriate material curve. The resistance
value at any temperature is the ratio factor times the resistance at 25°C.
Example: 1M1002-5, +70°C resistance = (Resistance factor for curve 1 at 70°C is .1990) X (10000 ohm resistance at 25°C)
= 1990 ohms.
The tolerance of the resistance at any temperature is described by Figure 2.
Vishay Dale
FIGURE 2
POINT MATCH TOLERANCES VS. TEMPERATURE
MAX. R VS. T
MIN. R VS. T
Point match resistance tolerances at temperatures other than
25ºC are not the same as the calibration temperature. This
difference is presented in Figure 2.
The tolerance at any given temperature is the point match
tolerance + the MT
±%
(Manufacturing Tolerance).
The MT
±%
may be obtained from the R vs. T Conversion
tables and is added to the point match temperature, i.e.,
±
1% Tol. at 25ºC +
±
2.6% at -30ºC for Curve 1 equals a total
tolerance of
±
3.6% at -30ºC.
RESISTANCE
NOMINAL R VS. T
PIVOT POINT
(CALIBRATION TEMPERATURE)
25
°
C
TEMPERATURE
COMPUTER AIDS FOR THERMISTOR SELECTION
A spreadsheet is available for the Vishay Thermistor Materials that calculates Beta, Steinhart-Hart Equation Constants A, B,
and C, the resistance at any temperature based upon the Steinhart constants or Beta, the temperature equivalent of the
resistance reading, and resistance temperature coefficients.
This spread sheet will also calculate the total resistance tolerance of any point matched thermistor for temperatures in 10ºC
increments, and the resistance tolerance at any temperature within the calibrated range of curve tracking thermistors. Please
contact factory if interested in this Excel™ spreadsheet.
Document Number: 33003
Revision 11-Feb-02
For technical questions, contact thermistor1@vishay.com
www.vishay.com
21
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