PTC Surface Mount Thermistors
QT0805 Series
QTI™ brand PTC Surface Mount Thermistors
exhibit a stable, proportional and linear resistance
vs. temperature signal approximating 0.7% / ºC.
% Rated Power
PTC THERMISTORS
Dimensions QT0805 STYLE
T
he QT0805 is commonly designed into applications
requiring precision, narrow band, temperature point
matched control or broader temperature range circuit
compensation. Consistent component geometry with
Quality Thermistor’s reliable, full wrap-around Leach Guard
termination facilitates trouble-free, automated board
placement. R25 ºC values from 22 ohm through 36K ohm
offer circuit design flexibility.
L = .078" +/– .008"
W = .049" +/– .008"
T = .055" Max
BW = .016" +/– .010"
22
Surface Mount
Engineering Information
Positive Temperature Coefficient:
Operating Temperature Range:
Storage Temperature:
Thermal Time Constant:
Dissipation Constant:
Power Rating:
.7%/C
-55C to +100C
-65C to +150C
30 Seconds max.-Still Air
2.5 mW/C min.-Still Air
0.250 Watts @ 25C
derated to 100C (Table 1)
Power
TABLE 1
Derating Curve
100
80
60
40
20
0
0
25
50
75
85
100
125
150
Temperature (°C)
TABLE 2
Resistance Multipliers at Specified Temperature
TEMP. DEG. C
–55
–15
0
25
50
75
100
22-68 OHMS
.490
.790
.845
1.000
1.150
1.330
1.540
82-150 OHMS
.500
.730
.820
1.000
1.180
1.370
1.580
180-470 OHMS
.500
.730
.820
1.000
1.180
1.400
1.620
560-1200 OHMS
.500
.730
.815
1.000
1.200
1.420
1.660
1500-5600 OHMS
.500
.730
.835
1.000
1.180
1.450
1.670
6800-36K OHMS
.490
.720
.815
1.000
1.18
1.370
(1.650)
* Multipliers in parentheses must be characterized beyond 75C to 90C
through calibration testing.
TABLE 3
Resistance Tolerances at Specified Temperatures
TEMP. DEG. C
–55
–15
0
25
50
75
100
F +/– %
15
9
3
1
3
5
7
G +/– %
17
10
4
2
4
6
9
J +/– %
20
13
7
5
7
9
12
K +/– %\
25
18
12
10
12
14
17
Ordering Information
Q T 0 8 0 5 - 102 K
Tolerance Code
Number of Zeros
1st 2 Sig. Digits
Product Style
Tolerance Code:
K = 10% with Tin/Lead Terminations
J = 5% with Tin/Lead Terminations
G = 2% with Tin/Lead Terminations
F = 1% with Tin/Lead Terminations
E
D
C
B
=
=
=
=
10% with Gold Terminations
5% with Gold Terminations
2% with Gold Terminations
1% with Gold Terminations
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