
Surface Mounted
Thermistors
PTCR Series
TCR’s up to +3500 ppm
Custom designs available
Solder terminations have a nickel barrier layer
Resistance range 10 ohms to 800 ohms
Tolerances down to 2%
Available in 0805 and 1206 sizes
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Electrical Data
Issue C · 08.04
A subsidiary of
TT electronics plc
Welwyn Components
Commercial
PTCR 0805
PTCR 1206
Notes
Power rating at 70°C
watts
0.1
0.25
Resistance range
ohms
10R to 400R
10R to 800R
Limiting element voltage
volts
100
200
TCR -55°C to 155°C
ppm/°C
See table below
Resistance tolerance at 20°C
%
2, 5, 10
Ambient temperature range
°C
-55 to 155
Values
ohms
E24 & E96 preferred
Any value to order
Thermal impedance
°C/watt
360
200
For 10 devices
mounted on a
50 x 25mm p.c.b. area
Variation of TCR within Value Range
Value range (ohms)
TCR (ppm/°C)
10 to <25
3500 ± 10%
25 to <50
3100 ± 10%
50 to <100
2900 ± 10%
10 to <200
2700 ± 15%
200 to <400
2400 ± 15%
400 to <800
2200 ± 15%
Physical Data
10000
1000
100
10
1
-55 -15 25 65 105 145
Temperature
°
C
R
10R
800R
Dimensions (mm) and weight (g)
Style
L
W
T max
A
B*
Wt nom
0805
2.0 ± 0.3 1.25 ± 0.2
0.6
0.3 ± 0.15
0.9 min
0.009
1206
3.2 ± 0.4
1.6 ± 0.2
0.7
0.4 ± 0.2
1.7 min
0.0090
*This dimension determines the number of conductors which may pass under the surface mounted device.
T
W
A
A
B
L
Wrap-around terminations
(3 faces)