Surface Mounted
Thermistors
PTCR Series
Welwyn Components
•
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
Electrical Data
Commercial
Power rating at 70°C
Resistance range
Limiting element voltage
TCR -55°C to 155°C
Resistance tolerance at 20°C
Ambient temperature range
Values
Thermal impedance
watts
ohms
volts
ppm/°C
%
°C
ohms
°C/watt
360
2, 5, 10
-55 to 155
E24 & E96 preferred
200
Any value to order
For 10 devices
mounted on a
50 x 25mm p.c.b. area
PTCR 0805
0.1
10R to 400R
100
PTCR 1206
0.25
10R to 800R
200
See table below
Notes
Variation of TCR within Value Range
Value range (ohms)
10 to <25
25 to <50
50 to <100
10 to <200
200 to <400
400 to <800
TCR (ppm/°C)
3500 ± 10%
3100 ± 10%
2900 ± 10%
2700 ± 15%
2400 ± 15%
2200 ± 15%
Resistance (ohms)
10000
1000
800R
100
10
1
-55
10R
-15
25
65
105
Temperature
°C
145
Physical Data
Dimensions (mm) and weight (g)
Style
0805
1206
L
W
T max
0.6
0.7
A
B*
Wt nom
0.009
A
Wrap-around terminations
(3 faces)
T
B
L
2.0 ± 0.3 1.25 ± 0.2
3.2 ± 0.4 1.6 ± 0.2
0.3 ± 0.15 0.9 min
0.4 ± 0.2
1.7 min
0.0090
A
W
*This dimension determines the number of conductors which may pass under the surface mounted device.
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.
A subsidiary of
TT electronics plc
Issue C · 08.04
© 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
37
WELWYN [ WELWYN COMPONENTS LIMITED ]
