Surface Mounted
Resistors
Welwyn Components
CR Series
Physical Data
Dimensions of Standard Styles (mm) & Weight (g)
Wrap around
Style
0503
0805
1005
1206
2010
2512
L
W
T max
0.5
A
B†
Not available
0.3 0.15 0.9 min 0.3 0.1
Not available 0.4 0.15 0.015
0.4 0.2 1.7 min 0.4 0.15 0.020
C
Wt
0.20 0.1 0.005
0.009
T
C
A
1.25 0.2 0.63 .15
2.0 0.2 1.25 0.15
2.5 0.3 1.25 0.2
3.2 0.2 1.6 0.2
5.1 0.3 2.5 0.2
6.5 0.3 3.2 0.2
B
C
L
W
A
0.6
T
Wrap-around terminations
(3 faces)
0.7
L
W
0.7
Planar terminations
0.7
0.6 0.3 3.0 min
0.6 0.3 4.4 min
N/A
N/A
0.036
0.055
Alternative styles for
surface mounting resistors
0.7
†This dimension determines the number of conductors which may pass under the surface mounted device.
Construction
Thick film resistor material, overglaze and organic protection
are screen printed on a 96% alumina substrate.
Solderability
Wrap-around terminations have an electroplated nickel barrier
and solder coating, this ensures excellent ‘leach’ resistance
properties and solderability. They will withstand immersion in
solder at 260°C for 30 seconds.
Terminations
Planar (or single-sided) termination is gold and suitable for
wire-bonding; wrap-around is suitable for soldering.
Marking
All relevant information recorded on the primary package or reel.
Performance Data
CECC 40401-008 CECC40401-004 CECC40401-003
Requirements Requirements Requirements
Actual
Maximum
Typical
Load at rated power: 1000 hours at 70°C ∆R%
2
2
≤ 3M3 2
2
0.25
>3M3 3
Shelf life: 12 months at room temp.
Derating from rated power at 70°C
Overload
∆R%
-
-
-
0.1
0.02
Zero at 155°C
Zero at 125°C
Zero at 125°C
∆R% 0805:1 1206:0.5
0.5
1
2
1
to 10M 1
>10M 2
1
0.1
0.2
Dry Heat: 1000 hours at UCT
(125°C for 003 & 004 - 155°C for 008)
Long term damp heat
∆R%
2
≤ 3M3 2
>3M3 3
>10M 1
0.25
∆R%
∆R%
∆R%
volts
2
2
2
1
2
Temperature rapid change
Resistance to solder heat
Voltage proof
0.5
0.5
0.5
0.5
0.25
0.05
0.25
0.05
0805 : 200
2010 : 400
1206 : 300
2512 : 500
0503 : 100
All others : 500
Note: An 0.01 ohm addition to be added to the performance of all resistors <10 ohms
Value Ranges (ohms)
Tolerance
%
Size
5
2
1
0.5
0.25
0.1
N/A
0503
0805
1005
1206
2010
2512
1 to 10M
1 to 100M
1 to 100M
1 to 100M
1 to 1M
1 to 10M
1 to 50M
1 to 50M
1 to 50M
1 to 1M
1 to 1M
10 to 10M
1 to 20M
1 to 20M
1 to 25M
1 to 1M
1 to 1M
100 to 1M
10 to 10M
10 to 10M
10 to 10M
10 to 10M
10 to 10M
N/A
100 to 1M
100 to 1M
100 to 1M
100 to 1M
100 to 1M
100 to 1M
100 to 1M
100 to 1M
N/A
1 to 1M
N/A
© 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
Issue F · 10.05
18
TTELEC [ TT Electronics ]
