Precision Metal
Film Resistors
RCP series
Welwyn Components
Application Notes
Matched Sets and Networks
Welwyn has many years experience in the supply of matched
sets of precision resistors.
Resistors can be supplied matched for tolerance and TCR
down to ±0.02% and ±2ppm/°C, either as separate resistors
or pre-assembled and encapsulated within a plastic box.
The individual resistors within a set or module can be
manufactured with a tolerance of ±0.05% and a TCR of
±5ppm/°C.
Performance Data
RC55P Values 10
≤
100k
Actual Performance
Maximum
Load at rated power : 1000 hrs at 70°C
Dry heat : 1000 hrs at 155°C
Shelf life : 12 months at room temperature
Derating from rated power at 70°C
Short term overload
Climatic
Climatic category
Long term damp heat
Temperature rapid change
Resistance to solder heat
Vibration and bump
Noise (in a decade of frequency)
Voltage coefficient of resistance
∆R
%
∆R
%
∆R
%
∆R
%
µV/V
ppm/V
0.25
0.04
0.02
0.2
0.1
∆R
%
∆R
%
0.5
0.25
55/155/56
0.05
0.02
0.003
0.002
0.03
<1
0.5
0.2
0.06
0.06
1.0
∆R
%
∆R
%
∆R
%
0.10
0.3
0.015
Zero at 155°C
0.005
0.05
Typical
0.03
0.1
0.003
Other Values/Styles
*Actual Performance
Maximum
0.5
1.0
0.1
Zero at 155°C
0.1
0.3
55/155/56
0.1
0.05
0.03
0.02
0.1
<1
0.02
0.1
Typical
0.1
0.15
0.03
*An 0.01 ahm addition to be added to the performance claims of all resistors <10R.
Table of Resistance Restrictions
Tolerance
TCR
ppm/°C
5
10
15
25
50
100
0.05%
10R to 1M
10R to 1M
10R to 1M
10R to 1M
10R to 1M
RC55P
.1-.25%
10R to 1M
5R to 1M
5R to 2M
5R to 2M
1R to 2M
.5-1%
1R to 500
1R to 1M
1R to 1M
1R to 2M
1R to 4M
1R to 4M
0.05%
10R to 500
10R to 1M
10R to 1M
10R to 1M
10R to 1M
10R to 1M
10R to 500k 10R to 500k
RC65P
.1-.25%
10R to 500
10R to 1M
5R to 1M
5R to 2M
5R to 2M
1R to 2M
.5-1%
1R to 500
1R to 1M
1R to 1M
1R to 2M
1R to 4M
1R to 4M
0.05%
10R to 1M
10R to 1M
10R to 1M
10R to 1M
10R to 1M
RC70P
.1-.25%
10R to 1M
10R to 2M
10R to 5M
5R to 10M
1R to 10M
.5-1%
1R to 750k
10R to 1M
1R to 2M
1R to 5M
1R to 10M
1R to 10M
10R to 750k 10R to 750k
Packaging
The standard method of packaging RC55P resistors is taped in
ammopacks. Taped resistors on reel or loose packed
components can also be supplied by special request. The
standard packaging for RC65P and RC70P resistors is loose in
boxes. By special request the R65P components can also be
supplied taped on reel or in ammopack. In the case of tape
packed components the usable lead length is reduced by the
width of the tape.
Standard Quantities Per Package
Type
Small box
Large box
Reel
Ammo pack
RC55P
250
1000
5000
1000
RC65P
125
500
2500
1000
RC70P
25
250
© 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 B · 03.02
177
WELWYN [ WELWYN COMPONENTS LIMITED ]
