Precision Metal
Film Resistors
RCP series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
© TT electronics plc
09. 11
· Precision resistors with
uprated power
· Low TCRs over a wide resistance range
· Tolerance down to 0.05%
· Low noise and negligible voltage coefficient
· Express delivery available
Precision Metal
Film Resistors
RCP series
sPrecision resistors with
uprated power
sLow TCRs over a wide resistance range
sTolerance down to 0.05%
sLow noise and negligible voltage coefficient
sExpress delivery available
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
176
RC55P RC65P RC70P Notes
Power rating at 70°C watts 0.5 1.0 1.5
Resistance range ohms 1R to 4M 1R to 4M 1R to 10M
Limiting element voltage volts 350 500 500
Isolation voltage volts 500 500 700
TCR (20 to +70°C) & codes ppm/°C
Resistance tolerance (code) % 0.05(W), 0.1(B), 0.25(C) & 0.5(D) restrictions
Standard values E24, E96 preferred Any value to order
Thermal impedance °C/watt 110 70 60
Ambient temperature range °C -55 to +155
Electrical Data
07.11
A subsidiary of
TT electronics plc
Welwyn Components
Construction
Ceramic rods are coated with a metal film and plated steel
caps are force fitted. A helical cut is used to adjust the film to
its final value.
Termination wires are welded to the caps and the resistor is
protected with a specially formulated epoxy coating.
Terminations
Material Solder-coated copper wire.
Strength The terminations meet the requirements of
IEC 68.2.21
Solderability The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2
Dimensions (mm) and Weight (g)
PCB Min
mounting Bend Wt.
Type L Max D Max f min d nom. centres Radius nom.
RC55P 7.2 2.5 30 0.6 10.2 0.6 0.24
RC65P 10.0 3.7 30 0.6 12.7 0.6 0.40
RC70P 15.5 5.5 30 0.8 18.4 1.2 1.15
Physical Data
L
D
f
d
Marking
Type reference, TCR code, resistance value and tolerance
code. The resistance value marking conforms to IEC 62.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning fluids suitable for printed circuits.
5(V), 10(T), 15(Y), 25(D), 50(C), 100(Z) See resistance
Precision Metal
Film Resistors
RCP series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
© TT electronics plc
09. 11
RC55P Values 10 ≤100k Other Values/Styles
Actual Performance *Actual Performance
Maximum Typical Maximum Typical
Load at rated power : 1000 hrs at 70°C ∆R % 0.10 0.03 0.5 0.1
Dry heat : 1000 hrs at 155°C ∆R % 0.3 0.1 1.0 0.15
Shelf life : 12 months at room temperature ∆R % 0.015 0.003 0.1 0.03
C°551 ta oreZC°551 ta oreZC°07 ta rewop detar morf gnitareD
Short term overload ∆R % 0.5 0.005 0.1 0.02
Climatic ∆R % 0.25 0.05 0.3 0.1
65/551/5565/551/55yrogetac citamilC
Long term damp heat ∆R % 0.25 0.05 0.5 0.1
Temperature rapid change ∆R % 0.04 0.02 0.2 0.05
Resistance to solder heat ∆R % 0.02 0.003 0.06 0.03
Vibration and bump ∆R % 0.2 0.002 0.06 0.02
1.00.130.01.0V/Vµ)ycneuqerf fo edaced a ni( esioN
1<1<V/mppecnatsiser fo tneiciffeoc egatloV
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.
Precision Metal
Film Resistors
RCP series
© 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 07.11
Welwyn Components
Application Notes
Performance Data
*An 0.01 ahm addition to be added to the performance claims of all resistors <10R.
Table of Resistance Restrictions
Tolerance
07CR56CR55CRRCT
0.05% 0.1 - 0.25% 0.5%
3
0.05% 0.1 - 0.25% 0.5%
3
0.05% 0.1 - 0.25% 0.5%
3
ppm/°C
50
2
5
1
10
10R to 500K
10R to 1M 10R to 1M
2R49 to 1M
2R49 to 2M
2R49 to 2M
1R to 2M
10R to 1M
10R to 1M
10R to 1M
10R to 1M
10R to 500K 1R to 500K
1R to 1M
1R to 1M
1R to 2M
1R to 4M
1R to 4M
10R to 1M
10R to 1M
10R to 1M
10R to 1M
10R to 1M
10R to 1M
5R to 1M
5R to 2M
5R to 2M
1R to 2M
10R to 1M
10R to 1M
10R to 1M
10R to 1M
10R to 1M
10R to 1M
10R to 2M
10R to 5M
5R to 10M
1R to 10M
1R to 1M
1R to 2M
1R to 5M
1R to 10M
1R to 10M
1R to 1M
1R to 1M
1R to 2M
1R to 4M
1R to 4M
10R to 500K 10R to 500K 1R to 500K 10R to 750K 10R to 750K 10R to 750K
15
25
100
2
Note1:
1. Based on sampling. 100% screened product is available.
2. For maximum availability, where the ohmic value permits, 25ppm/˚C is preferred to 50 or 100ppm/˚C.
3. For maximum availability, where the ohmic value permits, 0.25% is preferred to 0.5%.
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.
Precision Metal
Film Resistors
RCP series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
© TT electronics plc
09. 11
Precision Metal
Film Resistors
RCP series
© 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 07.11
Welwyn Components
Ordering Procedure
Example: RC55P with TCR of 5ppm/°C at 31.6 kilohms and 0.1% tolerance in an ammo pack
box of up to 1000 pieces -
R C 5 5 P V – 3 1 K 6 B I
Type
TCR
V
5 ppm/ °C
Y
15 ppm/ °C
T
10 ppm/ °C
D
25 ppm/ °C
C
Z
Value (use IEC62 code)
Tolerance (use IEC62 code)
W
0.05%
B
0.1%
C
0.25%
Packing
I
Ammo
RC55P, RC65P
Up to 1000/box
Standard
Bulk
RC70P
250/box
For 5ppm/°C screened product, replace the packing suffix with SC. Example: RC55PV-31K6BSC
D0.5%