Resistors
Metal
Precision
Film Resistors
Precision Metal Film Resistors
RCP series
RCP series
Welwyn Components
Low TCRs over a
0.05%
resistance range
Tolerance down to
wide
Tolerance down to 0.05%
Low noise and negligible voltage coefficient
Express delivery
negligible voltage coefficient
Low noise and
available
Express delivery available
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
Precision resistors with
Precision resistors with uprated power
uprated power
resistance range
Low TCRs over a wide
Electrical Data
RC55P
Power rating at 70°C
Resistance range
Limiting element voltage
Isolation voltage
TCR (20 to +70°C)
Resistance tolerance
Standard values
Thermal impedance
Ambient temperature range
°C/watt
°C
110
watts
ohms
volts
volts
ppm/°C
%
0.5
1R to 4M
350
500
RC65P
1.0
1R to 4M
500
500
5, 10, 15, 25, 50, 100
0.05, 0.1, 0.25 & 0.5
E24, E96 preferred
70
-55 to +155
60
RC70P
1.5
1R to 10M
500
700
See resistance
restrictions
Any value to order
Notes
Physical Data
Dimensions (mm) and Weight (g)
PCB
mounting
d nom. centres
0.6
0.6
0.8
10.2
12.7
18.4
Min
Bend
Radius
0.6
0.6
1.2
Wt.
nom.
0.24
0.40
1.15
Type
RC55P
RC65P
RC70P
L Max
7.2
10.0
15.5
D Max
2.5
3.7
5.5
f min
30
30
30
d
D
L
f
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.
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.
Terminations
Material
Strength
Solderability
Solder-coated copper wire.
The terminations meet the requirements of
IEC 68.2.21
The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2
General Note
General Note
Welwyn Components reserves the right to make changes in product specification
or liability.
TT Electronics reserves the right to make changes in product specification without notice
without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
A subsidiary of
TT electronics plc
www.ttelectronics.com/resistors
07.11
05.18
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
© TT Electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: +44 (0) 1670
176
Precision Metal
Precision Metal
Film Resistors
RCP series
RCP series
Film Resistors
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
%
∆R
%
∆R
%
∆R
%
0.10
0.3
0.015
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
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
1
10
15
25
50
2
100
2
0.05%
10R to 1M
10R to 1M
10R to 1M
10R to 1M
10R to 1M
RC55
0.1 - 0.25%
10R to 1M
2R49 to 1M
2R49 to 2M
2R49 to 2M
1R to 2M
0.5%
3
1R to 500K
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
10R to 500K 10R to 500K
RC65
0.1 - 0.25%
10R to 1M
5R to 1M
5R to 2M
5R to 2M
1R to 2M
0.5%
3
1R to 500K
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
10R to 500K 10R to 500K
RC70
0.1 - 0.25%
10R to 1M
10R to 2M
10R to 5M
5R to 10M
1R to 10M
0.5%
3
1R to 1M
1R to 2M
1R to 5M
1R to 10M
1R to 10M
10R to 750K 10R to 750K 10R to 750K
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
RC55P and RC65P standard packing is in tape with 52mm tape pitch and 5mm component pitch, packed in an ammo box.
RC70P is bulk packed. Taped resistors on reel or loose packed components can also be supplied by special request.
General Note
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
TT Electronics reserves the
822181 · Facsimile: +44 (0) 1670 829465 · Email:
notice or liability.
Telephone: +44 (0) 1670
right to make changes in product specification without
info@welwyn-tt.com · Website: www.welwyn-tt.com
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
07.11
www.ttelectronics.com/resistors
© TT Electronics plc
05.18
Precision Metal
Film Resistors
RCP series
Ordering Procedure
Example: RC55PV-31K6BI
(RC55P with TCR ±5ppm/°C at 31.6 kilohms ±0.1%, Pb-free)
R
C
5
1
1
Type
RC55P
RC65P
RC70P
2
TCR (ppm/°C)
V = ±5
T = ±10
Y = ±15
D = ±25
C = ±50
Z = ±100
5
P
V
2
3
Value
-
3
1
3
K
6
B
4
4
Tolerance
I
5
5
Finish, Screening & Packing
Pb-free (RoHS)
E24 = 3/4 characters W = ±0.05% I
E96 = 4/5 characters B = ±0.1% SC Pb-free with screened TCR (5ppm only)
C = ±0.25% PB
Sn(95)Pb(5) finish
R = ohms
K = kilohms
D = ±0.5%
All above in Standard Packing
M = megohms
RC55P
Up to 5000/box
Ammo
RC65P
Up to 2500/box
RC70P
Bulk
250/box
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.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
05.18
