Precision Metal
Film Resistors
RC series
CECC released products with low
TCRs over a wide resistance range
Resistance tolerance down to 0.05%
Express delivery available
Low noise and negligible voltage coefficient
Screened parts available for critical
applications
Electrical Data
RC55
Commercial
Power rating at 70°C
Resistance range
Limiting element voltage
Isolation voltage
TCR (20 to +70°C) & codes
Resistance tolerance
CECC 40101-004 Requirements
Power rating at 70°C
Resistance range
Limiting element voltage
Isolation voltage
TCR & codes
Resistance tolerance (code)
CECC 40101-804 Requirements
Power rating at 70°C
Resistance range
Limiting element voltage
Isolation voltage
TCR & codes
Resistance tolerance (code)
watts
ohms
volts
volts
ppm/°C
%
watts
volts
volts
ppm/°C
%
A
0.125
1R to 1M
200
280
B
0.25
1R to 1M
250
350
watts
ohm
volts
volts
ppm/°C
%
H
0.063
200
280
J
0.125
200
280
0.25
1R to 4M
350
500
0.5
1R to 4M
350
500
5(V), 10(T), 15(Y), 25(D), 50(C), 100(Z)
0.05(W), 0.1(B), 0.25.(C), 0.5(D) & 1(F)
K
0.25
250
350
K
0.25
10R to 1M
250
350
15(Y), 25(D), 50(C), 100(Z)
0.05(W), 0.1(B), 0.25.(C), 0.5(D) & 1(F)
B
0.25
10R to 1M
250
350
15(Y), 25(D), 50(C), 100(Z)
0.05(W), 0.1(B), 0.25.(C), 0.5(D) & 1(F)
C
0.5
10R to 1M
350
500
See resistance
restrictions
L
0.5
10R to 1M
350
500
See resistance
restrictions
1.0
1R to 10M
500
700
See resistance
restrictions
RC65
RC70
Notes
ohms 1R to 1M 1R to 1M 1R to 1M
These tables indicate the CECC specification requirements, and these are met or exceeded by the corresponding RC series products.
Standard values
Thermal impedance
Ambient temperature range
°C/watt
°C
110
E24, E96 preferred
70
-55 to +155
60
Any value
to order
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.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
07. 11
Precision Metal
Film Resistors
RC series
Physical Data
Dimensions (mm) & Weight (g)
PCB
mounting
Type
RC55
RC65
RC70
L max
7.2
10.0
15.5
D max
2.5
3.7
5.5
f min
30
30
30
d nom
0.6
0.6
0.8
centres
10.2
12.7
18.4
Min.
Bend
Radius
0.6
0.6
1.2
Wt. nom
0.24
0.40
1.15
d
D
L
f
Construction
A metal film is deposited onto a high quality ceramic former.
Nickel-plated steel caps are force fitted to the former and
termination wires are welded to the caps.
The resistor is adjusted to value by a helical cut in the film
and the body is protected with a specially formulated epoxy
coating.
Marking
Type reference, TCR code, resistance value and
tolerance code.
The resistance values conform to IEC 62.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents 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.
Performance Data
CECC 40101-004 CECC 40101-804
Requirements
Load at commercial rating: 1000 hours at 70°C
Load at CECC rating: 1000 hours at 70°C
Dry heat: 1000 hours 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
∆R%
∆R%
∆
R%
∆R%
∆R%
∆R%
0.5
0.5
Not specified
Zero at 155°C
0.1
0.5
55/155/56
0.5
0.1
0.1
0.1
Not specified
Not specified
0.5
0.5
Not specified
50% at 125°C
0.1
0.5
55/125/56
0.5
0.1
0.1
0.1
Not specified
Not specified
Requirements
*Actual Performance
Maximum
0.3
0.3
**1.0
0.1
0.1
0.3
55/155/56
0.5
**0.2
0.06
0.06
1.0
0.1
0.05
0.03
0.02
0.1
<1
Typical
0.1
0.05
0.15
0.03
0.02
0.1
50% at 125°C & Zero at 155°C
Note:
*An 0.01 ohm addition to be added to the performance claims of all resistors <10R.
** All products within the specified approved range meet CECC requirements.
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.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
07. 11
Precision Metal
Film Resistors
RC series
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
- 1%
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
- 1%
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% 0.5%
3
- 1%
3
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
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% or 1%
Application Notes
Matched Sets and Networks
TT electronics has many years experience in the supply of
matched set 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 TCR of
±5ppm/°C.
A low inductance version is available at 1% tolerance.
For low inductance version add suffix N.
Packaging
The standard method of packaging RC55 resistors is taped in
ammo packs. Taped resistors on reel or loose packed
components can also be supplied by special request. The
standard packaging for RC65 and RC70 resistors is loose in
boxes. By special request the RC65 components can also be
supplied taped on reel or in ammo pack. In the case of tape
packed components the usable lead length is reduced by the
width of the tape.
5
f
1
6
52
1
f
2
6
– f
2
≤
1.4 mm
Body location f
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.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
07. 11
Precision Metal
Film Resistors
RC series
Ordering Procedure
Type
Trim option
N
Standard
Non-inductive
5 ppm/
°C
10 ppm/
°C
Y
D
Example: RC55 with TCR of 5ppm/ °C at 31.6 kilohms and 0.1% tolerance in an ammo pack box of up to 1000 pieces -
RC55 V
–
31K6B
I
All tolerances
1% only
15 ppm/
°C
25 ppm/
°C
C 50ppm/
°C
Z 100ppm/
°C
TCR
V
T
Value (use IEC62 code)
Tolerance (use IEC62 code)
W
B
C
D
F
I
0.05%
0.1%
0.25%
0.5%
1%
Ammo
Bulk
RC55, RC65
RC70
Up to1000/box
250/box
Standard
Packing
For CECC released product state on order the CECC numb er and style. Example:
RC55Y-31K6BI CECC40101-004 JY
For CECC 40101-804 the TCR codes T and E relate to 15 and 25ppm/°C and are coded in the MPN as Y and D respectively
Example:
RC65Y-31K6BI CECC 40101-804BT
For SnPb finish instead of Pb-free replace the packing suffix with
PB.
Example:
RC55V-31K6BPB
For 5ppm/°C screened product, replace the packing suffix with
SC.
Example:
RC55V-31K6BSC
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.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
07. 11
DIY/Open Source Hardware
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