Precision Metal Film Resistor
IRC Advanced Film Division
RC Series
•
Resistance tolerance down to ±0.05%
•
Low noise and negligible voltage coefficient
•
CECC released product with low TCRs over a wide resistance range
•
100% tin plated (Pb-free, RoHS compliant) leads
Electrical Data
RC55
Commercial
Power Rating At 70°C
Resistance Range
Limiting Element Voltage
Isolation Voltage
TCR (20 to +70°C) & codes
Resistance Tolerance
Approved CECC 40101-004
Power Rating At 70°C
Resistance Range
Limiting Element Voltage
Isolation Voltage
TCR & Codes
Resistance Tolerance (code)
Approved CECC 40101-804
Power Rating At 70°C
Resistance Range
Limiting Element Voltage
Isolation Voltage
TCR & Codes
Resistance Tolerance (code)
Standard Values
Thermal Impedance
Ambient Temperature Range
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.
A subsidiary of
TT electronics plc
Issue B · 03.02
RC65
0.5
1R to 4M
350
500
RC70
1.0
1R to 10M
500
700
Notes
Watts
Ohms
Volts
Volts
ppm/°C
%
H
0.25
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)
J
0.125
1R to 1M
200
280
K
0.25
1R to 1M
250
350
K
0.25
10R to 1M
250
350
L
0.5
10R to 1M
350
500
See resistance
restrictions
Watts
Ohms
Volts
Volts
ppm/°C
%
0.063
1R to 1M
200
280
15(Y), 25(D), 50(C) & 100(Z)
0.05(W), 0.1(B), 0.25(C), 0.5(D) & 1(F)
A
B
0.25
1R to 1M
250
350
B
0.25
10R to 1M
250
350
C
0.5
10R to 1M
350
500
See resistance
restrictions
Watts
Ohms
Volts
Volts
ppm/°C
%
0.125
1R to 1M
200
280
15(T), 25(E) & 50(C)
0.05(W), 0.1(B), 0.25(C), 0.5(D) & 1(F)
E24, E96 Preferred
See resistance
restrictions
°C/Watt
°C
110
70
-55 to +155
60
Any value to order
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0)
in product
· Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
IRC reserves the right to make changes
1670 822181
specification without notice or
·
liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print.
General Note
© IRC Advanced Film Division
• Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Email: afdsales@irctt.com • Website: www.irctt.com
173
A subsidiary of
TT electronics plc
RC Series Issue May 2007
Precision Metal Film Resistor
IRC Advanced Film Division
Physical Data
Dimensions (mm) & Weight (g)
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
PCB Mounting
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
100% tin plated over copper wire
The teminations 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
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 Dampl Heat
Temperature Rapid Change
Resistance To Solder Heat
Vibration and Bump
Noise (in a decade of frequency)
Voltage Coefficient Of Resistance
Note:
CECC 40101-804
Requirements
0.5
0.5
Not specified
50% at 125°C
0.1
0.5
55/155/56
0.5
0.1
0.1
0.1
Not specified
Not specified
*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
∆R%
∆R%
∆
R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
µV/V
ppm/V
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
*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.
© IRC Advanced Film Division
• Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Email: afdsales@irctt.com • Website: www.irctt.com
RC Series Issue May 2007
Precision Metal Film Resistor
IRC Advanced Film Division
Table of Resistance Restrictions
Tolerance
TCR
ppm/°C
5
10
15
25
50
100
RC55
0.05%
10 to 500K
10 to 1M
10 to 1M
10 to 1M
10 to 1M
10 to 1M
0.1 - 0.25%
10 to 500K
10 to 1M
5 to 1M
5 to 2M
5 to 2M
1 to 2M
0.5 - 1%
1 to 500K
1 to 1M
1 to 1M
1 to 2M
1 to 4M
1 to 4M
0.05%
10 to 1M
10 to 1M
10 to 1M
10 to 1M
10 to 1M
RC65
0.1 - 0.25%
10 to 1M
5 to 1M
5 to 2M
5 to 2M
1 to 2M
0.5 - 1%
1 to 500K
1 to 1M
1 to 1M
1 to 2M
1 to 4M
1 to 4M
0.05%
10 to 1M
10 to 1M
10 to 1M
10 to 1M
10 to 1M
10 to 500K 10 to 500K
RC70
0.1 - 0.25%
10 to 1M
10 to 2M
10 to 5M
5 to 10M
1 to 10M
0.5 - 1%
1 to 750K
1 to 1M
1 to 2M
1 to 5M
1 to 10M
1 to 10M
10 to 750K 10 to 750K
Application Notes
Matched Sets and Networks
Welwyn 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 ±2 ppm/°C, either as
seperate resistors or pre-assembled and encapsulatd
within a plastic box.
The individual resistors within a set or module can be
manufactured with a tolerance of ±0.05% and TCR of
±5 ppm/°C.
A low inductance version is available at 1% tolerance.
For low inductive 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 suppled by
special request. The standard packaging for RC65
and RC70 resistors is loose in boxes. By special
request the RC65 components can also be suppled
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
Ordering Data
Prefix
Type
RC55LF, RC65LF, RC70LF
f
1
RC55LF
C
6K8
B
B
f
2
52
6
RC
-
6
Body location f
1
– f
2
≤
1.4 mm
TCR Code
V = ±5 ppm/°C, T = ±10 ppm/°C, Y = ±15 ppm/°C
D = ±25 ppm/°C, C = ±50 ppm/°C
Standard Quantities Per Package
Type
Small box
Large box
Reel
Large ammo
RC55
250
1000
5000
1000
RC65
125
500
2500
1000
RC70
25
250
-
-
Resistance Value
Ex: 6K8 = 6.8KΩ
Tolerance
F = ±1%, D = ±0.5%, C = ±0.25%, B = ± 0.1%, A = ±0.05%
Packaging
A = ammo pack; B = bulk; T = tape and reel
For additional inforamiotn or to discuss your specific requirements,
please contact our Applications Team using the contact details below.
© IRC Advanced Film Division
• Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Email: afdsales@irctt.com • Website: www.irctt.com
RC Series Issue May 2007
DIY/Open Source Hardware
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