General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print. A subsidiary of
TT electronics plc
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
© IRC Advanced Film Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
RC Series Issue November 2009 Sheet 1 of 3
Standard Values E24, E96 Preferred Any value to
order
Thermal Impedance °C/Watt 110 70 60
Ambient Temperature Range °C -55 to +155
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 RC65 RC70 Notes
Commercial
Power Rating At 70°C Watts 0.25 0.5 1.0
Resistance Range Ohms 1R to 4M 1R to 4M 10R0 to 10M
Limiting Element Voltage Volts 350 350 500
Isolation Voltage Volts 500 500 700
TCR (20 to +70°C) & codes ppm/°C 5(V), 10(T), 15(Y), 25(D), 50(C) & 100(Z) See resistance
restrictions
Resistance Tolerance % 0.05(W), 0.1(B), 0.25(C), 0.5(D) & 1 (F)
Approved CECC 40101-004 H J K K L
Power Rating At 70°C Watts 0.063 0.125 0.25 0.25 0.5
Resistance Range Ohms 1R to 1M 1R to 1M 1R to 1M 10R to 1M 10R to 1M
Limiting Element Voltage Volts 200 200 250 250 350
Isolation Voltage Volts 280 280 350 350 500
TCR & Codes ppm/°C 15(Y), 25(D), 50(C) & 100(Z) See resistance
restrictions
Resistance Tolerance (code) % 0.05(W), 0.1(B), 0.25(C), 0.5(D) & 1(F)
Approved CECC 40101-804 A B B C
Power Rating At 70°C Watts 0.125 0.25 0.25 0.5
Resistance Range Ohms 1R to 1M 1R to 1M 10R to 1M 10R to 1M
Limiting Element Voltage Volts 200 250 250 350
Isolation Voltage Volts 280 350 350 500
TCR & Codes ppm/°C 15(T), 25(E) & 50(C) See resistance
restrictions
Resistance Tolerance (code) % 0.05(W), 0.1(B), 0.25(C), 0.5(D) & 1(F)
Precision Metal Film Resistor
RC Series Issue November 2009 Sheet 2 of 3
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
© IRC Advanced Film Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
Precision Metal Film Resistor
Physical Data
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.
Terminations
Material 100% tin plated over copper wire
Strength The teminations meet the requirements of
IEC 68.2.21.
Solderability The terminations meet the requirements
of IEC 115-1, Clause 4.17.3.2.
Marking
dna eulav ecnatsiser ,edoc RCT ,ecnerefer epyT
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.
Dimensions (mm) & Weight (g)
Type L
Max
D
Max
F
Min
D
Nom
PCB
Mounting
Centers
Min
Bend
Radius
Wt.
Nom
RC55 7.2 2.5 30 0.6 10.2 0.6 0.24
RC65 10.0 3.7 30 0.6 12.7 0.6 0.40
RC70 15.5 5.5 30 0.8 18.4 1.2 1.15
Environmental Data
CECC 40101-004 CECC 40101-804 *Actual Performance
Requirements Requirements Maximum Typical
Load At Commercial Rating: 1000 Hours At 70°C --- --- 0.3 0.1
Load At CECC Rating: 1000 Hours At 70°C 0.5 0.5 0.3 0.05
Dry Heat: 1000 Hours at 155°C 0.5 0.5 **1.0 0.15
Shelf Life: 12 Months at Room Temperature Not specified Not specified 0.1 0.03
Derating From Rated Power At 70°C Zero at 155°C 50% at 125°C --- ---
Short Term Overload 0.1 0.1 0.1 0.02
Climatic 0.5 0.5 0.3 0.1
Climatic Category 55/155/56 55/155/56 55/155/56 ---
Long Term Damp Heat 0.5 0.5 0.5 0.1
Temperature Rapid Change 0.1 0.1 **0.2 0.05
Resistance To Solder Heat 0.1 0.1 0.06 0.03
Vibration and Bump 0.1 0.1 0.06 0.02
Noise (in a decade of frequency) Not specified Not specified 1.0 0.1
Voltage Coefficient Of Resistance Not specified Not specified --- <1
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.
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
µV/V
ppm/V
Lf
D
d
RC Series Issue November 2009 Sheet 3 of 3
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
© IRC Advanced Film Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
Precision Metal Film Resistor
Table of Resistance Restrictions
Tolerance
TCR
ppm/°C
RC55 RC65 RC70
0.05% 0.1 - 0.25% 0.5 - 1% 0.05% 0.1 - 0.25% 0.5 - 1% 0.05% 0.1 - 0.25% 0.5 - 1%
5 10 to 500K 10 to 500K 1 to 500K 10 to 500K 10 to 500K 1 to 500K 10 to 750K 10 to 750K 1 to 750K
10 10 to 1M 10 to 1M 1 to 1M 10 to 1M 10 to 1M 1 to 1M 10 to 1M 10 to 1M 1 to 1M
15 10 to 1M 5 to 1M 1 to 1M 10 to 1M 5 to 1M 1 to 1M 10 to 1M 10 to 2M 1 to 2M
25 10 to 1M 5 to 2M 1 to 2M 10 to 1M 5 to 2M 1 to 2M 10 to 1M 10 to 5M 1 to 5M
50 10 to 1M 5 to 2M 1 to 4M 10 to 1M 5 to 2M 1 to 4M 10 to 1M 5 to 10M 1 to 10M
100 10 to 1M 1 to 2M 1 to 4M 10 to 1M 1 to 2M 1 to 4M 10 to 1M 1 to 10M 1 to 10M
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
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
±5 ppm/°C.
A low inductance version is available at 1% tolerance.
For low inductive version add suffix N.
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 re-
duced by the width of the tape.
Type RC55 RC65 RC70
Small box 250 125 25
Large box 1000 500 250
Reel 5000 2500 -
Large ammo 1000 1000 -
Standard Quantities Per Package
Packaging
52
f1
5
66
f2
Body location: f1 - f2 ≤ 1.4mm
Prefix RC - RC55LF C 6K8 B B
Type
RC55LF, RC65LF, RC70LF
TCR Code
V = ±5 ppm/°C, T = ±10 ppm/°C, Y = ±15 ppm/°C
D = ±25 ppm/°C, C = ±50 ppm/°C
Resistance Value
Ex: 6K8 = 6.8KΩ
Tolerance
F = ±1%, D = ±0.5%, C = ±0.25%, B = ± 0.1%, W = ±0.05%
Packaging
A = Ammo Pack; B = Bulk; T = Tape and Reel
For additional information or to discuss your specific requirements,
please contact our Applications Team using the contact details below.
Ordering Data
