Precision Metal Film Fixed Resistors
Type R Series
Literature No. 1773265
Issued: 04-05
Dimensions are shown for
reference purposes only.
Dimensions are in millimetres
unless otherwise specified.
Specifications subject to
change.
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Key Features
■Precision metal film resistors
with tolerance to 0.1% and
temperature coefficients to
15ppm.
■Metal film resistors have
excellent stability under load
and severe environmental
conditions. They exhibit very
low noise current and voltage
coefficients. Precision metal
film resistors are particularly
suitable in all applications
where long-term stability is
important.
Type R Series
The resistive element comprises a thin
film of nickel-chrome alloy evaporated
onto a high thermal conductivity
ceramic element. Metal end caps are
force fitted to the element prior to
spiralling to value. Tinned copper lead
wires are welded to the end caps and
the components are then coated. One
coat of phenolic resin is followed by
three coats of epoxy resin. All resistors
are tested for value and tolerance.
Characteristics -
Electrical
YR8 ER8 CR8 YR1 ER1 CR1 YR2 ER2 CR2
Rated Power @ 70 °C (W) 0.125 0.25 0.5
Resistance Range (ohms) Min 51R1 10R 10R
Max 511K 1M0 1M0
Tolerance (%) 0.1 0.25 0.5
Code Letter B C D
Temperature Coefficient (ppm/°C) ± 15 ± 25 ± 50 ± 15 ± 25 ± 50 ± 15 ± 25 ± 50
Selection Series E96
Limiting Element Voltage - Nominal (V) 200 250 350
Maximum Overload Voltage (V) 400 500 700
Operating Temperature Range (°C) -65 to +155
Dielectric Strength (V) 500
Insulation Resistance Min Dry (Mohms) 10,000
Voltage Coefficient Max (ppm/V) 5
Derating Curve
Dimensions
Style L* D d nom
R8 3.3 ± 0.1 1.7 ± 0.2 0.45
R1 6.3 ± 0.3 2.3 ± 0.2 0.6
R2 9.5 ± 0.5 3.5 ± 0.5 0.6
* Length is measured in accordance with IEC 294
40 60 70 80 100 120 140 160
Ambient Temperature (°C)
100
80
60
40
20
0
Percent Rated Power
Surface Temperature Vs Load
0 20 40 60 80 100
Percent Rated Power
40
30
20
10
0
Temperature Rise (°C)
Precision Metal Film Fixed Resistors
Type R Series
Literature No. 1773265
Issued: 04-05
Dimensions are shown for
reference purposes only.
Dimensions are in millimetres
unless otherwise specified.
Specifications subject to
change.
www.tycoelectronics.com
passives.tycoelectronics.com
Mounting
The resistors are suitable for processing on automatic insertion equipment and cutting and bending machines.
Marking
The resistors are marked with a five-band colour code in accordance with IEC 62.
Packaging
R series colour coded resistors are normally supplied taped in ‘ammo’ boxes of 1000 pieces.
All tape specifications are in accordance with IEC286-1.
How to Order
Orders for these components should include the following information:-
Type, tolerance code letter and value e.g. YR1 B 24K3
Performance Characteristics
Evaluation of the performance characteristics is carried out with reference to IEC specifications
QC 400 000 and QC 400 100.
TEST REF Long Term Tests ±(1% + 0.05 ohm)
4.23 Climatic sequence
4.24 Damp heat, steady state
4.25.1 Endurance at 70 °C
4.25.3 Endurance at 125 °C
TEST REF Short Term Tests ±(0.25% + 0.05 ohm)
4.13 Overload
4.16 Robustness of terminations
4.18 Resistance to soldering heat
4.19 Rapid change of temperature
4.22 Vibration
