ISO-9001
Registered
ULTRA PRECISION
METAL FILM RESISTOR
Permanent digital
marking
MAR
SERIES
•
•
•
•
•
•
High Reliability
Ultra low temperature coefficient
Superior moisture performance
Tailored or standard values
Highest stability metal film available
Matched sets
IRC developed bulk
property metal film element
on ceramic substrate
Cap and lead
assembly
Rugged multiple
coat, epoxy mold
jacket protection
Laser adjusted to
resistance value,
tolerance
Electroplated
copper lead
ELECTRICAL DATA:
Power Rating at 85°C
Resistance Range
Limiting Element Voltage
TCR (-20 to +85°C)
ResistanceTolerance
Standard Values
Thermal Impedance
Ambient Temperature Range
Watts
Ohms
Volts
ppm/°C
%
MAR5
0.125
10 to 3M
250
5ppm-50ppm
.01%-1%
E24,E96
prefered
140
-55 to +155
MAR6
0.125
10 to 5M
300
5ppm-50ppm
.01%-1%
E24,E96
prefered
70
-55 to +155
MAR7
0.25
10 to 10M
500
5ppm-50ppm
.01%-1%
E24,E96
prefered
55
-55 to +155
Notes
See Value and Tolerance
Restrictions Below
°C/Watt
°C
BEST TOLERANCE/TCR COMBINATION:
TCR
ppm/°C
5
10
15
25
50
MAR5
.05%
.1-1%
.01-.02%
50 to 250K 10 to 250K 10 to 300K
50 to 250K 10 to 250K 10 to 350K
50 to 250K 10 to 250K 10 to 500K
50 to 250K 10 to 250K 10 to 1.5M
50 to 250K 10 to 250K 10 to 3M
.01-.02%
MAR6
.05%
.0-1%
to 500K 10 to 500K
to 500K 10 to 700K
to 500K 10 to 1M
to 500K 10 to 3M
10 to 5M
.01-0.2%
50 to 1M
50 to 1M
50 to 1M
50 to 1M
50 to 1M
MAR7
.05%
10 to 1M
10 to 1M
10 to 1M
10 to 1M
10 to 1M
.1-1%
10 to 1M
10 to 1.5M
10 to 3.5M
10 to 5M
10 to 10M
50 to 500K 10
50 to 500K 10
50 to 500K 10
50 to 500K 10
50 to 500K 10 to 500K
PHYSICAL DATA:
DIMENSIONS (mm) & WEIGHT (g)
PCB
Min
mounting Bend
D max
T min
centers Radius
d nom
2.59
35
10.2
0.6
0.6
3.94
35
13.5
0.6
0.6
4.95
35
19.4
0.6
0.6
L
Wt. nom
0.35
.58
1.10
d dia
d dia
L
T
T
Type
MAR5
MAR6
MAR7
L max
7.14
10.8
16.5
D
D
ADVANCED FILM DIVISION
4222 South Staples Street
•
Corpus Christi, Texas 78411
•
Tel: 512-992-7900
•
Fax: 512-992-2518
1
ISO-9001
Registered
MAR CONSTRUCTION
A metal film is deposited onto a high quality fire cleaned ceramic
former. Nickel-Plated steel caps are forced 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
rugged multiple coat and an epoxy molded jacket protection.
TERMINATIONS
Material: Solder coated copper wire.
Strength: The terminations meet the requirements of MIL-STD-1276.
Solderability:
The terminations meet the requirements of MIL-
STD-202.
MARKING
Type reference, TCR code, resistance value and tolerance.
SOLVENT RESISTANCE
The body protection and marking are resistant to all normal indus-
trial cleaning solvents suitable for printed circuits.
PERFORMANCE DATA:
MAR 5,6<500K
MAR 7<1MO
Test conditions per MIL-R-55182 except where noted
Load at rated power: 1000 hours at 85°C
Dry heat: 1000 hours at 155°C
Shelf life: 12 monts at room temperature
Derating from rated power at 85°C
Short term overload
Damp heat (IEC 68-2-3)
Thermal Shock (test per method 107, MIL-STD-202 condition F)
Effect of Solder (test per method 210, MIL-STD-202)
Vibration and Bump
Noise (in a decade of frequency)
Voltage Coefficient of Resistance
MAXIMUM
0.05
TYPICAL
0.02
0.08
0.003
Zero at 155°C
0.001
0.02
0.02
0.003
0.002
0.03
<0.05
MAR 5,6>500K
MAR 7>1MO
MAXIMUM
0.25
TYPICAL
0.05
0.2
0.02
Zero at 155°C
0.01
0.05
0.05
0.005
0.02
0.1
<0.1
ACTUAL PERFORMANCE ACTUAL PERFORMANCE
0.01
0.04
0.04
0.02
0.02
0.08
0.2
0.25
0.05
0.06
MATCHED SETS:
IRC has many years experience in the supply of matched sets of precision resistors. Refer to application notes for more details.
APPLICATION NOTES:
Resistors can be supplied matched for tolerance and TCR down to ±0.005% and ±1ppm/°C.
PACKAGING:
The standard packaging is loose in boxes. Taped resistors (on
reel in ammo pack) can also be supplied by special request.
In this case the usable lead length is reduced by the width of
the tape. A detailed taping specification is available upon
request.
ORDERING PROCEDURE:
Specify type reference etc. as indicated in this example of
MAR5 6.8K ohms 0.1% 50ppm/°C.
STANDARD QUANTITIES PER PACKAGE:
Type
Small Box
Large Box
Reel
Ammo Pack
Code
B
B
R
A
MAR5
200
2000
4000
1000
MAR6
100
1000
2000
1000
MAR7
35
300
1000
500
MAR5
Type
TCR 5(T16) 10(T13) 15(T10)
Value (USE IEC 62 Code)
Tolerance
Packaging details
T2
6K8
0.1%
B
2
ADVANCED FILM DIVISION
4222 South Staples Street
•
Corpus Christi, Texas 78411
•
Tel: 512-992-7900
•
Fax: 512-992-2518
