OA/OP
SERIES
TM
PHYSICAL CONFIGURATION
OPEN FRAME
CURRENT SENSE/LOW OHM
OPEN FRAME TYPE
Note : Resistance values must be checked using 4½ digit micro ohm meter with four wire system and
insulated clips, which should be attached to the resistor leads over centered length "LM" in the case of OA
series and at the weld points in OP series.
Profile Dimensions
3.0mm [+0.5]
<4.0mm
+
38 1
Weld Point
L1
+
38 1
+
φ 0.8 0.05
LM(+1)
Side View
< 4.0mm
Cone 0° - 10°
Profile DimensionsSide View
P
φ 0.8/1.0
Weld Point
4.5+1
H
MP
MP-Measurement Point
OP SERIES (PCB MOUNTING)
Note : For 0.5W to 1.5W the terminations will be
tin plated copper φ0.8mm.
For 3W the terminations will be tin plated
copper φ1.0mm
Low Inductance Axial / PCB Mounting
1 Watt To 3 Watts
R 003 To R 10
!
!
OA-1 1W 11 to 15 40 R003 R051 0.5
OA-2 2W 16.3 to 22.5 45 R0041 R068 0.6
OA-3 3W 28 to 35.5 60 R0056 R10 0.7
DIMENSIONS (mm)
L1 LM
RESISTANCE
RANGE TYPICAL
WT PER
PC (gms)
min max
HTR
TYPE POWER
RATING
AT 70°C
OA SERIES (AXIAL)
OP-0.5 0.5W 10.0 7.0 R003 R051 0.3
OP-1 1W 10.0 11.0 R0041 R068 0.4
OP-1A 1W 15.0 9.0 R0041 R068 0.4
OP-1.5 1.5W 10.0 17.5 R0056 R10 0.5
OP-1.5A 1.5W 15.0 15.5 R0056 R10 0.5
OP-1.5B 1.5W 20.0 12.5 R0056 R10 0.5
OP3 3W 10.0 18.0 R0056 R10 0.55
OP3A 3W 15.0 16.0 R0056 R10 0.55
OP3B 3W 20.0 13.0 R0056 R10 0.55
DIMENSIONS (mm) RESISTANCE
RANGE
min max
HTR
TYPE POWER
RATING
AT 70°C P
+1mm H
(max)
TYPICAL
WT PER
PC (gms)
CURRENT SENSE/LOW OHM
CERAMIC ENCASED TYPE
OA/Op
ELECTRICAL AND ENVIRONMENTAL CHARACTERISTICS / DATA
ORDERING INFORMATION
The OA/OP series offer a non insulated - non-inductive resistor having high stability/overload capacity . The tin
plated copper terminals are butt welded to the alloy resistive element forming a very reliable all welded
construction which is finding increasing usage in switching and linear power supplies, instruments, regulators
and other modern current sensing circuits.
For the effective utilisation of these resistors, please refer "Applications / Design notes for current-sense
resistors”.
Due to the nature of their construction these resistors cannot be marked with all relevant details on the
resistive element, however resistance value, tolerance and date code will be marked on the device. All other
relevant details will be on the packing box.
For complete details please refer to marking specifications.
TOLERANCE
RESISTANCE VALUE
HTR TYPE
SERIES
R047 J
OA/OP OA-1/OP-1
Test Performance Requirements
Resistance tolerance +10% [K]; +5% [J]; +3% [H]; +2% [G]; +1% [F]
Rated ambient temperature at 70°C full power dissipation
Insulation resistance Nil
Temperature co-efficient + 200 ppm/ °C to + 1200 ppm/ °C depending on
resistance value and power rating.
(measured from - 55°C to 125°C, referenced to +25°)
Short time overload Max ∆R+1.5%
Moisture resistance Max ∆R+0.5%
Load life Max ∆R+3% (Average)
Ambient operating -40°C to +155°C
temperature range
TYPICAL APPLICATIONS
MARKING
TM
