High Power Wire Wound Resistor
9-1773453-2 CIS WR 12/2016
Dimensions in
millimetres unless
otherwise specified
Dimensions Shown for
reference purposes only.
Specifications subject to
change
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Environmental Characteristics:
Natural Resistance change per temperature degree
centigrade.
R-R
-------- x⁶ PPM/°C
Rt-t
R : Resistace alue at roo teperature t
R : Resistace alue at roo teperature +°C t
(Sub-clause 4.8)
±% + .Ω Max. ith o
evidence of mechanical
damage
Permanent resistance change after the application of a
potential of 3 x RCWV for 5 seconds
No evidence of mechanical
damage
Resistance to a 2.5 kgs direct load for 10 secs. in the
direction of the longitudinal axis of the terminal leads
Twist Test :
Terminal leads shall be bent through 90 ° at a point of
about 6mm from the body of the resistor and shall be
rotated through 360° about the original axis of the bent
terminal in alternating direction for a total of 3 rotations
(Sub-clause 4.16)
The area covered with a new smooth, clean, shiny and
continuous surface free from concentrated pinholes.
Test temp. of solder : 245℃ ± 3℃
Dwell time in solder : 2 ~ 3 seconds
(Sub-clause 4.17)
Soldering Temp.
Reference
Electrical Characteristics shall
be satisfied without distinct
deformation in appearance.
Terminals immersed into solder bath to 3.2 ~ 4.8mm
from the body. Permanent resistance change shall be
checked.
Wave soldering condition (2 cycles max.)
Pre-heat : 100 ~ 120 ℃, 30 ± 5sec.
Suggested solder temp.: 235 ~ 255 ℃, 10 sec. (max.)
Peak temp.: 260 ℃
Hand soldering condition:
Hand Soldering bit temp. : 380 ± 10 ℃
Dwell time in solder : 3 +1/-0 sec.
Resistance to
soldering heat
Resistance change rate
±%+.Ω ith o
evidence of mechanical
damage
Permanent resistance change when terminals immersed
to 3.2 ~ 4.8mm from body in 350°C ±10°C solder for
3±0.5 seconds
Resistance change rate
±(5%+ .Ω Max. ith o
evidence of mechanical
damage
Resistance change after 1,000 hours (1.5 hours "on", 0.5
hour "off") at RCWV in a humidity test chamber
controlled at 40 ℃± 2 ℃ and 90 to 95 % relative
humidity
Resistance change rate
±(5%+ .Ω Max. ith o
evidence of mechanical
damage
Permanent resistance change after 1,000 hours
operating at RCWV with duty cycle of (1.5 hours "on",
0.5 hour "off") at 70℃ ± 2℃ ambient
