MF12, MF25 & MF50 Series
Metal Film Resistors
Page 3
10/05/05 V1.0
Characteristics
Test Methods
Limits
Load life in humidity
Resistance change after 1000 hours (1.5 hours "on", 0.5
hour "off") at RCWV in a humidity test chamber controlled at
40°C ±2°C and 90 to 95% relative humidity.
Resistance Value
∆∆R/R
Normal type
±1.5%
Load life
Permanent resistance change after 1000 hours operating at
RCWV with duty cycle of 1.5 hours "on" 0.5 hours "off" at
70°C ±2°C ambient.
Resistance Value
∆∆R/R
Normal type
±1.5%
Terminal strength
Direct Load: Resistance to a 2.5kgs direct load for 10
seconds 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.
No evidence of mechanical damage.
Resistance to
soldering heat
Permanent resistance change when leads immersed to
3.2 - 4.8mm from the body in 350°C ±10°C solder for
3 ±0.5 seconds.
Resistance change rate is ±(1% +0.05
Ω).
No evidence of mechanical damage.
Solderability
The area covered with a new, smooth, clean, shiny and
continuous surface free from concentrated pinholes.
Test temperature of solder
: 235°C ±5°C.
Dwell time in solder
: 3+0.5/-0 seconds.
95% coverage Minimum.
Resistance to
solvent
Specimens shall be immersed in a bath of trichroethane
completely for 3 minutes with ultrasonic.
No deterioration of protective coating and
markings.
RCWV = Rated Continuous Working Voltage =
√ Rated Power X Resistance Value
Performance Specification
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