Type MLSH 125 °C Hermetic Slimpack, Aluminum Electrolytic Capacitor
High Reliability Test/Burn-in
Ripple Current Capability
The specimens, while deenergized or operating under the load conditions
specified, shall be subjected to the vibration amplitude, frequency range,
and duration specified for each case size.
The specimens shall be subjected to a simple harmonic motion having an
amplitude of either 0.06-inch double amplitude (maximum total excursion)
or peak level specified above, whichever is less. The tolerance on vibration
amplitude shall be ±10 percent.
The vibration frequency shall be varied logarithmically between the
approximate limits of 10 to 2,000 Hz.
Sweep Time and Duration
The entire frequency range of 10 to 2,000 Hz and return to 10 Hz shall be
traversed in 20 minutes. This cycle shall be performed 12 times in each
of three mutually perpendicular directions (total of 36 times), so that
the motion shall be applied for a total period of approximately 12 hours.
Interruptions are permitted provided the requirements for rate of change
and test duration are met.
Established Reliability capacitors shall be subjected to a minimum of 100
percent of the DC rated voltage at 85 ºC for 48 hours minimum but not to
exceed 96 hours. During this test, capacitors shall be adequately protected
against temporary voltage surges of 10 percent or more of the test voltage.
After burn-in, the capacitors shall be returned to room ambient conditions
and the DC leakage, capacitance, and ESR shall be measured with respect
to specified limits.
Large Sides Case Length
Case JK - 32g
18 AWG copper wire with 60/40 tin-lead electroplate, 20 amps max
The ripple current capability is set by the maximum permissible internal
core temperature, 125 ºC.
The ripple currents in the ratings tables are for 85 ºC case temperatures.
For air temperatures without a heatsink use the multipliers for Ambient
Temperature, No Heatsink.
Temperature rise from the hottest internal spot, the core, to ambient air is
∆T = I2(ESR)(θcc + θca), recommended max ∆T of 30 ºC
where θcc is the thermal resistance from core to case and θca from case to
ambient. To calculate maximum ripple capability with the MLSH attached to
a heatsink use the maximum core temperature and the values for θcc.
As an illustration, suppose you operate an noninsulated
MLSH172M050JK0C in 95 ºC air and attach it to a commercial heatsink
with a free-air thermal resistance of 2.7 ºC/W. Use a good thermal grease
between the MLSH and the heatsink, and the total thermal resistance is 2.7
+6. 6 or 9.3º C/W. The power which would heat the core to 125 °C is (125 -
95)/9. 3 or 3.2 W. For an ESR of 108 mΩ, 3.2 W equates to a ripple current of
CDM Cornell Dubilier • 140 Technology Place • Liberty, SC 29657 • Phone: (864)843-2277 • Fax: (864)843-3800