SMM
SNAP MOUNT 85C
SMM SERIES
Engineering Bulletin Mar 07
SMM Series
Snap Mount
Downsize
High Voltage
Long Life
RoHS
Compliant
85C
Maximum
Temperature
The SMM series is a high voltage, long life snap-in capacitor series that offers downsized versions
of the SMH series. Compared to our SMH series, the SMM capacitors have a longer rated lifetime
of 3,000 hours with the full rated ripple current applied and are also one case size smaller than
equivalently rated SMH capacitors. These characteristics allow downsizing for many power supplies
and will provide better reliability due to increased life. The SMM capacitors are available in 2 or 4-pin
snap-in styles and 4-pin straight terminals. The SMM series capacitors are RoHS compliant offering
Pb-free construction.
The standard SMM series capacitors are not solvent proof. Refer to guidelines and precautions on the
website for usage and installation conditions recommended for United Chemi-Con products.
Summary of Specifications
PC board 2 or 4-pin snap-in; optional 4-pin straight terminals.
Capacitance range: 47 to 3,300F.
Voltage range: 160 to 450VDC.
Category temperature range: 25Cto 85C.
Leakage current: 3 CV (A) maximum after 5 minutes at 20C.
Standard capacitance tolerance: 20%
Nominal case size (DL): 2025mm to 3550mm.
Rated lifetime: 3,000 hours at 85C with the rated ripple current applied.
United Chemi-Con, Inc. 9801 W. Higgins Road, Rosemont, IL 60018 Tel 847-696-2000 Fax 847-696-9278 www.chemi-con.com 1/11Engineering Bulletin Mar 07
SMM Series
SMM Specifications - Snap Mount
Item Characteristics
Category Temperature Range 25 to 85C
Rated Voltage Range 160 to 450VDC
Capacitance Range 47 to 3,300F
Capacitance Tolerance 20% (M) at 20C, 120Hz
Leakage Current I 3 CV (A) after 5 minutes at 20C.
Where I = Max. leakage current (A), C = Nominal capacitance (F) and V= Rated voltage (V)
Dissipation Factor (Tan )At 20C, 120Hz
Rated Voltage (V) 160-400 420-450
Tan (DF) Max. 0.15 0.20
Low Temperature At 120Hz, impedance (Z) ratio between the25C value and20C value shall not exceed
Characteristics the values given below.
Rated Voltage (V) 160-400 420-450
Z( 25C) /Z( 20C) 4 8
Rated Ripple Current Multipliers Ambient Temperature (C)
45C 60C 70C 85C
1.73 1.50 1.32 1.00
Frequency (Hz)
DC Rated Voltage 50Hz 120Hz 300Hz 1kHz 10kHz 50kHz
160-250V 0.81 1.00 1.17 1.32 1.45 1.50
315-450V 0.77 1.00 1.16 1.30 1.41 1.43
Endurance The following specifications shall be satisfied when the capacitors are restored to 20C after
(Load Life) subjecting them to DC voltage for 3,000 hours at 85C with the rated ripple current applied.
The sum of the DC voltage and peak AC voltage must not exceed the full rated voltage of
the capacitors.
Capacitance change: 20% of initial measured value
Tan (DF) : 200% of initial specified value
Leakage current : initial specified value
Shelf Life The following specifications shall be satisfied when the capacitors are restored to 20C after
exposing them for 1,000 hours at 85C without voltage applied. The rated voltage shall be
applied to the capacitors for a minimum of 30 minutes, at least 24 hours and not more than
48 hours before the measurements.
Capacitance change: 15% of initial measured value
Tan (DF) : 150% of initial specified value
Leakage current : initial specified value
2/11 United Chemi-Con, Inc. 9801 W. Higgins Road, Rosemont, IL 60018 Tel 847-696-2000 Fax 847-696-9278 www.chemi-con.com
SMM
SNAP MOUNT 85C