F
EATURES
• –55°C to +125°C operation
• 50 dB min. attenuation at 500 kHz
differential mode
• 45 dB min. attenuation at 5MHz
common mode
• Compliant to MIL-STD-461C, CE03
• Compatible with MIL-STD-704A
through E
EMI I
NPUT
F
ILTER
28 V
OLT
I
NPUT
S
URFACE MOUNT
FMGA EMI FILTER
0.8 AMP
MODEL
FMGA-461
0.8 amp
Size (max.): 1.010 x 0.880 x 0.250 inches (25.65 x 22.35 x 6.35 mm)
Shown with “Gull Wing” lead option, also available with straight
leads. See Section B8, case B, for dimensions and options.
Weight:
10.3 grams typical, 11.5 grams maximum
Screening: Standard or ES. See Section C2 for screening options, see
Section A5 for ordering information.
DESCRIPTION
Interpoint’s surface mount FMGA-461™ EMI filter has been
designed to work with Interpoint’s surface mount MGA and MGH
Series DC/DC converters. Multiple MGA or MGH Series converters
can be operated from a single FMGA filter provided the total power
line current does not exceed the filter’s maximum rating. The FMGA
filter will reduce the converter’s power line reflected ripple current to
within the limit of MIL-STD-461C, Method CE03 as shown in Figures
4 through 7. The filter uses only ceramic capacitors for reliable high-
temperature operation.
microseconds. The damping circuit can be used with a 1.50
Ω
resistor in series with the filter’s positive input where the additional
line loss can be tolerated. For transients with rise times of greater
than 200 microseconds, there is no overshoot and the damping
circuit is not required.
S
URFACE
M
OUNT
P
ACKAGE
The FMGA EMI filter can be surface mounted with pick-and-place
equipment or manually. It is recommended that the case be
attached with flexible epoxy adhesive or silicone which is thermally
conductive (>1 watt /meter/°K).
Internal components are soldered with SN96 (melting temperature
221°C) to prevent damage during reflow. Maximum reflow tempera-
ture for surface mounting the FMGA filter is 220°C for a maximum
of 30 seconds. SN60, 62, or 63 are the recommended types of
solder. Hand soldering should not exceed 300°C for 10 seconds per
pin.
The hermetically sealed metal cases are available in two different
lead configurations. See Section B8, case B.
C
ONNECTION AND
O
PERATION
Where more than one pin has the same designation (e.g. pins 7, 8,
and 9 are Positive Output), all of those pins must be connected for
output performance to meet the specifications.
The MGA Series has an internal 2 µF capacitor its input terminals
and the MGH Series has an internal 0.47 µF capacitor across its
input power terminals. When the MGA or MGH converters are used
with the FMGA filter, this capacitor becomes part of the filter and
forms its final LC output section. When 2 or 3 MGA or MGH
converters are used with a single filter, this capacitor becomes
larger, improving the rejection versus frequency.
L
AYOUT
R
EQUIREMENTS
T
RANSIENT
D
AMPING
The optional damping circuit shown in Figure 2 will prevent filter
overshoot caused by 80 V transients with rise times of less than 200
The case of the filter must be connected to the case of the converter
through a low impedance connection to minimize EMI.
B3-21
CRANE [ Crane Aerospace & Electronics. ]
