KEMET is now on the QPL list for Switch Mode
Power Supply (SMPS) Military Stacked Capacitors
with MIL-PRF-49470 standard B Level reliability
availability. These devices are intended for high
reliability SMPS and pulse energy applications.
Their low Equivalent Series Resistance (ESR) and
Equivalent Series Inductance (ESL) make them ide-
ally suited for input and output filtering of power sup-
ply applications as well as snubber applications.
The multilayer construction also creates high ther-
mal transfer functions, resulting in very little temper-
ature rise for the generated power giving the capac-
itors excellent high current handling capability.
The performance benefits of ceramic are being
realized in many applications that were heretofore
unavailable to these capacitors. The replacement
of larger capacitance electrolytic capacitors with
smaller value ceramics is a common occurrence
today, but there are still some larger capacitance
values required of the MLCC.
The capacitors are constructed using large chip
sizes, much larger than those available for standard
surface-mount applications. Because they are so
contact to the board is through a pin structure.
The pin structure located at the bottom of the lead-
frame consists of multiple pins at 100 mil centers.
The formation of these pins can be surface mount-
able styles "L" and "J" (or gull-wing), or as through-
hole insertion pins style "N."
This multi-pin arrangement allows the
extremely low ESR and ESL of the chip package
to be presented to the circuit without any signifi-
cant increases. This arrangement also allows a
very efficient thermal transfer path to exist
between the chip package and the PC board, as
most of the thermal dissipation for this package
will be through the leadframe connection.
These capacitors are available in case codes
3, 4, & 5. They are available in X7R dielectric, in
voltage ranges from 50 VDC to 500 VDC. The
chip stack is horizontal and the leadframe attach-
ment is a high-temperature solder. They are also
available as unpotted bare chips or as a potted
assembly. MIL-PRF-49470 and DSCC drawing
87106 (X7R) are used to establish a baseline part
for high-reliability applications.
MLC
Chip
Leadframe
'J' Form
Leadframe
large, mounting these devices directly to the PC
board would more than likely generate cracking
because of straight mechanical strain, or strain
which occurs because of mismatches in CTE (coeffi-
cient of thermal expansion) between the board and
the ceramic.
This strain is proportional to the distance be-
tween the termination pads on the PC board and
results in an increasing propensity for failure
among the larger SMT chips. The leadframe is
attached to the chip stack (from singular to multiple
chips) and creates a mechanical relief between the
ceramic device and the board, so they are not
bound to each other. The contact to the chips is
usually a perforated, vertical, metal plate while the
Capacitance values at 50 VDC are available
up to 47
μF
(X7R). Care must be exercised when
using the bare chips to ensure there can be no
mechanical damage imposed on the mounted
parts, although the potted devices reduce this
potential dramatically.
Larger Case codes 1, 2, & 6 will be available
for order in Q3CY08. The T level high reliability
space level version will be available in calendar
year 2009.
2
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
MIL-PRF-49470 SMPS Stacked Capacitors
KEMET is qualified to supply MIL-PRF-
49470/1 unencapsulated X7R Case Codes 3, 4, &
5 ceramic SMPS capacitors in voltage ratings 50V,
100V, 200V, and 500V. KEMET is also qualified to
supply MIL-PRF-49470/2 encapsulated X7R Case
Codes 3, 4, & 5 ceramic SMPS capacitors in volt-
age ratings 50V, 100V, 200V, and 500V.
The DSCC drawing 87106 has been cancelled
(
h t t p : / / w w w. d s c c . d l a . m i l / D o w n l o a d s /
MilSpec/DsccDwg/87106.pdf).
However, KEMET
is able to supply to the DSCC 87106 drawing per
customer request. KEMET will supply to the
DSCC 87106 drawing with an exception taken to
performing Group B Inspections on a per lot basis.
Per DSCC drawing section 4.2.2 the acquiring
activity, at its discretion, may accept a certificate of
compliance (CofC) with Group B inspections in
lieu of performing Group B inspections. KEMET
87106 orders will include the CofC stating compli-
ance to the 87106 requirements. KEMET's MIL-
PRF-49470 QPL status confirms KEMET's compli-
ance to the Group B testing requirements.
The MIL-PRF-49470 capacitors are preferred
over the DSCC drawing 87106 capacitors as out-
lined in NASA's Electronic Parts and Packaging
website:http://nepp.nasa.gov/npsl/Capacitors/
87106/87106aps.htm.
The M49470 military spec-
ification product provides additional quality assur-
ance provisions that are not required by the DSCC
drawing. These extra provisions helped to create a
more robust replacement for the 87106 capacitors.
MIL-PRF-49470 Requirements:
Electrical Specifications
Rated Voltage:
50V, 100V, 200V, 500V
Voltage-Temperature Coefficient:
Capacitance:
Measured in accordance with
method 305 of MIL-STD-202 (1kHz ± 100Hz at
1.0Vrms ± 0.2Vrms open circuit voltage).
Dissipation Factor:
Dissipation factor measured
at same conditions as capacitance measure-
ment. For X7R capacitors DF maximum is 2.5%.
Insulation Resistance:
• @25°C, rated voltage 100GΩ or
1,000MΩ-μF, whichever is less
• @125°C, rated voltage 10GΩ or
100MΩ-μF, whichever is less
Dielectric Withstanding Voltage (DWV):
DWV will be tested at 250% of rated voltage
except for 500V rated parts which will be
tested at 150% of rated voltage.
Performance Requirements:
Reference KEMET Stacked Capacitor Test Methods
(Page 18) for the Group A and Group B test require-
ments per MIL-PRF-49470.
DSCC Website links:
DSCC Website related to MIL-PRF-49470 dimen-
sional, electrical, physical, testing and part number
options:
http://www.dscc.dla.mil/Downloads/MilSpec/Docs/MI
L-PRF-49470/prf49470.pdf
DSCC Website for 49470/1 SMPS Capacitors
http://www.dscc.dla.mil/Downloads/MilSpec/Docs/MI
L-PRF-49470/prf49470ss1.pdf
DSCC Website for 49470/2 SMPS Capacitors
Dielectric
BX
BR
BQ
Voltage
50V, 100V
200V
500V
Bias = 0V
±15%
±15%
±15%
Bias = Vr
+15%, -25%
+15%, -40%
+15%, -50%
http://www.dscc.dla.mil/Downloads/MilSpec/Docs/MI
L-PRF-49470/prf49470ss2.pdf
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
3
Ordering Information Requirements per 87106
DSCC Drawing:
The contract or purchase order should specify the
following:
1. Complete Military Part Number
Drawing #: 87106 Dash Number XXX
(Example: 87106-001)
2. Requirements for Delivery of one copy of
the conformance inspection data or cer-
tificate of compliance that parts have
passed conformance inspection with
each shipment of parts by the manufac-
turer. (KEMET will provide a CofC with
each shipment as standard practice)
3. Requirements for packaging and pack-
ing. (KEMET will provide capacitors in a
cardboard box with foam inserts as standard
practice)
*4. Whether the manufacturer performs the
group B inspections, or provides certifi-
cation of compliance with Group B
inspections.
*(KEMET will only offer the CofC option.
KEMET will not perform Group B inspec-
tions on a per lot basis. KEMET's stan-
dard CofC will include notification of con-
formance to Group B inspections.)
5. Requirements for notification of change of prod-
uct to acquiring activity, if applicable.
Electrical Specifications
Operating Temperature Range:
The operating temperature range is -55°C to
125°C.
Rated Voltage:
50V, 100V, 200V, 500V
Temperature Coefficient:
Dielectric
BX
BR
BQ
Capacitance:
Measured in accordance with
method 305 of MIL-STD-202 (1kHz±100Hz
at 1.0Vrms ± 0.2Vrms open circuit voltage).
Dissipation Factor:
Dissipation factor mea-
sured at same conditions as capacitance mea-
surement. For X7R capacitors DF maximum is
2.5%.
Insulation Resistance:
• @25°C, rated voltage: 100GΩ or
1,000MΩ-μF, whichever is less
• @125°C, rated voltage: 10GΩ or
100MΩ-μF, whichever is less
Dielectric Withstanding Voltage (DWV):
DWV will be tested at 250% of rated volt-
age except for 500V rated parts which will
be tested at 150% of rated voltage.
Performance Characteristics & Test Methods:
The following tests are in accordance with MIL-PRF-
49470
1. Thermal Shock & Voltage Conditioning
2. Solderability
3. Vibration, high frequency
4. Immersion
5. Shock, specified pulse
6. Moisture resistance
7. Resistance to soldering heat
8. Resistance to solvents
9. Life
Marking:
Marking shall be in accordance with MIL-
STD-1285, except the parts shall be marked with
the part number as specified in paragraph 1.2 of
87106 with the manufacturer's name or code and
date code minimum. Case sizes 4 & 5 shall be
marked with coded cap and tolerance minimum.
Full marking shall be included on the package.
DSCC Website Notification of 87106
Cancellation:
http://www.dscc.dla.mil/Downloads/MilSpec/
DsccDwg/87106.pdf
Voltage
50V, 100V
200V
500V
Bias = 0V
±15%
±15%
±15%
Bias = Vr
+15%, -25%
+15%, -40%
+15%, -50%
4
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
MIL-PRF-49470 SMPS Stacked Capacitors
MIL-PRF-49470 ORDERING INFORMATION
M49470
Performance
Specification
indicating
MIL-PRF-49470
R
Characteristic
(1.2.1.1)
01
Performance
Specification
sheet number
(indicating
MIL-PRF-
49470/1)
474
Capacitance
(1.2.1.2)
K
Capacitance
Tolerance
(1.2.1.3)
C
Rated
Voltage
(1.2.1.4)
N
Configuration
(see 1.2.1.5)
KEMET ORDERING INFORMATION
L1
Product Family
L1 = Unencapsulated
L2 = Encapsulated
Temperature
Characteristic
Dielectric
X = BX (50V & 100V)
R = BR (200V)
Q = BQ (500V)
Cap Change
Without Voltage With Voltage
±15%
±15%
±15%
+15%, -25%
+15%, -40%
+15%, -50%
R
N
30
C
106
K
S
12
Maximum Height
Encapsulated
27 = 0.270”
39 = 0.390”
53 = 0.530”
66 = 0.660”
80 = 0.800”
(A dim)
Unencapsulated
12 = 0.120”
24 = 0.240”
36 = 0.360”
48 = 0.480”
65 = 0.650”
Lead Type
N = Straight pin lead; J = Formed J lead;
L = Formed L lead
Case Code
30 = Case code 3
40 = Case code 4
50 = Case code 5
Voltage Code
5 = 50 VDC
2 = 200 VDC
1 = 100 VDC C = 500 VDC
Test Level
B = MIL-PRF-49470 “B” Level
*C = 87106
S = Standard
X = Special
Capacitance Tolerance
K = ±10%
M = ±20%
Capacitance
First two digits represent significant figures.
Third digit specifies number of zeros.
106 = 10
μF
* 4.2.2 Certification: The acquiring activity, at its discretion, may accept a certificate of compliance
with group B inspections in lieu of performing group B inspections (see 6.1.3 for guidance).
STACKED MLCC SHIPPING CONTAINER PART QUANTITIES
Case Code
3
4
5
Qty per Small Box
7.5” x 7.5” Box Size
Qty per Large Box
13.0” x 13.0” Box Size
28
36
64
104
144
225
5
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
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