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F-3114C 1/08

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.

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

Voltage

50V, 100V

200V

500V

Bias = 0V

±15%

Bias = Vr

+15%, -25%

+15%, -40%

+15%, -50%

http://www.dscc.dla.mil/Downloads/MilSpec/Docs/MI

L-PRF-49470/prf49470ss2.pdf

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

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%

Bias = Vr

+15%, -25%

+15%, -40%

+15%, -50%

MIL-PRF-49470 SMPS Stacked Capacitors

MIL-PRF-49470 ORDERING INFORMATION

M49470

Performance

Specification

indicating

MIL-PRF-49470

Characteristic

(1.2.1.1)

Performance

Specification

sheet number

(indicating

MIL-PRF-

49470/1)

474

Capacitance

(1.2.1.2)

Capacitance

Tolerance

(1.2.1.3)

Rated

Voltage

(1.2.1.4)

Configuration

(see 1.2.1.5)

KEMET ORDERING INFORMATION

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%, -25%

+15%, -40%

+15%, -50%

106

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

Qty per Small Box

7.5” x 7.5” Box Size

Qty per Large Box

13.0” x 13.0” Box Size

104

144

225