101SHS100CS6LE datasheet(9/34 Pages) EXXELIA

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CERAMIC CAPACITORS

125

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General characteristics

Page revised 06/20

III.1. Failure Rate Level

The summary of all collected data gives the following results:

• cumulative unit hours in millions: 9.27;

• cumulative unit hours in millions with acceleration factor: 74.16;

• number of defects: 1.

We consider a single sampling plan based on a 90 percent conﬁdence level:

FRSP-90. For this FR sampling plan, MIL-STD- 690D gives the following criteria:

FR Level Symbol

Qualiﬁed FR Level

(% per 1,000 hours)

Number of Failures

Permitted

non-ER

N/A

1.0

1 over 0.389M hours

0.1

1 over 3.89M hours

0.01

1 over 38.9M hours

0.001

1 over 389M hours

EXXELIA Temex therefore complies with the requirements of C, M, P and R

failure rate levels.

S failure rate level according to European Space Agency speciﬁcations

3009/035 and 3009/036.

III.2. Mean Time To Failure

MTTF is the basic measure of reliability for non-repairable items. It is analogous

to the more familiar MTBF (Mean Time Between Failures) used for systems

which can be repaired and placed back in service after failure occurs. FR levels

may be converted to mean time to failure (MTTF) as follows:

MTTF =

, in failure per 106 hours

100 000

FR___level

III.3. Unit Hour Requirement

A complete Poisson distribution table is needed to compute unit hours. To

calculate unit hours with a given number “C” of permitted failures (we are

considering 1 permitted failure) we ﬁrst have to determine the probability of

acceptance P a by subtracting the FRSP value (0.90 as we have selected a

conﬁdence level of 90%) from 1.

Example: Pa = 1 – 0.90 = 0.10

From Poisson’s table and for a Failure Rate level M, we ﬁnd for the parameters

“C” and Pa equal respectively to 1 and 0.10 the corresponding “m” value of

3.89; this “m” value in the table is the total of failure rate l multiplied by the

time (test hours).

M = l x t

unit hours = m ÷ l (1%/1,000hours as we are working with FR level M)

unit hours = 3.89 ÷ 0.00001 = 0.389 million hours (around 45 years)

Values for P, R and S levels are found by multiplying the previous level by 10.

IV. PART FAILURE RATE

The Part Failure Rate as deﬁned by MIL-HDBK- 217F is given by the following

formula:

lp = lb. pCV. pQ. pE

where:

• lb is the Base Failure Rate;

•

pCV is the Capacitance Factor;

•

pQ is Quality Factor;

•

pE is the Environment Factor.

The Part Failure Rate, considering the capacitor series meet the required

FR level, gives the number of failures per 106 hours. In MIL-HDBK-217F, the

values for all these parameters are given under Capacitors, Fixed, Ceramic,

Temperature Compensating and Chip paragraph. The CDR style as described

by MIL-PRF-55681F is taken into account and corresponds to EXXELIA CHA and

CHB sizes.

IV.1. Quality Factor

The Quality Factor depends on the FR level. If we consider the three FR levels

deﬁned previously for EXXELIA multilayer capacitors, the given factors are:

Symbol

Product Level

non-ER

3.0

1.0 % per 1,000 hours

1.0

0.1 % per 1,000 hours

0.3

IV.2. Environment Factor

All part reliability models include the effects of environmental stresses

through the Environmental Factor. The descriptions of these environments are

shown below and encompass the major areas of equipment use

Environment

Description

GB : Ground, Benign

Non-mobile, temperature and humidity controlled envi-

ronments readily accessed to maintenance; includes

laboratory instruments and test equipment, medical

electronic equipment, business and scientiﬁc comput-

er complexes, and missiles and support equipment in

ground silos.

1.0

GF : Ground, Fixed

Moderately controlled environments such as installa-

tion in permanent racks with adequate cooling air and

possible installation in unheated buildings; includes

permanent installation of air trafﬁc control radar and

communications facilities.

2.0

GM : Ground, Mobile

Equipment installed on wheeled or tracked vehicles and

equipment manually transported; includes tactical mis-

sile ground support equipment, mobile communication

equipment, tactical ﬁre direction systems, handheld

communications equipment, laser designations and

range ﬁnders.

10.0

IV.3. Part Failure Rate Calculation

The part failure rate calculated as speciﬁed in MIL-HDBK-217F provides a more

accurate result than the standard failure rate given by a particular FR level.

The two main parameters are the FR level achieved by the standard process –

Quality Factor - and the application where the part will be used – Environment

Factor. Speciﬁc study could be made on request based on customer’s

requirements and equipments.

General Information

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