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MIL-PRF-19978 Capacitors, Fixed, Plastic \(Or Paper-Plastic\) Dielectric \(Hermetically Sealed In Metal, Ceramic Or Glass Cases\), Established And Non-Established Reliability General Specification ForThis specification covers the general requirements for established reliability \(ER\) and non-established reliability \(non-ER\), direct current \(dc\), plastic or paper-plastic dielectric, fixed capacitors, hermetically sealed in metal or ceramic or glass cases. Capacitors meeting the established reliability requirements specified herein have failure rate \(FR\) levels ranging from 1.0 percent to 0.001 percent per 1,000 hours \(see 1.2.1.9\). These FRLs are established at a 90-percent confidence level and maintained at a 10-percent producer\'s risk and are based on life tests performed at maximum rated voltage and maximum rated temperature. An acceleration factor of 5:1 has been used to relate the life test data obtained at 140 percent of rated dc voltage at the applicable high test temperature to the rated voltage at the applicable high test temperature. This specification also covers removable mounting retainers for use with applicable capacitors \(see 3.1\). A parts per million \(ppm\) quality system is used for documenting and reporting the average outgoing quality of ER capacitors supplied to this specification. Statistical process control \(SPC\) techniques are required in the manufacturing process to minimize variation in production of ER capacitors supplied to the requirements of this specification.

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MIL-PRF-19978K
1.2.1.5 Voltage. The dc voltage rating for continuous operation at the high ambient test temperature specified in
table III (except for characteristic K which is for +85C operation), is identified by a single letter in accordance with
table IV.
TABLE IV. DC voltage rating.
DC voltage rating 1/
DC voltage rating 1/
Symbol
Symbol
(Volts)
(Volts)
Z
30
K
2,500
A
50
L
3,000
B
100
M
4,000
C
200
N
5,000
D
300
P
6,000
E
400
R
7,500
F
600
S
10,000
G
1,000
T
12,500
H
1,500
U
15,000
J
2,000
1/ For characteristic K, voltage derating may be necessary at the high
ambient test temperature (see 3.1).
1.2.1.6 Capacitance. The nominal capacitance value expressed in picofarads (pF) is identified by a three-digit
number; the first two digits represent significant figures and the last digit specifies the number of zeros to follow.
1.2.1.7 Capacitance tolerance. The capacitance tolerance in percent is identified by a single letter in accordance
with table V.
TABLE V. Capacitance tolerance.
Capacitance tolerance
Symbol
percent ()
F
1
G
2
J
5
K
10
1.2.1.8 Vibration grade. The vibration grade is identified by a single digit in accordance with table VI.
TABLE VI. Vibration grade.
Symbol
Frequency range (Hz)
Acceleration (G)
1
10 to 55 inclusive
---
3
10 to 2,000 inclusive
15
1.2.1.9 Product level designator. The product level designation in percent per 1,000 hours is identified by a single
letter in accordance with table VII, and is based on rated voltage at the high test temperature, as applicable.
TABLE VII. Product level designator.
Product level
Symbol
(percent per 1,000 hours)
1.0
M
0.1
P
0.01
R
0.001
S
3



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