SECTION 032-120-101
Issue 3, March, 1956
AT&T Co Standard
BELL.SYSTEM PRACTICES
Planf Series
FIXED CAPACITORS
AND
FIXED RESISTORS
(KS-SPEC., MIL OR JAN,
COLOR CODES AND
J*
RETMA)
REFERENCE DATA
1.04
GENERAL
1.01
This section provides a meams of decoding the colored spots and colored
bands on certain types of the above aPparatus. This apparatus 1s small and, except
for the button-style capacitors, is mounted
by means of integral (pigtail) wire leads
or terminals. The capacitors have a dielectric of paper, mica, or ceremlc. The
resistors are of the low-power type and
are either tire-wound or ccsnposltiontype.
Compoaition-type resistors do not
necessarily retain their resistance
values with time, varying atmospheric conditions, and as a result of heating during
the soldering operation. Care always should
be taken In soldering resistors, since
their ohmic value may be seriously affected
by excessive heating. Soldering coppers
should not be applied too close to a resistor body or for too long a time.
2.
This section has been reissued to include the color-coding arrangement
used on button-type mica capacitors and to
modify the tolerance requirements of KScomposition resistors. The color-coding
standard now known as RETMA was formerly
known as MA.
DECODING
1.02
2.01
Specific information for decoding the
colors, etc., is shown In Tables A,
B, C, and D, as follows:
Table
1.03 MIL (formerly JAN) indicates the
standard that has been adopted by the
Military Services. RETMA indicates the
standard that has been adopted by the RadioElectronics-Television Manufacturers
Aaaociation.
A
B
;
AD
paratus
Capacitors, Mica or Paper Dielectric
Capacitors, Ceramic Dielectric
Resistors, KS- Spec.
Resistors, Composition and Low Power,
Wire Wound
Copyright, 1956, by American Telephone and Telegraph Company
Printed in U. S. A.
Page 1
SECTION 032-120-101
TABLE
-
CAPACITORS
Dielectric
MICA
(Note
1)
(Note
2)<
*
Characteristic
A
OR
●
PAPER
**
~Multi
Tolerance~
MICA
COLOR
OF SPOT
DIELECTRIC,
plier
BUTTON
e
Read
in
clockwise
direction
DIELECTRIC
STYLES
0 lack
First
-Second
0)
Digit
Digit
o
SIGNIFICANCE
OF FIRST
TWO OIGITS
—Multiplier
—Tolerance
Characteristic
MULTIPLIER
(SEE NOTE
Black
o
1
Brown
1
10
Red
2
100
1000
Orange
3
Yellow
b
Green
5
Blue
6
Violet
7
Gray
8
White
9
Gold
o. I
Si lver
0.01
(Note
3) TOLERANCE
i20%
*5$
*1O$
NOTES
Page 2
1.
Silver
_ paper;
black
2.
The characteristic
design
considerations
Colors
should
match
3.
The multiplier
is
shall
be multiplied
micromicrofarads.
-mica
(MIL);
white
is
a factor
entering
and has
therefore
when
replacing.
the
to
factor
obtain
by which
the
the
nominal
-mica
(RETMA).
primarily
not
been
into
included.
first
two
capacitance
digits
in
2)
1SS 3 SECTION O32-12O-1O1
TABLE
CAPACITORS
Characteristic
-
B
CERAMIC
DIELECTRIC
(Note
2~
““:::~:;;fi~:::::::fier
(N0te3)
(Note
+
1)
Inner
Electrode
Terminal
Characteristic
First
(Note
2)
Oigit
Second
Digit
Multiplier
Tolerance
MIL
TOLERANCE
Nom.
SI$:I:::::CE
COLQR
TWO OIGITS
B lack
o
2
100
Orange
3
1000
Yellow
4
Green
5
Blue
6
Violet
7
8
9
Per
Cent
*2O
S?.o
*1
*0.1
10
1
Red
Gray
4)
1
Brown
Whi te
Less
MULTIPLIER
(See
Note
Capacitance
Over
or
10 UUF
*
*3
10,OOO
*5
*0.5
Ioo,ooo
0.01
0.1
M.25
*IO
*1.O
NOTES
1.
Coio*ed
2.
The characteristic
is a factor
Gnterlng
Primarily
into
design
considerations
and has therefore
not
been
included.
Colore
should
match
when
replacing.
Sometimee
omitted
on
KS-Spec.
HI-K
ceramice.
spots
3.
When
side.
4.
The multiplier
is
shall
be multiplied
micromicrofarads.
spots
are
or
colored
used,
bands
a black
the
to
factor
obtain
may
spot
be
is
used.
applied
by which
the
the
nominal
on
the
first
two
capacitance
opposite
digits
in
Pago 3
SECTION 032-120-101
3!BLUL
RESISTORS
-
POWER
RATINGS
ANO
TOLERANCES
POWER RATING
(watts)
TYPE
KS-1349(3
KS-13491
KS-13492
1/2
I
2
LONG-TERM
OPERATION
TOLERANCE
(NOTE
1)
AFTER
SHOPINSTALLATION
OR SHELF-AGING
I N~T~AL
LIST
NO.
FOR ABOVE
RESISTORS
ON KS-SPEC.
TOLERANCE
LI
=$
-20
to
+3*
L2
●l@
-13
to
+16$
-25
to
+35$
L3
*M
-23
to
+26$
-35
to
+45$
-B to
+11$
NOTES
1,
Tha
ment
tolarancas
of resistors
in
this
column
should
be
in non critical
paths.
TABLE
RESISTORS
-
COMPOSITION
noted
before
replace-
O
ANO LOW
POWER,
,—.
WIRE
WOUNO
klultiplier
Tolerance
a
First
Digit
(Note
Second
1)~
/
Digit~
SIGNIFICANCE
OF FIRST
TWO OIGITS
COLOR
OF BAND
B lack
o
I
Rrnwn
K30Cq
I
Whi te
Gold
Iver
I,ooo,oool
I
10.000.OCOI
7.
Gray
i
Ioo.0001
6
I
Violet
I
Io,oool
I
5
Blue
I
Iool
I
4
I
Green
I Si
Inl
3
Yellow
2~
1]
I
2
I
Orange
I
3)
1
Red
TOLERANCE
(Sac
Note
MULTIPLIER
~e
8
I
9
1
I
I
I
I
{
I
Ioo,ooo,oool
I,ooo,ooo,oool
o. I
0.01
I
1
No Color!
*5$
I
*1O%
ew
I
NOTES
Page
4
4
Pages
1.
Oouble-width
resistor.
2.
See
3.
The multiplier
is
shall
be multiplied
Table
band
C for
signifies
tolerances
the
factor
to obtain
low-power,
of
KS-Spec.
fixed,
wire-wound
composition
by which
the
the
nominal
first
two
resistance
resistors.
digits
in ohms.