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6.1
STANDARD
PART NUMBER CODING
6.1.1
Fixed resistor coding
Fixed resistor part numbers are as follows.
Fixed resistors
Tolerance
Assistant code
symobl
Rated wattage
(in capital letters)
(in capital letters)
Q
3
@®
©
6
—
[8]
[9]
fro}
[a
1
2
|
Type of resistor
Shape of resistor
Values
{in capital letters)
{in figures)
Rated wattage
Tolerance
Assistant code
Type of resistor (third digit)
(fourth and fifth digits}
(seventh digit)
(twelfth digit)
C
Composition resistors
AO
1/10W
F
41%
A
Small type
D
Carbon film resistors
18°
«1/8W
G
42%
B
Small type
F
—_Unflammable resistors
16
1/6W
J
+5%
S
Small type
G
Oxide metal film
14
1/44W
K
+10%
Y
Lead taping
resistors
12
1/2W
M
+20%
Z
Lead taping
H_—
Fusible resistors
01
1W
M_
Metal plate resistors
02
2W
Values
S
Metal glazed resistors
03
3W
(eighth — tenth or eleventh digits)
V__
Precision metal film
04
4W
examples:
resistors
05
5W
R47
W_
Wire wound resistors
06
6W
4R7
X
Metal film resistors
07
7W
470
47x 10°.
Z
Special resistors
75°
7.5W
471
08
sw
472
10
10W
473
15°
15W
474
AB
16W
475
20
20W
QRV resistance shown by four digits:
30
30W
4640 .
464x 10°
4641.
4642 .
Shape of resistor (sixth digit)
Note: HMM marks are flame retardant resistor.
Type of
.
=|
c
D
F
G
H
mM
s
v
w
x
1
SO
A
SS
an
a a
2
doh
| ch
doh
3
&
=4
=
4
&
me}
Ca]
—s
5
=
{a
(L) type | Mlb
6
|)
Ff
=
Lug
=
7
poh
(B) type
=)
tug
i
8
(A) type
Chip
Lug
9
(C) type
=
=
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