#SMD Fuse Markings Guide

Complete reference for identifying surface-mount fuses by markings, packages, and specifications across multiple manufacturers.

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Bourns SMD Fuses

Marking Current Rating
D 315mA
F 500mA
V 750mA
K 800mA
L 1A
M 1.25A
P 1.5A
N 1.6A
S 2A
T 2.5A
3 3A
U 3.15A
W 4A

Littelfuse SMD Fuses

Marking Current Rating (A) Voltage Rating (V) Package Size Breaking Capacity Response Type
01 0.5 32 0603 50A Fast-acting
02 1.0 32 0603 50A Fast-acting
03 1.5 32 0603 50A Fast-acting
04 2.0 32 0603 50A Fast-acting
Marking Current Rating (A) Voltage Rating (V) Package Size Breaking Capacity Response Type
L1 0.5 24 0603 35A Fast-acting
L2 1.0 24 0603 35A Fast-acting
L3 1.5 24 0603 35A Fast-acting
L4 2.0 24 0603 35A Fast-acting
Marking Current Rating (A) Voltage Rating (V) Package Size Breaking Capacity Response Type
M1 3.0 32 1206 100A Fast-acting
M2 4.0 32 1206 100A Fast-acting
M3 5.0 32 1206 100A Fast-acting
M4 6.0 32 1206 100A Fast-acting

Bel SMD Fuses

Marking Package Current Rating Voltage Rating (DC) Speed Package Color Datasheet
NO MARKING
(On Packaging)		 0402 - 32V Fast Blow White View
Marking Package Current Rating Voltage Rating (DC) Speed Package Color Datasheet
B 0603 1A 32V Slow Blow Green View
H 0603 1.5A 32V Slow Blow Green View
K 0603 2A 32V Slow Blow Green View
L 0603 2.5A 32V Slow Blow Green View
O 0603 3A 32V Slow Blow Green View
R 0603 3.5A 32V Slow Blow Green View
S 0603 4A 32V Slow Blow Green View
T 0603 5A 32V Slow Blow Green View
V 0603 6A 32V Slow Blow Green View
X 0603 7A 32V Slow Blow Green View
Z 0603 8A 32V Slow Blow Green View
Marking Package Current Rating Voltage Rating (AC/DC) Speed Package Color Datasheet
F 0603 300mA 32V/63V Fast Blow White/Blue View
J 0603 500mA 32V/63V Fast Blow White/Blue View
M 0603 750mA 32V/63V Fast Blow White/Blue View
1 0603 1A 32V/63V Fast Blow White/Blue View
P 0603 1.25A 32V/63V Fast Blow White/Blue View
R 0603 1.5A 32V/63V Fast Blow White/Blue View
2 0603 2A 32V/63V Fast Blow White/Blue View
T 0603 2.5A 32V/63V Fast Blow White/Blue View
3 0603 3A 32V/63V Fast Blow White/Blue View
Z 0603 3.5A 32V/63V Fast Blow White/Blue View
4 0603 4A 32V/63V Fast Blow White/Blue View
5 0603 5A 32V/63V Fast Blow White/Blue View
6 0603 6A 32V/63V Fast Blow White/Blue View
7 0603 7A 32V/63V Fast Blow White/Blue View
8 0603 8A 32V/63V Fast Blow White/Blue View
Marking Package Current Rating Voltage Rating (AC/DC) Speed Package Color Datasheet
E 1206 250mA 125V/63V Fast Blow White View
H 1206 375mA 125V/63V Fast Blow White View
J 1206 500mA 125V/63V Fast Blow White View
M 1206 750mA 125V/63V Fast Blow White View
1 1206 1A 125V/63V Fast Blow White View
P 1206 1.25A 125V/63V Fast Blow White View
R 1206 1.5A 125V/63V Fast Blow White View
2 1206 2A 125V/63V Fast Blow White View
T 1206 2.5A 125V/63V Fast Blow White View
3 1206 3A 125V/63V Fast Blow White View
z 1206 3.5A 125V/63V Fast Blow White View
4 1206 4A 125V/63V Fast Blow White View
5 1206 5A 125V/63V Fast Blow White View
6 1206 6A 125V/63V Fast Blow White View
7 1206 7A 125V/63V Fast Blow White View
8 1206 8A 125V/63V Fast Blow White View
Marking Package Current Rating Voltage Rating (AC/DC) Speed Package Color Datasheet
TM 1206 750mA 63V/63V Slow Blow White View
T1 1206 1A 63V/63V Slow Blow White View
TP 1206 1.25A 63V/63V Slow Blow White View
TR 1206 1.5A 63V/63V Slow Blow White View
T2 1206 2A 63V/63V Slow Blow White View
TT 1206 2.5A 63V/63V Slow Blow White View
T3 1206 3A 63V/63V Slow Blow White View
TZ 1206 3.5A 63V/63V Slow Blow White View
T4 1206 4A 63V/63V Slow Blow White View
T5 1206 5A 63V/63V Slow Blow White View
Marking Package Current Rating Voltage Rating (DC) Speed Package Color Datasheet
2 1206 2A 50V Fast Blow White View
T 1206 2.5A 50V Fast Blow White View
3 1206 3A 50V Fast Blow White View
Z 1206 3.5A 50V Fast Blow White View
4 1206 4A 50V Fast Blow White View
5 1206 5A 50V Fast Blow White View
6 1206 6A 50V Fast Blow White View
7 1206 7A 50V Fast Blow White View
8 1206 8A 50V Fast Blow White View
10 1206 10A 50V Fast Blow White View
12 1206 12A 50V Fast Blow White View
15 1206 15A 50V Fast Blow White View
20 1206 20A 50V Fast Blow White View
25 1206 25A 50V Fast Blow White View
30 1206 30A 50V Fast Blow White View
40 1206 40A 50V Fast Blow White View
50 1206 50A 50V Fast Blow White View
Series Marking Package Current Rating Voltage Rating (AC/DC) Speed Package Color Datasheet
C1H 10 1206 10A 125V/32V Fast Blow White View
C1H 12 1206 12A 125V/32V Fast Blow White View
C1H 15 1206 15A 125V/32V Fast Blow White View
C1H 20 1206 20A 125V/32V Fast Blow White View
C1H 25 1206 25A 125V/32V Fast Blow White View
C1H 30 1206 30A 125V/32V Fast Blow White View
C1Q NO MARKING 1206 - 125V/63V Fast Blow White View
C2Q NO MARKING 0603 - 32V/63V Fast Blow White/Blue View

SMD Fuse Package Types

Visual reference guide for common SMD fuse package sizes and their dimensions.

0402

0402 Package

Length: 1.0mm (0.039")
Width: 0.5mm (0.020")
Height: 0.35mm (0.014")
Common Ratings: 0.25A - 0.5A
0603

0603 Package

Length: 1.6mm (0.063")
Width: 0.8mm (0.031")
Height: 0.45mm (0.018")
Common Ratings: 0.5A - 8.0A
0805

0805 Package

Length: 2.0mm (0.079")
Width: 1.25mm (0.049")
Height: 0.5mm (0.020")
Common Ratings: 1.0A - 3.0A
1206

1206 Package

Length: 3.2mm (0.126")
Width: 1.6mm (0.063")
Height: 0.55mm (0.022")
Common Ratings: 1.5A - 30.0A
1210

1210 Package

Length: 3.2mm (0.126")
Width: 2.5mm (0.098")
Height: 0.55mm (0.022")
Common Ratings: 5.0A - 10.0A
1812

1812 Package

Length: 4.5mm (0.177")
Width: 3.2mm (0.126")
Height: 0.6mm (0.024")
Common Ratings: 8.0A - 15.0A
2920

2920 Package

Length: 7.3mm (0.287")
Width: 5.0mm (0.197")
Height: 0.7mm (0.028")
Common Ratings: 10.0A - 20.0A

Additional Information

Surface-mount fuses are identified by their markings, which often include alphanumeric codes that indicate the current rating and sometimes the series or response type. The marking style varies between manufacturers, with some using simple codes like "F1.0" (indicating a 1.0A fuse) and others using more complex coding schemes.

Identification Tips

When identifying an SMD fuse:

  1. Check the package size first (0603, 1206, etc.)
  2. Look for markings on the top surface
  3. If no clear marking is found, measure dimensions precisely
  4. Reference manufacturer datasheets for specific coding patterns