BEL SMM25

3812 Size
Type SMM
RoHS6 Compliant
Square Ceramic Surface Mount Medium Blow Fuse
Pb
SMMD Sept.,2010
Catalog Ampere Typical Cold Volt-drop
Number Rating Resistance @100% In
(ohm)
Melting I²t
@10In
(Volt) max. (A²Sec) min.
Maximum
Power
Dissipation
(W)
SMM 20
20A
0.0025
0.09
270
SMM 25
25A
0.0019
0.08
420
1.8
2.0
SMM 30
30A
0.0013
0.07
1000
2.1
Consult manufacturer for other ratings
Electrical Characteristics
Testing Current
Blow Time
Minimum
Maximum
100%
4 hrs
N/A
200%
N/A
60 sec
Approvals
Safety Agency Approvals
Recognized File No. E20624
Amp range / I.R. ability @ Volt
20A - 30A / 100A@ 250V AC resistive
[email protected] AC resistive
300A@ 65V DC resistive
Physical Specification
Soldering Guidelines
Materials
Ceramic Body / Matte Tin Plated Brass Caps
Reflow Conditions Recommended: 240°C, 30 sec. max.
Marking
Pb-Free Process Compatibility:
When soldered to test boards using IR reflow in accordance with JEDEC
J-STD-020 (260°C, 40 sec. max.), SMM samples exhibited DCR change of
+10% to -20% from initial values.
Subsequent tests showed all samples complied with the stated electrical
characteristics on this data sheet.
On fuse:
"bel", "Current Rating" in black
'On label:
"bel", "SMM", Current Rating, Voltage Rating, Interrupting Rating,
Safety Logo and "
","
"(China RoHS compliant)
NOT Recommended for Wave solder / Direct immersion / Hand Solder
Packaging
Environmental Specification
Shock Resistance
MIL-STD-202G, Method 213B, Test Condition I (100 G's peak for 6 milliseconds).
2,000 fuses in 13 inches dia. reel, 16mm wide tape, 8mm pitch, per EIA Standard
481
Mechanical Dimensions
Vibration Resistance
MIL-STD-202G, Method 201A (10-55 Hz, 0.06 inch, total excursion).
3.1±0.1mm
2.0±0.2mm
(0.12''±0.004'')
(0.08''±0.008'')
Salt Spray Resistance
MIL-STD-202G, Method 101E, Test condition B (48 hrs).
Thermal Shock Resistance
MIL-STD-202G, Method 107G, Test Condition B (-65°C to +125°C)
3.1±0.1mm
(0.12''±0.004'')
9.8±0.2mm
(0.39''±0.008'')
Insulation Resistance:
3.8mm
MIL-STD-202G, Method 302, Test Condition A
(0.15")
(After Opening) 10,000 ohms minimum
4.1mm
Solderability:
(0.16")
MIL-STD-202G, Method 208H
Soldering Heat Resistance:
MIL-STD-202G, Method 210F
5.6mm
(0.22")
Operating Temperature
-55°C to +85°C Max.
NOTES:
– TEST CONDITIONS
For all SMM data, as well as UL Component investigation, all tests were conducted with fuse samples soldered on a PCB (1.6mm thick) test
board with copper traces measuring 0.1 mm nominal thickness (3 oz.clad), 10mm wide and 100 mm overall length.
– UL Condition of Acceptability
- the following information is contained in the UL Component Recognition for SMM Fuse Series:
The maximum temperature recorded in open air was 100 oC in a 21 oC ambient (79 oC rise). Consideration should be given to checking
operating temperatures in end-use application with regard to thermal index of surrounding materials and components.
(Maximum temperature recorded at 80% of rating (24A) for the SMM30 rating was 69 C (48 C rise).
CAUTION:
– MINIMUM FUSING POINT :
The SMM Series fuses are NOT intended to be operated at currents between 100% and 200% of ampere rating. Prolonged operation at currents
in this range may result in overheating of the fuse and/or desoldering of the fuse caps from the PCB pad.
3812 Size
RoHS6 Compliant
Type SMM
Pb
Square Ceramic Surface Mount Medium Blow Fuse
SMMC Sept.,2010
SMM - TIME CURRENT CHARACTERISTIC CURVE
20A
25A
30A
100000
10000
1000
TIME IN SECONDS
100
10
1
0.1
0.01
10
100
CURRENT IN AMPERES
1000