SMM 20

Manufacturer Part NumberSMM 20
DescriptionFUSE 20A M-BLOW 250V 3812 SMD
ManufacturerBel Fuse Inc
SeriesSMM
SMM 20 datasheet
 

Specifications of SMM 20

Fuse TypeNormal BlowVoltage - Rated250VAC
Current20APackage / CaseNon-Standard SMD
Size / Dimension0.386" L x 0.122" W x 0.122" H (9.80mm x 3.10mm x 3.10mm)Mounting TypeSurface Mount
Operating Temperature-55°C ~ 85°CDc Cold Resistance0.003 Ohm
Melting I²t270Lead Free Status / RoHS StatusLead free / RoHS Compliant
Color-Other names507-1522-2
SMM20
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Type SMM
Square Ceramic Surface Mount Medium Blow Fuse
SMMD Sept.,2010
Electrical Characteristics
Blow Time
Testing Current
Minimum
100%
4 hrs
200%
N/A
Approvals
Amp range / I.R. ability @ Volt
Safety Agency Approvals
20A - 30A / 100A@ 250V AC resistive
Recognized File No. E20624
150A@125V AC resistive
300A@ 65V DC resistive
Soldering Guidelines
Reflow Conditions Recommended: 240° C, 30 sec. max.
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.
NOT Recommended for Wave solder / Direct immersion / Hand Solder
Environmental Specification
Shock Resistance
MIL-STD-202G, Method 213B, Test Condition I (100 G's peak for 6 milliseconds).
Vibration Resistance
MIL-STD-202G, Method 201A (10-55 Hz, 0.06 inch, total excursion).
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)
Insulation Resistance:
MIL-STD-202G, Method 302, Test Condition A
(After Opening) 10,000 ohms minimum
Solderability:
MIL-STD-202G, Method 208H
Soldering Heat Resistance:
MIL-STD-202G, Method 210F
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
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.
Catalog
Ampere
Typical Cold
Number
Rating
Resistance
(ohm)
SMM 20
20A
0.0025
SMM 25
25A
0.0019
SMM 30
30A
0.0013
Consult manufacturer for other ratings
Maximum
N/A
60 sec
Physical Specification
Materials
Ceramic Body / Matte Tin Plated Brass Caps
Marking
On fuse:
"bel", "Current Rating" in black
'On label:
"bel", "SMM", Current Rating, Voltage Rating, Interrupting Rating,
Safety Logo and "
Packaging
2,000 fuses in 13 inches dia. reel, 16mm wide tape, 8mm pitch, per EIA Standard
481
Mechanical Dimensions
3.1±0.1mm
(0.12''±0.004'')
3.1±0.1mm
(0.12''±0.004'')
3.8mm
(0.15")
o
o
o
C in a 21
C ambient (79
C rise). Consideration should be given to checking
3812 Size
RoHS6 Compliant
Pb
Volt-drop
Melting I²t
Maximum
@100% In
@10In
Power
Dissipation
(Volt) max. (A²Sec) min.
(W)
0.09
270
1.8
0.08
420
2.0
0.07
1000
2.1
","
"(China RoHS compliant)
2.0±0.2mm
(0.08''±0.008'')
9.8±0.2mm
(0.39''±0.008'')
4.1mm
(0.16")
5.6mm
(0.22")

SMM 20 Summary of contents

  • Page 1

    ... 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. Catalog Ampere Typical Cold Number Rating Resistance (ohm) SMM 20 20A 0.0025 SMM 25 25A 0.0019 SMM 30 30A 0.0013 ...

  • Page 2

    Type SMM Square Ceramic Surface Mount Medium Blow Fuse 100000 10000 1000 100 10 1 0.1 0.01 10 SMM - TIME CURRENT CHARACTERISTIC CURVE 20A 25A 30A 100 CURRENT IN AMPERES 3812 Size RoHS6 Compliant Pb SMMC Sept.,2010 1000 ...