Type SMM
SMM Feb 2012D
3812 Size
RoHS 6 Compliant
Square Ceramic Surface Mount Medium Blow Fuse
SMM Series Fuse
Features
- Medium Blow
- Suface mount high current fuse
- Current rating from 20A to 30A
- Wide operating temperature range from -55
o
C to 125
o
C
- Tape and Reel for auto-insert SMD process
- Compatible with reflow process
- Halogen Free
- Leadfree Pb
Pb
Applications
Electrical Characteristics (UL / CSA /STD.248-14)
- Voltage regulator module
- PC server
- Office electronic equipment
- Industrial equipment
- Medical equipment
- POE, POE+
- Power supply
- DC-DC Converter
HALOGEN FREE =
LEAD FREE =
HF
Pb
Safety Agent Approvals
SAFETY
AGENCY
SAFETY
AGENCY
CERTIFICATE
AMPERE RANGE / VOLT
@ I.R.ABILITY
E20624
20A - 30A / 250V @100A AC
125V @ 150A AC
72V @ 130A DC
65V @ 300A DC
20A - 30A
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
‧Tel:
201-432-0463
‧Fax:
201-432-9542
‧E-Mail:
belfuse.com
Website: www.belfuse.com
Type SMM
Electrical Specifications
Nominal
Nominal
Cold
Volt-drop
Resistance @100% In
(ohm)
(volt)
3812 Size
RoHS 6 Compliant
Square Ceramic Surface Mount Medium Blow Fuse
Pb
SMM Feb 2012C
Catalog
Number
Ampere
Rating
(A)
Interrupting Rating
Max.
Voltage
Rating
(V)
Melting I2T
@ 10 In
(A2 Sec)
Min.
Nominal
Power
Dissipation
(W)
Agency Approvals
SMM 20
SMM 25
SMM 30
20A
25A
30A
0.0025
0.0019
0.0013
0.09
0.08
0.07
20A - 30A / 250V @100A AC
125V @ 150A AC
72V @ 130A DC
65V @ 300A DC
250
250
250
270
420
1000
1.8
2.0
2.1
Y
Y
Y
Y
Y
Y
Soldering Guidelines
Reflow Conditions Recommended: 240° 30 sec. max.
C,
Pb-Free Process Compatibility:
When soldered to test boards using IR reflow in accordance with JEDEC J-STD-020 (260° 40 sec. max.), SMM samples exhibited DCR change
C,
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
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
o
C in a 21
o
C ambient (79
o
C 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
o
C (48
o
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.
Average Time Current Curve
Temperature Derating Curve
140
130
120
Percent of Rated Current
SMM - TIME CURRENT CHARACTERISTIC CURVE
20A
25A
30A
110
100
90
80
70
60
50
541 31 21 11 01 59 58 57 56 55 54 53 52 51 5
5 5 5 5
5- 51-52-53-54-55-56-57-
100000
10000
Ambient Temperature [
o
C]
1000
TIME IN SECONDS
100
10
1
0.1
0.01
10
100
1000
CURRENT IN AMPERES
CORPORATE OFFICE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
E-Mail: belfuse@belfuse.com
Website: www. belfuse.com
FAR EAST OFFICE
Bel Fuse Ltd.
EUROPE OFFICE
Bel Fuse Europe Ltd.
EUROPE
Bel Stewart GmbH
Industriestrasse 20
61381 Friedrichsdorf
Germany
Tel 49-6172-9552-0
Fax 49-6172-9552-40
8/F Luk Hop Industrial Building Preston Technology Management Centre
8 Luk Hop Street
Marsh Lane, Suite F15
San Po Kong
Preston, Lancashire, PR1 8UQ
Kowloon, Hong Kong
United Kingdom
Tel 852-2328-5515
Tel 44-1772-556601
Fax 852-2352-3706
Fax 44-1772-888366
SSQDNOV201
Type SMM
Physical Specifications
3812 Size
RoHS 6 Compliant
Pb
SMM Feb 2012C
Square Ceramic Surface Mount Medium Blow Fuse
Pb
Environmental Specifications
Mechanical Dimensions
±
3.1 0.1mm
(0.12'' 0.004''
)
3.1 0.1mm
(0.12'' 0.004''
)
2.0 0.2mm
(0.08'' 0.008''
Ordering Information
9.8 0.2mm
(0.39'' 0.008'')
3.8mm
(0.15")
5.6m
m(0.2
2")
Packaging
CORPORATE OFFICE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
E-Mail: belfuse@belfuse.com
Website: www. belfuse.com
FAR EAST OFFICE
Bel Fuse Ltd.
8/F Luk Hop Industrial Building
8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel 852-2328-5515
Fax 852-2352-3706
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
4.1mm
(0.16")
EUROPE OFFICE
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite F15
Preston, Lancashire, PR1 8UQ
United Kingdom
Tel 44-1772-556601
Fax 44-1772-888366
EUROPE
Bel Stewart GmbH
Industriestrasse 20
61381 Friedrichsdorf
Germany
Tel 49-6172-9552-0
Fax 49-6172-9552-40
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