SMM25 [BEL]
Square Ceramic Surface Mount Medium Blow Fuse; 广场陶瓷表面贴装中等熔熔断器
| 型号： | SMM25 |
| 厂家： | 
BEL FUSE INC. |
| 描述： | Square Ceramic Surface Mount Medium Blow Fuse |
| 文件： | 总2页 (文件大小：362K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
3812 Size
Type SMM
Square Ceramic Surface Mount Medium Blow Fuse
RoHS6 Compliant
Pb
SMMD Sept.,2010
Catalog Ampere Typical Cold Volt-drop
Number Rating Resistance @100% In
Melting I²t
@10In
Maximum
Power
Dissipation
(W)
(ohm)
(Volt) max. (A²Sec) min.
SMM 20
SMM 25
SMM 30
20A
25A
30A
0.0025
0.0019
0.0013
0.09
0.08
0.07
270
420
1.8
2.0
2.1
1000
Consult manufacturer for other ratings
Electrical Characteristics
Blow Time
Maximum
Testing Current
Minimum
4 hrs
100%
200%
N/A
N/A
60 sec
Approvals
Amp range / I.R. ability @ Volt
Safety Agency Approvals
20A - 30A / 100A@ 250V AC resistive
150A@125V AC resistive
300A@ 65V DC resistive
Recognized File No. E20624
Physical Specification
Materials
Ceramic Body / Matte Tin Plated Brass Caps
Soldering Guidelines
Reflow Conditions Recommended: 240°C, 30 sec. max.
Marking
On fuse:
Pb-Free Process Compatibility:
When soldered to test boards using IR reflow in accordance with JEDEC
"bel", "Current Rating" in black
J-STD-020 (260°C, 40 sec. max.), SMM samples exhibited DCR change of
+10% to -20% from initial values.
'On label:
"bel", "SMM", Current Rating, Voltage Rating, Interrupting Rating,
Safety Logo and " "," "(China RoHS compliant)
Subsequent tests showed all samples complied with the stated electrical
characteristics on this data sheet.
NOT Recommended for Wave solder / Direct immersion / Hand Solder
Packaging
Environmental Specification
2,000 fuses in 13 inches dia. reel, 16mm wide tape, 8mm pitch, per EIA Standard
481
Shock Resistance
MIL-STD-202G, Method 213B, Test Condition I (100 G's peak for 6 milliseconds).
Mechanical Dimensions
Vibration Resistance
2.0 0.2mm
3.1 0.1mm
MIL-STD-202G, Method 201A (10-55 Hz, 0.06 inch, total excursion).
(0.08'' 0.008'')
(0.12'' 0.004'')
Salt Spray Resistance
3.1 0.1mm
(0.12'' 0.004'')
MIL-STD-202G, Method 101E, Test condition B (48 hrs).
Thermal Shock Resistance
9.8 0.2mm
MIL-STD-202G, Method 107G, Test Condition B (-65°C to +125°C)
(0.39'' 0.008'')
3.8mm
(0.15")
Insulation Resistance:
MIL-STD-202G, Method 302, Test Condition A
(After Opening) 10,000 ohms minimum
Solderability:
4.1mm
(0.16")
MIL-STD-202G, Method 208H
Soldering Heat Resistance:
MIL-STD-202G, Method 210F
Operating Temperature
5.6mm
(0.22")
-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
Square Ceramic Surface Mount Medium Blow Fuse
Pb
SMMC Sept.,2010
SMM - TIME CURRENT CHARACTERISTIC CURVE
20A
25A
30A
100000
10000
1000
100
10
1
0.1
0.01
10
100
1000
CURRENT IN AMPERES
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