转到网站首页
转为中文步骤：
1、请用电脑端360浏览器打开本页地址，如您电脑未安装360浏览器，请点这里下载;
2、点击360浏览器右上角的翻译插件，如右图红圈中所示:
3、点击所弹出窗口里的右下角的按钮 “翻译当前网页”;
4、弹窗提示翻译完毕后关闭弹窗即可；
Surface Mount Fuses  
NANO2® > Slo-Blo® > 449 Series  
PS  
E
449 Series Fuse  
Description  
The lead free NANO2 Slo-Blo® fuse is RoHS compliant,  
Halogen Free and 100% lead-free. This product is fully  
compatible with lead-free solder alloys and higher  
temperature profiles associated with lead-free assembly.  
The Slo-Blo® design has enhanced inrush withstand  
characteristics over the NANO2 Fast-Acting Fuse. The unique  
time delay feature of this fuse design helps solve the  
problem of nuisance “opening” by accommodating inrush  
currents that normally cause a fast-acting fuse to open.  
Features  
tꢀ -FBEꢂGSFFꢀBOEꢀ)BMPHFOꢀ tꢀ 8JEFꢀPQFSBUJOHꢀ  
Agency Approvals  
Free  
temperature range  
tꢀ 4MPꢂ#MP®  
tꢀ -PXꢀUFNQFSBUVSFꢀ  
AGENCY  
AGENCY FILE NUMBER  
E10480  
AMPERE RANGE  
375mA - 5A  
de-rating  
tꢀ 4NBMMꢀTJ[Fꢀ  
tꢀ 8JEFꢀSBOHFꢀPGꢀDVSSFOUꢀ  
ratings available  
PS  
E
NBK030205  
1A - 5A  
Applications  
Secondary protection for space constrained applications:  
tꢀ /PUFCPPLꢀ1$  
tꢀ 5FMFDPNꢀTZTUFN  
tꢀ 8JSFMFTTꢀCBTFTUBUJPO  
tꢀ 8IJUFꢀHPPET  
Electrical Characteristics for Series  
tꢀ -$%ꢁ1%1ꢀ57ꢀ  
tꢀ -$%ꢀNPOJUPS  
% of Ampere  
OpeningTime  
4 hours, Minimum  
tꢀ -$%ꢁ1%1ꢀQBOFM  
tꢀ -$%ꢀCBDLMJHIUꢀJOWFSUFS  
tꢀ 1PSUBCMFꢀ%7%ꢀQMBZFS  
tꢀ 1PXFSꢀTVQQMZ  
tꢀ (BNFꢀDPOTPMF  
Rating  
tꢀ 0GåDFꢀ"VUPNBUJPOꢀ  
100%  
equipment  
200%  
300%  
800%  
1 sec., Min.; 60 sec., Max.  
0.2 sec., Min.; 3 sec., Max  
0.02 sec., Min.; 0.1 sec., Max.  
tꢀ #BUUFSZꢀDIBSHJOHꢀDJSDVJUꢀ  
protection  
tꢀ /FUXPSLJOHꢀ  
tꢀ *OEVTUSJBMꢀFRVJQNFOU  
tꢀ .FEJDBMꢀFRVJQNFOU  
tꢀꢀ"VUPNPUJWF  
tꢀ 1$ꢀTFSWFS  
tꢀ $PPMJOHꢀGBOꢀTZTUFN  
tꢀ 4UPSBHFꢀTZTUFN  
Electrical Specifications by Item  
Max  
Agency Approvals  
Ampere  
Rating  
(A)  
Nominal Cold  
Resistance  
(Ohms)  
Nominal  
Melting  
Voltage  
Interrupting  
Rating  
Amp Code  
PS  
E
Rating  
(V)  
I2t (A2sec)  
0.375  
0.500  
0.750  
1.00  
0.375  
0.500  
0.750  
001.  
125  
125  
125  
125  
125  
125  
125  
125  
125  
125  
125  
1.5130  
0.7633  
0.4080  
0.2516  
0.1186  
0.0708  
0.0400  
0.0352  
0.0261  
0.0227  
0.0171  
0.088  
0.258  
0.847  
1.76  
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
50 amperes @125 VAC/  
VDC  
1.50  
01.5  
4.70  
2.00  
2.50  
3.00  
3.50  
4.00  
5.00  
002.  
02.5  
003.  
03.5  
004.  
005.  
6.76  
PSE: 100 amperes  
@100 VAC  
13.18  
19.55  
32.70  
40.80  
59.59  
Notes: - l2t calculated at 8ms. Resistance is measured at 10% of rated current, 25ºC  
© 2009 Littelfuse, Inc.  
449 Series  
53  
Revised: December 17, 2010  
Specifications are subject to change without notice.  
Please refer to www.littelfuse.com/series/449.html for current information.  
Surface Mount Fuses  
®
NANO2® > Slo-Blo > 449 Series  
Temperature Rerating Curve  
AverageTime Current Curves  
1000  
100  
10  
1
Note:  
1. Derating depicted in this curve is in addition to the standard derating of 25% for  
continuous operation.  
0.1  
0.01  
0
1
10  
100  
CURRENT IN AMPERES  
Soldering Parameters  
tP  
Reflow Condition  
-Temperature Min (Ts(min)  
Pb – Free assembly  
TP  
Critical Zone  
Ramp-up  
TL to TP  
)
150°C  
TL  
Pre Heat -Temperature Max (Ts(max)  
)
200°C  
tL  
TS(max)  
-Time (Min to Max) (ts)  
60 – 120 secs  
Ramp-down  
Average ramp up rate (LiquidusTemp  
(TL) to peak  
Preheat  
3°C/second max.  
TS(min)  
tS  
TS(max) toTL - Ramp-up Rate  
3°C/second max.  
217°C  
-Temperature (TL) (Liquidus)  
Reflow  
25  
time to peak temperature  
(t 25ºC to peak)  
-Temperature (tL)  
60 – 90 seconds  
250+0/-5 °C  
Time  
PeakTemperature (TP)  
Time within 5°C of actual peak  
Temperature (tp)  
20 – 40 seconds  
Ramp-down Rate  
5°C/second max.  
8 minutes max.  
260°C  
Time 25°C to peakTemperature (TP)  
Do not exceed  
ꢃꢄꢅ¡$ꢀ1FBLꢀ  
Temperature,  
3 seconds max.  
Wave Soldering Parameters  
© 2009 Littelfuse, Inc.  
Specifications are subject to change without notice.  
Please refer to www.littelfuse.com/series/449.html for current information.  
449 Series  
54  
Surface Mount Fuses  
NANO2® > Slo-Blo® > 449 Series  
Product Characteristics  
Body: Ceramic  
Terminations:ꢀꢀ(PMEꢂQMBUFEꢀ$BQT  
.* ꢂ45%ꢂꢃꢅꢃꢇꢀ.FUIPEꢀꢆꢅ ꢇꢀ5FTUꢀ  
Condition B, 5 cycles, -65°C to  
125°C, 15 minutes @ each extreme  
.* ꢂ45%ꢂꢃꢅꢃꢇꢀ.FUIPEꢀꢃꢆꢉꢇꢀ5FTUꢀ*ꢋꢀ  
%FFOFSHJ[FEꢌꢀꢀꢆꢅꢅ(ꢍTꢀQLꢀBNQMJUVEFꢇꢀ  
sawtooth wave 6ms duration, 3  
DZDMFTꢀ9:;ꢎYZ[ꢀꢏꢀꢆꢈꢀTIPDLT  
.* ꢂ45%ꢂꢃꢅꢃꢇꢀ.FUIPEꢀꢃꢅꢆꢋꢀꢅꢌꢅꢉꢐꢀ  
BNQMJUVEFꢇꢀꢆꢅꢂꢑꢑꢀ)[ꢀJOꢀꢆꢀNJOꢌꢀꢀꢃISTꢀ  
FBDIꢀ9:;ꢏꢄIST  
Materials  
Thermal Shock  
Mechanical Shock  
Vibration  
Product Marking  
Brand, Amperage Rating  
-55°C to 125°C  
Operating  
Temperature  
Moisture  
Sensitivity Level  
-FWFMꢀꢆꢇꢀ+ꢂ45%ꢂꢅꢃꢅ$  
.* ꢂ45%ꢂꢃꢅꢃꢇꢀ.FUIPEꢀꢃꢅꢈ  
Solderability  
Moisture Resistance  
Salt Spray  
.* ꢂ45%ꢂꢃꢅꢃꢇꢀ.FUIPEꢀꢆꢅꢄꢇꢀꢆꢅꢀDZDMFT  
Insulation  
Resistance (after  
Opening)  
.* ꢂ45%ꢂꢃꢅꢃꢇꢀ.FUIPEꢀꢉꢅꢃꢇꢀ5FTUꢀ$POEJUJPOꢀ  
A (10,000 ohms minimum)  
.* ꢂ45%ꢂꢃꢅꢃꢇꢀ.FUIPEꢀꢆꢅꢆꢇꢀ5FTUꢀ  
Condition B (48hrs)  
Resistance to Soldering  
Heat  
.* ꢂ45%ꢂꢃꢅꢃꢇꢀ.FUIPEꢀꢃꢆꢅꢇꢀ5FTUꢀ  
condition B (10 sec at 260°C)  
Dimensions  
Part Numbering System  
6.86  
(.270")  
6.10  
(.240")  
0449 001. M R  
SERIES  
F
3.15  
(.124")  
T
1 A  
AMP Code*  
Refer to Electrical charac-  
teristics table  
1.45  
(.057")  
2.95  
(.116")  
1.96  
(.077")  
2.69  
(.106")  
QUANTITY Code  
.ꢀꢏꢀꢆꢅꢅꢅꢀQDT  
Recommended pad layout  
2.69  
(.106")  
PACKAGING Code  
3ꢀꢏꢀ5BQFꢀBOEꢀ3FFM  
*Example:  
0.375 Amp product is 0449.375MR  
(1 amp product shown above).  
Packaging  
Quantity &  
Packaging Option  
12mmTape and Reel  
Packaging Specification  
Quantity  
Packaging Code  
&*"ꢀ34ꢂꢒꢈꢆꢂꢃꢀꢓ*&$ꢀꢃꢈꢄꢇꢀQBSUꢀꢉꢔ  
1000  
MR  
© 2009 Littelfuse, Inc.  
449 Series  
55  
Specifications are subject to change without notice.  
Please refer to www.littelfuse.com/series/449.html for current information.  
© 2009 Littelfuse, Inc.  
56  
Specifications are subject to change without notice.