Littelfuse 250R Series Uživatelský manuál stáhnout pdf (Strana 4)

100

Revised: August 31, 2011

POLY-FUSE

Resettable PTCs

250R Series

Radial Leaded > 250R Series

Speciﬁcations are subject to change without notice.

Please refer to www.littelfuse.com/series/250R.html for current information.

Environmental Speciﬁcations

Operating/Storage

Temperature

¡$UP¡$

Maximum Device Surface

Temperature in Tripped State

¡$

Passive Aging ¡$¡$IPVST

Humidity Aging ¡$3)IPVST

Thermal Shock

.*-o45%o'.FUIPE(

¡$UP¡$UJNFT

Solvent Resistance .*-o45%o.FUIPE'

Moisture Sesitivity Level -FWFM+o45%o$

Physical Speciﬁcations

Lead Material Tin-plated Copper

Soldering

Characteristics

4PMEFSBCJMJUZQFS.*-o45%o

Method 208E

Insulating Material

$VSFEnBNFSFUBSEBOUFQPYZQPMZNFS

NFFUT6-7SFRVJSFNFOUT

Device Labeling

.BSLFEXJUIh-'hWPMUBHFDVSSFOUSBUJOH

and date code.

Soldering Parameters - Wave Soldering

Condition 8BWF4PMEFSJOH

Peak Temp/ Duration Time ¡$

5 Sec

220°C 2 Sec ~ 20 Sec

Preheat 140°C ~ 180°C 180 Sec ~ 210 Sec

Storage Condition ¡$_¡$

3)

t3FDPNNFOEFETPMEFSJOHNFUIPETIFBUFMFNFOUPWFOPS

environment for lead-free.

t%FWJDFTBSFEFTJHOFEUPCFXBWFTPMEFSFEUPUIFCPUUPN

side of the board.

t%FWJDFTDBOCFDMFBOFEVTJOHTUBOEBSEJOEVTUSZNFUIPET

and solvents.

t5IJTQSPmMFDBOCFVTFEGPSMFBEGSFFEFWJDF

Note:*GTPMEFSJOHUFNQFSBUVSFTFYDFFEUIFSFDPNNFOEFE

proﬁle, devices may not meet the performance

requirements.

Preheating

160

190

220

260

2 to 5

Temperature ( °C)

Soldering Cooling

20-30

180 to 210

Time(s)

1 2 3 4 5 6 7

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