Littelfuse USBR Series Manual do Utilizador descarregar pdf (Página 2)

Revised: July 12, 2010

POLYFUSE

Resettable PTCs

USBR Series

Radial Leaded > USBR Series

Speciﬁcations are subject to change without notice.

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

Temperature Rerating Curve

-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 85

10%

30%

50%

70%

90%

110 %

130%

150%

170%

Temperature (°C)

Percentage of Rated Current

06R075B

06R120B

06R155B

16R090B

16R110B

16R135B

Line/Part Number:



16R160B 



16R185B



16R250B

Average Time Current Curves

The average time current curves and Temperature Rerating curve performance is affected

by a number or variables, and these curves provided as guidance only. Customer must

verify the performance in their application.

Soldering Parameters

Pre-Heating

Zone

Refer to the condition recommended by the

ﬂux manufacturer. Max. ramping rate should

not exceed 4°C/Sec.

Soldering Zone

Max. solder temperature should not exceed

260°C

Cooling Zone Cooling by natural convection in air.

Preheating

160

190

220

260

5 max.

Temperature (°C)

Soldering Cooling

60 min.

Time(s)

Ambient Operation Temperature

-40°C -20°C 0°C 23°C 40°C 50°C 60°C 70°C 85°C

Part Number Hold Current (A)

06R075B 1.05 0.95 0.85 0.75 0.65 0.60 0.55 0.50 0.43

06R120B 1.69 1.52 1.36 1.20 1.04 0.96 0.88 0.80 0.68

06R155B 2.17 1.96 1.75 1.55 1.34 1.24 1.13 1.03 0.88

16R090B 1.31 1.17 1.04 0.90 0.75 0.69 0.61 0.55 0.47

16R110B 1.60 1.43 1.27 1.10 1.00 0.92 0.75 0.67 0.57

16R135B 1.96 1.76 1.55 1.35 1.12 1.04 0.92 0.82 0.70

16R160B 2.32 2.08 1.84 1.60 1.33 1.23 1.09 0.98 0.83

16R185B 2.68 2.41 2.13 1.85 1.54 1.42 1.26 1.13 0.96

16R250B 3.63 3.25 2.88 2.50 2.08 1.93 1.70 1.53 1.30

Temperature Rerating

100

0.1

0.001

0.01

0.75A

1.20A

1.55A

0.90A

1.10A

1.35A

1.60A

1.85A

2.50A

1 10 100 1000

Current in Amperes

Time in Seconds

USBR

1 2 3 4 5

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