Littelfuse 250R Series - Manual (Page 2)

98
Revised: August 31, 2011
POLY-FUSE ® Resettable PTCs
© 2011 Littelfuse, Inc.
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.
Ambient Operation Temperature
¡$ ¡$ ¡$ ¡$ ¡$ ¡$ ¡$ ¡$ ¡$
Part Number Hold Current (A)
250R080 0.12 0.11 0.09 0.08 0.06 0.05 0.05 0.04 0.03
250R080T 0.12 0.11 0.09 0.08 0.06 0.05 0.05 0.04 0.03
250R120 0.18 0.16 0.14 0.12 0.10 0.09 0.08 0.06 0.05
250R120T 0.18 0.16 0.14 0.12 0.10 0.09 0.08 0.06 0.05
250R145 0.26 0.20 0.17 0.145 0.12 0.11 0.09 0.08 0.06
250R145T 0.26 0.20 0.17 0.145 0.12 0.11 0.09 0.08 0.06
250R180 0.28 0.23 0.21 0.18 0.16 0.13 0.10 0.11 0.083
250R180T 0.28 0.23 0.21 0.18 0.16 0.13 0.10 0.11 0.083
Temperature Rerating
Temperature Rerating Curve
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
10%
30%
50%
70%
90%
110%
130%
150%
170%
Temperature (°C)
Percentage of Rated Current
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.
0.01
0.1
1
10
100
1000
10000
100000
0.080A 0.120A 0.145A 0.180A
250R
0.1 1 10 100
Current in Amperes
Time in Seconds