Resettable PPTC Datasheet
PolySwitch® Resettable PPTCs
Battery Strap > LR4 Series
Dimensions in Millimeters (Inches)
A
A
C
C
F
B
F
B
D
E
D
E
A
B
C
D
E
F
Part
Description
Ordering Part
Number
Figure
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
19.9
22.1
4.9
5.5
0.6
1.0
5.5
7. 5
5.5
7. 5
3.9
4.1
LR4-190F
LR4-260F
LR4-380F
LR4-380XF
LR4-450F
LR4-550F
LR4-600F
LR4-600XF
LR4-730F
LR4-900F
LR4-1300SSF
RF1538-000
RF1543-000
RF1536-000
E89591-000
RF1542-000
RF1545-000
RF1549-000
A77736-000
RF1547-000
RF2165-000
RF1550-000
B1
B1
B1
B1
B1
B1
B1
B1
B1
B1
B2
(0.796) (0.884) (0.196) (0.220) (0.024) (0.040) (0.220) (0.300) (0.220) (0.300) (0.156) (0.164)
20.9 23.1 4.9 5.5 0.6 1.0 4.1 5.5 4.1 5.5 3.9 4.1
(0.836) (0.924) (0.196) (0.220) (0.024) (0.040) (0.164) (0.220) (0.164) (0.220) (0.156) (0.164)
24.0 26.0 6.9 7. 5 0.6 1.0 4.1 5.5 4.1 5.5 4.9 5.1
(0.960) (1.040) (0.276) (0.300) (0.024) (0.040) (0.164) (0.220) (0.164) (0.220) (0.196) (0.204)
32.2 35.8 4.9 5.5 0.6 1.0 5.5 7. 5 5.5 7. 5 3.9 4.1
(1.288) (1.432) (0.196) (0.220) (0.024) (0.040) (0.220) (0.300) (0.220) (0.300) (0.156) (0.164)
24.0 26 9.9 10.5 0.6 1.0 5.3 6.7 5.3 6.7 5.9 6.1
(0.960) (1.040) (0.396) (0.420) (0.024) (0.040) (0.212) (0.268) (0.212) (0.268) (0.236) (0.244)
35.0 37.0 6.9 7. 5 0.6 1.0 5.3 6.7 5.3 6.7 4.9 5.1
(1.400) (1.480) (0.276) (0.300) (0.024) (0.040) (0.212) (0.268) (0.212) (0.268) (0.196) (0.204)
24.0 26.0 13.9 14.5 0.6 1.0 4.1 5.5 4.1 5.5 5.9 6.1
(0.960) (1.040) (0.556) (0.580) (0.024) (0.040) (0.164) (0.220) (0.164) (0.220) (0.236) (0.244)
40.5 42.7 6.9 7. 5 0.6 1.0 5.2 6.8 5.2 6.8 4.9 5.1
(1.620) (1.708) (0.276) (0.300) (0.024) (0.040) (0.208) (0.272) (0.208) (0.272) (0.196) (0.204)
27.1 29.1 13.9 14.5 0.6 1.0 4.1 5.5 4.1 5.5 5.9 6.1
(1.084) (1.164) (0.556) (0.580) (0.024) (0.040) (0.164) (0.220) (0.164) (0.220) (0.236) (0.244)
45.4 47.6 7. 9 8.5 0.9 1.3 4.6 6.2 4.6 6.2 5.9 6.1
(1.816) (1.904) (0.316) (0.340) (0.036) (0.052) (0.184) (0.248) (0.184) (0.248) (0.236) (0.244)
61.5 66.5 9.4 10.0 0.9 1.3 5.0 7. 5 5.0 7. 5 5.9 6.1
(2.460) (2.660) (0.376) (0.400) (0.036) (0.052) (0.200) (0.300) (0.200) (0.300) (0.236) (0.244)
Part Naming System
Physical Characteristics &
Environmental Specifications
LR4 190 F
Physical Characteristics
0.125mm NominalThickness, Quarter-hard Nickel
Polyester
Lead Material
Tape Material
Modifier
T/N = Tin plating lead
Environmental Specifications
H
D
F
L
S
= Hole Punched in Lead
Test
Conditions
70°C, 1000 hrs
85°C/85% RH, 7 Days
Resistance Change
= Short Leaded Strap
= Lead-free Version
= Long Lead or Leads
= Slit Lead
Passive Aging
Humidity Aging
Vibration
10% typ
5% typ
MIL-STD-883D, Method 2026 No Change
Notes
Storage conditions: 40°C max., 70% RH max.; devices should remain in original sealed bags prior to use.
Devices may not meet specified values if these storage conditions are exceeded.
SS = Both Leads Slit
U
X
= Untaped
= Rotated Chip
Hold Current Indicator
Product Series
© 2022 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 08/16/22
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