Littelfuse USBR Series - Manual (Page 5)

67
Revised: July 12, 2010
POLYFUSE ® Resettable PTCs
© 2010 Littelfuse, Inc
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.
USBR S
eries
Dimension EIA Mark IEC Mark
Dimensions
Dim. (mm) Tol. (mm)
Carrier tape width W W 18 -0.5 / +1.0
Hold down tape width W
4
W
0
11 min.
Top distance between tape edges W
6
W
2
3 max.
Sprocket hole position W
5
W
1
9 -0.5 / +0.75
Sprocket hole diameter* D
0
D
0
4 -/+ 0.32
Abscissa to plane(straight lead) H H 18.5 -/+ 3.0
Abscissa to plane(kinked lead) H
0
H
0
16 -/+ 0.5
Abscissa to top H
1
H
1
32.2 max.
Overall width w/o lead protrusion C
1
42.5 max.
Overall width w/ lead protrusion C
2
43.2 max.
Lead protrusion L
1
l
1
1.0 max.
Protrusion of cut out L L 11 max.
Protrusion beyond hold-down tape l
2
l
2
Not specified
Sprocket hole pitch P
0
P
0
12.7 -/+ 0.35
Pitch tolerance
20
consecutive
-/+ 1
Device pitch 12.7
Tape thickness t t 0.9 max.
Tape thickness with splice t
1
2.0 max.
Splice sprocket hole alignment 0 -/+ 0.3
Body lateral deviation Δh Δh 0 -/+ 1.0
Body tape plane deviation Δp Δp 0 -/+ 1.3
Ordinate to adjacent component lead* P
1
P
1
3.81 -/+ 1.0
Lead spacing* F F 5.08 -/+ 0.8
*Differs from EIA specification.
Tape and Ammo Specifications
Devices taped using EIA468-B/IE286-2 standards. See table below and Figure 1 for details.
Tape and Ammo Diagram
A B
A
1
L
1
P
0
D
0
F
L
W
4
H
0
I
2
H
1
W
5
W
Reference plane
Δh Δh
H
1
H
C
1
C
2
Δh Δp
Direction of unreeling
Cross section A - B
t
Figure 1