TECHNICAL DATA SHEET
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Website: http://www.microsemi.com
T4-LDS-0010 Rev. 3 (101342) Page 3 of 4
PACKAGE DIMENSIONS
NOTES:
1. Dimension are in inches.
2. Millimeters are given for general information only.
3.
Beyond r (radius) maximum, TH shall be held for a minimum length of .011 inch (0.28 mm).
4.
Dimension TL measured from maximum HD.
5.
Body contour optional within zone defined by HD, CD, and Q.
6.
Leads at gauge plane .054 +.001 -.000 inch (1.37 +0.025 -0.00 mm) below seating plane shall be within .007 inch
(0.18mm) radius of true position (TP) at maximum material condition (MMC) relative to tab at MMC.
7.
Dimension LU applies between L1 and L2. Dimension LD applies between L2 and LL minimum. Diameter is
uncontrolled in L1 and beyond LL minimum.
8.
All four leads.
9.
Dimension r (radius) applies to both inside corners of tab.
10.
In accordance with ASME Y14.5M, diameters are equivalent to φx symbology.
11.
Lead 1 = emitter, lead 2 = base, lead 3 = collector, lead 4 = case (electrically connected).
FIGURE 1. Physical dimensions for 2N918 (TO-72).
Symbol
Dimensions
Inches Millimeters Note
Min Max Min Max
CD .178 .195 4.52 4.95 5
CH .170 .210 4.32 5.33
HD .209 .230 5.31 5.84 5
LC .100 TP 2.54 TP 7,8
LD .016 .021 .406 .533 7,8
LL .500 .750 12.70 19.05 7,8
LU .016 .019 .406 .483
L1 .050 1 .27
L2 .250 6.35
P .100 2.54
Q .040 1.02 5
TL .028 .048 .71 1.22
TW .036 .046 .91 1.17
r .007 .18
α 45° TP