MIL-PRF-19500/348F
Dimensions
Symbol
Inches
Millimeters
Notes
TO-39
Min
Max
Min
Max
CD
.305
.335
7.75
8.51
TO-5
CH
.240
.260
6.10
6.60
HD
.335
.370
8.51
9.40
LC
.200 TP
5.08 TP
6
LD
.016
.021
0.41
0.53
7, 8
LL
7, 8, 11, 12
LU
.016
.019
.041
0.48
7, 8
L1
.050
1.27
7, 8
L2
.250
6.35
7, 8
Q
.050
1.27
5
TL
.029
.045
0.74
1.14
4
TW
.028
.034
0.71
0.86
3
r
.010
0.25
10
α
45° TP
45° TP
6
P
.100
2.54
NOTES:
1. Dimension are in inches.
2. Millimeters are given for general information only.
3. Beyond r (radius) maximum, TW shall be held for a minimum length of .011 (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 +0.03 -0.00 mm) below seating plane shall be within .007
inch (0.18 mm) radius of true position (TP) at maximum material condition (MMC) relative to tab at MMC. The
device may be measured by direct methods.
7. Dimension LU applies between L1 and L2. Dimension LD applies between L2 and minimum. Diameter is
uncontrolled in L1 and beyond LL minimum.
8. All three leads.
9. The collector shall be internally connected to the case.
10. Dimension r (radius) applies to both inside corners of tab.
11. For "non-L"-suffix devices (TO-39), dimension LL is .500 (12.70 mm) minimum, .750 (19.05 mm) maximum.
12. For "L" suffix devices (TO-5), dimension LL is 1.500 (38.10 mm) minimum, 1.750 (44.45 mm) maximum.
13. Lead 1 = emitter, lead 2 = base, lead 3 = collector.
14. In accordance with ASME Y14.5M, diameters are equivalent to Φx symbology.
* FIGURE 1. Physical dimensions (TO-39, TO-5).
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