TECHNICAL DATA SHEET

6 Lake Street, Lawrence, MA 01841

Gort Road Business Park, Ennis, Co. Clare, Ireland

1-800-446-1158 / (978) 620-2600 / Fax: (978) 689-0803

Tel: +353 (0) 65 6840044 Fax: +353 (0) 65 6822298

Website: http://www.microsemi.com

T4-LDS-0057 Rev. 3 (110213)

Page 4 of 8

NOTES:

1. Dimensions are in inches.

2. Millimeters are given for general information only.

3. Symbol TL is measured from HD maximum.

4. Details of outline in this zone are optional.

5. Leads at gauge plane .054 inch (1.37 mm) +.001 inch (0.03 mm) -.000 inch (0.00 mm) below seating plane shall be

within .007 inch (0.18 mm) radius of TP relative to tab. Device may be measured by direct methods or by gauge.

6. Symbol LU applies between L1 and L2. Dimension LD applies between L2 and LL minimum.

7. Lead number three is electrically connected to case.

8. Beyond r maximum, TW shall be held for a minimum length of .011 inch (0.28 mm).

9. Symbol r applied to both inside corners of tab.

10. In accordance with ASME Y14.5M, diameters are equivalent to φx symbology.

11. Lead 1 is emitter, lead 2 is base, and lead 3 is collector.

FIGURE 2. Physical dimensions - TO-46 (2N4449).

Dimensions

Ltr

Inches

Millimeters

Notes

Min

Max

Min

Max

CD

.178

.195

4.52

4.95

CH

.065

.085

1.65

2.16

HD

.209

.230

5.31

5.84

LC

.100 TP

2.54 TP

5

LD

.016

.021

0.41

0.53

LL

.500

1.750

12.70

44.45

6

LU

.016

.019

0.41

0.48

6

.050

1.27

6

.250

6.35

6

Q

.040

1.02

3

TL

.028

.048

0.71

1.22

8

TW

.036

.046

0.91

1.17

4

r

.010

0.25

9

α

45° TP

45° TP