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MIL-PRF-19500-581 Semiconductor Device, Transistor, Npn, Silicon Amplifier, Types 2N4237, 2N4238, And 2N4239, Jan, Jantx, And JantxvThis specification covers the performance requirements for NPN, silicon, amplifier transistors. Three levels of product assurance are provided for each device type as specified in MIL-PRF-19500.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14

MIL�PRF�19500/581C

Dimensions

Ltr

Inches

Millimeters

Notes

Min

Max

Min

Max

.305

.355

7.75

9.02

.240

.260

6.10

6.60

.335

.370

8.51

9.40

.200 TP

5.08TP

.016

.021

0.41

0.53

.500

.750

12.70

19.05

.016

.019

0.41

0.48

.050

1.27

.250

6.35

.029

.045

0.74

1.14

.028

.034

0.71

0.86

.100

2.54

.050

1.27

.010

0.25

45� TP

Notes

1, 2, 8, 9

NOTES:

1. Dimensions are in inches. Millimeters are given for general information only.

2. Lead designation shall be as follows: Terminal 1 is the emitter, terminal 2 is the base, and terminal 3 is the

collector. Lead number three is electrically connected to case.

3. 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 true position (TP) relative to tab. Device may be measured by

direct methods or by gauge.

4. Dimension LD applies between L1 and L2. Dimension LD applies between dimension L2 and LL minimum.

5. Dimension TL is measured from dimension HD maximum.

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

7. Dimension CD shall not vary more than .010 inch (0.25 mm) in zone P. This zone is controlled for

automatic handling.

8. Details of outline in this zone are optional.

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

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

FIGURE 1. Physical dimensions (TO�205AD formerly TO�39).