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.

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MIL�PRF�19500/581C

3.3 Abbreviations, symbols, and definitions. Abbreviations, symbols, and definitions used herein shall be as

RθJA

Thermal resistance junction to ambient.

RθJC

Thermal resistance junction to case.

3.4 Interface and physical dimensions. The interface requirements and physical dimensions shall be as specified

in MIL�PRF�19500 and on figure 1 (TO�205AD, formerly TO-39) herein.

3.4.1 Lead finish. Unless otherwise specified, lead finish shall be solderable in accordance with MIL�STD�750,

MIL�PRF�19500, and herein. Where a choice of lead finish is desired, it shall be specified in the acquisition

document (see 6.2).

3.4.2 Polarity. The identification of terminals of the device package shall be as shown on figure 1. Terminal 1

shall be connected to the emitter, terminal 2 shall be connected to the base, and terminal 3 shall be connected to the

collector. The collector shall be electrically connected to the case.

3.5 Electrical performance characteristics. Unless otherwise specified herein, the electrical performance

characteristics are as specified in 1.3, 1.4, and table I.

3.6 Electrical test requirements. The electrical test requirements shall be as specified in table I herein.

3.7 Marking. Marking shall be in accordance with MIL�PRF�19500.

3.8 Workmanship. Semiconductor devices shall be processed in such a manner as to be uniform in quality and

shall be free from other defects that will affect life, serviceability, or appearance.

4. VERIFICATION

4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:

Qualification inspection (see 4.2).

Screening (see 4.3).

Conformance inspection (see 4.4 and tables I and II).

4.2 Qualification inspection. Qualification inspection shall be in accordance with MIL�PRF�19500 and as specified

herein.

4.2.1 Group E qualification. Group E inspection shall be performed for qualification or re-qualification only. In

case qualification was awarded to a prior revision of the specification sheet that did not request the performance of

table II tests, the tests specified in table II herein that were not performed in the prior revision shall be performed on

the first inspection lot of this revision to maintain qualification.