Historical Background


RCA introduced the 2N404 in 1957, and this device was one of the first of a series of highly successful germanium computer transistors developed by RCA throughout the late 1950s.  Dr. Adolph Blicher managed the RCA group responsible for the 2N404, building on his earlier work at the Radio Receptor company where he developed the RR156 computer transistor.  The 2N404 was soon adopted an as “industry standard” and sold in the millions, with multiple companies producing equivalent devices.  Related transistors include the 2N269 (electrically equivalent to the 2N404, but using a different case), the 2N404A (which is a higher current/voltage version of the 2N404) and the USAF 2N404 (qualified for military use).  The 1960 Lafayette Radio Semiconductor Directory lists the 2N404 as available from multiple companies (RCA, GE, Raytheon and Sylvania) for between $2.50 and $3.00.  The 2N404 continued to be available throughout the 1960s/70s.  The 2N404 remains in use today by hobbyists and experimenters, primarily as an audio or general purpose transistor – this modern usage is a fitting tribute to a classic germanium device, introduced over 50 years ago! 





Germanium PNP Alloy
 Junction Transistor
Type 2N404

Vintage 1950s-70s

Use: Computer


Your Transistor Museum™ 2N404 Order Will Contain:


Two Tested Transistors

(Style Shown Above)

2N404 Historic

Semiconductor Fact Sheet.

Transistor Museum™ Classic Semiconductor Storage

And Display Envelope, with  Informational Insert.

Use this Link to See the Complete  Contents of Your Order



$12 per Package (Two Transistors)

Plus Shipping/Handling


For PayPal or Check Payment

Copyright © 2005, 2009 by Jack Ward.  All Rights Reserved.