Historical Background


The transistor was invented at Bell Labs in late 1947.  This first transistor technology was known as “point contact”, a term which referred to the construction process of two pointed wires or contacts that were physically pressed down onto a germanium block. Point contact technology was quickly superceded by more stable and manufacturable transistor types, such as grown junction and alloy junction.  By the mid 1950s, point contact units were obsolete.  Western Electric continued to manufacture a few point contact types (such as the 2N110) into the 1960s.


The 2N110 was introduced by Western Electric in 1955, and was listed as a point contact transistor triode in a hermetically sealed enclosure.  The 2N110 was initially identified as the Model 2031 Developmental device.  It was designed for use over a wide temperature range in switching circuits where large-signal parameters of the active device are of primary interest.   Electrically, it is similar to the 2N21 Western Electric device.


The 2N110 was used by Western Electric in phone company equipment and also by the U.S. Military.  It was manufactured and sold well into the 1960s.






Point Contact Transistor

Vintage 1950s – 1960s

Use: Military/Phone Company


Your Transistor Museum™ 2N110 Order Will Contain:


One Tested Transistor.

(Style Shown Above)

2N110 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



$20 per Package (One Transistor)

Add $2.50 Shipping/Handling within U.S.


For PayPal or Check Payment

Copyright © 2007 by Jack Ward.  All Rights Reserved.