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Rare Texas Instruments Type 951 Grown-Junction Silicon Transistor Historic NOS, US $221 – Picture 0
Rare Texas Instruments Type 951 Grown-Junction Silicon Transistor Historic NOS, US $221 – Picture 0

Rare Texas Instruments Type 951 Grown-junction Silicon Transistor Historic Nos

US $221

  • Van Nuys, California, United States
  • Jun 24th
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               Texas Instruments Type 951               Grown Junction Transistor   Rare and historic, this is one of the first silicon transistors available.  TI type 951, first offered for sale in 1954 at $100.00 (equivalent to $800 today).   Texas Instruments was the first company to offer production silicon transistors, “beating out the competition by several years…”   Only germanium transistors were available before these were produced.  The main advantages of silicon transistors were lower leakage and wider operating temperature range.   This transistor was produced in the mid to late 50’s (more than 55 years old).  The 900 series transistors were no longer made after the early 60’s, as many new types replaced them.   This is an original type 951 working transistor with an HFE (gain) of  approximately 25. The original heat sink is included.  The Type 951 is known  as “the first TI medium power silicon transistor”.  Individually bagged for  protection, with full gold plated leads.  Many vintage transistors had gold  plated leads but competition eventually forced manufacturers to drop gold  plating due to high cost.  Gold plating improved reliability, socketability,  resisted corrosion, and looked great!   Link to “Texas Instruments Photo Gallery”: https://sites.google.com/site/transistorhistory/Home/us-semiconductor-manufacturers/ti/ti-photo-gallery    Link to “Early Semiconductor History of Texas Instruments”: https://sites.google.com/site/transistorhistory/Home/us-semiconductor-manufacturers/ti   Link to “Transistor Museum”: http://semiconductormuseum.com/PhotoGallery/PhotoGallery_TI_900_Series.htm    

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