Texas Instruments TI-503SV

Date of introduction:  1998 Display technology:  LCD
New price:   Display size:  8
Size:  4.5" x 2.8" x 0.45"
 114 x 72 x 11 mm3
Weight:  1.7 ounces, 47 grams Serial No:  
Batteries:  LR54 Date of manufacture:  mth 10 year 1998
AC-Adapter:   Origin of manufacture:  Thailand (C)
Precision:  8 Integrated circuits:  Sharp LI3154
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

The TI-503SV followed the TI-503+ and added a square-root function. The TI-501 line of "cheap calculators" started already in the year 1982 and brought us models like the TI-502 or the TI-507.

Dismantling this early TI-503SV manufactured in October 1998 by Cal-Comp Electronics, a subsidiary of Kinpo Electronics, Inc., in Thailand reveals a Sharp LI3154 single-chip calculator circuit using a conventional package. Production of the TI-503SV was shifted in 2000 from Thailand to China.

Later models of the TI-503SV used the more common chip-on-board (COB) technology.

We know the Sharp LI-3154 calculator chip already from the cheap TI-1726.

Inspecting the PCB of this TI-503SV calculator brought our attention to a small marks reading 403T-10-3 and we started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

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If you have additions to the above article please email:

Joerg Woerner, February 25, 2021. No reprints without written permission.