Epson also has programmable oscillators with the SG-8002 and newer SG-8003 series. Programmable oscillators have less than three weeks lead-time or less depending on the availability of blanks and are all pin compatible to its fixed-frequency equivalent. Designers who need parts quickly for a proto-build may use a programmable until the fixed-frequency equivalent arrives or may continue to use the programmable for mass production. Many customers approve a programmable part as a second source to smooth out demand fluctuation with the fixed-frequency version. The SG-8002 series is an ideal choice for a larger package size, 7.0 x 5.0mm and 3.3 or 5V operation. Otherwise, the newer SG-8003 series is a better choice with a smaller package size, an extended frequency range, a lower supply voltage option, lower current and an additional frequency tolerance option, as highlighted in blue shown here.