The L3037 subscriber line interface circuit is a bipolar device in 70V technology developed for central office / loop carrier and private applications. The L3037 is pin to pin and function compatible with L3035/36. One particular pin (reserved in L3035/36) is now used for reverse polarity transition time programming. The line polarity transition is not affecting the AC signal transmission that can continue also during the line voltage transition.L3037 is available in two different package options: PLCC44 and PQFP44 (10 x 10mm).