CJT1117B-3.3

CJT1117B-3.3 is the SOT-223 ordering code for the CJ (Jiangsu Changjing) CJT1117B low-dropout regulator, fixed 3.3 V variant, listed word-for-word in the ordering information of the maker’s CJT1117B datasheet (Rev. 2.3). One documentation note belongs on the record: Changjing publishes two parallel series manuals - this CJT1117B document (Rev. 2.3) and an SCJT1117B series document (Rev. 2.0) whose codes carry an S prefix and whose electrical specifications differ (0.03 % typical line regulation, a 1.3 V typical dropout). Every figure on this page follows the no-S Rev. 2.3 manual for this exact code; the S-series values must not be carried onto a CJT1117B lot. The regulator delivers up to 1 A, holds its output between 3.251 V and 3.350 V at a 10 mA load and between 3.234 V and 3.366 V across the full 10 mA to 1 A and 4.8 V to 12 V range, shows a dropout voltage of 1.15 V typical and 1.30 V maximum at 1 A, line regulation of 7 mV maximum, load regulation of 13.2 mV maximum, and ripple rejection of 60 dB minimum and 75 dB typical at 120 Hz (22 µF tantalum output capacitor, 3 V input-output differential, 1 A load), over a -40 °C to +125 °C junction range. The selection point is a 1 A-class 1117-format rail in SOT-223: legacy 1117 sockets and new cost-sensitive designs get the familiar footprint with Changjing-documented figures. Selection advice: Changjing publishes no lifecycle grading for the family, so qualify against the current datasheet revision, and plan the input headroom around the 1.15 V typical dropout rather than a modern CMOS-LDO figure. Parameters verified against the Changjing CJT1117B datasheet Rev. 2.3 (ordering information and electrical characteristics).