LT3042EMSE#TRPBF

LT3042EMSE#TRPBF is an Analog Devices 20 V, 200 mA ultralow-noise LDO regulator in a 12-lead MSOP package, tape and reel - for noise-sensitive RF rails: PLLs, VCOs, mixers and LNAs where supply noise limits phase noise. The 0.8 uVRMS output noise (10 Hz to 100 kHz) with 79 dB PSRR at 1 MHz is the selection point: switcher ripple is rejected at frequencies where ordinary LDOs give up, so this part works as a post-regulator that cleans a noisy DC-DC rail without an LC filter. The current-reference architecture keeps noise, PSRR and bandwidth virtually constant from 0 V to 15 V output, programmed by one resistor, and multiple devices parallel directly to cut noise further and spread heat across the board. ADI lists the LT3042 as RECOMMENDED FOR NEW DESIGNS. Selection advice: the EMSE code is the 12-lead MSOP; the TRPBF suffix is tape and reel. Against the 500 mA LT3045 on this site - same ultralow-noise architecture, so choose the LT3042 for rails under 200 mA and save dissipation; match the package code to your footprint, since the DFN and MSOP variants differ. The negative-rail complement is the LT3094, and the part is AEC-Q100 qualified for automotive use.