73 dB PSRR at 1 kHz — noise-sensitive rail fit
The TCR2EF41,LM(CT delivers 73 dB PSRR at 1 kHz, which means it rejects ripple from a switching pre-regulator or a noisy input bus well enough to feed sensitive analog blocks — ADC reference, VCO supply, sensor bias. That 73 dB figure at 1 kHz is not typical for a 200 mA LDO in a SOT-753 package; most parts in this footprint land closer to 60 dB.
0.2 V dropout at 150 mA — headroom planning
Maximum dropout is 0.2 V at 150 mA load. For a 4.1 V fixed output, the input must stay above 4.3 V to maintain regulation under full load. That 200 mV headroom is tight — if the input rail droops below 4.3 V during a load step, the output follows. Budget an extra 100 mV margin if the board has long input traces or shared bulk capacitance. Quiescent current is 60 µA — low enough for always-on domains in battery gear, but not the ultra-low-Iq class (sub-1 µA). Expect the 60 µA to dominate standby draw if the load is micro-amps; for a 200 mA rail the Iq is negligible.
Toshiba continues to manufacture the TCR2EF series. The ROHS3 compliance is current.