200 mA LDO with 300 nA Iq — the always-on rail choice
The Texas Instruments TPS7A0315PDBVR is a single-output, positive-voltage linear regulator delivering a fixed 1.5V output at up to 200 mA. Its quiescent current is 300 nA. The 55 dB PSRR at 1 kHz provides ripple rejection. The SOT-23-5 package keeps the footprint small.
What the key ratings mean for your BOM
300 nA quiescent current (Iq) is the headline number. In a battery-powered design that spends most of its time in sleep mode, this Iq directly sets the floor for standby power draw. The 200 mA output is sized for low-power MCUs, RF transceivers, and auxiliary sensor rails. Dropout voltage maxes at 0.56 V at full load. The 55 dB PSRR at 1 kHz is respectable for an ultra-low Iq part. The enable pin allows the system to shut down the regulator entirely.
Lifecycle and compliance — active, no LTB watch needed
This is a part you can specify for new designs without planning for a last-time-buy window. It is ROHS3 Compliant, which covers the EU RoHS directive with no exempted substances. For buyers needing compliance documentation beyond RoHS — REACH, UL, IEC — those certificates are manufacturer-issued and typically available through the TI website or upon request from the distributor. The SOT-23-5 package is a standard, widely second-sourced footprint, so board layout risk is minimal.
Protection features reduce external guard circuitry
Built-in over-current, over-temperature, and under-voltage lockout (UVLO) protections are integrated on-die. Over-current limits the output during a fault or short; thermal shutdown prevents die damage under excessive load or ambient temperature; UVLO holds the output off until the input rail is high enough for clean startup. These features eliminate the need for an external supervisor or current-limiting resistor on the output, saving board space and BOM cost in cost-sensitive or compact designs.