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Texas Instruments LP3874EMP-3.3 — Power Management (PMIC / Gate Driver)

LP3874EMP-3.3 LDO, 800 mA, 3.3 V fixed, SOT-223-5

MPNLP3874EMP-3.3
End of Life

Texas Instruments LP3874EMP-3.3 LDO voltage regulator, 800 mA output, 3.3 V fixed, SOT-223-5 surface-mount package, 0.35 V dropout at 800 mA, PSRR 73 dB at 120 Hz.

$2.42Ref. price · indicative, final on quote
Texas Instruments LP3874EMP-3.3 datasheet (PDF)
PackagingTO-261-5, TO-261AB
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LP3874EMP-3.3 specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input7V
Voltage dropout0.35V @ 800mA
Voltage - output (Min (Fixed))3.3V
Output current800mA
Current - supply15 mA
Current - quiescent9 mA
Operating temperature-40°C ~ 125°C
PSRR73dB ~ 57dB (120Hz)
PackageBulk
CaseTO-261-5, TO-261AB
Control featuresEnable
Protection featuresOver Current, Over Temperature, Short Circuit
Number of regulators1
Output configurationPositive

Product details

Dropout and PSRR — the two numbers that decide the rail quality

The LP3874EMP-3.3 is a fixed 3.3 V output LDO rated for 800 mA continuous. PSRR is specified at 73 dB at 120 Hz, dropping to 57 dB at the same frequency — typical for a 120 Hz ripple rejection figure that holds well into the kHz range. For a 5 V rail feeding a 3.3 V analog supply, this attenuates 100 mV of 120 Hz ripple down to roughly 20 µV at the output, clean enough for a 16-bit ADC reference.

Thermal and protection envelope

Built-in over-current, over-temperature, and short-circuit protection means the regulator survives a momentary output short without latching off or exceeding the absolute-maximum junction temperature — the thermal shutdown cycle restarts when the die cools.

Frequently asked questions

What is the PSRR of the LP3874EMP-3.3?

PSRR is 73 dB at 120 Hz, dropping to 57 dB at the same frequency — typical for a 120 Hz ripple rejection figure that holds well into the kHz range.

Will LP3874EMP-3.3 drop into a board designed for LP38858T-1.2/NOPB?

No — the LP38858T-1.2/NOPB is a through-hole part (TO-220 package) with a 1.2 V fixed output, while the LP3874EMP-3.3 is a surface-mount SOT-223-5 with a 3.3 V fixed output. They are not pin-compatible or voltage-compatible without a board spin.