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Texas Instruments LM1117IMP-ADJ/NOPB — Analog & Data Acquisition

LM1117IMP-ADJ/NOPB Adjustable LDO, 800mA, SOT-223-4, Active

MPNLM1117IMP-ADJ/NOPB
Active

Texas Instruments LM1117IMP-ADJ/NOPB, adjustable positive LDO regulator, 800 mA output, 1.2 V max dropout, 75 dB PSRR at 120 Hz, -40°C to 125°C, SOT-223-4 package.

$1.7000Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM1117IMP-ADJ/NOPB specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Voltage - input15V
Voltage dropout1.2V @ 800mA
Voltage - output13.8V
Voltage - output (Min (Fixed))1.25V
Output current800mA
Current - supply10 mA
Current - quiescent5 mA
Operating temperature-40°C~125°C
PSRR75dB (120Hz)
PackageTape & Reel (TR); Cut Tape (CT)
CaseTO-261-4, TO-261AA
Protection featuresOver Current, Over Temperature
Number of regulators1
Output configurationPositive

Product details

Dropout headroom at 800 mA

The LM1117IMP-ADJ/NOPB is a single-output adjustable LDO from TI's LM1117 family, rated for 800 mA continuous output. The maximum dropout voltage is 1.2 V at that full load — meaning the input must stay at least 1.2 V above the programmed output to maintain regulation. For a 3.3 V output rail, the input needs at least 4.5 V, which is comfortable off a 5 V bus but tight from a 3.6 V lithium cell.

Ripple rejection and output range

PSRR is 75 dB at 120 Hz, which knocks down mains ripple by a factor of about 5600 — useful when this LDO follows a full-wave rectifier or a noisy switching pre-regulator. The adjustable output spans from a 1.25 V reference up to 13.8 V, limited by the 15 V maximum input. Quiescent current runs 5 mA typical, with a 10 mA supply-current ceiling.

Industrial temperature grade and protection

On-chip protection includes over-current limiting and thermal shutdown — no external watchdog needed for basic fault survival.

Frequently asked questions

Does LM1117IMP-ADJ/NOPB require external capacitors?

Like all LDO regulators, it needs input and output capacitors for stability — the datasheet specifies minimum capacitance values and ESR ranges. The exact recommendation depends on the output voltage and load transient requirements.

Can LM1117IMP-ADJ/NOPB replace LM1117T-ADJ?

Both are adjustable LDOs from the same LM1117 family with the same 800 mA rating and dropout spec. The key difference is the package: LM1117IMP-ADJ/NOPB is in SOT-223-4 (surface-mount), while LM1117T-ADJ is in TO-220 (through-hole). They are not pin-compatible — the board layout must match the package.