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STMicroelectronics LD1117DT12CTR — Power Management (PMIC / Gate Driver)

LD1117DT12CTR STMicroelectronics 1.2V Fixed LDO, 800mA, DPAK

MPNLD1117DT12CTR
Active

STMicroelectronics LD1117DT12CTR, a fixed-output 1.2V LDO in DPAK (TO-252), 800mA output, 1.3V dropout max, 75dB PSRR at 120Hz, -40°C to 125°C industrial temperature range.

$0.8100Ref. price · indicative, final on quote
STMicroelectronics LD1117DT12CTR datasheet (PDF)
PackagingTO-252-3, DPak (2 Leads + Tab), SC-63
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LD1117DT12CTR specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input15V
Voltage dropout1.3V @ 800mA
Voltage - output (Min (Fixed))1.2V
Output current800mA
Current - quiescent5 mA
Operating temperature-40°C~125°C
PSRR75dB (120Hz)
PackageTape & Reel (TR); Cut Tape (CT)
CaseTO-252-3, DPak (2 Leads + Tab), SC-63
Protection featuresOver Current, Over Temperature
Number of regulators1
Output configurationPositive

Product details

Fixed 1.2V rail with 75dB ripple rejection

The LD1117DT12CTR is a 1.2V fixed-output LDO from STMicroelectronics, rated for 800mA continuous output current. Its 75dB PSRR at 120Hz means the output ripple is attenuated by a factor of ~5600 relative to the input — useful for powering analog front-ends, ADC/DAC reference buffers, or sensor rails where switching-regulator noise would corrupt the signal.

Dropout and thermal headroom at 800mA

Maximum dropout voltage is 1.3V at 800mA load. For a 1.2V output, the input rail must stay above 2.5V worst-case — a 3.3V rail with 5% tolerance (3.135V min) leaves 0.635V of headroom, which is tight but workable if the input is clean. The 5 mA quiescent current is typical for a low-dropout regulator of this output class; it adds 6 mW to the dissipation budget at 1.2V output.

DPAK package and industrial temperature range

Frequently asked questions

Is LD1117DT12CTR a suitable replacement for AMS1117-1.2?

Both are 1.2V fixed LDOs in similar packages, but the AMS1117-1.2 typically has a lower dropout (1.1V max at 800mA) and a narrower temperature range (0°C to 125°C). The LD1117DT12CTR offers wider industrial temperature coverage (-40°C to 125°C) and 75dB PSRR. Verify pin compatibility and thermal pad layout before substituting.

What protection features does the LD1117DT12CTR include?

The part integrates over-current and over-temperature protection — no under-voltage lockout or enable pin. The protection is self-recovering: the output folds back under fault and restarts when the condition clears.