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STMicroelectronics L7805ACD2T — Power Management (PMIC / Gate Driver)

ST L7805ACD2T 5V Fixed Regulator, 1.5A, TO-263, Obsolete

MPNL7805ACD2T
Obsolete

STMicroelectronics L7805ACD2T, 5V fixed positive voltage regulator, 1.5A output, 68 dB PSRR (120 Hz), TO-263-3 D²Pak surface mount, 0°C to 125°C.

$1.0300Ref. price · indicative, final on quote
STMicroelectronics L7805ACD2T datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

L7805ACD2T specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input35V
Voltage dropout2V @ 1A (Typ)
Voltage - output (Min (Fixed))5V
Output current1.5A
Current - quiescent6 mA
Operating temperature0°C ~ 125°C
PSRR68dB (120Hz)
PackageTube
CaseTO-263-3, D²Pak (2 Leads + Tab), TO-263AB
Protection featuresOver Temperature, Short Circuit
Number of regulators1
Output configurationPositive

Product details

5 V fixed rail with 68 dB ripple rejection — what the PSRR buys

The ST L7805ACD2T is a fixed 5 V positive voltage regulator delivering up to 1.5 A continuous output. Its 68 dB PSRR at 120 Hz is the spec that matters for analog supply rails — it attenuates full-wave rectified mains ripple by a factor of ~2500, so a 1 Vpp ripple at the input becomes under 0.4 mVpp on the output. That keeps 5 V rails clean for op-amps, ADCs, and sensor front-ends without a post-filter LDO.

1.5 A output and dropout headroom

At 1 A load the typical dropout is 2 V maximum, meaning the input must stay above 7 V to maintain regulation. With a 35 V absolute input ceiling, the part handles unregulated DC from a 24 VAC transformer rectified to ~34 V — common in industrial control panels. The 6 mA quiescent current is negligible against the load budget.

TO-263 D²Pak — surface-mount power package

The TO-263-3 (D²Pak) package has a large copper tab on the back for heat sinking through the PCB.

Obsolete — sourcing through the spot market

Frequently asked questions

Is the L7805ACD2T obsolete and what are my alternatives?

Yes, the L7805ACD2T is listed as obsolete. The closest same-function alternative is another 5 V fixed regulator in a TO-263 package from the same L78 family, but pin compatibility and exact dropout/PSRR must be verified against the original design's requirements. For legacy repairs, the original code is still available through surplus channels.

Can the L7805ACD2T handle 1.5 A output current?

Yes, the L7805ACD2T is rated for 1.5 A continuous output. At that current the input-output differential must be managed — typical dropout at 1 A is 2 V max, and the TO-263 package needs adequate PCB copper area to dissipate the power without exceeding the 125 °C junction limit.

What is the L7805ACD2T's PSRR?

The L7805ACD2T has a PSRR of 68 dB at 120 Hz. This means it attenuates 120 Hz ripple from full-wave rectified mains by a factor of roughly 2500, making it suitable for powering analog circuits directly from a rectified supply without an additional LDO.