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Texas Instruments LM7805S/NOPB — Power Management (PMIC / Gate Driver)

LM7805S/NOPB – TI 5V Fixed 1.5A Linear Regulator

MPNLM7805S/NOPB
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Texas Instruments LM7805S/NOPB – 5V fixed positive linear regulator, 1.5A output, 80dB PSRR at 120Hz, surface-mount DDPAK/TO-263-3 package.

$2.2700Ref. price · indicative, final on quote
Texas Instruments LM7805S/NOPB datasheet (PDF)
PackagingTO-263-4, D²Pak (3 Leads + Tab), TO-263AA
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LM7805S/NOPB specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input35V
Voltage dropout2V @ 1A
Voltage - output (Min (Fixed))5V
Output current1.5A
Current - quiescent8 mA
Operating temperature0°C~125°C
PSRR80dB (120Hz)
PackageTube
CaseTO-263-4, D²Pak (3 Leads + Tab), TO-263AA
Protection featuresOver Temperature, Short Circuit
Number of regulators1
Output configurationPositive

Product details

5V fixed rail, 1.5A continuous, 80 dB ripple rejection

The LM7805S/NOPB is a fixed 5V output linear regulator from Texas Instruments, rated for 1.5A continuous output current. Its 80 dB PSRR at 120 Hz means the output sees less than 0.1 mV ripple for every 1 V of 120 Hz input ripple — a clean rail for analog or mixed-signal loads. The 2 V dropout at 1 A sets the minimum input headroom: with a 5 V output, the input must stay above 7 V to regulate. Below that, the output follows the input minus the dropout voltage.

Surface-mount DDPAK/TO-263-3 — thermal and footprint

At 1.5 A output, the tab-to-ambient thermal resistance depends on the board copper area — a 1 in² pad typically keeps the junction below 125 °C at 25 °C ambient. The 8 mA quiescent current is drawn regardless of load — at light loads this adds to the power dissipation budget. Over-temperature and short-circuit protection are built in, so the regulator survives a sustained output short without damage.

For volume requirements or lead-time confirmation, the part is sourced per RFQ. The base product number LM7805 covers the through-hole TO-220 variant (LM7805CT) and other package options, but the surface-mount DDPAK version is a distinct footprint — confirm the BOM position before substituting.

Frequently asked questions

Can LM7805S/NOPB replace the through-hole LM7805CT?

Electrically the same — both are 5V fixed, 1.5A regulators with the same dropout and protection. The difference is the package: LM7805S/NOPB is surface-mount DDPAK/TO-263-3, while LM7805CT is through-hole TO-220. The pinout is functionally identical (input, ground, output), but the DDPAK tab is the output terminal and must be soldered to a PCB copper plane for thermal management. A direct swap requires a board layout change.

What is the PSRR of LM7805S/NOPB and why does it matter?

The PSRR is 80 dB at 120 Hz. This means the regulator attenuates 120 Hz ripple (from a full-wave rectifier) by a factor of 10,000 — a 1 V peak-to-peak ripple on the input becomes 0.1 mV on the output. For powering sensitive analog circuits like op-amps or ADCs, this reduces the need for additional post-filtering.