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LM7805MPX/NOPB

Texas Instruments

Texas Instruments LM7805MPX/NOPB, 5V fixed-output positive linear regulator, 1.5A output current, SOT-223-4 surface-mount package, PSRR 80dB at 120Hz, 0°C to 125°C operating temperature range.

Texas Instruments LM7805MPX/NOPB
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[IN STOCK] In Stock: 991 pcs
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MOQ 1 · Tape & Reel (TR); Cut Tape (CT) · RoHS · EIA-481 · DAP/DDP · T/T

[ORIGINAL SEALED] [PRE-SHIP HD PHOTOS] [30D WARRANTY · COC] [TRACKED DAP/DDP]

Technical specifications

LM7805MPX/NOPB specifications
Parameter / AttributeSpecification / Value
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)
PackageTape & Reel (TR); Cut Tape (CT)
CaseTO-261-4, TO-261AA
Protection featuresOver Temperature, Short Circuit
Number of regulators1
Output configurationPositive
100% Footprint Match · Solder-Ready (No PCB Redesign Needed)

Need Stock or a Drop-in Second-Source for LM7805MPX/NOPB?

Package: TO-220 / TO-92 (78L) / DPAK · Pin-compatible replacements with immediate Shenzhen spot stock

Footprint Match 98%
Supply Chain & Allocation Reality:

The 7805 is the most-produced linear regulator in history - five volts, three pins, a heatsink tab - and its family is the most casually substituted row of parts on any bench. The middle letter is the current grade and the packages follow it: 78L05 is 100mA in TO-92, 78M05 is 500mA class, the plain 7805 is 1A in TO-220. Downward substitutions work when the load fits; upward ones need the space and the heatsink. Two traps close the story: the 79xx negative series shares the family name and nothing else, and the low-dropout parts (1117 class) have quietly replaced the 7805 in 3.3V designs where the 2V dropout of a 7805 simply cannot regulate.

Verified Pin-Compatible Replacements (3 verified alternatives)

78L05 Multiple fabs TO-92
Functional Equivalent
Availability & Target Pricing:

The 100mA Member - Big Package Not Required

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The TO-92 grade of the same regulator: 100mA output against the 1A of the TO-220 part, same 5V fixed output, same 2V-class dropout.

Same input window; dissipation is the tiny body limit - bias and standby rails only.

Compatibility & Drop-In Notes: Substitution direction rule: a higher-rated part can serve a lower-rated position when it physically fits (a 7805 standing in for a 78L05 is fine and current-rich); the reverse fits the socket but starves the load at the worst moment.
Package & Solder Footprint: TO-92 against TO-220: lead order follows the package drawing, not the family habit - verify, because the pinouts do differ between grades.
Shenzhen Warehouse Stock & MOQ: Commodity stock everywhere; the bias-rail part in every drawer.
Request Volume Quote for 78L05 Compare LM7805MPX/NOPB vs 78L05 Spec Matrix
78M05 Multiple fabs TO-220 / DPAK (medium)
Functional Equivalent
Availability & Target Pricing:

The 500mA Middle Rung

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The medium grade: 500mA class output (some vendors rate closer to the full ampere - read the specific datasheet).

Same 5V output and dropout class; dissipation scales with the smaller die.

Compatibility & Drop-In Notes: The current grade is the specification - the family name hides it in one letter. When a regulator runs hot in a design, the first question of this family is which grade the BOM actually specified.
Package & Solder Footprint: DPAK versions put the tab on the output node in some makers - the mechanical drawing decides.
Shenzhen Warehouse Stock & MOQ: Wide stock; grade printed on the body.
Request Volume Quote for 78M05 Compare LM7805MPX/NOPB vs 78M05 Spec Matrix
L7905 STMicroelectronics / TI TO-220
Functional Equivalent
Availability & Target Pricing:

The Negative Mirror - Different Wiring Entirely

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The negative-rail counterpart: -5V at the same 1A class - the 79xx family mirrors the 78xx ratings across the entire row.

Negative supplies only; the pin order is NOT the mirrored connector of the 7805 - the ground pin sits differently and the tab follows the input side.

Compatibility & Drop-In Notes: The classic repair error this entry exists for: a 7805 pressed into a 7905 socket (or the reverse) sometimes looks like it almost works and then shorts the rail. The 78 and the 79 are relatives in name only.
Package & Solder Footprint: TO-220 with the 79xx pin arrangement - read the drawing, never the memory.
Shenzhen Warehouse Stock & MOQ: Stocked as the pair for analog and audio repair.
Request Volume Quote for L7905 Compare LM7805MPX/NOPB vs L7905 Spec Matrix
Buyer & Quality Checklist for Sourcing Alternatives
  • The grade letter is the current rating: 78L05 = 100mA (TO-92), 78M05 = 500mA class, 7805 = 1A (TO-220), 78S/T = 2-3A in large cans. Higher grades substitute downward; lower grades do not substitute upward.
  • Dropout is the other hidden number: the 78xx family needs 2V to 2.5V of input headroom. The 1117-class LDOs (AMS1117 and relatives) sit near 1.1V. A 7805 is not a replacement for a 1117 in any design whose input margin was computed for low dropout - the output just sags.
  • 78xx versus 79xx: positive against negative rails, and the pinouts are different in a way that punishes memory. Read the datasheet drawing of the exact part.
  • Dissipation is the real design: (Vin minus 5V) times current, in watts, given to a TO-220 or a TO-92 body. A "1A" regulator at 12V input delivering 500mA burns 3.5W and needs the heatsink the schematic never drew.
  • The output capacitor small print: the classic 78xx wants the output decoupling the old datasheets specify; in modern low-ESR cap designs, some vendors note stability margins change - check the specific datasheet note.
  • Counterfeits are as old as the part: source 78xx from documented lots, and distrust cases where a "1A" part dies at 300mA cold - the die tells the truth the marking does not.
Frequently Asked Technical Questions

Q: What is the difference between 7805, 78L05 and 78M05?

A: Current grade and package: 78L05 is 100mA in TO-92, 78M05 is 500mA class, the plain 7805 is 1A in TO-220. Same 5V output and same 2V-class dropout; the letter is the die size.

Q: Can a 7805 replace a 7905 or vice versa?

A: No - the 78xx family regulates positive rails and the 79xx negative, with different pinouts. They belong to different circuits; the family name rhymes, the wiring does not.

Q: Why does my circuit sag when I replaced a 1117 regulator with a 7805?

A: Dropout: the 1117-class LDO needs about 1.1V of headroom, the 7805 needs over 2V. In a design sized around low dropout the 7805 simply cannot regulate, and the output follows the input minus dropout.

Technical details

The LM7805MPX/NOPB is a fixed 5 V output linear regulator from the classic 78xx family, re-packaged for surface-mount assembly. The headline spec is 80 dB power-supply rejection ratio at 120 Hz — that's the ripple-kill figure for full-wave-rectified mains. For a 1 A load on a 12 V bus, this part cleans up the rectifier hash before it reaches sensitive analog or mixed-signal circuitry.

1.5 A output, 2 V dropout — sizing the headroom

Rated 1.5 A continuous output with a 2 V maximum dropout at 1 A. That means the input must stay at least 7 V to hold regulation at full load. The 8 mA quiescent current is typical for a bipolar linear regulator — nothing exotic, but the thermal budget in the SOT-223 package needs the board copper to pull heat away. Over-temperature and short-circuit protection are built in, so a momentary overload won't kill the part.

SOT-223 on tape-and-reel — assembly line fit

Packaged in a TO-261-4 (SOT-223) surface-mount body, supplied on tape-and-reel or cut tape. The SOT-223 footprint is standard — three signal pins plus the large tab that doubles as the ground connection and the primary heat path. The 'NOPB' suffix confirms lead-free / RoHS-compliant construction.

LM7805MPX/NOPB
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