LM7805MP/NOPB
Texas Instruments
MOQ 1 · Tape & Reel (TR) Cut Tape (CT) · RoHS · EIA-481 · DAP/DDP · T/T
Technical specifications
| Parameter / Attribute | Specification / Value |
|---|---|
| Output type | Fixed |
| Mounting | Surface Mount |
| Voltage - input | 35V |
| Voltage dropout | 2V @ 1A |
| Voltage - output (Min (Fixed)) | 5V |
| Output current | 1.5A |
| Current - quiescent | 8 mA |
| Operating temperature | 0°C ~ 125°C |
| PSRR | 80dB (120Hz) |
| Package | Tape & Reel (TR) Cut Tape (CT) |
| Case | TO-261-4, TO-261AA |
| Protection features | Over Temperature, Short Circuit |
| Number of regulators | 1 |
| Output configuration | Positive |
Need Stock or a Drop-in Second-Source for LM7805MP/NOPB?
Package: TO-220 / TO-92 (78L) / DPAK · Pin-compatible replacements with immediate Shenzhen spot stock
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)
The 100mA Member - Big Package Not Required
Shenzhen Spot Stock (24-48h Dispatch)
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.
The 500mA Middle Rung
Shenzhen Spot Stock (24-48h Dispatch)
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.
The Negative Mirror - Different Wiring Entirely
Shenzhen Spot Stock (24-48h Dispatch)
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.
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.