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L7805CDT-TR

STMicroelectronics

STMicroelectronics L7805CDT-TR, fixed 5V positive linear regulator, 1.5A output, DPAK (TO-252) surface-mount package, 62dB PSRR at 120Hz.

STMicroelectronics L7805CDT-TR
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MOQ 5 · 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

L7805CDT-TR specifications
Parameter / AttributeSpecification / Value
Output typeFixed
MountingSurface Mount
Voltage - input35V
Voltage dropout2V @ 1A (Typ)
Voltage - output (Min (Fixed))5V
Output current1.5A
Current - quiescent8 mA
Operating temperature0°C~125°C
PSRR62dB (120Hz)
PackageTape & Reel (TR); Cut Tape (CT)
CaseTO-252-3, DPak (2 Leads + Tab), SC-63
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 L7805CDT-TR?

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 L7805CDT-TR 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 L7805CDT-TR 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 L7805CDT-TR 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 L7805CDT-TR is a fixed 5V positive linear regulator from STMicroelectronics, rated for 1.5A continuous output. The DPAK (TO-252) surface-mount package means the tab is the output node and the primary heat path — if the board layout skips the copper pour under the tab, the thermal shutdown will cycle before you reach 1.5A. PSRR is 62 dB at 120 Hz — that's the ripple rejection on the 5V rail for a full-wave-rectified input. For an analog supply feeding an op-amp or ADC reference, that 62 dB keeps 120 Hz ripple down to a few millivolts at the output.

Dropout, quiescent, and the thermal budget

Maximum dropout is 2V at 1A load, typical is lower. That means you need at least 7V on the input to hold regulation at full current — budget 8V for margin. Quiescent current is 8 mA, which is the overhead the regulator burns even with no load; on a battery-powered board that 8 mA is a standing drain. Input voltage max is 35V — don't push it past that; the absolute max is higher but the safe operating area shrinks fast above 35V.

The L7805 base number has been in production for decades.

L7805CDT-TR
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