UA7805
Public Made by Adomby adom
TI fixed 5 V, 1.5 A positive linear regulator, TO-220. Internal thermal + short-circuit protection. Datasheet-verified.
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markdownUA7805
Texas Instruments · Fixed 5 V linear regulator (78xx) · TO-220
Fixed 5 V positive linear voltage regulator in a 3-terminal TO-220 package, the 7805 that has powered hobby and industrial boards for decades. Give it an unregulated input from about 7 V up to 35 V and it holds the output at 5 V while sourcing up to 1.5 A, with internal current limiting, safe-operating-area protection, and thermal shutdown so a short or overheat cannot destroy it. It needs roughly 2 V of headroom (dropout), so it is not an LDO. Add a small input and output capacitor and it is a complete supply.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | INPUT | power_in | Unregulated positive input voltage. Recommended 7.5 V to 20 V (35 V absolute max) for a 5-V output; requires ≥7.5 V to maintain line regulation. A 0.22-µF (or larger) ceramic bypass capacitor to GND is required when the regulator is far from the supply filter. |
| 2 | GND | power_in | Ground reference for both input and output. Also serves as the thermal reference; on TO-220/TO-263/SOT-223 the exposed tab/pad is electrically connected to this pin and should be tied to the ground plane for heat sinking. |
| 3 | OUTPUT | power_out | Regulated +5-V output (4.8 V to 5.2 V typical over line/load; 4.75 V to 5.25 V worst case). Delivers up to 1.5 A with adequate heat sinking; internally current-limited to ~2.1 A short-circuit. A 0.1-µF ceramic output capacitor to GND improves transient response but is not required for stability. |
Key specifications
| Parameter | Value |
|---|---|
| Type | Fixed positive linear regulator |
| Output voltage | 5 V fixed |
| Output current | up to 1.5 A |
| Input voltage | 7-35 V |
| Dropout | ~2 V (not LDO) |
| Protection | Current limit + SOA + thermal shutdown |
| Line regulation | typ. 4 mV |
| Package | TO-220 (3-lead) |
Ordering variants
Same part, different packaging or reel option.
UA7805CKC (TO-220)UA7805CKCS (TO-220, short shipping)
CAD (KiCad official)
- Symbol:
Regulator_Linear:uA7805 - Footprint:
Package_TO_SOT_THT:TO-220-3_Vertical - 3D model: TO-220 (KiCad packages3D)
- 3D model files:
ua7805-etched.step/ua7805-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ua7805.step/ua7805.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (37 pp, sha256
ce0caf2298560e42, retrieved 2026-08-17, tier: manufacturer) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).