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)

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).

Datasheet PDF