BL1117-ADJCY from BL Shanghai Belling, in a TO-252-2. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	Adj	input	Adjust pin. Feedback input regulated to 1.25 V (Vref) reference. Output voltage set by Vout = 1.25 x (1 + R2/R1) + IAdj x R2 using external resistor divider (R1 recommended <=125 ohm to meet minimum load, and <=625 ohm for stability). IAdj is typically 55 uA (max 120 uA).
2	Vout	power_out	Regulated output. Delivers up to 1 A. Requires a 10 uF tantalum or MLCC output capacitor for stability (ESR 3 mOhm to 22 Ohm). On TO-252 the exposed tab is electrically the Vout pin.
3	Vin	power_in	Unregulated supply input. Recommended operating range up to 12 V (absolute max 15 V). Requires a 10 uF tantalum or MLCC bypass capacitor. Must exceed Vout by at least the dropout voltage (~1.3 V at 1 A).

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	TO-252-2
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

BL1117-ADJCY
BL1117-ADJCYADJAY
BL1117-ADJCX
BL1117-ADJCYADJAX

CAD (KiCad official)

Symbol: BL1117-ADJCY
Footprint: Package_TO_SOT_SMD:TO-252-2
3D model: TO-252-2 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: BL Shanghai Belling datasheet (15 pp, sha256 a7fe7f5c0846d4ca, retrieved 2026-08-17, tier: lcsc)
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