CJU1117B-3.3 from Changjing, 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	GND	power_in	Ground return pin. On the fixed-voltage CJU1117B-3.3, pin 1 is the device ground reference. A 10uF tantalum bypass on the input side is referenced to this pin.
2	OUTPUT	power_out	Regulated 3.3V output pin (3.234V to 3.366V over 10mA-1A load, 4.8V <= VIN <= 12V). Requires a 22uF tantalum output capacitor for stability. Electrically shorted to the DPAK thermal tab.
3	IN	power_in	Unregulated input supply pin. Operating range 4.8V to 12V for the -3.3 variant (absolute max 20V). Requires a 10uF tantalum input capacitor for line-transient stability.
4	OUTPUT (TAB)	power_out	Exposed thermal tab on the back of the TO-252-2L package. Electrically connected to OUTPUT (pin 2) and used as the primary heat-sinking path; solder to a copper pour to reach the rated RthetaJA (46 C/W with adequate copper).

Key specifications

Parameter	Value
Manufacturer	Changjing
Package	TO-252-2
Category	PMIC
Pins	4

Ordering variants

Same part, different packaging or reel option.

CJU1117B-3.3

CAD (KiCad official)

Symbol: CJU1117B-3.3
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: Changjing datasheet (9 pp, sha256 9b166ec2c4e32cc8, 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