BL8518CB3TR263DC from BL Shanghai Belling, in a SOT-23. 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	VSS	power_in	Ground reference pin. Tie to system 0 V / GND.
2	VOUT	output	Voltage-detection output, active-low CMOS push-pull (C suffix). Drives low (VSS) when VDD falls below the 2.63 V detector threshold, and returns high (equal to VDD) after Tdelay = 200 ms typical once VDD rises above the threshold. Output is undefined when VDD < VDDL (~0.5 V).
3	VDD	power_in	Supply voltage input and monitored rail. Recommended operating range 1.2 V to 6 V; absolute maximum 8 V. This is also the voltage being sensed against the internal 2.63 V threshold.

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	SOT-23
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

BL8518CB3TR263DC
BL8518CB3TR263DN
BL8518CB3TR293DC
BL8518CB3TR293DN
BL8518CB3TR263DCCB3BTR263DC
BL8518CB3TR263DCCB3BTR263DN
BL8518CB3TR263DCCB3BTR293DC
BL8518CB3TR263DCCB3BTR293DN

CAD (KiCad official)

Symbol: BL8518CB3TR263DC
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D, STEP)

Provenance

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

Datasheet: BL Shanghai Belling datasheet (7 pp, sha256 4f4f63773eb3a024, 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