HY2120-LB from HYCON Tech, in a SOT-23-6. 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	OD	output	MOSFET gate connection pin for discharge control. Drives the discharge-path N-MOSFET (M1). Output 'H' = VDD-0.02V typ, output 'L' = 0.2V typ; V_OD absolute max VSS-0.3 to VDD+0.3 V.
2	OC	output	MOSFET gate connection pin for charge control. Drives the charge-path N-MOSFET (M2). Output 'H' = VDD-0.02V typ, output 'L' = 0.2V typ; high-withstanding-voltage pin, V_OC absolute max VDD-33 to VDD+0.3 V.
3	CS	input	Input pin for current sense and charger detect. Senses the voltage across the external MOSFET stack for discharge-overcurrent, short-circuit, and charge-overcurrent detection; also detects charger insertion. High-withstanding-voltage pin, V_CS absolute max VDD-33 to VDD+0.3 V. Typically connected to PB- through a 2kΩ resistor.
4	VC	input	Center-tap input for the two-cell battery stack. Connects to the node between Cell1 and Cell2 through a 330Ω resistor with a 0.1µF filter cap to VSS; enables per-cell overcharge/overdischarge monitoring.
5	VDD	power_in	Positive supply pin (connects to the top of the 2-cell stack, PB+). Operating range 1.5V to 10V; absolute max VSS-0.3 to VSS+10V. Typical supply current 5µA (9µA max) at VDD=7.8V; 0.1µA max power-down at VDD=4.0V. Bypass with 0.1µF cap to VSS, feed via 330Ω series resistor.
6	VSS	power_in	Ground pin. Reference for all internal circuitry; connects to the bottom of the 2-cell stack (Cell2 negative terminal).

Key specifications

Parameter	Value
Manufacturer	HYCON Tech
Package	SOT-23-6
Category	PMIC
Pins	6

Ordering variants

Same part, different packaging or reel option.

HY2120-LB

CAD (KiCad official)

Symbol: HY2120-LB
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`hy2120-lb.step`	97 KB	You want the bare part, or you mark your own boards.
`hy2120-lb-etched.step`	1.5 MB	You want the part with `HY2120-LB` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 389 faces against 117 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: HYCON Tech datasheet (22 pp, sha256 844f87e84a0b25dc, 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