FH2120-CB from XIN FEI HONG, 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	DO	output	Discharge control MOSFET gate connection. CMOS output driven to VDD (VDH = VDD-0.02V typ) in normal state and pulled to VSS (VDL = 0.2V typ) when overdischarge, discharge overcurrent, or load short-circuit is detected.
2	CO	output	Charge control MOSFET gate connection. CMOS output driven to VDD (VCH = VDD-0.02V typ) in normal state and pulled low (VCL = 0.2V typ, referenced to VM) when overcharge or charge overcurrent is detected.
3	VM	input	Overcurrent sense and charger-detection input. Monitors the pack P- node through R3 (typ 2 kΩ) to detect discharge overcurrent (VEC = 0.20V), load short-circuit (VSHORT = 1.0V), and charge overcurrent (VCHA = -0.21V). Absolute range VDD-28V to VDD+0.3V.
4	VC	input	Mid-point sense input: negative terminal of cell 1 and positive terminal of cell 2. Used together with VDD/VSS to measure both series cells independently for overcharge/overdischarge detection.
5	VDD	power_in	Positive supply input; connects to the positive terminal of cell 1 (pack +) through R1 (typ 330 Ω) with a 0.1 μF decoupling cap from VDD to VC. Absolute VDD-VC and VC-VSS range -0.3V to +8.0V.
6	VSS	power_in	Ground / negative supply input; connects to the negative terminal of cell 2 (pack B-) through R2 (typ 330 Ω) with a 0.1 μF cap from VC to VSS. Reference for all internal voltages.

Key specifications

Parameter	Value
Manufacturer	XIN FEI HONG
Package	SOT-23-6
Category	PMIC
Pins	6

Ordering variants

Same part, different packaging or reel option.

FH2120-CB
FH2120-CBDB
FH2120-CBNB

CAD (KiCad official)

Symbol: FH2120-CB
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
`fh2120-cb.step`	97 KB	You want the bare part, or you mark your own boards.
`fh2120-cb-etched.step`	1.7 MB	You want the part with `FH2120-CB` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 417 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: XIN FEI HONG datasheet (9 pp, sha256 90ce8097b75815d8, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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