RH7901A from RONGHE Microelectronics, in a SOT-23-5L. 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	NC	unconnected	No internal connection. On the base RH7901 variant this pin is the CB configuration input, but on RH7901A the Divider3 protocol is fixed internally so the pin is left unconnected.
2	GND	power_in	Negative supply / ground reference (0 V).
3	VDD	power_in	Positive supply pin. Operating range 4.5 V to 5.5 V (typ 5.0 V), typical operating current 140 uA, LVR threshold 4.0 V.
4	DP	bidirectional	Connects to the USB port's D+ or D- line (see application circuit). In fixed Divider3 (12W) mode the DP/DM to D+/D- connection order is unrestricted. Drives 2.7 V nominal for Divider3 handshake. ESD >8 kV HBM.
5	DM	bidirectional	Connects to the USB port's D- or D+ line (see application circuit). In fixed Divider3 (12W) mode the DP/DM to D+/D- connection order is unrestricted. Drives 2.0 V nominal for the paired handshake voltage. ESD >8 kV HBM.

Key specifications

Parameter	Value
Manufacturer	RONGHE Microelectronics
Package	SOT-23-5L
Category	Interface
Pins	5

Ordering variants

Same part, different packaging or reel option.

RH7901A
RH7902
RH7902A
RH7902B

CAD (KiCad official)

Symbol: RH7901A
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5L (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`rh7901a.step`	85 KB	You want the bare part, or you mark your own boards.
`rh7901a-etched.step`	1.3 MB	You want the part with `RH7901A` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 340 faces against 102 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: RONGHE Microelectronics datasheet (9 pp, sha256 3b28b7a4e97633ee, 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