# RH7901

**RONGHE Microelectronics** · USB Converters · SOT-23-5

RH7901 from RONGHE Microelectronics, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | CB | input | Divider-mode select input: CB=0 (tied to GND) configures Divider3 (12W) for the RH7901, while CB=1 or floating configures Divider1/2. |
| 2 | GND | power_in | Negative power supply (ground) pin. |
| 3 | VDD | power_in | Positive power supply pin; the datasheet specifies VDD operation from 4.5 V to 5.5 V with absolute maximum of 5.5 V. |
| 4 | DP1 | bidirectional | CMOS input/output connected to the first USB port D+ line (DP) of the charging port. |
| 5 | DM1 | bidirectional | CMOS input/output connected to the first USB port D- line (DM) of the charging port. |

## Key specifications

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

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage (absolute maximum) | VDD | -0.3 |  | 5.5 | V |  | 7 |
| Input/output voltage (absolute maximum) | VI / VO | -0.5 |  |  | V | Upper limit printed as VDD +0.5 V | 7 |
| Operating temperature | TOPR | -20 |  | 85 | ℃ |  | 7 |
| Storage temperature | TSTG | -50 |  | 125 | ℃ |  | 7 |
| ESD level (DP/DM, HBM) | VESD | 8000 |  |  | V | DP/DM, HBM; printed as >8000 | 7 |
| Operating voltage | VDD | 4.5 | 5 | 5.5 | V |  | 7 |
| DP/DM voltage, DP | VDP | 2.57 | 2.7 | 2.84 | V | VDD =5.0v | 7 |
| DP/DM voltage, DM | VDM | 1.9 | 2 | 2.1 | V |  | 7 |
| Operating current, normal mode | IDD |  | 140 |  | uA | 正常模式 (normal mode) | 7 |
| Operating current, LVR reset | IDD |  | 55 |  | uA | LVR复位(*); USB charging protocol port control disabled | 7 |
| LVR voltage | VLVR |  | 4 |  | V |  | 7 |

## CAD (KiCad official)

- Symbol: `RH7901`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `rh7901-etched.step` / `rh7901-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rh7901.step` / `rh7901.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [RONGHE Microelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586175242377039872) (9 pp, sha256 `3b28b7a4e97633ee`, retrieved 2026-10-18, 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:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/rh7901-datasheet.pdf)