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CH9101R
Public Made by Adomby adom
WCH(Jiangsu Qin Heng) USB Converters, QSOP-16-150mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownCH9101R
WCH(Jiangsu Qin Heng) · USB Converters · QSOP-16-150mil
CH9101R from WCH(Jiangsu Qin Heng), in a QSOP-16-150mil. 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 | TXD | output | Serial data output of the UART, idle state is high. |
| 2 | RTS | output | MODEM handshake output, request to send, active low; if an external pull-down is detected on RTS at power-up, the EEPROM configuration is disabled and chip default parameters are used. |
| 3 | VIO | power_in | I/O port supply input (1.8V to 5V supported) that requires an external decoupling capacitor. |
| 4 | RXD | input | Serial data input of the UART with internal pull-up resistor, idle state is high. |
| 5 | GND | power_in | Common ground, must be connected to the ground line of the USB bus. |
| 6 | CTS | input | MODEM handshake input, clear to send, active low. |
| 7 | DSR | input | MODEM handshake input, data set ready, active low; default function is TXS, switchable to DSR via EEPROM configuration. |
| 8 | UD+ | bidirectional | USB D+ data line connected directly to the USB bus, no series resistor allowed. |
| 9 | UD- | bidirectional | USB D- data line connected directly to the USB bus, no series resistor allowed. |
| 10 | V3 | power_in | Internal regulator output and core/USB supply input; connect to VDD5 when VDD5 is below 3.6V, or use an external decoupling capacitor (about 0.1uF) when VDD5 is above 3.6V. |
| 11 | RESET# | input | External reset input, active low, with internal pull-up resistor. |
| 12 | VDD5 | power_in | Positive supply input of the power regulator (4.0V to 5.5V typical, or 3.0V to 3.6V when tied to V3), requires an external decoupling capacitor. |
| 13 | GND | power_in | Common ground, must be connected to the ground line of the USB bus. |
| 14 | RI | input | MODEM handshake input, ring indicator, active low; default function is RXS, switchable to RI via EEPROM configuration. |
| 15 | DCD | input | MODEM handshake input, carrier detect, active low; default function is TNOW, switchable to DCD via EEPROM configuration. |
| 16 | DTR | output | MODEM handshake output, data terminal ready, active low; default function is SUSPEND, switchable to DTR via EEPROM configuration. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | WCH(Jiangsu Qin Heng) |
| Package | QSOP-16-150mil |
| Category | Interface |
| Pins | 16 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| USB supply voltage, V3 not tied to VDD5 | VDD5 | 4 | 5 | 5.5 | V | V3 pin not connected to VDD5, V3 with capacitor | 6 |
| USB supply voltage, V3 tied to VDD5 | VDD5 | 3 | 3.3 | 3.6 | V | V3 pin connected to VDD5, VDD5 = V3 | 6 |
| I/O supply voltage | VIO | 1.7 | 5 | 5.5 | V | 6 | |
| Operating supply current | IVDD | 3 | 15 | mA | VDD5 or V3 supply current in operation | 6 | |
| VIO operating supply current | IVIO | 0 | 10 | mA | depends on I/O load | 6 | |
| Suspend supply current VDD5 | ISLP | 0.09 | 0.16 | mA | USB suspend, VDD5 = 5V | 6 | |
| Suspend supply current VDD5=V3 | ISLP | 0.085 | 0.15 | mA | USB suspend, VDD5 = V3 = 3.3V | 6 | |
| Suspend supply current VIO | ISLP | 0.002 | 0.05 | mA | USB suspend, VIO supply, no I/O load/pull-up | 6 | |
| Internal regulator external load capability | ILDO | 10 | mA | 6 | |||
| Low-level input voltage | VIL | 0 | 1.5 | V | VIO = 5V | 6 | |
| Low-level input voltage | VIL | 0 | 0.9 | V | VIO = 3.3V | 6 | |
| Low-level input voltage | VIL | 0 | 0.5 | V | VIO = 1.8V | 6 | |
| High-level input voltage | VIH | 2.5 | V | VIO = 5V | 6 | ||
| High-level input voltage | VIH | 1.9 | V | VIO = 3.3V | 6 | ||
| High-level input voltage | VIH | 1.3 | V | VIO = 1.8V | 6 | ||
| Low-level output voltage | VOL | 0.4 | 0.5 | V | VIO = 5V, sink 15mA | 6 | |
| Low-level output voltage | VOL | 0.3 | 0.4 | V | VIO = 3.3V, sink 8mA | 6 | |
| Pull-up current | IPUP | 35 | 150 | 220 | uA | VIO = 5V, pulled up to VIO | 6 |
| Pull-up current | IPUP | 15 | 60 | 90 | uA | VIO = 3.3V, pulled up to VIO | 6 |
| Pull-up current | IPUP | 3 | 14 | 21 | uA | VIO = 1.8V, pulled up to VIO | 6 |
| V3 power-on reset/low-voltage reset threshold | VRV3 | 2.5 | 2.7 | 2.9 | V | 6 | |
| HBM ESD withstand voltage | VESD | 5 | 6 | KV | USB or I/O pins | 6 | |
| Internal clock error | FD | -1 | 0.5 | 1 | % | TA = -15℃～60℃ | 6 |
| Internal clock error | FD | -1.6 | 0.8 | 1.6 | % | TA = -40℃～85℃ | 6 |
| Reset delay after power-up or external reset | TRSTD | 9 | 15 | 25 | mS | 7 | |
| RESET external input valid pulse width | TRI | 100 | nS | 7 | |||
| USB auto-suspend detection time | TSUSP | 3 | 5 | 9 | mS | 7 | |
| Wake-up completion time after sleep | TWAKE | 1.2 | 1.5 | 5 | uS | 7 | |
| Operating ambient temperature | TA | -40 | 85 | ℃ | 6 | ||
| Storage ambient temperature | TS | -55 | 125 | ℃ | 6 | ||
| USB supply voltage | VDD5 | -0.5 | 6 | V | VDD5 pin supply, GND grounded | 6 | |
| Serial I/O supply voltage | VIO | -0.5 | 6 | V | VIO pin supply, GND grounded | 6 | |
| Voltage on USB signal pins | VUSB | -0.5 | V | max is V3+0.5 | 6 | ||
| Voltage on UART and other pins | VUART | -0.5 | V | max is VIO+0.5 | 6 |
CAD (KiCad official)
- Symbol:
CH9101R - Footprint:
Package_SO:QSOP-16_3.9x4.9mm_P0.635mm - 3D model: QSOP-16-150mil (KiCad packages3D, STEP)
- 3D model files:
ch9101r-etched.step/ch9101r-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ch9101r.step/ch9101r.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: WCH(Jiangsu Qin Heng) datasheet (11 pp, sha256
bf63e9605a1cf908, retrieved 2026-10-23, 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, primaryclaude-sonnet-5-5(text), consensusclaude-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).