Overview
The CH438Q is a RS232 IC made by WCH (Nanjing Qinheng Microelectronics) in a LQFP-44(10x10) package with 44 pins. -40℃~+85℃ 128Byte 3.3V~5.3V 40mA 4Mbps 8 Internal Oscillator LQFP-44(10x10) UART ROHS.
PCBKit's library has its KiCad symbol (EasyEDA_Cloud:CH438Q, from EasyEDA) and its footprint (Package_QFP:LQFP-44_10x10mm_P0.8mm, from KiCad's library), ready for a KiCad board. JLCPCB lists it (part C100039).
Symbol
Footprint
Pinout
44| Pin | Name | Type |
|---|---|---|
| 1 | WR# | Unspecified |
| 2 | VCC | Unspecified |
| 3 | GND | Unspecified |
| 4 | A6/ALE | Unspecified |
| 5 | A5 | Unspecified |
| 6 | A4 | Unspecified |
| 7 | A3 | Unspecified |
| 8 | A2 | Unspecified |
| 9 | A1 | Unspecified |
| 10 | A0 | Unspecified |
| 11 | RXD4 | Unspecified |
| 12 | TXD4 | Unspecified |
| 13 | TXD3 | Unspecified |
| 14 | GND | Unspecified |
| 15 | RXD3 | Unspecified |
| 16 | VCC | Unspecified |
| 17 | GND | Unspecified |
| 18 | XI | Unspecified |
| 19 | XO | Unspecified |
| 20 | RXD2 | Unspecified |
| 21 | TXD2 | Unspecified |
| 22 | TXD1 | Unspecified |
| 23 | RXD1 | Unspecified |
| 24 | TXD5 | Unspecified |
| 25 | RXD5 | Unspecified |
| 26 | TXD6 | Unspecified |
| 27 | RXD6 | Unspecified |
| 28 | TXD7 | Unspecified |
| 29 | RXD7 | Unspecified |
| 30 | TXD0 | Unspecified |
| 31 | RXD0 | Unspecified |
| 32 | INT | Unspecified |
| 33 | RST# | Unspecified |
| 34 | D7 | Unspecified |
| 35 | D6 | Unspecified |
| 36 | D5 | Unspecified |
| 37 | D4 | Unspecified |
| 38 | D3 | Unspecified |
| 39 | D2 | Unspecified |
| 40 | D1 | Unspecified |
| 41 | D0 | Unspecified |
| 42 | AMOD | Unspecified |
| 43 | CS# | Unspecified |
| 44 | RD# | Unspecified |
Parts like it
4
MAX240CMH+D
MQFP-44(10x10)0℃~+70℃ 120Kbps 4.5V~5.5V 5 5 Transceiver MQFP-44(10x10) RS232 ICs ROHSMaxim Integrated (Analog Devices)RS232 ICsHIN240CN
MQFP-44(10x10)Short-Circuit Protection MQFP-44(10x10) RS232 ICsRenesas ElectronicsRS232 ICsHIN240CN
MQFP-44(10x10)0℃~+70℃ 120Kbps 4.5V~5.5V 5 5 Short-Circuit Protection Transceiver Yes MQFP-44(10x10) RS232 ICsTexas InstrumentsRS232 ICsHIN240IN
MQFP-44(10x10)-40℃~+85℃ 300Kbps 5 5 5V Transceiver Yes MQFP-44(10x10) RS232 ICsTexas InstrumentsRS232 ICs
Questions
Is there a KiCad symbol and footprint for the CH438Q?
Yes. The symbol is EasyEDA_Cloud:CH438Q and the footprint Package_QFP:LQFP-44_10x10mm_P0.8mm, both drawn on this page. PCBKit places them on a board for you when you design with it.
What package is the CH438Q?
LQFP-44(10x10), with 44 pins. Its footprint is drawn on this page.
Where is the CH438Q datasheet?
WCH (Nanjing Qinheng Microelectronics) publishes it: the Datasheet link on this page opens it.
Where can I order the CH438Q?
JLCPCB lists it as part C100039, with 0 in stock; the sellers' links on this page open their listings.
What can replace the CH438Q?
Parts like it in the library: the MAX240CMH+D by Maxim Integrated (Analog Devices), the HIN240CN by Renesas Electronics, the HIN240CN by Texas Instruments and the HIN240IN by Texas Instruments. Check their datasheets: a part that fits the footprint may still differ in its ratings.