Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Package | LQFP-128(14×14) |
| Supply voltage | 3.3V~5.3V |
| Data Rate | 4Mbps |
| Number of Channels | 8 |
| Operating Temperature | -40℃~+85℃;-40℃~+65℃ |
| Features | Supports MODEM signals;Supports hardware flow control signals CTS & RTS auto-handshake and auto-baud rate control;Supports serial port frame error detection;Supports Break line interval detection;Built-in clock oscillator;Supports serial port low-power sleep mode |
| Current – Supply | 10mA |
Product Overview
CH438L is a WCH UART interface controller identified by the exact orderable code CH438L. Its confirmed technical identity includes Supply voltage 3.3V~5.3V, Data Rate 4Mbps, Number of Channels 8, Operating Temperature -40℃~+85℃;-40℃~+65℃.
The exact device is described as: 4Mbps 8 LQFP-128(14×14) UARTs (Universal Asynchronous Receiver Transmitter). Selection should be based on the exact package and the operating conditions required by the design, rather than on a nearby family member or a generic part number.
Technical Specifications
| Parameter | Value |
|---|---|
| Package | LQFP-128(14×14) |
| Supply voltage | 3.3V~5.3V |
| Data Rate | 4Mbps |
| Number of Channels | 8 |
| Operating Temperature | -40℃~+85℃;-40℃~+65℃ |
| Features | Supports MODEM signals;Supports hardware flow control signals CTS & RTS auto-handshake and auto-baud rate control;Supports serial port frame error detection;Supports Break line interval detection;Built-in clock oscillator;Supports serial port low-power sleep mode |
| Current – Supply | 10mA |
Exact-Part Selection Insight
The exact transceiver/interface part is rated for 4Mbps data rate from 3.3V~5.3V supplies. Bus termination, common-mode range, node count and logic-side voltage must match the target network; a protocol-family label by itself is not enough to establish substitution compatibility.
Selection Notes
- Package: LQFP-128(14×14)
- Supply voltage: 3.3V~5.3V
- Data Rate: 4Mbps
- Number of Channels: 8
- Operating Temperature: -40℃~+85℃;-40℃~+65℃
Application Fit
This exact part is appropriate for designs that require a UART interface controller with the confirmed package and electrical/function parameters above. Final fit depends on the surrounding circuit, interface, thermal and mechanical requirements of the target design.
Design Considerations
Confirm the available supply rail stays inside the stated operating range, including startup and transient conditions.
Verify interface voltage levels, bus topology and timing/data-rate requirements against the rest of the system.
Use the exact LQFP-128(14×14) footprint/package definition when checking PCB land pattern, assembly clearance and sourcing equivalence.
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
Request a Quote
To request a quotation, provide the manufacturer part number, required quantity, destination, target Date Code if applicable, and any testing or inspection requirements.