In the 28-LCC (J-Lead) package, you can get the product at a low cost.In terms of packaging, Tube is used.In the present state, this electronic part is Obsolete.Surface Mount is a way to mount it.
ST16C1551IJ28-F Features
ST16C1551IJ28-F Applications
There are a lot of MaxLinear, Inc. ST16C1551IJ28-F UARTs applications.