STK551-391A1-E

STK551-391A1-E appears to be an STMicroelectronics STK-series part code (likely an evaluation module or reference board). There is no readily available public datasheet for this exact code, so the precise device, specs, and pinout aren’t verifiable here.
In general, STK-prefix parts denote development kits/modules that expose the MCU/driver core and peripherals to aid evaluation and prototyping. Typical content may include:
- A microcontroller or ASIC core
- Power regulation and clocking
- I/O interfaces (GPIO, ADC/DAC, SPI/I2C/UART)
- Debug/programming headers
- On-board peripherals or example peripherals
Common uses: early-stage design, firmware development, and system validation.
To introduce this part reliably, please share the exact family (MCU/driver), revision, or a datasheet/distributor link. I can then provide a concise summary of its key specs, features, and example applications.

Manufacturer: Sanyo Electric Co., Ltd. (a Japanese multinational electronics company; historically a major producer of consumer electronics and electronic components; now part of Panasonic).

I don’t have data for STK551-391A1-E. Please share the datasheet or the device type. With only the part number, I can’t confirm its function or exact applications. If it’s an STK analog/digital IC, typical areas could include: automotive electronics (sensor interfaces, power management, motor control), consumer electronics (DC-DC converters, audio amplifiers, display drivers), industrial control (PWM/controllers, motor drives), and LED lighting drivers. Once you provide the datasheet, I’ll extract the precise application areas.