: Combines a 8051-based microcontroller core with system-level functions like LPC bus interface , keyboard scan matrix , and PS/2 support .

The KBC1126NU is a reliable, robust EC when operated within its limits. If you searched for its datasheet because yours runs “hot,” first check the power supply and external components. For the full electrical and timing specs, go directly through Microchip’s legacy support – and avoid shady datasheet websites.

You can find more detailed inventory and technical data on distributor sites like Veswin or Mouser for the closely related KBC1122 series. CAP1126 Data Sheet - Mouser Electronics

Handles power sequencing and sleep/wake states for laptops.

If you have landed on this page, you are likely searching for the —and you are not alone. Over the past 18 months, search volume for this specific microcontroller has spiked. Why? The SMSC (now Microchip) KBC1126NU is the embedded Keyboard and Embedded Controller (KBC) found in millions of legacy and mid-range laptops, particularly from Dell, HP, and Acer manufactured between 2010 and 2016.

If you touched the chip and found it uncomfortably hot, this is a specific symptom. Since the KBC is connected directly to the main power rail (3V/5V coil or 3.3V Standby), overheating usually indicates a short circuit.

However, the term "hot" in the context of this datasheet usually refers to two specific states: