PIC18LF2458-I/SO
PIC18LF2458-I/SO - 24KB Flash USB MCU 8-bit 48MHz
The Microchip Technology PIC18LF2458-I/SO is an 8-bit PIC microcontroller from the PIC18F2458/2553/4458/4553 family, supplied in a 28-pin SOIC (SO) package with industrial -40C to +85C temperature range. The LF prefix denotes a low-voltage variant operating from 2.0V to 5.5V (versus the standard F variant at 4.2V-5.5V), making the LF2458 suited to battery-powered and USB bus-powered designs. It integrates 24KB of Flash program memory, 2KB of SRAM, and 256 bytes of EEPROM, with a 12-bit A/D converter and a full-speed USB 2.0 peripheral (12 Mbit/s).
A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, plus peripherals such as timers, communication interfaces, and analog converters. Within the broader taxonomy, the PIC18LF2458 is an 8-bit CISC Harvard-architecture MCU in the PIC18 family of microcontrollers, which itself sits inside Microchip's 8-bit PIC microcontroller portfolio and the wider semiconductor MCU category. It executes most instructions in one instruction cycle, providing 48 MHz / 4 = 12 MIPS performance at maximum clock, and provides three serial ports (FS-USB, I2C, and SPI up to 10 Mbit/s).
Key differentiating features of the PIC18LF2458 include: nanoWatt technology for power-managed sleep modes, a 12-bit A/D converter (versus the 10-bit A/D found on many earlier PIC18F2x/4x parts), 24 digital I/O pins across 28 pins, an internal 31 kHz to 8 MHz oscillator with PLL for 48 MHz operation, and a full-speed USB transceiver on-chip. The combination of integrated USB 2.0, ample memory, and 12-bit ADC in a small SOIC-28 footprint differentiates the LF2458 from simpler 8-bit MCUs that require an external transceiver or ADC.
Technically, the LF2458 uses a 16-bit instruction word Flash architecture with separate program and data buses (Harvard), enabling simultaneous access to instruction and data memory. The CPU features an 8 x 8 hardware multiplier and a barrel shifter, supporting single-cycle multiply operations. Power management offers several low-power modes (Idle, Sleep, and PRI_RUN variants of nanoWatt), with the LF variant extending the operating voltage window down to 2.0V for direct Li-ion coin-cell compatibility.
Typical applications include low-speed USB peripherals (HID, CDC, custom HID-class devices), 12-bit sensor data-acquisition front ends, low-power industrial controllers, and battery-powered instruments that need USB connectivity only when tethered to a host. In each, the on-chip USB transceiver eliminates the external transceiver and 5V regulator typically required by discrete designs. In a battery-powered design, the low-voltage LF range enables direct operation from two alkaline or NiMH cells; in a USB CDC bridge, the LF2458 appears as a virtual COM port without external crystals beyond the standard 20 MHz resonator with PLL.
When designing with the PIC18LF2458, pay attention to the ICD/ICSP header pinout to ensure MCLR, PGC, and PGD are brought out for in-circuit programming. Use a 20 MHz or 24 MHz crystal/resonator with the PLL enabled to derive the 48 MHz system clock required by the USB module. Decouple VDD/VSS with 100 nF + 1 uF near each pair, and keep the D+/D- traces matched and short per the USB 2.0 spec. For lowest sleep current, disable unused peripherals before entering Sleep.
This page synthesizes distributor pricing, SOIC-28 pinout details, and same-family drop-in alternatives drawn from the Microchip pin and code compatibility chart, providing information not assembled in the manufacturer datasheet alone.
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