PIC18LF2455T-I/SO - 48MHz 24KB Flash USB MCU 28-SOIC | Microchip
MPN: PIC18LF2455T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.22 | $6.22 |
| 10 | $5.84 | $58.40 |
| 100 | $5.21 | $521.00 |
| 500 | $4.62 | $2,310.00 |
| 1,000 | $4.05 | $4,050.00 |
PIC18LF2455T-I/SO Overview
A PIC18 microcontroller is an 8-bit Harvard-architecture MCU from Microchip's PIC family that combines a rich peripheral set (USB, I2C, SPI, USART, ADC, PWM) with very low power nanoWatt technology. The PIC18 LF series (Low-Voltage/Frequency) operates across 2.0V to 5.5V and supports full-speed operation up to 48 MHz internal clock (12 MIPS throughput), making it a workhorse for cost-sensitive embedded designs that need USB connectivity.
Key features of the PIC18LF2455T-I/SO include a 48 MHz maximum operating frequency, 24KB (12K x 16) flash program memory, 256 bytes of EEPROM data memory, 2 KB of SRAM, a 10-bit ADC with up to 13 channels, two 8-bit and three 16-bit timers, a Full-Speed USB 2.0 (12 Mbit/s) transceiver, MSSP (SPI / I2C), EUSART (LIN-capable), nanoWatt power management with multiple idle/sleep modes, and an industrial -40C to +85C operating range.
The device uses a modified Harvard architecture with separate program and data buses, a hardware multiplier (8x8 in one cycle), and Microchip's nanoWatt Technology dynamic power switching. The integrated SIE (Serial Interface Engine) handles USB protocol framing and CRC in hardware, allowing the CPU to focus on application code rather than USB stack overhead.
Typical applications include USB HID peripherals (keyboards, mice, custom input devices), USB-to-UART bridge dongles, low-cost data loggers with USB mass storage, sensor interface boards with USB diagnostic ports, industrial control nodes requiring firmware updates over USB, and educational/development boards for embedded USB learning.
When designing with this part, ensure that the USB D+/D- traces are routed as a 90 ohm differential pair, that VDDA/VUSB decoupling uses both bulk and high-frequency ceramics, and that the VUSB pin is properly bypassed with a 0.47uF capacitor per the datasheet.
This page synthesizes XAIPART distributor pricing, validated drop-in alternatives from Microchip's PIC18 family, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for PIC18LF2455T-I/SO — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC18LF2455T-I/SO (same form factor and footprint) — differing in Core Architecture, Package, I/O Pins, Program Memory (Flash), ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF2455-I/SO
✅ Drop-In✓ In Stock
$2.05 / Unit
View Datasheet →PIC18LF2550T-I/SO
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →PIC18F2455T-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF2450T-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF2550-I/SO
✅ Drop-In✓ In Stock
$3.85 / Unit
View Datasheet →PIC18LF2455T-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit Harvard RISC) |
| Program Memory (Flash) | 24 KB (12K x 16) |
| Data SRAM | 2 KB (2048 bytes) |
| Data EEPROM | 256 bytes |
| Maximum CPU Frequency | 48 MHz |
| Performance (MIPS) | 12 MIPS |
| Operating Voltage Range | 2.0 V to 5.5 V |
| Supply Voltage (LF) | 2.5 V / 3.3 V / 5 V |
| Package | 28-SOIC (7.50 mm / 0.295 in width) |
| Mounting Type | Surface Mount (Tape & Reel) |
| Operating Temperature | -40C to +85C (Industrial, 'I') |
| I/O Pins | 23 (approximate, 28-pin package) |
| ADC | 10-bit, up to 13 channels |
| Timers | 2 x 8-bit, 3 x 16-bit |
| USB | USB 2.0 Full-Speed (12 Mbit/s), integrated SIE |
| Serial Interfaces | MSSP (SPI / I2C), EUSART (LIN-capable) |
| Power-Saving Modes | nanoWatt Technology (multiple idle/sleep modes) |
| RoHS Status | Compliant |
| MSL Level | 1 (per SOIC handling) |
PIC18LF2455T-I/SO Pin Configuration
| Pin 1 | MCLR/VPP/RE3 — Master Clear (reset) / Programming voltage / PORTE bit 3 |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / ADC VREF- |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| Pin 6 | RA4/T0CKI/C1OUT — PORTA bit 4 / Timer0 clock / Comparator 1 output |
| Pin 7 | RA5/AN4/SS/HLVDIN/C2OUT — PORTA bit 5 / Analog input 4 / SPI SS / HLVD input / Comparator 2 output |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKI/RA7 — Crystal oscillator input / External clock input / PORTA bit 7 |
| Pin 10 | OSC2/CLKO/RA6 — Crystal oscillator output / Clock output / PORTA bit 6 |
| Pin 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 12 | RC1/T1OSI/CCP2/UOE — PORTC bit 1 / Timer1 oscillator input / CCP2 / USB OE |
| Pin 13 | RC2/CCP1/P1A — PORTC bit 2 / CCP1 / PWM 1A output |
| Pin 14 | VUSB — Internal USB 3.3V regulator output (bypass with 0.47 uF to VSS) |
| Pin 15 | RC4/D-/VMO — PORTC bit 4 / USB D- / USB transceiver VMO |
| Pin 16 | RC5/D+/VPO — PORTC bit 5 / USB D+ / USB transceiver VPO |
| Pin 17 | RC6/TX/CK — PORTC bit 6 / EUSART TX / EUSART synchronous clock |
| Pin 18 | RC7/RX/DT — PORTC bit 7 / EUSART RX / EUSART synchronous data |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply (2.0 V to 5.5 V) |
| Pin 21 | RB0/AN12/INT0/FLT0 — PORTB bit 0 / Analog input 12 / External interrupt 0 / PWM fault input |
| Pin 22 | RB1/AN10/INT1 — PORTB bit 1 / Analog input 10 / External interrupt 1 |
| Pin 23 | RB2/AN8/INT2/VMO — PORTB bit 2 / Analog input 8 / External interrupt 2 |
| Pin 24 | RB3/AN9/CCP2 — PORTB bit 3 / Analog input 9 / CCP2 |
| Pin 25 | RB4/AN11/KBI0 — PORTB bit 4 / Analog input 11 / Keyboard interrupt 0 |
| Pin 26 | RB5/KBI1/PGM — PORTB bit 5 / Keyboard interrupt 1 / LVP programming |
| Pin 27 | RB6/KBI2/PGC — PORTB bit 6 / Keyboard interrupt 2 / ICSP clock |
| Pin 28 | RB7/KBI3/PGD — PORTB bit 7 / Keyboard interrupt 3 / ICSP data |
Typical Applications
PIC18LF2455T-I/SO is suitable for 6 applications: USB HID Input Devices, USB-to-UART Bridge Dongles, USB Data Loggers, Industrial Sensor Interface Boards, Firmware-Update USB Bootloaders, Educational USB Development Boards.
USB HID Input Devices
The PIC18LF2455T-I/SO is well matched to USB Human Interface Device designs (keyboards, mice, custom joysticks, programmable macro pads) because the integrated Full-Speed USB 2.0 transceiver and on-chip SIE handle the 12 Mbit/s protocol framing without an external PHY. The 24 KB flash comfortably fits HID report descriptors, debounce logic, scan matrices and bootloaders, while the 2 KB SRAM holds HID ring buffers and keycode FIFOs. The 2.0 V to 5.5 V supply range lets the same PCB run on 3.3 V lithium coin cells or USB bus-powered 5 V rails. The 28-SOIC footprint simplifies hand-soldered prototypes while staying compatible with automated reflow lines. For interrupt latency, the three 16-bit timers and 23 I/O pins give designers enough capture/compare resources for matrix scans without offloading to the USB SIE.
Recommended
USB-to-UART Bridge Dongles
For USB-to-UART bridge dongles (often used as Arduino replacements or serial debug cables), the PIC18LF2455T-I/SO offers CDC class firmware that enumerates as a virtual COM port alongside the integrated EUSART for the asynchronous serial side. The 48 MHz CPU and 12 MIPS throughput give more than enough headroom for 921,600 baud throughput and software flow control. The 28-SOIC footprint is small enough to fit inline with a USB Type-A or USB Mini-B connector, while the -40C to +85C industrial range supports outdoor enclosure use. The nanoWatt sleep modes keep dongle idle current under 100 uA when the host disables the COM port, which is critical for bus-powered designs. LIN-capable EUSART also opens automotive K-Line / LIN bridge applications.
Recommended
USB Data Loggers
USB data loggers for temperature, vibration, voltage and current measurements benefit from the PIC18LF2455T-I/SO's 10-bit ADC with up to 13 channels, integrated EEPROM for parameter storage, and full-speed USB for direct drag-and-drop mass-storage enumeration. The 2 KB SRAM buffers sample bursts, and the 256-byte EEPROM stores calibration constants and timestamps across power cycles. With the LF voltage range, two AA cells (3.0 V) or a single 3.3 V coin cell can power the logger in the field, and the nanoWatt idle modes drop quiescent current to microamps between samples. The 28-SOIC package remains affordable for low-volume industrial SKUs while still being lead-free and RoHS compliant.
Recommended
Industrial Sensor Interface Boards
Industrial sensor interface boards often need USB diagnostic ports for field calibration while running on 24V industrial rails. The PIC18LF2455T-I/SO fits this role when paired with a small buck regulator that produces 3.3 V from 24 V, since the part operates across 2.0 V to 5.5 V and tolerates industrial -40C to +85C ambient temperatures. The integrated USB port gives technicians a plug-and-play maintenance interface, while the MSSP (SPI / I2C) and EUSART peripherals handle Modbus RTU, RS-485, and SPI sensor front-ends. The 24 KB flash fits RTOS-light command interpreters and Modbus stacks, while 2 KB SRAM is sufficient for protocol buffers. The 28-SOIC package simplifies conformal-coat rework in the field.
Recommended
Firmware-Update USB Bootloaders
Adding a USB bootloader to an existing 5 V product is straightforward with the PIC18LF2455T-I/SO because the on-chip SIE handles the USB protocol while the CPU runs the bootloader code. The 24 KB flash reserves space for the application, while the LF supply rail (2.0 V to 5.5 V) supports both 3.3 V and 5 V targets. Hardware handshake lines on RC4/RC5 (D+/D-) free up other I/O for application use, and the 256-byte EEPROM stores bootloader flags and versioning. Designers can implement HID-based bootloaders without installing drivers, which simplifies end-user updates on Windows, macOS and Linux hosts.
Recommended
Educational USB Development Boards
Educational and hobbyist USB development boards (such as PIC-based trainer kits and open-source USB learning platforms) use the PIC18LF2455T-I/SO because it integrates the USB transceiver on-die, removing the BOM cost of external PHYs and crystal references. The 28-SOIC footprint is breadboard-friendly with a SOIC-to-DIP adapter, and the 2.0 V to 5.5 V supply lets students power the board from a 3.3 V LDO or USB bus. The 24 KB flash accommodates the USB stack, CDC/HID libraries and Microchip's MLA examples, while the 10-bit ADC, MSSP, EUSART and three timers give learners real peripheral experience. Industrial temperature grading also makes it suitable for university lab hardware that is reused across multiple cohorts.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF2455T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF2455-I/SO | PIC18LF2550T-I/SO | PIC18F2455T-I/SO | PIC18LF2450T-I/SO | PIC18LF2550-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (7.50 mm) | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same |
| Core Architecture | PIC18 (8-bit, 12 MIPS) | PIC18 (8-bit, 12 MIPS) | PIC18 (8-bit, 12 MIPS) | PIC18 (8-bit, 12 MIPS) | PIC18 (8-bit, 12 MIPS) | PIC18 (8-bit, 12 MIPS) |
| Flash | 24 KB | 24 KB | 32 KB | 24 KB | 16 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| USB | USB 2.0 FS, integrated | USB 2.0 FS, integrated | USB 2.0 FS, integrated | USB 2.0 FS, integrated | USB 2.0 FS, integrated | USB 2.0 FS, integrated |
| Temperature Range | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) |
Key Differentiators
- Pin-compatible upgrade path to 32 KB flash with no PCB change (vs PIC18LF2550T-I/SO)
- Wide 2.0 V to 5.5 V supply range supports battery-powered USB designs (vs PIC18F2455T-I/SO)
- Tube-packaged drop-in alternative available without sourcing changes (vs PIC18LF2455-I/SO)
- Cost-down 16 KB flash variant for simpler USB firmware (vs PIC18LF2450T-I/SO)
Design Notes
Route the USB D+ (RC5) and D- (RC4) pair as a 90 ohm differential trace with controlled impedance, keeping the pair length-matched to within 2 mm. Place the VUSB pin bypass capacitor (0.47 uF X7R) within 3 mm of the pin to stabilize the internal 3.3V USB regulator. The VDD rail should use a 100 nF decoupling cap close to the MCU plus a bulk cap of 4.7 uF or 10 uF. Avoid routing noisy switching signals across the differential pair, and provide a clean analog ground island for the USB shield and ESD protection diode returns. Estimated: with a 4-layer stack-up, 0.2 mm dielectric, and 1 oz copper, a 0.20 mm / 0.40 mm D+/D- geometry typically hits 90 ohm +/-10% differential impedance.
Decide early whether to power the part from USB VBUS (5 V) or a local regulator (3.3 V). For USB bus-powered designs, the LF rail accepts the 5 V VBUS directly, while the internal USB 3.3 V regulator on VUSB supplies the USB transceiver. For self-powered designs, tie VBUS to the local 3.3 V through a 10 kOhm resistor and let VUSB provide the internal transceiver rail. nanoWatt sleep modes drop quiescent current to under 1 uA, but USB bus-powered designs must still meet the USB 2.0 suspend current spec (500 uA maximum) when the host commands suspend. Estimated: VUSB-pin current at 12 Mbps traffic is roughly 5-10 mA depending on bus utilization.
Do not skip the 0.47 uF VUSB bypass capacitor, even in prototypes - without it the USB transceiver can fail USB-IF compliance testing or enumerate intermittently. Do not confuse the LF and F variants: PIC18F2455T-I/SO requires VDD >= 4.2 V and will not start up at 3.3 V, while PIC18LF2455T-I/SO runs across 2.0 V to 5.5 V. Ensure MCLR is pulled high through a 10 kOhm resistor and do not leave it floating, or the part will randomly reset in noisy environments. The ICSP pins (RB6/PGC, RB7/PGD) must be usable for in-circuit programming - do not load them with >5 kOhm or heavy capacitance. The CCP pins double as PWM outputs; remap PWM carefully if using CCP1/CCP2 for general timing.
Keep the 28-SOIC thermal pad (or lead frame) tied to a continuous ground pour on the top and bottom layers to provide thermal mass and a low-impedance return for switching I/O. Place the crystal or external clock source within 5 mm of OSC1/OSC2, and guard the traces with a ground ring to attenuate radiated noise into the USB pair. If using the internal oscillator, the LF parts ship factory-calibrated to +/-2% across 2.0 V to 5.5 V and 0C to +85C, but USB Full-Speed traffic still benefits from a low-jitter external 16MHz crystal referenced by the PLL. Estimated: with a 1.0 mm SOIC pad pitch, keep the SOIC leads fully wetted with 0.1 mm / 0.2 mm land patterns to avoid solder-bridging during reflow.
Compliance Information
RoHS-compliant per Microchip product page and LCSC listing. Not AEC-Q100 qualified - select automotive-grade PIC18 family variants when required. Halogen-free / Pb-free per Microchip green-compliance statements.
