PIC18LF4458T-I/PT - 48MHz 8-bit USB MCU, 24KB Flash | Microchip
MPN: PIC18LF4458T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.3 | $6.30 |
| 10 | $5.78 | $57.80 |
| 100 | $5.21 | $521.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $4.1 | $4,100.00 |
PIC18LF4458T-I/PT Overview
An 8-bit microcontroller (MCU) is a programmable processor that executes instructions from internal program memory and interfaces with peripheral devices through digital and analog I/O. The PIC18 family is Microchip's high-performance 8-bit architecture, sitting under the broader taxonomy of microcontrollers -> embedded processors -> semiconductors. Within the PIC18 family, the 'F4458 variant integrates a full-speed USB 2.0 (low-speed/full-speed) transceiver, enabling direct USB device connectivity without an external PHY.
Key features of the PIC18LF4458T-I/PT include 256 bytes of EEPROM data memory, a 10-bit Analog-to-Digital Converter (ADC) with up to 13 input channels, multiple Enhanced Capture/Compare/PWM (ECCP) modules, a Master Synchronous Serial Port (MSSP) supporting SPI and I2C, two Enhanced USART modules, an on-chip USB 2.0 full-speed transceiver, and a 10 MIPS instruction throughput at 48 MHz. The 'LF' prefix denotes the low-voltage 'F' core that runs from 2.0 V to 5.5 V, supporting both 3.3 V and 5 V rails.
The 44-pin TQFP package offers a compact surface-mount footprint suitable for space-constrained designs, while the wide operating temperature range of -40 °C to +85 °C (industrial, I-grade) enables use in industrial, automotive (non-safety) and consumer applications. The part number suffix /PT identifies the TQFP package variant, and the 'T' before the temperature grade indicates tape-and-reel packaging.
Typical applications include USB Human Interface Devices (HID) such as keyboards, mice and game controllers, USB-to-UART bridges, low-cost data loggers, industrial sensor interfaces, and educational/development boards. The integrated USB transceiver eliminates external PHY components, reducing BOM cost in USB peripherals.
When designing with this device, ensure the 48 MHz clock source (either internal oscillator with PLL or external crystal) is stable before USB enumeration begins. Decouple VDD/VSS with at least 100 nF ceramic capacitors placed close to the pins, and follow Microchip application note AN956 for USB hardware design guidelines.
This page synthesizes distributor pricing as of 2026-09-28, drop-in pin-compatible alternatives, comparison data, and practical design notes that are not collated in the manufacturer datasheet alone, giving engineers and buyers a single reference for sourcing and second-sourcing the PIC18LF4458T-I/PT.
Drop-in alternatives for PIC18LF4458T-I/PT — 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 PIC18LF4458T-I/PT (same form factor and footprint) — differing in Operating Temperature, Timers, ADC, Package, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF4458-I/PT
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →PIC18LF4455T-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.03 / Unit
View Datasheet →PIC18LF4450T-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.55 / Unit
View Datasheet →PIC18F4550-I/PT
✅ Drop-In✓ In Stock
$4.95 / Unit
View Datasheet →PIC18F4553-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4431-I/PT
✅ Drop-In✓ In Stock
$4.79 / Unit
View Datasheet →PIC18LF4458T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit RISC) |
| Family | PIC18F4553 family (PIC18F/LF2458/4458/2553/4553) |
| CPU Speed | 48 MHz (10 MIPS) |
| Program Memory (FLASH) | 24 KB (12K x 16 words) |
| Data SRAM | 2 KB |
| Data EEPROM | 256 bytes |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| Operating Temperature | -40 °C to +85 °C (Industrial, I-grade) |
| Package | 44-pin TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| USB | USB 2.0 Full-Speed (12 Mbps) on-chip transceiver |
| ADC | 10-bit, up to 13 channels |
| Communication | 1x MSSP (SPI/I2C), 2x Enhanced USART |
| PWM | Enhanced CCP modules |
| RoHS Status | Compliant |
| Lead-Free / Halogen-Free | Lead-free finish (per Microchip datasheet) |
PIC18LF4458T-I/PT Pin Configuration
| Pin 1 | VSS — Ground reference |
| Pin 2 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2/VREF- — Port A bit 2 / Analog input 2 / ADC VREF- |
| Pin 5 | RA3/AN3/VREF+ — Port A bit 3 / Analog input 3 / ADC VREF+ |
| Pin 6 | RA4/T0CKI/RCV — Port A bit 4 / Timer0 clock input / USB RCV |
| Pin 7 | RA5/AN4/SS/HLVDIN — Port A bit 5 / Analog input 4 / SPI SS / HLVD input |
| Pin 8 | RE0/RD/AN5 — Port E bit 0 / Read control / Analog input 5 |
| Pin 9 | RE1/WR/AN6 — Port E bit 1 / Write control / Analog input 6 |
| Pin 10 | RE2/CS/AN7 — Port E bit 2 / Chip select / Analog input 7 |
| Pin 11 | VDD — Positive supply (2.0 V to 5.5 V) |
| Pin 12 | VSS — Ground |
| Pin 13 | OSC1/CLKI/RA7 — Crystal oscillator input / External clock / Port A bit 7 |
| Pin 14 | OSC2/CLKO/RA6 — Crystal oscillator output / Clock output / Port A bit 6 |
| Pin 15 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 16 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 output |
| Pin 17 | RC2/CCP1 — Port C bit 2 / Enhanced CCP1 output |
| Pin 18 | VUSB — USB transceiver internal voltage regulator output (decouple with 220 nF) |
| Pin 19 | RC4/D-/VP_EN — Port C bit 4 / USB D- line / USB enable |
| Pin 20 | RC5/D+/VM_EN — Port C bit 5 / USB D+ line / monitor enable |
| Pin 21 | RC6/TX/CK — Port C bit 6 / USART TX / USART synchronous clock |
| Pin 22 | RC7/RX/DT — Port C bit 7 / USART RX / USART synchronous data |
| Pin 23 | RD0/SPP0 — Port D bit 0 / Streaming Parallel port bit 0 |
| Pin 24 | RD1/SPP1 — Port D bit 1 / Streaming Parallel port bit 1 |
| Pin 25 | RD2/SPP2 — Port D bit 2 / Streaming Parallel port bit 2 |
| Pin 26 | RD3/SPP3 — Port D bit 3 / Streaming Parallel port bit 3 |
| Pin 27 | RD4/SPP4 — Port D bit 4 / Streaming Parallel port bit 4 |
| Pin 28 | RD5/SPP5/P1B — Port D bit 5 / Streaming Parallel port bit 5 / PWM P1B |
| Pin 29 | RD6/SPP6/P1C — Port D bit 6 / Streaming Parallel port bit 6 / PWM P1C |
| Pin 30 | RD7/SPP7/P1D — Port D bit 7 / Streaming Parallel port bit 7 / PWM P1D |
| Pin 31 | VSS — Ground |
| Pin 32 | VDD — Positive supply |
| Pin 33 | RB0/AN12/INT0 — Port B bit 0 / Analog input 12 / External interrupt 0 |
| Pin 34 | RB1/AN10/INT1 — Port B bit 1 / Analog input 10 / External interrupt 1 |
| Pin 35 | RB2/AN8/INT2 — Port B bit 2 / Analog input 8 / External interrupt 2 |
| Pin 36 | RB3/AN9/CCP2 — Port B bit 3 / Analog input 9 / CCP2 output |
| Pin 37 | RB4/AN11/KBI0 — Port B bit 4 / Analog input 11 / KBI input 0 |
| Pin 38 | RB5/KBI1/PGM — Port B bit 5 / KBI input 1 / LVP programming |
| Pin 39 | RB6/KBI2/PGC — Port B bit 6 / KBI input 2 / ICSP clock |
| Pin 40 | RB7/KBI3/PGD — Port B bit 7 / KBI input 3 / ICSP data |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | VSS — Ground |
| Pin 44 | VDD — Positive supply |
Typical Applications
PIC18LF4458T-I/PT is suitable for 7 applications: USB HID Peripherals (Keyboard, Mouse, Gamepad), USB-to-UART Bridge / CDC Virtual COM Port, Industrial Sensor Interface with USB Logging, Consumer USB Charging / Power Bank Controller, Educational Development Board / Trainer Platform, Automotive Interior USB Accessory, Data Acquisition Front-End for Test Equipment.
USB HID Peripherals (Keyboard, Mouse, Gamepad)
The PIC18LF4458T-I/PT is purpose-built for USB Human Interface Devices thanks to its integrated USB 2.0 full-speed transceiver, 48 MHz CPU, and 24 KB of FLASH for HID class descriptors and HID report buffers. Its 10 MIPS instruction throughput handles HID polling at 1 kHz with ample headroom for matrix-scanning firmware and debounce algorithms. The wide 2.0 V to 5.5 V supply range allows operation from a single 3.3 V regulator or directly from USB bus power after a 3.3 V LDO. Compared with discrete USB MCU solutions that require an external PHY, the PIC18LF4458T-I/PT eliminates 6-8 external components and reduces BOM cost. Use the Microchip USB stack (MCHPFSUSB) with HID class driver; expected throughput easily exceeds the 800 byte/s HID full-speed limit.
Recommended
USB-to-UART Bridge / CDC Virtual COM Port
In USB-to-UART bridge applications, the PIC18LF4458T-I/PT leverages its on-chip USB transceiver plus one of the two Enhanced USART peripherals to provide a CDC-class virtual COM port, eliminating the need for an external FTDI bridge IC. The 2 KB SRAM is sufficient to buffer full-speed USB packets (64-byte max packet) plus UART FIFOs, while 24 KB FLASH hosts the CDC class driver and any custom protocol glue. The 48 MHz CPU decodes/encode UART at standard baud rates up to 921,600 bps without interrupt overload. Operation from 3.3 V directly drives modern 3.3 V logic-level UART peripherals. Compared with commercial USB-UART bridges, this implementation is firmware-customizable for proprietary escape sequences or boot protocols.
Recommended
Industrial Sensor Interface with USB Logging
The PIC18LF4458T-I/PT fits industrial sensor interface designs where 4-20 mA analog signals, RTD sensors or 0-10 V transducers must be digitized and streamed over USB to a host PC. Its 10-bit ADC with up to 13 input channels handles multi-sensor arrays directly, while the MSSP peripheral reads SPI or I2C digital sensors (temperature, pressure) concurrently. The 2 KB SRAM buffers burst ADC conversions at 100 ksamples/s aggregate rate, and 24 KB FLASH hosts calibration tables. The industrial -40 °C to +85 °C temperature grade supports factory-floor deployment. Compared with 12-bit ADC variants, the 10-bit resolution is acceptable for monitoring applications where ±0.1 % full-scale accuracy is not required.
Recommended
Consumer USB Charging / Power Bank Controller
In consumer USB charging and power-bank controller applications, the PIC18LF4458T-I/PT monitors battery voltage via its 10-bit ADC, controls load FETs via CCP PWM modules, and communicates status to the user via USB CDC or HID. The 48 MHz CPU enables precise PWM dimming of status LEDs and accurate coulomb counting, while 2 KB SRAM holds runtime state for cell balancing algorithms. The wide 2.0 V to 5.5 V supply range supports direct operation from a single Li-ion cell. Compared with simpler 8-pin MCUs, the PIC18LF4458T-I/PT provides USB connectivity without external bridge chips, reducing BOM by approximately $0.80 per unit.
Recommended
Educational Development Board / Trainer Platform
The PIC18LF4458T-I/PT serves as the main MCU in educational development boards and trainer platforms because it integrates USB, ADC, multiple serial peripherals, and ample FLASH in a single breadboard-friendly package (TQFP-44 with 0.8 mm pitch or via carrier PCB). The Microchip MPLAB X IDE plus XC8 compiler plus the free MCHPFSUSB stack provides a zero-cost toolchain for students. Industrial temperature grade tolerates classroom lab environments. Compared with ARM Cortex-M0+ boards, the PIC18 architecture has a simpler interrupt model and instruction set, making it easier for beginners to learn embedded C and assembly fundamentals without architectural complexity.
Recommended
Automotive Interior USB Accessory
In non-safety automotive interior applications such as USB audio interfaces, cabin lighting controllers with USB diagnostics, or seat-control modules with USB service ports, the PIC18LF4458T-I/PT provides the USB connectivity, ADC channels, and PWM outputs needed for these subsystems. The -40 °C to +85 °C industrial temperature grade handles cabin-temperature extremes, though for under-hood or safety-critical applications an AEC-Q100-qualified part should be selected instead. Compared with automotive-specific MCUs, the PIC18LF4458T-I/PT offers lower cost and faster prototype turnaround while still meeting interior-environment thermal requirements.
Recommended
Data Acquisition Front-End for Test Equipment
In test and measurement equipment, the PIC18LF4458T-I/PT serves as a USB-tethered data acquisition front-end for low-bandwidth oscilloscope probes, logic analyzers, or sensor simulators. Its 10-bit ADC sampling at 100 ksps with 13 input channels, MSSP for SPI-controlled DAC or attenuator networks, and USB 2.0 full-speed streaming at 12 Mbps cover typical USB instrument class designs. The 2 KB SRAM is enough for a circular sample buffer; deep memory acquisition should use a PIC18 variant with more RAM. Compared with USB-based DAQ ASICs, this MCU-based design is firmware-upgradable and can adapt to new sensor protocols without hardware spin.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF4458T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF4458-I/PT | PIC18LF4455T-I/PT | PIC18LF4450T-I/PT | PIC18F4550-I/PT | PIC18F4553-I/PT | PIC18F4431-I/PT |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (10x10) | 44-TQFP (10x10) - same | 44-TQFP (10x10) - same | 44-TQFP (10x10) - same | 44-TQFP (10x10) - same | 44-TQFP (10x10) - same | 44-TQFP (10x10) - same |
| CPU Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 40 MHz | 40 MHz |
| FLASH Memory | 24 KB | 24 KB | 24 KB | 32 KB | 32 KB | 32 KB | 16 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 1 KB |
| USB Peripheral | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | No USB |
| Operating Voltage | 2.0 V to 5.5 V | 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 | 4.2 V to 5.5 V | 4.2 V to 5.5 V |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| ADC | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 9 channels |
Key Differentiators
- Low-voltage LF core for 3.3V and battery-powered designs (vs PIC18F4550-I/PT)
- Compact 44-pin TQFP with all PIC18F4553-family peripherals (vs PIC18F458-I/PT (32KB FLASH, 40-pin TQFP))
- 48 MHz / 10 MIPS instruction throughput (vs PIC18F4553-I/PT)
Design Notes
Decouple VDD/VSS with a 100 nF ceramic capacitor placed within 5 mm of each power pin pair. The PIC18LF4458T-I/PT has multiple VDD pins (11, 32, 44) and VSS pins (1, 12, 31, 43) that must each be decoupled - do not share a single capacitor across multiple pins. The VUSB pin (18) requires an additional 220 nF decoupling capacitor per the datasheet USB section to stabilize the internal USB 3.3V regulator. Bulk 10 µF tantalum or aluminum-polymer capacitors on the main supply rail help with USB inrush currents during hot-plug events.
Route the USB D+ (RC5) and D- (RC4) differential pair as a 90 ohm differential impedance-matched trace with length matching within 2 mm. Keep the traces short (under 50 mm total) and away from switching noise sources such as PWM outputs or oscillator traces. The D+/D- pins require 27 ohm series resistors in some configurations; refer to Microchip application note AN956 for the recommended USB hardware design including ESD protection using a USBLC6-2SC6 array. Place the 48 MHz crystal (or resonator) close to OSC1/OSC2 (pins 13, 14) with guard ground around it.
Three common pitfalls when migrating firmware between PIC18LF4458 and PIC18F4550/PIC18F4553 family members: (1) Operating voltage differs - LF parts run 2.0-5.5 V, while F parts require 4.2-5.5 V minimum; connecting a 3.3 V LF to a 5 V F design causes brown-out resets. (2) CPU clock differs - 48 MHz LF vs 40 MHz F; if your code uses CPU-cycle-precise delays, recalculate for 10 MIPS vs 8.33 MIPS. (3) Configuration bits for the oscillator, watchdog and brown-out voltage differ between LF and F variants - always reconfigure the CONFIG1H-2L registers when porting firmware between LF and F silicon.
Estimated: The PIC18LF4458T-I/PT in the 44-pin TQFP package has a typical thermal resistance (theta_JA) of approximately 50 °C/W on a 4-layer JEDEC test PCB. At full 48 MHz CPU speed with all peripherals active, core current draw is approximately 20 mA at 5 V (100 mW). Worst-case ambient temperature rise above 25 °C is therefore approximately 5 °C in typical conditions. For continuous USB enumeration at high ambient temperatures, ensure the board layout includes a small copper pour under the exposed thermal pad area if available, and that the device does not share heat-generating components nearby.
Compliance Information
RoHS and REACH compliant per Microchip product page. Lead-free matte-tin finish. Halogen-free mold compound per Microchip material declaration. Not AEC-Q100 qualified - for under-hood or safety-critical automotive, select an AEC-Q100 variant or use an external automotive MCU.