PIC18LF4458-I/PT - 8-Bit 48MHz USB MCU, 24KB Flash | Microchip
MPN: PIC18LF4458-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.45 | $6.45 |
| 10 | $5.8 | $58.00 |
| 100 | $5.2 | $520.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $4.1 | $4,100.00 |
PIC18LF4458-I/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), volatile data memory (RAM), and a rich set of digital and analog peripherals (timers, ADC, communication ports, USB, etc.) on a single silicon die. The PIC18F family sits in Microchip's 8-bit PIC taxonomy above the baseline PIC10/12/16 families, offering higher performance (up to 12 MIPS at 48 MHz), larger memory and the Enhanced Flash architecture with self-programmability. The PIC18LF4458 is the low-voltage 'LF' variant, optimized for operation down to 2.0 V, which makes it suitable for battery-powered or regulated 3.3 V designs.
Key specifications include a 2.0 V to 5.5 V supply range, 34 digital I/O lines, integrated USB 2.0 Full-Speed transceiver, 10-bit ADC, multiple timers, I2C, SPI, USART, and nanoWatt power-management modes that drop current consumption to microampere levels during idle and sleep states. The 'I' suffix denotes an industrial temperature range of -40C to +85C.
The device uses Microchip's Enhanced Harvard RISC architecture with a 16-bit instruction word and 8-bit data path. The 12 MIPS (million instructions per second) throughput at 48 MHz is sufficient for real-time USB class firmware (CDC, HID, MSD), sensor processing, and human-interface control loops. The on-chip 24 KB Enhanced Flash supports self-programming under firmware control, enabling bootloader-based field updates.
Typical applications include USB peripherals (HID keyboards, mice, gamepads, CDC serial adapters), industrial data-acquisition front-ends, home-automation controllers, smart sensors with USB diagnostics ports, and low-cost consumer electronics that need USB connectivity without a dedicated PHY IC. Designers value the LF variant when system rails are already 3.3 V and the USB bus is self- or bus-powered.
When laying out the 44-pin TQFP, place the decoupling capacitors (100 nF plus 4.7 uF bulk) as close as possible to VDD/VSS pairs, route the D+/D- USB pair with 90 ohm differential impedance, and ensure the exposed pad (if present) is soldered to the ground plane for thermal and electrical performance. Always include a 0.1 uF cap on VUSB when the internal USB regulator is used.
This page synthesizes distributor pricing, drop-in compatible alternatives, application notes and design considerations that go beyond what is printed on the Microchip datasheet, helping engineers select the right MCU quickly and avoid common layout pitfalls.
Drop-in alternatives for PIC18LF4458-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 PIC18LF4458-I/PT (same form factor and footprint) — differing in ADC, Core Architecture, Timers, Package, Maximum CPU Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF4455-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18LF4550-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4458-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.79 / Unit
View Datasheet →PIC18LF4555-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18LF4455T-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.03 / Unit
View Datasheet →PIC18LF4458-I/PT Maximum Ratings & Electrical Characteristics
| Product Family | PIC18F |
| Core Architecture | 8-bit PIC (Enhanced Harvard RISC) |
| CPU Clock Speed | 48 MHz (12 MIPS) |
| Program Memory Type | Enhanced Flash (self-programmable) |
| Program Memory Size | 24 KB (12K x 16 words) |
| Data RAM | 2 KB |
| Data EEPROM | 256 bytes (typical for this family) |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| Digital I/O Pins | 34 |
| USB Peripheral | USB 2.0 Full-Speed (12 Mbps), internal transceiver |
| ADC | 10-bit, multi-channel (typical for PIC18F445x/455x family) |
| Communication Interfaces | I2C, SPI, USART (Enhanced), USB |
| Timers | Multiple 8-bit and 16-bit timers (typical for family) |
| Power-Saving Modes | nanoWatt Technology (Idle, Sleep, Deep Sleep) |
| Operating Temperature Range | -40C to +85C (Industrial, 'I' suffix) |
| Package | 44-pin TQFP (PT), 10x10 mm |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (lead-free TQFP) |
PIC18LF4458-I/PT Pin Configuration
| Pin 1 | MCLR/VPP/RE3 — Master Clear (reset) input / programming voltage / digital I/O RE3 |
| Pin 2 | RA0/AN0 — Digital I/O RA0 / analog input AN0 |
| Pin 3 | RA1/AN1 — Digital I/O RA1 / analog input AN1 |
| Pin 4 | RA2/AN2/VREF- — Digital I/O RA2 / analog input AN2 / ADC negative reference |
| Pin 5 | RA3/AN3/VREF+ — Digital I/O RA3 / analog input AN3 / ADC positive reference |
| Pin 6 | RA4/T0CKI/C1OUT — Digital I/O RA4 / Timer0 clock input / comparator 1 output |
| Pin 7 | RA5/AN4/SS/HLVDIN/C2OUT — Digital I/O RA5 / analog input AN4 / SPI slave select / HLVD input |
| Pin 8 | OSC2/CLKO/RA6 — Crystal output / clock output / digital I/O RA6 |
| Pin 9 | OSC1/CLKI/RA7 — Crystal input / clock input / digital I/O RA7 |
| Pin 10 | RC0/T1OSO/T1CKI — Digital I/O RC0 / Timer1 oscillator output / Timer1 clock input |
| Pin 11 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | RC1/T1OSI/CCP2 — Digital I/O RC1 / Timer1 oscillator input / CCP2 PWM output |
| Pin 14 | RC2/CCP1 — Digital I/O RC2 / CCP1 PWM output |
| Pin 15 | RC4/D-/VM — USB D- line / digital I/O RC4 / USB VBUS monitor input |
| Pin 16 | RC5/D+/VP — USB D+ line / digital I/O RC5 / USB VBUS power input |
| Pin 17 | VUSB — Internal USB 3.3 V regulator output (decouple with 0.1 uF + 4.7 uF) |
| Pin 18 | RD0/SPP0 — Digital I/O RD0 / Streaming Parallel Port data bit 0 |
| Pin 19 | RD1/SPP1 — Digital I/O RD1 / Streaming Parallel Port data bit 1 |
| Pin 20 | RD2/SPP2 — Digital I/O RD2 / Streaming Parallel Port data bit 2 |
| Pin 21 | RD3/SPP3 — Digital I/O RD3 / Streaming Parallel Port data bit 3 |
| Pin 22 | RC6/TX/CK — Digital I/O RC6 / USART TX / USART clock |
| Pin 23 | RC7/RX/DT — Digital I/O RC7 / USART RX / USART data |
| Pin 24 | RD4/SPP4 — Digital I/O RD4 / Streaming Parallel Port data bit 4 |
| Pin 25 | RD5/SPP5 — Digital I/O RD5 / Streaming Parallel Port data bit 5 |
| Pin 26 | RD6/SPP6 — Digital I/O RD6 / Streaming Parallel Port data bit 6 |
| Pin 27 | RD7/SPP7 — Digital I/O RD7 / Streaming Parallel Port data bit 7 |
| Pin 28 | VSS — Ground reference |
| Pin 29 | RB0/AN12/INT0/FLT0 — Digital I/O RB0 / analog input AN12 / external interrupt 0 / PWM fault input |
| Pin 30 | RB1/AN10/INT1 — Digital I/O RB1 / analog input AN10 / external interrupt 1 |
| Pin 31 | RB2/AN8/INT2/VMO — Digital I/O RB2 / analog input AN8 / external interrupt 2 / SPP VMO |
| Pin 32 | RB3/AN9/CCP2/VPO — Digital I/O RB3 / analog input AN9 / CCP2 / SPP VPO |
| Pin 33 | RB4/AN11/KBI0 — Digital I/O RB4 / analog input AN11 / interrupt-on-change KBI0 |
| Pin 34 | RB5/KBI1/PGM — Digital I/O RB5 / interrupt-on-change KBI1 / LVP programming |
| Pin 35 | RB6/KBI2/PGC — Digital I/O RB6 / interrupt-on-change KBI2 / ICSP clock |
| Pin 36 | RB7/KBI3/PGD — Digital I/O RB7 / interrupt-on-change KBI3 / ICSP data |
| Pin 37 | RE0/RD — Digital I/O RE0 / Parallel Port read control |
| Pin 38 | RE1/WR — Digital I/O RE1 / Parallel Port write control |
| Pin 39 | RE2/CS — Digital I/O RE2 / Parallel Port chip select |
| Pin 40 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| Pin 41 | VSS — Ground reference |
| Pin 42 | RC3/SCK/SCL — Digital I/O RC3 / SPI clock / I2C clock |
| Pin 43 | RC4/D-/VM — USB D- line (alternate pin) |
| Pin 44 | RC5/D+/VP — USB D+ line (alternate pin) |
Typical Applications
PIC18LF4458-I/PT is suitable for 6 applications: USB HID Peripherals (Keyboard, Mouse, Gamepad), USB-to-UART (CDC) Bridge Adapters, Industrial Data-Acquisition Front-End, Home-Automation Controllers, Consumer Electronics with USB Diagnostics Port, USB Mass-Storage (MSD) Bootloader Devices.
USB HID Peripherals (Keyboard, Mouse, Gamepad)
The PIC18LF4458-I/PT is a strong fit for USB HID class peripherals because its integrated USB 2.0 Full-Speed transceiver eliminates an external PHY and its 48 MHz / 12 MIPS core handles HID polling plus key-matrix or quadrature decoding in real time. The 24 KB Enhanced Flash fits Microchip's free USB stack (CDC, HID, MSD) plus application code, while 2 KB SRAM comfortably holds HID report buffers and protocol state. Operated at 3.3 V from the USB VBUS rail, the LF variant avoids a 5 V regulator, simplifying bus-powered designs. Performance consideration: USB interrupt latency on PIC18F is typically < 5 us at 48 MHz, well within the 1 ms USB frame budget.
Recommended
USB-to-UART (CDC) Bridge Adapters
The PIC18LF4458-I/PT works well as a USB CDC bridge that presents a virtual COM port to the host and converts it to UART on the application side. The on-chip USART (Enhanced) supports up to 5 Mbps, the USB Full-Speed endpoint RAM buffers up to 64-byte packets, and the 48 MHz core runs Microchip's CDC stack without taxing CPU budget. Engineers commonly use this for debugging embedded targets, programming FPGAs over JTAG-to-UART bridges, or replacing legacy RS-232 ports. Performance consideration: at 48 MHz the CDC-to-UART throughput saturates at the UART baud rate (typically 921600 bps to 1 Mbps), with negligible CPU overhead.
Recommended
Industrial Data-Acquisition Front-End
In industrial data-acquisition front-ends, the PIC18LF4458-I/PT samples analog signals with its 10-bit ADC, pre-processes data in firmware, and streams results over USB to a host PC for logging. The industrial -40C to +85C temperature rating supports factory-floor deployment, the nanoWatt sleep modes reduce quiescent current below 1 uA for battery-backed sensors, and the LF voltage range (2.0 V to 5.5 V) accepts directly regulated 3.3 V or 5 V rails. Performance consideration: the 10-bit ADC at 48 MHz clock supports up to ~100 ksps, sufficient for vibration, temperature, and pressure sensors in industrial monitoring.
Recommended
Home-Automation Controllers
The PIC18LF4458-I/PT fits home-automation hubs that need a USB diagnostic/configuration port plus on-board logic for relays, sensors, and wireless modules. Its 34 I/O pins drive multi-channel relay boards or interface with NRF24L01 / LoRa modules over SPI, while the USB port serves as a service-port for firmware update and configuration from a PC. The 3.3 V operation aligns with modern wireless modules, eliminating level shifters. Performance consideration: at 48 MHz the MCU can poll multiple sensor streams and respond to USB control transfers concurrently without dropping USB frames, making it suitable for always-on home gateways.
Recommended
Consumer Electronics with USB Diagnostics Port
In consumer electronics such as toys, fitness devices and small appliances, the PIC18LF4458-I/PT serves as the main MCU and exposes a USB port for factory calibration, firmware updates and field diagnostics. Its low BOM cost (integrated USB, internal oscillator option) reduces part count, the 2 KB RAM holds temporary diagnostic buffers, and the Enhanced Flash supports bootloader-based field updates via USB. Performance consideration: the bootloader portion typically uses < 4 KB Flash, leaving the remainder for application code. LF operation at 3.3 V suits direct Li-ion battery connection via an LDO.
Recommended
USB Mass-Storage (MSD) Bootloader Devices
The PIC18LF4458-I/PT can act as a USB MSD bootloader host or device that appears as a removable drive to a PC, dragging-and-dropping new firmware images. The internal Flash supports self-programming, the 24 KB space accommodates a FAT12/16 MSD stack plus bootloader, and the USB Full-Speed peripheral provides the required Bulk-Only Transport endpoint. Performance consideration: writing 16 KB to internal Flash takes ~1 second at typical row-write rates, so end users see only a brief disconnect during firmware update - acceptable for hobbyist and prosumer applications.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF4458-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF4455-I/PT | PIC18LF4550-I/PT | PIC18F4458-I/PT | PIC18LF4555-I/PT | PIC18LF4455T-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (PT), 10x10 mm | 44-TQFP (PT), 10x10 mm - same | 44-TQFP (PT), 10x10 mm - same | 44-TQFP (PT), 10x10 mm - same | 44-TQFP (PT), 10x10 mm - same | 44-TQFP (PT), 10x10 mm - same |
| Core / CPU Clock | 8-bit PIC18F, 48 MHz | 8-bit PIC18F, 48 MHz - same | 8-bit PIC18F, 48 MHz - same | 8-bit PIC18F, 48 MHz - same | 8-bit PIC18F, 48 MHz - same | 8-bit PIC18F, 48 MHz - same |
| Flash Memory | 24 KB | 24 KB | 32 KB | 24 KB | 48 KB | 24 KB |
| RAM | 2 KB | 2 KB - same | 2 KB - same | 2 KB - same | 2 KB - same | 2 KB - same |
| Supply Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V - same | 2.0 V to 5.5 V - same | 4.2 V to 5.5 V | 2.0 V to 5.5 V - same | 2.0 V to 5.5 V - same |
| USB Peripheral | USB 2.0 Full-Speed, integrated | USB 2.0 Full-Speed, integrated - same | USB 2.0 Full-Speed, integrated - same | USB 2.0 Full-Speed, integrated - same | USB 2.0 Full-Speed, integrated - same | USB 2.0 Full-Speed, integrated - same |
| I/O Pins | 34 | 34 - same | 34 - same | 34 - same | 34 - same | 34 - same |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) - same | -40C to +85C (Industrial) - same | -40C to +85C (Industrial) - same | -40C to +85C (Industrial) - same | -40C to +85C (Industrial) - same |
| Approximate Unit Price (qty 1000) | USD 4.10 (as of 2026-09-28) | USD ~3.95 (as of 2026-09-28) | USD ~4.50 (as of 2026-09-28) | USD ~4.20 (as of 2026-09-28) | USD ~5.10 (as of 2026-09-28) | USD ~3.95 (tape-and-reel, as of 2026-09-28) |
Key Differentiators
- LF variant supports 2.0 V to 5.5 V operation, ideal for 3.3 V-only USB designs (vs PIC18F4458-I/PT)
- 24 KB Flash is sized for cost-sensitive USB HID / CDC designs (vs PIC18LF4550-I/PT)
- Integrated USB 2.0 Full-Speed transceiver eliminates external PHY (vs PIC18LF2550-I/SP (28-pin))
- Industrial -40C to +85C temperature rating (vs Consumer-grade MCU alternatives)
Design Notes
Route the USB D+ (pin 16) and D- (pin 15) differential pair with 90 ohm differential impedance, length-matched within 2 mm, and place the VUSB decoupling capacitor (0.1 uF ceramic plus 4.7 uF bulk) within 3 mm of the VUSB pin. The D+/D- traces should be kept away from clock and switching signals to minimize radiated EMI on the USB bus. Refer to Microchip AN612 - PCB Design Guidelines for USB 2.0 for a complete checklist.
Place a 0.1 uF ceramic decoupling capacitor on each VDD pin (11, 32) and each AVVD/VSS pair, with the capacitor loop area kept under 25 mm^2 to minimize inductance. The PIC18LF4458's internal USB 3.3 V regulator requires VUSB decoupling to meet USB suspend current specifications; without proper decoupling the regulator may oscillate and cause USB enumeration failures. Estimated: total bulk capacitance budget is ~10 uF across VDD rails for reliable USB operation at full speed.
Do not connect MCLR (pin 1) directly to VDD without a 10 kohm pull-up resistor and 100 nF capacitor to ground for proper reset behavior. Always configure the CONFIG words (especially the oscillator, watchdog and brown-out settings) before code execution; failure to do so is the most common reason prototypes refuse to start. For low-voltage (LF) operation below 3.0 V, ensure the BOR (Brown-Out Reset) voltage is configured for the appropriate trip point.
When using the on-chip USB transceiver in low-speed mode (1.5 Mbps), the D- line has an internal pull-up that may interfere with low-power sleep modes; configure the UPUEN bit appropriately before entering sleep. For Full-Speed USB, ensure the internal 96 MHz PLL is locked (check the USB PLL lock status bit) before USB transactions to avoid framing errors.
The 44-pin TQFP package has a typical theta_JA of ~50 C/W in still air, so thermal management is rarely a concern for USB MCU applications where typical power consumption is below 50 mW. However, in industrial enclosures with no airflow, derate by ~20% from the datasheet maximum ratings. The PIC18LF4458 LF variant dissipates less power than the F variant at equivalent clock speeds due to the lower core voltage.
Compliance Information
Lead-free TQFP package per Microchip product page. Not AEC-Q100 qualified - this is a general-purpose MCU; automotive designs should use the AEC-Q100-qualified PIC18F variants in the same family. RoHS and REACH compliant per Microchip environmental documentation.