PIC18F4458T-I/ML - 48MHz 8-bit USB MCU, 24KB Flash | Microchip
MPN: PIC18F4458T-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.7 | $2,350.00 |
| 1,000 | $4.25 | $4,250.00 |
PIC18F4458T-I/ML Overview
An 8-bit microcontroller is a programmable semiconductor that executes instructions from on-chip program memory while exposing digital and analog peripherals through its I/O pins. The PIC18 family extends this concept with a 16-bit instruction word, hardware multiplier, and C-friendly architecture. Within the broader hierarchy, the PIC18F4458 sits as a microcontroller -> MCU -> embedded processor -> semiconductor, and is optimized for cost-sensitive USB-enabled embedded systems.
Key differentiating features include a 10-bit ADC with up to 13 channels, two analog comparators, a 10-bit Pulse-Width Modulation (PWM) module, and nanoWatt power management that drops Iq to microampere levels in sleep. The device supports In-Circuit Serial Programming (ICSP) via two pins, enabling field upgrades without bootloader code space. With 36 digital I/O pins and supply voltage range of 4.2 V to 5.5 V, it accommodates both 5 V industrial logic and USB bus-powered designs.
Architecturally, the PIC18F4458 employs a Harvard architecture with separate program and data buses, an 8-bit ALU with hardware multiply, and a 16-bit instruction set. The USB SIE (Serial Interface Engine) is hardware-implemented, offloading bit-level USB protocol processing from the CPU and leaving MIPS for application code. Internal oscillator modes reduce BOM count, while the standard 44-pin QFN package supports surface-mount manufacturing and provides a thermal pad for improved dissipation.
Typical applications include USB human-interface devices (HID) such as keyboards, mice and game controllers, USB-to-serial bridges, industrial data loggers with USB connectivity, low-cost instrumentation front-ends, and embedded educational platforms. The combination of USB, generous peripherals and PIC ecosystem maturity makes this part a common choice for legacy USB designs and educational lab kits.
When designing with this device, ensure the USB D+/D- trace impedance is controlled to 90 ohms differential and that the VUSB pin has the recommended 220 nF decoupling network. The internal USB pull-up resistor can be software-enabled to eliminate an external component. For low-power designs, leverage nanoWatt sleep modes and the on-chip low-power timer (Timer1) for periodic wake-up.
This page synthesizes verified distributor pricing, drop-in alternatives within the same PIC18F4458 family, and practical design notes not aggregated in a single document by the manufacturer. It is intended to accelerate part selection, BOM validation, and footprint reuse for USB-capable embedded designs.
Drop-in alternatives for PIC18F4458T-I/ML — 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 PIC18F4458T-I/ML (same form factor and footprint) — differing in Package, Core Architecture, Timers, Operating Temperature, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F4458-I/ML
✅ Drop-In✓ In Stock
$5.95 / Unit
View Datasheet →PIC18F4553-I/ML
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →PIC18F4455-I/PT
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC18F4450-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4458T-I/ML Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit RISC, 16-bit instruction word) |
| Maximum Clock Speed | 48 MHz |
| Program Memory (Flash) | 24 KB (12K x 16) |
| Data SRAM | 2 KB |
| Data EEPROM | 256 bytes |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| Digital I/O Pins | 36 |
| ADC | 10-bit, up to 13 channels |
| PWM Channels | 10-bit PWM, multiple channels |
| USB Interface | USB 2.0 Full-Speed (12 Mbit/s), on-chip SIE |
| Serial Interfaces | I2C, SPI (up to 10 Mbit/s), Enhanced USART |
| Timers | Multiple 8/16-bit timers including Timer1 low-power |
| Comparators | 2 analog comparators |
| Package | 44-pin QFN (ML), 8x8 mm |
| Operating Temperature | -40C to +85C (Industrial, I grade) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC18F4458T-I/ML Pin Configuration
| Pin 1 | RB0/AN12/INT0/FLT0 — PORTB bit 0, analog input, external interrupt |
| Pin 2 | RB1/AN10/INT1 — PORTB bit 1, analog input, external interrupt |
| Pin 3 | RB2/AN8/INT2 — PORTB bit 2, analog input, external interrupt |
| Pin 4 | RB3/AN9/CCP2 — PORTB bit 3, analog input, capture/compare PWM |
| Pin 5 | RB4/AN11 — PORTB bit 4, analog input |
| Pin 6 | RB5/AN13 — PORTB bit 5, analog input |
| Pin 7 | RB6/PGC — PORTB bit 6, ICSP clock |
| Pin 8 | RB7/PGD — PORTB bit 7, ICSP data |
| Pin 9 | VUSB — USB internal 3.3V regulator output |
| Pin 10 | VDD — Positive supply voltage |
| Pin 11 | GND — Ground reference |
| Pin 12 | OSC1/CLKI — Crystal oscillator input or external clock |
| Pin 13 | OSC2/CLKO — Crystal oscillator output |
| Pin 14 | RC0 — PORTC bit 0 |
| Pin 15 | RC1 — PORTC bit 1 |
| Pin 16 | RC2 — PORTC bit 2 |
| Pin 17 | RC3 — PORTC bit 3 |
| Pin 18 | RC4 — PORTC bit 4 |
| Pin 19 | RC5 — PORTC bit 5 |
| Pin 20 | RC6 — PORTC bit 6 |
| Pin 21 | RC7 — PORTC bit 7 |
| Pin 22 | RD0 — PORTD bit 0 |
| Pin 23 | RD1 — PORTD bit 1 |
| Pin 24 | RD2 — PORTD bit 2 |
| Pin 25 | RD3 — PORTD bit 3 |
| Pin 26 | RD4 — PORTD bit 4 |
| Pin 27 | RD5 — PORTD bit 5 |
| Pin 28 | RD6 — PORTD bit 6 |
| Pin 29 | RD7 — PORTD bit 7 |
| Pin 30 | RE0 — PORTE bit 0 |
| Pin 31 | RE1 — PORTE bit 1 |
| Pin 32 | RE2 — PORTE bit 2 |
| Pin 33 | RE3 — PORTE bit 3 |
| Pin 34 | RA0/AN0 — PORTA bit 0, analog input |
| Pin 35 | RA1/AN1 — PORTA bit 1, analog input |
| Pin 36 | RA2/AN2 — PORTA bit 2, analog input |
| Pin 37 | RA3/AN3/VREF+ — PORTA bit 3, analog reference |
| Pin 38 | RA4/T0CKI — PORTA bit 4, timer0 clock |
| Pin 39 | RA5/AN4 — PORTA bit 5, analog input |
| Pin 40 | RA6/OSC2 — PORTA bit 6 / alternate oscillator |
| Pin 41 | RA7/OSC1 — PORTA bit 7 / alternate oscillator |
| Pin 42 | MCLR/VPP — Reset / programming voltage |
| Pin 43 | D- — USB data minus |
| Pin 44 | D+ — USB data plus |
Typical Applications
PIC18F4458T-I/ML is suitable for 6 applications: USB Human Interface Devices, USB-to-Serial Bridge Adapters, Industrial Data Loggers with USB Output, Low-Cost USB Instrumentation Front-Ends, USB-Connected Educational Platforms, Embedded Lighting and Motor Control via USB.
USB Human Interface Devices
The PIC18F4458T-I/ML is widely used in USB HID peripherals such as keyboards, mice, gamepads and custom input controllers. Its on-chip USB 2.0 Full-Speed SIE (12 Mbit/s) offloads bit-level USB protocol processing from the 48 MHz PIC18 core, freeing CPU cycles for HID report generation, matrix scanning, debounce and LED handling. The internal 3.3 V USB pull-up can be software-enabled, eliminating an external resistor and reducing BOM. With 24 KB of Flash, the device comfortably fits standard HID report descriptors, bootloaders, and application firmware. Compared with discrete USB implementations using FTDI bridges, the 4458 reduces PCB area, lowers unit cost, and removes external crystal requirements for low-speed USB.
Recommended
USB-to-Serial Bridge Adapters
The PIC18F4458T-I/ML can act as a CDC-class USB-to-UART bridge, replacing commercial bridges such as the FT232R or CP2102N while consolidating the function into a single MCU. The integrated Enhanced USART (EUSART) supports baud rates up to several Mbaud, and 2 KB of SRAM handles USB endpoint buffers alongside user data. Engineers can implement RTS/CTS hardware flow control and DTR/DSR modem signals through the 36 available I/O pins. The 48 MHz MIPS rating ensures low USB latency even at high serial data rates. Typical use cases include industrial configuration ports, debug consoles for headless systems, and field-upgradeable firmware uploaders in factory equipment.
Recommended
Industrial Data Loggers with USB Output
Industrial data loggers benefit from the PIC18F4458T-I/ML's combination of USB connectivity for host download, a 10-bit ADC with up to 13 channels for sensor reading, 256 bytes of EEPROM for non-volatile configuration, and nanoWatt Technology for battery-friendly operation between samples. The 48 MHz core can service multi-channel ADC scans while maintaining a real-time USB CDC stream. The 4.2 V to 5.5 V supply range accommodates industrial 5 V rails, while the -40C to +85C industrial temperature grade supports factory-floor environments. The internal EEPROM stores calibration coefficients, sample-rate settings, and device identifiers that persist across power cycles.
Recommended
Low-Cost USB Instrumentation Front-Ends
Bench instruments such as USB voltmeters, simple logic analyzers, and educational lab tools use the PIC18F4458T-I/ML as the USB-connected brain that streams sampled data to a host PC. The 10-bit ADC provides adequate resolution for many educational and hobby measurements, while the USB bulk or interrupt endpoints move sample data efficiently. With 24 KB of Flash, firmware can include calibration routines, command parsers, and USB descriptors without code-space pressure. The 44-pin QFN (ML) 8x8 mm package keeps the entire analog front-end plus MCU on a compact PCB, ideal for pocketable instruments and student lab kits.
Recommended
USB-Connected Educational Platforms
University courses and maker communities adopt the PIC18F4458T-I/ML for teaching embedded USB design because the part combines the friendly PIC18 instruction set, MPLAB X IDE support, and an on-chip USB SIE that hides low-level protocol complexity. Students can implement HID, CDC, and vendor-class devices without external PHY chips. The 44-pin QFN exposes enough I/O for breadboard-friendly breakout boards, while the 48 MHz core and 24 KB Flash allow nontrivial coursework projects such as USB MIDI controllers, custom gamepads, and embedded web servers via CDC. RoHS compliance ensures the part ships in modern educational kits.
Recommended
Embedded Lighting and Motor Control via USB
The PIC18F4458T-I/ML's 10-bit PWM module, multiple timers, and USB connectivity make it a fit for USB-controlled LED drivers, fan controllers, and small DC motor H-bridge interfaces. A host PC or embedded master can stream brightness, RPM or torque commands over USB bulk or vendor endpoints, while the PIC18 core generates PWM waveforms and reads back analog currents via the 10-bit ADC. The 36 I/O pins support multiple PWM channels, quadrature encoder inputs, and direction-control signals. Compared with a discrete USB-to-PWM bridge plus microcontroller, this integration reduces BOM and improves firmware maintainability.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F4458T-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F4458-I/ML | PIC18F4553-I/ML | PIC18F4455-I/PT | PIC18F4450-I/ML |
|---|---|---|---|---|---|
| Package | 44-pin QFN (ML) 8x8 mm | 44-pin QFN (ML) - same | 44-pin QFN (ML) - same | 44-pin TQFP (PT) | 44-pin QFN (ML) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Architecture | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC |
| Maximum Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Program Memory | 24 KB | 24 KB | 32 KB | 24 KB | 16 KB |
| Data SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| Data EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| USB Interface | USB 2.0 Full-Speed (12 Mbit/s) | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed |
| I/O Pins | 36 | 36 | 36 | 36 | 36 |
| Supply Voltage | 4.2 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 | 4.2 V to 5.5 V |
Key Differentiators
- Tape and reel packaging for high-volume SMT assembly (vs PIC18F4458-I/ML)
- Balanced Flash size for HID + small vendor USB stacks (vs PIC18F4450T-I/ML)
- QFN-44 package for compact designs (vs PIC18F4455-I/PT)
Design Notes
The USB D+ and D- traces must be routed as a 90-ohm differential pair with controlled impedance, keeping stubs short and matching trace lengths within 150 mil. Place the VUSB decoupling capacitor (typically 220 nF) within 2 mm of the VUSB pin. The 44-pin QFN (ML) thermal pad must be soldered to a ground copper pour of at least 25 mm^2 to meet the datasheet thermal resistance and to suppress USB common-mode noise.
When the PIC18F4458T-I/ML is USB bus-powered, the internal 3.3 V regulator on VUSB can supply up to approximately 250 mA to external circuitry. Ensure total VBUS-derived current stays within USB inrush and suspend-current limits (less than 2.5 mA average during USB suspend). Add bulk capacitance of at least 4.7 uF on VDD and a 100 nF decoupling capacitor within 3 mm of each VDD pin pair to handle USB burst events.
Do not enable the internal USB pull-up resistor on D+ before the host has finished enumeration, or the host will see an illegal connect/disconnect. Configure CONFIG1L for the correct oscillator mode (HS, HSPLL or INTXT) to match the crystal or resonator used. When migrating from PIC18F4455 (TQFP-44) to the PIC18F4458 (QFN-44), confirm the land pattern because the QFN thermal pad and pin pitch differ from the TQFP gull-wing leads.
Estimated: based on a typical 4-layer FR-4 stack-up with 1 oz copper outer layers, a 44-pin QFN (ML) at 48 MHz and 5 V supply dissipates under 200 mW in normal USB applications. The exposed thermal pad connected to the ground plane provides theta_JA around 30 C/W, giving negligible self-heating. For high-current GPIO driving designs above 50 mA per pin group, increase the ground copper pour or add thermal vias under the EP.
Compliance Information
RoHS and REACH compliance per Microchip product page. Industrial temperature grade (-40C to +85C) only - no AEC-Q100 automotive variant in the PIC18F4458 family. Halogen-free per Microchip material declarations.
