PIC18LF4458T-I/ML - 48MHz 8-Bit USB MCU 24KB Flash 44-QFN | Microchip
N.º da peça: PIC18LF4458T-I/ML ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $6.85 | $6,85 |
| 10 | $6.32 | $63,20 |
| 100 | $5.74 | $574,00 |
| 500 | $5.1 | $2.550,00 |
| 1.000 | $4.55 | $4.550,00 |
PIC18LF4458T-I/ML Visão geral
A PIC18 microcontroller is an 8-bit reduced-instruction-set computing (RISC) engine using a modified Harvard architecture with separate program and data buses; the PIC18 family specifically adds 16-bit instructions, hardware multiply, and a C-optimized instruction set that bridges legacy 8-bit code with modern C compilers. Within Microchip's hierarchy, PIC18 sits between baseline PIC10/12/16 and the 16-bit dsPIC/PIC24 families, targeting mid-range embedded USB, sensing, and human-interface applications where deterministic real-time response and low cost matter more than raw MIPS.
Key features of the PIC18LF4458T-I/ML include a full-speed USB 2.0 FS transceiver with on-chip 3.3V regulator and 1.5 kB of endpoint RAM; a 12-channel 10-bit ADC with auto-acquisition; two USARTs, one SPI, and one I2C (Master/Slave); a 16-bit timer/counter plus two 8-bit timers; a 9-channel 10-bit PWM module; nanoWatt power management with multiple idle/sleep modes; and 34 digital I/O pins tolerant of 5V logic on a VDD-Domain digital supply.
Architecturally, the device integrates an internal 8 MHz oscillator with a 4x PLL (yielding the 48 MHz FOSC) and supports crystal, resonator, and external clock sources. The 24 KB Flash is partitioned for a 32 KB bootloader-compatible region, while the 2 KB SRAM supports USB endpoint buffer allocation. The exposed pad (EP) of the QFN-44 must be soldered to a sufficient ground copper pour to meet the 31 C/W theta-JC thermal envelope; otherwise the silicon will fold back oscillator activity when junction temperature exceeds 150C.
Typical applications include USB Human Interface Devices (HID keyboards, mice, game controllers), CDC virtual COM ports, low-speed instrumentation bridges, industrial sensor nodes with USB firmware update, and legacy serial-port-to-USB migration designs. Industrial-grade temperature and wide VDD also suit process-control front ends and battery-backed accessories.
Design tip: route the USB D+/D- pair as a 90-ohm differential, place the VBUS-sense resistor within 5 mm of the VBUS pin, and tie the exposed pad to a continuous GND pour. For EMI-sensitive links, the internal 3.3V USB regulator should be bypassed with 1 uF X7R plus 100 nF at the pin.
This page consolidates distributor pricing, drop-in alternatives, and practical design guidance beyond what is found in the manufacturer datasheet alone.
Alternativas drop-in para PIC18LF4458T-I/ML — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com PIC18LF4458T-I/ML (mesmo formato e footprint) — diferindo em Package, Core Architecture, Operating Temperature, ADC, Timers.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PIC18LF4455T-I/ML
✅ Drop-In✓ Em estoque
$5.2 / unidade
Ver ficha técnica →PIC18LF4450T-I/ML
✅ Drop-In✓ Em estoque
$2.55 / unidade
Ver ficha técnica →PIC18LF4550T-I/ML
✅ Drop-In✓ Em estoque
$3.28 / unidade
Ver ficha técnica →PIC18LF4458-I/ML
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC18LF2458T-I/ML
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC18LF4550-I/ML
✅ Drop-In✓ Em estoque
$5.4 / unidade
Ver ficha técnica →PIC18LF4458T-I/ML Classificações máximas e características elétricas
| Core Architecture | PIC 8-bit (Harvard, RISC) |
| Family | PIC18F |
| Core Frequency | 48 MHz (12 MIPS) |
| Program Memory | 24 KB Flash (12K x 16) |
| Data Memory (SRAM) | 2 KB |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| USB | USB 2.0 Full-Speed (12 Mbps), on-chip transceiver + 3.3V LDO |
| Timers | 1 x 16-bit, 2 x 8-bit |
| Communication | 2x USART, 1x SPI, 1x I2C (M/S) |
| Temperatura de operação | -40 C to +85 C (Industrial) |
| Encapsulamento | 44-QFN (8x8 mm) with Exposed Pad |
| Tipo de montagem | Surface Mount |
| RoHS | Compliant (Lead-Free) |
| Packaging | Tape & Reel |
Configuração de pinos do PIC18LF4458T-I/ML
| Pino 1 | RC7/RX/DT/SDO — I/O port C bit 7 / USART RX / I/O |
| Pino 2 | RD4 — I/O port D bit 4 |
| Pino 3 | RD5 — I/O port D bit 5 |
| Pino 4 | RD6 — I/O port D bit 6 |
| Pino 5 | RD7 — I/O port D bit 7 |
| Pino 6 | VSS — Ground reference |
| Pino 7 | VDD — Positive supply (2.0V-5.5V) |
| Pino 8 | RB0/INT0 — I/O port B bit 0 / External interrupt 0 |
| Pino 9 | RB1/INT1 — I/O port B bit 1 / External interrupt 1 |
| Pino 10 | RB2/INT2 — I/O port B bit 2 / External interrupt 2 |
| Pino 11 | RB3/CCP2 — I/O port B bit 3 / CCP2 |
| Pino 12 | RB4 — I/O port B bit 4 |
| Pino 13 | RB5/PGM — I/O port B bit 5 / LVP programming |
| Pino 14 | RB6/PGC — I/O port B bit 6 / ICSP clock |
| Pino 15 | RB7/PGD — I/O port B bit 7 / ICSP data |
| Pino 16 | VUSB3V3 — Internal USB 3.3V regulator output (bypass to GND) |
| Pino 17 | VBUS — USB VBUS sensing input (5V from host) |
| Pino 18 | D- — USB data minus (differential pair) |
| Pino 19 | D+ — USB data plus (differential pair) |
| Pino 20 | VDD — Positive supply (2.0V-5.5V) |
| Pino 21 | VSS — Ground reference |
| Pino 22 | OSC1/CLKIN — Crystal/oscillator input |
| Pino 23 | OSC2/CLKOUT — Crystal/oscillator output |
| Pino 24 | RA0/AN0 — I/O port A bit 0 / ADC input 0 |
| Pino 25 | RA1/AN1 — I/O port A bit 1 / ADC input 1 |
| Pino 26 | RA2/AN2/VREF- — I/O port A bit 2 / ADC input 2 / VREF- |
| Pino 27 | RA3/AN3/VREF+ — I/O port A bit 3 / ADC input 3 / VREF+ |
| Pino 28 | RA4/T0CKI — I/O port A bit 4 / Timer0 clock input |
| Pino 29 | RA5/AN4/SS — I/O port A bit 5 / ADC input 4 / SPI slave select |
| Pino 30 | RE0/AN5 — I/O port E bit 0 / ADC input 5 |
| Pino 31 | RE1/AN6 — I/O port E bit 1 / ADC input 6 |
| Pino 32 | RE2/AN7 — I/O port E bit 2 / ADC input 7 |
| Pino 33 | VDD — Positive supply (2.0V-5.5V) |
| Pino 34 | VSS — Ground reference |
| Pino 35 | RC0/T1OSO/T1CKI — I/O port C bit 0 / Timer1 oscillator out / Timer1 clock in |
| Pino 36 | RC1/T1OSI/CCP2 — I/O port C bit 1 / Timer1 oscillator in / CCP2 |
| Pino 37 | RC2/CCP1 — I/O port C bit 2 / CCP1 |
| Pino 38 | RC3/SCK/SCL — I/O port C bit 3 / SPI clock / I2C clock |
| Pino 39 | RC4/SDI/SDA — I/O port C bit 4 / SPI data in / I2C data |
| Pino 40 | RC5/SDO — I/O port C bit 5 / SPI data out |
| Pino 41 | RC6/TX/CK — I/O port C bit 6 / USART TX / USART clock |
| Pino 42 | RD0 — I/O port D bit 0 |
| Pino 43 | RD1 — I/O port D bit 1 |
| Pino 44 | RD2 — I/O port D bit 2 |
| Pino EP | EP — Exposed thermal pad - tie to GND for thermal dissipation |
Aplicações típicas
PIC18LF4458T-I/ML é adequado para 6 aplicaçãos: USB HID Peripherals (Keyboard, Mouse, Game Controller), USB CDC Virtual COM Port Bridge, Industrial Sensor Node with USB Diagnostics, Battery-Powered USB Charging Cable Identity Dongle, USB Bootloader / Field Firmware Update Target, Legacy RS-232 to USB Migration Adapter.
USB HID Peripherals (Keyboard, Mouse, Game Controller)
The PIC18LF4458T-I/ML is purpose-built for USB Human Interface Devices because it integrates a full-speed USB 2.0 transceiver, 1.5 KB endpoint RAM, and an internal 3.3V LDO that draws power directly from VBUS - eliminating the need for an external PHY or regulator. Its 48 MHz core delivers 12 MIPS, enough to scan matrix keybeds at >1 kHz while still serving the USB 1 ms polling interval. The 2.0V-5.5V VDD lets the same board power from a 2-cell Li-ion pack or USB 5V rail. Place a 90-ohm D+/D- differential pair, a 1.5 kohm pull-up on D+, and tie the exposed pad to GND; the bootloader HID descriptor can reflash the 24 KB Flash over USB without an external programmer.
Recomendado
USB CDC Virtual COM Port Bridge
The PIC18LF4458T-I/ML is widely used in USB-to-UART bridge designs replacing legacy RS-232 adapters. Its integrated USB FS transceiver plus a CDC class-compliant firmware stack (Microchip MLA) lets the device enumerate as a virtual COM port on Windows, macOS, and Linux without driver installation. The 48 MHz core drives CDC at 921600 baud with negligible CPU load, while the 2 KB SRAM buffers USB OUT packets without overflow. Place a 1 uF X7R bypass on VUSB3V3 and route D+/D- as a 90-ohm differential; this is sufficient to replace FTDI-style bridges at lower cost while keeping a single-IC BOM. Suitable for industrial sensor readout, debug consoles, and firmware update channels.
Recomendado
Industrial Sensor Node with USB Diagnostics
The PIC18LF4458T-I/ML fits industrial sensor-front-end designs that need both 5V analog sensor excitation and a USB maintenance port. The 2.0V-5.5V VDD range lets a 24V-to-5V LDO (e.g., LM7805) power the MCU directly while the on-chip ADC reads process variables. The 34 I/O pins support SPI/I2C sensor clusters, and the USB port enables field technicians to attach a laptop for live diagnostics and firmware updates. Industrial -40C to +85C rating suits factory floor operation. The exposed pad must be soldered to a continuous GND pour for thermal dissipation; failed pads are the #1 cause of field returns on QFN packages.
Recomendado
Battery-Powered USB Charging Cable Identity Dongle
The PIC18LF4458T-I/ML's nanoWatt idle modes and 2.0V minimum VDD make it suitable for USB cable identity dongles that announce negotiated current to phones. Drawing <1 uA in sleep, the device wakes on VBUS attach, enumerates as a HID or vendor device, and reports cable ratings to the charging host. The 24 KB Flash stores firmware and cable-descriptor look-up tables, while 2 KB SRAM holds USB endpoint buffers. Place the device directly across the USB D+/D- lines with 15 kohm pulldowns, use a 47 nF VBUS decoupling cap, and ensure the exposed pad grounds to dissipate any hot-plug inrush.
Recomendado
USB Bootloader / Field Firmware Update Target
The PIC18LF4458T-I/ML includes a self-programmable Flash region that Microchip's USB bootloader (HID-class) can target for in-field firmware updates. A 32 KB bootloader region fits entirely inside the 24 KB Flash budget of the 4458 when paired with a smaller application, or the higher-Flash 4450/4550 variants can host both the bootloader and a larger app. This eliminates the need for ICSP headers on production PCBs. Route D+/D- with 90-ohm differential, add ESD protection diodes to VBUS, and use Microchip's HID Bootloader PC host tool to push HEX files. Power comes directly from USB VBUS - no external LDO needed.
Recomendado
Legacy RS-232 to USB Migration Adapter
The PIC18LF4458T-I/ML is used to migrate legacy RS-232 designs to USB by replacing the DE-9 connector and line driver with a USB CDC bridge on the same PCB. The 48 MHz core bit-bangs RS-232 at up to 115200 baud while managing the USB endpoint; an external MAX3232 converts to +/-6V logic if true RS-232 levels are required for legacy peripherals. The 2 KB SRAM buffers CDC transfers at line rate, and the exposed-pad QFN-44 keeps the BOM compact for dongle-style adapters. Suitable for industrial PLC programming cables, label printers, and POS terminals.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PIC18LF4458T-I/ML — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | PIC18LF4455T-I/ML | PIC18LF4450T-I/ML | PIC18LF4550T-I/ML | PIC18LF4458-I/ML | PIC18LF2458T-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (8x8 mm) with EP | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same |
| Core Frequency | 48 MHz (12 MIPS) | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Program Flash | 24 KB | 24 KB (same) | 32 KB (+33%) | 32 KB (+33%) | 24 KB (same) | 24 KB (same) |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| I/O Pins | 34 | 34 | 34 | 34 | 34 | 24 (-29%) |
| Supply 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 | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| USB FS | Yes (integrated) | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Packaging | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel | Tube | Tape & Reel |
Principais diferenciais
- Drop-in compatible with PIC18LF4455T-I/ML for cost-down variants (vs PIC18LF4455T-I/ML)
- Expandable to 32 KB Flash without PCB changes (vs PIC18LF4550T-I/ML)
- Wide VDD 2.0V-5.5V supports 2xAA battery designs (vs PIC18F4550-I/P)
Notas de projeto
The 44-QFN (8x8 mm) exposed pad (EP) MUST be soldered to a continuous GND copper pour spanning at least 2 square inches of board copper. Per the Microchip PIC18F4458 family datasheet, a floating or undersized EP increases junction-to-ambient thermal resistance above the 31 C/W budget and causes oscillator fold-back or erratic reset behavior. Place 25-30 thermal vias (0.3 mm drill, 0.6 mm pitch) inside the EP region stitched to the bottom-layer GND plane for optimal heat extraction.
Route the USB D+ and D- pair as a 90-ohm differential (each trace 0.20 mm wide on 0.20 mm spacing for 1.6 mm FR-4), matching length to within 2 mm, and shield with a continuous GND pour on both sides with stitched vias. Place the ESD protection diodes within 5 mm of the USB connector. The 1.5 kohm pull-up on D+ selects full-speed USB; place this resistor as close to the D+ pin as possible to avoid impedance discontinuities. Source: Microchip PIC18F4458 family datasheet, USB section.
The internal USB 3.3V regulator (VUSB3V3 pin) must be bypassed with a 1 uF X7R ceramic plus a 100 nF NP0/C0G in parallel, placed within 3 mm of the pin. This internal regulator sources current from VBUS and powers the USB transceiver; if VBUS is absent (self-powered designs) the regulator is disabled and the device falls back to VDD for the USB PHY. Never short VUSB3V3 to VDD - the regulator is for USB PHY only.
Configuration word programming: the CONFIG1L register's PLLDIV bits must be set to divide-by-5 (96 MHz -> 48 MHz USB clock) for correct USB operation with the 20 MHz crystal mode - misprogramming the PLL configuration yields a 24 MHz USB clock and enumerates as low-speed USB, not full-speed. Also note: the 'F' vs 'LF' VDD range selection must match VDD - applying 5V to a PIC18F4458 (which expects 4.2V-5.5V max) is fine, but a 3.3V supply to PIC18F4458 fails start-up.
Informações de conformidade
RoHS compliant per Microchip product page (verified 2026-09-28). Industrial temperature -40C to +85C. Not AEC-Q100 qualified; choose AEC-Q100 qualified PIC18 variants for automotive.