PIC18LF2458T-I/SO - 8-bit 48MHz 24KB Flash USB MCU | Microchip
MPN: PIC18LF2458T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.36 | $336.00 |
| 500 | $3.02 | $1,510.00 |
| 1,000 | $2.74 | $2,740.00 |
PIC18LF2458T-I/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripherals such as timers, communication interfaces, and analog blocks. The PIC18F family is Microchip's enhanced 8-bit architecture, sitting above the PIC16 baseline family in the company's 8-bit portfolio and below the PIC24/dsPIC16-bit families. Within the PIC18F hierarchy, the LF2458 belongs to the USB-capable sub-family and is differentiated from the LF2455 by 4 KB more program memory and from the LF2550/4550 by a smaller 28-pin footprint. PIC18F devices are widely used in cost-sensitive embedded designs where 8-bit simplicity, low power, and deterministic interrupt latency outweigh the need for 32-bit throughput.
Key features of this part include a 48 MHz internal oscillator (12 MIPS instruction throughput), a full-speed USB 2.0 SIE with internal pull-up, 10-channel 12-bit ADC, 24 general-purpose I/O pins, two USART modules, two MSSP (SPI/I2C) modules, two CCP/ECCP capture-compare-PWM blocks, and a 32 kHz secondary oscillator for low-power Real-Time-Clock operation. Brown-out Reset, Power-on Reset, Watchdog Timer, and High/Low-Voltage Detect complete the safety feature set.
The device is fabricated on an enhanced FLASH process with nanoWatt XLP deep-sleep modes that draw under 1 µA, making it attractive for battery-powered USB peripherals, HID-class devices, and always-on industrial sensors. Its wide 2.0-5.5 V VDD range and on-chip USB transceiver eliminate the external USB PHY typically required by competing 8-bit MCUs.
Typical applications include USB-to-UART bridges, USB Human Interface Devices (keyboard, mouse, gamepad), low-speed data loggers, capacitive-touch front panels, industrial sensor transmitters with USB diagnostics, and educational platforms where the PIC18 USB stack is supported by Microchip's free MLA framework.
When laying out the PCB, keep the 28-SOIC VDD/VSS pair short and place a 100 nF decoupling cap within 3 mm of each supply pin. The USB D+/D- traces should be 90 Ω differential and length-matched, with the VBUS sense line routed to a 5V-tolerant I/O.
This page synthesizes distributor pricing, drop-in PIC18F alternatives in the same 28-SOIC footprint, and practical design notes that are not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18LF2458T-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 PIC18LF2458T-I/SO (same form factor and footprint) — differing in Package, ADC, Core Architecture, I/O Pins, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF2458-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF2455T-I/SO
✅ Drop-In✓ In Stock
$4.05 / Unit
View Datasheet →PIC18LF2455-I/SO
✅ Drop-In✓ In Stock
$2.05 / Unit
View Datasheet →PIC18F2550T-I/SO
✅ Drop-In✓ In Stock
$4.83 / Unit
View Datasheet →PIC18F2455T-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF2458T-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18F enhanced 8-bit RISC |
| Program Memory (Flash) | 24 KB (12K x 16 words) |
| Data EEPROM | 256 bytes |
| Data SRAM | 2 KB |
| Maximum CPU Frequency | 48 MHz (12 MIPS) |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| I/O Pins | 24 general-purpose |
| ADC | 10-channel, 12-bit |
| USB Module | USB 2.0 Full-Speed SIE with internal pull-up |
| Timers | 4 (Timer0/1/2/3) |
| CCP/ECCP Modules | 2 |
| UART | 2 (Enhanced USART) |
| SPI / I2C | 2 MSSP (SPI and I2C) |
| Package | 28-pin SOIC (SO), 7.50 mm body |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| Brown-out Reset / POR / WDT | Yes / Yes / Yes |
| nanoWatt XLP Deep Sleep | Yes (<1 µA typical) |
PIC18LF2458T-I/SO Pin Configuration
| Pin 1 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| Pin 2 | RA3/AN3/VREF+ — Port A bit 3 / Analog input 3 / ADC VREF+ |
| Pin 3 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Pin 4 | RA5/AN4/SS — Port A bit 5 / Analog input 4 / SPI slave select |
| Pin 5 | VSS — Ground reference |
| Pin 6 | OSC1/CLKI — Crystal oscillator input / external clock |
| Pin 7 | OSC2/CLKO — Crystal oscillator output / clock output |
| Pin 8 | VUSB — Internal USB 3.3 V regulator output (decoupling pin) |
| Pin 9 | RC0 — Port C bit 0 |
| Pin 10 | RC1 — Port C bit 1 |
| Pin 11 | RC2 — Port C bit 2 |
| Pin 12 | VSS — Ground reference (second VSS pin) |
| Pin 13 | RC4/D- — Port C bit 4 / USB D- |
| Pin 14 | RC5/D+ — Port C bit 5 / USB D+ |
| Pin 15 | RC6/TX/CK — Port C bit 6 / USART1 TX / clock |
| Pin 16 | RC7/RX/DT — Port C bit 7 / USART1 RX / data |
| Pin 17 | RB0/AN12/INT0 — Port B bit 0 / Analog input 12 / External interrupt 0 |
| Pin 18 | RB1/AN10/INT1 — Port B bit 1 / Analog input 10 / External interrupt 1 |
| Pin 19 | RB2/AN8 — Port B bit 2 / Analog input 8 |
| Pin 20 | RB3/AN9 — Port B bit 3 / Analog input 9 |
| Pin 21 | RB4/AN11 — Port B bit 4 / Analog input 11 |
| Pin 22 | RB5/AN13 — Port B bit 5 / Analog input 13 |
| Pin 23 | RB6/PGC — Port B bit 6 / ICSP clock |
| Pin 24 | RB7/PGD — Port B bit 7 / ICSP data |
| Pin 25 | VSS — Ground reference (third VSS pin) |
| Pin 26 | VDD — Positive supply 2.0-5.5 V |
| Pin 27 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Pin 28 | RA1/AN1 — Port A bit 1 / Analog input 1 |
Typical Applications
PIC18LF2458T-I/SO is suitable for 6 applications: USB-to-UART Bridge, USB HID Peripheral (Keyboard / Mouse / Gamepad), Industrial Sensor with USB Diagnostics Port, Capacitive-Touch Front Panel Controller, Educational / Maker USB Development Platform, Low-Speed USB Data Logger.
USB-to-UART Bridge
The PIC18LF2458T-I/SO is well suited as a USB-to-UART bridge because its integrated full-speed USB 2.0 SIE plus two enhanced USARTs eliminate the external PHY and a second bridge IC. Running Microchip's CDC class firmware at 48 MHz / 12 MIPS, the device sustains 921 600 baud on each UART while consuming roughly 15 mA active. Compared with a discrete FT232R + 8-bit MCU, this part cuts BOM cost by ~40 % and shrinks PCB area. Place a 12 MHz crystal with ±50 ppm tolerance to meet USB Full-Speed jitter specs, and route the 90 Ω D+/D- pair directly to the USB-B connector without stubs.
Recommended
USB HID Peripheral (Keyboard / Mouse / Gamepad)
HID-class USB devices demand low latency and reliable enumeration - both of which the PIC18LF2458T-I/SO delivers via its hardware USB SIE and 12 MIPS 8-bit core. At a 1 ms USB poll rate, the device has roughly 12 000 instruction cycles per report, more than enough for matrix-scanning a 16×8 keyboard or 2000 DPI optical sensor data. Its 24 KB Flash fits full HID report descriptors, multi-layer bootmaps, and bootloader space; 2 KB SRAM holds the key rollover buffer. Compared with V-USB bit-banged AVR solutions, the hardware SIE eliminates 30-40 % firmware complexity and improves EMC emissions by 6-10 dB.
Recommended
Industrial Sensor with USB Diagnostics Port
For industrial 4-20 mA loop-powered sensors, the PIC18LF2458T-I/SO serves as both the signal-conditioning MCU and the USB diagnostics interface for field calibration. The 12-bit, 10-channel ADC samples thermocouple / RTD / 4-20 mA inputs with ±1 LSB INL; the USB port streams live data to a host PC running the calibration tool at full-speed 12 Mbps. With nanoWatt XLP deep-sleep drawing <1 µA, battery-powered versions last 5-10 years on a single AA cell. The wide 2.0-5.5 V VDD tolerates industrial 24 V rails through a low-dropout regulator.
Recommended
Capacitive-Touch Front Panel Controller
The PIC18LF2458T-I/SO pairs Microchip's mTouch capacitive-sensing firmware with the on-chip 12-bit ADC and CTMU (Charge Time Measurement Unit) to scan up to 16 touch pads while reporting events over USB. At 48 MHz, each pad scan completes in ~200 µs, allowing a 16-pad panel to refresh at >300 Hz - well above the 100 Hz threshold for responsive sliders. The internal USB pull-up enables bus-powered designs without external 5 V; 2 KB SRAM holds gesture state. Designers can migrate to the 32 KB PIC18F2550T-I/SO without code changes if their UI grows.
Recommended
Educational / Maker USB Development Platform
Universities and makers favor the PIC18LF2458T-I/SO because Microchip's free MPLAB X IDE, XC8 compiler, and MLA USB stack eliminate license fees while supporting PICkit 3 / 4 in-circuit debug. The 28-SOIC is hand-solderable with a fine tip, 24 GPIO pins expose 18 ADC channels and 4 PWM outputs, and 24 KB Flash fits real firmware projects such as a USB oscilloscope or logic analyser. The same USB cable that programs the device also streams data, simplifying lab setup. Compared to ATmega32U4 breakout boards, this part costs 20-30 % less and ships with a deterministic 8-bit interrupt model preferred by teaching labs.
Recommended
Low-Speed USB Data Logger
Battery-powered USB data loggers benefit from the PIC18LF2458T-I/SO's nanoWatt XLP deep-sleep (<1 µA) plus USB attach wake-up, allowing standby current below 5 µA between host queries. The 24 KB Flash stores up to 30 KB of compressed sensor records via the 2 KB SRAM buffer, while the 32 kHz secondary oscillator keeps wall-clock time within ±5 ppm. Compared with discrete RTC + MCU + USB bridge designs, this single-chip solution reduces the BOM by 4-5 components and shrinks PCB area by 60 %. The internal USB pull-up simplifies bus-powered designs that harvest 5 V from VBUS.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF2458T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF2458-I/SO | PIC18LF2455T-I/SO | PIC18F2550T-I/SO |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Core / Frequency | 8-bit PIC18F / 48 MHz | 8-bit PIC18F / 48 MHz | 8-bit PIC18F / 48 MHz | 8-bit PIC18F / 48 MHz |
| Flash | 24 KB | 24 KB | 16 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 256 B | 256 B | 256 B | 256 B |
| USB Module | FS USB SIE + internal pull-up | FS USB SIE + internal pull-up | FS USB SIE + internal pull-up | FS USB SIE + internal pull-up |
| ADC | 10-ch 12-bit | 10-ch 12-bit | 10-ch 10-bit | 10-ch 10-bit |
| VDD Range | 2.0-5.5 V | 2.0-5.5 V | 2.0-5.5 V | 4.2-5.5 V |
| Packaging | Tape & Reel | Tube | Tape & Reel | Tape & Reel |
Key Differentiators
- Larger 24 KB Flash with pin-compatible migration path (vs PIC18LF2455T-I/SO)
- Higher-performance 12-bit ADC (vs PIC18LF2455T-I/SO)
- Wider 2.0-5.5 V VDD range than F-variant siblings (vs PIC18F2550T-I/SO)
Design Notes
The PIC18LF2458T-I/SO has three VSS pins (5, 12, 25) and one VDD pin (26); all four must be soldered and decoupled to meet USB Full-Speed signalling specifications. Place a 100 nF X7R 0402 within 3 mm of the VDD pin and a 4.7 µF bulk capacitor near the VUSB pin to stabilize the internal 3.3 V USB regulator. Estimated: under USB suspend, total quiescent current should be under 2.5 mA to remain USB-compliant; nanoWatt XLP deep-sleep drops this below 1 µA when the USB cable is detached.
Route the D+ (RC5) and D- (RC4) traces as a 90 Ω differential pair with length matching better than 150 mil and no stubs. Keep the pair away from switching nodes such as the PWM outputs and oscillator traces; place a ground pour on the layer beneath. The 12 MHz crystal (or resonator) connected to OSC1/OSC2 should be located within 5 mm of the MCU with its load capacitors (typically 22 pF) tied to the same ground island. Avoid routing signal traces under the crystal to limit EMI coupling into the USB bus.
For USB Full-Speed eye-diagram compliance, add a 33 Ω series resistor on each of D+ and D- if the device-to-connector trace exceeds 25 mm, and ensure the VBUS sense line is pulled high within 100 ms of cable attach. Use an oscilloscope probe with <1 pF loading to verify rise times fall within 4-20 ns. Estimated: a properly laid-out PIC18LF2458T-I/SO board typically passes USB CV tests on first attempt, whereas poor routing requires 2-3 PCB revisions.
Do not enable the USB module when VDD is below 3.0 V - the internal 3.3 V regulator cannot drive the USB transceiver reliably, leading to enumeration failures. When migrating from PIC18LF2455 to PIC18LF2458 firmware, verify that interrupt vector offsets match because the larger Flash shifts the high-priority interrupt vector location; Microchip's MPLAB X project migration wizard handles this automatically. Always set the CONFIG1L register to HS-PLL mode (bit 4 = 1) when using the 48 MHz USB clock configuration.
Compliance Information
RoHS and REACH compliant per Microchip's material declaration. Not AEC-Q100 qualified; for automotive, choose the PIC18LF2458T-I/SO automotive-grade variant when released, or migrate to PIC18F46K50 family.
