PIC18LF27J53T-I/ML - 128KB Flash USB 8-bit MCU | Microchip
MPN: PIC18LF27J53T-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.84 | $5.84 |
| 10 | $5.25 | $52.50 |
| 100 | $4.67 | $467.00 |
| 500 | $4.2 | $2,100.00 |
| 1,000 | $3.74 | $3,740.00 |
PIC18LF27J53T-I/ML Overview
A microcontroller (MCU) is an integrated circuit containing a CPU core, program memory, RAM, peripherals, and I/O on a single silicon die. PIC18 microcontrollers use Microchip's enhanced Harvard RISC architecture, which separates program and data buses for higher instruction throughput. Within that hierarchy, the PIC18LF27J53 belongs to the XLP (eXtreme Low Power) "J53" sub-family - microcontrollers with USB peripherals optimized for portable and consumer applications. Typical J53 devices run from 2.0V to 3.6V and incorporate nanoWatt XLP sleep modes for battery-friendly operation.
Key features of the PIC18LF27J53T-I/ML include the integrated USB 2.0 full-speed transceiver and SIE (which eliminates the need for an external PHY), 128 KB self-programmable flash with 1 KB of EEPROM endurance data, and 22 general-purpose I/O pins with interrupt-on-change capability. Additional integrated peripherals include two analog comparators, a 12-bit ADC with up to 10 channels, an RTCC, and four 16-bit timers. The "-I" suffix denotes the industrial -40C to +85C operating temperature range.
The device uses a 16-bit modified Harvard RISC core with an 8-level hardware stack and 31-level software stack, delivering 12 MIPS performance at 48 MHz. Internal oscillator options include a precision 8 MHz HFINTOSC and a 31 kHz LFINTOSC, simplifying designs by eliminating external crystals in many cases. The QFN-28 package's exposed pad provides a low thermal resistance path and must be soldered to the PCB ground plane for reliable operation.
Typical applications for this part include USB HID peripherals, USB-to-UART bridges, low-power data loggers, sensor hubs, consumer electronics with USB charging interfaces, and human-interface devices (keyboards, mice, game controllers). Industrial uses include battery-backed monitoring nodes and portable instrumentation. The part is also suitable for educational development boards and rapid prototyping because of its combination of USB, ADC, and serial peripherals.
When designing with the PIC18LF27J53T-I/ML, pay attention to the 3.3V rail: USB signaling and core logic both require a regulated 3.3V supply, and the LF variant tolerates down to 2.0V when USB is disabled. The exposed thermal pad must be soldered to the ground plane to keep the junction within safe limits, and the internal oscillator accuracy may require calibration for USB compliance at low temperatures.
This page consolidates verified distributor pricing, drop-in alternatives from Microchip's PIC18LF27J53 family and other pin-compatible 8-bit MCUs, and practical design notes that complement the manufacturer datasheet - synthesized specifically for embedded engineers selecting a USB-capable low-power MCU in QFN-28.
Drop-in alternatives for PIC18LF27J53T-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 PIC18LF27J53T-I/ML (same form factor and footprint) — differing in ADC, Operating Temperature, Package, Timers, Communication.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF27J53-I/ML
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.3 / Unit
View Datasheet →PIC18F27J53T-I/ML
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.1 / Unit
View Datasheet →PIC18LF26J53-I/ML
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.35 / Unit
View Datasheet →PIC18LF27J53-I/SO
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.52 / Unit
View Datasheet →PIC18LF25J10-I/ML
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.62 / Unit
View Datasheet →PIC18LF27J53T-I/ML Maximum Ratings & Electrical Characteristics
| Family | PIC18LFXXJ53 |
| Core | PIC 8-bit enhanced Harvard RISC |
| Program Memory (Flash) | 128 KB (64K x 16) |
| RAM | 3.8 KB |
| Maximum CPU Speed | 48 MHz (12 MIPS) |
| Operating Voltage Range | 2.0 V to 3.6 V |
| Number of I/O Pins | 22 |
| USB Interface | USB 2.0 Full-Speed with on-chip transceiver |
| ADC | 12-bit, up to 10 channels |
| Timers | 4 x 16-bit |
| Comparators | 2 analog comparators |
| Serial Interfaces | 1x SPI, 1x I2C, 1x USART (with LIN) |
| Internal Oscillator | 8 MHz HFINTOSC + 31 kHz LFINTOSC |
| Package | 28-QFN (6x6 mm) with exposed pad |
| Operating Temperature | -40C to +85C (industrial, -I suffix) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC18LF27J53T-I/ML Pin Configuration
| Pin 1 | RA0/AN0 — Digital I/O RA0 / ADC analog input AN0 |
| Pin 2 | RA1/AN1 — Digital I/O RA1 / ADC analog input AN1 |
| Pin 3 | RA2/AN2/VREF- — Digital I/O RA2 / ADC AN2 / negative voltage reference |
| Pin 4 | RA3/AN3/VREF+ — Digital I/O RA3 / ADC AN3 / positive voltage reference |
| Pin 5 | RA4/AN4 — Digital I/O RA4 / ADC analog input AN4 |
| Pin 6 | RA5/AN5 — Digital I/O RA5 / ADC analog input AN5 |
| Pin 7 | RA6 — Digital I/O RA6 |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| Pin 10 | OSC2/CLKOUT — Crystal oscillator output / clock output |
| Pin 11 | RC0 — Digital I/O RC0 |
| Pin 12 | RC1 — Digital I/O RC1 |
| Pin 13 | RC2 — Digital I/O RC2 |
| Pin 14 | RC3 — Digital I/O RC3 |
| Pin 15 | RC4/D-/VMO — Digital I/O RC4 / USB D- / USB VMO output |
| Pin 16 | RC5/D+/VPO — Digital I/O RC5 / USB D+ / USB VPO output |
| Pin 17 | RC6 — Digital I/O RC6 / USART TX |
| Pin 18 | RC7 — Digital I/O RC7 / USART RX |
| Pin 19 | VUSB — USB transceiver voltage supply |
| Pin 20 | RB0 — Digital I/O RB0 |
| Pin 21 | RB1 — Digital I/O RB1 |
| Pin 22 | RB2 — Digital I/O RB2 |
| Pin 23 | RB3 — Digital I/O RB3 |
| Pin 24 | RB4 — Digital I/O RB4 / interrupt-on-change |
| Pin 25 | RB5 — Digital I/O RB5 / interrupt-on-change |
| Pin 26 | RB6/PGC — Digital I/O RB6 / ICSP programming clock |
| Pin 27 | RB7/PGD — Digital I/O RB7 / ICSP programming data |
| Pin 28 | VDD — Positive supply voltage (2.0V to 3.6V) |
Typical Applications
PIC18LF27J53T-I/ML is suitable for 6 applications: USB HID Peripheral Devices, USB-to-UART/I2C Bridge Dongles, Battery-Powered Sensor Data Loggers, Industrial USB Interface Modules, Consumer Electronics with USB Charging, Educational Development Boards.
USB HID Peripheral Devices
The PIC18LF27J53T-I/ML is purpose-built for USB HID applications because it integrates a USB 2.0 full-speed transceiver and SIE on-chip, eliminating the need for an external USB PHY. With 128 KB flash it can host custom HID report descriptors plus Microchip's free USB stack, and 3.8 KB RAM handles multi-endpoint buffers. At 48 MHz (12 MIPS), the CPU can sustain HID polling rates up to 1 kHz without bottlenecking. Compared to MCUs requiring an external PHY, this part reduces BOM by 2-3 components and cuts PCB area by approximately 30 percent - critical for compact input devices such as keyboards, mice, and game controllers.
Recommended
USB-to-UART/I2C Bridge Dongles
USB-to-serial bridge dongles benefit from the PIC18LF27J53T-I/ML's integrated USB transceiver, 128 KB flash for USB CDC stack plus custom vendor commands, and 3.8 KB RAM for HID-to-serial mode-switching logic. The device's 48 MHz operation supports sustained 1 Mbaud UART throughput, while the 2.0V to 3.6V core allows direct 3.3V battery or USB-powered designs. Compared to dedicated bridge chips like the MCP2221A, this MCU offers 10-20x more flash for vendor-defined commands. Engineers can also implement I2C master/slave bridging with the integrated MSSP peripheral.
Recommended
Battery-Powered Sensor Data Loggers
The PIC18LF27J53T-I/ML is well-suited for battery-powered data loggers thanks to its LF-designated 2.0V to 3.6V operation, nanoWatt XLP sleep modes drawing under 100 nA, and 12-bit ADC with up to 10 channels for analog sensor scanning. The 128 KB flash supports multi-week log formats and offline processing. With 3.8 KB RAM, it can buffer several hundred samples before flush. The QFN-28 package's exposed pad provides thermal dissipation for ADC-intensive sampling. Engineers commonly use sleep-mode duty cycling with the internal 31 kHz LFINTOSC to extend battery life beyond 12 months on a single coin cell.
Recommended
Industrial USB Interface Modules
Factory automation and process control USB interface modules benefit from the PIC18LF27J53T-I/ML's industrial -40C to +85C operating range, USB 2.0 full-speed compliance, and 128 KB flash for vendor-specific protocols. The 12-bit ADC provides local analog monitoring alongside digital USB communication. Compared to industrial-only HMI controllers, this part offers PC-side USB connectivity at consumer-grade pricing. Its 22 GPIO pins handle discrete signaling and status LEDs, while serial peripherals support RS-485 transceivers for legacy industrial fieldbus connections.
Recommended
Consumer Electronics with USB Charging
USB-charging consumer devices such as power banks, electronic toys, and personal care appliances use the PIC18LF27J53T-I/ML for charge-status indication via USB CDC, button input handling on 22 GPIO pins, and ADC monitoring of battery voltage. The 48 MHz CPU handles USB enumeration plus PWM LED drivers for state indication. Compared to pure analog chargers, this MCU-based approach offers user-customizable LED patterns and USB data exchange for firmware updates via Microchip's bootloader.
Recommended
Educational Development Boards
The PIC18LF27J53T-I/ML is widely used in hobbyist and educational development platforms because it combines USB device support, ample 128 KB flash for full-feature firmware, 22 GPIO pins for breadboard-friendly prototyping, and Microchip's free MPLAB X IDE toolchain. Hobbyists benefit from the integrated USB bootloader which avoids external programmers, while students learn 8-bit MCU fundamentals. Compared to bare PIC12/PIC16 parts, the LF27J53 offers enough peripherals (USB, ADC, multiple timers) to explore embedded topics in a single chip.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF27J53T-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF27J53-I/ML | PIC18F27J53T-I/ML | PIC18LF26J53-I/ML | PIC18LF25J10-I/ML |
|---|---|---|---|---|---|
| Package | 28-QFN (6x6 mm) | 28-QFN (6x6 mm) - same | 28-QFN (6x6 mm) - same | 28-QFN (6x6 mm) - same | 28-QFN (6x6 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 128 KB | 128 KB | 64 KB | 32 KB |
| RAM | 3.8 KB | 3.8 KB | 3.8 KB | 3.6 KB | 1.5 KB |
| USB Interface | USB 2.0 Full-Speed integrated | USB 2.0 Full-Speed integrated | USB 2.0 Full-Speed integrated | USB 2.0 Full-Speed integrated | No USB |
| Operating Voltage | 2.0V to 3.6V | 2.0V to 3.6V | 2.0V to 3.6V | 2.0V to 3.6V | 2.0V to 3.6V |
| Maximum CPU Speed | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 40 MHz |
| I/O Pins | 22 | 22 | 22 | 22 | 22 |
| ADC | 12-bit, 10 channels | 12-bit, 10 channels | 12-bit, 10 channels | 12-bit, 10 channels | 10-bit, 13 channels |
| Automotive Grade | No (-I industrial only) | No | No | No | No |
Key Differentiators
- Integrated USB 2.0 full-speed transceiver and SIE on-chip (vs PIC18LF25J10-I/ML)
- Doubled flash memory versus 26J53 sibling (vs PIC18LF26J53-I/ML)
- LF low-voltage designation extends battery operation (vs PIC18F27J53T-I/ML)
Design Notes
The PIC18LF27J53T-I/ML operates from 2.0V to 3.6V; USB signaling requires the upper portion of the range (typically 3.0V to 3.6V) to maintain D+/D- logic levels within USB 2.0 spec. Place a 100 nF decoupling capacitor as close as possible to the VDD pin and a bulk 10 uF tantalum or ceramic on the supply rail. The VUSB pin should also have its own 100 nF decoupling. For USB-powered designs, ensure VBUS sensing circuitry shuts down the regulator when not connected.
The 28-QFN exposed thermal pad must be soldered to the PCB ground plane for proper thermal dissipation and electrical performance. Without it, the device may exceed safe junction temperature under sustained ADC and USB operation. Use at least 6-8 thermal vias (0.3 mm drill) connecting the exposed pad to internal ground planes. USB D+/D- traces should be routed as a 90-ohm differential pair, kept under 50 mm to minimize EMI and signal integrity issues.
Do not skip configuring the CONFIG3L register's VREG bit if you plan to use the internal 3.3V USB voltage regulator - omitting it leaves USB signals at logic levels outside spec. When migrating from PIC18F to PIC18LF variants, verify your code initializes the LFINTOSC correctly because low-voltage startup behavior differs. Finally, always check the PIC18F47J53 Family Silicon Errata document before locking in firmware - silicon rev A1 had known issues with ADC sampling accuracy under specific conditions.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature range -40C to +85C (I-suffix). Not AEC-Q100 qualified - automotive designs should look at PIC18F25K83 or PIC18F46K80 series with Q1 suffix.
