PIC18LF27J53-I/SO - 128KB Flash USB MCU | Microchip 28-SOIC
MPN: PIC18LF27J53-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.95 | $6.95 |
| 10 | $6.32 | $63.20 |
| 100 | $5.62 | $562.00 |
| 500 | $5.07 | $2,535.00 |
| 1,000 | $4.52 | $4,520.00 |
PIC18LF27J53-I/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash), data memory (RAM), and peripherals on one silicon die. In the system hierarchy it sits below microprocessors and FPGAs but above discrete logic, and is widely used in cost-sensitive embedded products where deterministic real-time control and ultra-low standby power are required. The PIC18 J-series specifically targets USB-enabled embedded designs and ultra-low-power (nanoWatt XLP) battery applications.
Key features of the PIC18LF27J53 include a 48 MHz internal oscillator (12 MIPS instruction throughput), 128 KB self-programmable Flash, 4 KB RAM, on-board full-speed USB 2.0 device/host/OTG transceiver, a 10-bit ADC with up to 13 input channels, two analog comparators, four timers, two CCP/ECCP modules, I2C, SPI, and UART peripherals, plus deep-sleep nanoWatt XLP modes. The 28-pin SOIC (SO-28) package exposes 22 I/O pins suitable for moderately complex user interfaces and USB cable applications.
Architecturally, the PIC18LF27J53 uses an enhanced Harvard architecture with a 16-bit instruction word and 8-bit data path, allowing single-cycle execution except for branches. The integrated USB 2.0 SIE eliminates external transceiver cost, while the deep-sleep mode reduces current consumption to microamp levels for battery-powered designs.
Typical applications include USB human-interface devices (HID keyboards, mice, gamepads), USB-to-UART bridges, portable data loggers, low-power sensor nodes with USB charging, and industrial control panels. The wide 2.0V to 3.6V operating range (LF variant) suits single-cell Li-ion or 3.3V regulated supplies. With its USB capability, ample Flash, and industrial -40C to +85C operating range, the PIC18LF27J53-I/SO bridges cost-sensitive consumer designs and certified industrial systems.
When designing with this part, ensure the USB D+/D- traces are 90 ohm differential matched and the VUSB pin has a 0.47 uF decoupling capacitor per the Microchip reference schematic. Developers should also enable the PLL only after stable VDD to avoid USB enumeration failures during brown-out events.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18LF27J53-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 PIC18LF27J53-I/SO (same form factor and footprint) — differing in ADC, Core Architecture, I/O Pins, Package, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F27J53-I/SO
✅ Drop-In✓ In Stock
$3.23 / Unit
View Datasheet →PIC18LF26J53-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF27J13-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF46J53-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F46J53-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18LF27J53-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit enhanced Harvard) |
| Program Memory (Flash) | 128 KB |
| Data Memory (RAM) | 4 KB |
| CPU Speed | 48 MHz (12 MIPS) |
| Operating Voltage | 2.0 V to 3.6 V |
| I/O Pins | 22 |
| USB Controller | USB 2.0 Full-Speed Device/Host/OTG |
| ADC | 10-bit, up to 13 channels |
| Timers | 4 (8-bit/16-bit) |
| Capture/Compare/PWM | 2 CCP + 1 ECCP |
| Communication | 2x UART, 2x I2C, 2x SPI |
| Package | 28-pin SOIC (SO-28, 7.50 mm width) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Low-Power Modes | nanoWatt XLP (Deep Sleep, Sleep, Idle) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| MSL Level | 1 (Unlimited) |
PIC18LF27J53-I/SO Pin Configuration
| Pin 1 | RA2 — PORTA bit 2 / analog input AN2 |
| Pin 2 | RA3 — PORTA bit 3 / analog input AN3 / VREF+ |
| Pin 3 | RA4 — PORTA bit 4 / analog input AN4 |
| Pin 4 | RA5 — PORTA bit 5 / analog input AN5 |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RA7 — PORTA bit 7 / oscillator input |
| Pin 7 | RA6 — PORTA bit 6 / oscillator output |
| Pin 8 | RC0 — PORTC bit 0 |
| Pin 9 | RC1 — PORTC bit 1 / CCP2 |
| Pin 10 | RC2 — PORTC bit 2 / CCP1 |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | VSS — Ground reference |
| Pin 13 | RC5 — PORTC bit 5 |
| Pin 14 | RC6 — PORTC bit 6 / TX1 |
| Pin 15 | RC7 — PORTC bit 7 / RX1 |
| Pin 16 | RB0 — PORTB bit 0 / INT0 |
| Pin 17 | RB1 — PORTB bit 1 |
| Pin 18 | RB2 — PORTB bit 2 |
| Pin 19 | RB3 — PORTB bit 3 |
| Pin 20 | RB4 — PORTB bit 4 |
| Pin 21 | RB5 — PORTB bit 5 / programmer PGM |
| Pin 22 | RB6 — PORTB bit 6 / ICSP PGC |
| Pin 23 | RB7 — PORTB bit 7 / ICSP PGD |
| Pin 24 | D+ — USB D+ data line |
| Pin 25 | D- — USB D- data line |
| Pin 26 | VUSB — USB transceiver supply (decouple with 0.47 uF) |
| Pin 27 | VSS — Ground reference |
| Pin 28 | VDD — Positive supply voltage |
Typical Applications
PIC18LF27J53-I/SO is suitable for 7 applications: USB HID Keyboard and Mouse, USB-to-UART Bridge Adapter, Portable Battery Data Logger, Industrial Sensor Node with USB Diagnostics, USB Gamepad and Consumer Controller, Medical USB Tethered Device, IoT Sensor Hub with USB Provisioning.
USB HID Keyboard and Mouse
The PIC18LF27J53-I/SO is well suited for USB HID input devices because its integrated full-speed USB 2.0 SIE handles enumeration and report generation without external logic. The 128 KB Flash accommodates USB HID descriptor tables plus key-scanning firmware, while the 12 MIPS throughput easily handles debouncing and N-key rollover on a low-cost 8-bit core. Designers should route the D+/D- pair as a 90 ohm differential microstrip, place a 0.47 uF decoupling capacitor on VUSB, and use the deep-sleep nanoWatt XLP mode between key events for sub-1 uA standby. Compared to discrete USB implementations, the integrated SIE reduces BOM cost by approximately $0.30 per board.
Recommended
USB-to-UART Bridge Adapter
The PIC18LF27J53-I/SO can implement a USB-CDC to UART bridge, replacing FTDI-style cables with a single chip that costs under $5 in volume. Its 48 MHz core runs the USB CDC class driver and baud rate generator concurrently, while the dual UART peripherals support hardware flow control. The 4 KB RAM is sufficient for 64-byte CDC buffers, and the LF variant's 2.0 V minimum VDD simplifies bus-powered designs that derive 3.3 V from the USB 5 V rail through an LDO. The SO-28 package enables hand-solderable prototypes and rework-friendly field repairs.
Recommended
Portable Battery Data Logger
The PIC18LF27J53-I/SO targets portable data loggers thanks to its nanoWatt XLP deep-sleep mode drawing under 1 uA, 128 KB Flash for storing weeks of measurement records, and 10-bit ADC sampling temperature or voltage on up to 13 channels. At 2.0 V minimum VDD the device operates directly from a nearly-depleted single-cell Li-ion or two-AA alkaline stack. Wake-up from deep-sleep via the watchdog timer enables multi-month battery life on continuous sampling duty cycles below 0.1%. The SO-28 footprint exposes 22 GPIO lines for sensor multiplexing or SD card interfacing.
Recommended
Industrial Sensor Node with USB Diagnostics
For industrial sensor nodes that occasionally connect to a USB host for firmware updates or diagnostic log retrieval, the PIC18LF27J53-I/SO combines USB connectivity with the -40 C to +85 C industrial temperature range. The 12 MIPS throughput handles Modbus or CAN bridging over UART, while the integrated USB device stack enables in-field firmware upgrade via the bootloader. Compared to external USB-UART bridges, the integrated SIE saves board space and improves EMI immunity by eliminating a high-speed external interface.
Recommended
USB Gamepad and Consumer Controller
The PIC18LF27J53-I/SO supports USB gamepad and consumer controller designs where its 128 KB Flash stores HID descriptor tables, button debouncing firmware, and force-feedback or LED driver routines. With 22 GPIO pins, the controller can scan a 4x5 button matrix plus analog joystick inputs through the 10-bit ADC, all while the integrated USB SIE streams HID reports at the full 1 kHz polling rate. The deep-sleep mode between user input events extends battery life in wireless controllers.
Recommended
Medical USB Tethered Device
The PIC18LF27J53-I/SO fits USB-tethered medical peripherals such as pulse-oximeter dongles, spirometer USB sticks, or therapy-device programmers where its 10-bit ADC provides adequate resolution for sensor front-ends and its 128 KB Flash holds device firmware plus calibration constants. The 3.3 V LF variant pairs well with battery-backed medical sensors, while the integrated USB SIE simplifies IEC 60601 EMI compliance by minimizing high-speed external traces. Note that final medical certification requires FDA or CE assessment of the complete system.
Recommended
IoT Sensor Hub with USB Provisioning
The PIC18LF27J53-I/SO acts as an IoT sensor hub whose USB port is used for initial provisioning, firmware updates, or local diagnostics rather than permanent connection. Its 48 MHz CPU and rich peripheral set (UART, SPI, I2C) interface with Wi-Fi or Bluetooth modules, environmental sensors, and EEPROM storage, while the integrated USB SIE handles the maintenance channel. The nanoWatt XLP deep-sleep mode allows battery-backed IoT nodes to remain discoverable for years on a single coin cell when USB is unplugged.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF27J53-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F27J53-I/SO | PIC18LF26J53-I/SO | PIC18LF27J13-I/SO | PIC18LF46J53-I/SO | PIC18F46J53-I/SO |
|---|---|---|---|---|---|---|
| Package | 28-pin SOIC (SO-28) | 28-pin SOIC (SO-28) - same | 28-pin SOIC (SO-28) - same | 28-pin SOIC (SO-28) - same | 28-pin SOIC (SO-28) - same | 28-pin SOIC (SO-28) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 128 KB | 64 KB (-50%) | 128 KB | 64 KB (-50%) | 64 KB (-50%) |
| RAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| USB Controller | USB 2.0 Full-Speed Device/Host/OTG | USB 2.0 Full-Speed Device/Host/OTG | USB 2.0 Full-Speed Device/Host/OTG | No USB | USB 2.0 Full-Speed Device/Host/OTG | USB 2.0 Full-Speed Device/Host/OTG |
| Min Operating Voltage | 2.0 V | 2.15 V (+7.5%) | 2.0 V | 2.0 V | 2.0 V | 2.15 V (+7.5%) |
| CPU Speed | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS |
| Operating Temperature | -40 C to +85 C (Industrial) | -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 |
Key Differentiators
- Lowest minimum VDD in the 27J53 family for battery-backed designs (vs PIC18F27J53-I/SO)
- Maximum 128 KB Flash density in the 28-pin SOIC J-series (vs PIC18LF26J53-I/SO)
- Integrated full-speed USB SIE in the smallest J-series package (vs PIC18LF27J13-I/SO)
Design Notes
Route the USB D+ and D- pair as a 90 ohm differential microstrip with continuous ground reference underneath, keeping trace length under 50 mm and matching lengths within 2 mm. Place the 0.47 uF VUSB decoupling capacitor within 3 mm of the VUSB pin. Per the Microchip reference schematic, a ferrite bead on the VBUS line is recommended when the USB cable shield current would otherwise couple into the analog ADC reference.
Brown-out reset configuration must be enabled in the CONFIG2 register before USB enumeration. If VDD sags below 2.0 V during USB plug-in events, the PLL may fail to start and enumeration will hang. Add a 10 uF bulk capacitor plus 0.1 uF ceramic decoupling on each VDD pin (pins 11 and 28) to absorb inrush transients. The on-chip 3.3 V regulator requires a 10 uF low-ESR capacitor on its output even when unused.
Do not leave the ICSP pins (RB6/RB7) floating during normal operation. Either enable the internal weak pull-ups in firmware or add external 10 kohm pull-ups to VDD, because floating PGC/PGD pins can latch-up or cause spurious interrupts. The 28-pin SOIC (SO-28, 7.50 mm body) variant is preferred over SSOP for hand-soldered prototypes; verify the trailing slash suffix matches the JEDEC SO-28 outline before ordering.
Estimated: at maximum operating current of approximately 15 mA active and 3.3 V supply, power dissipation is 49.5 mW, well below thermal limits. With a typical SO-28 theta_JA of 70 C/W, the junction rises only 3.5 C above ambient, so no thermal management is required for typical USB applications. Deep-sleep operation drops quiescent current below 1 uA, eliminating thermal concerns entirely for battery-backed designs.
Compliance Information
RoHS and REACH compliance per Microchip product page. AEC-Q100 qualification not applicable for industrial-grade -I suffix parts; automotive designs require PIC18F27J53-I/SO with explicit automotive part number extension.
