PIC18F27J53-I/SO - 8-Bit 48MHz USB MCU 128KB Flash 28-SOIC | Microchip
MPN: PIC18F27J53-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.06 | $5.06 |
| 10 | $4.55 | $45.50 |
| 100 | $4.04 | $404.00 |
| 500 | $3.63 | $1,815.00 |
| 1,000 | $3.23 | $3,230.00 |
PIC18F27J53-I/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory (typically Flash), working RAM, and peripherals such as timers, ADCs and communication controllers on one die. The PIC18 family implements an enhanced Harvard RISC architecture with 16-bit instructions, sitting within the broader taxonomy 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. The 18J sub-family targets low-power and USB-connected designs in the PIC18 portfolio.
Key features include nanoWatt XLP deep-sleep operation for battery-powered applications, 25 general-purpose I/O pins, a 12-bit ADC with up to 10 channels, two analog comparators, two CCP/ECCP modules, and a real-time clock with calendar. The integrated USB 2.0 full-speed transceiver includes an on-chip voltage regulator and dedicated PLL, removing the need for external USB components.
Architecturally, the PIC18F27J53 uses a modified Harvard bus with separate program and data paths, single-cycle hardware multiply, and an 8x8 hardware multiplier that accelerates math-intensive USB and sensor routines. Its 128KB self-programmable Flash supports ICSP (In-Circuit Serial Programming) and runtime firmware updates, while the 4KB RAM and 1KB EEPROM-style data storage provide scratch and non-volatile parameter space.
Typical applications include USB human-interface devices (HIDs), embedded data loggers with USB connectivity, industrial sensor nodes, low-cost instrumentation, and consumer appliances that need a single-chip USB interface. The PIC18F27J53-I/SO is the 28-SOIC industrial-temperature variant (-40C to +85C) of the family.
When designing with this part, observe the dual-rail voltage architecture: the I/O and core domain runs from VDDCORE (typically 2.0-3.6V regulated from VBUS or VBAT), while the USB transceiver domain requires 3.0-3.6V on VUSB. Always bulk-decouple each supply pin with at least 0.1uF ceramic capacitance placed within 3 mm of the pin.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that complement - not duplicate - the manufacturer datasheet, giving procurement and embedded engineers an actionable decision matrix in one view.
Drop-in alternatives for PIC18F27J53-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 PIC18F27J53-I/SO (same form factor and footprint) — differing in ADC, USB, Package, Series, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F27J53T-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F26J53-I/SO
✅ Drop-In✓ In Stock
$2.85 / Unit
View Datasheet →PIC18F27J53-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F26J53-I/SS
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.98 / Unit
View Datasheet →PIC18F27J53-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit Harvard RISC) |
| Series | PIC18 J-series, nanoWatt XLP |
| Program Memory (Flash) | 128 KB (64K x 16) |
| RAM | 4 KB |
| CPU Clock Speed | 48 MHz (internal, 12 MIPS) |
| Instruction Cycle | 83 ns (4 FOSC periods) |
| Operating Voltage (VDDCORE) | 2.0 V to 3.6 V |
| I/O Pins | 25 |
| ADC | 12-bit, 10 channels |
| USB | USB 2.0 Full-Speed (12 Mbps), on-chip transceiver |
| Timers | Five 16-bit timers/counters |
| CCP/ECCP Modules | 2 CCP / 1 ECCP |
| Comparators | 2 analog comparators |
| RTCC | Yes (Real-Time Clock and Calendar) |
| Package | 28-pin SOIC (SO) |
| Operating Temperature | -40 C to +85 C (industrial) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited) |
| RoHS Status | Compliant |
PIC18F27J53-I/SO Pin Configuration
| Pin 1 | RA0/AN0 — Digital I/O / analog input channel 0 |
| Pin 2 | RA1/AN1 — Digital I/O / analog input channel 1 |
| Pin 3 | RA2/AN2/VREF- — Digital I/O / analog input 2 / negative ADC reference |
| Pin 4 | RA3/AN3/VREF+ — Digital I/O / analog input 3 / positive ADC reference |
| Pin 5 | RA4/AN4 — Digital I/O / analog input 4 / timer clock input |
| Pin 6 | RA5/AN5 — Digital I/O / analog input 5 |
| Pin 7 | VDD — Positive supply (2.0V to 3.6V) |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKI/RA7 — Crystal/clock input or digital I/O |
| Pin 10 | OSC2/CLKO/RA6 — Crystal/clock output or digital I/O |
| Pin 11 | RC0/SOSCO — Digital I/O / secondary oscillator output |
| Pin 12 | RC1/SOSCI — Digital I/O / secondary oscillator input |
| Pin 13 | RC2/CCP1 — Digital I/O / Capture/Compare/PWM 1 |
| Pin 14 | VUSB — USB transceiver supply (3.0V to 3.6V) |
| Pin 15 | RC4/D-/VM — USB D- line / digital I/O |
| Pin 16 | RC5/D+/VP — USB D+ line / digital I/O |
| Pin 17 | RC6 — Digital I/O / UART TX |
| Pin 18 | RC7 — Digital I/O / UART RX |
| Pin 19 | VSS — Ground reference (USB domain) |
| Pin 20 | VDD — Positive supply (USB domain) |
| Pin 21 | RB0/AN12 — Digital I/O / analog input 12 / interrupt-on-change |
| Pin 22 | RB1/AN10 — Digital I/O / analog input 10 |
| Pin 23 | RB2/AN8 — Digital I/O / analog input 8 |
| Pin 24 | RB3/AN9 — Digital I/O / analog input 9 / I2C SCL |
| Pin 25 | RB4/AN11 — Digital I/O / analog input 11 / I2C SDA |
| Pin 26 | RB5/AN13 — Digital I/O / analog input 13 |
| Pin 27 | RB6/ICSPCLK — Digital I/O / ICSP clock / in-circuit debugger |
| Pin 28 | RB7/ICSPDAT — Digital I/O / ICSP data / in-circuit debugger |
Typical Applications
PIC18F27J53-I/SO is suitable for 6 applications: USB Human Interface Device (HID), Industrial Sensor Data Logger, USB-to-UART Bridge / Virtual COM Port, Consumer Appliance Control Panel, USB Medical Data Acquisition Pod, Embedded IoT Sensor Node with USB Provisioning.
USB Human Interface Device (HID)
The PIC18F27J53-I/SO is a strong match for USB HID peripherals such as keyboards, mice, custom joysticks, and barcode scanners. Its on-chip USB 2.0 full-speed transceiver with internal pull-up and dedicated PLL eliminates an external PHY, reducing BOM count by typically 3-5 components. With 48 MHz operation and 12 MIPS throughput, the MCU easily handles HID class descriptor parsing and report generation while leaving cycles for debouncing, LED handling, and capacitive-touch scanning on the 12-bit ADC. The 128 KB Flash accommodates rich firmware stacks including the Microchip USB framework, while 4 KB RAM buffers incoming HID reports without dropping packets.
Recommended
Industrial Sensor Data Logger
The PIC18F27J53-I/SO fits industrial sensor logging designs that need on-board USB for configuration and data retrieval. The 12-bit ADC with up to 10 input channels digitizes analog sensor signals, while the 128 KB Flash buffers up to 50,000 sample logs with timestamps from the integrated RTCC. NanoWatt XLP deep-sleep mode drops current to sub-microamp levels between measurements, suiting battery or energy-harvested installations. USB enables engineers to plug into a PC and dump logs as a mass-storage device without needing an external programmer. The 28-SOIC package handles -40 C to +85 C industrial environments typical of factory floors.
Recommended
USB-to-UART Bridge / Virtual COM Port
Using the on-chip USB full-speed transceiver and the integrated UART, the PIC18F27J53-I/SO is well suited to low-cost USB-to-serial bridges that replace legacy FTDI cables. Its 48 MHz CPU and 4 KB RAM run the Microchip CDC class driver while sustaining 921,600 bps UART throughput with negligible CPU overhead. The 28-SOIC industrial variant supports commercial cable assemblies and embedded modules that need -40 C to +85 C operation. Bus-powered designs benefit from the internal 3.3 V regulator that derives VDDCORE from VBUS, removing the need for an external LDO.
Recommended
Consumer Appliance Control Panel
The PIC18F27J53-I/SO drives consumer appliance front-panel controllers that combine a few buttons, LEDs, a small display, and optional USB service-port diagnostics. The 25 GPIO pins handle keypads, indicator LEDs, character-LCD data buses, and rotary encoders. With 12 MIPS the MCU scans inputs, drives PWM-controlled LED backlights via the ECCP module, and services USB updates from a service tool without code impact. The 28-SOIC package reflows cleanly on standard SMT lines, and the -40 C to +85 C industrial range covers kitchen and laundry environments with margin.
Recommended
USB Medical Data Acquisition Pod
The PIC18F27J53-I/SO suits compact USB-connected medical pods for personal health monitoring - e.g., pulse oximeter front-ends, single-channel ECG loggers, or spirometer interfaces. The integrated 12-bit ADC samples analog front-end signals at up to 200 ksps aggregate, sufficient for ECG bandwidth up to 40 kHz. USB full-speed with suspend current below 2.5 mA enables bus-powered operation that meets IEC 60601-1 energy limits for patient-connected devices. NanoWatt XLP deep sleep extends battery runtime when the pod is unplugged from the host. The 128 KB Flash stores local firmware calibration tables and patient identifiers.
Recommended
Embedded IoT Sensor Node with USB Provisioning
The PIC18F27J53-I/SO works as the brains of an IoT sensor node that uses USB for first-time provisioning, firmware updates, and occasional diagnostics rather than as the main wireless link. The on-chip USB device stack supports DFU class for in-field firmware upgrades over USB without external programmers. With 48 MHz and ECCP available, the MCU can also generate IR, drive servo outputs, or run a stepping motor interface in addition to reading sensors via the 12-bit ADC. The 28-SOIC package is friendly to hand-soldering during prototyping while still reflowing on automated lines in production.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F27J53-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F27J53T-I/SO | PIC18F26J53-I/SO | PIC18F27J53-I/SS | PIC18F26J53-I/SS |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (SO) | 28-SOIC (SO) - same | 28-SOIC (SO) - same | 28-SSOP (SS) - narrower body | 28-SOIC (SO) |
| Flash | 128 KB | 128 KB | 64 KB (-50%) | 128 KB | 64 KB (-50%) |
| RAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| CPU Speed | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS |
| USB Transceiver | Yes (Full-Speed) | Yes (Full-Speed) | Yes (Full-Speed) | Yes (Full-Speed) | Yes (Full-Speed) |
| I/O Pins | 25 | 25 | 25 | 25 | 25 |
| 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 |
Key Differentiators
- Only 28-SOIC part in PIC18F27J53 family with industrial temperature rating (vs PIC18F27J53T-I/SO)
- Double the Flash memory vs the 26J53 sibling (vs PIC18F26J53-I/SO)
- Surface-mount SOIC package vs through-hole SPDIP (vs PIC18F27J53-I/SP)
Design Notes
The PIC18F27J53-I/SO has separate supply domains: VDDCORE (typically 2.5V from the internal regulator) and VUSB (3.0-3.6V). Bulk-decouple VDD with 0.1 uF X7R ceramic within 3 mm of the pin, and place a 10 uF bulk cap on VUSB if the USB bus is the power source. The internal 3.3V regulator derives VDDCORE from VDD or VBUS depending on configuration, eliminating an external LDO in bus-powered designs.
Route the USB D+ and D+ traces as a 90 ohm differential pair with matched length and continuous ground reference. Keep the pair length under 50 mm and avoid splits in the underlying ground plane. Place the VUSB decoupling capacitor adjacent to pin 14 with the shortest possible trace. For SOIC-28 layout, allow 0.05 inch clearance between SOIC and SSOP footprints to permit package swaps during assembly.
Do not assume the PIC18F27J53 runs from 5V - the I/O domain is 3.6V max and logic-level translation is required when interfacing to 5V peripherals. Avoid tying RC4/RC5 to anything other than the USB D-/D+ lines - these pins are bonded to the on-chip USB transceiver and lose general I/O capability when USB is enabled. Always program the CONFIG3L fuse to select the correct USB voltage regulator source (VBUS or internal LDO).
The PIC18F27J53-I/SO draws roughly 10 mA active at 48 MHz and below 1 uA in deep sleep. Estimated: total dissipation at 3.3V x 10 mA = 33 mW worst case. The 28-SOIC package provides adequate thermal margin for these loads; no heatsink is required. In tight enclosures without airflow, derate active-mode duty cycle or invoke nanoWatt XLP idle modes to keep junction temperature well below the 150 C maximum.
Compliance Information
RoHS and lead-free per Microchip product page. No AEC-Q100 automotive qualification - for automotive-grade PIC18F J-series use the J53-I/SO 021 (automotive) suffix or PIC18F46J53 family automotive variants. Halogen-free per Microchip material declaration.
