PIC18F26J53-I/SO - 48MHz 8-bit USB MCU 64KB Flash | Microchip
MPN: PIC18F26J53-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.42 | $4.42 |
| 10 | $3.95 | $39.50 |
| 100 | $3.52 | $352.00 |
| 500 | $3.18 | $1,590.00 |
| 1,000 | $2.85 | $2,850.00 |
PIC18F26J53-I/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, RAM, and peripheral interfaces. The PIC18F family uses Microchip's enhanced 8-bit modified Harvard architecture, separating program and data memory buses for predictable single-cycle instruction execution. The 'J' series specifically adds native USB 2.0 full-speed transceivers, making it the entry-level choice for cost-sensitive embedded USB designs. Within the broader taxonomy, the PIC18F26J53 sits in the hierarchy: 8-bit MCU -> PIC18 family -> PIC18 J-series -> USB-enabled low-power MCUs -> semiconductor.
Key features include 10-channel 10/12-bit ADC, multiple serial interfaces (UART, SPI, I2C), 25 I/O pins, and dedicated DMA channels that offload data movement between peripherals and memory. The 64KB Flash supports self-programming for in-field firmware updates via the bootloader, while 3.8KB of RAM provides ample workspace for USB descriptors and protocol stacks. Hardware CTMU (Charge Time Measurement Unit) enables touch sensing and precise time-of-flight measurements.
Typical applications include USB HID peripherals (keyboards, mice, custom input devices), USB-to-UART bridges, low-cost data loggers with USB charging, medical sensor interfaces, and consumer electronics requiring battery-friendly operation. The 28-SOIC package provides hand-solderable through-hole-like accessibility for prototypes while remaining compatible with automated SMT lines.
When designing with this MCU, pay attention to the unified 2.0V-3.6V supply range and remember that the PIC18 J-series uses a 3.3V nominal core with integrated 3.3V USB transceiver, eliminating the need for external level shifters on the USB bus. External crystal selection affects both USB clock accuracy and CPU speed, so use a 48MHz fundamental-mode crystal or the internal PLL for full-speed USB compliance.
This page synthesizes distributor pricing, drop-in SOIC-28 alternatives, and practical design notes not consolidated on the manufacturer datasheet or individual distributor pages.
Drop-in alternatives for PIC18F26J53-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 PIC18F26J53-I/SO (same form factor and footprint) — differing in ADC, Operating Temperature, Package, RAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F46J53-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F25J50-I/SO
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →PIC18F26J13-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F46J53-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F47J53-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F26J53-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 8-bit Enhanced |
| Program Memory (Flash) | 64 KB (32K x 16) |
| RAM | 3.8 KB |
| Operating Frequency | 48 MHz (max, internal oscillator) |
| Throughput | 12 MIPS |
| Supply Voltage (Vdd) | 2.0 V to 3.6 V |
| I/O Pins | 25 |
| ADC | 10 channels, 10/12-bit |
| USB | USB 2.0 Full-Speed (12 Mbps) integrated transceiver |
| Communication Interfaces | UART, SPI, I2C |
| Package | 28-pin SOIC (SO) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| DMA Channels | Yes |
| Low-Power Mode | nanoWatt XLP deep sleep |
| RoHS Status | Compliant |
PIC18F26J53-I/SO Pin Configuration
| Pin 1 | RA2 — Digital I/O / analog input AN2 |
| Pin 2 | RA3 — Digital I/O / analog input AN3 / Vref+ |
| Pin 3 | RA4 — Digital I/O / analog input AN4 |
| Pin 4 | RA5 — Digital I/O / analog input AN5 |
| Pin 5 | VDD — Positive supply voltage |
| Pin 6 | VSS — Ground reference |
| Pin 7 | RA7 — Digital I/O / oscillator input |
| Pin 8 | RA6 — Digital I/O / oscillator output |
| Pin 9 | RC1 — Digital I/O / analog input AN15 |
| Pin 10 | RC2 — Digital I/O / analog input AN14 |
| Pin 11 | RC3 — Digital I/O / SPI/I2C clock |
| Pin 12 | RC4 — Digital I/O / SPI/I2C data |
| Pin 13 | RC5 — Digital I/O / analog input AN13 |
| Pin 14 | RC6 — Digital I/O / UART TX |
| Pin 15 | RC7 — Digital I/O / UART RX |
| Pin 16 | RB0 — Digital I/O / analog input AN12 / interrupt-on-change |
| Pin 17 | RB1 — Digital I/O / analog input AN10 |
| Pin 18 | RB2 — Digital I/O / analog input AN8 |
| Pin 19 | RB3 — Digital I/O / analog input AN9 |
| Pin 20 | RB4 — Digital I/O / interrupt-on-change |
| Pin 21 | RB5 — Digital I/O / interrupt-on-change |
| Pin 22 | RB6 — Digital I/O / ICSP clock |
| Pin 23 | RB7 — Digital I/O / ICSP data |
| Pin 24 | VUSB — USB 3.3V regulator output (bypass capacitor required) |
| Pin 25 | D- — USB D- differential data line |
| Pin 26 | D+ — USB D+ differential data line |
| Pin 27 | RA0 — Digital I/O / analog input AN0 |
| Pin 28 | RA1 — Digital I/O / analog input AN1 |
Typical Applications
PIC18F26J53-I/SO is suitable for 7 applications: USB HID Peripherals, USB-to-UART Bridge, Portable Data Logger, Touch-Sensing User Interface, Industrial Sensor Interface, USB Charging and Power Bank Controller, Educational and Maker Development Platform.
USB HID Peripherals
The PIC18F26J53-I/SO is well suited for USB Human Interface Device (HID) class peripherals such as custom keyboards, mice, game controllers, and industrial input panels. The integrated USB 2.0 full-speed transceiver eliminates external interface ICs and supports 1.5 Mbps Low-Speed and 12 Mbps Full-Speed modes automatically. The 64KB Flash accommodates the HID descriptor stack plus custom report protocols, while 3.8KB RAM holds endpoint buffers and HID report definitions. Compared to UART-based MCUs that need an external FTDI bridge, the integrated USB saves $1-2 in BOM and reduces PCB area. The nanoWatt XLP deep sleep mode keeps idle peripherals below 100nA, ideal for bus-powered USB devices relying on suspend current limits.
Recommended
USB-to-UART Bridge
The PIC18F26J53-I/SO serves as a USB CDC class bridge that converts USB to UART, SPI, or I2C for legacy equipment modernization. The integrated USB transceiver handles the 12 Mbps USB signaling while the UART peripheral runs up to 5 Mbps, and the DMA channels offload byte movement between USB endpoints and UART buffers - reducing CPU overhead below 5%. Designers can implement a CDC-to-UART bridge in 8-12KB of Flash, leaving room for command parsing or protocol translation. The 2.0V-3.6V supply range is compatible with both 3.3V and lower-voltage logic. Industrial temperature rating (-40C to +85C) supports factory floor and outdoor instrumentation.
Recommended
Portable Data Logger
The PIC18F26J53-I/SO's combination of 64KB Flash, 12-bit ADC, and nanoWatt XLP low-power modes makes it ideal for battery-powered data loggers. The 10-channel ADC samples sensor inputs at up to 200 ksps with 12-bit resolution, sufficient for temperature, voltage, and pressure logging applications. Deep sleep current below 100nA extends battery life to multi-year operation in periodic sampling modes (e.g., wake every 10 seconds, sample, return to sleep). USB connectivity enables direct battery charging and data download via the same connector, eliminating a separate programming header. The 28-SOIC package is hand-solderable for prototypes and supports 0402-passives PCB designs.
Recommended
Touch-Sensing User Interface
The PIC18F26J53-I/SO integrates Microchip's CTMU (Charge Time Measurement Unit), which enables capacitive touch sensing on up to 25 I/O pins without an external touch controller IC. Each button or slider requires only a copper pad and a few external components, dramatically reducing BOM cost for human-machine interface (HMI) panels. The 48MHz CPU processes touch scans in under 100 microseconds per channel, supporting 10+ button panels at 50 Hz refresh rates. Combined with USB, the same MCU handles both touch input and host communication - perfect for industrial control panels, appliance interfaces, and USB HID touch controllers.
Recommended
Industrial Sensor Interface
The PIC18F26J53-I/SO serves industrial sensor aggregation nodes that report measurements over USB to a host PC or PLC. The 12-bit ADC with 10 channels handles multiple analog sensors simultaneously, while SPI and I2C peripherals connect to digital sensors and EEPROMs for calibration data. Industrial temperature rating (-40C to +85C) ensures operation in factory environments, and the wide 2.0V-3.6V supply tolerates noisy 3.3V rails from industrial power supplies. The 64KB Flash stores Modbus, custom protocols, or USB vendor-class descriptors for sensor reporting. Designers benefit from Microchip's free USB stack and Harmony framework that accelerates development.
Recommended
USB Charging and Power Bank Controller
The PIC18F26J53-I/SO can act as a smart USB charging controller for power banks, USB hubs, and battery chargers. The integrated USB transceiver negotiates with host devices for current requests (USB BC 1.2), and the ADC monitors battery voltage and current for accurate state-of-charge calculations. The 64KB Flash supports custom charging profiles for Li-ion, LiPo, and NiMH chemistries. Deep sleep mode below 100nA keeps idle power draw negligible - critical for shelf-life. The 28-SOIC footprint fits compact USB stick form factors used in portable chargers.
Recommended
Educational and Maker Development Platform
The PIC18F26J53-I/SO is widely supported in educational and maker contexts thanks to its integrated USB, in-circuit debugging, and free MPLAB X IDE with XC8 compiler. The 28-SOIC package is breadboard-compatible with breakout boards, and the USB stack ships as royalty-free source code. The 48MHz CPU, 64KB Flash, and rich peripheral set allow students to progress from basic GPIO exercises to USB communication, ADC sampling, and PWM motor control within a single chip. Microchip's PICkit programmer/debugger works out of the box, eliminating toolchain complexity for beginners. Demos include USB HID mouse, USB CDC terminal, and touch-sensor HMI projects.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F26J53-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F46J53-I/SO | PIC18F25J50-I/SO | PIC18F26J13-I/SO |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (SO) | 28-SOIC (SO) | 28-SOIC (SO) | 28-SOIC (SO) |
| Flash Memory | 64 KB | 64 KB | 32 KB | 64 KB |
| RAM | 3.8 KB | 3.8 KB | 3.6 KB | 3.8 KB |
| USB | USB 2.0 Full-Speed integrated | USB 2.0 Full-Speed integrated | USB 2.0 Full-Speed integrated | USB 2.0 Full-Speed integrated |
| Operating Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Supply Voltage | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V |
| DMA Channels | Yes | Yes | Yes | No |
| Approx. Price (1 pc) | $4.42 | $5.10 | $3.65 | $3.85 |
Key Differentiators
- Highest-density USB-enabled 28-SOIC option in PIC18 J-series (vs PIC18F25J50-I/SO)
- Includes DMA for high-throughput USB (vs PIC18F26J13-I/SO)
- Industrial-grade 28-SOIC USB MCU with same die as 44-pin PIC18F47J53 (vs PIC18F47J53-I/PT)
Design Notes
The PIC18F26J53 requires a single 2.0V-3.6V supply and integrates a 3.3V LDO for the internal USB transceiver (VUSB pin). Place a 220nF bypass capacitor on VUSB as close to the pin as possible per datasheet recommendation. Add a 10uF bulk + 100nF decoupling pair on VDD to handle USB inrush currents when the device is enumerated. The internal LDO sources up to ~25 mA, so powering external circuits from VUSB must be checked against total budget. Estimated: peak supply current at 48MHz CPU + active USB = ~30 mA typical.
Route the USB D+ and D- lines as a 90-ohm differential pair with matched length, keeping them short and away from switching signals. The 28-SOIC pinout places D+ and D- on pins 25/26 next to VUSB, simplifying PCB layout. Provide a USB upstream connector with proper ESD protection (USBLC6-2SC6 or similar) on the bus lines - the MCU has no internal ESD protection rated for production use. Decoupling capacitors should be placed within 3mm of their respective supply pins for high-frequency effectiveness.
For USB full-speed compliance, the internal 48MHz oscillator must be trimmed within +/- 0.25% accuracy using the OSCTUNE register or external 48MHz crystal. When using the internal PLL from a lower-frequency crystal, verify the lock time (typically <1 ms) before USB enumeration to avoid host resets. The CTMU and ADC share sample-and-hold circuitry - sequence analog conversions carefully when reading multiple channels to avoid crosstalk. Estimated: ADC acquisition time at 12-bit resolution = ~1.4 us with 10k source impedance.
Do not exceed 3.6V on any pin - the PIC18 J-series is NOT 5V tolerant despite the legacy PIC18 naming. Use level shifters when interfacing 5V sensors or external EEPROMs. Ensure the ICSP pins (RB6/RB7) are not loaded with heavy capacitance during programming - this prevents debug failures. The internal USB pull-up resistor must be enabled in firmware (UCON.USBEN bit) for proper enumeration. Finally, leave the MCLR pin (not bonded on SOIC-28 variant) consideration aside - the J-series does not require an external MCLR unless using specific reset configurations.
The PIC18F26J53-I/SO in 28-SOIC has a thermal resistance (theta_JA) of approximately 80 C/W on standard JEDEC test board. At 48MHz active CPU + USB transmit, typical power dissipation is around 30 mW, resulting in a junction temperature rise of only ~2.4 C - no heatsink or thermal management required. The nanoWatt XLP deep sleep mode drops current below 100 nA, enabling multi-year battery operation in periodic-sampling applications. Estimated: idle current with RTC running = ~500 nA typical.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C. Not AEC-Q100 qualified - for automotive, choose AEC-Q100 qualified PIC18F variants.
