PIC18F26J50T-I/SS - 48MHz USB MCU 64KB Flash 28-SSOP | Microchip
MPN: PIC18F26J50T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.36 | $336.00 |
| 500 | $2.97 | $1,485.00 |
| 1,000 | $2.69 | $2,690.00 |
PIC18F26J50T-I/SS Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripheral interfaces on one silicon die. The PIC18F26J50T-I/SS belongs to the PIC18J family, which uses Microchip's enhanced 8-bit RISC core and adds full-speed USB 2.0 on-chip — eliminating the need for an external USB transceiver. Within the broader taxonomy, this part sits as: microcontroller -> 8-bit MCU -> embedded controller -> semiconductor IC.
Key features include 64KB (32K x 16) flash program memory, 4KB SRAM, 1KB EEPROM, nanoWatt XLP power management for deep-sleep currents below 1 µA, two USART, two SPI/I2C, a 10-bit ADC up to 10 channels, and a CTMU for capacitive touch sensing. The integrated USB 2.0 full-speed transceiver supports both device and limited host/OTG roles with internal pull-up resistors.
Architecturally, the PIC18J core combines a 16-bit-wide flash program word (75 ns single-word instruction fetch) with a peripheral bus operating at up to FOSC/4. The CTMU, hardware RTCC, and nanoWatt XLP sleep modes let the same firmware drive both line-powered and battery-backed applications.
Typical applications include USB peripherals (HID, CDC, custom-class), low-power sensor nodes with USB enumeration, capacitive touch user interfaces, consumer appliances with diagnostic USB ports, and industrial data loggers with USB mass-storage bootloaders. The wide operating voltage (2.0V to 3.6V) suits both 3.3V regulators and two-AA-cell battery rails.
For design, follow Microchip's PIC18F46J50 family datasheet recommendations: place the VUSB 3.3V regulator capacitor within 5 mm of the pin, route the D+/D- pair as a 90-ohm differential pair, and use the internal pull-ups rather than external resistors when the device is self-powered.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical layout/design notes not found in the manufacturer datasheet — giving procurement and firmware engineers a single reference for PIC18F26J50T-I/SS evaluation and BOM decisions.
Drop-in alternatives for PIC18F26J50T-I/SS — 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 PIC18F26J50T-I/SS (same form factor and footprint) — differing in ADC, Maximum CPU Speed, Package, Program Memory (Flash), Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F25J50T-I/SS
✅ Drop-In✓ In Stock
$2.1 / Unit
View Datasheet →PIC18F26J50T-I/ML
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.65 / Unit
View Datasheet →PIC18F26J50-I/SS
✅ Drop-In✓ In Stock
$1.96 / Unit
View Datasheet →PIC18F46J50T-I/SS
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18LF26J50T-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F26J50T-I/SS Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit RISC (enhanced) |
| Program Memory (Flash) | 64 KB (32K x 16) |
| SRAM | 4 KB |
| Maximum CPU Speed | 48 MHz (12 MIPS) |
| Supply Voltage (VDD) | 2.0 V to 3.6 V |
| I/O Pins | 25 |
| USB Interface | USB 2.0 Full-Speed (12 Mbps), on-chip transceiver |
| ADC | 10-bit, up to 10 channels |
| Timers | 5 (Timer0/1/2/3 + RTCC) |
| Communication | 2x USART, 2x MSSP (SPI/I2C) |
| CTMU | Yes (capacitive touch) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 28-SSOP (5.30 mm body) |
| Mounting Type | Surface Mount |
| MSL Level | 1 |
| RoHS Status | Compliant |
| Power-Saving Modes | nanoWatt XLP, Deep Sleep (<1 µA typical) |
PIC18F26J50T-I/SS Pin Configuration
| Pin 1 | RA0/AN0 — I/O / ADC0 / CTMU |
| Pin 2 | RA1/AN1 — I/O / ADC1 / CTMU |
| Pin 3 | RA2/AN2/VREF- — I/O / ADC2 / VREF- |
| Pin 4 | RA3/AN3/VREF+ — I/O / ADC3 / VREF+ |
| Pin 5 | RA4 — I/O (no AN4 on this pin) |
| Pin 6 | RA5/AN4 — I/O / ADC4 |
| Pin 7 | VDD — Positive supply (2.0-3.6 V) |
| Pin 8 | VSS — Ground reference |
| Pin 9 | RA7 — I/O / Oscillator |
| Pin 10 | RA6 — I/O / Oscillator |
| Pin 11 | RC0 — I/O |
| Pin 12 | RC1 — I/O |
| Pin 13 | RC2 — I/O |
| Pin 14 | D- — USB D- data line |
| Pin 15 | D+ — USB D+ data line |
| Pin 16 | VUSB — Internal USB 3.3V regulator output (bypass cap) |
| Pin 17 | RC4 — I/O |
| Pin 18 | VDD — Positive supply (2.0-3.6 V) |
| Pin 19 | VSS — Ground reference |
| Pin 20 | RB0/AN12 — I/O / ADC12 |
| Pin 21 | RB1/AN10 — I/O / ADC10 |
| Pin 22 | RB2/AN8 — I/O / ADC8 |
| Pin 23 | RB3/AN9 — I/O / ADC9 |
| Pin 24 | RB4/AN11 — I/O / ADC11 |
| Pin 25 | RB5/AN13 — I/O / ADC13 |
| Pin 26 | RB6/PGC — I/O / ICSP clock |
| Pin 27 | RB7/PGD — I/O / ICSP data |
| Pin 28 | RE3/MCLR — Master Clear (reset, active low) |
Typical Applications
PIC18F26J50T-I/SS is suitable for 6 applications: USB HID Peripherals, Capacitive Touch USB User Interface, USB Sensor Data Loggers, Low-Power Battery USB Chargers / Diagnostics, Consumer Appliance Diagnostic Ports, USB Bootloader Hosts.
USB HID Peripherals
The PIC18F26J50T-I/SS delivers integrated USB 2.0 full-speed (12 Mbps) with on-chip transceiver, making it ideal for HID-class devices such as keyboards, mice, game controllers, and custom input peripherals. The 64 KB flash (32K x 16 words) holds a USB HID stack plus application firmware; the 4 KB SRAM provides descriptor buffering and HID report queues. nanoWatt XLP deep-sleep below 1 µA typical allows battery-powered HID devices to wake on edge-triggered interrupts without external glue logic.
Recommended
Capacitive Touch USB User Interface
The PIC18F26J50T-I/SS integrates a Charge Time Measurement Unit (CTMU) that measures capacitance with sub-pF resolution, enabling up to 25 capacitive touch electrodes via its 25 I/O pins. Combined with USB for firmware update, designers can build sealed-key touch panels for appliances, medical user interfaces, or rugged industrial controls where mechanical buttons fail. The 10-bit ADC at up to 10 channels supports slider/wheel overlays; deep-sleep mode keeps touch-scan power below 50 µA average.
Recommended
USB Sensor Data Loggers
Industrial and environmental sensor nodes can use the PIC18F26J50T-I/SS to acquire analog signals via the 10-bit ADC and periodically enumerate as USB mass storage, allowing field engineers to retrieve log files without special software. The 64 KB flash holds a FAT12/16 stack plus log buffers; 4 KB SRAM smooths write bursts. nanoWalt XLP sleep below 1 µA means a 2xAA cell pair can power a logging session spanning months, with the ADC running on RTCC wake events.
Recommended
Low-Power Battery USB Chargers / Diagnostics
The PIC18F26J50T-I/SS in 28-SSOP lets consumer chargers and power banks expose a USB diagnostic port for monitoring charge state, current, and temperature. The 25 I/O pins drive LED indicators, monitor temperature via ADC, and read thermistor networks. Operates from 2.0-3.6 V direct from a Li-ion cell, removing the need for a separate LDO; USB VUSB internal regulator supplies transceiver rails directly. Deep-sleep keeps standby current negligible.
Recommended
Consumer Appliance Diagnostic Ports
Modern appliances (coffee machines, washing machines, HVAC controllers) embed a USB diagnostic port for service technicians. The PIC18F26J50T-I/SS supplies a CDC-class USB serial interface plus 25 GPIO for relays and sensors, all in a 28-SSOP that fits behind a small service door. nanoWatt XLP keeps the controller in sleep until the USB cable is plugged, drawing under 1 µA during standby; on insertion the firmware enumerates within milliseconds.
Recommended
USB Bootloader Hosts
Production programmers can use the PIC18F26J50T-I/SS as a USB host bridge to field-update other PIC18 devices via ICSP. The MCU enumerates as a USB HID custom-class device, talks to a PC application, and re-drives ICSP clock/data lines from its 25 I/O. The 28-SSOP footprint plus 64 KB flash and 4 KB RAM lets the same board run HID, ICSP protocols, and EEPROM emulation for firmware version tracking in a single chip.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F26J50T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F25J50T-I/SS | PIC18LF26J50T-I/SS | PIC18F26J50-I/SS |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SSOP (same) | 28-SSOP (same) | 28-SSOP (same) |
| Flash | 64 KB | 32 KB (-50%) | 64 KB | 64 KB |
| RAM | 4 KB | 4 KB | 4 KB | 4 KB |
| USB 2.0 Full-Speed | Yes (on-chip) | Yes | Yes | Yes |
| Max CPU Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| I/O Pins | 25 | 25 | 25 | 25 |
| Supply Voltage | 2.0 V - 3.6 V | 2.0 V - 3.6 V | 2.0 V - 3.6 V | 2.0 V - 3.6 V |
Key Differentiators
- On-chip USB 2.0 full-speed transceiver (vs PIC18F2550-I/SO)
- nanoWatt XLP deep-sleep < 1 µA typical (vs PIC18F25K50-I/SO)
- CTMU for hardware capacitive touch (vs PIC18F46K22-I/P)
Design Notes
USB D+/D- (pins 14, 15) must be routed as a 90-ohm differential pair, with characteristic impedance matched to the USB cable. Keep traces under 50 mm and route over an unbroken ground plane per the PIC18F46J50 family datasheet. Place the VUSB bypass capacitor (typically 220 nF) within 5 mm of pin 16; without it the internal 3.3V regulator is unstable and USB enumeration fails.
The internal VUSB regulator supplies the USB transceiver; if USB is unused, leave VUSB floating or tied through a 220 nF cap to VSS. VDD may be supplied from a 3.3V LDO or directly from a Li-ion cell (3.0-4.2 V requires an LDO). nanoWatt XLP deep-sleep currents stay below 1 µA typical but rise if digital I/O are left floating — always tie unused pins to defined logic levels.
Do not confuse the PIC18F26J50 family with the older PIC18F2550 family: the J50 parts use nanoWatt XLP and an internal USB regulator, while 2550 requires an external 3.3V supply for VUSB. Programming voltage (MCLR/RA5) is 13V typical for high-voltage ICSP but the device supports low-voltage ICSP via the standard PGC/PGD pair on pins 26/27. Programming tool: PICkit 3, PICkit 4, MPLAB ICD 4.
Place the 28-SSOP decoupling network as close to the package as possible: a 100 nF ceramic on VDD/VSS pin pairs (7/8 and 18/19), plus a bulk 4.7 µF tantalum or ceramic near the package. Separate analog (AVDD/AVSS) and digital grounds if using the ADC for precision measurements, joining them at a single point near the IC. The CTMU's charge-pump noise couples easily if analog traces cross noisy digital traces.
Compliance Information
RoHS/REACH compliant per Microchip product page. Industrial temperature grade -40C to +85C; no AEC-Q100 variant available.
