PIC18F25J50T-I/SS - 8-bit USB MCU 32KB Flash 48MHz SSOP-28 | Microchip
MPN: PIC18F25J50T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.5 | $3.50 |
| 10 | $3.15 | $31.50 |
| 100 | $2.75 | $275.00 |
| 500 | $2.4 | $1,200.00 |
| 1,000 | $2.1 | $2,100.00 |
PIC18F25J50T-I/SS Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (RAM), and peripherals such as timers, ADC, communication interfaces, and in this case a USB 2.0 Full-Speed transceiver. The PIC18F25J50 belongs to the PIC18 J-series, which is a low-power CMOS Flash MCU family within Microchip's broader 8-bit PIC taxonomy (PIC10/12/16/18). Its NanoWatt XLP technology adds Deep Sleep and other power-saving modes that drop current consumption to the nanoampere range, making it well-suited for USB-powered and battery-backed designs.
Key features include 32 KB (16K x 16) self-programmable Flash, 4 KB RAM, a 10-bit ADC with up to 10 channels, 2 analog comparators, 2 UART/SPI/I2C peripherals, 2 CCP/ECCP modules, a 48 MHz internal oscillator, and an integrated full-speed USB 2.0 device/host/OTG transceiver. The Deep Sleep mode lowers quiescent current dramatically for sleep-dominated applications such as USB suspend, while nanoWatt XLP peripherals and the on-chip RTCC keep wake-up time short.
The architecture is a RISC Harvard design with a modified 16-bit instruction word and 8-bit data path, supporting single-cycle instructions and hardware multiply, which delivers 16 MIPS peak throughput at 48 MHz. On-chip peripherals are mapped through Microchip's PMD (Peripheral Module Disable) registers, allowing unused blocks to be turned off for additional power savings. The integrated USB transceiver with on-chip pull-up resistors eliminates the external USB transceiver and pull-up that legacy designs required.
Typical applications include USB HID peripherals, USB-to-UART bridge dongles, low-power data loggers, sensor hubs with USB connectivity, and consumer-electronics user interfaces. Its USB On-The-Go capability also enables point-to-point device-to-device links without a host PC, useful for field service tools and embedded diagnostics.
When designing with this device, ensure the regulated 3.3 V supply falls within the 2.0-3.6 V operating range and place the decoupling capacitor network close to the VDD/VSS pins as recommended in the datasheet. For low-power sleep, verify that all wake sources are correctly configured and that unused I/O pins are set as outputs to minimize leakage.
This page synthesizes distributor pricing for the PIC18F25J50T-I/SS, same-family drop-in alternatives in the same 28-SSOP footprint, and practical design notes not found in the manufacturer datasheet, giving engineers a complete sourcing and design reference.
Drop-in alternatives for PIC18F25J50T-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 PIC18F25J50T-I/SS (same form factor and footprint) — differing in Package, Program Memory (Flash), MSL Level, ADC, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F25J50-I/SS
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F24J50-I/SS
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.85 / Unit
View Datasheet →PIC18F26J50-I/SS
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.96 / Unit
View Datasheet →PIC18F25J50T-I/SS Maximum Ratings & Electrical Characteristics
| Core | PIC18 / 8-bit RISC |
| Series | PIC18F J-series (PIC18F25J50) |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 4 KB |
| Maximum CPU Frequency | 48 MHz |
| Supply Voltage (VDD) | 2.0 V to 3.6 V |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 28-pin SSOP (SS) |
| Mounting Type | Surface Mount |
| USB | USB 2.0 Full-Speed (12 Mbps), Device/Host/OTG |
| ADC | 10-bit, up to 10 channels |
| Comparators | 2 analog comparators |
| CCP / ECCP Modules | 2 (1 CCP + 1 ECCP) |
| Communication Peripherals | 2x UART, 2x SPI, 2x I2C |
| Power-Saving Modes | NanoWatt XLP, Deep Sleep |
| RoHS Status | Compliant |
| MSL Level | 1 (unlimited) |
PIC18F25J50T-I/SS 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 — Digital I/O / analog input channel 2 |
| Pin 4 | RA3/AN3 — Digital I/O / analog input channel 3 |
| Pin 5 | RA4 — Digital I/O |
| Pin 6 | RA5 — Digital I/O |
| Pin 7 | VDD — Positive supply (2.0V to 3.6V) |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKI — Crystal oscillator input / external clock |
| Pin 10 | OSC2/CLKO — Crystal oscillator output |
| Pin 11 | RC0 — Digital I/O / CCP1 |
| Pin 12 | RC1 — Digital I/O / CCP2 |
| Pin 13 | RC2 — Digital I/O |
| Pin 14 | RC3 — Digital I/O |
| Pin 15 | RC4 — Digital I/O |
| Pin 16 | RC5 — Digital I/O |
| Pin 17 | RC6 — Digital I/O / UART TX |
| Pin 18 | RC7 — Digital I/O / UART RX |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply (2.0V to 3.6V) |
| Pin 21 | RB0 — Digital I/O / interrupt-on-change |
| Pin 22 | RB1 — Digital I/O |
| Pin 23 | RB2 — Digital I/O |
| Pin 24 | RB3 — Digital I/O |
| Pin 25 | RB4 — Digital I/O |
| Pin 26 | RB5 — Digital I/O |
| Pin 27 | RB6 — Digital I/O / ICSP clock |
| Pin 28 | RB7 — Digital I/O / ICSP data |
Typical Applications
PIC18F25J50T-I/SS is suitable for 7 applications: USB HID Peripherals, USB-to-UART Bridge Dongles, Low-Power Sensor Hubs, Consumer Electronics User Interfaces, USB On-The-Go Point-to-Point Links, Industrial Data Acquisition, Educational and Development Platforms.
USB HID Peripherals
The PIC18F25J50T-I/SS integrates a USB 2.0 Full-Speed transceiver with on-chip pull-up and full HID class support, making it ideal for HID peripherals such as keyboards, mice, and custom input devices. Its 48 MHz CPU delivers up to 16 MIPS, sufficient to handle HID report generation alongside application logic without external MCU. The 32 KB Flash holds a full USB stack plus HID descriptor and report logic, while 4 KB RAM keeps the working set for report buffers and protocol state. Power comes from the USB VBUS rail regulated to 3.3 V within the part's 2.0-3.6 V range. Deep Sleep mode reduces suspend current to support USB suspend compliance with minimal battery drain on wireless accessories.
Recommended
USB-to-UART Bridge Dongles
For low-cost USB-to-UART bridges the PIC18F25J50T-I/SS provides the integrated USB transceiver and an on-chip UART, eliminating external chips. The CDC class firmware fits easily within 32 KB Flash, and the industrial temperature range supports commercial-grade adapters. Running at 48 MHz the UART can drive up to 1 Mbps baud rates while the USB Full-Speed endpoint handles 12 Mbps bulk transfers. The 28-SSOP package is small enough for dongle form factors, and NanoWatt XLP with Deep Sleep reduces suspend current so the device can remain connected without exceeding USB suspend budgets.
Recommended
Low-Power Sensor Hubs
The PIC18F25J50T-I/SS NanoWatt XLP technology with Deep Sleep mode makes it suitable for battery-powered sensor hubs that occasionally attach to a USB host for data offload. The 10-bit ADC with up to 10 channels supports multiple analog sensors, and 2 comparators enable wake-on-threshold functions without waking the CPU. During sleep the RTCC and interrupt-on-change keep the device reactive to external events while drawing nanoamp-level currents. The 32 KB Flash holds local storage logic and USB stack, while 4 KB RAM buffers sensor data between USB transfers. Industrial -40C to +85C operation handles outdoor deployments.
Recommended
Consumer Electronics User Interfaces
For consumer interfaces with USB diagnostics ports, the PIC18F25J50T-I/SS provides USB device support, GPIO for buttons and LEDs, and ECCP for PWM-controlled backlighting. The 2 CCP/ECCP modules can drive RGB indicator LEDs or audio tones, and the 10-bit ADC handles potentiometers or analog sensors. The 28-SSOP footprint is suitable for compact consumer enclosures, and 3.3 V operation matches modern low-power system rails. The integrated USB eliminates the external transceiver and pull-up resistor that legacy PIC designs required, simplifying the BOM.
Recommended
USB On-The-Go Point-to-Point Links
The PIC18F25J50T-I/SS supports USB On-The-Go, enabling two devices to negotiate a point-to-point link without a host PC. This is useful for field service tools, embedded diagnostics, and data transfer between portable instruments. The integrated USB transceiver handles both host and device roles via the OTG session request protocol (SRP) and host negotiation protocol (HNP). 32 KB Flash fits the OTG stack plus role-switching logic, while 4 KB RAM holds dual-role state. The 28-SSOP industrial-temperature package fits compact handheld enclosures used in field service scenarios.
Recommended
Industrial Data Acquisition
For industrial data acquisition modules with USB output, the PIC18F25J50T-I/SS provides 10-bit ADC resolution across up to 10 channels, 2 comparators for threshold detection, and USB 2.0 Full-Speed for PC-side data transfer. The -40C to +85C industrial temperature range handles factory environments. The 32 KB Flash fits local buffer management and USB vendor-class firmware, while 4 KB RAM provides sample buffers between transfers. NanoWait XLP with Deep Sleep supports battery-backed installation where the unit wakes periodically to log and transmit data.
Recommended
Educational and Development Platforms
The PIC18F25J50T-I/SS is widely used in educational and development platforms because it combines USB 2.0, ample Flash (32 KB), and standard PIC18 peripherals in a small 28-SSOP package. The industrial temperature range supports student projects from indoor labs to outdoor field exercises. The PIC18 instruction set is well-documented with extensive example code in MPLAB X IDE and the Microchip code configurator, accelerating learning curves. Hobbyists value the integrated USB for projects that need PC connectivity without external transceivers.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F25J50T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F25J50-I/SS | PIC18F24J50-I/SS | PIC18F26J50-I/SS |
|---|---|---|---|---|
| Package | 28-pin SSOP (SS) | 28-pin SSOP (SS) - same | 28-pin SSOP (SS) - same | 28-pin SSOP (SS) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 32 KB | 16 KB | 64 KB |
| RAM | 4 KB | 4 KB | 4 KB | 4 KB |
| CPU Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| USB | USB 2.0 Full-Speed OTG | USB 2.0 Full-Speed OTG | USB 2.0 Full-Speed OTG | USB 2.0 Full-Speed OTG |
| Operating Voltage | 2.0V to 3.6V | 2.0V to 3.6V | 2.0V to 3.6V | 2.0V to 3.6V |
| ADC | 10-bit, 10 channels | 10-bit, 10 channels | 10-bit, 10 channels | 10-bit, 10 channels |
Key Differentiators
- Integrated USB 2.0 Full-Speed with OTG and on-chip pull-up (vs PIC18F2550 (PIC18 legacy USB family))
- NanoWatt XLP with Deep Sleep mode (vs PIC18F24J50-I/SS (same family, lower Flash))
- 32 KB Flash with 48 MHz CPU (vs PIC18F24J50-I/SS (16 KB Flash))
Design Notes
Estimated: at 48 MHz and 3.3 V VDD with all peripherals active, the PIC18F25J50T-I/SS core draws approximately 15-20 mA. Deep Sleep mode reduces current consumption to under 100 nA typical, but the RTCC and selected interrupts must be configured before entering Deep Sleep. For USB suspend compliance, current must drop below 2.5 mA when the host signals suspend; configure the PMD registers to disable unused peripherals before sleep entry.
Place decoupling capacitors (typically 100 nF ceramic in parallel with 10 uF bulk) as close as possible to the VDD/VSS pin pairs on the 28-SSOP. For USB designs, the D+/D- traces must be length-matched within 1 mm and kept away from high-frequency switching nodes to maintain USB 2.0 Full-Speed signal integrity. The 28-SSOP thermal pad is not present; ground the PCB copper pour around the device for thermal dissipation.
Do not exceed the 3.6 V absolute maximum on VDD or the USB D+/D- pins. When using the internal USB pull-up, ensure the UCEN bit in UCFG is configured correctly for device mode. The configuration bits must be programmed to enable the internal 48 MHz oscillator and disable the watchdog unless explicitly required by the application. For low-power designs, remember that any floating digital input can cause leakage in Deep Sleep mode - configure unused pins as outputs or enable internal pull-downs.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature -40C to +85C. Not AEC-Q100 qualified - this is a commercial/industrial part. Lead-free and halogen-free per Microchip material declaration.
