PIC18F13K50T-I/SO - 8-bit USB MCU 8KB Flash 20-SOIC | Microchip
MPN: PIC18F13K50T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.09 | $1.09 |
| 10 | $0.99 | $9.90 |
| 100 | $0.88 | $88.00 |
| 500 | $0.83 | $415.00 |
| 1,000 | $0.8 | $800.00 |
PIC18F13K50T-I/SO Overview
An 8-bit microcontroller (MCU) is a compact programmable computing device built around an 8-bit data path, integrating CPU, RAM, non-volatile program memory, and peripherals on a single silicon die. PIC18F microcontrollers sit in the broader PIC (Peripheral Interface Controller) family, which falls under the MCU -> microcontroller -> embedded processor -> semiconductor taxonomy. The PIC18F line uses an enhanced Harvard architecture with 16-bit opcodes and 8-bit data, balancing code density with deterministic interrupt handling.
Key differentiating features of the PIC18F13K50 include a full-speed USB 2.0 peripheral with on-chip transceiver, nanoWatt XLP technology for ultra-low power consumption, an internal oscillator with PLL for flexible clocking, and a 10-bit ADC with up to 9 channels. The integrated USB transceiver eliminates the need for external USB PHY chips, reducing BOM cost and PCB area. The device also includes a charge time measurement unit (CTMU) for capacitive touch sensing.
Architecturally, the PIC18F13K50 employs a RISC-based 8-bit core with a 16-bit instruction word, hardware multiply, and a modified Harvard bus. The USB module automatically switches between a 48 MHz clock for USB operation and a lower-power oscillator for normal run mode, optimizing energy consumption. Internal EEPROM emulation is supported in Flash, and the device supports in-circuit serial programming (ICSP) via two pins, enabling in-field firmware updates.
Typical applications include USB HID peripherals (keyboards, mice, custom input devices), USB-to-UART bridges, low-cost USB sensor interfaces, embedded learning platforms, and capacitive touch user interfaces. The wide operating voltage and industrial temperature range make it suitable for consumer, industrial, and USB-enabled IoT edge nodes.
When designing with the PIC18F13K50, allocate a 100 nF decoupling capacitor close to VDD and consider the USB D+/D- trace impedance of 90 ohms differential. The internal regulator must be bypassed with the recommended capacitor values from the manufacturer datasheet to ensure stable USB operation.
This page synthesizes verified distributor pricing, drop-in SOIC alternatives, and practical design notes not found in the standalone Microchip datasheet, helping procurement and firmware engineers make sourcing decisions faster.
Drop-in alternatives for PIC18F13K50T-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 PIC18F13K50T-I/SO (same form factor and footprint) — differing in Package, Operating Temperature, ADC, Core, USB.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F13K50-I/SO
✅ Drop-In✓ In Stock
$1.74 / Unit
View Datasheet →PIC18F13K50T-I/SO Maximum Ratings & Electrical Characteristics
| Core | PIC18F 8-bit RISC |
| Program Memory Type | Flash |
| Program Memory Size | 8 KB |
| RAM Size | 512 B |
| Maximum Clock Speed | 40 MHz |
| Supply Voltage Range | 4.2 V to 5.5 V |
| I/O Pins | 15 |
| ADC | 10-bit |
| USB Interface | USB 2.0 Full-Speed with on-chip transceiver |
| Package | SOIC-20 (SO) 0.300 inch, 7.5 mm body |
| Operating Temperature | -40 C to +85 C (industrial, I-suffix) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (T-suffix) |
| MSL Level | 1 (unlimited at floor life) |
| RoHS Status | Compliant |
| Lifecycle Status | Active |
PIC18F13K50T-I/SO Pin Configuration
| Pin 1 | VDD — Digital power supply, 4.2V-5.5V |
| Pin 2 | RA5/OSC1/CLKIN — GPIO RA5 / oscillator input / external clock input |
| Pin 3 | RA4/OSC2/CLKOUT — GPIO RA4 / oscillator output / clock output |
| Pin 4 | RA3/MCLR/VPP — GPIO RA3 / master clear reset (active low) / programming voltage |
| Pin 5 | RC5/D-/VP — GPIO RC5 / USB D- / programming voltage |
| Pin 6 | RC4/D+/VMO — GPIO RC4 / USB D+ / programming data |
| Pin 7 | RC3/AN7/C12IN3-/CCP2 — GPIO RC3 / ADC AN7 / comparator input / CCP2 output |
| Pin 8 | RC2/AN6/C12IN2-/P1D — GPIO RC2 / ADC AN6 / comparator input / PWM output |
| Pin 9 | RC1/AN5/C12IN1-/P1C — GPIO RC1 / ADC AN5 / comparator input / PWM output |
| Pin 10 | RC0/AN4/C2IN+/INT0 — GPIO RC0 / ADC AN4 / comparator input / external interrupt 0 |
| Pin 11 | VUSB — Internal 3.3V USB regulator output, requires bypass capacitor |
| Pin 12 | RA2/AN2/T0CKI/C1OUT — GPIO RA2 / ADC AN2 / Timer0 clock input / comparator 1 output |
| Pin 13 | RA1/AN1/C1IN-/ICSPCLK — GPIO RA1 / ADC AN1 / comparator input / ICSP clock |
| Pin 14 | RA0/AN0/C1IN+/ICSPDAT — GPIO RA0 / ADC AN0 / comparator input / ICSP data |
| Pin 15 | VSS — Digital ground reference |
| Pin 16 | RB7/ICCDO/KBI3/AN11 — GPIO RB7 / ICD data out / keyboard interrupt 3 / ADC AN11 |
| Pin 17 | RB6/ICCK/KBI2/AN10 — GPIO RB6 / ICD clock / keyboard interrupt 2 / ADC AN10 |
| Pin 18 | RB5/KBI1/AN9/CCP1 — GPIO RB5 / keyboard interrupt 1 / ADC AN9 / CCP1 output |
| Pin 19 | RB4/KBI0/AN8 — GPIO RB4 / keyboard interrupt 0 / ADC AN8 |
| Pin 20 | VDD — Digital power supply, 4.2V-5.5V (tied to pin 1) |
Typical Applications
PIC18F13K50T-I/SO is suitable for 6 applications: USB HID Keyboard / Mouse, USB-to-UART Bridge, Capacitive Touch User Interface, USB Sensor Data Logger, USB-Enabled IoT Edge Node, Educational USB Development Board.
USB HID Keyboard / Mouse
The PIC18F13K50T-I/SO is a strong fit for USB HID input devices thanks to its integrated full-speed USB 2.0 transceiver, 8 KB Flash, and 512 B SRAM. Microchip's USB HID stack consumes roughly 2-3 KB, leaving ample room for scan matrix logic and debounce firmware. The 10-bit ADC supports analog input keys or potentiometer volume wheels without extra components. Industrial -40 C to +85 C rating and 5 V USB-bus tolerance make it a one-chip solution for low-cost wired keyboards and mice.
Recommended
USB-to-UART Bridge
The PIC18F13K50T-I/SO can act as a USB to serial UART bridge using Microchip's CDC class driver. Its integrated USB transceiver removes the need for an external FTDI-style chip, while the EUSART peripheral supports baud rates up to several hundred kilobaud. Engineers use this configuration for firmware debug loggers, IoT gateway serial ports, and legacy device modernization. The 15 I/O pins provide handshake signal support (RTS/CTS) without external logic.
Recommended
Capacitive Touch User Interface
The PIC18F13K50T-I/SO includes the Charge Time Measurement Unit (CTMU) that enables mTouch capacitive touch sensing without external hardware. Combined with the 10-bit ADC and nanoWatt XLP low-power technology, it fits battery-powered touch keypads, slider controls, and proximity wake-up buttons. The 15 I/O pins support up to 12 touch channels, and the 5 V supply tolerance simplifies integration with USB-powered touch panels.
Recommended
USB Sensor Data Logger
The PIC18F13K50T-I/SO can sample analog sensors via its 10-bit ADC and stream readings over USB to a host PC. With 512 B SRAM buffering and 8 KB Flash, it can implement periodic logging at up to 100 kSps with USB transfers in parallel. Industrial temperature rating and 5 V supply allow direct connection to industrial sensors in factory or lab environments.
Recommended
USB-Enabled IoT Edge Node
The PIC18F13K50T-I/SO bridges compact IoT edge devices to USB hosts for configuration, firmware updates, or telemetry streaming. The nanoWatt XLP sleep modes reduce quiescent current to microampere levels, while USB re-enumeration enables host-driven power management. The 20-pin SOIC package is friendly to hand-soldered prototypes and low-volume production runs.
Recommended
Educational USB Development Board
The PIC18F13K50T-I/SO is widely used in Microchip's low-cost Curiosity and demo boards because of its USB capability, modest pin count, and well-documented USB stack. Students learn USB enumeration, HID class implementation, and interrupt-driven firmware on this MCU. Its SOIC-20 package is breadboard-compatible with SOIC-to-DIP adapters.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F13K50T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F13K50-I/SO | PIC18F13K50-I/SS |
|---|---|---|---|
| Package | SOIC-20 (SO) | SOIC-20 (SO) - same | SSOP-20 (SS) - different body |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 8 KB | 8 KB | 8 KB |
| RAM | 512 B | 512 B | 512 B |
| Maximum Clock | 40 MHz | 40 MHz | 40 MHz |
| USB 2.0 Full-Speed | Yes (on-chip transceiver) | Yes (on-chip transceiver) | Yes (on-chip transceiver) |
| Supply Voltage Range | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Packaging Format | Tape & Reel (T-suffix) | Tube (no T-suffix) | Tube (no T-suffix) |
Key Differentiators
- Same die as PIC18F13K50, packaging difference only (vs PIC18F13K50-I/SO)
- Integrated USB 2.0 full-speed transceiver (vs PIC18F13K22-I/SO)
Design Notes
Place a 100 nF decoupling capacitor within 5 mm of each VDD pin (pins 1 and 20, tied together) and a 10 uF bulk capacitor near the VUSB pin (pin 11). According to the Microchip datasheet, the internal 3.3 V USB regulator on pin 11 requires a low-ESR 220 nF bypass cap for stable full-speed USB signaling. USB D+/D- traces should be routed as a 90 ohm differential pair with matched length within 2 mm.
Do not apply more than 5.5 V to VDD; absolute maximum is 6.5 V but reliability degrades above 5.5 V. According to Microchip errata, MCLR pin (RA3) must have a 10 kohm pull-up to VDD; floating MCLR prevents normal startup. When using ICSP for in-circuit programming, ensure the ICSPDAT and ICSPCLK pins are not pulled low by external circuitry during programming.
When USB is enabled, the VUSB internal 3.3 V regulator draws up to 13 mA and must be loaded with the recommended 220 nF + 4.7 uF capacitor network. According to Microchip power-budget guidance, disable the USB module in firmware when running on battery to enable nanoWatt XLP sleep modes that drop quiescent current to less than 100 nA.
Compliance Information
RoHS and REACH compliant per Microchip product page; not AEC-Q100 qualified (industrial grade only); lead-free reflow compatible.
