PIC18F27J53T-I/SS - 8-bit USB MCU 128KB Flash 28-SSOP | Microchip
MPN: PIC18F27J53T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.85 | $4.85 |
| 10 | $4.36 | $43.60 |
| 100 | $3.62 | $362.00 |
| 500 | $3.1 | $1,550.00 |
| 1,000 | $2.74 | $2,740.00 |
PIC18F27J53T-I/SS Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash/ROM), data memory (RAM), and programmable peripherals on one die. The PIC18 family uses a RISC architecture with 16-bit instructions optimized for C compilation, sitting within the broader hierarchy: PIC18 -> 8-bit PIC microcontrollers -> microcontroller -> embedded computing IC -> semiconductor. The PIC18F27J53T-I/SS specifically belongs to the PIC18 J-series, which adds full-speed USB 2.0 and nanoWatt XLP deep-sleep modes to the standard PIC18 feature set, targeting cost-sensitive USB-enabled embedded designs.
Key differentiating specifications include a 48 MHz internal oscillator providing up to 12 MIPS throughput, 22 digital I/O pins, two analog comparators, two UART/USART, two SPI, two I2C, one USB full-speed 2.0 device/host/OTG controller with internal transceiver, 256 bytes EEPROM, CTMU for capacitive touch, and deep-sleep current down to approximately 20 nA in nanoWatt XLP mode. The 28-SSOP footprint measures 7.50 mm x 5.60 mm with 0.65 mm pitch, suitable for moderate-density designs that need more I/O than the 20-pin PIC18F25J53 sibling.
Typical applications include USB human-interface devices (HID keyboards, mice, game controllers), USB-to-UART bridges, USB sensors (temperature, gas, biomedical), low-power data loggers, capacitive touch buttons with USB interface, industrial control with USB diagnostics, and consumer accessories such as USB audio controls. The integrated USB transceiver eliminates the need for an external PHY, reducing BOM cost and PCB area.
When designing with this device, place the VUSB decoupling capacitor close to the VUSB pin, ensure the 48 MHz PLL is configured per the datasheet's oscillator tuning section, and observe the 3.6 V absolute maximum on VDD - the PIC18 J-series is NOT 5V tolerant. Connect unused I/O pins to defined logic levels to minimize current draw.
This page synthesizes distributor pricing, drop-in alternatives within the PIC18 family, and practical design notes not found in the manufacturer datasheet, helping procurement and firmware engineers select the right USB-enabled 8-bit MCU for cost-sensitive embedded products.
Drop-in alternatives for PIC18F27J53T-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 PIC18F27J53T-I/SS (same form factor and footprint) — differing in ADC, Maximum CPU Speed, Operating Temperature, Package, Series.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F27J53-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F26J53T-I/SS
✅ Drop-In✓ In Stock
$3.2 / Unit
View Datasheet →PIC18F47J53T-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F27J13T-I/SS
✅ Drop-In✓ In Stock
$3.04 / Unit
View Datasheet →PIC18F46J53T-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F27J53T-I/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit RISC, 16-bit instructions) |
| Series | PIC18 J-series (XLP nanoWatt) |
| Program Memory (Flash) | 128 KB (64K x 16) |
| Data RAM | 3.8 KB |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 48 MHz (12 MIPS) |
| Supply Voltage (VDD) | 2.15 V to 3.6 V |
| I/O Pins | 22 |
| ADC | 10-channel, 12-bit |
| USB | USB 2.0 Full-Speed, Device/Host/OTG, internal transceiver |
| UART/USART | 2 |
| SPI | 2 |
| I2C | 2 (MSSP) |
| Analog Comparators | 2 |
| CTMU (Capacitive Touch) | Yes |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 28-pin SSOP (5.30 mm body width) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life) |
| RoHS Status | Compliant |
PIC18F27J53T-I/SS Pin Configuration
| Pin 1 | RA0/AN0 — Digital I/O / Analog input 0 |
| Pin 2 | RA1/AN1 — Digital I/O / Analog input 1 |
| Pin 3 | RA2/AN2 — Digital I/O / Analog input 2 |
| Pin 4 | RA3/AN3 — Digital I/O / Analog input 3 |
| Pin 5 | RA4/AN4 — Digital I/O / Analog input 4 |
| Pin 6 | RA5/AN5 — Digital I/O / Analog input 5 |
| Pin 7 | VDD — Power supply (2.15V to 3.6V) |
| Pin 8 | VSS — Ground |
| Pin 9 | OSC1/RA7 — Oscillator input / Digital I/O |
| Pin 10 | OSC2/RA6 — Oscillator output / Digital I/O |
| Pin 11 | RC0 — Digital I/O |
| Pin 12 | RC1 — Digital I/O |
| Pin 13 | RC2 — Digital I/O |
| Pin 14 | VUSB — USB transceiver supply (3.3V typical) |
| Pin 15 | RC4/D- — Digital I/O / USB D- |
| Pin 16 | RC5/D+ — Digital I/O / USB D+ |
| Pin 17 | RC6 — Digital I/O |
| Pin 18 | RC7 — Digital I/O |
| Pin 19 | VSS — Ground |
| Pin 20 | VDD — Power supply (2.15V to 3.6V) |
| Pin 21 | RB0/AN8 — Digital I/O / Analog input 8 |
| Pin 22 | RB1/AN9 — Digital I/O / Analog input 9 |
| 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/PGC — Digital I/O / ICSP clock |
| Pin 28 | RB7/PGD — Digital I/O / ICSP data |
Typical Applications
PIC18F27J53T-I/SS is suitable for 6 applications: USB HID Peripheral (Keyboard, Mouse, Game Controller), USB-to-UART/I2C/SPI Bridge, USB Sensor (Temperature, Gas, Biomedical), Capacitive Touch with USB Interface, Low-Power USB Data Logger, Industrial USB Diagnostic Tool.
USB HID Peripheral (Keyboard, Mouse, Game Controller)
The PIC18F27J53T-I/SS is purpose-built for USB HID peripherals thanks to its integrated USB 2.0 full-speed controller with on-chip transceiver, eliminating the need for an external PHY that would otherwise add $0.30-$0.50 BOM cost. The 128KB Flash easily accommodates the Microchip USB HID stack (~6KB), HID report descriptor, and the application firmware. With 12 MIPS throughput and a 48MHz internal oscillator, it handles USB polling at the required 1ms interval with headroom for button matrix scanning, LED PWM, and capacitive touch via the CTMU module.
Recommended
USB-to-UART/I2C/SPI Bridge
The PIC18F27J53T-I/SS serves as a flexible USB-to-serial bridge thanks to its dual UART, dual SPI, and dual I2C peripherals alongside the integrated USB 2.0 full-speed device controller. Engineers can implement CDC (Communications Device Class) firmware on the PIC18 J-series to expose a UART/I2C/SPI on the host side via USB. With 128KB Flash, the firmware easily fits the USB stack plus protocol multiplexing logic; with 3.8KB RAM, it supports 64-byte USB packet buffers and command parsing without external SRAM.
Recommended
USB Sensor (Temperature, Gas, Biomedical)
The PIC18F27J53T-I/SS enables USB-powered sensor peripherals by combining the integrated USB 2.0 FS transceiver (bus-powered, no external supply needed), 10-channel 12-bit ADC for analog sensor readout, and nanoWatt XLP deep-sleep mode at ~20nA for low standby current. The 12-bit ADC with 100 ksps sampling rate is suitable for thermocouples (with cold-junction compensation), gas sensor conductivity, and biomedical probes (pulse oximetry front-ends). With 128KB Flash, on-sensor calibration tables and smoothing algorithms fit without external memory.
Recommended
Capacitive Touch with USB Interface
The PIC18F27J53T-I/SS integrates the CTMU (Charge Time Measurement Unit) for capacitive touch sensing and pairs it with USB 2.0 FS to deliver touch events directly to a host PC or embedded system. The CTMU measures capacitance changes down to sub-pF resolution, supporting 10+ touch buttons per board via the 22 I/O pins. The 12 MIPS core handles real-time CTMU scans at 100Hz refresh while servicing USB HID reports in parallel, all in the 28-SSOP package footprint.
Recommended
Low-Power USB Data Logger
Battery-powered USB data loggers benefit from the PIC18F27J53T-I/SS's nanoWatt XLP deep-sleep mode (~20nA with RTCC) combined with the integrated USB 2.0 FS for plug-and-play data retrieval on a PC. The 128KB Flash stores weeks of compressed sensor logs; the 3.8KB RAM buffers samples between writes. Engineers can implement a USB MSD (Mass Storage Device) class to expose the internal Flash as a drive, eliminating the need for an external EEPROM or SD card in cost-sensitive logger designs.
Recommended
Industrial USB Diagnostic Tool
The PIC18F27J53T-I/SS enables field-portable industrial diagnostic tools by combining USB 2.0 FS connectivity, RS-232/RS-485 UART capability, 12-bit ADC for sensor measurements, and the industrial -40C to +85C operating range. With 22 I/O pins, engineers can directly interface to legacy industrial busses (RS-485 via external transceiver), 4-20mA current loops, and opto-isolated digital I/O. The 128KB Flash stores diagnostic protocols and calibration tables; the integrated USB exposes a virtual COM port for PC-side SCADA software.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F27J53T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F27J53-I/SS | PIC18F26J53T-I/SS | PIC18F47J53T-I/SS | PIC18F27J13T-I/SS | PIC18F46J53T-I/SS |
|---|---|---|---|---|---|---|
| Package | 28-SSOP | 28-SSOP (same) | 28-SSOP (same) | 28-SSOP (same) | 28-SSOP (same) | 28-SSOP (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 128 KB | 64 KB | 128 KB | 128 KB | 64 KB |
| RAM | 3.8 KB | 3.8 KB | 3.8 KB | 7.8 KB | 3.8 KB | 3.8 KB |
| Integrated USB 2.0 FS | Yes (with internal transceiver) | Yes | Yes | Yes | No | Yes |
| ADC Resolution | 12-bit, 10-ch | 12-bit, 10-ch | 12-bit, 10-ch | 12-bit, 13-ch | 10-bit, 10-ch | 12-bit, 13-ch |
| CPU Speed | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS |
| I/O Pins | 22 | 22 | 22 | 34 (44-pin variants differ) | 22 | 34 (44-pin variants differ) |
| CTMU Capacitive Touch | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Integrated USB 2.0 Full-Speed transceiver eliminates external PHY (vs PIC18F2550 (requires external USB transceiver))
- Higher Flash density in 28-SSOP package (vs PIC18F26J53T-I/SS)
- nanoWatt XLP deep-sleep for battery-powered USB peripherals (vs PIC18F47J53T-I/SS)
Design Notes
The PIC18F27J53T-I/SS is NOT 5V tolerant - exceeding the 3.6V absolute maximum on VDD or any I/O pin causes permanent damage. Use a 3.3V LDO such as MCP1700 or MIC5205 for any 5V-input designs, and add a 4.7uF ceramic decoupling capacitor close to each VDD pin pair (pins 7, 20) and a 0.1uF ceramic for high-frequency noise. The VUSB pin (pin 14) requires a separate 1uF-10uF decoupling capacitor for the internal USB transceiver.
The USB D+ line (RC5, pin 16) requires a 1.5k pull-up resistor to VUSB for full-speed device enumeration. The USB stack requires a 48MHz clock - either from the 8x PLL of the internal 6MHz oscillator (configure OSCTUNE<PLLEN>) or from an external 48MHz crystal on OSC1/OSC2. Brown-out Reset (BOR) must be enabled in configuration bits; if disabled, the MCU can latch up at low VDD during USB bus-powered startup.
For USB compliance, the D+ and D- traces (RC4/RC5) must be routed as a 90-ohm differential pair, matched within 150 mil length mismatch, and kept away from switching signals. Place the 1.5k pull-up on D+ close to the MCU. The SSOP-28 thermal pad is not exposed - thermal dissipation is via the 22 GND-bonded pins; ensure adequate ground copper pour for USB suspend current stability.
Estimated: at 48 MHz CPU speed and 3.3V supply, the PIC18F27J53T-I/SS consumes approximately 15-20 mA active (with USB enabled). With deep-sleep at ~20 nA, the average current for a periodic sensor-logging application is dominated by the active duty cycle. For USB suspend compliance, total current must drop below 2.5 mA on a USB bus-powered device within 10 ms of suspend - implement nanoWatt XLP mode with RTCC wake.
Compliance Information
RoHS and REACH compliant per Microchip product page. Lead-free matte-tin plating. Not AEC-Q100 qualified - choose PIC18 J-series AEC-Q100 variants (E suffix) for automotive. Halogen-free per Microchip environmental compliance documentation.
