---
title: Device Overview
slug: docs-preview
docTags: 
createdAt: 2026-06-29T07:12:12.092Z
---

The PIC18F2455/2550/4455/4550 family provides high‑performance 8‑bit microcontrollers with Enhanced Flash memory, USB support, nanoWatt power-saving modes, and a wide range of oscillator options.

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## Using the PIC Microcontroller

### Power‑Saving with nanoWatt Technology

- Alternate Run Modes reduce power consumption by up to 90%.
- Idle Modes allow peripheral operation while the CPU is disabled.
- On‑the‑fly switching supports dynamic power optimization.

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## Using the PIC Microcontroller

### Power‑Saving with nanoWatt Technology

- Alternate Run Modes reduce power consumption by up to 90%.
- Idle Modes allow peripheral operation while the CPU is disabled.
- On‑the‑fly switching supports dynamic power optimization.
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## Key Features Summary

***

| Feature                | PIC18F2455  | PIC18F2550  | PIC18F4455  | PIC18F4550  |
| ---------------------- | ----------- | ----------- | ----------- | ----------- |
| Operating Frequency    | DC – 48 MHz | DC – 48 MHz | DC – 48 MHz | DC – 48 MHz |
| Program Memory (Bytes) | 24576       | 32768       | 24576       | 32768       |
| Data EEPROM (Bytes)    | 256         | 256         | 256         | 256         |
| Interrupt Sources      | 19          | 19          | 20          | 20          |
| I/O Ports              | A,B,C,(E)   | A,B,C,(E)   | A,B,C,D,E   | A,B,C,D,E   |

***

## Special Modules

***

| Module               | Description                                                             |
| -------------------- | ----------------------------------------------------------------------- |
| nanoWatt Technology  | Low‑power modes, on‑the‑fly switching, and reduced power consumption    |
| USB Module           | USB 2.0 compliant, full‑speed/low‑speed support, integrated transceiver |
| Oscillator Options   | 12 modes, PLL up to 48 MHz, internal oscillator with fail‑safe support  |
| 10‑bit A/D Converter | Up to 13 channels with programmable acquisition time                    |
| Enhanced CCP         | PWM with auto‑shutdown/restart and multiple outputs                     |

***

## Package Comparison Table

***

| Package          | Pin Count | Available Ports | A/D Channels |
| ---------------- | --------- | --------------- | ------------ |
| 28-Pin PDIP/SOIC | 28        | A,B,C,(E)       | 10           |
| 40-Pin PDIP      | 40        | A,B,C,D,E       | 13           |
| 44-Pin QFN/TQFP  | 44        | A,B,C,D,E       | 13           |

***

## Memory Summary Table

***

| Memory Type   | Size            | Endurance        | Notes                     |
| ------------- | --------------- | ---------------- | ------------------------- |
| Program Flash | 24K / 32K bytes | 100,000 cycles   | Enhanced Flash            |
| Data EEPROM   | 256 bytes       | 1,000,000 cycles | Long retention > 40 years |
| Data RAM      | 2048 bytes      | N/A              | Shared across modules     |

***

## Using the PIC Microcontroller

### Power‑Saving with nanoWatt Technology

- Alternate Run Modes reduce power consumption by up to 90%.
- Idle Modes allow peripheral operation while the CPU is disabled.
- On‑the‑fly switching supports dynamic power optimization.

### USB Features

- USB 2.0 compliant module.
- Supports low‑speed and full‑speed USB operation.
- Includes an integrated transceiver and voltage regulator.

### Oscillator System

- Supports an internal oscillator block with an 8 MHz base frequency.
- PLL operation supports clock speeds up to 48 MHz.
- Fail‑Safe Clock Monitor enhances operational reliability.

### Memory System

- Enhanced Flash rated for up to 100,000 write cycles.
- EEPROM rated for up to 1,000,000 write cycles.
- Supports self‑programming and bootloader implementations.

### Analog/Digital Features

- Up to 13 A/D channels, depending on package type.
- Programmable acquisition timing support.

### Communication Modules

- Enhanced USART with automatic baud rate detection.
- MSSP support for SPI and I²C communication.

## Packages Available

- 28‑Pin PDIP/SOIC
- 40‑Pin PDIP
- 44‑Pin QFN/TQFP

## Application Use Cases

- USB peripherals
- Low‑power devices
- Embedded control systems
- Sensor interfacing applications