PIC17C44-25I/PQ Equivalent & Substitute Parts

Part Overview

The PIC17C44-25I/PQ is an 8-bit microcontroller from Microchip Technology's PIC® 17C series, featuring 16KB OTP program memory and operating at 25MHz. This device is classified as Active product status and remains in production inventory with 1033 units available. Finding equivalent or substitute parts may be necessary due to application requirements for enhanced memory types, higher processing speeds, expanded I/O capabilities, or improved peripheral integration compared to the original OTP-based architecture.

Key Parameters

Parameter	Value
Core Processor	PIC
Core Size	8-Bit
Program Memory Size	16KB (8K x 16)
Program Memory Type	OTP
Speed	25MHz
Operating Temperature	-40°C ~ 85°C (TA)
Voltage - Supply (Vcc/Vdd)	4.5V ~ 6V
Package / Case	44-QFP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

The PIC18F4420-I/PT qualifies as a manufacturer-recommended substitute based on the following alignment criteria:

Core Architecture Compatibility: Both devices utilize the PIC core processor architecture and maintain 8-bit core size, ensuring instruction set compatibility and software portability.

Memory Configuration: Both parts provide 16KB (8K x 16) program memory capacity, meeting identical memory footprint requirements. The substitute upgrades from OTP to FLASH memory type, enabling in-circuit reprogramming capability.

Package Compatibility: Both devices are housed in 44-pin QFP packages (44-TQFP vs. 44-QFP), maintaining identical pin counts and surface mount compatibility for PCB integration.

Operating Environment: Both parts support overlapping operating temperature ranges (-40°C ~ 85°C) and comply with ROHS3 and REACH standards, ensuring equivalent environmental and regulatory compliance.

Electrical Specifications: Supply voltage ranges are compatible (4.5V ~ 6V for PIC17C44-25I/PQ overlaps with 4.2V ~ 5.5V for PIC18F4420-I/PT), allowing direct substitution in power supply designs.

Parameter Comparison

Parameter	PIC17C44-25I/PQ	PIC18F4420-I/PT
Manufacturer	Microchip Technology	Microchip Technology
Series	PIC® 17C	PIC® 18F
Core Processor	PIC	PIC
Core Size	8-Bit	8-Bit
Speed	25MHz	40MHz
Program Memory Size	16KB (8K x 16)	16KB (8K x 16)
Program Memory Type	OTP	FLASH
RAM Size	454 x 8	768 x 8
EEPROM Size	—	256 x 8
Number of I/O	33	36
Connectivity	UART/USART	I2C, SPI, UART/USART
Peripherals	POR, PWM, WDT	Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Voltage - Supply (Vcc/Vdd)	4.5V ~ 6V	4.2V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	44-QFP	44-TQFP
Mounting Type	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active

Engineering Selection Recommendations

Selection between PIC17C44-25I/PQ and PIC18F4420-I/PT should be based on the following engineering criteria:

PIC17C44-25I/PQ is appropriate for applications where OTP memory is acceptable and cost optimization is prioritized. This device maintains Active product status with established supply availability (1033 units in stock).

PIC18F4420-I/PT is the manufacturer-recommended substitute when FLASH memory reprogramming capability is required, higher processing speed (40MHz vs. 25MHz) benefits application performance, expanded RAM (768 x 8 vs. 454 x 8) supports larger data structures, or additional peripherals (I2C, SPI, Brown-out Detect, HLVD) are necessary for system functionality. This device is verified as programmable and maintains Active product status with higher inventory availability (2700 units in stock).

Both devices maintain identical compliance certifications (ROHS3 Compliant, REACH Unaffected) and equivalent operating temperature ranges, ensuring regulatory and environmental compatibility in either selection.

Frequently Asked Questions (FAQ)

Q: Can PIC18F4420-I/PT directly replace PIC17C44-25I/PQ in existing designs?

A: Direct pin-compatible replacement is possible due to identical 44-pin QFP package configuration and matching pin assignments. However, firmware validation is required to confirm compatibility with the PIC 18F instruction set and peripheral register differences.

Q: What are the primary functional differences between these devices?

A: The PIC18F4420-I/PT provides FLASH memory (vs. OTP), higher clock speed (40MHz vs. 25MHz), expanded RAM capacity (768 x 8 vs. 454 x 8), integrated EEPROM (256 x 8), additional I/O pins (36 vs. 33), and enhanced peripherals including I2C, SPI, and Brown-out Detection.

Q: Are there supply voltage compatibility concerns?

A: Supply voltage ranges overlap sufficiently for substitution. PIC17C44-25I/PQ operates at 4.5V ~ 6V while PIC18F4420-I/PT operates at 4.2V ~ 5.5V. Designs operating within 4.5V ~ 5.5V are compatible with both devices.

Q: Does package designation affect PCB layout compatibility?

A: Both devices use 44-pin QFP packages (44-QFP and 44-TQFP designations refer to the same physical form factor). PCB footprints are compatible without modification.

Q: What certifications apply to both devices?

A: Both PIC17C44-25I/PQ and PIC18F4420-I/PT are ROHS3 Compliant and REACH Unaffected, meeting equivalent environmental and regulatory requirements.

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