PIC18F448-I/L Equivalent & Substitute Parts

Part Overview

The PIC18F448-I/L is an 8-bit microcontroller from Microchip Technology's PIC® 18F series, featuring 16KB FLASH program memory, 768 bytes of RAM, and 256 bytes of EEPROM. The device integrates CANbus, I2C, SPI, and UART/USART connectivity with 33 I/O pins in a 44-PLCC package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity.

Substiute Parts

PIC18F448-I/L

Microchip TechnologyIn Stock: 2041PIC18F448-I/L Datasheet

Current PartRFQ

PIC18F4480-I/PT

Microchip TechnologyIn Stock: 2187PIC18F4480-I/PT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC18F448-I/L is based on the following core electrical and mechanical parameters:

Critical Matching Parameters:

• Core processor architecture (PIC)
• Core size (8-Bit)
• Operating speed (40MHz)
• Program memory capacity (16KB FLASH)
• RAM and EEPROM sizes (768 x 8 and 256 x 8 respectively)
• Supply voltage range (4.2V ~ 5.5V)
• Operating temperature range (-40°C ~ 85°C)
• Connectivity interfaces (CANbus, I2C, SPI, UART/USART)

Allowable Variations:

• Package type (PLCC to TQFP conversion permitted)
• Number of I/O pins (33 to 36 acceptable with package change)
• Analog-to-digital converter resolution (8x10b to 11x10b)
• Oscillator type (External to Internal)
• Product status (Obsolete to Active)

The PIC18F4480-I/PT qualifies as a direct substitute based on identical core specifications, memory configuration, and connectivity while offering improved availability through active product status.

Parameter Comparison

Engineering Selection Recommendations

The PIC18F4480-I/PT is the qualified substitute for the obsolete PIC18F448-I/L based on the following factors:

Functional Equivalence: Both devices share identical core architecture, memory configuration, operating speed, and connectivity specifications. The PIC18F4480-I/PT maintains full software compatibility with the PIC18F448-I/L instruction set.

Compliance Alignment: Both parts maintain ROHS3 compliance and identical moisture sensitivity levels (MSL 3, 168 Hours), ensuring equivalent environmental and regulatory requirements.

Availability Advantage: The PIC18F4480-I/PT holds active product status with verified programmability and current inventory availability, addressing the obsolescence of the original part.

Package Consideration: Substitution requires PCB layout modification due to the package change from 44-PLCC to 44-TQFP. Pin-to-pin compatibility is not guaranteed; schematic and layout review is necessary.

Enhanced Features: The substitute offers expanded I/O capability (36 pins versus 33) and improved analog-to-digital converter resolution (11x10b versus 8x10b), providing design flexibility without functional compromise.

Frequently Asked Questions (FAQ)

Q: Can the PIC18F4480-I/PT be used as a direct pin-for-pin replacement?

A: No. While functionally equivalent, the package change from 44-PLCC to 44-TQFP requires PCB redesign. Pin assignments differ between package types and must be verified against the respective datasheets before implementation.

Q: Are there firmware compatibility concerns when switching from PIC18F448-I/L to PIC18F4480-I/PT?

A: No. Both devices use identical PIC 18F core architecture and instruction sets. Existing firmware requires no modification for core functionality. Peripheral configuration may require adjustment based on oscillator type differences (external versus internal).

Q: What is the impact of the increased I/O count (36 versus 33 pins)?

A: The additional I/O pins in the PIC18F4480-I/PT provide expanded design flexibility. Existing designs using 33 I/O pins remain compatible; the additional pins are optional for new feature implementation.

Q: Does the enhanced A/D converter (11x10b versus 8x10b) affect compatibility?

A: No. The enhanced resolution is backward compatible. Existing code targeting 8-bit resolution operates without modification. The additional resolution is available for applications requiring improved analog measurement precision.

Q: What are the supply chain implications of using the active PIC18F4480-I/PT?

A: The active product status ensures continued manufacturing and distribution support. Current inventory availability reduces lead times compared to obsolete part sourcing through secondary markets.