PIC18LF4439-I/P Equivalent & Substitute Parts

Part Overview

The PIC18LF4439-I/P is an 8-bit microcontroller from Microchip Technology's PIC® 18F series, featuring 12KB of FLASH program memory, 640 bytes of RAM, and 256 bytes of EEPROM. This device operates at 40MHz with a supply voltage range of 2V to 5.5V and includes integrated peripherals such as I2C, SPI, UART/USART connectivity, PWM, watchdog timer, and brown-out detection. The PIC18LF4439-I/P is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

PIC18LF4439-I/P

Microchip TechnologyIn Stock: 1037PIC18LF4439-I/P Datasheet

Current PartRFQ

PIC18LF4431-I/P

Microchip TechnologyIn Stock: 2321PIC18LF4431-I/P Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The PIC18LF4431-I/P qualifies as a direct substitute for the PIC18LF4439-I/P based on the following alignment of critical parameters:

Matching Parameters:

• Core Processor: PIC (identical architecture)
• Core Size: 8-Bit (identical instruction set compatibility)
• Speed: 40MHz (identical clock frequency)
• Voltage Supply: 2V ~ 5.5V (identical operating range)
• Connectivity: I2C, SPI, UART/USART (identical communication interfaces)
• Mounting Type: Through Hole (identical physical mounting)
• Package: 40-DIP (0.600", 15.24mm) (identical footprint and pin count)
• Operating Temperature: -40°C ~ 85°C (identical thermal range)
• RoHS Status: ROHS3 Compliant (identical compliance)

Enhanced Specifications in Substitute: The PIC18LF4431-I/P provides increased program memory (16KB vs. 12KB), additional I/O pins (36 vs. 32), expanded RAM (768 x 8 vs. 640 x 8), and enhanced analog capabilities (A/D 9x10b vs. 8x10b). These enhancements maintain full backward compatibility while offering additional design headroom.

Parameter Comparison

Engineering Selection Recommendations

The PIC18LF4431-I/P is the active production equivalent for the obsolete PIC18LF4439-I/P. Both devices maintain identical electrical and mechanical compatibility across all critical parameters: core architecture, clock frequency, supply voltage range, communication interfaces, package footprint, and thermal operating range. The PIC18LF4431-I/P carries active product status from Microchip Technology, ensuring ongoing availability and support.

Both parts maintain ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements. The PIC18LF4431-I/P provides enhanced memory and I/O resources while preserving full backward compatibility with existing designs based on the PIC18LF4439-I/P.

Frequently Asked Questions (FAQ)

Q: Can the PIC18LF4431-I/P directly replace the PIC18LF4439-I/P in existing designs?

A: Yes. Both devices share identical core architecture, clock frequency, supply voltage range, communication interfaces (I2C, SPI, UART/USART), and 40-DIP package footprint. Pin-to-pin compatibility is maintained across all functional I/O.

Q: What are the key differences between these two parts?

A: The PIC18LF4431-I/P provides increased program memory (16KB vs. 12KB), additional I/O pins (36 vs. 32), expanded RAM (768 x 8 vs. 640 x 8), and enhanced analog-to-digital conversion capability (9x10b vs. 8x10b). These enhancements do not affect compatibility with designs targeting the PIC18LF4439-I/P.

Q: Why is the PIC18LF4439-I/P classified as obsolete?

A: The PIC18LF4439-I/P has been discontinued by Microchip Technology. The PIC18LF4431-I/P serves as the active production alternative, offering equivalent functionality with enhanced specifications.

Q: Are there any package or mounting differences?

A: No. Both devices use identical 40-DIP through-hole packaging with 0.600" (15.24mm) body width. PCB footprints and mounting requirements are identical.

Q: Do both parts meet current compliance standards?

A: Yes. Both the PIC18LF4439-I/P and PIC18LF4431-I/P are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.

Q: What is the operating temperature range for both devices?

A: Both devices operate across -40°C to 85°C (TA), providing identical thermal performance specifications.