PIC18F4439-I/P Equivalent & Substitute Parts

Part Overview

The PIC18F4439-I/P is an 8-bit microcontroller from Microchip Technology's PIC® 18F series, designed for embedded applications requiring moderate program memory capacity. This device features 12KB of FLASH program memory, 640 bytes of RAM, and integrated peripherals including I2C, SPI, and UART/USART connectivity. The part is currently in active production status with 779 units available in new original stock. Substitute parts are identified when design requirements allow for increased memory capacity or enhanced peripheral functionality while maintaining core electrical and mechanical compatibility.

Substiute Parts

PIC18F4439-I/P

Microchip TechnologyIn Stock: 815PIC18F4439-I/P Datasheet

Current PartRFQ

PIC18F4431-I/P

Microchip TechnologyIn Stock: 2866PIC18F4431-I/P Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The PIC18F4431-I/P qualifies as a direct substitute based on the following alignment of critical parameters:

Electrical Compatibility:

• Identical core processor architecture (PIC)
• Identical core size (8-Bit)
• Identical maximum speed (40MHz)
• Identical voltage supply range (4.2V ~ 5.5V)
• Identical operating temperature range (-40°C ~ 85°C)
• Identical data converter specification (A/D 10-bit)
• Identical oscillator type (Internal)
• Identical connectivity interfaces (I2C, SPI, UART/USART)

Mechanical Compatibility:

• Identical mounting type (Through Hole)
• Identical package type (40-DIP)
• Identical package dimensions (0.600", 15.24mm)

Regulatory Compliance:

• Identical RoHS status (ROHS3 Compliant)
• Identical REACH status (REACH Unaffected)
• Identical ECCN classification (3A991A2)
• Identical HTSUS code (8542.31.0001)
• Identical moisture sensitivity level (MSL 1 - Unlimited)

The PIC18F4431-I/P provides enhanced memory capacity (16KB program memory versus 12KB) and additional I/O pins (36 versus 32), making it suitable for applications requiring expanded functionality within the same physical and electrical constraints.

Parameter Comparison

Engineering Selection Recommendations

Both the PIC18F4439-I/P and PIC18F4431-I/P maintain active product status from Microchip Technology, ensuring continued availability and support. Both devices are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

The PIC18F4431-I/P is suitable for applications where the original PIC18F4439-I/P is specified, provided that the design accommodates the increased program memory (16KB versus 12KB), additional RAM (768 bytes versus 640 bytes), additional I/O pins (36 versus 32), and one additional A/D converter channel (9 versus 8). No design modifications are required for power supply, thermal management, or package footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can the PIC18F4431-I/P be used as a direct replacement for the PIC18F4439-I/P?

A: Yes. Both devices share identical electrical specifications for core processor, speed, voltage supply range, operating temperature, and package dimensions. The PIC18F4431-I/P provides additional program memory and I/O capacity without requiring changes to power supply, thermal design, or PCB layout.

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

A: The PIC18F4431-I/P provides 16KB program memory compared to 12KB in the PIC18F4439-I/P, 768 bytes of RAM versus 640 bytes, 36 I/O pins versus 32, and 9 A/D converter channels versus 8. All other electrical and mechanical parameters are identical.

Q: Are there any package or pinout differences?

A: Both devices use the 40-DIP package with identical dimensions (0.600", 15.24mm). The additional I/O pins in the PIC18F4431-I/P are accommodated within the same package footprint.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the PIC18F4439-I/P and PIC18F4431-I/P are ROHS3 compliant, REACH unaffected, and carry identical ECCN and HTSUS classifications.

Q: What is the moisture sensitivity level for both parts?

A: Both devices have a moisture sensitivity level of 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.