PIC18F4331T-I/ML Equivalent & Substitute Parts

Part Overview

The PIC18F4331T-I/ML is an 8-bit microcontroller from Microchip Technology's PIC® 18F series, featuring 8KB of FLASH program memory, 768 bytes of RAM, and 256 bytes of EEPROM. This device integrates multiple communication interfaces (I2C, SPI, UART/USART) and peripheral functions including PWM, QEI, brown-out detection, and watchdog timer capabilities. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

PIC18F4331T-I/ML

Microchip TechnologyIn Stock: 987PIC18F4331T-I/ML Datasheet

Current PartRFQ

PIC18F4331-I/ML

Microchip TechnologyIn Stock: 1664PIC18F4331-I/ML Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC18F4331T-I/ML is based on strict equivalence across all electrical and mechanical parameters. The primary substitute identified is the PIC18F4331-I/ML, which maintains identical specifications across core processor architecture, memory configuration, I/O count, connectivity interfaces, peripheral functions, voltage supply range, operating temperature range, and physical packaging. Both parts are based on the same base product number (PIC18F4331) and share the 44-VQFN Exposed Pad package format.

The key parameters determining substitution eligibility are:

• Core processor type and architecture (PIC 8-bit)
• Program memory capacity and type (8KB FLASH)
• RAM and EEPROM sizes (768 x 8 and 256 x 8 respectively)
• Operating voltage range (4.2V ~ 5.5V)
• I/O pin count (36)
• Communication interfaces (I2C, SPI, UART/USART)
• Physical package format (44-VQFN Exposed Pad)

Parameter Comparison

Engineering Selection Recommendations

The PIC18F4331-I/ML is the direct substitute for the obsolete PIC18F4331T-I/ML. Both parts are manufactured by Microchip Technology and share identical electrical specifications and physical packaging. The primary distinction is product status: the PIC18F4331T-I/ML is classified as obsolete, while the PIC18F4331-I/ML maintains active product status with verified programmability support.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for current production environments. The PIC18F4331-I/ML is supplied in tube packaging and has confirmed availability in stock, making it suitable for immediate design transitions from the obsolete variant.

Frequently Asked Questions (FAQ)

Q: Are the PIC18F4331T-I/ML and PIC18F4331-I/ML electrically identical?

A: Yes. Both parts share identical core processor architecture, memory configuration (8KB FLASH, 768 bytes RAM, 256 bytes EEPROM), I/O count (36 pins), operating voltage range (4.2V ~ 5.5V), speed (40MHz), and peripheral functions. Electrical performance and pin functionality are equivalent.

Q: What is the difference between these two part numbers?

A: The primary difference is product lifecycle status. The PIC18F4331T-I/ML is obsolete, while the PIC18F4331-I/ML is active. The substitute part also differs in packaging format (tube versus unspecified for the main part) and has verified programmability support.

Q: Can I use the PIC18F4331-I/ML as a direct replacement in existing designs?

A: Yes. The PIC18F4331-I/ML is a direct substitute. Both parts use the 44-VQFN Exposed Pad package with identical pin assignments, electrical characteristics, and peripheral configurations. No circuit modifications are required.

Q: Are there any compliance or certification differences?

A: No. Both parts maintain ROHS3 compliance and REACH unaffected status. Regulatory certifications are equivalent.

Q: What is the availability status of the substitute part?

A: The PIC18F4331-I/ML is classified as active product with 1620 pieces in stock, ensuring supply continuity for new designs and production requirements.