PIC18F4331T-I/PT Equivalent & Substitute Parts

Part Overview

The PIC18F4331T-I/PT is an 8-bit microcontroller from Microchip Technology's PIC® 18F series, designed for embedded applications requiring moderate processing capability and integrated peripherals. This device operates at 40MHz with 8KB of FLASH program memory and includes integrated communication interfaces (I2C, SPI, UART/USART) and control peripherals (PWM, QEI, WDT). The part is currently in active production status with ROHS3 compliance and REACH unaffected designation. Identifying equivalent substitute parts is necessary when the primary part number becomes unavailable or when alternative packaging configurations are required for supply chain optimization.

Key Parameters

Parameter	Value
Core Processor	PIC
Core Size	8-Bit
Speed	40MHz
Program Memory Size	8KB (4K x 16)
Program Memory Type	FLASH
EEPROM Size	256 x 8
RAM Size	768 x 8
Number of I/O	36
Voltage Supply (Vcc/Vdd)	4.2V ~ 5.5V
Data Converters	A/D 9x10b
Connectivity	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, LVD, Power Control PWM, QEI, POR, PWM, WDT
Mounting Type	Surface Mount
Package / Case	44-TQFP (10x10)
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the PIC18F4331T-I/PT is determined by strict equivalence across the following critical parameters:

Core architecture and processing capability: PIC 8-bit processor at 40MHz Memory configuration: 8KB FLASH program memory, 256 x 8 EEPROM, 768 x 8 RAM I/O and peripheral set: 36 I/O pins with I2C, SPI, UART/USART connectivity and integrated PWM, QEI, WDT functions Electrical specifications: 4.2V to 5.5V supply voltage range, A/D converter with 9x10-bit resolution Physical form factor: 44-TQFP surface mount package (10x10mm) Compliance and environmental ratings: ROHS3 compliance, MSL 3 rating, operating range -40°C to 85°C

The substitute part PIC18F4331-I/PT maintains identical electrical, functional, and mechanical specifications. The primary difference is packaging configuration (Tray versus the original specification), which does not affect electrical performance or pin compatibility.

Parameter Comparison

Parameter	PIC18F4331T-I/PT (Main)	PIC18F4331-I/PT (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Series	PIC® 18F	PIC® 18F
Core Processor	PIC	PIC
Core Size	8-Bit	8-Bit
Speed	40MHz	40MHz
Program Memory Size	8KB (4K x 16)	8KB (4K x 16)
Program Memory Type	FLASH	FLASH
EEPROM Size	256 x 8	256 x 8
RAM Size	768 x 8	768 x 8
Number of I/O	36	36
Voltage Supply (Vcc/Vdd)	4.2V ~ 5.5V	4.2V ~ 5.5V
Data Converters	A/D 9x10b	A/D 9x10b
Connectivity	I2C, SPI, UART/USART	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, LVD, Power Control PWM, QEI, POR, PWM, WDT	Brown-out Detect/Reset, LVD, Power Control PWM, QEI, POR, PWM, WDT
Mounting Type	Surface Mount	Surface Mount
Package / Case	44-TQFP (10x10)	44-TQFP (10x10)
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Active	Active

Engineering Selection Recommendations

Both the PIC18F4331T-I/PT and PIC18F4331-I/PT are active production parts from Microchip Technology with identical electrical and functional specifications. Selection between these parts should be based on packaging and supply requirements:

PIC18F4331T-I/PT is specified with standard packaging configuration suitable for general procurement workflows.

PIC18F4331-I/PT is supplied in Tray packaging, offering alternative logistics handling for high-volume applications or specific supply chain requirements.

Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for industrial and commercial applications. The MSL 3 rating (168 hours) applies to both variants, requiring standard moisture control during storage and handling.

Frequently Asked Questions (FAQ)

Q: Are PIC18F4331T-I/PT and PIC18F4331-I/PT pin-compatible? A: Yes. Both parts use the 44-TQFP (10x10mm) package with identical pin assignments, I/O configuration (36 pins), and electrical characteristics. Direct substitution on PCB layouts is supported without design modification.

Q: What is the difference between these two part numbers? A: The primary difference is packaging configuration. PIC18F4331T-I/PT uses standard packaging, while PIC18F4331-I/PT is supplied in Tray format. All electrical, functional, and performance specifications are identical.

Q: Can I use PIC18F4331-I/PT as a direct replacement in production? A: Yes. The substitute part maintains identical core specifications, memory configuration, peripheral set, voltage supply range, and operating temperature range. No firmware or hardware modifications are required.

Q: Are there any compliance or certification differences? A: No. Both parts carry ROHS3 compliance and REACH unaffected designation. MSL 3 moisture sensitivity rating applies to both variants.

Q: What memory specifications should I verify for compatibility? A: Both parts feature 8KB FLASH program memory (4K x 16), 256 x 8 EEPROM, and 768 x 8 RAM. These specifications are identical and do not require verification for substitution.

Q: Are the communication interfaces identical? A: Yes. Both parts include I2C, SPI, and UART/USART connectivity with identical peripheral support (PWM, QEI, WDT, Brown-out Detect/Reset, LVD, POR).

Q: What is the operating voltage range for both parts? A: Both parts operate within 4.2V to 5.5V supply voltage range with identical electrical characteristics across this range.

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