PIC18F4680-H/ML Equivalent & Substitute Parts

Part Overview

The PIC18F4680-H/ML is an 8-bit microcontroller from Microchip Technology's PIC® 18F series, featuring 64KB FLASH program memory, 3.25KB RAM, and 1KB EEPROM. This device integrates CANbus, I2C, SPI, and UART/USART connectivity with 36 I/O pins and operates at 25MHz across an extended temperature range of -40°C to 150°C. The PIC18F4680-H/ML is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. The primary substitute maintains identical core functionality while offering different packaging and availability status.

Key Parameters

Parameter	Value
Core Processor	PIC
Core Size	8-Bit
Speed	25MHz
Program Memory Size	64KB (32K x 16)
Program Memory Type	FLASH
EEPROM Size	1K x 8
RAM Size	3.25K x 8
Number of I/O	36
Voltage Supply (Vcc/Vdd)	4.2V ~ 5.5V
Data Converters	A/D 11x10b
Connectivity	CANbus, I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Operating Temperature	-40°C ~ 150°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PIC18F4680-H/ML is based on maintaining electrical and functional equivalence across the following critical parameters:

Core Architecture: Both parts use the PIC core processor with identical 8-bit architecture
Memory Configuration: Identical program memory (64KB FLASH), EEPROM (1K x 8), and RAM (3.25K x 8)
Performance Specifications: Matching 25MHz clock speed and operating temperature range (-40°C to 150°C)
Functional Features: Identical connectivity (CANbus, I2C, SPI, UART/USART) and peripheral set (Brown-out Detect/Reset, HLVD, POR, PWM, WDT)
I/O Configuration: Same 36 I/O pin count
Voltage Specifications: Identical supply voltage range (4.2V ~ 5.5V)
Compliance: Both ROHS3 compliant with matching REACH and ECCN classifications

The primary difference between the main part and its substitute is the package type and associated moisture sensitivity level, which affects handling and storage requirements but not electrical functionality.

Parameter Comparison

Parameter	PIC18F4680-H/ML	PIC18F4680-H/PT
Manufacturer	Microchip Technology	Microchip Technology
Base Product Number	PIC18F4680	PIC18F4680
Series	PIC® 18F	PIC® 18F
Core Processor	PIC	PIC
Core Size	8-Bit	8-Bit
Speed	25MHz	25MHz
Program Memory Size	64KB (32K x 16)	64KB (32K x 16)
Program Memory Type	FLASH	FLASH
EEPROM Size	1K x 8	1K x 8
RAM Size	3.25K x 8	3.25K x 8
Number of I/O	36	36
Voltage Supply (Vcc/Vdd)	4.2V ~ 5.5V	4.2V ~ 5.5V
Data Converters	A/D 11x10b	A/D 11x10b
Connectivity	CANbus, I2C, SPI, UART/USART	CANbus, I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, HLVD, POR, PWM, WDT	Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Operating Temperature	-40°C ~ 150°C (TA)	-40°C ~ 150°C (TA)
Mounting Type	Surface Mount	Surface Mount
Supplier Device Package	44-QFN (8x8)	44-TQFP (10x10)
Package / Case	44-VQFN Exposed Pad	44-TQFP
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	3A001A2A	3A001A2A
HTSUS	8542.31.0001	8542.31.0001

Engineering Selection Recommendations

The PIC18F4680-H/PT serves as the primary substitute for the obsolete PIC18F4680-H/ML. Selection between these parts is determined by package and handling requirements rather than electrical performance.

PIC18F4680-H/ML (44-QFN): Suitable for applications where the smaller footprint (8x8mm) is advantageous and MSL 1 handling (unlimited shelf life) is preferred. This part is obsolete and availability is limited to existing inventory.

PIC18F4680-H/PT (44-TQFP): Recommended for new designs and ongoing production. This part maintains active product status with current manufacturing support. The 44-TQFP package (10x10mm) is larger but offers standard through-hole compatibility in certain assembly processes. MSL 3 classification requires controlled storage conditions (168-hour maximum exposure at 30°C/60% RH before reflow).

Both parts carry identical ROHS3 compliance, REACH unaffected status, and ECCN classification, ensuring regulatory equivalence for export and environmental compliance purposes.

Frequently Asked Questions (FAQ)

Q: Are the PIC18F4680-H/ML and PIC18F4680-H/PT electrically identical?

A: Yes. Both parts share identical core architecture, memory configuration, clock speed, I/O count, voltage specifications, and peripheral functionality. Electrical performance and firmware compatibility are equivalent.

Q: What is the primary difference between these two parts?

A: The main difference is package type. The PIC18F4680-H/ML uses a 44-QFN (8x8mm) package, while the PIC18F4680-H/PT uses a 44-TQFP (10x10mm) package. This affects PCB layout, assembly process, and moisture sensitivity handling.

Q: Can I use PIC18F4680-H/PT as a direct replacement for PIC18F4680-H/ML?

A: Direct PCB replacement is not possible due to different package footprints. However, the electrical functionality is identical, so firmware and circuit design remain unchanged. PCB redesign is required to accommodate the different package geometry.

Q: What does MSL 3 (168 Hours) mean for the PIC18F4680-H/PT?

A: MSL 3 indicates the part must be reflowed within 168 hours of exposure to 30°C and 60% relative humidity. Exceeding this window requires baking the component at 125°C for 24 hours to restore moisture absorption capacity. MSL 1 (unlimited) for the PIC18F4680-H/ML has no such time restriction.

Q: Why is the PIC18F4680-H/ML listed as obsolete?

A: Microchip Technology has discontinued the 44-QFN variant in favor of the 44-TQFP package. The PIC18F4680-H/PT remains in active production and is the recommended part for new designs.

Q: Are there any compliance differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and share identical ECCN (3A001A2A) and HTSUS (8542.31.0001) classifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message