PIC18F4450T-I/ML Equivalent & Substitute Parts

Part Overview

The PIC18F4450T-I/ML is an 8-bit microcontroller from Microchip Technology's PIC® 18F series, featuring 16KB FLASH program memory, 768 x 8 RAM, and integrated USB connectivity. Designed for embedded applications requiring real-time processing and peripheral integration, this device operates at 48MHz with a 44-QFN package footprint.

The main part number PIC18F4450T-I/ML carries an Obsolete product status. Locating equivalent or substitute components becomes necessary when original stock is depleted or when design flexibility allows for active-status alternatives that maintain full electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Core Processor	PIC
Core Size	8-Bit
Speed	48MHz
Program Memory Size	16KB (8K x 16)
Program Memory Type	FLASH
RAM Size	768 x 8
Voltage - Supply (Vcc/Vdd)	4.2V ~ 5.5V
Data Converters	A/D 13x10b
Number of I/O	34
Connectivity	UART/USART, USB
Peripherals	Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	44-VQFN Exposed Pad
Supplier Device Package	44-QFN (8x8)

Substitute Part Grouping Explanation

Substitution eligibility for the PIC18F4450T-I/ML is determined by strict equivalence across the following critical parameters:

Core Processor Architecture: PIC processor family
Memory Configuration: 16KB FLASH program memory (8K x 16), 768 x 8 RAM
Operating Frequency: 48MHz
Voltage Supply Range: 4.2V ~ 5.5V
Package Footprint: 44-QFN (8x8) with exposed pad
I/O Count: 34 pins
Connectivity Interfaces: UART/USART and USB support
Peripheral Feature Set: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Data Conversion Capability: 13-channel 10-bit A/D converter

The substitute part PIC18F4450-I/ML maintains identical electrical specifications, memory architecture, pin configuration, and functional capabilities. The primary distinction is product status: the substitute carries Active status, ensuring continued availability and manufacturing support.

Parameter Comparison

Parameter	PIC18F4450T-I/ML (Main)	PIC18F4450-I/ML (Substitute)	Match
Manufacturer	Microchip Technology	Microchip Technology	✓
Series	PIC® 18F	PIC® 18F	✓
Core Processor	PIC	PIC	✓
Core Size	8-Bit	8-Bit	✓
Speed	48MHz	48MHz	✓
Program Memory Size	16KB (8K x 16)	16KB (8K x 16)	✓
Program Memory Type	FLASH	FLASH	✓
RAM Size	768 x 8	768 x 8	✓
Voltage - Supply (Vcc/Vdd)	4.2V ~ 5.5V	4.2V ~ 5.5V	✓
Data Converters	A/D 13x10b	A/D 13x10b	✓
Number of I/O	34	34	✓
Connectivity	UART/USART, USB	UART/USART, USB	✓
Peripherals	Brown-out Detect/Reset, HLVD, POR, PWM, WDT	Brown-out Detect/Reset, HLVD, POR, PWM, WDT	✓
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	✓
Mounting Type	Surface Mount	Surface Mount	✓
Package / Case	44-VQFN Exposed Pad	44-VQFN Exposed Pad	✓
Supplier Device Package	44-QFN (8x8)	44-QFN (8x8)	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
REACH Status	REACH Unaffected	REACH Unaffected	✓
Product Status	Obsolete	Active	Different

Engineering Selection Recommendations

The PIC18F4450-I/ML qualifies as a direct substitute for the PIC18F4450T-I/ML based on complete electrical and mechanical equivalence. All functional parameters, memory specifications, pin configurations, and operating characteristics are identical.

The substitute part carries Active product status from Microchip Technology, ensuring ongoing manufacturing support, availability, and compliance with current regulatory requirements. Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory obligations.

The packaging difference (Tube for the substitute versus unspecified for the main part) does not affect electrical or mechanical compatibility and represents a logistics consideration only.

Frequently Asked Questions (FAQ)

Q: Can PIC18F4450-I/ML be used as a direct replacement for PIC18F4450T-I/ML in existing designs?

A: Yes. Both parts share identical core processor architecture, memory configuration, operating frequency, voltage supply range, pin count, package footprint, and peripheral feature set. No design modifications are required.

Q: What is the significance of the product status difference?

A: The main part (PIC18F4450T-I/ML) carries Obsolete status, indicating discontinued manufacturing. The substitute (PIC18F4450-I/ML) carries Active status, confirming current production and long-term availability from Microchip Technology.

Q: Are the 44-QFN (8x8) packages mechanically identical?

A: Yes. Both parts use the 44-VQFN Exposed Pad package with identical footprint dimensions, pin spacing, and mounting requirements. PCB layout and assembly processes remain unchanged.

Q: Do compliance certifications differ between the two parts?

A: No. Both parts maintain ROHS3 compliance and REACH unaffected status. Regulatory and environmental requirements are satisfied by either part.

Q: What is the inventory status of each part?

A: The main part (PIC18F4450T-I/ML) shows 1151 pieces in stock. The substitute (PIC18F4450-I/ML) shows 827 pieces in stock. Both are available as new original components.

Q: Is there any difference in the 44-QFN package specification?

A: No. The Supplier Device Package designation (44-QFN 8x8) and Package/Case specification (44-VQFN Exposed Pad) are identical for both parts.

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