PIC17LC44-08I/P Equivalent & Substitute Parts

Part Overview

The PIC17LC44-08I/P is an 8-bit microcontroller from Microchip Technology's PIC® 17C series, featuring 16KB OTP program memory and operating at 8MHz. This device is classified as Active product status and is suitable for embedded applications requiring one-time programmable memory. Substitute parts are identified when equivalent functional requirements can be met through alternative microcontroller models that maintain compatibility in core processor architecture, memory capacity, I/O count, package format, and operating specifications.

Substiute Parts

PIC17LC44-08I/P

Microchip TechnologyIn Stock: 926PIC17LC44-08I/P Datasheet

Current PartRFQ

PIC18F4420-I/P

Microchip TechnologyIn Stock: 2471PIC18F4420-I/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PIC17LC44-08I/P is determined by the following critical parameters:

• Core Processor Architecture: Must be PIC family to ensure instruction set compatibility
• Core Size: Must remain 8-Bit
• Program Memory Capacity: Must be 16KB (8K x 16) minimum
• Package Format: Must be 40-DIP (0.600", 15.24mm) for mechanical and electrical pin compatibility
• Mounting Type: Must be Through Hole
• Operating Temperature Range: Must support -40°C ~ 85°C (TA)
• Voltage Supply Range: Must accommodate the specified Vcc/Vdd range or be compatible with system design constraints

The PIC18F4420-I/P qualifies as a substitute based on matching core processor family, 8-bit architecture, 16KB program memory, identical 40-DIP package, through-hole mounting, and overlapping operating temperature specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the PIC17LC44-08I/P and PIC18F4420-I/P maintain Active product status from Microchip Technology and are ROHS3 Compliant. The PIC18F4420-I/P offers enhanced capabilities including FLASH memory (versus OTP), higher processing speed (40MHz versus 8MHz), expanded RAM (768 x 8 versus 454 x 8), additional I/O pins (36 versus 33), and extended peripheral support (I2C and SPI connectivity). The voltage supply range for the PIC18F4420-I/P is narrower (4.2V ~ 5.5V versus 2.5V ~ 6V), which must be evaluated against system power supply specifications. Both devices share identical 40-DIP packaging and operating temperature range, ensuring mechanical and thermal compatibility.

Frequently Asked Questions (FAQ)

Q: Can the PIC18F4420-I/P directly replace the PIC17LC44-08I/P in existing designs?

A: Direct pin-for-pin replacement is possible due to identical 40-DIP packaging. However, the voltage supply range difference (4.2V ~ 5.5V for PIC18F4420-I/P versus 2.5V ~ 6V for PIC17LC44-08I/P) must be verified against your system power supply. Additionally, firmware may require modification to utilize the enhanced instruction set and peripherals of the PIC18F series.

Q: What are the key differences in memory technology?

A: The PIC17LC44-08I/P uses OTP (One-Time Programmable) memory, while the PIC18F4420-I/P uses FLASH memory. FLASH memory allows multiple reprogramming cycles, whereas OTP memory can only be programmed once. This distinction affects development workflows and field updates.

Q: Are the I/O pin counts compatible?

A: The PIC17LC44-08I/P provides 33 I/O pins, while the PIC18F4420-I/P provides 36 I/O pins. Both devices use the same 40-DIP package format. The additional I/O pins on the PIC18F4420-I/P do not create incompatibility; however, designs utilizing all 33 pins of the original device will have 3 additional available pins on the substitute.

Q: What connectivity options differ between these devices?

A: The PIC17LC44-08I/P includes UART/USART connectivity. The PIC18F4420-I/P expands this with I2C and SPI support, providing additional communication protocol options for system integration.

Q: How do the processing speeds affect substitution?

A: The PIC18F4420-I/P operates at 40MHz compared to the PIC17LC44-08I/P at 8MHz. This 5x speed increase enables faster instruction execution and may allow for reduced clock frequency in timing-sensitive applications, potentially reducing power consumption or improving real-time performance.