PIC16LC642-04/SP Equivalent & Substitute Parts

Part Overview

The PIC16LC642-04/SP is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, designed for embedded applications requiring low-power operation. This device features 7KB of OTP (One-Time Programmable) memory, 22 I/O pins, and operates across a 3V to 6V supply range with a 4MHz clock speed. The part is currently in active production status with 741 units in stock.

Finding equivalent or substitute parts becomes necessary when OTP memory limitations require reprogramming capability, when higher clock speeds are needed for performance-critical applications, or when extended temperature ranges are required for industrial environments.

Substiute Parts

PIC16LC642-04/SP

Microchip TechnologyIn Stock: 804PIC16LC642-04/SP Datasheet

Current PartRFQ

PIC16LF72-I/SP

Microchip TechnologyIn Stock: 2133PIC16LF72-I/SP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC16LC642-04/SP is evaluated based on the following critical parameters:

Mechanical Compatibility: Package type (28-DIP), pin count (22 I/O), and mounting method (Through Hole) must remain identical to ensure direct board-level replacement without layout modifications.

Electrical Compatibility: Core processor family (PIC), core size (8-Bit), and I/O pin configuration must match. Supply voltage range and operating temperature must be equal to or broader than the original specification.

Memory Architecture: Program memory type and size determine functional equivalence. OTP memory can be substituted with FLASH memory of equal or greater capacity, as FLASH provides reprogrammability while maintaining code storage capability.

Regulatory Compliance: RoHS3 compliance and REACH status must be maintained for equivalent parts.

The PIC16LF72-I/SP qualifies as a substitute based on matching mechanical form factor, identical I/O configuration, compatible core processor family, and superior memory technology (FLASH vs. OTP).

Parameter Comparison

Engineering Selection Recommendations

PIC16LF72-I/SP as Primary Substitute:

The PIC16LF72-I/SP is the manufacturer-recommended substitute for the PIC16LC642-04/SP. Both devices maintain ROHS3 compliance and active production status, ensuring long-term availability and regulatory consistency.

The PIC16LF72-I/SP provides FLASH memory technology, enabling in-circuit reprogrammability compared to the OTP limitation of the original part. This represents a functional upgrade while maintaining identical mechanical and electrical pin compatibility.

The substitute operates at 20MHz versus 4MHz on the original, providing performance headroom for timing-critical applications. The extended operating temperature range (-40°C to 85°C) accommodates industrial and automotive environments beyond the original 0°C to 70°C specification.

Trade-offs include reduced program memory (4.6KB versus 7KB) and RAM (128 x 8 versus 176 x 8). Applications requiring the full 7KB program memory capacity must evaluate code optimization or alternative device selection.

Frequently Asked Questions (FAQ)

Q: Can the PIC16LF72-I/SP directly replace the PIC16LC642-04/SP on existing PCBs?

A: Yes. Both devices use identical 28-DIP packaging with matching pin assignments and I/O configuration. No PCB layout modifications are required for mechanical and electrical compatibility.

Q: What is the primary advantage of substituting to the PIC16LF72-I/SP?

A: The PIC16LF72-I/SP uses FLASH memory instead of OTP, allowing code reprogramming without device replacement. This reduces development cycle time and enables field updates.

Q: Are there memory capacity considerations when substituting?

A: The PIC16LF72-I/SP provides 4.6KB program memory compared to 7KB on the original. Applications using more than 4.6KB of program space require code optimization or alternative device selection.

Q: Does the substitute support the same supply voltage range?

A: The PIC16LF72-I/SP operates at 2V to 5.5V, which overlaps with but does not fully match the original 3V to 6V range. Applications requiring 5.5V to 6V operation must use the original PIC16LC642-04/SP or select an alternative device.

Q: What is the temperature operating range difference?

A: The PIC16LF72-I/SP extends to -40°C to 85°C versus 0°C to 70°C on the original. This provides broader environmental compatibility for industrial and automotive applications.

Q: Are both devices RoHS compliant?

A: Yes. Both the PIC16LC642-04/SP and PIC16LF72-I/SP are ROHS3 compliant and REACH unaffected, maintaining regulatory consistency across substitution.