PIC16LC554-04I/SO Equivalent & Substitute Parts

Part Overview

The PIC16LC554-04I/SO is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, designed for embedded applications requiring low-power operation and basic I/O control. This device features 896B of OTP (One-Time Programmable) memory, 13 I/O pins, and operates at 4MHz with a supply voltage range of 2.5V to 5.5V. The part is currently active in production and RoHS3 compliant.

Substitute parts are identified when design requirements allow for enhanced capabilities such as reprogrammable memory, higher clock speeds, expanded I/O count, or improved peripheral integration, while maintaining package compatibility and core functionality.

Substiute Parts

PIC16LC554-04I/SO

Microchip TechnologyIn Stock: 920PIC16LC554-04I/SO Datasheet

Current PartRFQ

PIC16F627A-I/SO

Microchip TechnologyIn Stock: 8751PIC16F627A-I/SO Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC16LC554-04I/SO is determined by the following critical parameters:

Package Compatibility: The 18-SOIC package is the primary mechanical constraint. Substitute parts must use the identical 18-SOIC (0.295", 7.50mm Width) package to ensure PCB footprint compatibility without redesign.

Core Architecture: All substitutes must maintain the PIC 8-bit core processor family to ensure instruction set compatibility and firmware portability.

Supply Voltage Range: The substitute must operate within or encompass the 2.5V to 5.5V supply range of the original part.

Operating Temperature Range: The substitute must support the -40°C to 85°C operating temperature specification.

Peripheral Compatibility: The original part includes POR (Power-On Reset) and WDT (Watchdog Timer). Substitutes may include additional peripherals without affecting compatibility.

The PIC16F627A-I/SO qualifies as a direct substitute based on these criteria. While it offers enhanced specifications (FLASH memory instead of OTP, higher clock speed, expanded I/O, and additional peripherals), it maintains full package compatibility and operates within the required voltage and temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

PIC16F627A-I/SO is the qualified substitute for PIC16LC554-04I/SO applications. Both devices are active products with ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements.

The PIC16F627A-I/SO provides functional enhancement through FLASH memory (reprogrammable versus one-time programmable), increased clock speed (20MHz versus 4MHz), expanded I/O capability (16 pins versus 13), and additional on-chip peripherals including UART/USART, Brown-out Detect/Reset, and PWM functionality. These enhancements are backward-compatible with the original part's instruction set and package footprint.

The minimum supply voltage for PIC16F627A-I/SO is 3V, compared to 2.5V for the original part. Applications requiring operation below 3V must retain the PIC16LC554-04I/SO.

Both devices maintain identical operating temperature specifications (-40°C to 85°C) and identical 18-SOIC package dimensions, eliminating the need for PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can PIC16F627A-I/SO be used as a direct replacement for PIC16LC554-04I/SO without PCB modification?

A: Yes. Both devices use the 18-SOIC package with identical pin spacing and dimensions (0.295", 7.50mm Width). No PCB layout changes are required.

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

A: The PIC16LC554-04I/SO uses OTP (One-Time Programmable) memory, while the PIC16F627A-I/SO uses FLASH memory, allowing multiple reprogramming cycles. The PIC16F627A-I/SO also operates at higher clock speed (20MHz versus 4MHz) and provides additional I/O pins and peripherals.

Q: Are there voltage compatibility concerns when substituting?

A: The PIC16F627A-I/SO requires a minimum supply voltage of 3V, whereas the PIC16LC554-04I/SO operates down to 2.5V. If your application requires operation below 3V, the original part must be retained.

Q: Is firmware compatibility maintained between these parts?

A: Both devices use the PIC 8-bit instruction set architecture. Firmware written for the PIC16LC554-04I/SO will execute on the PIC16F627A-I/SO without modification, though the substitute's enhanced features may be utilized for improved functionality.

Q: Do both parts meet current compliance standards?

A: Yes. Both the PIC16LC554-04I/SO and PIC16F627A-I/SO are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export purposes.

Q: What is the advantage of FLASH memory over OTP?

A: FLASH memory allows in-circuit reprogramming and field updates, whereas OTP memory is programmed once during manufacturing. FLASH memory is preferred for development, prototyping, and applications requiring firmware updates.