PIC16C554-04I/P Equivalent & Substitute Parts

Part Overview

The PIC16C554-04I/P is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 896B of OTP (One-Time Programmable) memory and operating at 4MHz. This device is designed for embedded applications requiring basic microcontroller functionality with external oscillator support and standard peripherals including Power-On Reset (POR) and Watchdog Timer (WDT).

The PIC16C554-04I/P maintains Active product status. Substitute parts are identified when equivalent electrical and mechanical parameters align with application requirements, particularly when OTP memory limitations or speed constraints necessitate alternative solutions.

Substiute Parts

PIC16C554-04I/P

Microchip TechnologyIn Stock: 839PIC16C554-04I/P Datasheet

Current PartRFQ

PIC16F627A-I/P

Microchip TechnologyIn Stock: 4694PIC16F627A-I/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC16C554-04I/P is determined by the following critical parameters:

Core Compatibility: Both main and substitute parts must be PIC 8-bit microcontrollers with identical core processor architecture (PIC).

Package Compatibility: The 18-DIP (0.300", 7.62mm) through-hole package must be maintained for mechanical and electrical pin compatibility.

Voltage Supply Range: Operating voltage range of 3V ~ 5.5V must be supported to ensure compatibility with existing power supply designs.

Operating Temperature Range: The -40°C ~ 85°C specification must be met or exceeded.

Peripheral Support: Minimum peripheral requirements include POR and WDT functionality.

The PIC16F627A-I/P qualifies as a substitute based on these parameters. While it offers enhanced specifications (FLASH memory instead of OTP, higher speed, additional I/O, and expanded peripherals), it maintains full compatibility with the core electrical and mechanical requirements of the PIC16C554-04I/P.

Parameter Comparison

Engineering Selection Recommendations

PIC16C554-04I/P Selection: Choose this part when OTP memory is required for production-level deployment and 4MHz operation meets application timing requirements. This device is suitable for cost-optimized, high-volume applications where code modification post-manufacturing is not necessary.

PIC16F627A-I/P Selection: This substitute provides FLASH memory technology, enabling in-system reprogramming and field updates. The higher clock speed (20MHz), expanded memory (1.75KB program, 224 x 8 RAM, 128 x 8 EEPROM), additional I/O pins (16 vs. 13), and enhanced peripherals (Brown-out Detect/Reset, PWM) make it suitable for applications requiring flexibility, faster execution, or extended functionality.

Both parts maintain identical voltage supply ranges, operating temperature specifications, RoHS3 compliance, and REACH unaffected status, ensuring regulatory and environmental compatibility. The 18-DIP package is consistent across both devices, supporting direct mechanical substitution in existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can the PIC16F627A-I/P directly replace the PIC16C554-04I/P in existing designs?

A: Yes, from a mechanical and electrical standpoint. Both devices use the 18-DIP package with identical pin spacing (0.300", 7.62mm) and support the same 3V ~ 5.5V supply voltage range. Pin-to-pin compatibility is maintained. However, firmware may require adjustment to account for the PIC16F627A-I/P's higher speed (20MHz vs. 4MHz) and additional peripherals.

Q: What is the primary difference between OTP and FLASH memory?

A: OTP (One-Time Programmable) memory in the PIC16C554-04I/P is programmed once during manufacturing and cannot be modified. FLASH memory in the PIC16F627A-I/P can be erased and reprogrammed multiple times, enabling field updates and development flexibility.

Q: Does the PIC16F627A-I/P require different oscillator configuration?

A: The PIC16C554-04I/P requires an external oscillator. The PIC16F627A-I/P supports both internal and external oscillator options, providing design flexibility. Existing external oscillator circuits remain compatible.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Moisture sensitivity level (MSL 1 - Unlimited) is identical, indicating equivalent handling and storage requirements.

Q: What additional I/O capability does the PIC16F627A-I/P provide?

A: The PIC16F627A-I/P offers 16 I/O pins compared to 13 on the PIC16C554-04I/P, providing three additional general-purpose I/O lines for expanded application functionality.