PIC16C554T-04I/SO Equivalent & Substitute Parts

Part Overview

The PIC16C554T-04I/SO is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, designed for embedded applications requiring OTP (One-Time Programmable) memory. This device operates at 4MHz with 896B program memory and is housed in an 18-SOIC surface mount package. The product maintains Active status and is RoHS3 compliant. Substitute parts are identified when equivalent functional requirements can be met through alternative microcontroller architectures within compatible packaging and electrical specifications.

Substiute Parts

PIC16C554T-04I/SO

Microchip TechnologyIn Stock: 909PIC16C554T-04I/SO Datasheet

Current PartRFQ

PIC16F627A-I/SO

Microchip TechnologyIn Stock: 8751PIC16F627A-I/SO Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The PIC16F627A-I/SO qualifies as a substitute for the PIC16C554T-04I/SO based on the following substitution criteria:

Compatible Parameters:

• Core Processor: Both utilize PIC architecture
• Core Size: Both are 8-Bit microcontrollers
• Voltage Supply Range: Both operate within 3V ~ 5.5V
• Operating Temperature Range: Both support -40°C ~ 85°C (TA)
• Package / Case: Both use 18-SOIC (0.295", 7.50mm Width) surface mount packaging
• Mounting Type: Both are surface mount devices
• RoHS Status: Both are ROHS3 compliant
• Moisture Sensitivity Level: Both rated MSL 1 (Unlimited)

Substitution Logic: The PIC16F627A-I/SO provides enhanced capabilities within the same physical footprint and electrical envelope. While the original part uses OTP memory, the substitute employs FLASH memory technology, offering reprogrammability. The substitute provides increased program memory (1.75KB vs. 896B), expanded RAM (224 x 8 vs. 80 x 8), additional I/O pins (16 vs. 13), and enhanced peripheral support including UART/USART connectivity and PWM functionality. These improvements maintain backward compatibility with the supply voltage and thermal operating range while offering superior performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

Selection between the PIC16C554T-04I/SO and PIC16F627A-I/SO depends on application-specific requirements within the constraints of the provided specifications.

The PIC16C554T-04I/SO remains the appropriate choice for applications where OTP memory is a design requirement and the 4MHz operating speed and 896B program memory are sufficient. Both devices maintain Active product status and full RoHS3 compliance.

The PIC16F627A-I/SO is suitable for applications requiring FLASH memory reprogrammability, higher processing speed (20MHz), expanded memory resources (1.75KB program memory, 224 x 8 RAM, 128 x 8 EEPROM), additional I/O capability (16 pins vs. 13), and enhanced peripheral integration (UART/USART, PWM, Brown-out Detect/Reset). Both devices operate within identical voltage supply ranges (3V ~ 5.5V) and thermal specifications (-40°C ~ 85°C), ensuring thermal and electrical compatibility in equivalent circuit environments.

Frequently Asked Questions (FAQ)

Q: Can the PIC16F627A-I/SO directly replace the PIC16C554T-04I/SO in existing designs?

A: Physical and electrical compatibility is confirmed through identical 18-SOIC packaging, matching supply voltage range (3V ~ 5.5V), and equivalent operating temperature specifications (-40°C ~ 85°C). Pin-to-pin compatibility and functional equivalence require design-level verification based on specific application requirements and memory architecture differences (OTP vs. FLASH).

Q: What are the key differences in memory architecture between these devices?

A: The PIC16C554T-04I/SO uses OTP (One-Time Programmable) memory with 896B capacity. The PIC16F627A-I/SO uses FLASH memory with 1.75KB program capacity, 128 x 8 EEPROM, and 224 x 8 RAM. FLASH memory allows multiple reprogramming cycles, while OTP memory permits single programming only.

Q: Are there differences in peripheral support?

A: The PIC16C554T-04I/SO includes POR and WDT peripherals. The PIC16F627A-I/SO includes Brown-out Detect/Reset, POR, PWM, and WDT. The substitute provides additional peripheral functionality within the same package footprint.

Q: Do both devices meet the same compliance standards?

A: Both devices are ROHS3 compliant and rated MSL 1 (Unlimited). Both maintain Active product status from Microchip Technology.

Q: What is the impact of the speed difference (4MHz vs. 20MHz)?

A: The PIC16F627A-I/SO operates at 20MHz compared to the 4MHz specification of the PIC16C554T-04I/SO. This higher speed capability does not create incompatibility; applications can operate the substitute at reduced clock frequencies if required by design specifications.

Q: Are there I/O pin count differences?

A: The PIC16C554T-04I/SO provides 13 I/O pins. The PIC16F627A-I/SO provides 16 I/O pins. Both devices use the same 18-SOIC package, with the additional I/O pins available for application use.