AT89C55WD-24PC Equivalent & Substitute Parts

Part Overview

The AT89C55WD-24PC is an 8051-based 8-bit microcontroller manufactured by Microchip Technology, featuring 20KB of FLASH program memory and operating at 24MHz. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and system maintenance. Substitute parts must maintain core processor architecture, I/O count, voltage specifications, and package compatibility while accommodating variations in memory capacity, speed, and operating temperature ranges.

Substiute Parts

AT89C55WD-24PC

Microchip TechnologyIn Stock: 1423AT89C55WD-24PC Datasheet

Current PartRFQ

AT89C55WD-24PU

Microchip TechnologyIn Stock: 5611AT89C55WD-24PU Datasheet

DirectRFQ

DS89C430-MNG+

Analog Devices Inc./Maxim IntegratedIn Stock: 20134DS89C430-MNG+ Datasheet

MFR RecommendedRFQ

DS89C430-MNL+

Analog Devices Inc./Maxim IntegratedIn Stock: 1165DS89C430-MNL+ Datasheet

MFR RecommendedRFQ

DS89C450-MNL+

Analog Devices Inc./Maxim IntegratedIn Stock: 1779DS89C450-MNL+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT89C55WD-24PC is determined by the following mandatory parameters:

• Core Processor Architecture: Must be 8051-based
• Core Size: Must be 8-Bit
• Package / Case: Must be 40-DIP (0.600", 15.24mm)
• Mounting Type: Must be Through Hole
• Number of I/O: Must be 32
• Voltage - Supply (Vcc/Vdd): Must be 4.5V ~ 5.5V
• Program Memory Type: Must be FLASH

Variations permitted in substitute parts include program memory capacity (equal to or greater than 20KB), operating speed (equal to or greater than 24MHz), operating temperature range (may extend beyond 0°C ~ 70°C), and additional connectivity or peripheral features. RAM size may vary within the 8051 architecture constraints.

Parameter Comparison

Engineering Selection Recommendations

AT89C55WD-24PU is the direct equivalent substitute from Microchip Technology. It maintains identical core specifications (8051 processor, 8-Bit, 24MHz, 20KB FLASH, 32 I/O, 40-DIP package) while offering active product status and ROHS3 compliance. Operating temperature range extends to -40°C ~ 85°C, providing broader environmental coverage than the original part.

DS89C430-MNL+ (Analog Devices Inc./Maxim Integrated) is an active substitute with extended operating speed (33MHz) and expanded RAM (1K x 8). Program memory is reduced to 16KB, which may require design evaluation for applications requiring the full 20KB capacity. This part includes Power-Fail Reset peripheral and external oscillator support. ROHS3 compliant.

DS89C450-MNL+ (Analog Devices Inc./Maxim Integrated) is an active substitute with the highest program memory capacity (64KB FLASH) and operating speed (33MHz). Suitable for applications requiring expanded memory footprint. Includes Power-Fail Reset peripheral and external oscillator support. ROHS3 compliant.

DS89C430-MNG+ (Analog Devices Inc./Maxim Integrated) is an obsolete substitute with 25MHz speed and 16KB FLASH memory. Product status is obsolete, limiting suitability for new designs or long-term production continuity.

For new designs and production continuity, AT89C55WD-24PU is the preferred substitute. For applications requiring higher speed or expanded memory, DS89C430-MNL+ or DS89C450-MNL+ are suitable alternatives with active product status and full compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can AT89C55WD-24PU be used as a direct replacement for AT89C55WD-24PC?

A: Yes. AT89C55WD-24PU maintains identical core processor architecture (8051), core size (8-Bit), operating speed (24MHz), program memory capacity (20KB FLASH), I/O count (32), voltage supply range (4.5V ~ 5.5V), and 40-DIP package. The primary differences are active product status, ROHS3 compliance, and extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C).

Q: What is the difference between DS89C430-MNL+ and DS89C450-MNL+?

A: Both parts share identical core processor (8051), speed (33MHz), operating temperature (-40°C ~ 85°C), and 40-DIP package. The primary difference is program memory capacity: DS89C430-MNL+ provides 16KB FLASH, while DS89C450-MNL+ provides 64KB FLASH. Selection depends on application memory requirements.

Q: Are all substitute parts compatible with the 40-DIP package footprint?

A: Yes. All substitute parts listed use the 40-DIP (0.600", 15.24mm) package with Through Hole mounting, ensuring mechanical and electrical compatibility with existing PCB designs.

Q: What is the impact of oscillator type differences (Internal vs. External)?

A: The original AT89C55WD-24PC uses an internal oscillator, while DS89C430-MNG+, DS89C430-MNL+, and DS89C450-MNL+ require external oscillators. This requires circuit design modifications to accommodate external clock generation. AT89C55WD-24PU maintains internal oscillator compatibility.

Q: Are all substitute parts RoHS compliant?

A: AT89C55WD-24PC is RoHS non-compliant. All substitute parts (AT89C55WD-24PU, DS89C430-MNG+, DS89C430-MNL+, DS89C450-MNL+) are ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: Can I use DS89C430-MNG+ for new production designs?

A: DS89C430-MNG+ is classified as obsolete. For new designs and long-term production continuity, use AT89C55WD-24PU, DS89C430-MNL+, or DS89C450-MNL+, which all have active product status.

Q: What is the significance of the expanded RAM in DS89C430 and DS89C450 series?

A: DS89C430-MNL+ and DS89C450-MNL+ provide 1K x 8 RAM compared to 256 x 8 in the original part. This expanded RAM capacity supports applications requiring larger data storage or stack depth, though it does not affect core processor compatibility or package footprint.