AT80C32X2-3CSUL Equivalent & Substitute Parts

Part Overview

The AT80C32X2-3CSUL is an 8-bit microcontroller from Microchip Technology's 80C series, featuring a ROMless architecture with 256 x 8 bytes of RAM and operating speeds of 30/20MHz. This device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The ROMless configuration requires external program memory, distinguishing it from masked ROM variants within the 80C51 family.

Key Parameters

Parameter	AT80C32X2-3CSUL
Manufacturer	Microchip Technology
Core Processor	80C51
Core Size	8-Bit
Speed	30/20MHz
Program Memory Type	ROMless
RAM Size	256 x 8
Number of I/O	32
Voltage Supply (Vcc/Vdd)	2.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	40-DIP (0.600", 15.24mm)
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT80C32X2-3CSUL is determined by the following critical parameters:

Core Processor Architecture: Must be 80C51-based to ensure instruction set compatibility
Program Memory Type: Must be ROMless to maintain external program memory interface requirements
Package / Case: Must be 40-DIP (0.600", 15.24mm) for mechanical and electrical pin compatibility
Voltage Supply Range: Must support 2.7V ~ 5.5V operation
Operating Temperature Range: Must support -40°C ~ 85°C
Mounting Type: Must be Through Hole for PCB integration compatibility
Number of I/O: Must provide 32 I/O pins minimum

The AT80C51RD2-3CSUM meets all substitution criteria. While it offers enhanced specifications (40MHz speed, 1K x 8 RAM, additional peripherals including PWM and WDT), these improvements are backward-compatible with designs targeting the AT80C32X2-3CSUL, as the core instruction set and pin configuration remain identical.

Parameter Comparison

Parameter	AT80C32X2-3CSUL	AT80C51RD2-3CSUM	Compatibility Notes
Manufacturer	Microchip Technology	Microchip Technology	Same manufacturer
Core Processor	80C51	80C51	Identical architecture
Core Size	8-Bit	8-Bit	Identical
Speed	30/20MHz	40MHz	Substitute operates at higher speed
Program Memory Type	ROMless	ROMless	Identical configuration
RAM Size	256 x 8	1K x 8	Substitute provides 4x RAM capacity
Number of I/O	32	32	Identical
Voltage Supply (Vcc/Vdd)	2.7V ~ 5.5V	2.7V ~ 5.5V	Identical range
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	Identical range
Package / Case	40-DIP (0.600", 15.24mm)	40-DIP (0.600", 15.24mm)	Pin-compatible
Mounting Type	Through Hole	Through Hole	Identical
Product Status	Obsolete	Active	Substitute is actively manufactured
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Both compliant

Engineering Selection Recommendations

The AT80C51RD2-3CSUM is the qualified substitute for the obsolete AT80C32X2-3CSUL based on the following engineering criteria:

Product Status Alignment: The AT80C32X2-3CSUL is obsolete, while the AT80C51RD2-3CSUM maintains active production status, ensuring long-term availability and supply chain continuity.

Regulatory Compliance: Both devices maintain ROHS3 compliance and identical REACH status (REACH Unaffected), satisfying environmental and regulatory requirements without modification.

Pin and Package Compatibility: Both devices utilize the 40-DIP (0.600", 15.24mm) package with identical Through Hole mounting, enabling direct PCB substitution without layout redesign.

Electrical Specifications: Identical voltage supply range (2.7V ~ 5.5V) and operating temperature range (-40°C ~ 85°C) ensure functional equivalence in existing circuit designs.

Instruction Set Compatibility: Both devices employ the 80C51 core processor architecture, guaranteeing software and firmware compatibility without code modification.

Enhanced Capabilities: The AT80C51RD2-3CSUM provides superior specifications (40MHz vs. 30/20MHz, 1K x 8 RAM vs. 256 x 8, additional peripherals) that are backward-compatible with designs targeting the original part.

Frequently Asked Questions (FAQ)

Q: Can the AT80C51RD2-3CSUM be used as a direct replacement for the AT80C32X2-3CSUL?

A: Yes. Both devices share identical 80C51 core architecture, 40-DIP package configuration, pin assignments, voltage supply range, and operating temperature specifications. The substitute is pin-compatible and software-compatible with no circuit modifications required.

Q: What are the key differences between these two parts?

A: The AT80C51RD2-3CSUM operates at 40MHz (compared to 30/20MHz), provides 1K x 8 bytes of RAM (compared to 256 x 8), and includes additional peripherals (PWM and WDT). These enhancements are backward-compatible with existing designs.

Q: Does the higher speed of the AT80C51RD2-3CSUM affect circuit design?

A: No. The substitute operates at a higher speed while maintaining full compatibility with the original part's electrical specifications and timing requirements. Existing circuit designs require no modification.

Q: Are both devices ROMless?

A: Yes. Both the AT80C32X2-3CSUL and AT80C51RD2-3CSUM are ROMless variants, requiring external program memory. This characteristic is preserved in the substitution.

Q: What is the package compatibility status?

A: Both devices use the 40-DIP (0.600", 15.24mm) Through Hole package. They are mechanically and electrically pin-compatible, allowing direct socket substitution on existing PCBs.

Q: Are there any compliance or certification differences?

A: No. Both devices maintain ROHS3 compliance and identical REACH status. Regulatory requirements are satisfied by either part without additional certification or documentation.

Q: Why is the AT80C32X2-3CSUL classified as obsolete?

A: The AT80C32X2-3CSUL has reached end-of-life status within Microchip Technology's product portfolio. The AT80C51RD2-3CSUM represents the active, supported alternative within the 80C51 family.

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