AT87C52X2-3CSUL Equivalent & Substitute Parts

Part Overview

The AT87C52X2-3CSUL is an 8-bit microcontroller from Microchip Technology based on the 80C51 core architecture. It features 8KB of OTP (One-Time Programmable) memory, operates at 30/20MHz, and is housed in a 40-pin DIP package. The device is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations where this architecture remains applicable.

Key Parameters

Parameter	Value
Manufacturer Part Number	AT87C52X2-3CSUL
Manufacturer	Microchip Technology
Core Processor	80C51
Core Size	8-Bit
Program Memory Size	8KB (8K x 8)
Program Memory Type	OTP
Speed	30/20MHz
Number of I/O	32
RAM Size	256 x 8
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 for the AT87C52X2-3CSUL is based on the following critical parameters:

Core Architecture Compatibility: Both substitute parts (DS87C520-MCL+ and DS87C520-MNL+) utilize the 8051 core processor, maintaining instruction set compatibility with the original 80C51 architecture.

Package Compatibility: All parts use the 40-DIP (0.600", 15.24mm) through-hole package, ensuring mechanical and electrical pin compatibility on existing PCBs.

Memory Configuration: The substitute parts provide 16KB OTP program memory, which exceeds the original 8KB specification. This larger memory capacity is backward compatible for applications requiring the original 8KB footprint.

I/O Count: All parts maintain 32 I/O pins, preserving signal routing and interface requirements.

Voltage Supply Range: The substitute parts operate within 4.5V ~ 5.5V, which is a subset of the original 2.7V ~ 5.5V range. Applications operating at the lower voltage boundary (2.7V ~ 4.5V) require verification.

Operating Temperature: DS87C520-MNL+ matches the original -40°C ~ 85°C range, while DS87C520-MCL+ operates within 0°C ~ 70°C, requiring temperature range assessment for specific applications.

Compliance: All parts maintain ROHS3 compliance and identical ECCN/HTSUS classifications.

Parameter Comparison

Parameter	AT87C52X2-3CSUL	DS87C520-MCL+	DS87C520-MNL+
Core Processor	80C51	8051	8051
Core Size	8-Bit	8-Bit	8-Bit
Speed	30/20MHz	33MHz	33MHz
Program Memory Size	8KB (8K x 8)	16KB (16K x 8)	16KB (16K x 8)
Program Memory Type	OTP	OTP	OTP
RAM Size	256 x 8	1K x 8	1K x 8
Number of I/O	32	32	32
Voltage Supply (Vcc/Vdd)	2.7V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	40-DIP (0.600", 15.24mm)	40-DIP (0.600", 15.24mm)	40-DIP (0.600", 15.24mm)
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

DS87C520-MNL+ (Preferred): This part is the optimal substitute for the AT87C52X2-3CSUL. It maintains full compatibility across all critical parameters, including the -40°C ~ 85°C operating temperature range and 4.5V ~ 5.5V supply voltage. The part is in active production status with unlimited moisture sensitivity rating, providing superior long-term availability and handling characteristics. ROHS3 compliance and identical trade classification ensure regulatory and supply chain continuity.

DS87C520-MCL+ (Conditional): This part is suitable for applications operating within the 0°C ~ 70°C temperature range. It shares all other compatibility parameters with the original part and offers active product status. Selection of this variant requires confirmation that the application does not require operation below 0°C or above 70°C.

Voltage Supply Consideration: Both substitute parts operate within 4.5V ~ 5.5V. Applications requiring operation below 4.5V must be evaluated for compatibility, as the original part supports 2.7V ~ 5.5V operation.

Frequently Asked Questions (FAQ)

Q: Are the DS87C520 parts pin-compatible with the AT87C52X2-3CSUL?

A: Yes. Both substitute parts use the 40-DIP (0.600", 15.24mm) package with identical pin assignments and 32 I/O pins, ensuring direct PCB compatibility without layout modifications.

Q: Can I use DS87C520-MCL+ in place of DS87C520-MNL+?

A: DS87C520-MCL+ is suitable only for applications operating within 0°C ~ 70°C. If your system requires operation at -40°C or above 70°C, DS87C520-MNL+ is required.

Q: What is the impact of increased program memory (16KB vs. 8KB)?

A: The 16KB program memory in substitute parts is backward compatible. Existing firmware compiled for 8KB will execute without modification. The additional 8KB capacity enables expanded functionality if required.

Q: Does the increased RAM size (1K x 8 vs. 256 x 8) affect compatibility?

A: No. The larger RAM in substitute parts is fully backward compatible. Existing code utilizing 256 bytes of RAM will function identically on parts with 1K RAM.

Q: What is the significance of the MSL rating difference?

A: The original part has MSL 3 (168 hours), while substitute parts have MSL 1 (unlimited). MSL 1 indicates superior moisture resistance and longer shelf life without baking requirements, providing handling and storage advantages.

Q: Are there voltage supply limitations I should consider?

A: Yes. The substitute parts operate within 4.5V ~ 5.5V, which is narrower than the original 2.7V ~ 5.5V range. Confirm your system supply voltage is within 4.5V ~ 5.5V before substitution.

Q: What is the speed difference between 30/20MHz and 33MHz?

A: The substitute parts operate at 33MHz, which is faster than the original 30MHz maximum. This higher speed is backward compatible and does not require firmware modification. Timing-critical applications should verify that faster execution does not introduce timing violations.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message