TS87C51RB2-MIA Equivalent & Substitute Parts

Part Overview

The TS87C51RB2-MIA is an 8-bit microcontroller from Microchip Technology based on the 80C51 core architecture. This device features 16KB of OTP (One-Time Programmable) memory, 512 bytes of RAM, and operates at 40/20MHz with a 40-pin DIP package. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value
Core Processor	80C51
Core Size	8-Bit
Program Memory Size	16KB (16K x 8)
Program Memory Type	OTP
RAM Size	512 x 8
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V
Number of I/O	32
Package / Case	40-DIP (0.600", 15.24mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the TS87C51RB2-MIA is based on the following critical parameters:

Core Architecture: Both substitute parts use the 8051 core, maintaining instruction set compatibility with the 80C51 base
Memory Configuration: 16KB OTP program memory and 1K x 8 RAM meet or exceed the original specification
Electrical Compatibility: 4.5V ~ 5.5V supply voltage range matches the original part
Package Compatibility: 40-DIP package with identical pin count (32 I/O) and physical dimensions (0.600", 15.24mm)
Peripheral Set: UART/USART connectivity and watchdog timer (WDT) functionality preserved across all parts

The DS87C520-MCL+ and DS87C520-MNL+ variants are functionally equivalent substitutes, differing only in operating temperature range and packaging format (both supplied in tubes).

Parameter Comparison

Parameter	TS87C51RB2-MIA	DS87C520-MCL+	DS87C520-MNL+
Manufacturer	Microchip Technology	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Core Processor	80C51	8051	8051
Core Size	8-Bit	8-Bit	8-Bit
Speed	40/20MHz	33MHz	33MHz
Program Memory Size	16KB (16K x 8)	16KB (16K x 8)	16KB (16K x 8)
Program Memory Type	OTP	OTP	OTP
RAM Size	512 x 8	1K x 8	1K x 8
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Number of I/O	32	32	32
Operating Temperature	-40°C ~ 85°C (TA)	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)
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	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both DS87C520-MCL+ and DS87C520-MNL+ are active production parts from Analog Devices Inc./Maxim Integrated, providing long-term availability compared to the obsolete TS87C51RB2-MIA. The substitute parts achieve ROHS3 compliance, addressing regulatory requirements for new designs.

DS87C520-MNL+ is the preferred selection for applications requiring extended temperature operation (-40°C ~ 85°C), matching the original part's thermal range. This variant maintains full compatibility with legacy designs operating across industrial temperature specifications.

DS87C520-MCL+ is suitable for commercial-grade applications with standard operating temperature range (0°C ~ 70°C). This variant offers equivalent functionality with reduced thermal stress on the component.

Both substitutes provide increased RAM capacity (1K x 8 versus 512 x 8), enhanced peripheral integration (Power-Fail Reset, EBI/EMI support), and higher clock speed (33MHz versus 40/20MHz), delivering improved performance margins for existing designs.

Frequently Asked Questions (FAQ)

Q: Are the DS87C520 variants pin-compatible with the TS87C51RB2-MIA?

A: Yes. Both substitute parts use the 40-DIP package with identical physical dimensions (0.600", 15.24mm) and pin count (32 I/O). Direct socket replacement is possible without PCB modification.

Q: What is the difference between DS87C520-MCL+ and DS87C520-MNL+?

A: The primary difference is operating temperature range. DS87C520-MCL+ operates from 0°C to 70°C, while DS87C520-MNL+ operates from -40°C to 85°C. Select DS87C520-MNL+ for applications requiring extended temperature operation matching the original TS87C51RB2-MIA specification.

Q: Will existing firmware run on the substitute parts without modification?

A: The 8051 core architecture ensures instruction set compatibility. Firmware compiled for the TS87C51RB2-MIA will execute on both DS87C520 variants without code changes. Verify peripheral initialization sequences if custom drivers access device-specific registers.

Q: How does the increased RAM capacity affect compatibility?

A: The substitute parts provide 1K x 8 RAM compared to 512 x 8 in the original part. This additional memory is backward-compatible; existing code using 512 bytes will function without modification, with extra memory available for expanded applications.

Q: What is the significance of ROHS3 compliance on the substitute parts?

A: ROHS3 compliance indicates the substitute parts meet current environmental and regulatory standards for electronic components. The original TS87C51RB2-MIA is RoHS non-compliant, making the substitutes necessary for designs subject to RoHS requirements.

Q: Can both substitute parts be used interchangeably in production?

A: Yes, both DS87C520-MCL+ and DS87C520-MNL+ are functionally equivalent and pin-compatible. Selection should be based on the application's operating temperature requirements. Designs operating within 0°C to 70°C may use either variant; designs requiring -40°C to 85°C operation must use DS87C520-MNL+.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message