TS87C54X2-LIA Equivalent & Substitute Parts

Part Overview

The TS87C54X2-LIA is an 8-bit microcontroller from Microchip Technology based on the 80C51 core architecture. This device features 16KB of OTP (One-Time Programmable) memory, 256 bytes of RAM, and 32 I/O pins in a 40-PDIL package. The TS87C54X2-LIA is classified as obsolete, making equivalent substitute parts 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	256 x 8
Speed	30/20MHz
Number of I/O	32
Voltage Supply (Vcc/Vdd)	2.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	40-DIP (0.600", 15.24mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the TS87C54X2-LIA is based on the following critical parameters:

Core Architecture: 80C51/8051 compatibility ensures instruction set and functional equivalence
Program Memory: 16KB OTP capacity must be maintained
I/O Count: 32 I/O pins required for pin-compatible replacement
Package: 40-DIP form factor for mechanical and electrical compatibility
Voltage Supply Range: Operating voltage window must accommodate the original 2.7V ~ 5.5V specification
Operating Temperature: Extended temperature range (-40°C ~ 85°C) preferred for industrial applications

The DS87C520-MCL+ and DS87C520-MNL+ are functionally equivalent substitutes. Both devices maintain the 80C51 core architecture, 16KB OTP program memory, 32 I/O pins, and 40-DIP package. These parts are active products with improved specifications including higher clock speed (33MHz), larger RAM (1K x 8), and enhanced peripheral integration.

Parameter Comparison

Parameter	TS87C54X2-LIA	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	30/20MHz	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	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	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both DS87C520-MCL+ and DS87C520-MNL+ are active, production-supported alternatives to the obsolete TS87C54X2-LIA. Selection between these two substitutes depends on operating temperature requirements:

DS87C520-MNL+: Recommended for applications requiring extended temperature operation (-40°C ~ 85°C). This part matches the original temperature specification and is suitable for industrial and automotive environments.
DS87C520-MCL+: Suitable for commercial-grade applications with standard temperature range (0°C ~ 70°C). This part offers the same core functionality with reduced temperature specification.

Both substitutes provide ROHS3 compliance, addressing environmental and regulatory requirements not met by the original part. The DS87C520 series offers performance improvements including higher clock speed (33MHz vs. 30/20MHz) and increased RAM capacity (1K x 8 vs. 256 x 8), enabling more efficient code execution and data handling.

Note: The voltage supply range of the DS87C520 series (4.5V ~ 5.5V) is narrower than the original part (2.7V ~ 5.5V). Applications requiring operation below 4.5V require design review.

Frequently Asked Questions (FAQ)

Q: Are the DS87C520-MCL+ and DS87C520-MNL+ pin-compatible with the TS87C54X2-LIA?

A: Yes. Both substitute parts use the same 40-DIP package with identical pin assignments, enabling direct socket replacement without PCB modifications.

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

A: The operating temperature range differs. DS87C520-MNL+ supports -40°C ~ 85°C (extended range), while DS87C520-MCL+ supports 0°C ~ 70°C (commercial range). Both parts are electrically and functionally identical.

Q: Can the DS87C520 series operate at voltages below 4.5V?

A: No. The DS87C520 series minimum supply voltage is 4.5V, whereas the original TS87C54X2-LIA operates from 2.7V. Applications requiring sub-4.5V operation must retain the original part or redesign the power supply.

Q: Are the DS87C520 substitutes RoHS compliant?

A: Yes. Both DS87C520-MCL+ and DS87C520-MNL+ are ROHS3 compliant, meeting current environmental regulations. The original TS87C54X2-LIA is RoHS non-compliant.

Q: What are the memory advantages of the DS87C520 series?

A: The DS87C520 series provides 1K x 8 RAM compared to 256 x 8 in the original part, offering four times the data storage capacity. Program memory remains 16KB OTP in both cases.

Q: Is the higher clock speed (33MHz) of the DS87C520 backward compatible?

A: Yes. The DS87C520 operates at 33MHz maximum, which is faster than the original 30/20MHz specification. Existing firmware will execute correctly at the higher speed without modification, though timing-dependent code may require validation.

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