Equivalent & Substitute Parts for 93LC56AT/ST

Part Overview

The 93LC56AT/ST is a 2Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, featuring Microwire serial interface protocol and 8-TSSOP surface mount packaging. This device is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing production and maintenance applications. The 93LC56AT/ST operates across a supply voltage range of 2.5V to 5.5V with a standard industrial operating temperature range of 0°C to 70°C. Equivalent parts maintain identical memory capacity, interface protocol, and physical packaging while offering extended temperature ranges or improved voltage specifications.

Key Parameters

Parameter	Specification
Memory Size	2Kbit
Memory Organization	256 x 8
Memory Interface	Microwire
Clock Frequency	2 MHz
Write Cycle Time	6ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 93LC56AT/ST is determined by strict equivalence across the following critical parameters: memory capacity (2Kbit), memory organization (256 x 8 bits), serial interface protocol (Microwire), clock frequency (2 MHz), write cycle time (6ms), physical package (8-TSSOP), and mounting technology (surface mount). All substitute parts maintain these core specifications without deviation.

Substitute parts are grouped into two categories based on operational envelope:

Category 1: Direct Functional Equivalents maintain the original supply voltage range (2.5V ~ 5.5V) and standard industrial temperature range (0°C ~ 70°C). These parts are pin-compatible and electrically interchangeable without circuit modification.

Category 2: Extended-Range Equivalents provide expanded operating specifications including wider supply voltage ranges (1.8V ~ 5.5V) or extended temperature ratings (-40°C ~ 85°C or -40°C ~ 125°C). These parts are functionally superior and backward-compatible with the original design envelope.

All substitute parts are ROHS3 compliant, REACH unaffected, and maintain identical moisture sensitivity levels (MSL 1 - Unlimited).

Parameter Comparison

Parameter	93LC56AT/ST (Main)	93LC56A/ST	93AA56AT-I/ST	93LC56AT-E/ST	93LC56AT-I/ST
Memory Size	2Kbit	2Kbit	2Kbit	2Kbit	2Kbit
Memory Organization	256 x 8	256 x 8	256 x 8	256 x 8	256 x 8
Memory Interface	Microwire	Microwire	Microwire	Microwire	Microwire
Clock Frequency	2 MHz	2 MHz	2 MHz	2 MHz	2 MHz
Write Cycle Time	6ms	6ms	6ms	6ms	6ms
Voltage Supply Range	2.5V ~ 5.5V	2.5V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C
Package Type	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

93LC56A/ST is a direct functional equivalent with active product status. This part maintains identical electrical specifications and packaging to the obsolete 93LC56AT/ST. Selection of this part is appropriate for applications requiring standard industrial temperature operation (0°C ~ 70°C) and standard supply voltage range (2.5V ~ 5.5V). Packaging format differs (Tube versus Tape & Reel), which may affect procurement and assembly processes.

93LC56AT-I/ST is the primary recommended substitute for the 93LC56AT/ST. This part maintains the original supply voltage specification (2.5V ~ 5.5V) while extending the operating temperature range to -40°C ~ 85°C. Active product status and verified programmability certification ensure long-term availability and manufacturing consistency. Tape & Reel packaging matches the original part format. This part is suitable for applications requiring extended low-temperature operation beyond the original 0°C minimum.

93LC56AT-E/ST provides the widest operating temperature envelope (-40°C ~ 125°C) while maintaining the original supply voltage range (2.5V ~ 5.5V). This part is appropriate for applications requiring extended high-temperature operation to 125°C. Verified programmability certification and active product status support production continuity. Tape & Reel packaging matches the original format.

93AA56AT-I/ST is a manufacturer-recommended substitute offering the lowest supply voltage specification (1.8V ~ 5.5V) and extended temperature range (-40°C ~ 85°C). This part is based on the 93AA56 base product number and differs from the 93LC56 series. Selection of this part is appropriate for low-voltage applications and extended temperature environments. Note that programmability verification status is not confirmed for this part.

Frequently Asked Questions (FAQ)

Q: Can the 93LC56A/ST directly replace the obsolete 93LC56AT/ST in existing designs?

A: Yes. The 93LC56A/ST maintains identical electrical specifications, memory capacity, interface protocol, and physical packaging. The primary difference is packaging format (Tube versus Tape & Reel) and active product status. Pin-to-pin compatibility is complete.

Q: What is the primary difference between 93LC56AT-I/ST and 93LC56AT/ST?

A: The 93LC56AT-I/ST extends the operating temperature range from 0°C ~ 70°C to -40°C ~ 85°C while maintaining all other specifications. Supply voltage range remains 2.5V ~ 5.5V. This part is suitable for applications requiring operation below 0°C.

Q: Why does 93LC56AT-E/ST have a different temperature range than 93LC56AT-I/ST?

A: The 93LC56AT-E/ST is specified for extended high-temperature operation to 125°C, compared to 93LC56AT-I/ST which extends to 85°C. Both parts maintain the original supply voltage range. Selection depends on the maximum operating temperature requirement of the application.

Q: Is the 93AA56AT-I/ST compatible with the 93LC56AT/ST?

A: The 93AA56AT-I/ST is functionally compatible and pin-compatible with the 93LC56AT/ST. However, it is based on a different base product number (93AA56 versus 93LC56). This part offers lower minimum supply voltage (1.8V versus 2.5V) and extended temperature range (-40°C ~ 85°C). Programmability verification status differs from the original part.

Q: What does "Tape & Reel" packaging mean compared to "Tube" packaging?

A: Tape & Reel packaging is a continuous reel format suitable for automated assembly processes. Tube packaging is a discrete container format. Both contain identical components; the difference affects procurement, storage, and assembly line compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the environmental compliance profile of the original 93LC56AT/ST.

Q: Which substitute part should be selected for a new design?

A: For new designs, 93LC56AT-I/ST is the recommended primary choice due to active product status, extended temperature range (-40°C ~ 85°C), verified programmability, and Tape & Reel packaging format. This part provides superior operational envelope compared to the obsolete original while maintaining backward compatibility.

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