AT25M02-SSHM-T Equivalent & Substitute Parts

Part Overview

The AT25M02-SSHM-T is a 2Mbit Serial Peripheral Interface (SPI) EEPROM memory integrated circuit manufactured by Microchip Technology. This non-volatile memory device operates at 5 MHz clock frequency with a 256K x 8 memory organization, housed in an 8-SOIC surface mount package. The device is currently in active production status and maintains full RoHS3 compliance. Substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits selection from qualified alternatives meeting identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	SPI
Clock Frequency	5 MHz
Write Cycle Time	10ms
Voltage Supply Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT25M02-SSHM-T is determined by strict equivalence across the following critical parameters: 2Mbit memory capacity, 256K x 8 organization, SPI interface protocol, 8-SOIC package geometry, surface mount mounting type, and operating temperature range of -40°C to 85°C. The substitute parts listed maintain these core specifications, ensuring functional and mechanical compatibility within the same application context. Variations in clock frequency, write cycle time, voltage supply range, and product status are documented but do not disqualify substitution when the primary part is unavailable.

Parameter Comparison

Parameter	AT25M02-SSHM-T (Microchip)	M95M02-DRMN6TP (STMicroelectronics)	CAT25M02VI-GT3 (onsemi)
Memory Size	2Mbit	2Mbit	2Mbit
Memory Organization	256K x 8	256K x 8	256K x 8
Memory Interface	SPI	SPI	SPI
Clock Frequency	5 MHz	5 MHz	10 MHz
Write Cycle Time	10ms	10ms	6ms
Voltage Supply Range	1.7V ~ 5.5V	1.8V ~ 5.5V	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Obsolete

Engineering Selection Recommendations

The M95M02-DRMN6TP from STMicroelectronics is the primary substitute for the AT25M02-SSHM-T. Both devices maintain identical memory specifications, clock frequency, write cycle time, and operating temperature range. The M95M02-DRMN6TP is verified as DiGi-Electronics programmable and carries a lower moisture sensitivity level (MSL 1 versus MSL 3), indicating superior moisture resistance. Both parts are in active production status with full RoHS3 compliance.

The CAT25M02VI-GT3 from onsemi is a qualified substitute with enhanced performance characteristics: 10 MHz clock frequency and 6ms write cycle time provide operational headroom beyond the primary part specifications. However, this part is classified as obsolete and carries a minimum voltage supply threshold of 1.7V (matching the primary part) with a lower moisture sensitivity level. The onsemi device is suitable for applications where enhanced speed performance is beneficial and supply availability is confirmed.

Frequently Asked Questions (FAQ)

Q: Can the M95M02-DRMN6TP be used as a direct replacement for the AT25M02-SSHM-T?

A: Yes. Both devices share identical memory capacity (2Mbit), organization (256K x 8), SPI interface, clock frequency (5 MHz), write cycle time (10ms), operating temperature range (-40°C to 85°C), and 8-SOIC package geometry. The minimum supply voltage for the M95M02-DRMN6TP is 1.8V compared to 1.7V for the AT25M02-SSHM-T; verify your application's minimum supply voltage requirement.

Q: What are the differences between the CAT25M02VI-GT3 and the primary part?

A: The CAT25M02VI-GT3 operates at 10 MHz clock frequency with a 6ms write cycle time, compared to 5 MHz and 10ms for the AT25M02-SSHM-T. Both maintain the same memory capacity, organization, and package. The CAT25M02VI-GT3 is classified as obsolete; confirm availability before design selection.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 8-SOIC package with identical 0.154" width and 3.90mm dimensions, ensuring mechanical and electrical pin compatibility on the same PCB footprint.

Q: What is the significance of the moisture sensitivity level (MSL) difference?

A: The AT25M02-SSHM-T carries MSL 3 (168 hours), while both substitute parts carry MSL 1 (unlimited). MSL rating indicates the maximum time a component can be exposed to moisture before soldering. Lower MSL values provide greater tolerance for storage and handling conditions.

Q: Can the CAT25M02VI-GT3 be used if the primary part is unavailable?

A: The CAT25M02VI-GT3 meets all core electrical and mechanical specifications for substitution. However, verify that your application can tolerate the obsolete product status and confirm current inventory availability before committing to this alternative.

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