25LC020AT-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 25LC020AT-E/ST is a 2Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology in 8-TSSOP surface mount packaging. This non-volatile memory device operates at 10 MHz clock frequency with a supply voltage range of 2.5V to 5.5V and supports industrial temperature range operation from -40°C to 125°C. The part is ROHS3 compliant and currently in active production status. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, package form factor, and electrical operating parameters to ensure functional interchangeability in circuit applications.

Key Parameters

Parameter	Value
Memory Size	2Kbit
Memory Organization	256 x 8
Memory Interface	SPI
Clock Frequency	10 MHz
Supply Voltage Range	2.5V ~ 5.5V
Operating Temperature Range	-40°C ~ 125°C
Write Cycle Time	5ms
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 25LC020AT-E/ST are grouped based on the following critical parameters that determine functional interchangeability:

Core Matching Criteria:

Memory capacity: 2Kbit (256 x 8 organization)
Interface protocol: SPI
Package form factor: 8-TSSOP surface mount
Supply voltage compatibility: Minimum 2.5V support required
Operating temperature range: Minimum -40°C to 125°C support required

Substitution Categories:

Category 1: Direct Equivalents (Identical Specifications) Parts matching all core parameters including 10 MHz clock frequency, 2.5V–5.5V supply range, and -40°C to 125°C temperature range with standard MSL rating.

Category 2: Enhanced Performance Substitutes (Higher Clock Frequency) Parts with 20 MHz clock frequency capability while maintaining 2Kbit capacity and 8-TSSOP packaging. These parts operate at higher speed but remain backward compatible in applications not requiring the full 10 MHz specification.

Category 3: Automotive Grade Substitutes (AEC-Q100 Qualified) Parts with automotive qualification and AEC-Q100 certification, suitable for applications requiring automotive-grade reliability and extended temperature support.

Category 4: Obsolete Status Parts Parts no longer in active production but available in inventory, listed for reference in legacy system support scenarios.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Memory Size	Clock Frequency (MHz)	Supply Voltage (V)	Operating Temperature (°C)	Write Cycle Time (ms)	Package	Product Status	Automotive Grade	Inventory (Pcs)
25LC020AT-E/ST	Microchip Technology	2Kbit	10	2.5 ~ 5.5	-40 ~ 125	5	8-TSSOP	Active	No	699
AT25020B-XHL-B	Microchip Technology	2Kbit	20	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	Active	No	1961
AT25020B-XHL-T	Microchip Technology	2Kbit	20	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	Active	No	3408
BR25H020FVT-2CE2	Rohm Semiconductor	2Kbit	10	2.5 ~ 5.5	-40 ~ 125	4	8-TSSOP	Active	Yes (AEC-Q100)	6854
CAT25020YI-G	onsemi	2Kbit	Not specified	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	Obsolete	No	948
CAT25020YI-GT3	onsemi	2Kbit	20	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	Active	No	3000
CAV25020YE-GT3	onsemi	2Kbit	10	2.5 ~ 5.5	-40 ~ 125	5	8-TSSOP	Active	Yes (AEC-Q100)	859
M95020-DRDW3TP/K	STMicroelectronics	2Kbit	20	1.8 ~ 5.5	-40 ~ 125	4	8-TSSOP	Active	Yes (AEC-Q100)	8927
M95020-RDW6TP	STMicroelectronics	2Kbit	20	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	Active	No	8105
M95020-WDW6TP	STMicroelectronics	2Kbit	20	2.5 ~ 5.5	-40 ~ 85	5	8-TSSOP	Active	No	4709

Engineering Selection Recommendations

For Direct Replacement (Identical Operating Conditions): BR25H020FVT-2CE2 and CAV25020YE-GT3 provide direct functional equivalence to the 25LC020AT-E/ST, maintaining 10 MHz clock frequency, 2.5V–5.5V supply range, and -40°C to 125°C operating temperature. Both parts are in active production status. BR25H020FVT-2CE2 offers 4ms write cycle time versus the original 5ms specification. CAV25020YE-GT3 is automotive-qualified with AEC-Q100 certification.

For Enhanced Performance Applications: AT25020B-XHL-T, CAT25020YI-GT3, M95020-DRDW3TP/K, M95020-RDW6TP, and M95020-WDW6TP support 20 MHz clock frequency operation. These parts are suitable for applications requiring higher SPI bus speeds. M95020-DRDW3TP/K combines 20 MHz operation with automotive AEC-Q100 qualification and extended temperature range (-40°C to 125°C).

For Automotive Applications: BR25H020FVT-2CE2, CAV25020YE-GT3, and M95020-DRDW3TP/K carry AEC-Q100 automotive qualification. These parts are appropriate for automotive-grade system requirements.

For Industrial Temperature Range (-40°C to 125°C): 25LC020AT-E/ST, BR25H020FVT-2CE2, CAV25020YE-GT3, and M95020-DRDW3TP/K support the full industrial temperature range. Parts with reduced temperature range (-40°C to 85°C) include AT25020B-XHL-B, AT25020B-XHL-T, CAT25020YI-G, CAT25020YI-GT3, M95020-RDW6TP, and M95020-WDW6TP.

Avoid Obsolete Parts: CAT25020YI-G is listed as obsolete and should not be selected for new designs despite available inventory.

Frequently Asked Questions (FAQ)

Q: Can AT25020B-XHL-T replace 25LC020AT-E/ST in all applications? A: AT25020B-XHL-T is functionally compatible for SPI EEPROM operations at 2Kbit capacity in 8-TSSOP packaging. However, it operates at 20 MHz clock frequency versus the original 10 MHz and supports only -40°C to 85°C temperature range versus -40°C to 125°C. Verify application clock frequency requirements and operating temperature specifications before substitution.

Q: What is the difference between BR25H020FVT-2CE2 and 25LC020AT-E/ST? A: Both parts match core specifications: 2Kbit capacity, 10 MHz clock frequency, 2.5V–5.5V supply range, -40°C to 125°C operating temperature, and 8-TSSOP packaging. BR25H020FVT-2CE2 features 4ms write cycle time (versus 5ms), carries AEC-Q100 automotive qualification, and is manufactured by Rohm Semiconductor instead of Microchip Technology.

Q: Is M95020-DRDW3TP/K suitable for automotive applications? A: Yes. M95020-DRDW3TP/K carries AEC-Q100 automotive qualification and is manufactured by STMicroelectronics. It supports 20 MHz clock frequency, 1.8V–5.5V supply range, -40°C to 125°C operating temperature, and 4ms write cycle time in 8-TSSOP packaging.

Q: Why do some substitute parts have lower operating temperature ranges? A: Operating temperature range is determined by device design and qualification testing. Parts with -40°C to 85°C range are qualified for standard industrial applications. Parts with -40°C to 125°C range undergo additional qualification for extended temperature operation and are suitable for high-temperature environments.

Q: Can I use CAT25020YI-G as a substitute? A: CAT25020YI-G is obsolete and no longer in active production. Although inventory is available, it should not be selected for new designs. Use active production alternatives such as CAT25020YI-GT3 instead.

Q: What packaging options are available for 2Kbit SPI EEPROM substitutes? A: All listed substitute parts use 8-TSSOP (0.173", 4.40mm Width) surface mount packaging, matching the original 25LC020AT-E/ST package form factor. Packaging differences exist only in supply format: Tape & Reel (TR) or Tube.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the original 25LC020AT-E/ST environmental compliance requirement.

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