Equivalent & Substitute Parts for 602-20011 EEPROM Memory IC

Part Overview

The Parallax Inc. 602-20011 is a 4Kbit SPI EEPROM memory IC in 8-SOIC surface mount packaging, operating at 2 MHz clock frequency with a supply voltage range of 1.8V to 5.5V. This part is classified as obsolete, making equivalent and substitute components necessary for ongoing design support and production continuity. The 4Kbit capacity with 512 x 8 memory organization and SPI interface defines the functional requirements for identifying compatible alternatives across multiple manufacturers.

Key Parameters

Parameter	Value
Memory Size	4Kbit
Memory Organization	512 x 8
Memory Interface	SPI
Clock Frequency	2 MHz
Write Cycle Time	6ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 602-20011 is determined by strict adherence to the following core parameters:

Critical Parameters (Must Match):

Memory Size: 4Kbit
Memory Organization: 512 x 8
Memory Interface: SPI
Package Type: 8-SOIC (0.154", 3.90mm Width)
Voltage Supply Range: 1.8V ~ 5.5V (minimum overlap required)
Operating Temperature Range: -40°C minimum and 85°C maximum (minimum overlap required)

Allowable Variations:

Clock Frequency: May exceed 2 MHz (higher frequencies are backward compatible)
Write Cycle Time: May be equal to or faster than 6ms
Mounting Type: Surface Mount (consistent across all candidates)

Substitute parts are grouped into two categories: Direct Substitutes (higher clock frequency, same or better performance characteristics) and Compatible Alternatives (different manufacturers, equivalent electrical specifications).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency (MHz)	Write Cycle Time (ms)	Voltage Supply (V)	Operating Temp (°C)	Package	Product Status
602-20011	Parallax Inc.	4Kbit	2	6	1.8 ~ 5.5	-40 ~ 85	8-SOIC	Obsolete
M95040-RMN6TP	STMicroelectronics	4Kbit	20	5	1.8 ~ 5.5	-40 ~ 85	8-SOIC	Active
25AA040-I/SN	Microchip Technology	4Kbit	1	5	1.8 ~ 5.5	-40 ~ 85	8-SOIC	Active
25AA040A-I/SN	Microchip Technology	4Kbit	10	5	1.8 ~ 5.5	-40 ~ 85	8-SOIC	Active
AT25040B-SSHL-B	Microchip Technology	4Kbit	20	5	1.8 ~ 5.5	-40 ~ 85	8-SOIC	Active
BR25L040FJ-WE2	Rohm Semiconductor	4Kbit	5	5	1.8 ~ 5.5	-40 ~ 85	8-SOIC	Not For New Designs
CAT25040VI-G	onsemi	4Kbit	Not Specified	5	1.8 ~ 5.5	-40 ~ 85	8-SOIC	Obsolete
M95040-DFMN6TP	STMicroelectronics	4Kbit	20	5	1.7 ~ 5.5	-40 ~ 85	8-SOIC	Active
M95040-DRMN3TP/K	STMicroelectronics	4Kbit	20	4	1.8 ~ 5.5	-40 ~ 125	8-SOIC	Active
M95040-DRMN8TP/K	STMicroelectronics	4Kbit	20	4	1.8 ~ 5.5	-40 ~ 105	8-SOIC	Active
R1EX25004ASA00I#S0	Renesas Electronics Corporation	4Kbit	5	5	1.8 ~ 5.5	-40 ~ 85	8-SOIC	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

The following parts are classified as Active and meet all critical electrical and mechanical parameters:

M95040-RMN6TP (STMicroelectronics): 20 MHz clock frequency, 5ms write cycle time, ROHS3 compliant. Highest performance option with active product status.
M95040-DRMN3TP/K (STMicroelectronics): Automotive-grade with AEC-Q100 qualification, extended temperature range to 125°C, 4ms write cycle time. Suitable for automotive and industrial applications.
25AA040A-I/SN (Microchip Technology): 10 MHz clock frequency, ROHS3 compliant, active status. Mid-range performance alternative.
AT25040B-SSHL-B (Microchip Technology): 20 MHz clock frequency, ROHS3 compliant, active status. High-performance alternative from established memory manufacturer.
R1EX25004ASA00I#S0 (Renesas Electronics Corporation): 5 MHz clock frequency, ROHS3 compliant, active status. Moderate performance option.

Secondary Substitutes (Limited Availability):

BR25L040FJ-WE2 (Rohm Semiconductor): Classified as Not For New Designs. Use only when primary substitutes are unavailable.
CAT25040VI-G (onsemi): Obsolete status. Use only for legacy system maintenance.

Voltage Supply Consideration:

M95040-DFMN6TP operates at 1.7V minimum (versus 1.8V for the original part). This represents a minor relaxation of the lower voltage boundary and is acceptable for most applications.

Temperature Range Consideration:

M95040-DRMN3TP/K and M95040-DRMN8TP/K extend the upper operating temperature to 125°C and 105°C respectively, exceeding the original 85°C specification. These parts are suitable for applications requiring enhanced thermal performance.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a higher clock frequency than the original 602-20011?

A: Yes. Higher clock frequencies are backward compatible. A 20 MHz part operates correctly in circuits designed for 2 MHz operation. The SPI interface remains identical, and data transfer rates are determined by the host controller, not the memory device.

Q: What is the difference between the various STMicroelectronics M95040 variants?

A: The M95040 family shares the same 4Kbit capacity and SPI interface but differs in packaging format (RMN6TP = Cut Tape & Digi-Reel, DFMN6TP = Tape & Reel, DRMN3TP/K = Cut Tape & Digi-Reel with automotive qualification). The DRMN variants include AEC-Q100 automotive qualification and extended temperature ranges.

Q: Is the 8-SOIC package identical across all substitute parts?

A: The package designation is 8-SOIC (0.154", 3.90mm Width) for all listed substitutes. However, BR25L040FJ-WE2 uses an 8-SOP-J variant and R1EX25004ASA00I#S0 uses an 8-SOP variant. These are mechanically compatible with 8-SOIC footprints but may have minor pin configuration differences. Verify pinout compatibility with datasheets before PCB layout.

Q: Which substitute offers the fastest write cycle time?

A: M95040-DRMN3TP/K and M95040-DRMN8TP/K both offer 4ms write cycle time, compared to 6ms for the original part. This represents a 33% improvement in write performance.

Q: Are all substitute parts RoHS3 compliant?

A: All listed Active and Not For New Designs parts are ROHS3 compliant. The obsolete parts (602-20011 and CAT25040VI-G) do not specify RoHS status.

Q: Can I use 25AA040-I/SN as a direct replacement if my application only requires 1 MHz operation?

A: Yes. The 25AA040-I/SN operates at 1 MHz, which is below the original 2 MHz specification. However, this part is fully compatible with the 602-20011 electrical and mechanical parameters. Use this part only if your application does not require the full 2 MHz bandwidth.

Q: What is the significance of the automotive-grade M95040-DRMN3TP/K?

A: This part carries AEC-Q100 automotive qualification and operates across -40°C to 125°C, making it suitable for automotive and industrial applications requiring extended temperature performance. Standard commercial-grade substitutes operate to 85°C maximum.

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