M95640-RMB6TG Equivalent & Substitute Parts

Part Overview

The M95640-RMB6TG is a 64Kbit EEPROM memory IC manufactured by STMicroelectronics, featuring SPI interface and 20 MHz clock frequency in an 8-UFDFPN (2x3) surface mount package. This part is classified as obsolete, necessitating identification of equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across memory capacity, interface protocol, electrical specifications, and thermal operating range while accommodating packaging variations.

Substiute Parts

M95640-RMB6TG

STMicroelectronicsIn Stock: 292510M95640-RMB6TG Datasheet

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M95640-DFMC6TG

STMicroelectronicsIn Stock: 5780M95640-DFMC6TG Datasheet

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M95640-RMC6TG

STMicroelectronicsIn Stock: 8650M95640-RMC6TG Datasheet

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25AA640AT-I/MNY

Microchip TechnologyIn Stock: 1879325AA640AT-I/MNY Datasheet

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AT25640B-MAHL-T

Microchip TechnologyIn Stock: 2973AT25640B-MAHL-T Datasheet

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CAT25640HU4I-GT3

onsemiIn Stock: 2195CAT25640HU4I-GT3 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the M95640-RMB6TG is determined by the following critical parameters:

Mandatory Compatibility Parameters:

• Memory Size: 64Kbit
• Memory Organization: 8K x 8
• Memory Interface: SPI
• Write Cycle Time: 5ms
• Voltage Supply Range: Minimum 1.8V, Maximum 5.5V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• RoHS3 Compliance
• Moisture Sensitivity Level: 1

Variable Parameters Allowing Substitution:

• Clock Frequency: 10 MHz or 20 MHz (both support the required SPI interface timing)
• Voltage Supply Range: 1.7V ~ 5.5V or 1.8V ~ 5.5V (both encompass the operational envelope)
• Package Designation: 8-UFDFPN, 8-TDFN, or 8-UDFN variants (all 2x3 footprint, surface mount, exposed pad)
• Manufacturer: STMicroelectronics, Microchip Technology, or onsemi
• Product Status: Active or Obsolete (provided all other parameters align)
• Packaging Format: Cut Tape (CT) & Digi-Reel® or Tape & Reel (TR)

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: M95640-RMC6TG

The M95640-RMC6TG is the direct functional equivalent of the M95640-RMB6TG. Both parts are manufactured by STMicroelectronics, share identical electrical specifications (1.8V ~ 5.5V supply, 20 MHz clock frequency, 5ms write cycle time), operate across the same temperature range (-40°C ~ 85°C), and utilize the same 8-UFDFPN (2x3) package footprint. The M95640-RMC6TG maintains active product status and ROHS3 compliance. The only distinction is packaging format: M95640-RMC6TG is supplied in Cut Tape (CT) & Digi-Reel® format, matching the original part's packaging specification.

Secondary Recommendation: M95640-DFMC6TG

The M95640-DFMC6TG provides equivalent functionality with marginally extended voltage supply range (1.7V ~ 5.5V versus 1.8V ~ 5.5V), enabling operation at lower supply voltages. This part maintains 20 MHz clock frequency, 5ms write cycle time, and identical package footprint. The primary distinction is packaging format: M95640-DFMC6TG is supplied in Tape & Reel (TR) format. Active product status and ROHS3 compliance are maintained.

Cross-Manufacturer Alternatives:

AT25640B-MAHL-T (Microchip Technology) and CAT25640HU4I-GT3 (onsemi) provide functional substitution with identical memory capacity, organization, interface, and thermal specifications. AT25640B-MAHL-T matches the 20 MHz clock frequency specification. Both parts are active products with ROHS3 compliance. Package variants (8-UDFN) require PCB layout verification for footprint compatibility.

25AA640AT-I/MNY (Microchip Technology) operates at 10 MHz clock frequency, which is lower than the 20 MHz specification of the original part. This part is suitable only for applications where reduced clock frequency does not impact system performance requirements.

Frequently Asked Questions (FAQ)

Q: Can M95640-DFMC6TG replace M95640-RMB6TG in all applications?

A: Yes. M95640-DFMC6TG provides identical electrical and functional performance. The extended voltage supply range (1.7V minimum versus 1.8V minimum) offers additional operational margin. Packaging format differs (Tape & Reel versus Cut Tape & Digi-Reel), which affects procurement and assembly processes but not electrical compatibility.

Q: What is the significance of clock frequency differences between 10 MHz and 20 MHz parts?

A: Clock frequency determines the maximum SPI communication speed. Parts rated at 10 MHz (25AA640AT-I/MNY, CAT25640HU4I-GT3) operate at half the speed of 20 MHz parts. Substitution of a 10 MHz part for a 20 MHz specification is acceptable only if system timing requirements do not mandate the higher speed. Substitution in the reverse direction (20 MHz for 10 MHz) is always acceptable.

Q: Are package variants (8-UFDFPN, 8-TDFN, 8-UDFN) interchangeable?

A: All variants maintain 2x3 footprint dimensions and surface mount configuration with exposed pad. However, PCB layout and solder pad patterns may differ. Verify package drawings and land pattern specifications before substitution. Mechanical compatibility does not guarantee electrical performance if pad geometry is incompatible with assembly equipment or thermal management design.

Q: Does voltage supply range variation affect substitution eligibility?

A: Voltage supply range variation is acceptable provided the substitute part's range encompasses the application's operating voltage. M95640-DFMC6TG (1.7V ~ 5.5V) encompasses M95640-RMB6TG (1.8V ~ 5.5V) and is therefore compatible. Reverse substitution is acceptable only if the application operates exclusively within 1.8V ~ 5.5V range.

Q: What is the impact of product status (Obsolete versus Active) on substitution?

A: Obsolete status indicates discontinued manufacturing. Active status indicates ongoing production and availability. Substitution from obsolete to active parts is necessary for new designs and long-term production. Reverse substitution (active to obsolete) is not recommended due to supply uncertainty.

Q: Are STMicroelectronics, Microchip Technology, and onsemi parts functionally equivalent?

A: Yes, provided all electrical parameters, memory specifications, and interface protocols match. Manufacturer differences do not affect functional compatibility when specifications align. Verify device datasheets for any manufacturer-specific timing characteristics or protocol variations not captured in the parameter list.

Q: Can 25AA640AT-I/MNY be used as a direct replacement?

A: 25AA640AT-I/MNY is functionally compatible for memory capacity, organization, interface, and thermal specifications. The 10 MHz clock frequency is lower than the 20 MHz specification. Substitution is valid only if system timing does not require 20 MHz operation. Package variant (8-TDFN) requires PCB layout verification.