AK6440AM EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AK6440AM is a 4Kbit EEPROM memory integrated circuit manufactured by Asahi Kasei Microdevices (AKM) in an 8-SSOP surface mount package. This non-volatile memory device operates at 1 MHz via SPI interface with a supply voltage range of 1.8V to 5.5V and temperature range of -40°C to 85°C. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

AK6440AM

Asahi Kasei Microdevices/AKMIn Stock: 25481AK6440AM Datasheet

Current PartRFQ

BR93L66FV-WE2

Rohm SemiconductorIn Stock: 8830BR93L66FV-WE2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AK6440AM are identified based on strict equivalence of core electrical and mechanical parameters. The substitution criteria are:

• Memory capacity: 4Kbit minimum
• Memory organization: 256 x 16 configuration
• Package compatibility: 8-LSSOP form factor (0.173", 4.40mm Width)
• Supply voltage range: 1.8V ~ 5.5V compatibility
• Operating temperature range: -40°C ~ 85°C minimum
• Surface mount technology
• Non-volatile EEPROM technology

The BR93L66FV-WE2 from Rohm Semiconductor meets these core substitution criteria. While this part operates at 2 MHz (higher than the 1 MHz specification of the AK6440AM) and uses Microwire interface protocol instead of SPI, it maintains electrical and mechanical compatibility within the specified parameter envelope. The higher clock frequency and alternative serial interface represent performance enhancements rather than incompatibilities, provided the application circuit supports Microwire protocol operation.

Parameter Comparison

Engineering Selection Recommendations

The BR93L66FV-WE2 is suitable as a substitute for the AK6440AM based on the following factors:

• The substitute part maintains identical electrical specifications for supply voltage (1.8V ~ 5.5V) and operating temperature range (-40°C ~ 85°C)
• Both devices share the same 8-LSSOP package footprint and surface mount configuration, enabling direct PCB layout compatibility
• The substitute part holds active product status with verified programmability, ensuring long-term availability and supply chain stability
• The substitute part is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements
• The 4Kbit memory capacity and 256 x 16 organization are identical, preserving data storage functionality

The primary design consideration is the interface protocol difference: the substitute uses Microwire protocol at 2 MHz versus the original SPI protocol at 1 MHz. This requires circuit-level evaluation to confirm compatibility with the host controller's serial communication capabilities.

Frequently Asked Questions (FAQ)

Q: Can the BR93L66FV-WE2 be used as a direct pin-for-pin replacement for the AK6440AM?

A: Both parts use the 8-LSSOP package with identical physical dimensions (0.173", 4.40mm Width). However, the serial interface protocol differs (Microwire versus SPI), requiring verification that the host controller supports Microwire communication before substitution.

Q: What is the significance of the higher 2 MHz clock frequency in the BR93L66FV-WE2?

A: The 2 MHz specification represents faster data transfer capability compared to the 1 MHz AK6440AM. This is a performance enhancement that does not create incompatibility, provided the application circuit can accommodate the higher frequency operation.

Q: Are there any supply voltage or temperature range limitations when substituting?

A: Both parts operate within identical supply voltage (1.8V ~ 5.5V) and temperature ranges (-40°C ~ 85°C). No additional voltage regulation or thermal management modifications are required for substitution.

Q: What does the write cycle time specification of 5ms for the BR93L66FV-WE2 indicate?

A: The 5ms write cycle time specifies the duration required to complete a single word or page write operation to the EEPROM memory. This parameter was not provided for the AK6440AM but is standard for EEPROM devices in this category.

Q: Why is the AK6440AM classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The BR93L66FV-WE2 maintains active product status with current manufacturing support, making it the recommended alternative for new designs and ongoing system support.

Q: Are there compliance or certification differences between these parts?

A: The BR93L66FV-WE2 carries ROHS3 compliance and REACH unaffected status. Both parts maintain MSL 1 (Unlimited) moisture sensitivity rating. The substitute part's active compliance certifications align with current regulatory requirements.