AK6420AF EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AK6420AF is a 2Kbit EEPROM memory IC manufactured by Asahi Kasei Microdevices (AKM) in an 8-SOP surface mount package. This device operates as a non-volatile serial memory with SPI interface capability at 1 MHz clock frequency, supporting a supply voltage range of 1.8V to 5.5V across an operating temperature range of -40°C to 85°C. The AK6420AF is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Substiute Parts

AK6420AF

Asahi Kasei Microdevices/AKMIn Stock: 2257AK6420AF Datasheet

Current PartRFQ

BR93L56FJ-WE2

Rohm SemiconductorIn Stock: 1211BR93L56FJ-WE2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AK6420AF is determined by strict equivalence across the following critical parameters:

• Memory capacity: 2Kbit minimum
• Memory organization: 128 x 16 bit structure
• Package form factor: 8-SOIC (0.154", 3.90mm Width) surface mount
• Supply voltage compatibility: 1.8V ~ 5.5V range
• Operating temperature range: -40°C ~ 85°C minimum
• Non-volatile EEPROM technology
• Moisture sensitivity: MSL 1 or better

The BR93L56FJ-WE2 qualifies as a direct substitute based on matching memory capacity, organization, package dimensions, voltage range, and temperature specifications. Interface protocol differences (Microwire versus SPI) represent a functional distinction that must be evaluated within the context of specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The BR93L56FJ-WE2 is available as an active product from Rohm Semiconductor with verified programmability status and ROHS3 compliance certification. This substitute maintains electrical and mechanical compatibility with the AK6420AF across all critical parameters including memory capacity, package footprint, voltage range, and temperature specifications.

The BR93L56FJ-WE2 operates at 2 MHz clock frequency, providing increased performance margin relative to the AK6420AF specification of 1 MHz. The Microwire interface protocol differs from the SPI interface of the original part; however, both are serial communication protocols supporting the same 2Kbit memory organization and access patterns.

Selection of the BR93L56FJ-WE2 is supported by its active product status, eliminating obsolescence risk associated with the AK6420AF, and by its compliance certifications including ROHS3 and REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: Can the BR93L56FJ-WE2 be used as a direct pin-for-pin replacement for the AK6420AF?

A: Both devices share identical 8-SOIC package dimensions (0.154", 3.90mm Width) and surface mount configuration. Pin compatibility requires verification of signal assignments within the specific application circuit, as the Microwire and SPI protocols utilize different pin definitions for serial communication.

Q: What is the functional difference between SPI and Microwire interfaces?

A: Both SPI and Microwire are serial communication protocols for memory access. The protocols differ in signal timing and pin usage. Application circuits designed for one protocol require interface adaptation to operate with the other protocol.

Q: Are there additional substitute parts listed for the BR93L56FJ-WE2?

A: The BR93L56FJ-WE2 cross-references to the following equivalent part numbers: 93LC56BXT-I/SN, 93LC56B-I/SN, and BR93L56RFJ-WE2. These parts share identical memory specifications and package configuration.

Q: What is the significance of the MSL 1 moisture sensitivity rating?

A: MSL 1 indicates unlimited shelf life without moisture bake requirements prior to soldering. Both the AK6420AF and BR93L56FJ-WE2 carry this rating, eliminating moisture management as a substitution constraint.

Q: Does the higher clock frequency of the BR93L56FJ-WE2 affect compatibility?

A: The 2 MHz specification of the BR93L56FJ-WE2 represents maximum operating frequency. Applications designed for 1 MHz operation remain compatible, as the substitute device operates at or below the original specification without functional degradation.