AK6440AF EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AK6440AF is a 4Kbit EEPROM memory IC manufactured by Asahi Kasei Microdevices (AKM) in an 8-SOP surface mount package. This device operates as a non-volatile memory component with SPI interface capability at 1 MHz clock frequency, supporting supply voltages from 1.8V to 5.5V across an operating temperature range of -40°C to 85°C.

The AK6440AF is classified as obsolete. Locating equivalent substitute components is necessary for ongoing system support, maintenance, and new production requirements where original stock is unavailable or depleted.

Substiute Parts

AK6440AF

Asahi Kasei Microdevices/AKMIn Stock: 1110AK6440AF Datasheet

Current PartRFQ

S-93C66BR0I-J8T1U

ABLIC Inc.In Stock: 4223S-93C66BR0I-J8T1U Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AK6440AF is determined by the following critical parameters:

• Memory Capacity: 4Kbit capacity requirement
• Memory Organization: 256 x 16 bit structure
• Package Compatibility: 8-SOIC (0.154", 3.90mm Width) surface mount package
• Supply Voltage Range: 1.8V ~ 5.5V compatibility
• Operating Temperature Range: -40°C ~ 85°C capability
• Moisture Sensitivity: MSL 1 rating

The S-93C66BR0I-J8T1U qualifies as a substitute based on matching memory capacity, organization, package type, voltage range, and temperature specifications. Interface differences (Microwire vs. SPI) and clock frequency variations (2 MHz vs. 1 MHz) are secondary considerations that do not preclude substitution in applications where protocol compatibility can be accommodated.

Parameter Comparison

Engineering Selection Recommendations

The S-93C66BR0I-J8T1U presents a viable substitute for the obsolete AK6440AF based on matching core memory specifications and package compatibility. The substitute device carries ROHS3 compliance certification, providing regulatory advantage for applications subject to environmental standards.

The primary distinction between these components is the memory interface protocol: the AK6440AF implements SPI, while the S-93C66BR0I-J8T1U implements Microwire. This difference requires firmware or driver-level protocol adaptation. The S-93C66BR0I-J8T1U operates at 2 MHz clock frequency, which exceeds the AK6440AF specification of 1 MHz, providing operational headroom.

Both devices share identical supply voltage ranges (1.8V ~ 5.5V), operating temperature specifications (-40°C ~ 85°C), and moisture sensitivity ratings (MSL 1). Physical package dimensions are identical, enabling direct PCB footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can the S-93C66BR0I-J8T1U be used as a direct pin-for-pin replacement for the AK6440AF?

A: Yes, the S-93C66BR0I-J8T1U is pin-compatible with the AK6440AF. Both devices use the 8-SOIC package with identical physical dimensions (0.154", 3.90mm Width). However, the memory interface protocol differs (Microwire vs. SPI), requiring software or firmware modifications to accommodate the protocol change.

Q: What are the key differences between these two components?

A: The primary differences are memory interface protocol (SPI vs. Microwire) and clock frequency (1 MHz vs. 2 MHz). Both devices provide identical 4Kbit capacity with 256 x 16 organization, matching voltage ranges, temperature specifications, and package types.

Q: Is the S-93C66BR0I-J8T1U suitable for new designs?

A: The S-93C66BR0I-J8T1U carries a "Not For New Designs" product status designation. For new development, alternative current-generation EEPROM components should be evaluated. This substitute is appropriate for legacy system maintenance and production support where the AK6440AF is unavailable.

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

A: The S-93C66BR0I-J8T1U is certified ROHS3 compliant and REACH unaffected. The AK6440AF compliance status is not specified in available documentation. Both devices carry EAR99 export classification and identical HTSUS codes (8542.32.0051).

Q: What is the moisture sensitivity rating for both components?

A: Both the AK6440AF and S-93C66BR0I-J8T1U carry MSL 1 (Unlimited) moisture sensitivity ratings, indicating no moisture-related handling restrictions during storage or assembly.