U6264BDC07LLG1 Equivalent & Substitute Parts

Part Overview

The U6264BDC07LLG1 is a 64Kbit asynchronous SRAM memory IC in 28-DIP packaging manufactured by Alliance Memory, Inc. This parallel interface memory device is designed for applications requiring volatile storage with 70 ns access time and operates across the 4.5V to 5.5V supply voltage range. The product is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing system maintenance, repairs, and legacy equipment support.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	Parallel
Access Time	70 ns
Write Cycle Time	70 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	28-DIP (0.600", 15.24mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the U6264BDC07LLG1 is determined by the following critical parameters:

Memory capacity and organization (64Kbit, 8K x 8 configuration)
Parallel interface architecture
Package type and physical dimensions (28-DIP)
Mounting method (Through Hole)
Operating temperature range (0°C ~ 70°C minimum)
Supply voltage compatibility

The AS6C6264-55PCN qualifies as a direct substitute based on matching memory size, organization, interface type, and package specifications. While the substitute exhibits improved access time (55 ns versus 70 ns) and extended voltage supply range (2.7V ~ 5.5V), these represent performance enhancements rather than incompatibilities. The substitute maintains identical memory organization, parallel interface, and physical packaging required for direct replacement.

Parameter Comparison

Parameter	U6264BDC07LLG1	AS6C6264-55PCN
Manufacturer	Alliance Memory, Inc.	Alliance Memory, Inc.
Memory Type	Volatile SRAM	Volatile SRAM
Memory Size	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8
Memory Interface	Parallel	Parallel
Access Time	70 ns	55 ns
Write Cycle Time	70 ns	55 ns
Voltage Supply Range	4.5V ~ 5.5V	2.7V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Package Type	28-DIP (0.600", 15.24mm)	28-DIP (0.600", 15.24mm)
Mounting Type	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Discontinued	Active

Engineering Selection Recommendations

The AS6C6264-55PCN is suitable for direct replacement of the U6264BDC07LLG1 in applications requiring 64Kbit parallel SRAM with 28-DIP through-hole packaging. Both devices maintain identical RoHS3 and REACH compliance certifications, ensuring regulatory consistency in replacement scenarios.

The substitute part offers improved performance characteristics with 55 ns access time compared to the original 70 ns specification, and extends the minimum supply voltage tolerance to 2.7V. These enhancements provide operational flexibility without introducing compatibility issues. The substitute's active product status ensures ongoing availability for procurement and support.

Selection of the AS6C6264-55PCN is appropriate for legacy system maintenance where the original U6264BDC07LLG1 is no longer available, provided the application circuit accommodates the faster access time and lower voltage threshold.

Frequently Asked Questions (FAQ)

Q: Can the AS6C6264-55PCN directly replace the U6264BDC07LLG1 in existing circuit boards?

A: Yes. Both devices share identical memory capacity (64Kbit), organization (8K x 8), parallel interface architecture, and 28-DIP package dimensions. Direct socket replacement is mechanically and electrically compatible.

Q: What is the significance of the 55 ns versus 70 ns access time difference?

A: The substitute part exhibits faster memory access time. This represents improved performance and does not create compatibility issues in applications designed for the original 70 ns specification. Systems will operate within their original timing requirements.

Q: Does the extended voltage range (2.7V ~ 5.5V) of the substitute affect compatibility?

A: No. The substitute maintains full compatibility with the original 4.5V ~ 5.5V supply range. The extended lower voltage limit provides additional operational flexibility without affecting circuits designed for the original voltage specification.

Q: Are both parts compliant with current environmental and regulatory standards?

A: Yes. Both the U6264BDC07LLG1 and AS6C6264-55PCN are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Why is the original part listed as discontinued?

A: The U6264BDC07LLG1 is discontinued at DiGi Electronics. The AS6C6264-55PCN remains in active production, providing a current-generation alternative for applications requiring 64Kbit parallel SRAM in 28-DIP packaging.

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