AS6C4008-55BIN Equivalent & Substitute Parts

Part Overview

The AS6C4008-55BIN is a 4Mbit asynchronous SRAM memory IC manufactured by Alliance Memory, Inc., configured as 512K x 8 with parallel interface architecture. This component operates across a wide supply voltage range of 2.7V to 5.5V with a 55 ns access time and write cycle time. The device is housed in a 36-TFBGA (6x8) surface mount package and maintains active product status with full RoHS3 compliance and REACH unaffected designation.

Substitute parts become necessary when inventory constraints exist, when design requirements demand faster access times, or when alternative voltage specifications better match system requirements while maintaining functional and mechanical compatibility.

Substiute Parts

AS6C4008-55BIN

Alliance Memory, Inc.In Stock: 793AS6C4008-55BIN Datasheet

Current PartRFQ

IS61WV5128BLL-10BLI

ISSI, Integrated Silicon Solution IncIn Stock: 2003IS61WV5128BLL-10BLI Datasheet

MFR RecommendedRFQ

IS62WV5128EBLL-45BLI

ISSI, Integrated Silicon Solution IncIn Stock: 3352IS62WV5128EBLL-45BLI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AS6C4008-55BIN is determined by strict adherence to the following parameters:

Mandatory Compatibility Parameters:

• Memory Size: 4Mbit (exact match required)
• Memory Organization: 512K x 8 (exact match required)
• Memory Interface: Parallel (exact match required)
• Package Type: 36-TFBGA (6x8) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)

Allowable Variation Parameters:

• Access Time: May be equal to or faster than 55 ns
• Write Cycle Time: May be equal to or faster than 55 ns
• Voltage Supply Range: Must encompass or be compatible with system operating voltage; narrower ranges are acceptable if they fall within the original specification

Both identified substitute parts meet all mandatory compatibility requirements. The IS61WV5128BLL-10BLI offers faster access and write cycle times (10 ns) with a narrower voltage range (2.4V ~ 3.6V). The IS62WV5128EBLL-45BLI provides comparable performance (45 ns) with an extended lower voltage threshold (2.2V ~ 3.6V).

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain active product status and full regulatory compliance (RoHS3 and REACH unaffected). Selection between the AS6C4008-55BIN and its substitutes depends on system voltage requirements and performance specifications.

For systems operating within the 2.7V to 3.6V range, the IS62WV5128EBLL-45BLI provides the closest performance match to the original part with 45 ns access and write cycle times, representing a 9 ns performance improvement while maintaining near-equivalent electrical characteristics.

For systems requiring maximum performance headroom or operating at lower voltage thresholds (2.2V minimum), the IS61WV5128BLL-10BLI delivers significantly faster access times (10 ns) but operates within a narrower voltage window (2.4V ~ 3.6V), requiring verification that system supply voltages remain within this specification.

For systems requiring the original wide voltage tolerance (2.7V ~ 5.5V), the AS6C4008-55BIN remains the appropriate selection, as neither substitute accommodates the full upper voltage range.

Frequently Asked Questions (FAQ)

Q: Can IS61WV5128BLL-10BLI be used as a direct replacement for AS6C4008-55BIN?

A: Direct replacement is possible only if system supply voltage remains within 2.4V to 3.6V. The substitute offers superior access time (10 ns vs. 55 ns) but does not support the original part's upper voltage specification (5.5V). Verify system voltage requirements before substitution.

Q: What is the primary difference between the two ISSI substitutes?

A: IS61WV5128BLL-10BLI operates at 10 ns access time with voltage range 2.4V ~ 3.6V. IS62WV5128EBLL-45BLI operates at 45 ns access time with extended lower voltage support (2.2V ~ 3.6V). Both are electrically and mechanically compatible with the original part.

Q: Are all three parts pin-compatible?

A: Yes. All three parts share identical 36-TFBGA (6x8) package geometry, pin count, and pinout configuration. Surface mount assembly compatibility is maintained across all variants.

Q: Do substitute parts maintain the same compliance certifications?

A: Yes. Both ISSI substitutes carry RoHS3 compliance and REACH unaffected status matching the original Alliance Memory part. MSL rating remains 3 (168 Hours) across all variants.

Q: Can faster access time substitutes be used in applications designed for 55 ns operation?

A: Yes. Faster access time components are backward compatible with designs specifying 55 ns or slower operation. No design modifications are required when substituting with faster parts, provided voltage specifications align with system requirements.