AT49F002-12TC Equivalent & Substitute Parts

Part Overview

The AT49F002-12TC is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, packaged in 32-TSOP with 120 ns access time and 50µs write cycle time. This component is classified as obsolete, making equivalent or substitute parts necessary for new designs, legacy system repairs, or production continuity. The part operates within a 4.5V to 5.5V supply voltage range and supports 0°C to 70°C operating temperatures.

Substiute Parts

AT49F002-12TC

Microchip TechnologyIn Stock: 910AT49F002-12TC Datasheet

Current PartRFQ

IS61C5128AS-25QLI

ISSI, Integrated Silicon Solution IncIn Stock: 1965IS61C5128AS-25QLI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT49F002-12TC is constrained by the following critical parameters:

• Memory Interface: Parallel interface requirement limits candidates to parallel memory architectures
• Voltage Supply Compatibility: 4.5V ~ 5.5V operating range must be maintained
• Package Compatibility: 32-pin surface mount package (32-TSOP or equivalent pin-compatible variants)
• Memory Organization: 256K x 8 or compatible addressing schemes
• Access Time Performance: 120 ns or faster to maintain system timing specifications

The substitute part IS61C5128AS-25QLI meets the parallel interface, voltage supply, and package pin-count requirements. However, this part differs in memory type (SRAM vs. FLASH), memory size (4Mbit vs. 2Mbit), and memory organization (512K x 8 vs. 256K x 8). These differences indicate functional divergence and require system-level evaluation before implementation.

Parameter Comparison

Engineering Selection Recommendations

The IS61C5128AS-25QLI presents a parallel memory interface with compatible voltage supply specifications and active product status. However, the fundamental difference between FLASH (non-volatile) and SRAM (volatile) memory types introduces functional constraints that must be evaluated at the system architecture level.

The substitute part offers superior access time (25 ns vs. 120 ns) and write cycle performance (25 ns vs. 50µs), along with extended operating temperature range (-40°C to 85°C vs. 0°C to 70°C) and ROHS3 compliance. The increased memory capacity (4Mbit vs. 2Mbit) and organization (512K x 8 vs. 256K x 8) require address decoding verification.

Selection should prioritize product status (Active vs. Obsolete) and regulatory compliance (ROHS3 vs. non-compliant) when system requirements permit functional substitution. Pin-to-pin compatibility and address/data line mapping must be confirmed before implementation.

Frequently Asked Questions (FAQ)

Q: Can IS61C5128AS-25QLI directly replace AT49F002-12TC in existing designs?

A: Direct replacement requires verification of address line utilization, data retention requirements, and power management. The SRAM volatility necessitates system-level power backup or initialization routines if the original design relied on FLASH non-volatility.

Q: What are the package compatibility considerations?

A: Both parts use 32-pin surface mount packages (32-TSOP vs. 32-SOP). Physical footprint and pin pitch must be confirmed for PCB compatibility. Pin assignment and signal mapping require schematic-level verification.

Q: How do memory organization differences affect substitution?

A: The AT49F002-12TC uses 256K x 8 organization while IS61C5128AS-25QLI uses 512K x 8. Address line A18 and higher are unused in the original part and must be tied appropriately in the substitute configuration.

Q: What compliance advantages does the substitute offer?

A: IS61C5128AS-25QLI is ROHS3 compliant and carries Active product status, ensuring long-term availability and regulatory alignment. The AT49F002-12TC is obsolete and non-compliant, limiting procurement and regulatory acceptance.

Q: Are there performance implications when substituting?

A: The substitute provides faster access time (25 ns vs. 120 ns) and write cycle performance (25 ns vs. 50µs), which are generally beneficial. Operating temperature range is extended (-40°C to 85°C vs. 0°C to 70°C), supporting broader environmental applications.