AT29C020-12TI Equivalent & Substitute Parts

Part Overview

The AT29C020-12TI is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-TSOP package with 120 ns access time. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part operates within a 4.5V to 5.5V supply range and supports industrial temperature specifications from -40°C to 85°C.

Substiute Parts

AT29C020-12TI

Microchip TechnologyIn Stock: 1327AT29C020-12TI 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 AT29C020-12TI is based on the following critical parameters:

• Memory Interface: Parallel (8-bit data bus architecture)
• Voltage Supply Range: 4.5V ~ 5.5V compatibility
• Operating Temperature Range: -40°C ~ 85°C
• Package Type: 32-pin surface mount configuration
• Pin Count and Pinout Compatibility: 32-pin arrangement

The identified substitute IS61C5128AS-25QLI shares the parallel interface, voltage supply range, operating temperature range, and 32-pin surface mount package. However, this substitute differs in memory type (SRAM vs. FLASH), memory size (4Mbit vs. 2Mbit), and access time (25 ns vs. 120 ns). These differences must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The IS61C5128AS-25QLI substitute is active in production and ROHS3 compliant, addressing the obsolescence and compliance limitations of the AT29C020-12TI. Both parts operate within identical voltage supply ranges (4.5V ~ 5.5V) and temperature specifications (-40°C ~ 85°C), supporting direct electrical compatibility in these domains.

The primary distinction is memory type: the AT29C020-12TI provides non-volatile FLASH storage, while the IS61C5128AS-25QLI provides volatile SRAM. This fundamental difference requires application-level evaluation. The substitute offers superior access time (25 ns vs. 120 ns) and faster write cycle time (25 ns vs. 10 ms), but requires continuous power to retain data.

Package differences exist between 32-TSOP and 32-SOIC configurations. PCB layout and footprint modifications may be necessary. Both packages maintain 32-pin surface mount architecture and are compatible with standard manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can IS61C5128AS-25QLI directly replace AT29C020-12TI in existing designs?

A: Electrical compatibility exists for voltage supply and temperature ranges. However, memory type differences (SRAM vs. FLASH) require application verification. SRAM volatility means data loss upon power removal, whereas FLASH retains data. Package footprint differences (32-TSOP vs. 32-SOIC) necessitate PCB layout modifications.

Q: What are the key differences between these parts?

A: AT29C020-12TI is non-volatile FLASH memory with 2Mbit capacity and 120 ns access time. IS61C5128AS-25QLI is volatile SRAM with 4Mbit capacity and 25 ns access time. Both support parallel interfaces, identical voltage ranges, and industrial temperature specifications.

Q: Does the substitute offer better performance?

A: IS61C5128AS-25QLI provides faster access time (25 ns vs. 120 ns) and write cycle time (25 ns vs. 10 ms). Performance improvement depends on application timing requirements. Memory volatility introduces different operational constraints.

Q: Are there compliance differences?

A: AT29C020-12TI is RoHS non-compliant and obsolete. IS61C5128AS-25QLI is ROHS3 compliant and active in production, supporting modern regulatory requirements and supply chain continuity.

Q: What package considerations apply?

A: AT29C020-12TI uses 32-TSOP packaging; IS61C5128AS-25QLI uses 32-SOIC packaging. Both are surface mount with 32-pin configurations. Physical dimensions differ, requiring PCB footprint redesign and potential layout adjustments.