IDT71256SA25TP Equivalent & Substitute Parts

Part Overview

The IDT71256SA25TP is a 256Kbit asynchronous SRAM (Static Random Access Memory) IC manufactured by Renesas Electronics Corporation. This parallel memory device features a 32K x 8 organization with 25 ns access and write cycle times, housed in a 28-pin DIP package. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance, repair, and legacy equipment support.

Substiute Parts

IDT71256SA25TP

Renesas Electronics CorporationIn Stock: 979IDT71256SA25TP Datasheet

Current PartRFQ

71256SA25TPG

Renesas Electronics CorporationIn Stock: 198271256SA25TPG Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IDT71256SA25TP is determined by strict equivalence across the following critical parameters:

• Memory capacity: 256Kbit minimum
• Organization: 32K x 8 configuration
• Access time: 25 ns or faster
• Write cycle time: 25 ns or faster
• Supply voltage range: 4.5V ~ 5.5V compatible
• Package: 28-DIP through-hole form factor
• Memory interface: Parallel architecture

The identified substitute part 71256SA25TPG meets all these criteria while offering improved compliance status and availability.

Parameter Comparison

Engineering Selection Recommendations

The 71256SA25TPG serves as a direct functional equivalent to the IDT71256SA25TP. Both parts share identical electrical specifications, memory organization, and package geometry, enabling pin-for-pin replacement in 28-DIP through-hole applications.

The 71256SA25TPG offers superior compliance status, meeting ROHS3 requirements compared to the non-compliant original part. This distinction is relevant for applications subject to environmental or regulatory compliance mandates. Both parts maintain REACH Unaffected status and EAR99 export classification.

Inventory availability differs between the two parts, with 71256SA25TPG currently stocked at higher quantities (1956 pcs) versus the original part (918 pcs), supporting procurement planning for legacy system support and repair operations.

Frequently Asked Questions (FAQ)

Q: Can 71256SA25TPG replace IDT71256SA25TP in existing circuit boards?

A: Yes. The 71256SA25TPG is a direct substitute with identical electrical parameters, memory organization, and 28-DIP package dimensions. No circuit modifications are required for replacement.

Q: Are there timing differences between these parts?

A: No. Both parts specify 25 ns access time and 25 ns write cycle time. They are electrically equivalent for timing-critical applications.

Q: What is the significance of the RoHS compliance difference?

A: The 71256SA25TPG meets ROHS3 compliance standards, while the IDT71256SA25TP does not. This distinction applies to applications subject to environmental regulations or customer compliance requirements. Functionally, both parts operate identically.

Q: Are these parts suitable for new designs?

A: Both parts carry obsolete product status. They are appropriate for legacy system maintenance and repair only. New designs should evaluate current-generation memory solutions.

Q: Does packaging format affect electrical performance?

A: No. The tube packaging of 71256SA25TPG versus bulk packaging of IDT71256SA25TP affects handling and storage only. Electrical specifications and performance remain identical.

Q: What supply voltage range do these parts require?

A: Both parts operate within 4.5V to 5.5V supply voltage range, compatible with standard 5V logic systems.