AT27C4096-90JC EPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT27C4096-90JC is a 4Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 44-PLCC surface mount package. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and component procurement. The part operates with a 90 ns access time and supports standard 5V logic levels, making it suitable for legacy embedded systems and industrial applications requiring non-volatile memory storage.

Substiute Parts

AT27C4096-90JC

Microchip TechnologyIn Stock: 2301AT27C4096-90JC Datasheet

Current PartRFQ

AT27C4096-90JU

Microchip TechnologyIn Stock: 6127AT27C4096-90JU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT27C4096-90JC is determined by strict equivalence across the following critical parameters:

• Memory capacity: 4Mbit
• Memory organization: 256K x 16
• Memory technology: EPROM - OTP (One-Time Programmable)
• Parallel interface architecture
• Access time: 90 ns
• Supply voltage range: 4.5V ~ 5.5V
• Physical package: 44-PLCC (16.6x16.6)
• Surface mount configuration

The AT27C4096-90JU meets all substitution criteria as a direct equivalent part from the same manufacturer, differing only in packaging format (tube vs. standard packaging) and product lifecycle status.

Parameter Comparison

Engineering Selection Recommendations

The AT27C4096-90JU is the direct functional equivalent for the obsolete AT27C4096-90JC. Both parts share identical electrical specifications, memory architecture, and physical packaging. The primary distinctions are product lifecycle status and regulatory compliance:

The AT27C4096-90JU maintains active product status with verified programmability and ROHS3 compliance certification, whereas the AT27C4096-90JC is classified as obsolete and non-compliant with current RoHS standards. The AT27C4096-90JU supports an extended operating temperature range (-40°C ~ 85°C) compared to the original part (0°C ~ 70°C), providing broader environmental compatibility for industrial applications.

Selection of the AT27C4096-90JU is appropriate for new designs, system upgrades, and component replacement scenarios where regulatory compliance and long-term availability are required.

Frequently Asked Questions (FAQ)

Q: Are AT27C4096-90JC and AT27C4096-90JU pin-compatible?

A: Yes. Both parts use identical 44-PLCC J-Lead packaging with matching pinout configurations. Direct socket substitution is possible without circuit board modifications.

Q: What is the difference between the two part numbers?

A: The suffix designations indicate packaging format differences. The AT27C4096-90JC and AT27C4096-90JU are electrically identical 4Mbit EPROM devices with the same memory organization, access time, and voltage specifications. The primary distinction is product status: AT27C4096-90JU is currently active in production, while AT27C4096-90JC is obsolete.

Q: Can AT27C4096-90JU replace AT27C4096-90JC in existing systems?

A: Yes. The AT27C4096-90JU is a direct substitute meeting all electrical and mechanical requirements. The extended operating temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C) provides additional environmental margin for legacy system applications.

Q: What are the RoHS compliance implications?

A: The AT27C4096-90JC is RoHS non-compliant, while AT27C4096-90JU is ROHS3 compliant. For applications subject to RoHS regulations or procurement policies requiring compliant components, the AT27C4096-90JU is the appropriate selection.

Q: Are there any programming differences between these parts?

A: Both parts are OTP (One-Time Programmable) EPROM devices with verified programmability. Programming procedures and algorithms are identical between the two variants.