AT27C4096-12VC Equivalent & Substitute Parts

Part Overview

The AT27C4096-12VC is a 4Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology, packaged in a 40-VSOP surface mount configuration with 120 ns access time. This part is classified as obsolete, making substitute components necessary for new designs, maintenance, or production continuity. The AT27C4096 series shares a common base product number across multiple package and speed variants, enabling direct functional substitution where electrical and mechanical parameters align.

Substiute Parts

AT27C4096-12VC

Microchip TechnologyIn Stock: 1132AT27C4096-12VC Datasheet

Current PartRFQ

AT27C4096-90PU

Microchip TechnologyIn Stock: 1800AT27C4096-90PU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT27C4096-12VC is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Memory capacity: 4Mbit (256K x 16 organization)
• Memory type: EPROM (Non-Volatile, OTP technology)
• Interface: Parallel
• Supply voltage: 4.5V ~ 5.5V
• Access time: Equal to or faster than 120 ns

Mechanical Compatibility Considerations:

• Package type and pin count (40-pin configuration)
• Mounting method (surface mount or through-hole)
• Physical dimensions and footprint

The AT27C4096-90PU qualifies as a substitute because it maintains identical electrical specifications (4Mbit capacity, parallel EPROM interface, 4.5V ~ 5.5V supply) while offering improved access time (90 ns versus 120 ns). The primary difference is the package format: the substitute uses a 40-DIP through-hole package instead of the 40-VSOP surface mount package, requiring PCB redesign or adapter solutions for direct replacement.

Parameter Comparison

Engineering Selection Recommendations

Electrical Substitution Validity: The AT27C4096-90PU is electrically compatible with the AT27C4096-12VC. Both components share identical memory capacity, organization, interface type, and supply voltage specifications. The substitute offers superior access time (90 ns versus 120 ns), making it functionally interchangeable from an electrical standpoint.

Product Status and Compliance Advantages: The AT27C4096-90PU holds active product status, whereas the main part is obsolete. The substitute meets ROHS3 compliance requirements, compared to the non-compliant status of the AT27C4096-12VC. The substitute also features improved moisture sensitivity rating (MSL 1 versus MSL 3), reducing handling and storage constraints.

Operational Temperature Consideration: The substitute supports an extended operating temperature range (-40°C ~ 85°C) compared to the main part (0°C ~ 70°C). This expanded range provides greater flexibility for applications requiring operation outside the original specification.

Package and Mounting Constraints: Direct physical substitution requires PCB modification. The main part uses a 40-VSOP surface mount package, while the substitute uses a 40-DIP through-hole package. Component footprints and mounting methods differ, necessitating either PCB redesign or the use of adapter solutions for mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the AT27C4096-90PU replace the AT27C4096-12VC in existing designs without modification?

A: Electrical substitution is valid; however, physical substitution requires PCB modification due to different package types. The main part uses surface mount (40-VSOP), while the substitute uses through-hole (40-DIP). Adapter solutions or PCB redesign are necessary for direct replacement.

Q: What are the key electrical differences between these parts?

A: Both parts are electrically identical in terms of memory capacity (4Mbit), organization (256K x 16), interface type (parallel), and supply voltage (4.5V ~ 5.5V). The substitute offers faster access time (90 ns versus 120 ns) and supports a wider operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C).

Q: Why is the AT27C4096-12VC classified as obsolete?

A: The AT27C4096-12VC is marked obsolete by the manufacturer. The AT27C4096-90PU maintains active product status, making it the recommended choice for new designs and ongoing production requirements.

Q: Does the substitute meet modern compliance standards?

A: Yes. The AT27C4096-90PU is ROHS3 compliant and features improved moisture sensitivity characteristics (MSL 1 versus MSL 3), reducing environmental handling constraints compared to the obsolete main part.

Q: Are there any timing considerations when substituting these parts?

A: The substitute's faster access time (90 ns) is advantageous and does not introduce compatibility issues. Systems designed for 120 ns access time will operate correctly with the 90 ns substitute without timing violations.

Q: What is the impact of different package types on system design?

A: Package differences require mechanical redesign. Surface mount (VSOP) and through-hole (DIP) packages have different footprints, pin spacing, and mounting methods. PCB layout and assembly processes must be adapted accordingly.