AT27C2048-90VC Equivalent & Substitute Parts

Part Overview

The AT27C2048-90VC is a 2Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 40-VSOP package. This device is classified as obsolete, indicating it has been discontinued and is no longer in active production. The part operates with a 90 ns access time and supports standard 5V supply voltage operation. Due to its obsolete status, identifying functionally equivalent substitute parts is necessary for ongoing system maintenance, repair, and component sourcing.

Substiute Parts

AT27C2048-90VC

Microchip TechnologyIn Stock: 956AT27C2048-90VC Datasheet

Current PartRFQ

AT27C2048-90JU

Microchip TechnologyIn Stock: 1419AT27C2048-90JU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT27C2048-90VC is determined by the following critical parameters:

Core Functional Parameters (Must Match):

• Memory Size: 2Mbit
• Memory Organization: 128K x 16
• Memory Format: EPROM (OTP technology)
• Memory Interface: Parallel
• Access Time: 90 ns
• Voltage Supply Range: 4.5V ~ 5.5V

Allowable Variations:

• Package Type: Different surface mount packages (40-VSOP, 44-PLCC) are acceptable provided the pin configuration and electrical interface remain compatible
• Operating Temperature Range: Extended temperature ranges are acceptable as they represent enhanced specifications
• Product Status: Active status parts are preferred over obsolete parts
• RoHS Compliance: Upgraded compliance status is acceptable

The AT27C2048-90JU meets all core functional requirements while offering improved product status and compliance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The AT27C2048-90JU is the direct functional equivalent to the AT27C2048-90VC. Both parts share identical memory specifications, access timing, and electrical interface characteristics. The substitute part offers the following advantages:

• Active Product Status: The AT27C2048-90JU is in active production, ensuring long-term availability and supply chain reliability compared to the obsolete main part.
• Enhanced Compliance: ROHS3 compliance and REACH unaffected status provide regulatory alignment for modern applications.
• Improved Moisture Handling: MSL rating of 2 (1 Year) provides superior moisture resistance compared to MSL 3 (168 Hours).
• Extended Temperature Range: Operating range of -40°C ~ 85°C exceeds the original specification of 0°C ~ 70°C, providing greater operational flexibility.

Package differences (40-VSOP versus 44-PLCC) require PCB layout and socket compatibility verification. Pin-to-pin functional mapping must be confirmed during integration.

Frequently Asked Questions (FAQ)

Q: Can the AT27C2048-90JU directly replace the AT27C2048-90VC without circuit modifications?

A: Both parts share identical memory capacity, organization, access time, and supply voltage specifications. However, the package types differ (40-VSOP versus 44-PLCC). Direct socket replacement is not possible without PCB redesign or adapter solutions. Pin configuration and functional mapping must be verified against the respective datasheets.

Q: What is the significance of the different package types?

A: The AT27C2048-90VC uses a 40-pin VSOP (Very Small Outline Package) while the AT27C2048-90JU uses a 44-pin PLCC (Plastic Leaded Chip Carrier) with J-leads. These are physically and electrically distinct packages requiring different PCB footprints and socket designs.

Q: Why is the AT27C2048-90JU listed as active while the main part is obsolete?

A: The AT27C2048-90VC has been discontinued by the manufacturer and is no longer produced. The AT27C2048-90JU remains in active production, making it the preferred choice for new designs and ongoing component sourcing.

Q: Are there any compliance differences between these parts?

A: Yes. The AT27C2048-90JU is ROHS3 compliant with an MSL rating of 2 (1 Year), while the AT27C2048-90VC is RoHS non-compliant with an MSL rating of 3 (168 Hours). These differences may impact suitability for regulated applications and storage requirements.

Q: Does the extended operating temperature range of the substitute part affect compatibility?

A: The AT27C2048-90JU supports -40°C ~ 85°C operation compared to the original 0°C ~ 70°C range. This represents an enhancement that does not reduce compatibility. Applications operating within the original temperature range will function identically on both parts.