AT27C2048-90JC EPROM Equivalent & Substitute Parts

Part Overview

The AT27C2048-90JC is a 2Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 44-PLCC surface mount package. This device operates with a 90 ns access time and is designed for non-volatile memory applications requiring parallel interface connectivity.

The AT27C2048-90JC carries an obsolete product status, making it necessary to identify functionally equivalent alternatives for new designs or ongoing production requirements. Substitute parts must maintain electrical compatibility across memory capacity, access timing, voltage specifications, and physical packaging to ensure direct replacement capability.

Substiute Parts

AT27C2048-90JC

Microchip TechnologyIn Stock: 1228AT27C2048-90JC Datasheet

Current PartRFQ

AT27C2048-90JU

Microchip TechnologyIn Stock: 1419AT27C2048-90JU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT27C2048-90JC is determined by strict equivalence across the following parameters:

• Memory capacity: 2Mbit (128K x 16 organization)
• Memory technology: EPROM - OTP (One-Time Programmable)
• Access time: 90 ns maximum
• Supply voltage: 4.5V to 5.5V operating range
• Physical package: 44-PLCC with identical footprint (16.6x16.6 mm)
• Parallel interface architecture

The AT27C2048-90JU qualifies as a direct substitute based on identical electrical specifications and package compatibility. Differences in operating temperature range and product status do not affect functional substitution within the specified electrical parameters.

Parameter Comparison

Engineering Selection Recommendations

The AT27C2048-90JU is the qualified substitute for the obsolete AT27C2048-90JC. Both devices share identical electrical specifications, memory architecture, and physical packaging, ensuring pin-for-pin compatibility and functional equivalence in circuit applications.

The AT27C2048-90JU offers extended advantages: active product status ensures ongoing availability and manufacturing support, ROHS3 compliance satisfies modern regulatory requirements, and an expanded operating temperature range (-40°C to 85°C) provides broader environmental tolerance compared to the original part's 0°C to 70°C specification.

Selection between these parts should be based on application requirements for regulatory compliance and environmental operating conditions. For new designs or production transitions, the AT27C2048-90JU is the appropriate choice due to its active status and compliance certifications.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts are electrically and mechanically identical across all critical parameters: 2Mbit capacity, 90 ns access time, 4.5V to 5.5V supply voltage, and 44-PLCC package. No circuit redesign is required for substitution.

Q: What is the significance of the different operating temperature ranges?

A: The AT27C2048-90JC operates from 0°C to 70°C, while the AT27C2048-90JU operates from -40°C to 85°C. The substitute part's extended range accommodates wider environmental conditions. If your application operates within 0°C to 70°C, both parts are functionally equivalent for temperature performance.

Q: Why is the AT27C2048-90JC listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The AT27C2048-90JU remains in active production, making it the recommended choice for ongoing supply chain requirements.

Q: Does RoHS compliance affect electrical performance?

A: RoHS compliance relates to material composition and environmental regulations, not electrical function. Both parts deliver identical electrical performance. The AT27C2048-90JU's ROHS3 compliance is advantageous for applications subject to regulatory requirements or customer specifications mandating RoHS-compliant components.

Q: Are there packaging differences between these parts?

A: Both parts use the 44-PLCC package with identical 16.6x16.6 mm footprint. The AT27C2048-90JC is supplied in standard packaging, while the AT27C2048-90JU is supplied in tube packaging. PCB footprint and mounting requirements are identical.