AT27C2048-55VC Equivalent & Substitute Parts

Part Overview

The AT27C2048-55VC is a 2Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology, housed in a 40-VSOP package. This device operates with a 55 ns access time and supports a 4.5V to 5.5V supply voltage range across a 0°C to 70°C operating temperature window. The product is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Organization	128K x 16
Memory Format	EPROM
Memory Interface	Parallel
Access Time	55 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package Type	40-VSOP
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the AT27C2048-55VC is determined by the following core parameters:

Memory Capacity & Organization: Substitute parts must provide 2Mbit capacity with 128K x 16 organization to maintain functional equivalence
Memory Technology: EPROM - OTP (One-Time Programmable) technology is required
Access Time: 55 ns access time establishes the performance baseline
Supply Voltage: 4.5V ~ 5.5V compatibility ensures electrical interchangeability
Memory Interface: Parallel interface is mandatory for pin-level compatibility
Mounting Type: Surface mount technology is required

The AT27C2048-55JU qualifies as a substitute based on matching all core electrical and functional parameters. While the package differs (44-PLCC versus 40-VSOP), both are surface-mount configurations supporting the same memory capacity, organization, access time, and voltage specifications.

Parameter Comparison

Parameter	AT27C2048-55VC (Main)	AT27C2048-55JU (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Memory Size	2Mbit	2Mbit
Memory Organization	128K x 16	128K x 16
Memory Format	EPROM	EPROM
Technology	EPROM - OTP	EPROM - OTP
Memory Interface	Parallel	Parallel
Access Time	55 ns	55 ns
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Mounting Type	Surface Mount	Surface Mount
Package / Case	40-TFSOP (40-VSOP)	44-LCC (44-PLCC)
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	2 (1 Year)

Engineering Selection Recommendations

The AT27C2048-55JU is the qualified substitute for the AT27C2048-55VC based on the following factors:

Functional Equivalence: Both devices share identical memory capacity (2Mbit), organization (128K x 16), access time (55 ns), and supply voltage specifications (4.5V ~ 5.5V). The parallel interface and EPROM-OTP technology are matched across both parts.

Product Status: The AT27C2048-55JU maintains active product status with verified programmability, whereas the main part is obsolete. This ensures ongoing availability and manufacturer support.

Compliance & Certifications: The substitute part achieves ROHS3 compliance and carries a lower MSL rating (2 versus 3), indicating superior moisture handling characteristics and environmental compliance.

Temperature Operating Range: The AT27C2048-55JU supports an extended operating temperature range (-40°C ~ 85°C) compared to the main part (0°C ~ 70°C). This provides broader operational capability for temperature-sensitive applications.

Package Consideration: Substitution requires PCB layout modification due to package differences (40-VSOP to 44-PLCC). Pin mapping and footprint redesign are necessary for implementation.

Frequently Asked Questions (FAQ)

Q: Can the AT27C2048-55JU directly replace the AT27C2048-55VC without PCB modification?

A: No. While both devices are electrically equivalent, the package types differ (40-VSOP versus 44-PLCC). PCB layout and footprint redesign are required. Pin mapping must be verified against the respective datasheets to ensure correct signal routing.

Q: Are the memory specifications identical between these parts?

A: Yes. Both devices provide 2Mbit capacity with 128K x 16 organization, 55 ns access time, and parallel interface configuration. Memory functionality and electrical performance are equivalent.

Q: What is the significance of the extended temperature range in the substitute part?

A: The AT27C2048-55JU operates from -40°C to 85°C, compared to 0°C to 70°C for the main part. This extended range accommodates applications requiring operation in wider temperature environments. Verify your application's temperature requirements before selection.

Q: Does the RoHS3 compliance of the substitute part affect compatibility?

A: RoHS3 compliance indicates the substitute part meets current environmental and material restrictions. This does not affect electrical or functional compatibility but may be required for certain regulatory or procurement standards.

Q: What does the MSL rating difference mean for handling and storage?

A: The AT27C2048-55JU carries MSL 2 (1 Year shelf life) versus MSL 3 (168 Hours) for the main part. Lower MSL ratings indicate better moisture resistance and longer allowable storage periods before soldering, reducing risk of moisture-induced failures.

Q: Are both parts from the same manufacturer?

A: Yes. Both the AT27C2048-55VC and AT27C2048-55JU are manufactured by Microchip Technology, ensuring consistent design and quality standards.

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