AT27C010-55JI Equivalent & Substitute Parts

Part Overview

The AT27C010-55JI is a 1Mbit EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 32-PLCC surface mount package. This part operates with a 55 ns access time and is designed for parallel memory interface applications requiring non-volatile storage. The AT27C010-55JI is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, maintenance, and component procurement.

Substiute Parts

AT27C010-55JI

Microchip TechnologyIn Stock: 7802AT27C010-55JI Datasheet

Current PartRFQ

AT27C010-70JU

Microchip TechnologyIn Stock: 2331AT27C010-70JU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT27C010-55JI is determined by strict equivalence across the following critical parameters:

Core Compatibility Criteria:

• Memory Type: Non-Volatile EPROM
• Memory Size: 1Mbit
• Memory Organization: 128K x 8
• Memory Interface: Parallel
• Package / Case: 32-LCC (J-Lead) / 32-PLCC (13.97x11.43)
• Voltage Supply: 4.5V ~ 5.5V
• Operating Temperature: -40°C ~ 85°C (TC)
• Mounting Type: Surface Mount

Access Time Consideration: The AT27C010-55JI operates at 55 ns access time. Substitute parts may have equal or faster (lower) access times, as faster components are backward compatible in timing-critical applications. Slower access times are not acceptable substitutes.

The identified substitute is AT27C010-70JU, which maintains all core compatibility parameters while operating at 70 ns access time. This part is classified as Active and RoHS3 Compliant, addressing the obsolescence and compliance limitations of the original part.

Parameter Comparison

Engineering Selection Recommendations

The AT27C010-70JU is the direct substitute for the AT27C010-55JI based on the following engineering criteria:

Product Status: The AT27C010-55JI is obsolete, while AT27C010-70JU is Active. Active status ensures ongoing availability and manufacturing support.

Compliance: AT27C010-70JU is RoHS3 Compliant, addressing regulatory requirements that may apply to new designs or system updates. The original part is RoHS non-compliant.

Functional Equivalence: Both parts share identical memory capacity (1Mbit), organization (128K x 8), interface type (Parallel), electrical specifications (4.5V ~ 5.5V supply, -40°C ~ 85°C operating range), and physical packaging (32-PLCC, 13.97x11.43 mm).

Access Time: The AT27C010-70JU operates at 70 ns compared to the original 55 ns. This 15 ns difference is acceptable in applications where the system timing budget accommodates the slower access time. For timing-critical applications, this parameter must be evaluated against system requirements.

Frequently Asked Questions (FAQ)

Q: Can AT27C010-70JU directly replace AT27C010-55JI in existing designs?

A: Yes, provided the system timing budget accommodates the 70 ns access time of the substitute. The 15 ns increase in access time is the only functional difference. All other electrical, mechanical, and interface parameters are identical.

Q: Are the physical packages identical?

A: Yes. Both parts use the 32-PLCC package with dimensions 13.97 x 11.43 mm and 32-LCC (J-Lead) case style. PCB footprints and mounting procedures are identical.

Q: What is the significance of the RoHS compliance difference?

A: AT27C010-70JU is RoHS3 Compliant, meaning it meets current environmental and hazardous substance restrictions. The original AT27C010-55JI is RoHS non-compliant. For new designs or systems subject to RoHS regulations, AT27C010-70JU is the appropriate choice.

Q: Are the voltage and temperature specifications the same?

A: Yes. Both parts operate at 4.5V to 5.5V supply voltage and function across the -40°C to 85°C temperature range. Electrical operating conditions are fully compatible.

Q: What does the MSL rating mean for these parts?

A: Both parts have MSL 2 (1 Year) rating, indicating they require controlled moisture exposure during storage and handling. Storage conditions and shelf life are identical between the two parts.

Q: Why is the substitute part listed as Active while the original is Obsolete?

A: Microchip Technology has discontinued the AT27C010-55JI but continues manufacturing AT27C010-70JU. Active status ensures component availability for procurement and ongoing system support.