AT27C040-15PC Equivalent & Substitute Parts

Part Overview

The AT27C040-15PC is a 4Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 32-DIP package. This part is classified as obsolete and operates with a 150 ns access time across a 0°C to 70°C temperature range. Due to its obsolete status and limited operating temperature range, identifying compatible substitute parts is essential for system redesign, long-term availability, and compliance with current manufacturing standards.

Substiute Parts

AT27C040-15PC

Microchip TechnologyIn Stock: 799AT27C040-15PC Datasheet

Current PartRFQ

AT27C040-90PU

Microchip TechnologyIn Stock: 1681AT27C040-90PU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT27C040-15PC is determined by the following critical parameters:

• Memory Capacity & Organization: Must be 4Mbit with 512K x 8 organization
• Memory Type & Format: Must be EPROM with parallel interface
• Package & Mounting: Must use 32-DIP (0.600", 15.24mm) through-hole package
• Voltage Supply: Must operate within 4.5V ~ 5.5V range
• Access Time: Substitute must meet or exceed performance (equal or faster access time)

The AT27C040-90PU qualifies as a direct substitute because it maintains identical memory capacity, organization, format, interface, package, and voltage specifications while offering improved access time performance and extended operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

The AT27C040-90PU is the qualified substitute for AT27C040-15PC based on the following factors:

• Functional Compatibility: Identical memory capacity, organization, and parallel interface ensure direct functional replacement
• Package Compatibility: Both parts use 32-DIP through-hole packaging with identical physical dimensions
• Electrical Compatibility: Both operate within the same 4.5V ~ 5.5V supply voltage range
• Performance Enhancement: The AT27C040-90PU provides faster access time (90 ns vs. 150 ns), which is backward-compatible with systems designed for the slower part
• Product Status: The substitute is active and in production, ensuring long-term availability
• Compliance: The AT27C040-90PU meets ROHS3 compliance and is verified as programmable, addressing obsolescence and regulatory concerns

Frequently Asked Questions (FAQ)

Q: Can AT27C040-90PU directly replace AT27C040-15PC in existing designs?

A: Yes. Both parts share identical memory capacity (4Mbit), organization (512K x 8), parallel interface, 32-DIP package, and voltage supply range (4.5V ~ 5.5V). The faster access time of the substitute (90 ns) is compatible with systems designed for 150 ns operation.

Q: What is the difference in access time between these parts?

A: The AT27C040-15PC has 150 ns access time, while the AT27C040-90PU has 90 ns access time. The substitute is faster and will not cause timing issues in circuits designed for the original part.

Q: Are the operating temperature ranges compatible?

A: The AT27C040-15PC operates from 0°C to 70°C, while the AT27C040-90PU operates from -40°C to 85°C. The substitute has an extended temperature range, making it suitable for a wider range of applications.

Q: Is the AT27C040-90PU RoHS compliant?

A: Yes, the AT27C040-90PU is ROHS3 compliant. The original AT27C040-15PC is RoHS non-compliant, making the substitute preferable for applications requiring regulatory compliance.

Q: Are there any package or pinout differences?

A: No. Both parts use identical 32-DIP (0.600", 15.24mm) through-hole packages with the same pinout and mounting requirements.

Q: Why is the AT27C040-15PC listed as obsolete?

A: The AT27C040-15PC is obsolete due to its age and limited market demand. The AT27C040-90PU remains in active production and is the recommended alternative for new designs and replacements.