AT27C020-15PC Equivalent & Substitute Parts

Part Overview

The AT27C020-15PC is a 2Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 32-DIP package. This device features 150 ns access time and operates across a 4.5V to 5.5V supply voltage range with a 0°C to 70°C temperature specification. The part is classified as obsolete, indicating limited availability and the necessity to identify functionally equivalent alternatives for ongoing system support and new designs.

Substiute Parts

AT27C020-15PC

Microchip TechnologyIn Stock: 944AT27C020-15PC Datasheet

Current PartRFQ

AT27C020-90PU

Microchip TechnologyIn Stock: 1362AT27C020-90PU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT27C020-15PC is determined by strict equivalence across the following critical parameters:

• Memory capacity (2Mbit) and organization (256K x 8)
• Parallel interface architecture
• Supply voltage compatibility (4.5V ~ 5.5V)
• Package form factor (32-DIP, 0.600" pitch)
• Through-hole mounting compatibility

Access time is not a limiting factor for substitution; faster alternatives (lower ns values) are electrically compatible and backward-compatible with designs specified for 150 ns operation. Operating temperature range may differ between alternatives; selection depends on the target application environment.

Parameter Comparison

Engineering Selection Recommendations

The AT27C020-90PU serves as the primary substitute for the AT27C020-15PC. Both devices share identical memory capacity, organization, interface type, supply voltage, and physical package specifications, ensuring direct functional compatibility.

The AT27C020-90PU offers superior performance characteristics: 90 ns access time (faster than the 150 ns specification of the original part) and an extended operating temperature range of -40°C to 85°C compared to 0°C to 70°C. The substitute part maintains active product status with Microchip Technology, ensuring ongoing availability and supply chain reliability.

The AT27C020-90PU achieves ROHS3 compliance, whereas the AT27C020-15PC is non-compliant. For applications subject to RoHS regulations or environmental compliance requirements, the substitute part is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Can the AT27C020-90PU directly replace the AT27C020-15PC in existing designs?

A: Yes. Both parts share identical memory capacity (2Mbit), organization (256K x 8), parallel interface, supply voltage (4.5V ~ 5.5V), and 32-DIP package specifications. The 90 ns access time of the substitute is faster than the 150 ns specification of the original part, ensuring backward compatibility.

Q: What is the significance of the access time difference (150 ns vs. 90 ns)?

A: Access time defines the maximum delay from address input to valid data output. The AT27C020-90PU's 90 ns specification is superior to the AT27C020-15PC's 150 ns specification. Systems designed for 150 ns operation will function correctly with the faster 90 ns device without modification.

Q: Are there temperature range considerations for substitution?

A: The AT27C020-90PU operates across -40°C to 85°C, while the AT27C020-15PC operates across 0°C to 70°C. For applications requiring operation below 0°C or above 70°C, the substitute part provides extended capability. For standard industrial temperature ranges (0°C to 70°C), both parts are suitable.

Q: What is the packaging difference between the two parts?

A: Both parts use 32-DIP (0.600", 15.24mm) through-hole packages. The AT27C020-15PC is supplied in standard packaging, while the AT27C020-90PU is supplied in tube packaging. Both are compatible with identical PCB footprints and socket configurations.

Q: Why is RoHS compliance relevant for this substitution?

A: The AT27C020-90PU is ROHS3 compliant, while the AT27C020-15PC is non-compliant. For applications or markets requiring RoHS compliance, the substitute part satisfies regulatory requirements. For legacy systems without compliance mandates, both parts are functionally equivalent.