AT27C020-55PC Equivalent & Substitute Parts

Part Overview

The AT27C020-55PC is a 2Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 32-DIP package with 55 ns access time. This part is classified as obsolete, making identification of suitable substitutes essential for ongoing system support and component procurement. The AT27C020 series represents OTP (One-Time Programmable) EPROM technology designed for applications requiring non-volatile memory storage with parallel interface architecture.

Substiute Parts

AT27C020-55PC

Microchip TechnologyIn Stock: 4649AT27C020-55PC Datasheet

Current PartRFQ

AT27C020-55PU

Microchip TechnologyIn Stock: 7366AT27C020-55PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT27C020-55PC is determined by strict equivalence across the following critical parameters:

• Memory Capacity & Organization: 2Mbit capacity with 256K x 8 organization is mandatory for address and data bus compatibility
• Memory Interface Type: Parallel interface architecture must match the original design
• Access Time: 55 ns timing specification ensures performance compatibility with system timing requirements
• Supply Voltage Range: 4.5V ~ 5.5V compatibility maintains electrical compatibility with host systems
• Package & Pinout: 32-DIP package with identical pinout is required for direct socket compatibility
• Manufacturer: Microchip Technology AT27C020 base product number ensures pin-for-pin compatibility

The AT27C020-55PU qualifies as a direct substitute based on identical electrical specifications and package configuration. Differences in product status and operating temperature range do not affect functional substitution capability within the specified electrical parameters.

Parameter Comparison

Engineering Selection Recommendations

The AT27C020-55PU is a direct functional substitute for the AT27C020-55PC. Both parts share identical electrical specifications, memory capacity, access time, and package configuration, enabling socket-level replacement without circuit modification.

Selection between these parts should be based on:

• Product Availability: The AT27C020-55PU maintains active manufacturing status with higher inventory availability (7332 Pcs vs. 4624 Pcs), providing superior long-term supply chain reliability
• Regulatory Compliance: The AT27C020-55PU meets ROHS3 compliance requirements, whereas the AT27C020-55PC is RoHS non-compliant. Systems requiring RoHS compliance must use the AT27C020-55PU
• Operating Temperature Range: The AT27C020-55PU supports -40°C ~ 85°C operation compared to 0°C ~ 70°C for the AT27C020-55PC. Applications requiring extended temperature operation must use the AT27C020-55PU
• Packaging Format: The AT27C020-55PU is supplied in Tube packaging, whereas the AT27C020-55PC packaging format is unspecified

Frequently Asked Questions (FAQ)

Q: Can AT27C020-55PU replace AT27C020-55PC in existing designs?

A: Yes. Both parts are pin-for-pin compatible with identical electrical specifications, memory capacity, access time, and 32-DIP package configuration. Direct socket substitution is possible without circuit modification.

Q: What are the key differences between these parts?

A: The primary differences are product status (obsolete vs. active), operating temperature range (0°C ~ 70°C vs. -40°C ~ 85°C), RoHS compliance status (non-compliant vs. ROHS3 compliant), and packaging format (unspecified vs. Tube). Electrical performance and memory specifications are identical.

Q: Does the extended operating temperature range of AT27C020-55PU affect compatibility?

A: No. The extended temperature range of the AT27C020-55PU (-40°C ~ 85°C) is a superset of the AT27C020-55PC range (0°C ~ 70°C). The part functions correctly within the original operating range and provides additional capability for wider temperature applications.

Q: Is RoHS compliance a factor in substitution?

A: RoHS compliance becomes a selection factor only if your application or regulatory requirements mandate it. The AT27C020-55PU meets ROHS3 compliance, while the AT27C020-55PC does not. For RoHS-compliant systems, the AT27C020-55PU is required.

Q: Are there any packaging considerations?

A: The AT27C020-55PU is supplied in Tube packaging format. Both parts use identical 32-DIP (0.600", 15.24mm) package geometry suitable for through-hole mounting. Packaging format does not affect electrical compatibility or board-level integration.

Q: What is the memory organization of these parts?

A: Both parts feature 256K x 8 memory organization, providing 2Mbit total capacity. This organization supports 18-bit addressing (A0-A17) and 8-bit data bus (D0-D7) architecture.

Q: Can these parts be used interchangeably in production?

A: Yes, within the constraints of your system requirements. The AT27C020-55PU is preferred for new designs and ongoing production due to active manufacturing status and RoHS3 compliance. The AT27C020-55PC should be reserved for legacy system support only.