AT27C1024-70PI EPROM Equivalent & Substitute Parts

Part Overview

The AT27C1024-70PI is a 1Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 40-pin DIP package with 70 ns access time. This part is classified as obsolete, making substitute components necessary for new designs, repairs, or production continuity. The AT27C1024 series represents OTP (One-Time Programmable) EPROM technology with non-volatile memory storage suitable for embedded systems and legacy equipment requiring parallel memory interfaces.

Substiute Parts

AT27C1024-70PI

Microchip TechnologyIn Stock: 1495AT27C1024-70PI Datasheet

Current PartRFQ

AT27C1024-70PU

Microchip TechnologyIn Stock: 5401AT27C1024-70PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT27C1024-70PI is determined by strict equivalence across the following critical parameters:

• Memory Capacity & Organization: 1Mbit capacity with 64K x 16 organization
• Access Time: 70 ns maximum access time
• Electrical Interface: Parallel memory interface with 4.5V ~ 5.5V supply voltage
• Package Compatibility: 40-pin DIP form factor (0.600", 15.24mm)
• Operating Temperature Range: -40°C ~ 85°C
• Mounting Technology: Through-hole mounting

The AT27C1024-70PU qualifies as a direct substitute based on identical electrical specifications, memory organization, access time, and package configuration. The primary distinction is packaging format (tube vs. standard) and product status (active vs. obsolete).

Parameter Comparison

Engineering Selection Recommendations

The AT27C1024-70PU is the direct functional equivalent of the AT27C1024-70PI. Selection between these parts should be based on the following criteria:

AT27C1024-70PU is preferred when:

• Active product status is required for new production or long-term availability
• ROHS3 compliance is mandated by design specifications or regulatory requirements
• Tube packaging format is compatible with assembly processes

AT27C1024-70PI may be retained when:

• Existing inventory supports immediate requirements
• Legacy system repairs require exact original part matching
• RoHS compliance is not a design constraint

Both parts maintain identical electrical performance, memory organization, access timing, and physical form factor, ensuring direct pin-for-pin and functional compatibility in 40-pin DIP socket applications.

Frequently Asked Questions (FAQ)

Q: Can AT27C1024-70PU replace AT27C1024-70PI in existing designs? A: Yes. Both parts are electrically and mechanically identical with matching memory capacity (1Mbit), access time (70 ns), supply voltage (4.5V ~ 5.5V), operating temperature range (-40°C ~ 85°C), and 40-pin DIP package configuration. The substitute is pin-for-pin compatible.

Q: What is the difference between the two part numbers? A: The primary differences are product status (AT27C1024-70PU is active; AT27C1024-70PI is obsolete), RoHS compliance (AT27C1024-70PU is ROHS3 compliant; AT27C1024-70PI is non-compliant), and packaging format (tube vs. standard).

Q: Are there any performance differences between these parts? A: No. Both parts share identical memory specifications, access time (70 ns), voltage supply range (4.5V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). Functional performance is equivalent.

Q: Is the 40-pin DIP package the same for both parts? A: Yes. Both parts use the 40-DIP (0.600", 15.24mm) package with through-hole mounting, ensuring mechanical compatibility in existing PCB designs and sockets.

Q: Why is AT27C1024-70PI marked as obsolete? A: The AT27C1024-70PI has reached end-of-life status. The AT27C1024-70PU remains in active production and is the recommended substitute for new designs and ongoing production requirements.

Q: Does RoHS compliance affect electrical compatibility? A: No. RoHS compliance relates to material composition and environmental standards, not electrical function. Both parts operate identically within the specified voltage and temperature parameters.