AT28C64-15PI Equivalent & Substitute Parts

Part Overview

The AT28C64-15PI is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 28-DIP package with 150 ns access time. This part is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The AT28C64-15PI operates across the industrial temperature range of -40°C to 85°C and requires a 4.5V to 5.5V supply voltage.

Substiute Parts

AT28C64-15PI

Microchip TechnologyIn Stock: 1199AT28C64-15PI Datasheet

Current PartRFQ

AT28C64B-15PU

Microchip TechnologyIn Stock: 3411AT28C64B-15PU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT28C64-15PI is determined by strict equivalence across the following critical parameters:

• Memory capacity (64Kbit) and organization (8K x 8)
• Parallel interface architecture
• Access time specification (150 ns)
• Supply voltage range (4.5V ~ 5.5V)
• Operating temperature range (-40°C ~ 85°C)
• Physical package (28-DIP through-hole)
• Manufacturer compatibility (Microchip Technology AT28C64 series)

The AT28C64B-15PU qualifies as a direct substitute based on matching all critical electrical and mechanical parameters. The primary distinction is the product status transition from obsolete to active, along with improved compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The AT28C64B-15PU is the qualified substitute for the obsolete AT28C64-15PI. Both parts maintain identical electrical specifications for memory capacity, interface type, access time, supply voltage, and operating temperature range. The physical footprint and pinout are equivalent, enabling direct board-level replacement without layout modifications.

The AT28C64B-15PU offers improved product lifecycle status (active versus obsolete), ensuring long-term availability and supply chain continuity. The part achieves ROHS3 compliance, meeting current environmental and regulatory requirements. The extended write cycle time (10 ms versus 1 ms) does not impact functional compatibility in applications where write operations are not time-critical.

Frequently Asked Questions (FAQ)

Q: Can the AT28C64B-15PU replace the AT28C64-15PI in existing designs?

A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), parallel interface, access time (150 ns), supply voltage range (4.5V ~ 5.5V), operating temperature range (-40°C ~ 85°C), and 28-DIP package footprint. Direct substitution is electrically and mechanically compatible.

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

A: The AT28C64-15PI specifies 1 ms write cycle time, while the AT28C64B-15PU specifies 10 ms. This difference does not affect functional compatibility. Applications requiring faster write operations should evaluate timing requirements against the 10 ms specification.

Q: Are there packaging differences between these parts?

A: The AT28C64B-15PU is supplied in tube packaging, while the AT28C64-15PI packaging is not specified. Both use the same 28-DIP through-hole package for board mounting.

Q: What compliance certifications apply to the substitute part?

A: The AT28C64B-15PU is ROHS3 compliant and REACH unaffected. The original AT28C64-15PI is RoHS non-compliant. The substitute meets current environmental and regulatory standards.

Q: Is the AT28C64B-15PU currently available?

A: Yes. The AT28C64B-15PU is classified as active product status with documented inventory availability, whereas the AT28C64-15PI is obsolete.