CAT28C64BL90 Equivalent & Substitute Parts

Part Overview

The CAT28C64BL90 is a 64Kbit parallel EEPROM memory IC manufactured by onsemi in a 28-PDIP package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The part operates with a 90 ns access time and 5ms write cycle time, suitable for legacy embedded systems and industrial applications requiring non-volatile parallel memory storage.

Substiute Parts

CAT28C64BL90

onsemiIn Stock: 846CAT28C64BL90 Datasheet

Current PartRFQ

AT28C64B-15PU

Microchip TechnologyIn Stock: 3411AT28C64B-15PU Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CAT28C64BL90 is determined by the following critical parameters:

• Memory capacity: 64Kbit with 8K x 8 organization
• Interface type: Parallel configuration
• Package compatibility: 28-DIP form factor with 0.600" (15.24mm) pitch
• Voltage specification: 4.5V to 5.5V supply range
• Non-volatile EEPROM technology

The AT28C64B-15PU qualifies as a substitute based on matching memory capacity, organization, parallel interface, package type, and supply voltage specifications. Differences in access time (150 ns vs. 90 ns) and write cycle time (10ms vs. 5ms) represent performance trade-offs acceptable in substitution scenarios where the slower device meets system timing requirements.

Parameter Comparison

Engineering Selection Recommendations

The AT28C64B-15PU is an active product from Microchip Technology and serves as the primary substitute for the obsolete CAT28C64BL90. Both devices share identical memory capacity, organization, parallel interface architecture, and supply voltage specifications, enabling direct functional replacement in 28-DIP through-hole applications.

The AT28C64B-15PU provides extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), RoHS3 compliance status, and verified programmability through DiGi-Electronics. The slower access time (150 ns) and extended write cycle time (10ms) must be evaluated against system timing constraints to confirm compatibility in the target application.

Frequently Asked Questions (FAQ)

Q: Can the AT28C64B-15PU directly replace the CAT28C64BL90 in existing designs?

A: Direct replacement is possible when system timing requirements accommodate the AT28C64B-15PU's 150 ns access time and 10ms write cycle time. The identical 28-DIP package, memory organization, and supply voltage enable pin-for-pin substitution. Verify that the slower performance parameters do not violate application timing specifications.

Q: What are the key differences between these two parts?

A: The primary differences are access time (90 ns vs. 150 ns), write cycle time (5ms vs. 10ms), operating temperature range (0°C–70°C vs. -40°C–85°C), and product status (obsolete vs. active). Both devices are functionally equivalent 64Kbit parallel EEPROMs in 28-DIP packages.

Q: Is the AT28C64B-15PU suitable for industrial temperature applications?

A: The AT28C64B-15PU supports -40°C to 85°C operation, making it suitable for extended industrial temperature ranges. The CAT28C64BL90 is limited to 0°C to 70°C, so the substitute provides broader temperature coverage.

Q: Are there any compliance or certification differences?

A: The AT28C64B-15PU carries RoHS3 compliance and verified DiGi-Electronics programmability status. Both parts are REACH unaffected and classified under ECCN EAR99 and HTSUS 8542.32.0051.