AT28C17E-20PC Equivalent & Substitute Parts

Part Overview

The AT28C17E-20PC is a 16Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 28-DIP package with 200 ns access time. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance, redesigns, and new production runs. The part operates within a 4.5V to 5.5V supply voltage range and supports through-hole mounting applications typical of legacy embedded systems and industrial equipment.

Substiute Parts

AT28C17E-20PC

Microchip TechnologyIn Stock: 930AT28C17E-20PC Datasheet

Current PartRFQ

AT28C64B-15PU

Microchip TechnologyIn Stock: 3411AT28C64B-15PU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT28C17E-20PC is determined by the following critical parameters:

Mandatory Compatibility Parameters:

• Memory Interface: Parallel (pin-compatible requirement)
• Package Type: 28-DIP form factor (physical and electrical pin compatibility)
• Voltage Supply Range: 4.5V ~ 5.5V (operational voltage compatibility)
• Mounting Type: Through Hole (PCB assembly compatibility)

Functional Compatibility Parameters:

• Memory Type: Non-Volatile EEPROM (functional equivalence)
• Memory Organization: Minimum 2K x 8 (address and data bus compatibility)

The AT28C64B-15PU qualifies as a substitute because it maintains identical package geometry, voltage specifications, mounting type, and parallel interface architecture. The substitute part exceeds the original specifications in memory capacity (64Kbit vs. 16Kbit) and access time performance (150 ns vs. 200 ns), ensuring functional compatibility with existing circuit designs while providing enhanced performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The AT28C64B-15PU is the primary substitute for the obsolete AT28C17E-20PC. Selection is justified on the following engineering criteria:

Product Status Alignment: The substitute part maintains active production status with verified programmability, ensuring long-term availability and supply chain continuity compared to the obsolete main part.

Compliance Improvement: The AT28C64B-15PU achieves ROHS3 compliance, addressing regulatory requirements for new designs and manufacturing environments where RoHS non-compliant components present procurement and environmental restrictions.

Electrical Compatibility: Both parts operate within identical voltage supply ranges (4.5V ~ 5.5V) and maintain the same parallel interface architecture, ensuring direct functional compatibility in existing circuit topologies without redesign.

Physical Compatibility: Identical 28-DIP package geometry and through-hole mounting specifications enable direct PCB footprint compatibility and assembly process alignment.

Performance Enhancement: The substitute part provides superior access time (150 ns vs. 200 ns) and extended operating temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C), supporting broader application environments and improved system performance margins.

Frequently Asked Questions (FAQ)

Q: Can the AT28C64B-15PU directly replace the AT28C17E-20PC without PCB modifications?

A: Yes. Both parts use identical 28-DIP package geometry with matching pin assignments for parallel EEPROM interface signals. Direct socket substitution is possible without PCB layout changes. Address line A13 and A14 on the substitute part remain unconnected in applications designed for 16Kbit memory, maintaining functional equivalence.

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

A: The primary differences are memory capacity (16Kbit vs. 64Kbit), access time (200 ns vs. 150 ns), write cycle time (200 µs vs. 10 ms), operating temperature range (0°C ~ 70°C vs. -40°C ~ 85°C), product status (obsolete vs. active), and RoHS compliance (non-compliant vs. ROHS3 compliant).

Q: Is the substitute part backward compatible with the original part?

A: Yes. The AT28C64B-15PU is functionally backward compatible. Applications designed for the AT28C17E-20PC will operate correctly with the substitute part. The higher memory capacity and faster access time do not create compatibility issues in existing designs.

Q: What is the impact of the different write cycle times?

A: The AT28C64B-15PU has a longer write cycle time (10 ms vs. 200 µs). This affects write operation duration but does not impact read operations or overall system compatibility. Applications must account for the extended write cycle time in timing-critical write sequences.

Q: Are there any temperature range considerations for substitution?

A: The substitute part supports an extended operating temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C). This provides greater flexibility for applications operating in extreme temperature environments. Existing designs operating within 0°C ~ 70°C will experience no adverse effects.

Q: Does RoHS compliance affect functional compatibility?

A: No. RoHS compliance is a manufacturing and environmental standard that does not affect electrical or functional compatibility. The ROHS3 compliance of the substitute part represents an improvement for regulatory alignment and supply chain management.