AT27C020-15TC Equivalent & Substitute Parts

Part Overview

The AT27C020-15TC is a 2Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 32-TFSOP surface mount package. This device operates with a 150 ns access time and is designed for non-volatile memory applications requiring parallel interface connectivity. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Memory Type	Non-Volatile EPROM
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	Parallel
Access Time	150 ns
Supply Voltage	4.5V ~ 5.5V
Operating Temperature Range	0°C ~ 70°C
Mounting Type	Surface Mount
Package Type	32-TFSOP
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the AT27C020-15TC is determined by the following critical parameters:

Core Functional Requirements:

Memory capacity: 2Mbit (256K x 8 organization)
Memory technology: EPROM - OTP (One-Time Programmable)
Interface type: Parallel
Supply voltage: 4.5V ~ 5.5V compatibility
Manufacturer: Microchip Technology (AT27C020 base product family)

Acceptable Variation Parameters:

Access time: Faster access times (90 ns) are acceptable as they maintain backward compatibility
Operating temperature range: Extended ranges are acceptable
Package type: Different surface mount packages within the same family are acceptable if board layout permits
RoHS compliance: Improved compliance status is acceptable

The AT27C020-90JU qualifies as a substitute because it maintains identical memory capacity, organization, interface type, and supply voltage specifications while offering improved performance characteristics and compliance status.

Parameter Comparison

Parameter	AT27C020-15TC (Main Part)	AT27C020-90JU (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Memory Size	2Mbit	2Mbit
Memory Organization	256K x 8	256K x 8
Memory Format	EPROM	EPROM
Memory Interface	Parallel	Parallel
Access Time	150 ns	90 ns
Supply Voltage	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount
Package Type	32-TFSOP	32-PLCC (J-Lead)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The AT27C020-90JU is the qualified substitute for the AT27C020-15TC based on the following engineering criteria:

Functional Compatibility: Both devices share identical memory capacity (2Mbit), organization (256K x 8), interface type (Parallel), and supply voltage specifications (4.5V ~ 5.5V). The substitute operates at 90 ns access time, which is faster than the original 150 ns specification, ensuring backward compatibility with timing-critical applications.

Product Status: The AT27C020-90JU maintains active product status with verified programmability through DiGi-Electronics, whereas the original part is obsolete. This ensures long-term availability and supply chain continuity.

Compliance Improvement: The substitute achieves ROHS3 compliance, addressing regulatory requirements that may apply to new designs or system updates. The original part is RoHS non-compliant.

Temperature Range Extension: The substitute operates across -40°C to 85°C, providing a wider operating envelope than the original 0°C to 70°C range, suitable for extended environmental applications.

Package Consideration: The substitute uses a 32-PLCC (J-Lead) package instead of the original 32-TFSOP. Board-level integration requires verification of footprint compatibility and PCB layout accommodation.

Frequently Asked Questions (FAQ)

Q: Can the AT27C020-90JU directly replace the AT27C020-15TC without circuit modifications?

A: Functional replacement is supported due to identical memory specifications, parallel interface, and supply voltage compatibility. However, package geometry differs (32-PLCC versus 32-TFSOP), requiring PCB footprint verification and potential layout adjustments.

Q: What is the significance of the faster 90 ns access time in the substitute?

A: The 90 ns access time is faster than the original 150 ns specification. This represents improved performance and maintains backward compatibility with systems designed for the slower original part. No timing violations occur when substituting a faster device into a circuit designed for the slower original.

Q: Does the extended operating temperature range of the substitute affect compatibility?

A: The substitute's -40°C to 85°C range encompasses the original 0°C to 70°C specification. This extension provides additional operational margin and is fully compatible with applications designed for the original temperature range.

Q: Are there any programming or initialization differences between these parts?

A: Both devices use identical EPROM technology and parallel interface architecture. Programming procedures and initialization sequences remain consistent across the AT27C020 family.

Q: What is the impact of RoHS3 compliance on system integration?

A: ROHS3 compliance indicates the substitute meets current environmental and material restriction standards. This is advantageous for new designs, regulatory compliance, and long-term supply chain sustainability. Systems using the non-compliant original part may require compliance assessment for updated versions.

Q: How should package differences be evaluated for board redesign?

A: The 32-PLCC package has different pin pitch and footprint dimensions compared to the 32-TFSOP. PCB layout must be verified for physical clearance, trace routing, and mechanical assembly compatibility before implementation.

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