AT29C020-90JU Equivalent & Substitute Parts

Part Overview

The AT29C020-90JU is a 2Mbit parallel FLASH memory IC in 32-PLCC packaging manufactured by Microchip Technology. This device features a 90 ns access time and operates across the industrial temperature range of -40°C to 85°C. The part is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. Substitute parts must maintain identical memory capacity, organization, interface type, and package configuration while meeting current product availability and compliance requirements.

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	Parallel
Package / Case	32-LCC (J-Lead)
Supplier Device Package	32-PLCC
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Memory Type	Non-Volatile FLASH
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT29C020-90JU is determined by strict equivalence across the following parameters:

Memory capacity and organization (2Mbit, 256K x 8 configuration)
Memory interface type (Parallel)
Physical package format (32-PLCC with J-Lead configuration)
Supply voltage range (4.5V ~ 5.5V)
Operating temperature range (-40°C ~ 85°C)
Non-volatile FLASH technology
RoHS3 compliance

Access time and write cycle time are performance characteristics that may vary between substitutes. Faster access times (55 ns, 70 ns) are backward-compatible with the original 90 ns specification. The SST39SF020A series from Microchip Technology meets all mandatory equivalence criteria and is available in active production status.

Parameter Comparison

Parameter	AT29C020-90JU	SST39SF020A-55-4I-NHE	SST39SF020A-70-4I-NHE
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Memory Size	2Mbit	2Mbit	2Mbit
Memory Organization	256K x 8	256K x 8	256K x 8
Memory Interface	Parallel	Parallel	Parallel
Package / Case	32-LCC (J-Lead)	32-LCC (J-Lead)	32-LCC (J-Lead)
Supplier Device Package	32-PLCC (13.97x11.43)	32-PLCC (11.43x13.97)	32-PLCC (11.43x13.97)
Access Time	90 ns	55 ns	70 ns
Write Cycle Time	10ms	20µs	20µs
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TC)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	2 (1 Year)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Both SST39SF020A variants are suitable substitutes for the AT29C020-90JU based on functional equivalence and compliance status. The SST39SF020A-55-4I-NHE and SST39SF020A-70-4I-NHE are active production parts from Microchip Technology, ensuring long-term availability and supply chain continuity compared to the obsolete AT29C020-90JU.

The SST39SF020A-55-4I-NHE offers the fastest access time at 55 ns and maintains MSL 2 classification. The SST39SF020A-70-4I-NHE provides 70 ns access time with verified programmability status. Both parts maintain ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements.

Selection between the two SST39SF020A variants depends on access time requirements and moisture sensitivity handling procedures. The 55 ns variant provides performance margin, while the 70 ns variant remains compatible with the original 90 ns specification.

Frequently Asked Questions (FAQ)

Q: Can SST39SF020A parts directly replace AT29C020-90JU in existing designs?

A: Yes. Both SST39SF020A variants are pin-compatible and functionally equivalent. They maintain identical memory capacity (2Mbit), organization (256K x 8), parallel interface, 32-PLCC package configuration, and supply voltage range (4.5V ~ 5.5V). The faster access times (55 ns and 70 ns) are backward-compatible with the original 90 ns specification.

Q: What is the difference between SST39SF020A-55-4I-NHE and SST39SF020A-70-4I-NHE?

A: The primary differences are access time (55 ns versus 70 ns) and moisture sensitivity level (MSL 2 versus MSL 3). Both parts are functionally equivalent and support the same memory operations. The 55 ns variant provides faster read access, while the 70 ns variant maintains compatibility with the original timing specification.

Q: Are there package dimension differences between the main part and substitutes?

A: The AT29C020-90JU specifies 32-PLCC dimensions of 13.97x11.43mm, while both SST39SF020A variants specify 11.43x13.97mm. These represent the same 32-PLCC J-Lead package with dimensions listed in different order conventions. Physical footprint and pin configuration are identical.

Q: Do the substitute parts meet current compliance requirements?

A: Yes. Both SST39SF020A variants are ROHS3 compliant and REACH unaffected, meeting current regulatory standards. The AT29C020-90JU is also ROHS3 compliant, ensuring compliance continuity in substitution.

Q: What is the impact of faster write cycle time in substitute parts?

A: The SST39SF020A variants feature 20µs write cycle time compared to the AT29C020-90JU's 10ms specification. Faster write cycles improve programming performance and do not create compatibility issues. Existing firmware and application code will function correctly with the improved write performance.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message