AT49F002-90PI Equivalent & Substitute Parts

Part Overview

The AT49F002-90PI is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-DIP package with 90 ns access time. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations. The part operates across industrial temperature ranges (-40°C to 85°C) and requires a 4.5V to 5.5V supply voltage.

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	Parallel
Access Time	90 ns
Package / Case	32-DIP (0.600", 15.24mm)
Voltage - Supply	4.5V ~ 5.5V
Mounting Type	Through Hole
Operating Temperature	-40°C ~ 85°C (TC)

Substitute Part Grouping Explanation

Substitution eligibility for the AT49F002-90PI is determined by the following critical parameters:

Memory Capacity & Organization: Must be 2Mbit with 256K x 8 organization
Interface Type: Must support parallel interface architecture
Package Compatibility: Must use 32-DIP (0.600", 15.24mm) form factor for through-hole mounting
Voltage Specification: Must operate within 4.5V to 5.5V supply range
Access Time: Substitute must meet or exceed the 90 ns specification (lower values are acceptable)

The SST39SF020A-70-4C-PHE meets all substitution criteria, offering improved performance characteristics while maintaining full electrical and mechanical compatibility.

Parameter Comparison

Parameter	AT49F002-90PI	SST39SF020A-70-4C-PHE	Compatibility
Memory Size	2Mbit	2Mbit	Match
Memory Organization	256K x 8	256K x 8	Match
Memory Interface	Parallel	Parallel	Match
Access Time	90 ns	70 ns	Substitute exceeds specification
Write Cycle Time	50µs	20µs	Substitute exceeds specification
Package / Case	32-DIP (0.600", 15.24mm)	32-DIP (0.600", 15.24mm)	Match
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	Match
Mounting Type	Through Hole	Through Hole	Match
Product Status	Obsolete	Active	Substitute actively supported

Engineering Selection Recommendations

The SST39SF020A-70-4C-PHE is a direct functional equivalent to the AT49F002-90PI. Both devices share identical memory capacity, organization, interface type, and physical packaging. The substitute part offers superior performance with 70 ns access time and 20µs write cycle time, both improvements over the original specification.

The SST39SF020A-70-4C-PHE carries active product status with ROHS3 compliance, whereas the AT49F002-90PI is obsolete and RoHS non-compliant. For new designs and system refreshes, the SST39SF020A-70-4C-PHE provides long-term availability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can the SST39SF020A-70-4C-PHE directly replace the AT49F002-90PI in existing designs?

A: Yes. Both parts are pin-compatible 32-DIP packages with identical memory organization (256K x 8), parallel interface, and supply voltage requirements (4.5V to 5.5V). No circuit modifications are required.

Q: What are the performance differences between these parts?

A: The SST39SF020A-70-4C-PHE provides faster access time (70 ns versus 90 ns) and faster write cycle time (20µs versus 50µs). These improvements are backward-compatible with designs specified for the AT49F002-90PI.

Q: Are there temperature range considerations for substitution?

A: The AT49F002-90PI operates from -40°C to 85°C (TC), while the SST39SF020A-70-4C-PHE operates from 0°C to 70°C (TA). Applications requiring the full -40°C to 85°C range must verify the substitute part's suitability for the specific thermal environment.

Q: What is the packaging difference between these parts?

A: Both parts use identical 32-DIP (0.600", 15.24mm) through-hole packaging. No PCB layout modifications are necessary.

Q: Why is the AT49F002-90PI obsolete?

A: The AT49F002-90PI has reached end-of-life status. The SST39SF020A-70-4C-PHE remains in active production with ongoing manufacturer support and availability.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message