AT49F002T-70PC Equivalent & Substitute Parts

Part Overview

The AT49F002T-70PC is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-PDIP package with 70 ns access time. This device is classified as obsolete and is no longer in active production. Finding equivalent substitute parts is necessary due to discontinued status and limited remaining inventory. The SST39SF020A-70-4C-PHE serves as a direct functional equivalent with active product status and improved electrical characteristics.

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	Parallel
Access Time	70 ns
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	32-DIP (0.600", 15.24mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the AT49F002T-70PC is determined by the following critical parameters:

Memory capacity: 2Mbit (256K x 8 organization)
Interface type: Parallel
Access time: 70 ns maximum
Supply voltage range: 4.5V ~ 5.5V
Package: 32-DIP form factor with 0.600" width
Mounting: Through-hole technology

The SST39SF020A-70-4C-PHE meets all substitution criteria. Both devices share identical memory specifications, electrical operating ranges, and physical packaging. The substitute part maintains full pin and functional compatibility while offering improved write cycle performance and active product status.

Parameter Comparison

Parameter	AT49F002T-70PC	SST39SF020A-70-4C-PHE
Manufacturer	Microchip Technology	Microchip Technology
Memory Size	2Mbit	2Mbit
Memory Organization	256K x 8	256K x 8
Memory Interface	Parallel	Parallel
Access Time	70 ns	70 ns
Write Cycle Time	50µs	20µs
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Package / Case	32-DIP (0.600", 15.24mm)	32-DIP (0.600", 15.24mm)
Mounting Type	Through Hole	Through Hole
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The SST39SF020A-70-4C-PHE is the qualified substitute for AT49F002T-70PC applications. Selection is based on:

Identical memory capacity and organization ensure functional equivalence
Matching access time and voltage specifications guarantee electrical compatibility
Identical 32-DIP package enables direct socket replacement
Active product status ensures long-term availability and supply chain continuity
ROHS3 compliance of the substitute part meets modern regulatory requirements, whereas the original part carries RoHS non-compliant status
Improved write cycle time (20µs vs. 50µs) provides performance enhancement without compromising compatibility

Frequently Asked Questions (FAQ)

Q: Can SST39SF020A-70-4C-PHE replace AT49F002T-70PC in existing designs?

A: Yes. Both devices share identical memory capacity (2Mbit, 256K x 8), access time (70 ns), supply voltage (4.5V ~ 5.5V), operating temperature range (0°C ~ 70°C), and 32-DIP package footprint. Pin-for-pin compatibility is maintained.

Q: What is the primary difference between these parts?

A: The substitute part features improved write cycle time (20µs versus 50µs) and holds active product status with ROHS3 compliance, whereas the original is obsolete and RoHS non-compliant.

Q: Are there any package or mounting differences?

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

Q: Does the faster write cycle time of the substitute affect compatibility?

A: No. Faster write performance is a beneficial characteristic that does not create compatibility issues. Systems designed for the original 50µs write cycle will function correctly with the improved 20µs specification.

Q: What certifications apply to the substitute part?

A: The SST39SF020A-70-4C-PHE is ROHS3 compliant and REACH unaffected. The original AT49F002T-70PC is RoHS non-compliant.

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