AT49F040A-70PI Equivalent & Substitute Parts

Part Overview

The AT49F040A-70PI is a 4Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-DIP package with 70 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.

Substiute Parts

AT49F040A-70PI

Microchip TechnologyIn Stock: 2305AT49F040A-70PI Datasheet

Current PartRFQ

SST39SF040-70-4C-PHE

Microchip TechnologyIn Stock: 1951SST39SF040-70-4C-PHE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT49F040A-70PI is determined by strict equivalence across the following parameters:

• Memory capacity: 4Mbit (512K x 8 organization)
• Interface type: Parallel
• Access time: 70 ns maximum
• Supply voltage: 4.5V to 5.5V compatibility
• Package: 32-DIP through-hole form factor
• Memory technology: FLASH non-volatile

The SST39SF040-70-4C-PHE meets all electrical and mechanical substitution criteria for the AT49F040A-70PI. Both devices share identical memory capacity, organization, interface architecture, access time specification, voltage requirements, and physical packaging.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF040-70-4C-PHE is the qualified substitute for AT49F040A-70PI applications. Selection is based on the following factors:

• Electrical equivalence: Identical memory capacity, organization, interface type, access time, and supply voltage specifications
• Physical compatibility: Identical 32-DIP package and through-hole mounting configuration
• Product availability: SST39SF040-70-4C-PHE maintains active product status with verified programmability, whereas AT49F040A-70PI is obsolete
• Regulatory compliance: SST39SF040-70-4C-PHE is ROHS3 compliant, addressing modern environmental standards
• Performance advantage: SST39SF040-70-4C-PHE provides faster write cycle time (20µs versus 40µs)

Frequently Asked Questions (FAQ)

Q: Can SST39SF040-70-4C-PHE directly replace AT49F040A-70PI in existing designs?

A: Yes. Both devices share identical memory capacity (4Mbit), organization (512K x 8), parallel interface, 70 ns access time, 4.5V to 5.5V supply voltage, and 32-DIP through-hole package. Direct pin-for-pin substitution is supported.

Q: What is the difference in write cycle time between these parts?

A: AT49F040A-70PI specifies 40µs write cycle time, while SST39SF040-70-4C-PHE specifies 20µs. The substitute part offers improved write performance without affecting read access time or other electrical parameters.

Q: Are there temperature range differences between these devices?

A: Yes. AT49F040A-70PI operates from -40°C to 85°C (industrial range), while SST39SF040-70-4C-PHE operates from 0°C to 70°C (commercial range). Applications requiring extended low-temperature operation below 0°C must evaluate this specification.

Q: What is the packaging difference?

A: Both devices use identical 32-DIP (0.600", 15.24mm) through-hole packages. SST39SF040-70-4C-PHE is supplied in tube packaging, while AT49F040A-70PI packaging format is not specified in available data.

Q: Does RoHS compliance affect substitution decisions?

A: SST39SF040-70-4C-PHE is ROHS3 compliant, while AT49F040A-70PI is RoHS non-compliant. For applications subject to RoHS regulations or environmental standards, the substitute part provides regulatory alignment.