AT49BV642D-70TU-T Equivalent & Substitute Parts

Part Overview

The AT49BV642D-70TU-T is a 64Mbit parallel FLASH memory IC manufactured by Microchip Technology, packaged in 48-TFSOP with 70 ns access time and 2.7V to 3.6V supply voltage range. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain identical memory capacity, organization, interface type, and physical packaging while offering active product status and improved availability.

Key Parameters

Parameter	Value
Memory Size	64Mbit
Memory Organization	4M x 16
Memory Interface	Parallel
Access Time	70 ns
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	48-TFSOP (0.724", 18.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the AT49BV642D-70TU-T is determined by the following critical parameters:

Memory Capacity & Organization: All substitutes maintain 64Mbit capacity with 4M x 16 organization
Memory Interface: Parallel interface required for pin-level compatibility
Package Type: 48-TFSOP package mandatory for PCB footprint compatibility
Supply Voltage: 2.7V ~ 3.6V range maintained across all substitutes
Operating Temperature: -40°C ~ 85°C range maintained
Access Time: Substitutes available at 70 ns (direct replacement) or 90 ns (acceptable for timing-relaxed applications)
Compliance: ROHS3 compliance and REACH unaffected status maintained

Substitute parts are grouped into two access time categories: 70 ns parts (SST38VF6401BT-70I/TV, SST38VF6402BT-70I/TV, SST38VF6403BT-70I/TV, SST38VF6404BT-70I/TV, SST39VF6401B-70-4I-EKE-T, SST39VF6402B-70-4I-EKE) and 90 ns parts (SST38VF6401-90-5I-EKE, SST38VF6402-90-5I-EKE, SST38VF6403-90-5I-EKE, SST38VF6404-90-5I-EKE). The 70 ns variants provide direct timing compatibility, while 90 ns variants are suitable for applications with relaxed timing requirements.

Parameter Comparison

Part Number	Manufacturer	Series	Memory Size	Memory Organization	Access Time	Write Cycle Time	Voltage Supply	Operating Temp	Package	Product Status	Packaging Type	Inventory
AT49BV642D-70TU-T	Microchip Technology	—	64Mbit	4M x 16	70 ns	120µs	2.7V ~ 3.6V	-40°C ~ 85°C	48-TFSOP	Obsolete	—	775 Pcs
SST38VF6401-90-5I-EKE	Microchip Technology	SST38	64Mbit	4M x 16	90 ns	10µs	2.7V ~ 3.6V	-40°C ~ 85°C	48-TFSOP	Active	Tray	2100 Pcs
SST38VF6401BT-70I/TV	Microchip Technology	SST38	64Mbit	4M x 16	70 ns	10µs	2.7V ~ 3.6V	-40°C ~ 85°C	48-TFSOP	Active	Tape & Reel	767 Pcs
SST38VF6402-90-5I-EKE	Microchip Technology	SST38	64Mbit	4M x 16	90 ns	10µs	2.7V ~ 3.6V	-40°C ~ 85°C	48-TFSOP	Active	Tray	2300 Pcs
SST38VF6402BT-70I/TV	Microchip Technology	SST38	64Mbit	4M x 16	70 ns	10µs	2.7V ~ 3.6V	-40°C ~ 85°C	48-TFSOP	Active	Tape & Reel	879 Pcs
SST38VF6403-90-5I-EKE	Microchip Technology	SST38	64Mbit	4M x 16	90 ns	10µs	2.7V ~ 3.6V	-40°C ~ 85°C	48-TFSOP	Active	Tray	2330 Pcs
SST38VF6403BT-70I/TV	Microchip Technology	SST38	64Mbit	4M x 16	70 ns	10µs	2.7V ~ 3.6V	-40°C ~ 85°C	48-TFSOP	Active	Tape & Reel	1071 Pcs
SST38VF6404-90-5I-EKE	Microchip Technology	SST38	64Mbit	4M x 16	90 ns	10µs	2.7V ~ 3.6V	-40°C ~ 85°C	48-TFSOP	Active	Tray	2602 Pcs
SST38VF6404BT-70I/TV	Microchip Technology	SST38	64Mbit	4M x 16	70 ns	10µs	2.7V ~ 3.6V	-40°C ~ 85°C	48-TFSOP	Active	Tape & Reel	1060 Pcs
SST39VF6401B-70-4I-EKE-T	Microchip Technology	SST39 MPF™	64Mbit	4M x 16	70 ns	10µs	2.7V ~ 3.6V	-40°C ~ 85°C	48-TFSOP	Active	Tape & Reel	10133 Pcs
SST39VF6402B-70-4I-EKE	Microchip Technology	SST39 MPF™	64Mbit	4M x 16	70 ns	10µs	2.7V ~ 3.6V	-40°C ~ 85°C	48-TFSOP	Active	Tray	3300 Pcs

Engineering Selection Recommendations

All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original AT49BV642D-70TU-T. Selection between 70 ns and 90 ns access time variants depends on circuit timing requirements. The 70 ns variants (SST38VF6401BT-70I/TV, SST38VF6402BT-70I/TV, SST38VF6403BT-70I/TV, SST38VF6404BT-70I/TV, SST39VF6401B-70-4I-EKE-T, SST39VF6402B-70-4I-EKE) provide direct timing compatibility with the original part. The 90 ns variants (SST38VF6401-90-5I-EKE, SST38VF6402-90-5I-EKE, SST38VF6403-90-5I-EKE, SST38VF6404-90-5I-EKE) are suitable for applications where the relaxed access time does not impact system performance.

All substitute parts are classified as active products, ensuring long-term availability and manufacturing support. Packaging format selection between Tape & Reel and Tray depends on production volume and assembly process requirements. SST39VF6401B-70-4I-EKE-T and SST39VF6402B-70-4I-EKE offer the highest inventory levels, supporting immediate procurement needs.

Frequently Asked Questions (FAQ)

Q: Can 90 ns access time parts replace the 70 ns original part? A: 90 ns variants are functionally compatible if circuit timing margins accommodate the additional 20 ns delay. System-level timing analysis is required to confirm suitability.

Q: Are all substitute parts pin-compatible with AT49BV642D-70TU-T? A: Yes. All substitutes use the 48-TFSOP package with identical pinout, memory organization (4M x 16), and parallel interface, ensuring direct PCB footprint compatibility.

Q: What is the difference between Tape & Reel and Tray packaging? A: Tape & Reel packaging is optimized for automated pick-and-place assembly in high-volume production. Tray packaging is suitable for manual handling and lower-volume applications. Both formats contain identical components.

Q: Do all substitute parts meet the same compliance standards? A: Yes. All listed substitutes maintain ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the original part.

Q: Which substitute part offers the best availability? A: SST39VF6401B-70-4I-EKE-T provides the highest inventory level at 10,133 pieces, followed by SST39VF6402B-70-4I-EKE at 3,300 pieces.

Q: Are there performance differences between SST38 and SST39 series substitutes? A: Both series maintain identical electrical specifications for memory capacity, organization, access time, voltage range, and operating temperature. Selection between series depends on availability and packaging format preference.

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