BQ4015MA-85 NVSRAM 4Mbit Parallel Memory IC Equivalent & Substitute Parts

Part Overview

The BQ4015MA-85 is a Non-Volatile SRAM (NVSRAM) memory IC manufactured by Texas Instruments, providing 4Mbit storage capacity in a 512K x 8 organization with parallel interface architecture. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing system support and new designs. The BQ4015MA-85 operates at 85 ns access time with supply voltage range of 4.75V to 5.5V and is housed in a 32-DIP module package rated for 0°C to 70°C operating temperature.

Key Parameters

Parameter	BQ4015MA-85 Specification
Memory Type	Non-Volatile SRAM (NVSRAM)
Memory Size	4Mbit
Memory Organization	512K x 8
Memory Interface	Parallel
Access Time	85 ns
Write Cycle Time	85 ns
Supply Voltage	4.75V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	32-DIP Module (18.42x42.8mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BQ4015MA-85 is determined by strict adherence to the following electrical and mechanical parameters:

Core Compatibility Requirements:

Memory Type: Non-Volatile SRAM (NVSRAM)
Memory Size: 4Mbit
Memory Organization: 512K x 8
Memory Interface: Parallel
Mounting Type: Through Hole
Package Category: 32-DIP Module

Performance Flexibility:

Access Time: Equal to or faster than 85 ns (70 ns or 100 ns variants acceptable)
Write Cycle Time: Equal to or faster than 85 ns (70 ns or 100 ns variants acceptable)
Supply Voltage: Must encompass or be compatible with 4.75V ~ 5.5V range
Operating Temperature: Must support minimum 0°C ~ 70°C range

All substitute parts listed are manufactured by Analog Devices Inc./Maxim Integrated and maintain ROHS3 compliance and MSL 1 rating. Substitute parts are available in active product status with confirmed inventory.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Organization	Access Time (ns)	Write Cycle (ns)	Supply Voltage	Temp Range (°C)	Package	Status
BQ4015MA-85	Texas Instruments	4Mbit	512K x 8	85	85	4.75V ~ 5.5V	0 ~ 70	32-DIP Module	Obsolete
DS1250AB-70+	Analog Devices/Maxim	4Mbit	512K x 8	70	70	4.75V ~ 5.25V	0 ~ 70	32-EDIP	Active
DS1250AB-70IND+	Analog Devices/Maxim	4Mbit	512K x 8	70	70	4.75V ~ 5.25V	-40 ~ 85	32-EDIP	Active
DS1250Y-100+	Analog Devices/Maxim	4Mbit	512K x 8	100	100	4.5V ~ 5.5V	0 ~ 70	32-EDIP	Active
DS1250Y-100IND+	Analog Devices/Maxim	4Mbit	512K x 8	100	100	4.5V ~ 5.5V	-40 ~ 85	32-EDIP	Active
DS1250Y-70+	Analog Devices/Maxim	4Mbit	512K x 8	70	70	4.5V ~ 5.5V	0 ~ 70	32-EDIP	Active
DS1250Y-70IND+	Analog Devices/Maxim	4Mbit	512K x 8	70	70	4.5V ~ 5.5V	-40 ~ 85	32-EDIP	Active

Engineering Selection Recommendations

For Direct Replacement (0°C ~ 70°C Operating Range):

DS1250Y-70+ provides the closest electrical and thermal performance match to the BQ4015MA-85. This part delivers 70 ns access time (faster than the original 85 ns specification), maintains the required 4.5V ~ 5.5V supply voltage compatibility, and operates within the identical 0°C to 70°C temperature range. The part is in active production status with ROHS3 compliance and unlimited moisture sensitivity rating.

For Extended Temperature Applications (-40°C ~ 85°C Operating Range):

DS1250Y-70IND+ extends the operating temperature range to -40°C ~ 85°C while maintaining 70 ns access time and 4.5V ~ 5.5V supply voltage specifications. This variant is suitable for industrial and harsh environment applications. Inventory availability is highest among all substitutes at 6,375 pieces.

For Relaxed Timing Requirements:

DS1250Y-100+ and DS1250Y-100IND+ provide 100 ns access time specifications, which remain compatible with the original 85 ns BQ4015MA-85 timing in applications where the slower performance is acceptable. These parts offer the widest supply voltage range (4.5V ~ 5.5V) and are available in both commercial (0°C ~ 70°C) and industrial (-40°C ~ 85°C) temperature grades.

For Constrained Supply Voltage (4.75V ~ 5.25V):

DS1250AB-70+ and DS1250AB-70IND+ operate within the narrower 4.75V ~ 5.25V supply voltage window, matching the original BQ4015MA-85 specification more precisely. These parts deliver 70 ns access time and are available in commercial and industrial temperature grades.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and through-hole mounting compatibility with the original 32-DIP module footprint.

Frequently Asked Questions (FAQ)

Q: Can DS1250Y-70+ directly replace BQ4015MA-85 in existing PCB designs?

A: Yes, for applications operating within 0°C to 70°C temperature range. The DS1250Y-70+ maintains identical 4Mbit capacity, 512K x 8 organization, parallel interface, and 32-DIP module package footprint. The 70 ns access time is faster than the original 85 ns specification, ensuring backward compatibility. Supply voltage range 4.5V ~ 5.5V encompasses the original 4.75V ~ 5.5V requirement.

Q: What is the difference between DS1250Y-70+ and DS1250Y-70IND+?

A: Both parts are electrically identical with 70 ns access time and 4.5V ~ 5.5V supply voltage. The primary difference is operating temperature range: DS1250Y-70+ operates 0°C ~ 70°C (commercial grade), while DS1250Y-70IND+ operates -40°C ~ 85°C (industrial grade). Select the industrial variant for applications requiring extended temperature performance.

Q: Why do some substitutes have 100 ns access time when the original is 85 ns?

A: The DS1250Y-100 series parts are functionally compatible substitutes because 100 ns access time is slower than the original 85 ns specification. In timing-critical applications, verify that the system design accommodates the additional 15 ns delay. For applications with timing margins, the 100 ns variants provide equivalent functionality.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts (DS1250AB and DS1250Y series) maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the original BQ4015MA-85 environmental specifications.

Q: What is the package difference between 32-DIP Module and 32-EDIP?

A: Both are 32-pin through-hole packages with compatible footprints for the 4Mbit NVSRAM function. The 32-EDIP (Enhanced DIP) variant used in the DS1250 series maintains mechanical and electrical compatibility with the original 32-DIP module package. Pin assignments and signal definitions remain identical.

Q: Which substitute part has the highest inventory availability?

A: DS1250Y-70IND+ has the highest confirmed inventory at 6,375 pieces, followed by DS1250Y-70+ at 1,415 pieces. Both parts deliver 70 ns access time performance and are in active production status.

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