BQ4015MA-70 NVSRAM 4Mbit Parallel Memory IC Equivalent & Substitute Parts

Part Overview

The BQ4015MA-70 is a Non-Volatile SRAM (NVSRAM) memory IC manufactured by Texas Instruments, providing 4Mbit storage capacity in a 512K x 8 organization with 70 ns access time. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The part operates within a 4.75V to 5.5V supply range and is rated for 0°C to 70°C operating temperature in a 32-DIP through-hole package configuration.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile SRAM (NVSRAM)
Memory Size	4Mbit
Memory Organization	512K x 8
Memory Interface	Parallel
Access Time	70 ns
Write Cycle Time	70 ns
Voltage Supply Range	4.75V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	32-DIP Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the BQ4015MA-70 is determined by strict alignment of the following electrical and mechanical parameters:

Memory capacity (4Mbit, 512K x 8 organization), parallel interface architecture, and access time specifications form the primary substitution criteria. The BQ4015MA-70 operates at 70 ns access time; direct substitutes must match this timing specification or provide faster performance (lower access time values are acceptable in systems with timing margins).

Supply voltage compatibility is critical. The BQ4015MA-70 requires 4.75V to 5.5V operation. Substitute parts must support this voltage window or provide a compatible overlapping range.

Package compatibility requires 32-DIP through-hole mounting with mechanical dimensions suitable for the original footprint (0.610" or 15.49mm pitch standard).

Operating temperature range defines application suitability. The BQ4015MA-70 is rated 0°C to 70°C. Substitutes with extended temperature ranges (-40°C to 85°C) are functionally compatible for standard temperature applications.

Product status and compliance certifications (RoHS3, REACH) ensure regulatory alignment for new designs and ongoing support.

Parameter Comparison

Parameter	BQ4015MA-70	DS1250Y-70IND+	DS1250AB-70+	DS1250AB-70IND+	DS1250Y-100+	DS1250Y-100IND+	DS1250Y-70+
Manufacturer	Texas Instruments	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Memory Type	NVSRAM	NVSRAM	NVSRAM	NVSRAM	NVSRAM	NVSRAM	NVSRAM
Memory Size	4Mbit	4Mbit	4Mbit	4Mbit	4Mbit	4Mbit	4Mbit
Memory Organization	512K x 8	512K x 8	512K x 8	512K x 8	512K x 8	512K x 8	512K x 8
Access Time	70 ns	70 ns	70 ns	70 ns	100 ns	100 ns	70 ns
Write Cycle Time	70 ns	70 ns	70 ns	70 ns	100 ns	100 ns	70 ns
Voltage Supply Range	4.75V ~ 5.5V	4.5V ~ 5.5V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C
Package / Case	32-DIP Module (0.610", 15.49mm)	32-EDIP (0.600", 15.24mm)	32-EDIP (0.600", 15.24mm)	32-EDIP (0.600", 15.24mm)	32-EDIP (0.600", 15.24mm)	32-EDIP (0.600", 15.24mm)	32-EDIP (0.600", 15.24mm)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct substitutes matching the BQ4015MA-70 specification (70 ns access time, 0°C to 70°C operating range) are DS1250Y-70IND+, DS1250AB-70+, DS1250AB-70IND+, and DS1250Y-70+. All are manufactured by Analog Devices Inc./Maxim Integrated and maintain active product status, ensuring long-term availability and supply chain continuity.

DS1250Y-70IND+ and DS1250AB-70IND+ provide extended operating temperature range (-40°C to 85°C) while maintaining 70 ns timing specifications, suitable for applications requiring broader thermal performance margins.

DS1250AB-70+ and DS1250Y-70+ operate within the standard 0°C to 70°C temperature range, directly matching the BQ4015MA-70 thermal specification.

DS1250Y-100+ and DS1250Y-100IND+ feature 100 ns access time and write cycle time. These parts are functionally compatible only in systems where timing margins accommodate the reduced performance specification.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for new designs and legacy system support.

Frequently Asked Questions (FAQ)

Q: Can DS1250Y-100+ or DS1250Y-100IND+ replace the BQ4015MA-70 directly?

A: These parts are electrically compatible but operate at 100 ns access time versus the BQ4015MA-70's 70 ns specification. Substitution is valid only if system timing analysis confirms the slower access time does not violate critical path requirements.

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

A: Both are 32-pin through-hole packages with similar pitch (0.610" vs 0.600"). The EDIP variant used in substitute parts is mechanically compatible with standard 32-DIP footprints, though minor dimensional differences may require PCB layout verification for high-density applications.

Q: Are all substitute parts available in active production?

A: Yes. All listed substitute parts maintain active product status from Analog Devices Inc./Maxim Integrated, ensuring availability for new designs and ongoing procurement.

Q: Does the extended temperature range (-40°C to 85°C) of DS1250Y-70IND+ and DS1250AB-70IND+ affect compatibility?

A: No. Extended temperature range is a superset capability. Parts rated for -40°C to 85°C operate correctly within the BQ4015MA-70's 0°C to 70°C specification window.

Q: Are voltage supply ranges compatible across all substitutes?

A: The BQ4015MA-70 requires 4.75V to 5.5V. DS1250Y variants support 4.5V to 5.5V (wider lower bound), and DS1250AB variants support 4.75V to 5.25V (narrower upper bound). Verify system supply voltage falls within the selected substitute's operating range.

Q: What compliance certifications apply to these parts?

A: All parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronics manufacturing and deployment.

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