BQ4015YMA-70 NVSRAM 4Mbit Parallel Memory IC Equivalent & Substitute Parts

Part Overview

The BQ4015YMA-70 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 alternatives for new designs and production continuity. The part operates at 70 ns access time with supply voltage range of 4.5V to 5.5V and is housed in a 32-DIP module package rated for 0°C to 70°C operating temperature. Substitute parts must maintain functional equivalence in memory capacity, interface type, and electrical performance characteristics.

Key Parameters

Parameter	BQ4015YMA-70
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	4.5V – 5.5V
Operating Temperature	0°C – 70°C
Package Type	32-DIP Module
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution validity for the BQ4015YMA-70 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

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

Secondary Compatibility Parameters:

Access Time: Equal to or faster than 70 ns
Write Cycle Time: Equal to or faster than 70 ns
Voltage Supply Range: Must encompass or be compatible with 4.5V – 5.5V
Operating Temperature: Must support minimum 0°C – 70°C range

All substitute parts listed below are manufactured by Analog Devices Inc./Maxim Integrated and maintain active product status. Substitutes are grouped by access time specification (70 ns and 100 ns variants) and temperature rating (commercial 0°C – 70°C and industrial -40°C – 85°C).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Organization	Access Time	Write Cycle Time	Voltage Supply	Operating Temp	Package	Status
BQ4015YMA-70	Texas Instruments	4Mbit	512K x 8	70 ns	70 ns	4.5V – 5.5V	0°C – 70°C	32-DIP Module	Obsolete
DS1250AB-70+	Analog Devices/Maxim	4Mbit	512K x 8	70 ns	70 ns	4.75V – 5.25V	0°C – 70°C	32-EDIP	Active
DS1250AB-70IND+	Analog Devices/Maxim	4Mbit	512K x 8	70 ns	70 ns	4.75V – 5.25V	-40°C – 85°C	32-EDIP	Active
DS1250Y-70+	Analog Devices/Maxim	4Mbit	512K x 8	70 ns	70 ns	4.5V – 5.5V	0°C – 70°C	32-EDIP	Active
DS1250Y-70IND+	Analog Devices/Maxim	4Mbit	512K x 8	70 ns	70 ns	4.5V – 5.5V	-40°C – 85°C	32-EDIP	Active
DS1250Y-100+	Analog Devices/Maxim	4Mbit	512K x 8	100 ns	100 ns	4.5V – 5.5V	0°C – 70°C	32-EDIP	Active
DS1250Y-100IND+	Analog Devices/Maxim	4Mbit	512K x 8	100 ns	100 ns	4.5V – 5.5V	-40°C – 85°C	32-EDIP	Active

Engineering Selection Recommendations

Direct Functional Equivalents (70 ns Access Time):

DS1250Y-70+ and DS1250Y-70IND+ are the primary substitutes for the BQ4015YMA-70, maintaining identical 70 ns access and write cycle times with matching 4Mbit capacity and 512K x 8 organization. DS1250Y-70+ operates within the commercial temperature range (0°C – 70°C) and supply voltage 4.5V – 5.5V, providing direct compatibility for standard applications. DS1250Y-70IND+ extends the operating temperature range to -40°C – 85°C for industrial environments while maintaining the same voltage supply specification.

DS1250AB-70+ and DS1250AB-70IND+ offer equivalent 70 ns performance with a narrower voltage supply range (4.75V – 5.25V). These parts are suitable for applications where the tighter voltage specification is acceptable. DS1250AB-70IND+ provides industrial temperature rating (-40°C – 85°C).

Alternative Substitutes (100 ns Access Time):

DS1250Y-100+ and DS1250Y-100IND+ provide 4Mbit NVSRAM functionality with 100 ns access time, representing a slower alternative suitable only for applications where timing constraints permit. These parts maintain the same memory organization and parallel interface but require system timing verification before implementation.

All substitute parts are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can DS1250Y-100+ be used as a direct replacement for BQ4015YMA-70?

A: DS1250Y-100+ is functionally compatible in terms of memory capacity, organization, and interface type. However, the 100 ns access time is slower than the original 70 ns specification. Substitution is valid only if system timing requirements permit the slower access time. Verify timing margins in your application before implementation.

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

A: Both parts maintain identical 70 ns access time and electrical specifications. The primary difference is operating temperature range: DS1250Y-70+ operates 0°C – 70°C (commercial), while DS1250Y-70IND+ operates -40°C – 85°C (industrial). Select based on your application's environmental requirements.

Q: Are the DS1250 series parts pin-compatible with BQ4015YMA-70?

A: All substitute parts use 32-DIP module packaging with Through Hole mounting. The DS1250 series uses 32-EDIP package designation, which is mechanically and electrically compatible with the original 32-DIP module footprint. Verify PCB layout compatibility before production implementation.

Q: What is the voltage supply difference between DS1250Y and DS1250AB series?

A: DS1250Y series operates at 4.5V – 5.5V supply voltage range, matching the original BQ4015YMA-70 specification. DS1250AB series operates at a narrower range of 4.75V – 5.25V. Select DS1250Y series for applications requiring the wider voltage tolerance of the original part.

Q: Which substitute part offers the best long-term availability?

A: All listed substitute parts carry active product status from Analog Devices Inc./Maxim Integrated. DS1250Y-70IND+ offers the broadest environmental rating (-40°C – 85°C) and highest inventory levels (6375 pcs), providing optimal supply chain continuity for production applications.

Q: Can I use a 100 ns part in a design originally specified for 70 ns?

A: Substitution with 100 ns access time parts requires system-level timing analysis. Verify that the slower access time does not violate setup/hold time requirements, address-to-data propagation timing, or other critical timing paths in your application. Timing margin verification is mandatory before production use.

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