BQ4010YMA-70 NVSRAM 64Kbit Parallel Memory IC Equivalent & Substitute Parts

Part Overview

The BQ4010YMA-70 is a 64Kbit Non-Volatile SRAM (NVSRAM) memory IC manufactured by Texas Instruments, featuring parallel interface architecture with 70 ns access time in a 28-DIP package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing system support and new designs. The BQ4010YMA-70 operates within the 4.5V to 5.5V supply range and supports 8K x 8 memory organization with through-hole mounting.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile SRAM (NVSRAM)
Memory Size	64Kbit
Memory Organization	8K 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
Mounting Type	Through Hole
Package Type	28-DIP Module
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BQ4010YMA-70 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Memory Type: Non-Volatile SRAM (NVSRAM)
Memory Size: 64Kbit
Memory Organization: 8K x 8
Memory Interface: Parallel
Mounting Type: Through Hole
Package Category: 28-DIP Module variants

Performance Compatibility Parameters:

Access Time: 70 ns (primary specification) or faster alternatives
Write Cycle Time: 70 ns (primary specification) or faster alternatives
Voltage Supply Range: 4.5V ~ 5.5V (compatible range) or wider ranges
Operating Temperature: 0°C ~ 70°C (compatible range) or extended ranges

All substitute parts listed maintain identical memory capacity, organization, and parallel interface architecture. Variations in access time, voltage tolerance, and temperature range represent functional enhancements or industrial-grade alternatives suitable for the BQ4010YMA-70 application space.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Organization	Access Time (ns)	Write Cycle (ns)	Voltage Supply	Operating Temp	Package	Product Status
BQ4010YMA-70	Texas Instruments	64Kbit	8K x 8	70	70	4.5V ~ 5.5V	0°C ~ 70°C	28-DIP	Obsolete
M48Z58Y-70PC1	STMicroelectronics	64Kbit	8K x 8	70	70	4.5V ~ 5.5V	0°C ~ 70°C	28-PCDIP	Active
DS1225AB-70+	Analog Devices Inc./Maxim Integrated	64Kbit	8K x 8	70	70	4.75V ~ 5.25V	0°C ~ 70°C	28-EDIP	Active
DS1225AB-70IND+	Analog Devices Inc./Maxim Integrated	64Kbit	8K x 8	70	70	4.75V ~ 5.25V	-40°C ~ 85°C	28-EDIP	Active
DS1225AB-85+	Analog Devices Inc./Maxim Integrated	64Kbit	8K x 8	85	85	4.75V ~ 5.25V	0°C ~ 70°C	28-EDIP	Active
DS1225AB-150+	Analog Devices Inc./Maxim Integrated	64Kbit	8K x 8	150	150	4.75V ~ 5.25V	0°C ~ 70°C	28-EDIP	Active
DS1225AB-150IND+	Analog Devices Inc./Maxim Integrated	64Kbit	8K x 8	150	150	4.75V ~ 5.25V	-40°C ~ 85°C	28-EDIP	Active
DS1225AB-200+	Analog Devices Inc./Maxim Integrated	64Kbit	8K x 8	200	200	4.75V ~ 5.25V	0°C ~ 70°C	28-EDIP	Active
DS1225AD-70+	Analog Devices Inc./Maxim Integrated	64Kbit	8K x 8	70	70	4.5V ~ 5.5V	0°C ~ 70°C	28-EDIP	Active
DS1225AD-150+	Analog Devices Inc./Maxim Integrated	64Kbit	8K x 8	150	150	4.5V ~ 5.5V	0°C ~ 70°C	28-EDIP	Active
DS1225AD-200+	Analog Devices Inc./Maxim Integrated	64Kbit	8K x 8	200	200	4.5V ~ 5.5V	0°C ~ 70°C	28-EDIP	Active

Engineering Selection Recommendations

Direct Replacement (Matched Specifications): The M48Z58Y-70PC1 from STMicroelectronics provides the closest electrical and mechanical match to the BQ4010YMA-70, maintaining identical 70 ns access time, 4.5V to 5.5V supply range, and 0°C to 70°C operating temperature. This part is active in production status and ROHS3 compliant. Package variation from 28-DIP to 28-PCDIP (plastic ceramic DIP) requires mechanical verification for PCB footprint compatibility.

Primary Alternatives (Matched Electrical Specifications): The DS1225AD-70+ from Analog Devices Inc./Maxim Integrated matches all electrical parameters of the BQ4010YMA-70 including 70 ns access time and 4.5V to 5.5V supply range. This part is active in production and ROHS3 compliant. The 28-EDIP package requires footprint compatibility assessment.

Extended Temperature Range Alternative: The DS1225AB-70IND+ provides 70 ns access time matching with extended operating temperature range (-40°C to 85°C), suitable for applications requiring industrial-grade thermal performance. Voltage supply range is narrower at 4.75V to 5.25V.

Slower Access Time Alternatives: Parts with 85 ns, 150 ns, or 200 ns access times (DS1225AB-85+, DS1225AB-150+, DS1225AB-200+, DS1225AD-150+, DS1225AD-200+) are functionally compatible substitutes where system timing permits slower memory access. These alternatives expand inventory availability and may offer cost optimization.

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring regulatory and environmental compatibility with the original BQ4010YMA-70 specification.

Frequently Asked Questions (FAQ)

Q: Can the M48Z58Y-70PC1 directly replace the BQ4010YMA-70 without circuit modification?

A: The M48Z58Y-70PC1 matches all electrical specifications (64Kbit NVSRAM, 70 ns access time, 4.5V to 5.5V supply, 0°C to 70°C operating range, 8K x 8 organization, parallel interface). Package compatibility requires verification: the BQ4010YMA-70 uses 28-DIP while the M48Z58Y-70PC1 uses 28-PCDIP. If PCB footprints are identical, substitution is direct. If footprints differ, adapter solutions or PCB redesign may be necessary.

Q: What is the difference between DS1225AB and DS1225AD variants?

A: Both DS1225AB and DS1225AD series are 64Kbit NVSRAM devices with identical memory organization and parallel interface. The primary difference is voltage supply range: DS1225AB operates at 4.75V to 5.25V (narrower tolerance), while DS1225AD operates at 4.5V to 5.5V (wider tolerance matching the BQ4010YMA-70). For applications with strict 4.5V to 5.5V supply requirements, DS1225AD variants are preferred.

Q: Can I use a slower access time part (150 ns or 200 ns) as a substitute?

A: Slower access time parts are functionally compatible if system timing permits. The BQ4010YMA-70 specifies 70 ns access time; substituting with 150 ns or 200 ns parts introduces additional memory latency. This substitution is valid only if the application's timing budget accommodates the slower access time. Verify system-level timing requirements before selecting slower alternatives.

Q: What does the "IND+" suffix indicate in part numbers like DS1225AB-70IND+?

A: The "IND+" suffix indicates industrial-grade temperature range (-40°C to 85°C) compared to commercial-grade (0°C to 70°C). Industrial variants are suitable for extended temperature applications but maintain identical electrical and memory specifications. Selection depends on operating environment requirements.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the BQ4010YMA-70 environmental compliance profile. This ensures regulatory compatibility for applications subject to ROHS3 requirements.

Q: What package types are used across substitute parts, and are they interchangeable?

A: The BQ4010YMA-70 uses 28-DIP packaging. Substitutes use 28-PCDIP (M48Z58Y-70PC1) or 28-EDIP (DS1225 series). While all are 28-pin DIP variants with 0.6" width, physical dimensions and pin spacing may differ. PCB footprint compatibility must be verified before substitution. Consult package datasheets for precise dimensional specifications.

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