DS1225AB-85 NVSRAM 64Kbit Parallel Memory IC Equivalent & Substitute Parts

Part Overview

The DS1225AB-85 is a Non-Volatile SRAM (NVSRAM) memory IC manufactured by Analog Devices Inc./Maxim Integrated, featuring 64Kbit capacity with parallel interface and 85 ns access time in 28-EDIP packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for system maintenance, redesign, and procurement continuity. The DS1225AB-85 combines SRAM speed with non-volatile storage capability, making it suitable for applications requiring data retention without external power.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile SRAM (NVSRAM)
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	Parallel
Access Time	85 ns
Write Cycle Time	85 ns
Supply Voltage	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Package Type	28-DIP Module (0.600", 15.24mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the DS1225AB-85 is determined by the following critical parameters that must remain compatible:

Core Compatibility Parameters:

Memory Type: Non-Volatile SRAM (NVSRAM)
Memory Size: 64Kbit
Memory Organization: 8K x 8
Memory Interface: Parallel
Package Type: 28-DIP Module (0.600", 15.24mm)
Mounting Type: Through Hole
Operating Temperature Range: 0°C ~ 70°C

Performance Parameters (Substitution Allowed):

Access Time: Equal to or faster than 85 ns
Write Cycle Time: Equal to or faster than 85 ns
Supply Voltage: Must encompass or match 4.75V ~ 5.25V range

Substitute parts are grouped into two categories: direct Analog Devices/Maxim equivalents (DS1225 series) and cross-manufacturer alternatives (STMicroelectronics M48Z series). All substitute parts maintain identical memory capacity, organization, and interface specifications while offering improved performance characteristics or enhanced compliance status.

Parameter Comparison

Parameter	DS1225AB-85	DS1225AB-70+	DS1225AB-85+	M48Z58-70PC1	M48Z08-100PC1
Manufacturer	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	STMicroelectronics	STMicroelectronics
Memory Type	NVSRAM	NVSRAM	NVSRAM	NVSRAM	NVSRAM
Memory Size	64Kbit	64Kbit	64Kbit	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8	8K x 8	8K x 8	8K x 8
Access Time	85 ns	70 ns	85 ns	70 ns	100 ns
Write Cycle Time	85 ns	70 ns	85 ns	70 ns	100 ns
Supply Voltage	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.5V	4.75V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package Type	28-EDIP	28-EDIP	28-EDIP	28-PCDIP, CAPHAT®	28-PCDIP, CAPHAT®
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Analog Devices/Maxim DS1225 Series (Direct Equivalents):

DS1225AB-70+ and DS1225AB-85+ are direct manufacturer equivalents available in active product status with ROHS3 compliance. Both parts maintain identical electrical specifications and 28-EDIP packaging as the original DS1225AB-85. DS1225AB-70+ offers improved performance with 70 ns access time while DS1225AB-85+ matches the original 85 ns specification. Both are suitable for direct replacement in existing designs without layout or interface modifications.

STMicroelectronics M48Z Series (Cross-Manufacturer Alternatives):

M48Z58-70PC1 and M48Z08-100PC1 provide cross-manufacturer substitution with identical memory capacity and organization. Both parts feature expanded supply voltage range (4.75V ~ 5.5V) and ROHS3 compliance. Package designation differs (28-PCDIP with CAPHAT® versus 28-EDIP), requiring verification of physical compatibility with existing PCB footprints and socket specifications. M48Z58-70PC1 delivers 70 ns performance while M48Z08-100PC1 operates at 100 ns.

Compliance and Availability:

All substitute parts maintain REACH unaffected status and EAR99 export classification. Active product status ensures long-term availability and supply chain continuity compared to the obsolete DS1225AB-85. ROHS3 compliance of all substitutes supports modern manufacturing and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can DS1225AB-70+ directly replace DS1225AB-85 in existing designs?

A: Yes. DS1225AB-70+ is a direct equivalent with identical electrical specifications, memory organization, and 28-EDIP packaging. The 70 ns access time is faster than the original 85 ns specification, ensuring backward compatibility. No design modifications are required.

Q: What is the difference between DS1225AB-85+ and DS1225AB-85?

A: DS1225AB-85+ is the active production equivalent of the obsolete DS1225AB-85. Both share identical electrical specifications and 28-EDIP packaging. DS1225AB-85+ offers ROHS3 compliance and active product status, ensuring continued availability and modern manufacturing standards.

Q: Can STMicroelectronics M48Z series parts replace Analog Devices DS1225 parts?

A: M48Z series parts are functionally equivalent with identical memory capacity, organization, and parallel interface. However, package designation differs (28-PCDIP with CAPHAT® versus 28-EDIP). Physical compatibility with existing PCB footprints and socket specifications must be verified before substitution.

Q: What is the significance of the expanded supply voltage range in M48Z parts?

A: STMicroelectronics M48Z series parts specify 4.75V ~ 5.5V supply voltage compared to 4.75V ~ 5.25V for DS1225 parts. This expanded upper limit provides additional design margin in systems with higher supply voltage tolerance, though both ranges are compatible with standard 5V logic systems.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (DS1225AB-70+, DS1225AB-85+, M48Z58-70PC1, M48Z08-100PC1) are ROHS3 compliant. The original DS1225AB-85 is RoHS non-compliant, making compliant substitutes necessary for new designs and manufacturing processes requiring RoHS certification.

Q: What performance difference exists between M48Z58-70PC1 and M48Z08-100PC1?

A: M48Z58-70PC1 operates at 70 ns access and write cycle time, while M48Z08-100PC1 operates at 100 ns. Both are functionally equivalent with identical memory capacity and organization. Selection depends on system timing requirements and performance specifications.

Q: Is inventory availability a factor in substitute selection?

A: Inventory levels vary across substitute parts. DS1225AB-85+ and M48Z58-70PC1 maintain substantial stock levels. All substitute parts are active products with established supply chains, providing superior availability compared to the obsolete DS1225AB-85.

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