DS1225AB-200 NVSRAM 64Kbit Parallel Memory IC Equivalent & Substitute Parts

Part Overview

The DS1225AB-200 is a Non-Volatile SRAM (NVSRAM) memory integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. This 64Kbit parallel memory device operates with a 200 ns access time and is housed in a 28-EDIP package. The part is classified as obsolete, making equivalent and substitute parts necessary for system maintenance, redesign, and procurement continuity. Substitute parts must maintain electrical compatibility across memory capacity, interface type, voltage supply range, operating temperature, and package form factor while meeting modern compliance standards.

Key Parameters

Parameter	DS1225AB-200
Memory Type	Non-Volatile SRAM (NVSRAM)
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	Parallel
Access Time	200 ns
Write Cycle Time	200 ns
Voltage Supply Range	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
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the DS1225AB-200 is determined by strict adherence to the following parameters:

Critical Compatibility Parameters:

Memory Type: Must be NVSRAM (Non-Volatile SRAM)
Memory Size: Must be 64Kbit
Memory Organization: Must be 8K x 8
Memory Interface: Must be Parallel
Package Type: Must be 28-DIP Module (0.600", 15.24mm)
Mounting Type: Must be Through Hole
Voltage Supply Range: Must encompass or match 4.75V ~ 5.25V
Operating Temperature: Must support 0°C ~ 70°C

Performance Parameters (Access/Write Time): Substitute parts may have equal or faster access times. Parts with slower access times are not suitable for direct substitution.

Compliance Parameters: Modern substitutes are RoHS3 compliant and REACH unaffected, representing improvements over the obsolete original part.

Substitute parts are grouped into two categories: direct Analog Devices/Maxim equivalents (DS1225AB series variants) and manufacturer-recommended alternatives from STMicroelectronics (M48Z series).

Parameter Comparison

Parameter	DS1225AB-200	DS1225AB-200+	DS1225AB-70+	M48Z08-100PC1	M48Z58-70PC1
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	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
Memory Interface	Parallel	Parallel	Parallel	Parallel	Parallel
Access Time	200 ns	200 ns	70 ns	100 ns	70 ns
Write Cycle Time	200 ns	200 ns	70 ns	100 ns	70 ns
Voltage Supply Range	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®
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Bulk	Tube	Tube	Tube	Tube

Engineering Selection Recommendations

Direct Manufacturer Equivalents (Analog Devices/Maxim):

DS1225AB-200+ is the direct equivalent with identical electrical specifications and active product status. This part offers RoHS3 compliance and tube packaging, making it suitable for new procurement and system maintenance where the original 200 ns access time is required.

DS1225AB-70+ provides faster performance with 70 ns access time while maintaining all other electrical and mechanical compatibility parameters. This part is suitable for applications where improved performance is acceptable and beneficial.

Manufacturer-Recommended Alternatives (STMicroelectronics):

M48Z08-100PC1 offers intermediate performance at 100 ns access time with a wider voltage supply range (4.75V ~ 5.5V). The 28-PCDIP package with CAPHAT® is mechanically compatible with 28-DIP footprints. This part is suitable for applications requiring STMicroelectronics sourcing or supply chain diversification.

M48Z58-70PC1 provides the fastest performance at 70 ns access time with extended voltage supply range. This part is recommended for performance-critical applications and offers the highest inventory availability among all substitutes.

All substitute parts maintain RoHS3 compliance and REACH unaffected status, representing compliance improvements over the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can DS1225AB-70+ be used as a direct replacement for DS1225AB-200?

A: Yes. DS1225AB-70+ is electrically and mechanically compatible. The 70 ns access time is faster than the original 200 ns specification, making it a suitable upgrade. All other parameters including voltage supply, operating temperature, memory capacity, and package form factor are identical.

Q: What is the difference between 28-EDIP and 28-PCDIP packages?

A: Both are 28-pin DIP packages with 0.600" (15.24mm) width and are mechanically compatible for through-hole mounting. EDIP refers to Enhanced DIP, while PCDIP refers to Plastic DIP. The CAPHAT® designation on STMicroelectronics parts indicates a ceramic capacitor integrated into the package. Pin compatibility and PCB footprint requirements are equivalent.

Q: Are STMicroelectronics M48Z series parts fully compatible with the DS1225AB-200?

A: Yes. M48Z08-100PC1 and M48Z58-70PC1 meet all critical compatibility parameters: 64Kbit NVSRAM, 8K x 8 organization, parallel interface, 28-DIP package, through-hole mounting, and 0°C ~ 70°C operating temperature. Voltage supply ranges are wider (4.75V ~ 5.5V), providing additional margin. Access times are equal or faster.

Q: Why is the DS1225AB-200 marked as obsolete?

A: The DS1225AB-200 is no longer in active production by Analog Devices/Maxim Integrated. Active equivalents (DS1225AB-200+, DS1225AB-70+) and manufacturer-recommended alternatives (M48Z series) are available for new designs and system maintenance.

Q: Which substitute part should be selected for new designs?

A: Selection depends on performance requirements and sourcing preferences. For Analog Devices/Maxim sourcing, DS1225AB-70+ is recommended due to improved 70 ns performance and active status. For STMicroelectronics sourcing or supply chain diversification, M48Z58-70PC1 is recommended due to fastest performance and highest inventory availability.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (DS1225AB-200+, DS1225AB-70+, M48Z08-100PC1, M48Z58-70PC1) are ROHS3 compliant, representing an improvement over the RoHS non-compliant original part.

Q: What is the voltage supply range compatibility?

A: The original DS1225AB-200 requires 4.75V ~ 5.25V. All substitute parts support this range. STMicroelectronics M48Z series parts extend the upper limit to 5.5V, providing additional voltage margin for system designs.

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