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

Part Overview

The DS1225AB-85+ is a Non-Volatile SRAM (NVSRAM) memory integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. This 64Kbit parallel memory device combines SRAM speed with non-volatile storage capability, operating at 85 nanosecond access time in a 28-pin DIP package. The device is Active status and ROHS3 compliant, making it suitable for legacy system maintenance and replacement applications where equivalent performance is required.

Substitute parts are necessary when the primary part number becomes unavailable, when inventory constraints require alternative sourcing, or when design flexibility permits selection from qualified equivalent devices that meet the same electrical and mechanical specifications.

Substiute Parts

DS1225AB-85+

Analog Devices Inc./Maxim IntegratedIn Stock: 1179DS1225AB-85+ Datasheet

Current PartRFQ

DS1225AB-70+

Analog Devices Inc./Maxim IntegratedIn Stock: 1078DS1225AB-70+ Datasheet

DirectRFQ

DS1225AB-85+

Analog Devices Inc./Maxim IntegratedIn Stock: 1179DS1225AB-85+ Datasheet

DirectRFQ

M48Z08-100PC1

STMicroelectronicsIn Stock: 1494M48Z08-100PC1 Datasheet

MFR RecommendedRFQ

M48Z58-70PC1

STMicroelectronicsIn Stock: 3717M48Z58-70PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS1225AB-85+ is determined by the following critical parameters:

Core Compatibility Requirements:

• 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 Within Limits):

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

Substitute parts must maintain identical memory capacity, organization, and interface characteristics. Access time and write cycle time may be equal or superior (faster). Supply voltage ranges must be compatible with the primary device's operating range.

Parameter Comparison

Engineering Selection Recommendations

DS1225AB-70+ (Analog Devices Inc./Maxim Integrated) Direct substitute from the same manufacturer. Identical electrical specifications except for superior access time (70 ns versus 85 ns). Same package type (28-EDIP), supply voltage range, and operating temperature. ROHS3 compliant. Suitable for direct replacement in applications where faster access time is acceptable or beneficial.

M48Z58-70PC1 (STMicroelectronics) Manufacturer-recommended equivalent. Meets all core memory specifications (64Kbit, 8K x 8, parallel interface). Access time of 70 ns exceeds performance of primary part. Supply voltage range extends to 5.5V, providing broader compatibility. Package variant is 28-PCDIP with CAPHAT® feature. ROHS3 compliant. Highest inventory availability (3636 units).

M48Z08-100PC1 (STMicroelectronics) Manufacturer-recommended equivalent. Meets all core memory specifications. Access time of 100 ns is slower than primary part but remains within acceptable tolerance for non-time-critical applications. Supply voltage range extends to 5.5V. Package variant is 28-PCDIP with CAPHAT® feature. ROHS3 compliant.

All substitute parts maintain Active product status and ROHS3 compliance. Selection should be based on availability, access time requirements, and package compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can DS1225AB-70+ be used as a direct replacement for DS1225AB-85+? A: Yes. The DS1225AB-70+ is a direct substitute from the same manufacturer with identical memory capacity, organization, interface, package type, and supply voltage specifications. The 70 ns access time is faster than the 85 ns specification, making it functionally compatible for all applications designed for the DS1225AB-85+.

Q: What is the difference between 28-EDIP and 28-PCDIP packaging? A: Both are 28-pin DIP packages with 0.600" (15.24mm) body width and through-hole mounting. The EDIP variant is used by Analog Devices/Maxim Integrated, while PCDIP with CAPHAT® is the STMicroelectronics package variant. Physical dimensions and pin assignments are compatible for PCB mounting purposes.

Q: Are STMicroelectronics M48Z series parts compatible with Analog Devices DS1225 series? A: Yes, when specifications align. Both manufacturers produce 64Kbit NVSRAM devices with identical memory organization (8K x 8), parallel interface, and 28-DIP package footprint. Electrical specifications (supply voltage, operating temperature, access time) must be verified for specific application requirements.

Q: Can M48Z08-100PC1 be used where DS1225AB-85+ is specified? A: M48Z08-100PC1 meets all core memory and package specifications but has a slower access time (100 ns versus 85 ns). Substitution is acceptable only if the application does not require the faster 85 ns performance. Verify timing-critical circuit requirements before selection.

Q: What does ROHS3 compliance mean for these parts? A: ROHS3 compliance indicates the device meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All listed substitute parts are ROHS3 compliant, ensuring environmental and regulatory compatibility.

Q: Is supply voltage range compatibility critical for substitution? A: Yes. The primary DS1225AB-85+ operates at 4.75V ~ 5.25V. STMicroelectronics parts extend to 5.5V maximum. Verify that the application power supply falls within the overlapping range (4.75V ~ 5.25V) to ensure compatibility with all substitute options.