DS1245AB-85 NVSRAM Equivalent & Substitute Parts

Part Overview

The DS1245AB-85 is a Non-Volatile SRAM (NVSRAM) memory integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. This 1Mbit parallel memory device combines SRAM speed with non-volatile storage capability, making it suitable for applications requiring data retention without external power. The part is currently listed as obsolete, necessitating identification of functionally equivalent alternatives from the active product line to maintain design continuity and ensure supply availability.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile SRAM (NVSRAM)
Memory Size	1Mbit
Memory Organization	128K 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	32-DIP Module (0.600", 15.24mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the DS1245AB-85 is determined by strict equivalence across the following critical parameters:

Memory capacity and organization (1Mbit, 128K x 8)
Memory technology (NVSRAM)
Interface type (Parallel)
Package and pinout (32-DIP Module, 0.600")
Electrical specifications (Supply voltage 4.75V ~ 5.25V, operating temperature 0°C ~ 70°C)
Access and write cycle timing compatibility

The DS1245AB series maintains identical memory architecture and pinout across speed grades. Substitute parts must meet or exceed the timing specifications of the original part while maintaining full electrical and mechanical compatibility.

Parameter Comparison

Parameter	DS1245AB-85 (Main)	DS1245AB-70+	DS1245AB-85+
Memory Type	Non-Volatile SRAM	Non-Volatile SRAM	Non-Volatile SRAM
Memory Size	1Mbit	1Mbit	1Mbit
Memory Organization	128K x 8	128K x 8	128K x 8
Memory Interface	Parallel	Parallel	Parallel
Access Time	85 ns	70 ns	85 ns
Write Cycle Time	85 ns	70 ns	85 ns
Supply Voltage	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	32-DIP Module (0.600")	32-DIP Module (0.600")	32-DIP Module (0.600")
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both DS1245AB-70+ and DS1245AB-85+ are direct functional replacements for the obsolete DS1245AB-85. Selection between these alternatives is based on the following criteria:

DS1245AB-85+ provides exact timing equivalence to the original part (85 ns access and write cycle time) while offering active product status and ROHS3 compliance. This part is the primary recommendation for direct replacement in existing designs without timing margin modifications.

DS1245AB-70+ offers improved performance with faster access and write cycle times (70 ns) while maintaining full electrical and mechanical compatibility. This part is suitable for applications where faster memory access provides system-level benefits and where the design can accommodate the improved timing specification.

Both substitute parts are available in active production with higher inventory levels than the obsolete original part, ensuring supply continuity. Both maintain identical pinout, package dimensions, and electrical operating ranges, enabling direct socket substitution.

Frequently Asked Questions (FAQ)

Q: Can DS1245AB-70+ be used as a direct replacement for DS1245AB-85?

A: Yes. The DS1245AB-70+ is electrically and mechanically compatible with the DS1245AB-85. The faster 70 ns timing specification of the DS1245AB-70+ exceeds the 85 ns requirement of the original part, ensuring full functional compatibility in all applications designed for the DS1245AB-85.

Q: What is the difference between DS1245AB-85+ and DS1245AB-85?

A: Both parts share identical electrical specifications and timing (85 ns access and write cycle time). The primary differences are product status (DS1245AB-85+ is active versus obsolete for DS1245AB-85) and RoHS compliance (DS1245AB-85+ is ROHS3 compliant). The "+" designation indicates the active production variant with updated compliance certifications.

Q: Are the package dimensions identical across all three parts?

A: Yes. All three parts use the 32-DIP Module package with 0.600" (15.24mm) body width and Through Hole mounting. Pin-to-pin compatibility is maintained, enabling direct socket substitution without PCB modifications.

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

A: DS1245AB-85+ is recommended for new designs requiring exact timing equivalence to legacy specifications. DS1245AB-70+ is suitable when improved performance is beneficial and system timing margins accommodate the faster specification.

Q: Are there any compliance differences between the substitute parts?

A: DS1245AB-70+ and DS1245AB-85+ are both ROHS3 compliant. The original DS1245AB-85 is RoHS non-compliant. Both active production parts meet current environmental and regulatory requirements for component procurement.

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