DS1249Y-85# NVSRAM Equivalent & Substitute Parts

Part Overview

The DS1249Y-85# is a 2Mbit Non-Volatile SRAM (NVSRAM) memory IC manufactured by Analog Devices Inc./Maxim Integrated, featuring parallel interface architecture in a 32-EDIP package. This component integrates SRAM speed with non-volatile storage capability, operating at 85 ns access time across a 256K x 8 memory organization.

The DS1249Y-85# is classified as obsolete. Equivalent and substitute parts are available from the same manufacturer family with active product status, offering identical core functionality with variations in access time specifications and operating temperature ranges.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile SRAM (NVSRAM)
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	Parallel
Access Time	85 ns
Write Cycle Time	85 ns
Supply Voltage	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	32-DIP Module (0.600", 15.24mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution within the DS1249Y family is determined by three critical parameters: memory capacity (fixed at 2Mbit), package configuration (fixed at 32-EDIP), and access time specification. The DS1249Y-85# can be substituted with parts sharing identical memory organization and package while meeting or exceeding performance requirements.

Access time variants within this family range from 70 ns to 100 ns. Parts with faster or equal access times (70 ns) are direct functional equivalents. Parts with slower access times (100 ns) are suitable only when system timing permits the increased latency.

Operating temperature range varies between commercial grade (0°C ~ 70°C) and industrial grade (-40°C ~ 85°C). Industrial grade variants provide extended temperature operation and are compatible with commercial applications.

All substitute parts maintain identical supply voltage requirements (4.5V ~ 5.5V), package dimensions, and compliance certifications (ROHS3, REACH Unaffected).

Parameter Comparison

Part Number	Product Status	Access Time (ns)	Write Cycle Time (ns)	Operating Temperature	Inventory (Pcs)
DS1249Y-85#	Obsolete	85	85	0°C ~ 70°C	928
DS1249Y-70#	Active	70	70	0°C ~ 70°C	828
DS1249Y-70IND#	Active	70	70	-40°C ~ 85°C	1057
DS1249Y-85IND#	Active	85	85	-40°C ~ 85°C	1019
DS1249Y-100#	Active	100	100	0°C ~ 70°C	1277

Engineering Selection Recommendations

For direct replacement of DS1249Y-85# in commercial temperature applications, DS1249Y-85IND# provides identical electrical performance with extended operating temperature range (-40°C ~ 85°C) and active product status. This part maintains 85 ns access and write cycle times while offering superior long-term availability.

DS1249Y-70# and DS1249Y-70IND# offer improved performance with 70 ns access times, suitable for applications where faster memory access is beneficial. DS1249Y-70IND# is recommended for designs requiring industrial temperature operation.

DS1249Y-100# is suitable only when system timing specifications permit 100 ns access latency. This part offers the highest current inventory availability.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original DS1249Y-85#.

Frequently Asked Questions (FAQ)

Q: Can DS1249Y-70# directly replace DS1249Y-85# in existing designs?

A: Yes. DS1249Y-70# provides faster access time (70 ns versus 85 ns) and is electrically compatible. System timing will improve or remain unaffected. Both parts operate at identical supply voltage (4.5V ~ 5.5V) and use the same 32-EDIP package.

Q: What is the difference between DS1249Y-85IND# and DS1249Y-85#?

A: Both parts share identical access time (85 ns) and electrical specifications. DS1249Y-85IND# operates across extended temperature range (-40°C ~ 85°C) versus commercial range (0°C ~ 70°C) for DS1249Y-85#. DS1249Y-85IND# has active product status, ensuring continued availability.

Q: Is DS1249Y-100# compatible with DS1249Y-85# applications?

A: DS1249Y-100# is compatible only if system timing permits 100 ns access latency. The slower access time may violate timing requirements in designs optimized for 85 ns operation. Verify timing margins before substitution.

Q: Are all substitute parts in the same package?

A: Yes. All parts use 32-DIP Module (0.600", 15.24mm) with 32-EDIP supplier package designation. Pin-for-pin compatibility is maintained across all variants.

Q: What compliance certifications apply to substitute parts?

A: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original DS1249Y-85# certifications.

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