DS1249AB-70IND NVSRAM Equivalent & Substitute Parts

Part Overview

The DS1249AB-70IND is a Non-Volatile SRAM (NVSRAM) memory integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. This 2Mbit 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 classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile SRAM (NVSRAM)
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	Parallel
Access Time	70 ns
Write Cycle Time	70 ns
Supply Voltage	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Package Type	32-DIP Module (0.600", 15.24mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the DS1249AB-70IND is determined by strict equivalence across the following critical parameters:

Memory Type: Non-Volatile SRAM (NVSRAM)
Memory Capacity: 2Mbit
Memory Organization: 256K x 8
Interface Type: Parallel
Access Time: 70 ns or faster
Write Cycle Time: 70 ns or faster
Supply Voltage Range: 4.75V ~ 5.25V
Operating Temperature Range: -40°C ~ 85°C minimum
Package: 32-DIP Module (0.600", 15.24mm)
Mounting: Through Hole

Only parts meeting all these parameters without deviation are considered direct substitutes. Packaging format variations (tube vs. other formats) do not affect functional equivalence.

Parameter Comparison

Parameter	DS1249AB-70IND (Main)	DS1249AB-70IND# (Substitute)
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Memory Type	Non-Volatile SRAM	Non-Volatile SRAM
Memory Size	2Mbit	2Mbit
Memory Organization	256K x 8	256K x 8
Memory Interface	Parallel	Parallel
Access Time	70 ns	70 ns
Write Cycle Time	70 ns	70 ns
Supply Voltage	4.75V ~ 5.25V	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	32-DIP Module (0.600", 15.24mm)	32-DIP Module (0.600", 15.24mm)
Mounting Type	Through Hole	Through Hole
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Packaging Format	Standard	Tube

Engineering Selection Recommendations

The DS1249AB-70IND# serves as the direct functional equivalent to the DS1249AB-70IND. Both parts are manufactured by Analog Devices Inc./Maxim Integrated and share identical electrical and mechanical specifications across all critical parameters.

The primary distinction is product status: the original DS1249AB-70IND is obsolete, while DS1249AB-70IND# maintains active production status. This availability difference makes DS1249AB-70IND# the appropriate selection for new designs and ongoing system support.

Additionally, DS1249AB-70IND# carries ROHS3 compliance certification, whereas the original part is RoHS non-compliant. This compliance difference may be relevant for applications subject to regulatory requirements or customer specifications mandating RoHS compliance.

Both parts are supplied with Moisture Sensitivity Level (MSL) 1 (Unlimited) and carry identical REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: Can DS1249AB-70IND# be used as a direct replacement for DS1249AB-70IND?

A: Yes. Both parts are electrically and mechanically identical across all functional parameters. The DS1249AB-70IND# is the active production equivalent of the obsolete DS1249AB-70IND.

Q: What is the difference between the two part numbers?

A: The primary differences are product status (obsolete vs. active) and RoHS compliance (non-compliant vs. ROHS3 compliant). The "#" suffix on DS1249AB-70IND# indicates the active variant. Electrical performance and package specifications are identical.

Q: Are there packaging differences between these parts?

A: The DS1249AB-70IND# is supplied in tube packaging, while the original DS1249AB-70IND uses standard packaging. Both use the same 32-DIP Module (0.600", 15.24mm) physical form factor. Packaging format does not affect functional compatibility.

Q: What memory capacity and organization does this part provide?

A: The DS1249AB-70IND provides 2Mbit total capacity organized as 256K x 8 (256,000 locations of 8 bits each) with parallel interface access.

Q: What are the timing specifications?

A: Both access time and write cycle time are specified at 70 nanoseconds, supporting synchronous parallel memory operations at this speed.

Q: What supply voltage is required?

A: The part operates on a 5V supply with a tolerance range of 4.75V to 5.25V, standard for TTL-compatible logic circuits.

Q: What temperature range is supported?

A: The operating temperature range is -40°C to 85°C, suitable for industrial and commercial applications.

Q: Is this part suitable for new designs?

A: DS1249AB-70IND# is recommended for new designs due to its active production status and ROHS3 compliance. The original DS1249AB-70IND is obsolete and should not be specified for new applications.

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