DS1270AB-70IND# NVSRAM Equivalent & Substitute Parts

Part Overview

The DS1270AB-70IND# is a 16Mbit Non-Volatile SRAM (NVSRAM) memory integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. This parallel interface memory device operates at 70 ns access time and is housed in a 36-EDIP package. The part is currently classified as obsolete, making identification of compatible substitute components essential for system maintenance, repair, and legacy product support.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile SRAM (NVSRAM)
Memory Size	16Mbit
Memory Organization	2M 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	36-DIP Module (36-EDIP)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the DS1270AB-70IND# is determined by strict equivalence across the following critical parameters:

Memory capacity and organization (16Mbit, 2M x 8 configuration)
Interface type (parallel)
Access and write cycle timing (70 ns)
Package form factor (36-EDIP)
Through-hole mounting compatibility
Supply voltage range compatibility
Operating temperature range
RoHS and regulatory compliance status

The DS1270Y-70IND# qualifies as a direct substitute based on identical memory specifications, timing characteristics, package configuration, and compliance certifications. The primary distinction is product status: DS1270AB-70IND# is obsolete, while DS1270Y-70IND# is active production.

Parameter Comparison

Parameter	DS1270AB-70IND#	DS1270Y-70IND#	Match
Memory Type	Non-Volatile SRAM	Non-Volatile SRAM	✓
Memory Size	16Mbit	16Mbit	✓
Memory Organization	2M x 8	2M 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	4.5V ~ 5.5V	Compatible*
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	✓
Package Type	36-EDIP	36-EDIP	✓
Mounting Type	Through Hole	Through Hole	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Product Status	Obsolete	Active	—

*DS1270Y-70IND# supply voltage range (4.5V ~ 5.5V) encompasses the DS1270AB-70IND# range (4.75V ~ 5.25V), ensuring full compatibility in standard 5V applications.

Engineering Selection Recommendations

The DS1270Y-70IND# is the direct functional equivalent for the obsolete DS1270AB-70IND#. Selection is based on:

Identical electrical specifications and timing characteristics
Identical package footprint and through-hole mounting compatibility
Active production status ensuring availability and supply chain continuity
Equivalent RoHS3 compliance and regulatory certifications
Broader supply voltage tolerance providing enhanced operational margin

For applications currently using DS1270AB-70IND#, transition to DS1270Y-70IND# requires no circuit modifications, as all electrical and mechanical parameters are equivalent or superior.

Frequently Asked Questions (FAQ)

Q: Can DS1270Y-70IND# be used as a direct replacement for DS1270AB-70IND# without circuit modifications?

A: Yes. Both devices are electrically and mechanically identical in all critical parameters: 16Mbit capacity, 2M x 8 organization, 70 ns timing, parallel interface, and 36-EDIP package. The DS1270Y-70IND# supply voltage range is broader, making it fully compatible with existing 5V circuits.

Q: What is the primary reason for substitution?

A: DS1270AB-70IND# is classified as obsolete. DS1270Y-70IND# is the active production equivalent, ensuring long-term availability and supply chain reliability.

Q: Are the packages physically identical?

A: Yes. Both use 36-EDIP (36-pin Enhanced DIP) packaging with 0.610" (15.49mm) module dimensions. Through-hole mounting is identical, allowing direct PCB socket compatibility.

Q: Do the devices have different compliance certifications?

A: No. Both are ROHS3 compliant and carry identical REACH and ECCN classifications (3A991B2A and 8542.32.0041 respectively).

Q: Is there any performance difference between the two parts?

A: No performance difference exists. Access time, write cycle time, memory organization, and operating temperature ranges are identical. The DS1270Y-70IND# offers a slightly wider supply voltage tolerance (4.5V ~ 5.5V vs. 4.75V ~ 5.25V).

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