DS1220AD-100 NVSRAM 16Kbit Parallel Memory IC Equivalent & Substitute Parts

Part Overview

The DS1220AD-100 is a Non-Volatile SRAM (NVSRAM) memory integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. This 16Kbit parallel memory device combines SRAM speed with non-volatile storage capability, organized as 2K x 8 bits with a 100 ns access time. The component is mounted in a 24-EDIP through-hole package and operates across a 4.5V to 5.5V supply voltage range at temperatures from 0°C to 70°C.

The DS1220AD-100 is classified as obsolete. Equivalent and substitute parts are necessary to maintain system functionality in legacy applications, ensure continued component availability, and support design updates where active production alternatives are preferred.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile SRAM (NVSRAM)
Memory Size	16Kbit
Memory Organization	2K x 8
Memory Interface	Parallel
Access Time	100 ns
Write Cycle Time	100 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	24-DIP Module (0.600", 15.24mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the DS1220AD-100 is determined by strict equivalence across the following critical parameters:

Memory Type: Must be Non-Volatile SRAM (NVSRAM)
Memory Size: Must be 16Kbit
Memory Organization: Must be 2K x 8
Memory Interface: Must be Parallel
Voltage Supply Range: Must be 4.5V ~ 5.5V
Operating Temperature: Must be 0°C ~ 70°C
Package Type: Must be 24-DIP Module (0.600", 15.24mm)
Mounting Type: Must be Through Hole

Access time and write cycle time may vary within acceptable ranges for the same functional class. Package designations (EDIP, PCDIP) represent different supplier implementations of the same 24-DIP footprint and pinout.

Parameter Comparison

Parameter	DS1220AD-100	DS1220AD-100+	M48Z12-70PC1
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	STMicroelectronics
Memory Type	NVSRAM	NVSRAM	NVSRAM
Memory Size	16Kbit	16Kbit	16Kbit
Memory Organization	2K x 8	2K x 8	2K x 8
Memory Interface	Parallel	Parallel	Parallel
Access Time	100 ns	100 ns	70 ns
Write Cycle Time	100 ns	100 ns	70 ns
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package Type	24-DIP Module	24-DIP Module	24-DIP Module
Supplier Device Package	24-EDIP	24-EDIP	24-PCDIP, CAPHAT®
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

DS1220AD-100+ (Direct Equivalent)

The DS1220AD-100+ is the direct functional equivalent manufactured by the same supplier (Analog Devices Inc./Maxim Integrated). It maintains identical electrical specifications and pinout while offering active product status and ROHS3 compliance. This part is the primary substitute for obsolete DS1220AD-100 applications requiring no design modification.

M48Z12-70PC1 (Performance-Enhanced Alternative)

The M48Z12-70PC1 manufactured by STMicroelectronics meets all functional and electrical requirements with improved access and write cycle times (70 ns versus 100 ns). This part is electrically compatible and pin-compatible, with active product status and ROHS3 compliance. The faster timing specification provides performance headroom in timing-critical applications. The CAPHAT® package designation indicates a different physical implementation of the 24-DIP footprint; mechanical fit verification is required before board-level substitution.

Both substitute parts are ROHS3 compliant and REACH unaffected, addressing regulatory requirements for the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can DS1220AD-100+ be used as a direct replacement for DS1220AD-100?

A: Yes. The DS1220AD-100+ is electrically and functionally identical to the DS1220AD-100, with identical access time, write cycle time, voltage supply range, and operating temperature specifications. Both use the 24-DIP footprint. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant).

Q: What is the difference between DS1220AD-100 and M48Z12-70PC1?

A: Both are 16Kbit NVSRAM devices with 2K x 8 organization and parallel interface, operating at 4.5V to 5.5V across 0°C to 70°C. The M48Z12-70PC1 has faster access and write cycle times (70 ns versus 100 ns). The M48Z12-70PC1 uses a 24-PCDIP package with CAPHAT® designation, while the DS1220AD-100 uses 24-EDIP. Both mount in 24-DIP through-hole footprints with identical pinouts.

Q: Are there package compatibility concerns when substituting M48Z12-70PC1?

A: Both the 24-EDIP and 24-PCDIP packages conform to the 24-DIP Module standard (0.600", 15.24mm). The CAPHAT® designation on the M48Z12-70PC1 indicates a specific physical implementation. Mechanical fit verification is required to confirm compatibility with existing through-hole PCB layouts, particularly regarding lead spacing and body dimensions.

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

A: Selection depends on timing requirements and compliance needs. For applications matching the original 100 ns specification, DS1220AD-100+ provides direct equivalence with active status and ROHS3 compliance. For applications tolerating or benefiting from faster timing, M48Z12-70PC1 offers improved performance with equivalent electrical compatibility.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both DS1220AD-100+ and M48Z12-70PC1 are ROHS3 compliant. The original DS1220AD-100 is RoHS non-compliant. Compliance status should be verified against specific application and regional regulatory requirements.

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