DS1230AB-200IND NVSRAM 256Kbit Parallel Memory - Equivalent & Substitute Parts

Part Overview

The DS1230AB-200IND is a Non-Volatile SRAM (NVSRAM) memory integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. This 256Kbit parallel memory device operates with a 200 ns access time and is housed in a 28-EDIP package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance, repair, and legacy equipment support. Substitute parts must maintain identical memory capacity, organization, interface type, and physical package compatibility while meeting modern compliance standards.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile SRAM (NVSRAM)
Memory Size	256Kbit
Memory Organization	32K x 8
Memory Interface	Parallel
Access Time	200 ns
Write Cycle Time	200 ns
Supply Voltage	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Package Type	28-DIP Module (0.600", 15.24mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the DS1230AB-200IND is determined by the following critical parameters:

Memory Specifications: All substitute parts must provide 256Kbit capacity in 32K x 8 organization with parallel interface to ensure direct functional replacement without circuit redesign.

Package Compatibility: Physical package must be 28-DIP Module (0.600", 15.24mm) with through-hole mounting to maintain PCB compatibility and socket interchangeability.

Electrical Compatibility: Supply voltage range and operating temperature must encompass or match the original specification to ensure reliable operation within the target application environment.

Performance Consideration: Access time and write cycle time may be equal to or faster than the original 200 ns specification. Faster devices are functionally compatible as they meet or exceed performance requirements.

Substitute parts identified are DS1230AB-70IND+ (Analog Devices Inc./Maxim Integrated), M48Z35-70PC1 (STMicroelectronics), and M48Z35Y-70PC1 (STMicroelectronics). All three parts meet the core substitution criteria of identical memory capacity, organization, interface, and package type.

Parameter Comparison

Parameter	DS1230AB-200IND (Original)	DS1230AB-70IND+	M48Z35-70PC1	M48Z35Y-70PC1
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	STMicroelectronics	STMicroelectronics
Memory Size	256Kbit	256Kbit	256Kbit	256Kbit
Memory Organization	32K x 8	32K x 8	32K x 8	32K x 8
Memory Interface	Parallel	Parallel	Parallel	Parallel
Access Time	200 ns	70 ns	70 ns	70 ns
Write Cycle Time	200 ns	70 ns	70 ns	70 ns
Supply Voltage	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C
Package Type	28-EDIP	28-EDIP	28-PCDIP, CAPHAT®	28-PCDIP, CAPHAT®
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

DS1230AB-70IND+ is the primary substitute when maintaining manufacturer continuity with Analog Devices Inc./Maxim Integrated is required. This part is manufactured by the same supplier as the original, maintains identical electrical specifications (4.75V ~ 5.25V supply, -40°C ~ 85°C operating range), and provides superior performance with 70 ns access time. The part is ROHS3 compliant and currently in active production status, ensuring long-term availability and supply chain stability.

M48Z35-70PC1 and M48Z35Y-70PC1 are STMicroelectronics alternatives suitable for applications where cross-manufacturer substitution is acceptable. Both parts provide identical memory capacity and organization with 70 ns performance. M48Z35Y-70PC1 offers the widest supply voltage range (4.5V ~ 5.5V), providing enhanced tolerance for voltage variations. Both STMicroelectronics parts are ROHS3 compliant and actively produced. Operating temperature range is reduced to 0°C ~ 70°C compared to the original -40°C ~ 85°C specification; verification against application requirements is necessary for extended temperature environments.

Selection should prioritize DS1230AB-70IND+ for direct replacement in temperature-critical applications requiring -40°C operation. STMicroelectronics alternatives are suitable for standard industrial temperature ranges (0°C ~ 70°C).

Frequently Asked Questions (FAQ)

Q: Can DS1230AB-70IND+ directly replace DS1230AB-200IND without circuit modification?

A: Yes. DS1230AB-70IND+ maintains identical memory capacity (256Kbit, 32K x 8), parallel interface, supply voltage range (4.75V ~ 5.25V), operating temperature range (-40°C ~ 85°C), and 28-EDIP package. The 70 ns access time exceeds the original 200 ns specification, providing improved performance without functional incompatibility.

Q: What is the key difference between DS1230AB-70IND+ and the STMicroelectronics M48Z35 series?

A: Both provide identical memory specifications and 70 ns performance. The primary differences are manufacturer (Analog Devices vs. STMicroelectronics) and package designation (28-EDIP vs. 28-PCDIP with CAPHAT®). Operating temperature range differs: DS1230AB-70IND+ supports -40°C ~ 85°C, while M48Z35 series supports 0°C ~ 70°C. Verify application temperature requirements before selecting STMicroelectronics alternatives.

Q: Are M48Z35-70PC1 and M48Z35Y-70PC1 interchangeable?

A: Both parts are functionally equivalent with identical memory specifications and 70 ns performance. M48Z35Y-70PC1 provides a wider supply voltage range (4.5V ~ 5.5V) compared to M48Z35-70PC1 (4.75V ~ 5.5V). Selection depends on application voltage tolerance requirements. Both are ROHS3 compliant and actively produced.

Q: Why is operating temperature range important for substitution?

A: The original DS1230AB-200IND operates from -40°C ~ 85°C, supporting extended industrial and military temperature environments. STMicroelectronics alternatives (M48Z35 series) operate from 0°C ~ 70°C, suitable for standard commercial and industrial applications. Applications requiring operation below 0°C or above 70°C must use DS1230AB-70IND+ to maintain specification compliance.

Q: Is RoHS compliance a substitution requirement?

A: The original DS1230AB-200IND is RoHS non-compliant. All active substitute parts (DS1230AB-70IND+, M48Z35-70PC1, M48Z35Y-70PC1) are ROHS3 compliant. For new designs or systems requiring RoHS compliance, substitute parts provide regulatory alignment. For legacy system repair, RoHS compliance is not a functional requirement but represents environmental and regulatory improvement.

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