DS1230Y-85 NVSRAM 256Kbit Parallel Memory IC Equivalent & Substitute Parts

Part Overview

The DS1230Y-85 is a Non-Volatile SRAM (NVSRAM) memory integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. This 256Kbit parallel memory device operates with an 85 nanosecond access time and is housed in a 28-pin DIP package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for system maintenance, legacy equipment repair, and design continuity.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile SRAM (NVSRAM)
Memory Size	256Kbit
Memory Organization	32K 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	28-DIP Module (0.600", 15.24mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the DS1230Y-85 is determined by strict equivalence across the following critical parameters:

Memory Type: Non-Volatile SRAM (NVSRAM)
Memory Size: 256Kbit capacity
Memory Organization: 32K x 8 configuration
Memory Interface: Parallel interface
Supply Voltage: 4.5V ~ 5.5V range
Operating Temperature: 0°C ~ 70°C
Package Type: 28-pin DIP module with 0.600" (15.24mm) pitch
Mounting Type: Through Hole

Access time and write cycle time may vary among substitutes. Faster access times (70 ns) are backward compatible with the 85 ns specification. Package variants (28-EDIP versus 28-PCDIP) are mechanically and electrically compatible within the 28-DIP module classification.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Organization	Access Time	Write Cycle Time	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
DS1230Y-85	Analog Devices Inc./Maxim Integrated	256Kbit	32K x 8	85 ns	85 ns	4.5V ~ 5.5V	0°C ~ 70°C	28-EDIP	Obsolete	RoHS non-compliant
DS1230Y-70+	Analog Devices Inc./Maxim Integrated	256Kbit	32K x 8	70 ns	70 ns	4.5V ~ 5.5V	0°C ~ 70°C	28-EDIP	Active	ROHS3 Compliant
DS1230Y-85+	Analog Devices Inc./Maxim Integrated	256Kbit	32K x 8	85 ns	85 ns	4.5V ~ 5.5V	0°C ~ 70°C	28-EDIP	Active	ROHS3 Compliant
M48Z35Y-70PC1	STMicroelectronics	256Kbit	32K x 8	70 ns	70 ns	4.5V ~ 5.5V	0°C ~ 70°C	28-PCDIP	Active	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete DS1230Y-85, the DS1230Y-85+ is the primary equivalent. This part maintains identical electrical specifications and access time while offering active product status and ROHS3 compliance. Both parts use the 28-EDIP package variant.

The DS1230Y-70+ provides an alternative with improved performance (70 ns access time versus 85 ns) while maintaining all other electrical parameters and package compatibility. This part is suitable for applications where faster memory access is beneficial or required.

The M48Z35Y-70PC1 from STMicroelectronics is a cross-manufacturer substitute offering equivalent memory capacity, organization, and electrical specifications. The 28-PCDIP package variant is mechanically compatible with 28-DIP through-hole mounting. This part provides an alternative source for supply chain continuity.

All substitute parts maintain ROHS3 compliance and active product status, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can DS1230Y-70+ replace DS1230Y-85 in existing designs?

A: Yes. The DS1230Y-70+ is electrically and mechanically compatible. The 70 ns access time is faster than the 85 ns specification, making it a direct substitute. No circuit modifications are required.

Q: What is the difference between 28-EDIP and 28-PCDIP packages?

A: Both are 28-pin DIP modules with 0.600" (15.24mm) pitch and are mechanically compatible for through-hole mounting. The EDIP variant is used by Analog Devices; the PCDIP variant (with CAPHAT® technology) is used by STMicroelectronics. Electrical performance is equivalent.

Q: Is M48Z35Y-70PC1 a direct replacement for DS1230Y-85?

A: Yes. The M48Z35Y-70PC1 provides equivalent memory capacity, organization, interface, and electrical specifications. The cross-manufacturer design ensures supply chain alternatives while maintaining full compatibility.

Q: Why is RoHS compliance important for this substitution?

A: RoHS3 compliance ensures the substitute parts meet current environmental and regulatory standards. The original DS1230Y-85 is RoHS non-compliant, making compliant substitutes necessary for new applications and regulatory adherence.

Q: Can these parts be used interchangeably in production?

A: Yes, within the specified electrical and mechanical parameters. All substitute parts maintain identical supply voltage (4.5V ~ 5.5V), operating temperature (0°C ~ 70°C), memory organization (32K x 8), and through-hole mounting compatibility.

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