DS1245W-150 NVSRAM Equivalent & Substitute Parts

Part Overview

The DS1245W-150 is a 1Mbit Non-Volatile SRAM (NVSRAM) memory IC manufactured by Analog Devices Inc./Maxim Integrated. This parallel interface memory device operates with a 150 ns access time and write cycle time, organized as 128K x 8 bits in a 32-EDIP package. The main part number DS1245W-150 is currently classified as obsolete, making substitute parts necessary for ongoing system support and new designs requiring equivalent functionality.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile SRAM (NVSRAM)
Memory Size	1Mbit
Memory Organization	128K x 8
Memory Interface	Parallel
Access Time	150 ns
Write Cycle Time	150 ns
Supply Voltage	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C
Package Type	32-DIP Module (0.600", 15.24mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the DS1245W-150 is determined by the following critical parameters that must remain constant or be compatible:

Fixed Parameters (Must Match):

Memory Type: Non-Volatile SRAM (NVSRAM)
Memory Size: 1Mbit
Memory Organization: 128K x 8
Memory Interface: Parallel
Supply Voltage: 3V ~ 3.6V
Operating Temperature: 0°C ~ 70°C
Package Type: 32-DIP Module (0.600", 15.24mm)
Mounting Type: Through Hole

Variable Parameters (Substitution Allowed):

Access Time: Can be equal or faster (≤150 ns)
Write Cycle Time: Can be equal or faster (≤150 ns)
Product Status: Active variants are preferred over obsolete
RoHS Compliance: Active variants offer improved compliance status

The DS1245W-150 has two identified substitutes: DS1245W-100+ and DS1245W-150+. Both maintain identical core memory specifications while offering improved timing performance or compliance characteristics.

Parameter Comparison

Parameter	DS1245W-150	DS1245W-100+	DS1245W-150+
Memory Type	NVSRAM	NVSRAM	NVSRAM
Memory Size	1Mbit	1Mbit	1Mbit
Memory Organization	128K x 8	128K x 8	128K x 8
Memory Interface	Parallel	Parallel	Parallel
Access Time	150 ns	100 ns	150 ns
Write Cycle Time	150 ns	100 ns	150 ns
Supply Voltage	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package Type	32-DIP Module (0.600", 15.24mm)	32-DIP Module (0.600", 15.24mm)	32-DIP Module (0.600", 15.24mm)
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Not specified	Tube	Tube

Engineering Selection Recommendations

DS1245W-100+ is the optimal substitute when system timing margins permit. This variant offers faster access and write cycle times (100 ns versus 150 ns), providing improved performance headroom. It carries Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

DS1245W-150+ is the direct functional equivalent when timing specifications require exact 150 ns performance. This variant maintains identical electrical and timing characteristics to the original DS1245W-150 while providing Active product status and ROHS3 compliance. This part is suitable for direct replacement in existing designs.

Both substitute parts eliminate the obsolescence risk associated with the original DS1245W-150 and provide improved compliance certifications. Selection between DS1245W-100+ and DS1245W-150+ depends solely on whether the application can accommodate faster memory access times.

Frequently Asked Questions (FAQ)

Q: Can DS1245W-100+ be used as a direct replacement for DS1245W-150?

A: Yes. The DS1245W-100+ is electrically and mechanically compatible. It provides identical memory capacity, organization, interface, voltage, temperature range, and package configuration. The faster access time (100 ns) is a performance enhancement that does not create compatibility issues in applications designed for 150 ns operation.

Q: What is the difference between DS1245W-150+ and DS1245W-150?

A: Both parts have identical electrical specifications and timing characteristics (150 ns access and write cycle times). The primary differences are product status (Active versus Obsolete) and RoHS compliance (ROHS3 Compliant versus non-compliant). The DS1245W-150+ is the active production equivalent.

Q: Are all three parts pin-compatible?

A: Yes. DS1245W-150, DS1245W-100+, and DS1245W-150+ share the same 32-DIP package configuration (0.600", 15.24mm) with identical through-hole mounting. No PCB modifications are required for substitution.

Q: Does faster access time affect system compatibility?

A: No. Faster memory access times are backward compatible. Systems designed for 150 ns operation will function correctly with 100 ns memory. The faster device does not introduce timing violations in applications with 150 ns or slower timing requirements.

Q: What is the supply voltage requirement for all substitute parts?

A: All three parts operate within the identical 3V to 3.6V supply voltage range. No power supply modifications are necessary when substituting between these parts.

Q: Are there inventory considerations for these substitutes?

A: DS1245W-150 (obsolete) has 2300 pcs in stock. DS1245W-100+ has 2224 pcs available. DS1245W-150+ has 813 pcs available. All parts are listed as new original stock.

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