DS1225AB-200IND+ NVSRAM 64Kbit Parallel Memory - Equivalent & Substitute Parts

Part Overview

The DS1225AB-200IND+ is a Non-Volatile SRAM (NVSRAM) memory integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. This 64Kbit parallel memory device operates with a 200 ns access time and is housed in a 28-EDIP package. The device is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Alternative equivalent parts are available from both Analog Devices and STMicroelectronics to support design flexibility, inventory management, and performance optimization across different application requirements.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile SRAM (NVSRAM)
Memory Size	64Kbit
Memory Organization	8K 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
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the DS1225AB-200IND+ is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Type: Non-Volatile SRAM (NVSRAM)
Memory Size: 64Kbit
Memory Organization: 8K x 8
Memory Interface: Parallel
Package Type: 28-DIP Module (0.600", 15.24mm)
Mounting Type: Through Hole
RoHS Status: ROHS3 Compliant

Performance Parameters (Substitution Criteria):

Access Time: Equal to or faster than 200 ns
Write Cycle Time: Equal to or faster than 200 ns
Supply Voltage: Must encompass or be compatible with 4.75V ~ 5.25V range
Operating Temperature: Must support -40°C ~ 85°C or be suitable for the intended application temperature range

Substitute parts are grouped into two categories: direct equivalents from Analog Devices (DS1225AB series with varying access times) and manufacturer-recommended alternatives from STMicroelectronics (M48Z series with CAPHAT® packaging variant).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Organization	Access Time (ns)	Write Cycle Time (ns)	Supply Voltage	Operating Temp (°C)	Package	Inventory (Pcs)
DS1225AB-200IND+	Analog Devices Inc./Maxim Integrated	64Kbit	8K x 8	200	200	4.75V ~ 5.25V	-40 ~ 85	28-EDIP	778
DS1225AB-70IND+	Analog Devices Inc./Maxim Integrated	64Kbit	8K x 8	70	70	4.75V ~ 5.25V	-40 ~ 85	28-EDIP	2300
M48Z18-100PC1	STMicroelectronics	64Kbit	8K x 8	100	100	4.5V ~ 5.5V	0 ~ 70	28-PCDIP, CAPHAT®	1610
M48Z58-70PC1	STMicroelectronics	64Kbit	8K x 8	70	70	4.75V ~ 5.5V	0 ~ 70	28-PCDIP, CAPHAT®	3636
M48Z58Y-70PC1	STMicroelectronics	64Kbit	8K x 8	70	70	4.5V ~ 5.5V	0 ~ 70	28-PCDIP, CAPHAT®	2857

Engineering Selection Recommendations

Direct Equivalent (Same Manufacturer): The DS1225AB-70IND+ from Analog Devices Inc./Maxim Integrated is a direct equivalent with superior performance characteristics. It maintains identical memory capacity, organization, and interface specifications while offering 70 ns access and write cycle times compared to the 200 ns specification of the main part. This device supports the full -40°C ~ 85°C operating temperature range and is ROHS3 compliant. Higher inventory availability (2300 pcs) supports production continuity.

Manufacturer-Recommended Alternatives (STMicroelectronics M48Z Series): The M48Z58-70PC1 and M48Z58Y-70PC1 are manufacturer-recommended substitutes offering 70 ns performance with CAPHAT® packaging. Both devices maintain 64Kbit capacity and 8K x 8 organization with parallel interface in 28-DIP modules. The M48Z58-70PC1 operates within 4.75V ~ 5.5V supply range, while M48Z58Y-70PC1 supports 4.5V ~ 5.5V. Both are limited to 0°C ~ 70°C operating temperature, which restricts use in applications requiring the full -40°C ~ 85°C range. ROHS3 compliance is confirmed for both variants.

The M48Z18-100PC1 provides 100 ns performance as an intermediate option with 1610 pcs inventory availability and 0°C ~ 70°C operating temperature specification.

Compliance and Regulatory Status: All substitute parts maintain ROHS3 compliance, MSL 1 rating, and REACH unaffected status. ECCN classifications are EAR99 for Analog Devices variants and EAR99/3A991B2A for STMicroelectronics variants.

Frequently Asked Questions (FAQ)

Q: Can DS1225AB-70IND+ replace DS1225AB-200IND+ in all applications? A: Yes, within the specified operating parameters. The DS1225AB-70IND+ provides faster access and write cycle times (70 ns vs. 200 ns) while maintaining identical memory capacity, organization, supply voltage range (4.75V ~ 5.25V), and extended operating temperature range (-40°C ~ 85°C). No design modifications are required for direct substitution.

Q: What are the key differences between Analog Devices and STMicroelectronics NVSRAM options? A: Analog Devices DS1225AB series maintains -40°C ~ 85°C operating temperature range with 4.75V ~ 5.25V supply voltage. STMicroelectronics M48Z series operates within 0°C ~ 70°C temperature range with slightly wider supply voltage tolerance (4.5V ~ 5.5V or 4.75V ~ 5.5V depending on variant). Package designation differs: 28-EDIP for Analog Devices versus 28-PCDIP with CAPHAT® for STMicroelectronics, though both are 28-DIP modules with 0.600" (15.24mm) pitch.

Q: Are STMicroelectronics M48Z parts suitable for applications requiring -40°C operation? A: No. M48Z series devices are specified for 0°C ~ 70°C operating temperature. Applications requiring -40°C ~ 85°C operation must use Analog Devices DS1225AB series variants.

Q: What is the significance of CAPHAT® packaging in M48Z devices? A: CAPHAT® is a STMicroelectronics packaging variant for the 28-PCDIP module. It maintains the same 28-DIP footprint (0.600", 15.24mm) and through-hole mounting compatibility as standard 28-DIP packages. The designation indicates specific internal construction but does not affect electrical interface or pin compatibility.

Q: Can I use M48Z18-100PC1 as a substitute for DS1225AB-200IND+? A: M48Z18-100PC1 meets the core memory specifications (64Kbit, 8K x 8, parallel interface, 28-DIP package) and provides faster access time (100 ns vs. 200 ns). However, it is limited to 0°C ~ 70°C operating temperature and 4.5V ~ 5.5V supply voltage. Use only in applications where these narrower specifications are acceptable.

Q: What inventory considerations should guide part selection? A: DS1225AB-70IND+ offers the highest inventory (2300 pcs) among Analog Devices variants. M48Z58-70PC1 provides the largest STMicroelectronics inventory (3636 pcs). Selection should balance performance requirements, temperature range specifications, and supply chain availability.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the regulatory status of the DS1225AB-200IND+.

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