DS21FF44 Equivalent & Substitute Parts

Part Overview

The DS21FF44 is a telecom interface IC manufactured by Analog Devices Inc./Maxim Integrated, designed for telecommunications applications in a 300-PBGA (27x27) package. This component operates at supply voltages between 2.97V and 3.63V with a maximum supply current of 300mA, supporting parallel and serial interface configurations across an operating temperature range of 0°C to 70°C.

The DS21FF44 is classified as obsolete. Due to its discontinued status and limited availability for new designs, identifying functionally equivalent substitute components is essential for system continuity, design updates, and long-term supply chain planning.

Substiute Parts

DS21FF44

Analog Devices Inc./Maxim IntegratedIn Stock: 2300DS21FF44 Datasheet

Current PartRFQ

DS26518GN+

Analog Devices Inc./Maxim IntegratedIn Stock: 2247DS26518GN+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The DS26518GN+ is identified as the manufacturer-recommended substitute for the DS21FF44. The substitution logic is based on the following criteria:

Functional Compatibility:

• Both components are interface ICs from the same manufacturer (Analog Devices Inc./Maxim Integrated)
• Both support telecommunications protocols and serial/parallel interface configurations
• Both are surface-mount BGA packages designed for high-density interconnect applications

Electrical Compatibility:

• Supply voltage ranges overlap within acceptable operating margins (DS21FF44: 2.97V–3.63V; DS26518GN+: 3.135V–3.465V)
• Both components operate within compatible voltage domains for 3.3V systems
• Current consumption profiles are suitable for equivalent power delivery architectures

Mechanical Compatibility:

• Both utilize BGA packaging technology with comparable pin densities and footprint considerations
• Surface-mount mounting type is identical

Compliance Considerations:

• DS26518GN+ is RoHS3 compliant and active in production, addressing obsolescence and regulatory requirements
• DS26518GN+ has improved moisture sensitivity rating (MSL 3 vs. MSL 4)

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The DS21FF44 is obsolete and no longer in active production. The DS26518GN+ is an active product with ongoing manufacturer support and availability, making it the appropriate choice for new designs and system updates.

Compliance and Certification: The DS26518GN+ meets RoHS3 compliance requirements, whereas the DS21FF44 is RoHS non-compliant. For applications subject to environmental and regulatory standards, the DS26518GN+ provides compliance assurance. Both components are REACH Unaffected and classified under ECCN EAR99.

Reliability and Handling: The DS26518GN+ features an improved moisture sensitivity level (MSL 3 with 168-hour tolerance) compared to the DS21FF44 (MSL 4 with 72-hour tolerance), providing enhanced reliability during storage and handling.

Operating Temperature Range: The DS26518GN+ supports an extended operating temperature range (-40°C to 85°C) compared to the DS21FF44 (0°C to 70°C), offering greater flexibility for diverse application environments.

Frequently Asked Questions (FAQ)

Q: Can the DS26518GN+ directly replace the DS21FF44 in existing designs?

A: The DS26518GN+ is the manufacturer-recommended substitute. However, design verification is required due to differences in package size (300-PBGA vs. 256-CSBGA), pin count, and functional specifications. PCB layout modifications and firmware updates may be necessary.

Q: What are the key differences in package specifications?

A: The DS21FF44 uses a 300-PBGA (27x27) package, while the DS26518GN+ uses a 256-CSBGA (17x17) package. The substitute has a smaller footprint and reduced pin count, requiring PCB redesign and updated schematic documentation.

Q: Are there voltage compatibility concerns?

A: Both components operate within 3.3V supply domains. The DS26518GN+ has a narrower voltage range (3.135V–3.465V) compared to the DS21FF44 (2.97V–3.63V). Verify that your power supply regulation meets the tighter tolerance requirements of the substitute.

Q: What is the significance of the RoHS compliance difference?

A: The DS21FF44 is RoHS non-compliant, while the DS26518GN+ is RoHS3 compliant. For applications in regulated markets or with environmental requirements, the DS26518GN+ is the appropriate selection.

Q: How do the moisture sensitivity levels affect component handling?

A: The DS21FF44 (MSL 4) requires reflow within 72 hours of bag opening, while the DS26518GN+ (MSL 3) allows 168 hours. The substitute provides extended handling flexibility and reduced risk of moisture-induced failures during assembly.

Q: Is the extended operating temperature range of the DS26518GN+ a requirement for substitution?

A: The extended range (-40°C to 85°C vs. 0°C to 70°C) is an additional benefit but not a substitution requirement. If your application operates within 0°C to 70°C, both components are functionally suitable within their respective temperature specifications.