DS21FF42+ Equivalent & Substitute Parts

Part Overview

The DS21FF42+ is a telecom interface IC manufactured by Analog Devices Inc./Maxim Integrated, designed for telecommunications applications requiring parallel/serial interface functionality. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The original 300-PBGA (27x27) package configuration serves specific form factor requirements in legacy telecom equipment.

Substiute Parts

DS21FF42+

Analog Devices Inc./Maxim IntegratedIn Stock: 869DS21FF42+ Datasheet

Current PartRFQ

DS26518GN+

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS21FF42+ is determined by the following critical parameters:

• Manufacturer Alignment: Both main and substitute parts originate from Analog Devices Inc./Maxim Integrated, ensuring design continuity and technical support consistency.
• Functional Category: Both components operate within the Interface category, maintaining functional equivalence for telecom applications.
• Interface Protocol: The substitute maintains parallel/serial interface capability required for system integration.
• Voltage Supply Compatibility: Operating voltage ranges must overlap or be compatible with existing power delivery infrastructure.
• Compliance Standards: RoHS3 compliance and REACH unaffected status ensure regulatory alignment across both components.
• Thermal Operating Range: Temperature specifications must support the intended deployment environment.

The DS26518GN+ qualifies as a manufacturer-recommended substitute based on these parameters, despite differences in package configuration and product status.

Parameter Comparison

Engineering Selection Recommendations

The DS26518GN+ is the manufacturer-recommended substitute for the obsolete DS21FF42+. Selection of this substitute is supported by the following factors:

• Active Product Status: The DS26518GN+ maintains active production status, ensuring long-term availability and technical support from Analog Devices Inc./Maxim Integrated.
• Regulatory Compliance: Both components maintain ROHS3 compliance and REACH unaffected status, satisfying current environmental and regulatory requirements.
• Manufacturer Continuity: Direct manufacturer recommendation ensures design validation and compatibility assurance.
• Enhanced Operating Range: The DS26518GN+ provides extended operating temperature range (-40°C ~ 85°C) compared to the original part (0°C ~ 70°C), supporting broader deployment scenarios.
• Improved Moisture Handling: MSL rating of 3 (168 Hours) provides superior moisture sensitivity performance relative to the original MSL 4 (72 Hours) specification.

Frequently Asked Questions (FAQ)

Q: Why is the DS21FF42+ classified as obsolete? A: The DS21FF42+ has reached end-of-life status within Analog Devices Inc./Maxim Integrated's product portfolio. Substitute parts are necessary for system maintenance and new design implementations.

Q: What are the key differences between the DS21FF42+ and DS26518GN+? A: Primary differences include package configuration (300-PBGA versus 256-CSBGA), product status (obsolete versus active), operating temperature range, and functional specialization (general interface versus T1/E1/J1 transceiver). Voltage supply ranges overlap within compatible margins.

Q: Is the DS26518GN+ a direct pin-for-pin replacement? A: No. The DS26518GN+ uses a different package configuration (256-CSBGA 17x17 versus 300-PBGA 27x27). PCB layout redesign is required for implementation.

Q: Can the DS26518GN+ operate within the original power supply specifications? A: The DS26518GN+ voltage supply range (3.135V ~ 3.465V) overlaps with the DS21FF42+ range (2.97V ~ 3.63V). Verify that existing power delivery infrastructure operates within the overlapping range of 3.135V ~ 3.63V.

Q: What is the significance of the MSL rating difference? A: The DS26518GN+ MSL 3 (168 Hours) rating indicates superior moisture resistance compared to the DS21FF42+ MSL 4 (72 Hours). This provides extended handling and storage flexibility during manufacturing and assembly processes.

Q: Are both components RoHS compliant? A: Yes. Both the DS21FF42+ and DS26518GN+ maintain ROHS3 compliance and REACH unaffected status, satisfying current environmental regulations.