pSemi 4273-52 RF Switch SPDT 3GHz SC70-6 Equivalent & Substitute Parts

Part Overview

The pSemi 4273-52 is an RF Switch IC with Single Pole Double Throw (SPDT) topology designed for CATV applications operating across the 5MHz to 3GHz frequency range. This component features 75Ohm impedance, 25dB isolation, and 0.65dB insertion loss at 2GHz test frequency. The device is classified as Obsolete, necessitating identification of functionally compatible alternatives for ongoing system support and new designs requiring equivalent performance characteristics.

Substiute Parts

4273-52

pSemiIn Stock: 11094273-52 Datasheet

Current PartRFQ

4259-63

pSemiIn Stock: 44974259-63 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the pSemi 4273-52 is determined by the following critical parameters:

Circuit Configuration: Both the main part and substitute must maintain SPDT topology to preserve switching functionality.

Package Compatibility: The SC-70-6 package (6-TSSOP, SC-88, SOT-363) must be maintained for PCB layout compatibility and assembly process continuity.

Frequency Range Overlap: The substitute must support operation within the 5MHz to 3GHz band required by CATV applications.

Impedance Matching: The 75Ohm impedance specification is application-specific for CATV systems and represents a critical electrical parameter.

Operating Temperature Range: The -40°C to 85°C specification must be met or exceeded.

Supply Voltage Compatibility: The substitute supply voltage range must encompass or overlap with the 2.7V to 3.3V requirement.

Surface Mount Capability: The substitute must be available in surface mount configuration for manufacturing compatibility.

The pSemi 4259-63 qualifies as a substitute based on matching circuit topology, package form factor, frequency range overlap, operating temperature range, and surface mount configuration. However, impedance and RF type differences require engineering evaluation for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The pSemi 4259-63 is available as an Active product with ROHS3 compliance and REACH Unaffected status, providing regulatory advantage over the Obsolete 4273-52 with undefined compliance status.

Substitution feasibility depends on application-specific impedance requirements. The 4273-52 operates at 75Ohm impedance for CATV systems, while the 4259-63 operates at 50Ohm impedance for general purpose applications. Direct substitution requires impedance matching network redesign or confirmation that the system can operate at 50Ohm impedance.

The 4259-63 demonstrates superior insertion loss (0.5dB versus 0.65dB) and higher IIP3 (55dBm versus 53dBm minimum), while providing lower isolation (20dB versus 25dB). The lower frequency limit of the 4259-63 (10MHz versus 5MHz) may restrict operation in extended low-frequency CATV applications.

Both devices maintain identical operating temperature range (-40°C to 85°C) and package configuration (SC-70-6). The 4259-63 supply voltage range (1.8V to 3.3V) encompasses the 4273-52 requirement (2.7V to 3.3V), providing broader operational flexibility.

Frequently Asked Questions (FAQ)

Q: Can the pSemi 4259-63 directly replace the 4273-52 in existing CATV applications?

A: Direct replacement requires impedance verification. The 4273-52 is specified for 75Ohm CATV systems, while the 4259-63 is specified for 50Ohm general purpose applications. System redesign or impedance matching network implementation may be necessary.

Q: What is the minimum frequency difference between these parts?

A: The 4273-52 operates from 5MHz, while the 4259-63 operates from 10MHz. Applications requiring operation below 10MHz cannot use the 4259-63 as a substitute.

Q: Are both parts available in the same package?

A: Yes. Both the 4273-52 and 4259-63 are supplied in SC-70-6 package (6-TSSOP, SC-88, SOT-363) configuration, maintaining identical PCB footprint and assembly compatibility.

Q: What compliance advantages does the 4259-63 offer?

A: The 4259-63 is ROHS3 Compliant and REACH Unaffected, compared to the 4273-52 with Vendor Undefined compliance status. This provides regulatory advantage for new designs and systems subject to environmental compliance requirements.

Q: How do the isolation specifications compare?

A: The 4273-52 provides 25dB isolation at 2GHz, while the 4259-63 provides 20dB isolation. Applications requiring higher isolation should verify that 20dB meets system requirements before substitution.

Q: Is the supply voltage range compatible?

A: The 4259-63 supply range (1.8V to 3.3V) encompasses the 4273-52 requirement (2.7V to 3.3V). The 4259-63 can operate at lower supply voltages, providing design flexibility.

Q: What is the product status difference?

A: The 4273-52 is classified as Obsolete with limited availability, while the 4259-63 is Active with ongoing production and supply assurance. The 4259-63 is recommended for new designs requiring long-term component availability.