RF Switch IC pSemi 4283-52 Equivalent & Substitute Parts

Part Overview

The pSemi 4283-52 is a general-purpose RF switch IC with SPDT (Single Pole Double Throw) topology, designed for applications requiring RF signal routing up to 4 GHz. This component operates at 50 Ohm impedance with single or dual line control capability. The part is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	4283-52
Manufacturer	pSemi
Series	UltraCMOS®
Product Status	Obsolete
Circuit Configuration	SPDT
Frequency Range	0 Hz ~ 4 GHz
Impedance	50 Ohm
Isolation	22 dB
Insertion Loss	0.7 dB
Supply Voltage	2 V ~ 3.3 V
Package Type	SC-70-6 (6-TSSOP)
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the pSemi 4283-52 is determined by the following critical parameters:

Circuit Topology: SPDT configuration required for equivalent signal routing capability
Package Compatibility: SC-70-6 (6-TSSOP) form factor for PCB layout compatibility
Impedance: 50 Ohm characteristic impedance for RF signal integrity
Operating Temperature Range: -40°C ~ 85°C for thermal environment compatibility
Supply Voltage Range: Overlap within 2 V ~ 3.3 V window for power supply compatibility
Mounting Type: Surface mount technology for assembly process alignment

The pSemi 4259-63 meets all substitution criteria as an active product within the same UltraCMOS® series, maintaining identical package specifications and compatible electrical operating ranges.

Parameter Comparison

Parameter	4283-52 (Main Part)	4259-63 (Substitute)	Compatibility Notes
Manufacturer	pSemi	pSemi	Same manufacturer
Series	UltraCMOS®	UltraCMOS®	Same product series
Circuit Configuration	SPDT	SPDT	Identical topology
Frequency Range	0 Hz ~ 4 GHz	10 MHz ~ 3 GHz	Substitute covers lower frequency band; suitable for applications ≤ 3 GHz
Impedance	50 Ohm	50 Ohm	Identical impedance
Isolation	22 dB	20 dB	Substitute provides 2 dB lower isolation
Insertion Loss	0.7 dB	0.5 dB	Substitute provides 0.2 dB lower insertion loss
Supply Voltage	2 V ~ 3.3 V	1.8 V ~ 3.3 V	Substitute supports lower minimum voltage; compatible within 2 V ~ 3.3 V overlap
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Identical temperature range
Package Type	SC-70-6 (6-TSSOP)	SC-70-6 (6-TSSOP)	Identical package; direct PCB replacement
Product Status	Obsolete	Active	Substitute is actively manufactured and supported

Engineering Selection Recommendations

The pSemi 4259-63 is the qualified substitute for the obsolete pSemi 4283-52 based on the following engineering criteria:

Functional Compatibility: Both components maintain identical SPDT topology, 50 Ohm impedance, and SC-70-6 package specifications, enabling direct PCB-level replacement without layout modifications.

Electrical Operating Range: The 4259-63 operates within the required supply voltage window (1.8 V ~ 3.3 V encompasses the original 2 V ~ 3.3 V specification) and maintains the same -40°C ~ 85°C temperature range.

Performance Trade-offs: The substitute exhibits improved insertion loss (0.5 dB vs. 0.7 dB) and slightly reduced isolation (20 dB vs. 22 dB). These differences are within typical RF switch performance variation and acceptable for general-purpose applications operating at frequencies up to 3 GHz.

Product Status and Supply: The 4259-63 is an active product with established supply chain availability (4400 Pcs in stock), providing long-term component sourcing security compared to the obsolete 4283-52.

Compliance: The 4259-63 carries RoHS3 compliance and REACH Unaffected status, meeting current regulatory requirements for new designs and manufacturing.

Frequently Asked Questions (FAQ)

Q: Can the pSemi 4259-63 directly replace the 4283-52 on existing PCBs?

A: Yes. Both components use identical SC-70-6 package specifications and pin configurations, enabling direct PCB replacement without layout modifications or rework.

Q: What is the frequency limitation when using the 4259-63 as a substitute?

A: The 4259-63 operates across 10 MHz ~ 3 GHz, compared to the original 4283-52 range of 0 Hz ~ 4 GHz. Applications requiring operation above 3 GHz must evaluate alternative components, as the substitute does not support the full upper frequency band of the original part.

Q: Are there supply voltage compatibility concerns?

A: No. The 4259-63 supply voltage range (1.8 V ~ 3.3 V) encompasses the original specification window (2 V ~ 3.3 V). Systems operating within 2 V ~ 3.3 V experience no voltage-related compatibility issues.

Q: How do the RF performance characteristics compare?

A: The 4259-63 provides superior insertion loss (0.5 dB vs. 0.7 dB) but slightly lower isolation (20 dB vs. 22 dB). For general-purpose RF switching applications, these performance differences are within acceptable engineering tolerances.

Q: Is the 4259-63 suitable for new product designs?

A: Yes. The 4259-63 is an active product with established manufacturing support, RoHS3 compliance, and REACH Unaffected status, making it appropriate for new designs requiring general-purpose SPDT RF switching functionality up to 3 GHz.

Q: What packaging options are available for the 4259-63?

A: The 4259-63 is supplied in Cut Tape (CT) and Digi-Reel® packaging formats, with Moisture Sensitivity Level 1 (Unlimited), indicating no moisture bake-out requirements prior to assembly.

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