RF Switch IC 4244-52 Equivalent & Substitute Parts

Part Overview

The pSemi 4244-52 is a general-purpose RF switch IC with SPDT (Single Pole Double Throw) topology, designed for reflective switching applications up to 3 GHz. This component operates across the 2.7V to 3.3V supply range and is housed in an 8-MSOP surface mount package. The 4244-52 is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

4244-52

pSemiIn Stock: 7894244-52 Datasheet

Current PartRFQ

PE4250MLI-Z

pSemiIn Stock: 2978PE4250MLI-Z Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 4244-52 is determined by strict alignment across the following critical parameters:

Circuit topology must remain SPDT with reflective switching architecture. The 50 Ohm impedance specification is mandatory for RF path compatibility. Operating temperature range must encompass or match the -40°C to 85°C requirement. Package form factor must be 8-MSOP to ensure PCB layout compatibility without redesign. Supply voltage compatibility requires overlap with the 2.7V to 3.3V range of the original part.

Performance parameters including isolation, insertion loss, P1dB, and IIP3 establish the baseline performance envelope. Substitute parts may exceed these specifications without functional penalty. Frequency range must support operation within the 0 Hz to 3 GHz band.

Parameter Comparison

Engineering Selection Recommendations

The PE4250MLI-Z qualifies as a direct substitute for the 4244-52 based on matching circuit topology, package form factor, impedance specification, and operating temperature range. The PE4250MLI-Z holds active product status, ensuring continued availability and manufacturing support.

The PE4250MLI-Z demonstrates improved performance across isolation (40 dB vs. 29 dB), P1dB (30.5 dBm vs. 27 dBm), and IIP3 (59 dBm vs. 45 dBm). Insertion loss increases marginally from 0.6 dB to 0.75 dB. The frequency range lower limit shifts from 0 Hz to 10 MHz, which is acceptable for most general-purpose RF switching applications.

Supply voltage compatibility requires attention: the 4244-52 operates at 2.7V to 3.3V, while the PE4250MLI-Z supports 3V to 3.6V or 4.5V to 5.5V. The 3V to 3.6V range provides overlap at the upper boundary of the original specification. Circuit design must confirm voltage regulator output falls within the compatible range.

The PE4250MLI-Z carries RoHS Compliant certification, providing environmental compliance advantage over the 4244-52.

Frequently Asked Questions (FAQ)

Q: Can the PE4250MLI-Z replace the 4244-52 in existing designs without PCB modification?

A: Yes. Both parts use identical 8-MSOP package geometry (0.118", 3.00mm width), enabling direct footprint compatibility without layout changes.

Q: What is the impact of the 10 MHz lower frequency limit on the PE4250MLI-Z compared to the 4244-52?

A: The 4244-52 specifies operation from 0 Hz, while the PE4250MLI-Z begins at 10 MHz. For DC or very low-frequency switching applications, this difference is relevant. Most RF switching applications operate well above 10 MHz and are unaffected.

Q: Are there supply voltage compatibility concerns?

A: The 4244-52 requires 2.7V to 3.3V. The PE4250MLI-Z accepts 3V to 3.6V or 4.5V to 5.5V. If the existing power supply delivers 2.7V to 3.0V, the PE4250MLI-Z may not operate reliably. Confirm the actual supply voltage in the application before substitution.

Q: Does the increased insertion loss of the PE4250MLI-Z affect system performance?

A: Insertion loss increases from 0.6 dB to 0.75 dB, a 0.15 dB difference. For most RF systems, this margin is within acceptable tolerance. High-sensitivity receiver applications should evaluate the cumulative impact on noise figure.

Q: What control interface differences exist between these parts?

A: The 4244-52 features single line control. The PE4250MLI-Z supports single or dual line control with DC blocking. Existing single-line control circuits remain compatible with the PE4250MLI-Z.

Q: Is the PE4250MLI-Z available in the same packaging format?

A: The PE4250MLI-Z is supplied in Tape & Reel (TR) format, while the 4244-52 packaging format is not specified in the provided data. Both use the 8-MSOP package case. Confirm tape & reel compatibility with assembly processes if required.