RF Attenuator 4302-51 Equivalent & Substitute Parts

Part Overview

The 4302-51 is an RF attenuator manufactured by pSemi, designed for fixed attenuation applications across DC to 4 GHz frequency range with 50 Ohm impedance. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The 31.5 dB attenuation value and 20-pin QFN package define the core functional and mechanical requirements for equivalent component selection.

Substiute Parts

4302-51

pSemiIn Stock: 7154302-51 Datasheet

Current PartRFQ

PE4312C-Z

pSemiIn Stock: 34239PE4312C-Z Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 4302-51 is determined by matching the following critical parameters:

• Attenuation Value: 31.5 dB (exact match required)
• Impedance: 50 Ohms (exact match required)
• Frequency Range: Minimum coverage of 0 Hz to 4 GHz operational band
• Package Compatibility: 20-pin QFN form factor with exposed pad for thermal management
• Moisture Sensitivity: MSL 1 or better for unlimited shelf life

The PE4312C-Z meets these substitution criteria with compatible electrical specifications and package footprint, though with a modified frequency range floor of 1 MHz instead of DC.

Parameter Comparison

Engineering Selection Recommendations

The PE4312C-Z serves as the active production equivalent for the obsolete 4302-51. Both components are manufactured by pSemi and maintain identical attenuation and impedance specifications. The PE4312C-Z is RoHS compliant and currently in active production with substantial inventory availability (34,200 units), ensuring supply chain continuity.

The primary difference between these parts is the frequency range floor: the PE4312C-Z operates from 1 MHz minimum, whereas the 4302-51 operates from DC (0 Hz). For applications requiring DC or sub-1 MHz attenuation performance, the frequency range difference must be evaluated against system requirements. Both components share compatible 20-pin QFN package footprints with exposed pads and identical MSL ratings.

Frequently Asked Questions (FAQ)

Q: Can PE4312C-Z directly replace 4302-51 in existing designs?

A: PE4312C-Z is electrically and mechanically compatible for most applications. The package footprints (20-WFQFN vs. 20-VFQFN) are both 20-pin QFN with exposed pads and share the same pin configuration. Verify that your application does not require attenuation performance below 1 MHz, as this is the lower frequency limit of the PE4312C-Z.

Q: What is the significance of the frequency range difference?

A: The 4302-51 specifies 0 Hz to 4 GHz operation, while PE4312C-Z specifies 1 MHz to 4 GHz. If your circuit requires attenuation at DC or frequencies below 1 MHz, the PE4312C-Z may not meet performance specifications in that band. Confirm your application's minimum frequency requirement before substitution.

Q: Are there any compliance differences between these parts?

A: PE4312C-Z is explicitly RoHS compliant. The 4302-51 RoHS status is not specified in available documentation. Both components carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Q: What is the package compatibility between 20-WFQFN and 20-VFQFN?

A: Both designations refer to 20-pin QFN packages with exposed pads. The letter suffix (W vs. V) indicates minor manufacturing or specification variations by pSemi. Pin configuration and footprint dimensions are compatible for PCB layout purposes. Consult the respective datasheets for exact dimensional specifications if precision placement is critical.

Q: Why is the 4302-51 obsolete?

A: The 4302-51 has been superseded by the PE4312C-Z in pSemi's product portfolio. The PE4312C-Z provides equivalent functionality with active production status and RoHS compliance, making it the recommended choice for new designs and ongoing support.