PE4312MLBA-Z RF Attenuator Equivalent & Substitute Parts

Part Overview

The PE4312MLBA-Z is an RF attenuator manufactured by pSemi, designed for fixed attenuation applications in the 0 Hz to 4 GHz frequency range. This component provides 31.5 dB attenuation with 50 Ohm impedance in a compact 20-VFQFN Exposed Pad package. The part is currently listed as Obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

PE4312MLBA-Z

pSemiIn Stock: 4964PE4312MLBA-Z Datasheet

Current PartRFQ

PE4312C-Z

pSemiIn Stock: 34239PE4312C-Z Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PE4312MLBA-Z is determined by strict alignment of the following critical parameters:

• Attenuation Value: Must be 31.5 dB
• Impedance: Must be 50 Ohms
• Package / Case: Must be 20-VFQFN Exposed Pad
• Frequency Range: Must cover or exceed the operating band

The PE4312C-Z qualifies as a direct substitute based on these criteria. Both parts share identical attenuation, impedance, and package specifications. The frequency range of the PE4312C-Z (1 MHz ~ 4 GHz) encompasses the primary operational band of the PE4312MLBA-Z, with the exception of DC to 1 MHz operation. This difference is acceptable for most RF applications where DC coupling is not required.

Parameter Comparison

Engineering Selection Recommendations

The PE4312C-Z is the qualified substitute for the obsolete PE4312MLBA-Z. Selection of the PE4312C-Z is supported by:

• Product Status: The PE4312C-Z is Active, ensuring continued availability and manufacturing support, whereas the PE4312MLBA-Z is Obsolete.
• Compliance: The PE4312C-Z carries RoHS Compliant certification, meeting modern environmental and regulatory requirements.
• Electrical Equivalence: Both parts deliver identical attenuation (31.5 dB) and impedance (50 Ohms) specifications.
• Package Compatibility: Identical 20-VFQFN Exposed Pad packaging enables direct PCB layout reuse.
• Frequency Coverage: The PE4312C-Z frequency range (1 MHz ~ 4 GHz) covers standard RF applications. Applications requiring DC to 1 MHz operation must be evaluated separately.

Frequently Asked Questions (FAQ)

Q: Can the PE4312C-Z be used as a direct replacement for the PE4312MLBA-Z?

A: Yes, the PE4312C-Z is a direct substitute. Both parts share identical attenuation (31.5 dB), impedance (50 Ohms), and package specifications (20-VFQFN Exposed Pad). The frequency range difference (1 MHz lower limit vs. DC) does not affect standard RF applications.

Q: What is the significance of the frequency range difference between these parts?

A: The PE4312MLBA-Z operates from 0 Hz (DC) to 4 GHz, while the PE4312C-Z operates from 1 MHz to 4 GHz. For applications requiring attenuation below 1 MHz or at DC, the PE4312MLBA-Z specifications must be retained. Most RF applications operate well above 1 MHz and are unaffected by this difference.

Q: Are the packages physically identical?

A: Yes. Both the PE4312MLBA-Z and PE4312C-Z use the 20-VFQFN Exposed Pad package. PCB footprints and assembly processes are identical, allowing direct component substitution without layout modifications.

Q: What is the MSL rating, and does it differ between these parts?

A: Both parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Storage and handling requirements are identical.

Q: Why is the PE4312MLBA-Z listed as Obsolete?

A: The PE4312MLBA-Z has been discontinued by the manufacturer. The PE4312C-Z is the active production equivalent and is the recommended part for new designs and ongoing support.