XR-D2B4-0404D Gives LEE-29+ a Practical RF Evaluation Platform

ElecSuppliers Part Number GuideAug 25, 2026

XR-D2B4-0404D Is Not the Amplifier Itself

Searching for XR-D2B4-0404D can be confusing if the part number is treated like an ordinary RF IC.

It is actually a development platform associated with the LEE-29+ RF amplifier. The purpose is different from buying the amplifier as a standalone component.

Instead of spending the early stages of a project building a complete evaluation circuit around an RF device, an RF development module provides a more convenient starting point for testing the device inside a controlled hardware environment.

That makes the XR-D2B4-0404D more relevant to RF engineers working on evaluation and prototyping than to someone simply looking for an amplifier IC.

Why RF Evaluation Hardware Can Save Development Time

RF circuits are particularly sensitive to layout.

At GHz frequencies, the PCB traces, grounding structure, connectors and surrounding components all become part of the electrical design.

A theoretically correct schematic can therefore behave differently once it is assembled on a real PCB.

An evaluation platform helps engineers separate two questions:

Does the RF device perform as expected?

and

Is my own PCB design causing the problem?

That distinction can save considerable time during the early stages of development.

XR-D2B4-0404D and the LEE-29+ Connection

The XR-D2B4-0404D is part of the X-Microwave D2B4 development platform family and is associated with the LEE-29+ amplifier.

The LEE-29+ is a broadband RF gain block, so the evaluation platform is useful when engineers want to examine its behavior before incorporating the amplifier into a custom RF board.

This approach is especially practical for engineers evaluating:

• RF gain stages

• Receiver signal paths

• Broadband amplification

• Microwave circuits

• RF test equipment

A Useful Tool Before Designing the Final PCB

An evaluation board should not automatically be considered the final product design.

Its real value is during the decision-making stage.

An engineer may first want to determine whether the amplifier provides enough gain, whether the noise performance fits the application, or how the device behaves across the intended frequency range.

Once those questions are answered, the engineer can move toward a custom PCB.

This workflow is often much more efficient than designing the entire RF section before knowing whether the selected amplifier is appropriate.

Modular RF Development Has Another Advantage

RF development often involves testing several different components.

A modular platform makes it easier to approach the signal chain as individual functional blocks rather than treating the entire RF system as one large circuit.

For prototype development, this can make experiments easier to organize.

One amplifier can be evaluated in one configuration, then compared with another device or another signal-chain arrangement without redesigning an entire board from scratch.

What to Check Before Using XR-D2B4-0404D

The most important point is to understand what the module is intended to evaluate.

Because the XR-D2B4-0404D is associated with the LEE-29+, engineers should begin with the requirements of the actual RF application rather than treating the evaluation module as a generic amplifier board.

Frequency range, gain, noise figure, linearity, power supply requirements and signal levels all need to be considered together.

The module can demonstrate the behavior of the selected RF building block, but the final product will still require its own PCB layout and system-level validation.

XR-D2B4-0404D for RF Prototyping and Evaluation

The XR-D2B4-0404D is best understood as a development tool for engineers who need to evaluate the LEE-29+ in an RF design environment.

Its value comes from reducing the amount of initial RF hardware work required before testing can begin.

For broadband amplifier evaluation, prototype signal chains and microwave development, that can make the transition from component selection to practical testing considerably more efficient.