AMCOM AM254038WM-FM-R: RF Specifications, Datasheet & RFQ

The AMCOM AM254038WM-FM-R is a two-stage GaAs HiFET pHEMT MMIC power amplifier designed for broadband RF applications from 2.4GHz to 4.4GHz. It delivers 18dB typical small-signal gain, 38dBm typical output power at the 1dB compression point (P1dB), and 39dBm typical saturated output power under the manufacturer's specified test conditions.

The device incorporates 50-ohm matched RF input and output networks and is supplied in a ceramic package mounted on a gold-plated copper flange. Its mechanical construction supports attachment to an external metal heat sink.

This guide reviews the AM254038WM-FM-R datasheet specifications, RF performance, pinout, bias requirements, thermal management, applications and purchasing considerations.

1. AM254038WM-FM-R Overview

Manufactured by AMCOM Communications, the AM254038WM-FM-R belongs to the company's GaAs HiFET MMIC power amplifier family. Its two-stage pHEMT architecture is designed to provide broadband RF amplification with relatively high output power.

The amplifier is intended for applications requiring operation across portions of the 2.4–4.4GHz frequency range. Typical test-board performance is characterized primarily over 2.5–4.0GHz, with some minimum specifications given over a narrower frequency range.

Key Features

• Frequency coverage: 2.4–4.4GHz application range.

• RF gain: 18dB typical small-signal gain.

• Output power: 38dBm typical P1dB.

• 39dBm typical saturated output power.

• 50-ohm matched RF input and output.

• Gold-plated copper flange for mechanical mounting and heat transfer.

• RoHS-compliant construction.

2. AM254038WM-FM-R RF Specifications

The following specifications are taken from AMCOM Communications' AM254038WM-BM/EM/FM-R datasheet, Revision 1, July 2019.

Test conditions: VDD = +12V, VGS approximately -0.92V, IDQ = 1300mA and ambient temperature = 25°C. Actual gate voltage must be adjusted to establish the specified quiescent current and may vary between production lots.

Important: The 38dBm P1dB and 39dBm Psat figures are typical values under specified conditions. They should not be interpreted as guaranteed output power across the entire application frequency range.

3. RF Performance: Gain, P1dB and Psat

3.1 Small-Signal Gain

The AM254038WM-FM-R provides approximately 18dB typical small-signal gain under the manufacturer's test conditions.

Small-signal gain describes the amplifier's ability to increase RF signal power while operating in the approximately linear region.

For example, if an RF input signal is -10dBm and the amplifier provides 18dB gain, the theoretical output level is:

Pout = Pin + Gain = -10dBm + 18dB = +8dBm

This is an illustrative calculation. Actual gain depends on frequency, bias and operating conditions.

3.2 P1dB Output Power

The amplifier specifies a typical output P1dB of 38dBm, equivalent to approximately 6.3W.

P1dB represents the output power at which the amplifier's gain has decreased by 1dB relative to its small-signal gain characteristic.

For modulated RF signals, engineers should not use P1dB as the automatic operating output power. The required output back-off depends on modulation format, linearity, spectral-mask requirements and system performance targets.

3.3 Saturated Output Power

The typical saturated output power is 39dBm, corresponding to approximately 7.9W.

Psat indicates operation near the amplifier's saturated power region and is not equivalent to a guaranteed linear output power rating.

3.4 Efficiency and Linearity

The manufacturer specifies approximately 30% typical efficiency at P1dB and 45dBm typical third-order intercept performance.

These characteristics are relevant when evaluating output-power requirements, nonlinear distortion and system power dissipation.

Consult the manufacturer-supplied performance curves when selecting the device for a specific operating frequency.

4. AM254038WM-FM-R Pinout and Bias Requirements

The AM254038WM-FM-R uses separate bias connections for its amplifier stages. Correct bias sequencing is essential for safe operation.

Pin Configuration

Critical bias warning: Do not apply VDD1 or VDD2 without establishing the appropriate negative gate bias at VGS1 and VGS2.

The approximate -0.92V gate voltage is a typical test condition rather than a fixed universal operating setting. Adjust the gate bias to achieve the required quiescent drain current according to the manufacturer's instructions.

Bias Design Considerations

• Establish the negative gate bias before applying the positive drain supply.

• Control individual stage drain currents during initial power-up.

• Use appropriate power-supply decoupling.

• Prevent drain voltage from being applied during an unexpected gate-bias failure.

• Verify bias sequencing and device temperature before applying high RF drive levels.

For nominal test conditions, the manufacturer's datasheet indicates approximately 300mA first-stage and 1000mA second-stage quiescent drain currents.

Refer to the official test circuit for recommended bias and decoupling arrangements.

5. FM Package and Thermal Management

The FM version of the AM254038WM family uses a ceramic MMIC mounted on a gold-plated copper flange carrier.

The flange provides a mechanical mounting interface and a thermal conduction path to a suitable metal heat sink.

Why Is Heat Sinking Important?

RF power amplifiers dissipate electrical power as heat. Thermal performance depends on drain voltage, supply current, RF drive, output power and the thermal interface between the device and heat sink.

AMCOM specifies a typical thermal resistance of 5°C/W for the device.

High device temperatures can reduce reliability and affect RF operating characteristics.

FM Package Mounting Recommendations

• Mount the flange to an appropriate metal heat sink.

• Use the manufacturer's mechanical outline drawing to determine mounting dimensions.

• Ensure good contact between the flange and heat-sink surface.

• Verify thermal-interface material compatibility where used.

• Avoid excessive mechanical stress on package leads.

• Check maximum device temperature under continuous RF operation.

The flange includes two mounting holes for attachment to a metal heat sink.

For PCB-only surface mounting, consult AMCOM application note AN700 and the applicable derating instructions. Do not assume that the normal flange-mounted operating conditions apply to a PCB-only assembly.

6. AM254038WM-FM-R vs BM-R vs EM-R

AMCOM offers the AM254038WM amplifier in several package configurations.

The FM-R version is based on the BM-R device mounted on a gold-plated copper flange carrier. The EM-R version uses a copper/tungsten flange and straight leads.

Replacement consideration: Although these package variants belong to the same amplifier family, they should not be treated as automatic mechanical replacements.

Verify lead configuration, mounting dimensions, heat-sink attachment and electrical performance before substituting one package variant for another.

7. Typical Applications

7.1 Wireless Communication Systems

The amplifier may be considered for RF transmit applications operating within its supported frequency range. Designers should verify power, gain, linearity and thermal requirements for their particular communication architecture.

7.2 RF and Microwave Laboratory Testing

The device can be evaluated for laboratory RF amplification and equipment development where the available gain and output-power characteristics match system requirements.

7.3 WLAN Repeaters and RF Subsystems

AMCOM lists WLAN repeaters among the intended applications. Actual suitability depends on the operating channel, spectral requirements and RF output linearity.

7.4 MMDS and Broadband RF Equipment

The broadband RF performance and flange-mounted construction make the device a candidate for selected microwave transmission and test equipment applications.

Application suitability should always be confirmed against the datasheet curves and system-level operating requirements.

8. How to Select a 2.4–4.4GHz RF Power Amplifier

When choosing the AM254038WM-FM-R or evaluating another RF power amplifier, consider the following factors:

A replacement with similar gain and output power may still require changes to the bias circuit, PCB layout or cooling system.

9. AM254038WM-FM-R Datasheet

The official AMCOM datasheet provides detailed RF performance curves, package outlines, pin assignments and application test circuits.

Document: AM254038WM-BM-R / AM254038WM-EM-R / AM254038WM-FM-R, Rev. 1, July 2019.

View AM254038WM-FM-R Datasheet (PDF)

Before production use, confirm whether a newer datasheet revision or additional application documentation is available from AMCOM.

10. AMCOM AM254038WM-FM-R Price, Availability and RFQ

If you are sourcing the AMCOM AM254038WM-FM-R GaAs MMIC power amplifier for a prototype, replacement project or production requirement, DataStorageIC can assist with a quotation and availability inquiry.

Please provide the following information:

• Manufacturer: AMCOM Communications

• Part Number: AM254038WM-FM-R

• Required quantity

• Estimated annual demand, if applicable

• Target price

• Required delivery date

• Destination country or region

• Documentation and packaging requirements

For replacement projects, please specify the exact existing package configuration. BM-R, EM-R and FM-R versions may require different mechanical and thermal arrangements.

Request AM254038WM-FM-R Pricing: Visit DataStorageIC and submit your requirements through the website inquiry form.

Availability, pricing and delivery time are subject to confirmation.

11. Related AMCOM Products and Technical Articles

• AMCOM In-Stock Products – Browse additional AMCOM RF amplifier models and submit sourcing inquiries.

• AMCOM GaN MMIC Power Amplifier Selection Guide – Explore alternative amplifier technologies and power levels.

• DataStorageIC RF & Microwave Components – Explore RF and microwave component sourcing options.

Conclusion

The AMCOM AM254038WM-FM-R is a broadband, two-stage GaAs MMIC power amplifier with 2.4–4.4GHz application coverage, 18dB typical gain and 38dBm typical P1dB output power.

Its flange-mounted package supports direct attachment to a heat sink, while the integrated 50-ohm RF matching simplifies system-level RF interconnection.

Engineers should pay particular attention to negative gate-bias sequencing, operating frequency, device temperature and package compatibility.

For AM254038WM-FM-R datasheets, technical sourcing inquiries and RFQ support, contact DataStorageIC with your required quantity and delivery schedule.