Many legacy Hittite Microwave RF amplifiers, now part of Analog Devices, have reached obsolete or discontinued status. These devices remain important for repair, legacy production, microwave modules and long-life communication systems where redesigning the RF chain may be costly.

Popular obsolete models include HMC375LP3E, HMC382LP3E, HMC549MS8GE, HMC-APH460 and HMC906, covering applications from cellular LNAs to Ka-band power amplifiers.

DataStorageIC supports RFQs for obsolete and hard-to-find ADI / Hittite RF amplifiers. Stock, date code and availability should be confirmed at the time of quotation.

Popular Obsolete ADI / Hittite RF Amplifiers

HMC375LP3E — 1.7–2.2GHz High-Linearity LNA

The HMC375LP3E is a GaAs pHEMT MMIC low noise amplifier developed for cellular base-station receiver front ends.

Key specifications include:

1.7GHz to 2.2GHz

17dB gain

0.9dB noise figure

Up to +34dBm output IP3

+5V / 136mA supply

3mm × 3mm QFN package

Its combination of low noise and high linearity made it suitable for GSM, GPRS, EDGE, CDMA and W-CDMA infrastructure.

ADI currently lists HMC375LP3E as Obsolete.

Best suited for: legacy receiver designs requiring low NF and high OIP3.

HMC382LP3E— Adjustable-Bias 1.7–2.2GHz LNA

The HMC382LP3E covers the same 1.7–2.2GHz band as HMC375LP3E but offers an externally adjustable supply current.

Key specifications:

1.7GHz to 2.2GHz

17dB gain

1.0dB noise figure

+30dBm OIP3

+5V supply

Adjustable bias current

50Ω matched input and output

This makes HMC382LP3E useful when designers need to balance RF linearity against power consumption.

Best suited for: base stations, repeaters and legacy 3G infrastructure.

HMC375LP3E vs HMC382LP3E

For legacy sourcing:

HMC375LP3E → better NF and higher OIP3

HMC382LP3E → lower and adjustable current consumption

They should not automatically be treated as direct replacements because biasing and RF matching requirements differ.

HMC549MS8GE— 40–960MHz Dual-Output LNA

The HMC549MS8GE is a broadband dual-output GaAs pHEMT LNA designed for CATV and television receiver applications.

Key features include:

40MHz to 960MHz

3.5dB noise figure

+27dBm OIP3

+5V / 120mA

75Ω input

Balanced dual RF outputs

The two RF outputs can drive a differential tuner or operate as an active splitter feeding two single-ended tuner inputs.

Typical applications include:

DTV receivers

CATV equipment

Multi-tuner set-top boxes

PVRs

Home gateways

ADI lists HMC549MS8GE and HMC549MS8GETR as Obsolete.

ADI also lists HMC374G as a suggested replacement, but PCB and RF compatibility should be checked before substitution.

HMC-APH460 — 27–31.5GHz 0.5W Power Amplifier

The HMC-APH460 is a two-stage GaAs HEMT MMIC power amplifier aimed at Ka-band microwave systems.

Important specifications include:

27GHz to 31.5GHz

14dB gain

+28dBm P1dB

+37dBm OIP3

0.5W class output

+5V supply

50Ω matched input/output

Bare-die construction

Typical applications include:

Point-to-point radio

Point-to-multipoint radio

VSAT

Microwave modules

Military and space systems

ADI currently identifies HMC-APH460 as an obsolete device.

HMC-APH460 Replacement

ADI's PDN lists:ADPA7006CHIP

as a replacement option, but specifically indicates that it is not pin-to-pin compatible.

This means a redesign may be required for:

Die layout

Wire bonding

Bias circuitry

RF matching

Thermal design

HMC906 — 27.3–33.5GHz 2W Power Amplifier

The HMC906 is one of the higher-power obsolete Hittite Ka-band amplifiers.

Key specifications include:

27.3GHz to 33.5GHz

2W class output

23dB gain

Approximately +34dBm saturated output power

+43dBm OIP3

GaAs pHEMT MMIC technology

Bare-die package

ADI currently lists HMC906 and HMC906-SX as Obsolete.

The original Hittite EOL notice stated that the product was discontinued because of loss of supply chain and confirmed there was no drop-in replacement.

HMC906 Replacement

Hittite recommended evaluating:

HMC7441

The HMC7441 offers similar 2W-class performance but covers 27.5–31GHz, so it cannot automatically replace HMC906 in systems requiring operation above 31GHz.

FAQ

Is Hittite Microwave still a separate manufacturer?

Hittite Microwave was acquired by Analog Devices, and many legacy HMC products are now supported through Analog Devices documentation and lifecycle records.

Are HMC375LP3E and HMC382LP3E discontinued?

Yes. ADI currently lists both as Obsolete, and both were included in PDN 20_0057.

Is HMC549MS8GE obsolete?

Yes. HMC549MS8GE and HMC549MS8GETR are currently listed as Obsolete.

Is HMC-APH460 discontinued?

Yes. HMC-APH460 was included in ADI PDN 20_0057 and is currently listed as an obsolete product.

Is HMC906 obsolete?

Yes. ADI currently identifies HMC906 as Obsolete.

What is the replacement for HMC906?

Hittite recommended evaluating HMC7441, but stated that there is no drop-in replacement for HMC906.

Where can I request obsolete Hittite RF amplifier stock?

DataStorageIC supports RFQs for obsolete ADI / Hittite RF components. Submit the exact part number and required quantity for availability, price and lead-time confirmation.