Analog Devices Inc. 114254-HMC548LP3

Overview

HMC548LP3 from Hittite Microwave Corporation (now part of Analog Devices) is a dual-stage SiGe HBT MMIC low-noise amplifier optimized for 1.2–3.0 GHz RF front-ends. It delivers 23 dB typical gain, 1.3 dB noise figure, and +21 dBm output IP3 at +5 V supply, with interstage access (pins 4 and 9) enabling external bandpass filtering - critical for GPS L1 (1575 MHz) receiver pre-amplification in antenna modules.

For engineers reviewing the HMC548LP3 datasheet, HMC548LP3 pinout, HMC548LP3 application, or HMC548LP3 equivalent, key selection criteria include its two-stage architecture with filter insertion capability, 3×3 mm leadless SMT package, DC-coupled input stages requiring external blocking capacitors, and validated performance across –40°C to +85°C operating range.

Technical Context

The HMC548LP3 integrates two internally matched SiGe HBT amplifier stages in a single die, with dedicated RFIN1/RFOUT1 and RFIN2/RFOUT2 signal paths separated by an accessible interstage node. This topology enables placement of an external bandpass filter (e.g., 1575 MHz GPS L1) between pins 4 (RFOUT1) and 9 (RFIN2), preserving low noise figure while rejecting out-of-band blockers.

It operates from a single +3 to +5 V supply, draws 10–21 mA depending on Vcc, and requires external bypassing (1000 pF and 18,000 pF) on Vcc (pin 15). All ground pins (2,3,5–8,10,11,13,14,16) and the exposed paddle must be soldered to RF/DC ground per RF layout best practices.

Key Specifications

Pinout & Package

Package: 3×3 mm leadless surface-mount package (MSL1, Sn/Pb finish); exposed ground paddle requires soldering to PCB RF ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise amplifier applications.

Compared with HMC548LP3E, the HMC548LP3 offers identical RF specs but uses Sn/Pb finish and lower reflow ceiling (235°C); versus QPL9057, it trades slightly higher NF for superior interstage filtering capability and higher gain-making it optimal for GPS L1 systems facing strong out-of-band interferers.

Availability

HMC548LP3 is available at Aetrix Electronics and suitable for GPS antenna modules, automotive telematics units, and location-based portable electronics requiring stable component supply and long-term obsolescence management.

Supply support for HMC548LP3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Hittite Microwave Corporation, acquired by Analog Devices in 2014, specialized in high-performance RF/microwave ICs for defense, aerospace, and communications markets.

The HMC548LP3 belongs to Hittite's SiGe HBT MMIC amplifier product line, designed specifically for high-linearity, low-noise front-end applications in GNSS, wireless infrastructure, and electronic warfare systems.

FAQ

What is the recommended external filter for HMC548LP3 in GPS L1 applications?

The HMC548LP3 datasheet specifies use of a 1.57–1.6 GHz bandpass filter (e.g., Amotech AMOBP1575P02-A1) between pins 4 (RFOUT1) and 9 (RFIN2). This filter provides ~2.5 dB insertion loss at 1575 MHz and enables effective rejection of nearby cellular and 3G signals without increasing system noise figure - a key advantage over pre-filtering approaches.

Does HMC548LP3 require external matching components?

No - the HMC548LP3 is internally matched to 50 Ω at both input and output ports across 1.2–2.0 GHz. However, external DC-blocking capacitors are required on RFIN1 (pin 1) and RFIN2 (pin 9), and bypass capacitors (1000 pF and 18,000 pF) must be placed on Vcc (pin 15) per the evaluation board layout guidelines.

What is the thermal resistance and maximum junction temperature for HMC548LP3?

The HMC548LP3 has a thermal resistance of 69 °C/W (junction to ground paddle) and a maximum junction temperature of 150 °C. At 85 °C case temperature, its continuous power dissipation is 0.942 W, derating linearly by 14 mW/°C above that point - critical for thermal design in sealed automotive enclosures.

Can HMC548LP3 operate from a +3 V supply, and how does performance change vs. +5 V?

Yes - the HMC548LP3 operates from +3 to +5 V. At +3 V, typical supply current drops to 10 mA (vs. 21 mA at +5 V), gain decreases by ~3 dB, and noise figure increases slightly (to 1.6 dB typ). The device remains fully functional across this range, enabling power-sensitive portable designs.

Is HMC548LP3 obsolete, and what is its lifecycle status?

While the original Hittite documentation marks HMC548LP3 as "OBSOLETE", Analog Devices continues to list it as active and available through authorized distributors. Aetrix Electronics maintains inventory and supports long-term supply for legacy designs, including full traceability and lifecycle coordination for industrial and automotive customers using HMC548LP3.