Analog Devices Inc. HMC424LP3ETR

Overview

HMC424LP3ETR from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC 6-bit digital attenuator IC for RF signal conditioning in microwave and broadband systems. It delivers 0.5 dB LSB steps across 31.5 dB range, DC–13 GHz bandwidth, ±0.5 dB typical bit error, 3.8 dB typical insertion loss at 4 GHz, and +32 dBm IIP3 - enabling precise gain control in fiber-optic transceivers and VSAT radios.

For engineers reviewing the HMC424LP3ETR datasheet, HMC424LP3ETR pinout, HMC424LP3ETR application, or HMC424LP3ETR equivalent, key selection criteria include attenuation accuracy over frequency, DC-coupled 50 Ω RF ports, -5 V single-bias operation, and RoHS-compliant 9 mm² leadless SMT package compatibility with high-frequency PCB layout requirements.

Technical Context

The HMC424LP3ETR implements a fully integrated GaAs-based 6-bit switched-attenuator architecture with independent TTL/CMOS-compatible control lines (V1–V6), each toggling between 0 V and -5 V to select discrete 0.5/1/2/4/8/16 dB bits. Its monolithic design enables DC-coupled operation without external blocking capacitors on RF paths when DC bias permits.

All six attenuation bits are simultaneously active, with worst-case step error bounded by ±(0.3 + 3% of setting) up to 15.5 dB and ±(0.3 + 5% of setting) beyond - verified across DC–13 GHz. The device draws only 2 mA typical supply current from VEE = -5 V ±10%, supporting low-power RF subsystems requiring stable attenuation under thermal variation (-55°C to +85°C).

Key Specifications

Pinout & Package

Package: 16-lead 3×3 mm leadless plastic QFN (RoHS-compliant matte Sn finish, MSL1, exposed paddle). Ground paddle must be soldered to PCB RF ground per Hittite land pattern guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital RF attenuator applications.

Compared with HMC424LP3ETR, HMC1084LP3E offers finer resolution and wider bandwidth at increased size and cost, while QM11036 trades IIP3 and supply simplicity for 3.3 V logic compatibility - making HMC424LP3ETR optimal for cost-sensitive, space-constrained DC–13 GHz designs needing single-supply operation.

Availability

HMC424LP3ETR is available at Aetrix Electronics and suitable for fiber-optic transceivers, VSAT outdoor units, and 5G active antenna units requiring stable component supply, consistent RoHS-compliant packaging, and guaranteed long-term availability for industrial and telecom deployments.

Supply support for HMC424LP3ETR 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

Analog Devices acquired Hittite Microwave in 2014 and integrates its high-frequency RF portfolio into precision RF signal chain solutions for communications and defense markets.

The HMC424LP3ETR belongs to Hittite's legacy GaAs MMIC digital attenuator product line, engineered specifically for broadband wireless infrastructure and instrumentation demanding DC-coupled, low-error, single-supply RF attenuation.

FAQ

What is the operating temperature range for the HMC424LP3ETR?

The HMC424LP3ETR operates reliably from -55°C to +85°C ambient. This full industrial temperature range is validated across all electrical specifications including insertion loss, return loss, and bit error - ensuring consistent performance in outdoor base station enclosures and aerospace-grade test equipment where thermal cycling occurs.

Does the HMC424LP3ETR require external blocking capacitors on its RF ports?

No, the HMC424LP3ETR features DC-coupled RF ports (RFIN and RFOUT), so external blocking capacitors are not required unless the connected circuit imposes non-zero DC potential on the RF line. When DC bias is present, external AC coupling remains necessary to prevent damage or distortion - confirmed in the official Hittite application note AN-00-001.

What is the maximum RF input power the HMC424LP3ETR can handle?

The HMC424LP3ETR supports +22 dBm input power for 0.1 dB compression across 1–13 GHz, with absolute maximum rating of +25 dBm. This headroom enables robust operation in transmitter output stages and automated test equipment where transient peaks exceed average power levels - provided thermal management meets the 330 °C/W spec.

How does the HMC424LP3ETR achieve its ±0.5 dB typical bit error specification?

The HMC424LP3ETR achieves ±0.5 dB typical bit error through monolithic GaAs process matching and on-chip resistor ladder calibration during wafer sort. Each bit's attenuation value (0.5/1/2/4/8/16 dB) is trimmed to minimize unit-to-unit variation, and the error remains bounded across temperature and frequency per the datasheet's "Bit Error vs. Frequency" and "Bit Error vs. Attenuation State" plots.

Is the HMC424LP3ETR pin-compatible with the non-RoHS HMC424LP3 variant?

Yes, the HMC424LP3ETR is pin-, package-, and function-compatible with the legacy HMC424LP3. Both share identical 16-pin 3×3 mm QFN outline, pin functions, electrical specs, and land pattern - differing only in RoHS compliance (matte Sn vs. Sn/Pb finish) and peak reflow temperature (260°C vs. 235°C), as documented in the official Hittite package bulletin PB-00-042.