Analog Devices Inc. 107780-HMC322LP4

Overview

HMC322LP4 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC SP8T non-reflective RF switch operating from DC to 8 GHz, delivering 2.4 dB typical insertion loss and >30 dB isolation at 6 GHz with integrated 3:8 TTL decoder logic. It uses -5 V fixed bias and 0/–5 V negative control voltage, and is designed for 50-Ω or 75-Ω systems in broadband signal routing applications.

For engineers reviewing the HMC322LP4 datasheet, HMC322LP4 pinout, HMC322LP4 application, or HMC322LP4 equivalent, key selection criteria include its SP8T non-reflective architecture, 24-pin 4×4 mm QFN package, DC–8 GHz bandwidth, -5 V bias requirement, and integrated binary decoder reducing control lines to three.

Technical Context

The HMC322LP4 implements a GaAs MESFET-based SP8T switch topology with on-die non-reflective termination in all off-states, enabling broadband impedance matching across DC–8 GHz. Its internal 3:8 decoder accepts TTL-compatible A/B/C inputs to select one of eight RF paths between RFC and RF1–RF8.

Control interface operates with negative logic: high state = –5 V to –4.2 V, low state = –3 V to 0 V; VEE must be –5 V ±10% and is supplied at Pin 8. All RF ports are DC-coupled 50-Ω matched interfaces requiring external blocking capacitors if DC bias is present.

Key Specifications

Pinout & Package

Package: 24-lead, 4 mm × 4 mm, leadless QFN with exposed metal thermal paddle (must be soldered to PCB RF ground). RoHS-compliant Sn finish, MSL1 rating, max reflow 235 °C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SP8T RF switch applications.

Compared with HMC322LP4E, the HMC322LP4 offers identical RF performance but uses Sn/Pb finish and 235 °C reflow; versus QM11036, it delivers wider bandwidth and integrated decoding at the cost of negative control voltage-critical for legacy test equipment and high-isolation broadband systems.

Availability

HMC322LP4 is available at Aetrix Electronics and suitable for broadband test instrumentation, fiber-optic transceiver modules, switched filter banks, and sub-8 GHz wireless infrastructure requiring stable component supply and long-term obsolescence management.

Supply support for HMC322LP4 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 maintains its high-frequency RF portfolio, specializing in GaAs, GaN, and SiGe MMIC solutions for defense, communications, and instrumentation markets.

The HMC322LP4 belongs to Hittite's broadband non-reflective switch product line, engineered for applications demanding wideband signal routing without impedance discontinuities or external termination components.

FAQ

What is the control voltage logic scheme used by the HMC322LP4?

The HMC322LP4 uses negative TTL-compatible logic: high state is –5 V to –4.2 V (drawing ~5 µA), low state is –3 V to 0 V (drawing ~25 µA). Control inputs A/B/C (Pins 11/10/9) drive an on-chip 3:8 decoder, eliminating need for external logic. The HMC322LP4 requires VEE = –5 V ±10% at Pin 8 to operate both switch core and decoder.

Does the HMC322LP4 require external DC-blocking capacitors on its RF ports?

Yes, all RF ports (RFC, RF1–RF8) are DC-coupled and internally matched to 50 Ω. If any connected RF line carries DC bias-such as from an amplifier output or mixer port-external DC-blocking capacitors must be placed in series. The HMC322LP4 datasheet specifies use of 0402 100 pF capacitors on evaluation board 107780, confirming this design requirement for the HMC322LP4.

What is the thermal management requirement for the HMC322LP4?

The HMC322LP4 has a thermal resistance of 187 °C/W and maximum channel temperature of 150 °C. Its exposed metal paddle (Pins 1,3,5,7,12,14,16,18,21,23 and bottom slug) must be soldered to a large PCB ground plane with multiple vias. At 85 °C ambient, max continuous dissipation is 0.348 W; derating is 5.34 mW/°C above that. Proper thermal design is essential for reliability in the HMC322LP4.

Can the HMC322LP4 be used in 75-Ohm video or CATV systems?

Yes-the HMC322LP4 is explicitly characterized and qualified for use in both 50-Ω and 75-Ω systems per its General Description. While insertion loss and isolation specs are published for 50-Ω test conditions, the non-reflective architecture and internal 75-Ω termination option (per Hittite app note AN-11-01) ensure stable VSWR in 75-Ω environments. System validation is recommended, but the HMC322LP4 supports dual-impedance deployment.

What is the ESD sensitivity classification of the HMC322LP4?

The HMC322LP4 is classified as Class 1B per HBM (Human Body Model), with ESD withstand capability of 200–500 V. It carries the "ELECTROSTATIC SENSITIVE DEVICE" marking and requires standard ESD handling: grounded workstations, ionized air, and conductive packaging. This rating applies specifically to the HMC322LP4 and is documented in its Absolute Maximum Ratings table.