Analog Devices Inc. HMC596LP4

Overview

HMC596LP4 from Analog Devices (formerly Hittite Microwave) is a surface-mount 4×2 RF switch matrix IC designed for high-isolation signal routing in satellite LNBs and multiswitches. It operates from 0.2 to 3.0 GHz, delivers ≤7.5 dB insertion loss (typ. 6–8 dB), ≥37 dB isolation (up to 50 dB), and supports 50 Ω or 75 Ω systems with integrated CMOS-compatible 4-bit decoder. Its primary role is bidirectional RF path selection between four inputs (VL, HL, VH, HH) and two outputs (OP1, OP2).

For engineers reviewing the HMC596LP4 datasheet, HMC596LP4 pinout, HMC596LP4 application, or HMC596LP4 equivalent, key selection criteria include its 24-lead 4×4 mm QFN package, +5 V single-supply operation, 6.5 ns switching speed, and verified performance in DBS/CATV front-end switching where low intermodulation and thermal stability across −40°C to +85°C are critical.

Technical Context

The HMC596LP4 implements a fully decoded 4×2 matrix architecture using internal CMOS logic to drive RF FET switches, enabling independent or simultaneous selection of any input to OP1 and OP2. Its bidirectional design allows flexible I/O assignment without signal direction constraints.

All RF ports are DC-coupled and require external 330 pF DC-blocking capacitors; Vdd is decoupled with a 1000 pF capacitor. Control inputs (HV1, HV2, Tone1, Tone2) accept 0–0.8 V (low) and 2–5 V (high) logic levels, with <0.5 µA leakage, and operate at +5 V ±10% supply.

Key Specifications

Pinout & Package

Package: 24-lead leadless QFN, 4×4 mm body, 0.5 mm pitch, exposed ground paddle. RoHS-compliant variant HMC596LP4E uses matte Sn finish; standard HMC596LP4 uses Sn/Pb.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC596LP4, HMC598LP4 trades 0.5 GHz bandwidth and marginal isolation for legacy compatibility in narrower-band systems, while QM11035 delivers superior RF specs at the cost of control interface compatibility and supply complexity-making HMC596LP4 the optimal balance for DBS/CATV designs requiring integrated decoding and 50/75 Ω flexibility.

Availability

HMC596LP4 is available at Aetrix Electronics and suitable for DBS LNBs, CATV multiswitches, and cellular diversity receivers requiring stable component supply, consistent RF performance across temperature, and long-term obsolescence management.

Supply support for HMC596LP4 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 product portfolio, including broadband switches, LNAs, and MMICs for communications infrastructure.

The HMC596LP4 belongs to Hittite's legacy SMT CMOS switch matrix family, engineered specifically for cost-sensitive, high-volume satellite and broadband distribution systems demanding integrated control and wideband RF performance.

FAQ

What is the maximum RF input power rating for the HMC596LP4?

The HMC596LP4 is rated for +23 dBm maximum input power across 200–2150 MHz. This limit ensures reliable operation without compression or damage under continuous wave conditions at +25°C ambient. Derating is required above +25°C per the device's thermal resistance of 325 °C/W; the HMC596LP4 must be mounted with full ground paddle soldering to maintain safe junction temperature.

Does the HMC596LP4 support 75 Ω impedance systems, and how is matching achieved?

Yes, the HMC596LP4 is explicitly characterized and qualified for both 50 Ω and 75 Ω systems. Matching is achieved through internal switch topology and layout optimization-not external components. When used in 75 Ω applications like DBS LNBs, no impedance transformation is needed; the HMC596LP4 maintains specified insertion loss and isolation without modification.

Can the HMC596LP4 be used to build a 4×4 switch matrix, and what design considerations apply?

Yes, two HMC596LP4 devices can be interconnected to form a 4×4 matrix by tying their VL, HL, VH, and HH inputs together with 62.5 Ω characteristic-impedance traces. The resulting parallel input impedance becomes 31.25 Ω, requiring external matching. Each output must be terminated in 75 Ω, and external amplifiers are recommended on OP1/OP2 to provide output-to-output isolation not inherent in the HMC596LP4.

What DC blocking capacitor value is recommended for the HMC596LP4 RF ports?

A 330 pF, 0402-size capacitor is the validated value used in all HMC596LP4 characterization, supporting operation down to 200 MHz. For applications extending below 200 MHz, capacitor value must be increased inversely with lowest frequency (e.g., 1000 pF for 50 MHz). All six RF ports-VL, HL, VH, HH, OP1, OP2-require identical DC blocking.

Is the HMC596LP4 pin-compatible with the HMC596LP4E, and what is the key difference?

Yes, the HMC596LP4 and HMC596LP4E share identical pinout, footprint, electrical specifications, and functionality. The sole difference is RoHS compliance: HMC596LP4E uses 100% matte tin lead finish and supports peak reflow up to 260°C, whereas the standard HMC596LP4 uses Sn/Pb and max reflow of 235°C. Both are MSL1 rated and interchangeable in layout.