Analog Devices Inc. HMC557ALC4TR-R5

Overview

HMC557ALC4TR-R5 from Analog Devices is a GaAs MMIC fundamental double-balanced mixer operating from 2.5 GHz to 7.0 GHz, delivering 8 dB typical conversion loss, 50 dB LO-to-RF isolation, and 18 dBm input IP3. It functions as an upconverter or downconverter in RF front-ends for point-to-point radios and test instrumentation.

For engineers reviewing the HMC557ALC4TR-R5 datasheet, HMC557ALC4TR-R5 pinout, HMC557ALC4TR-R5 application, or HMC557ALC4TR-R5 equivalent, key selection criteria include its 24-terminal ceramic leadless chip carrier package, dc–3 GHz IF bandwidth, passive topology requiring no external matching, and performance across temperature (−40°C to +85°C) and LO drive (9–17 dBm).

Technical Context

The HMC557ALC4TR-R5 implements a passive double-balanced topology using GaAs MESFETs, enabling wideband operation without biasing or external components. Its optimized balun structures deliver high LO-to-RF (≥40 dB) and LO-to-IF (≥25 dB) isolation across both 2.5–5.0 GHz and 5.0–7.0 GHz bands.

It supports both upper and lower sideband selection in upconversion and downconversion modes, with verified performance at IF frequencies of 100 MHz, 1000 MHz, and 2000 MHz. The device maintains stable conversion loss (8–10.5 dB), IP3 (14–18 dBm), and port return loss (8–12 dB) over full RF/LO range and temperature.

Key Specifications

Pinout & Package

24-terminal ceramic leadless chip carrier (LC4) package with exposed thermal pad; RoHS-compliant, surface-mount compatible, and rated for MSL3 reflow (260°C peak).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar mixer applications.

Compared with HMC1048LP4E and ADM-0026, the HMC557ALC4TR-R5 offers superior LO-to-RF isolation (50 dB) and tighter conversion loss (8 dB) specifically within the 2.5–7.0 GHz band, making it the optimal choice for C-band point-to-point and military comms where spectral purity and power efficiency are critical.

Availability

HMC557ALC4TR-R5 is available at Aetrix Electronics and suitable for point-to-point radios, test equipment, and military communications requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for HMC557ALC4TR-R5 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 is a global leader in high-performance analog, mixed-signal, and RF ICs, serving communications, industrial, and defense markets with precision signal processing solutions.

The HMC557ALC4TR-R5 belongs to Analog Devices' Hittite Microwave MMIC product line, engineered for high-linearity, wideband RF front-end applications in infrastructure and electronic warfare systems.

FAQ

What is the recommended LO drive level for optimal performance of the HMC557ALC4TR-R5?

The HMC557ALC4TR-R5 achieves best conversion loss, IP3, and isolation with LO drive between +13 dBm and +15 dBm. Performance remains stable from +9 dBm to +17 dBm, but below +11 dBm increases conversion loss by ~1.5 dB, and above +16 dBm risks compression or reliability degradation. The HMC557ALC4TR-R5 datasheet specifies +15 dBm as the reference condition for all key metrics including conversion loss (8 dB typ) and IP3 (18 dBm typ).

Does the HMC557ALC4TR-R5 require external DC blocking or biasing components?

No, the HMC557ALC4TR-R5 is a fully passive double-balanced mixer with DC-coupled LO, RF, and IF ports, requiring no external biasing, DC blocking capacitors, or matching networks. All ports are internally matched to 50 Ω. External DC grounding of NIC pins is required only for measurement consistency-not functional operation-and the HMC557ALC4TR-R5 operates reliably with direct 50 Ω RF/LO/IF connections.

Can the HMC557ALC4TR-R5 be used for both upconversion and downconversion?

Yes, the HMC557ALC4TR-R5 supports bidirectional operation as both an upconverter and downconverter across its full 2.5–7.0 GHz RF/LO range. Datasheet characterization confirms validated performance for both upper and lower sideband selection in each mode, with measured conversion loss, IP3, and isolation specified separately for USB/LSB configurations at IF = 100/1000/2000 MHz. The HMC557ALC4TR-R5 requires no hardware changes to switch between modes.

What is the thermal management requirement for the HMC557ALC4TR-R5 in continuous operation?

The HMC557ALC4TR-R5 has a channel-to-ground thermal resistance of 105°C/W and maximum channel temperature of 175°C. For continuous operation at max RF/LO input power (25 dBm RF, 27 dBm LO), the exposed pad must connect to a low-impedance thermal ground plane using ≥6 vias (0.3 mm diameter) to an internal ground layer. At ambient +85°C, this ensures junction temperature stays below 150°C. The HMC557ALC4TR-R5 derates 9.5 mW/°C above 85°C ambient.

Is the HMC557ALC4TR-R5 pin-compatible with other Hittite LC4-packaged mixers?

The HMC557ALC4TR-R5 shares the same 24-terminal ceramic leadless chip carrier (LC4) footprint and pinout as HMC557A-series variants (e.g., HMC557ALC4, HMC557ALC4TR), including identical GND, LO, RF, IF, and NIC assignments. However, it is not pin-compatible with unrelated LC4 mixers like HMC774A or HMC1113LP5E, which differ in port assignment and internal topology. Always verify pin function descriptions in the respective datasheets before substitution.