Analog Devices Inc. HMC340ALP5

Overview

HMC340ALP5 from Hittite Microwave Corporation (now part of Analog Devices) is a GaAs MMIC double-balanced dual mixer IC designed for RF/LO frequency operation from 1.7 to 4.5 GHz and IF bandwidth DC–1.5 GHz. It delivers 8.0 dB typical conversion loss, +20 dBm input IP3, 45 dB LO/RF isolation, and 0.1 dB conversion gain amplitude balance - enabling high-fidelity I/Q modulation and image-reject downconversion in compact SMT layouts.

For engineers reviewing the HMC340ALP5 datasheet, HMC340ALP5 pinout, HMC340ALP5 application, or HMC340ALP5 equivalent, this passive mixer's dual-channel symmetry, 5×5 mm QFN package, and proven performance in wireless infrastructure and SSB upconversion make it a critical component for precision RF front-end design where LO leakage, inter-channel balance, and wideband linearity are system-critical.

Technical Context

The HMC340ALP5 integrates two identical double-balanced mixer cores on a single GaAs die, each using Schottky diodes and monolithic baluns to achieve inherent common-mode rejection and high port-to-port isolation. Its RF/LO ports are DC-coupled and 50 Ω matched, while IF ports support DC-coupled operation with ≤4 mA current handling.

It operates as a passive device requiring +13 dBm LO drive for optimal performance, delivering consistent conversion gain balance (<0.25 dB max) and noise figure (8–10 dB SSB) across temperature (−40°C to +85°C). Dual-channel isolation (RF1–RF2, IF1–IF2, LO1–LO2) exceeds 40 dB, supporting independent signal paths in I/Q and image-reject architectures.

Key Specifications

Pinout & Package

32-lead, 5×5 mm leadless plastic QFN package (LP5) with exposed thermal paddle. Requires soldering of all ground leads and paddle to PCB RF ground per Hittite land pattern guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC340ALP5, the HMC1048LP4E trades isolation and loss for wider bandwidth, while the ADL5802ACPZ-R7 offers integration at the expense of true dual-channel flexibility - making HMC340ALP5 uniquely suited for high-fidelity, temperature-stable I/Q and image-reject systems below 4.5 GHz.

Availability

HMC340ALP5 is available at Aetrix Electronics and suitable for wireless infrastructure transceivers, microwave backhaul receivers, SSB upconverters, and direct-conversion I/Q modulators requiring stable component supply and long-term obsolescence mitigation.

Supply support for HMC340ALP5 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 RFICs and MMICs for defense, wireless, and test equipment markets.

The HMC340ALP5 belongs to Hittite's GaAs double-balanced mixer product line, engineered specifically for high-isolation, low-distortion dual-path RF signal processing in cellular infrastructure and point-to-point radio systems.

FAQ

What is the recommended LO drive level for optimal performance of the HMC340ALP5?

The HMC340ALP5 achieves best conversion loss, IP3, and isolation at +13 dBm LO drive. Operating below +11 dBm increases conversion loss and degrades IP3; exceeding +15 dBm yields diminishing returns and risks accelerated aging. The datasheet specifies +13 dBm as the nominal condition for all key specs including 8.0 dB conversion loss and +20 dBm input IP3 - and the HMC340ALP5 must be biased accordingly in final design validation.

Can the HMC340ALP5 be used for DC-coupled IF operation, and what are the current limits?

Yes, the HMC340ALP5 supports true DC-coupled IF operation on pins 12 (IF2) and 29 (IF1), but each IF port must not source or sink more than ±4 mA DC current. Exceeding this limit risks permanent die failure. For AC-coupled applications, external series capacitors sized for the target IF bandwidth (DC–1.5 GHz) are recommended - and the HMC340ALP5's DC-coupled capability eliminates capacitor selection uncertainty in zero-IF architectures.

How does the HMC340ALP5 achieve high LO/RF isolation, and why is that critical in base station designs?

The HMC340ALP5 achieves 45 dB typical LO/RF isolation via its double-balanced topology, GaAs Schottky diode symmetry, and monolithic balun integration - suppressing LO leakage into the antenna path. In LTE macro base stations, this directly reduces out-of-band emissions, relaxes front-end filter requirements, and helps meet stringent 3GPP ACLR masks - making the HMC340ALP5 a key enabler of efficient, spectrally clean transmission without added filtering complexity.

Is the HMC340ALP5 pin-compatible with other Hittite dual mixers such as the HMC340ALP4?

No, the HMC340ALP5 is not pin-compatible with the HMC340ALP4. The HMC340ALP5 uses a 32-lead 5×5 mm QFN (LP5) package, whereas the HMC340ALP4 uses a 24-lead 4×4 mm QFN (LP4). Pin functions, counts, and land patterns differ - and the HMC340ALP5's expanded pin set accommodates additional ground connections and improved thermal dissipation. Board redesign is required when substituting the HMC340ALP5 for any LP4 variant.

What thermal management practices are required for reliable operation of the HMC340ALP5 at maximum RF power?

The HMC340ALP5 has a junction-to-package thermal resistance of 60.4 °C/W and maximum continuous power dissipation of 1.07 W at 85°C ambient. To ensure reliability, the exposed paddle must be soldered to a solid PCB ground plane with ≥8 thermal vias (0.3 mm diameter) connecting to internal ground layers. Without proper thermal conduction, junction temperature can exceed 150°C - triggering permanent degradation. This thermal design is mandatory for sustained +13 dBm LO drive and RF input levels near P1dB (13 dBm) in the HMC340ALP5.