Analog Devices Inc. HMC252AQS24E

Overview

HMC252AQS24E from Analog Devices is a GaAs MMIC SP6T non-reflective switch operating from DC to 3.0 GHz with 1.0 dB typical insertion loss at 2 GHz, +3.3 V to +5 V single positive supply, and integrated 3:6 TTL decoder requiring only three control lines. It serves as a wideband RF path selector in base station front-ends and wireless test equipment.

For engineers reviewing the HMC252AQS24E datasheet, HMC252AQS24E pinout, HMC252AQS24E application, or HMC252AQS24E equivalent, key selection criteria include its non-reflective SP6T architecture, DC–3 GHz bandwidth, TTL/CMOS-compatible control, 24-lead QSOP package, and isolation >32 dB up to 3 GHz.

Technical Context

The HMC252AQS24E implements a monolithic GaAs MMIC SP6T switch with internal bias network and integrated 3:6 TTL decoder logic. Its non-reflective topology terminates all off-state RF ports to 50 Ω, eliminating signal reflections during state transitions.

It supports dual supply operation (VDD = +3.3 V or +5 V), delivers <1.4 dB insertion loss across DC–3 GHz, and achieves >32 dB isolation at 3 GHz. Switching is controlled via three TTL/CMOS-compatible digital inputs (A, B, C) with truth-table-defined RFCOM-to-RF1–RF6 routing plus ALL OFF state.

Key Specifications

Pinout & Package

Package: 24-lead QSOP (RoHS-compliant low-stress injection molded plastic, MSL1, 100% matte Sn finish).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SP6T RF switch applications.

Compared with HMC547LP3E and QM11036, the HMC252AQS24E uniquely integrates decoder logic and delivers optimized DC–3 GHz performance in a compact 24-lead QSOP, reducing BOM count and control overhead for mid-band SP6T applications.

Availability

HMC252AQS24E is available at Aetrix Electronics and suitable for base station infrastructure, CATV/DBS headend systems, and wireless test equipment requiring stable component supply, consistent RF performance, and long-term manufacturability.

Supply support for HMC252AQS24E 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, Inc. is a global leader in high-performance analog, mixed-signal, and RF ICs, serving communications, industrial, automotive, and instrumentation markets with precision signal processing solutions.

The HMC252AQS24E belongs to Analog Devices' Hittite Microwave MMIC switch product line, designed specifically for broadband, low-loss, non-reflective RF path selection in infrastructure-grade wireless systems.

FAQ

What is the operating temperature range for the HMC252AQS24E?

The HMC252AQS24E is specified for continuous operation from –40 °C to +85 °C ambient temperature. Its GaAs MMIC process and 24-lead QSOP package provide thermal resistance of 130 °C/W on the insertion-loss path, ensuring reliable performance in outdoor base station enclosures and industrial test equipment environments. The HMC252AQS24E maintains specified insertion loss, isolation, and switching characteristics across this full industrial temperature range.

Does the HMC252AQS24E require external DC blocking capacitors?

Yes, the HMC252AQS24E requires external DC blocking capacitors at both RFCOM and RF1–RF6 ports, as explicitly stated in the datasheet notes. This is necessary because the device does not integrate internal blocking capacitors, and RF ports are DC-coupled internally. Typical values used on evaluation boards are 100 pF (0402) for RF paths and larger bulk capacitance for bias feed lines. Failure to include these capacitors risks DC shorting and degraded RF performance.

What happens when the HMC252AQS24E is placed in the ALL OFF state?

When the HMC252AQS24E is set to the ALL OFF state (A=B=C=HIGH or A=B=C=LOW depending on truth table variant), the RFCOM port becomes reflective-not terminated-per datasheet note: "Input is reflective when 'ALL OFF' state is selected." This differs from normal operation where off-state RF ports are 50 Ω-terminated. System designers must avoid using ALL OFF in signal paths requiring stable impedance, such as between a PA output and antenna switch.

Can the HMC252AQS24E operate with both +3.3 V and +5 V supplies simultaneously?

No, the HMC252AQS24E operates from a single positive supply rail-either +3.3 V (±5%) or +5 V (±10%), not both. The supply voltage sets the logic threshold levels and internal bias points; mixing rails would damage the device. Current consumption is 3.3 mA typical at +3.3 V and 3.5 mA typical at +5 V. The HMC252AQS24E's absolute maximum VDD rating is +7 Vdc, so overvoltage protection is required if transient spikes are possible.

Is the HMC252AQS24E pin-compatible with other Hittite SP6T switches like HMC253AQS24E?

No, the HMC252AQS24E is not pin-compatible with HMC253AQS24E. While both are 24-lead QSOP SP6T switches, their pin functions differ: HMC252AQS24E uses dedicated A/B/C control inputs and RFCOM/RF1–RF6 layout, whereas HMC253AQS24E implements different control architecture and RF port assignments. The datasheets confirm distinct truth tables and pinout diagrams. Substitution requires PCB redesign; the HMC252AQS24E must be used per its validated 24-lead QSOP footprint and signal routing.