Analog Devices Inc. HMC253QS24ETR

Overview

HMC253QS24ETR from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC SP8T non-reflective RF switch operating from DC to 2.5 GHz, featuring 1.3 dB typical insertion loss at 2 GHz, 30 ns rise/fall time, and integrated 3:8 TTL decoder. It uses a single +5 V supply and is designed for signal routing in broadband RF front-ends.

For engineers reviewing the HMC253QS24ETR datasheet, HMC253QS24ETR pinout, HMC253QS24ETR application, or HMC253QS24ETR equivalent, key selection criteria include its non-reflective architecture, TTL/CMOS-compatible control interface, 24-lead QSOP package, and performance across CATV, CDMA, and cellular frequency bands.

Technical Context

The HMC253QS24ETR implements a monolithic GaAs MMIC SP8T switch with internal DC blocking on all RF ports and non-reflective termination in the off-state. Its integrated 3:8 decoder accepts three TTL/CMOS logic inputs (A, B, C) to select one of eight RF paths from RFCOM to RF1–RF8.

It operates with a single +5 V bias (±10%), draws 6 mA typical supply current, and maintains specified RF performance over −40°C to +85°C. Control voltage thresholds are defined as low ≤0.8 V and high ≥2.0 V, enabling direct interfacing with standard digital logic without level-shifting.

Key Specifications

Pinout & Package

Package: 24-lead QSOP (Quad Small Outline Package), RoHS-compliant, matte tin-plated leadframe, MSL1 rating, 0.15 mm max moldflash per side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with QM11028 and SKY13372-374LF, the HMC253QS24ETR uniquely combines integrated TTL decoding, non-reflective termination, and single-supply operation in a 24-pin QSOP-reducing component count and layout complexity for mid-band RF routing where reflection-free switching is essential.

Availability

HMC253QS24ETR is available at Aetrix Electronics and suitable for CATV infrastructure, CDMA base stations, and cellular handset front-end designs requiring stable component supply, consistent RF performance, and long-term obsolescence mitigation.

Supply support for HMC253QS24ETR 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. (ADI) is a global leader in high-performance analog, mixed-signal, and RF ICs, formed through acquisition of Hittite Microwave in 2014.

The HMC253QS24ETR belongs to ADI's legacy Hittite RF switches product line, engineered for broadband, non-reflective signal routing in communications infrastructure and wireless test equipment.

FAQ

What is the operating temperature range for the HMC253QS24ETR?

The HMC253QS24ETR is rated for continuous operation from −40°C to +85°C ambient temperature. This range is validated per absolute maximum ratings and electrical specifications tables in the official datasheet. The device maintains specified insertion loss, isolation, and switching characteristics across this full industrial temperature range, making it suitable for outdoor base stations and automotive telematics applications where thermal cycling occurs. All performance data in the HMC253QS24ETR datasheet is guaranteed at +25°C, with typical curves provided for −40°C and +85°C.

Does the HMC253QS24ETR require external DC blocking capacitors?

No, the HMC253QS24ETR does not require external DC blocking capacitors at RFCOM or RF1–RF8 ports-the device integrates internal DC blocking on all RF terminals. This is explicitly stated in the "Truth Table" note and confirmed in the evaluation board description, which omits series capacitors at those nodes. However, external bias tees or coupling networks may still be needed depending on system-level DC conditions, such as when driving from active sources with DC offset or connecting to biased LNAs/PAs.

What is the supply current consumption of the HMC253QS24ETR under typical operating conditions?

The HMC253QS24ETR draws 6.0 mA typical supply current (I_dd) at +5.0 Vdc and +25°C, with a maximum of 9.0 mA across temperature and process variation. This value is measured with all control inputs stable and no RF signal applied. Current draw remains constant regardless of selected RF path, as the internal decoder and switch core are fully biased during operation. The low quiescent current supports energy-efficient designs in battery-powered RF test gear and portable spectrum analyzers.

How is the HMC253QS24ETR controlled, and what logic levels are required?

The HMC253QS24ETR is controlled via three TTL/CMOS-compatible digital inputs (A, B, C) that directly accept 0–0.8 V for logic low and 2.0–5.0 V for logic high, with leakage currents of 5 µA (low) and 70 µA (high). No external pull-up/down resistors are needed. The truth table defines eight states mapping ABC combinations to RF1–RF8, and the integrated 3:8 decoder eliminates the need for external logic. This interface allows direct connection to FPGAs, microcontrollers, and ASICs without level-shifting circuitry.

What package type and lead finish does the HMC253QS24ETR use?

The HMC253QS24ETR uses a 24-lead QSOP (Quad Small Outline Package) with RoHS-compliant matte tin-plated copper alloy leadframe. It carries an MSL1 moisture sensitivity level rating and a maximum peak reflow temperature of 260°C. The package marking is "HMC253" followed by a 4-digit lot code. Dimensions exclude moldflash (0.25 mm per side), and all ground leads must be soldered to the PCB RF ground plane per the manufacturer's layout guidelines to ensure optimal RF performance.