Analog Devices Inc. HMC245QS16TR

Overview

HMC245QS16TR from Analog Devices is a GaAs MMIC SP3T non-reflective RF switch in 16-lead QSOP package, operating from DC to 3.5 GHz with 0.7 dB insertion loss at 2.0 GHz, 40 dB isolation at 1.0 GHz, and integrated 2:3 TTL/CMOS decoder requiring only two control lines and +5 V bias - used in basestation infrastructure RF front-end path selection.

For engineers reviewing the HMC245QS16TR datasheet, HMC245QS16TR pinout, HMC245QS16TR application, or HMC245QS16TR equivalent, key selection criteria include non-reflective off-state matching, single-supply +5 V operation, TTL-compatible dual-control logic, RF port DC coupling with required blocking capacitors, and -40°C to +85°C industrial temperature range.

Technical Context

The HMC245QS16TR implements a monolithic GaAs pHEMT-based SP3T architecture with internal termination for all-off isolation and matched 50 Ω RF ports. Its integrated 2:3 decoder translates A/B logic inputs into three RF path selections plus an "all off" state without external logic.

It operates with DC-coupled RF paths requiring external blocking capacitors, supports +5 V ±10% supply with 2.2 mA typical I_DD, and maintains specified RF performance across -40°C to +85°C ambient - validated per JEDEC MO-137-AB QSOP package reliability standards.

Key Specifications

Pinout & Package

16-lead QSOP (Shrink Small Outline Package, RQ-16), RoHS-compliant, MSL1, JEDEC MO-137-AB compliant, body dimensions 4.90 × 3.91 × 1.65 mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SP3T RF switch applications.

Compared with HMC245AQS16E, HMC245QS16TR offers identical RF performance and pinout in production-ready tape-and-reel form; versus QM11036, it trades slightly larger QSOP size for integrated decoder, lower system-level component count, and simplified control timing.

Availability

HMC245QS16TR is available at Aetrix Electronics and suitable for basestation infrastructure, CATV/DBS receiver design, and wireless local loop equipment requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for HMC245QS16TR 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 semiconductor leader specializing in high-performance analog, mixed-signal, and RF technologies for precision signal processing and connectivity.

The HMC245QS16TR belongs to the Hittite Microwave (acquired by Analog Devices) GaAs MMIC SPnT switch product line, engineered for high-isolation, low-loss RF path selection in infrastructure and test equipment where reliability and broadband performance are critical.

FAQ

What is the operating frequency range of the HMC245QS16TR?

The HMC245QS16TR operates from DC to 3.5 GHz, delivering specified insertion loss, isolation, and return loss across this full bandwidth. Performance is characterized at +25°C in a 50 Ω system with TTL/CMOS control and +5 V supply, supporting applications including cellular infrastructure, satellite TV, and RF test instrumentation where wideband switching is required. The HMC245QS16TR maintains usable RF performance up to 3.5 GHz without rolloff-induced path degradation.

Does the HMC245QS16TR require external blocking capacitors on its RF ports?

Yes, the HMC245QS16TR features DC-coupled RF ports (RFC, RF1, RF2, RF3), so external DC-blocking capacitors are mandatory for AC-coupled signal paths. Typical values are 100 pF in 0402 package, placed as close as possible to the pins. This prevents DC bias from propagating into sensitive downstream components like LNAs or mixers, and ensures proper RF matching. The HMC245QS16TR datasheet specifies this requirement explicitly in the Pin Descriptions section.

What control logic levels does the HMC245QS16TR accept on pins A and B?

The HMC245QS16TR accepts TTL/CMOS-compatible control voltages: logic low is 0 to +0.8 Vdc (≤0.2 µA leakage), and logic high is +2.0 to +5 Vdc (≤35 µA leakage). These levels allow direct interfacing with standard microcontrollers, FPGAs, or logic ICs without level-shifting. The HMC245QS16TR truth table defines four states - RF1, RF2, RF3, and All Off - based on the A/B combination, and all operate reliably within the +5 V ±10% Vdd range.

Is the HMC245QS16TR pin-compatible with the HMC245AQS16E?

Yes, the HMC245QS16TR is fully pin-compatible and electrically identical to the HMC245AQS16E - both use the same 16-lead QSOP package, identical pinout, and share identical RF and DC specifications. The only difference is packaging format: HMC245QS16TR is supplied in tape-and-reel for automated assembly, while HMC245AQS16E is typically offered in cut-tape or sample reels. No PCB or schematic changes are needed when substituting HMC245QS16TR for HMC245AQS16E in production.

What is the thermal resistance and maximum channel temperature for the HMC245QS16TR?

The HMC245QS16TR has a channel-to-case thermal resistance of 150 °C/W for the insertion loss path and 297 °C/W for the terminated path, with a maximum allowable channel temperature of 150 °C. These values are defined under absolute maximum ratings and assume proper PCB thermal design - including adequate copper pour and via stitching under the exposed paddle (if applicable) and GND pins. The HMC245QS16TR is rated for continuous operation from -40°C to +85°C ambient, and thermal derating is required above 85°C ambient per the datasheet's thermal curves.