Analog Devices Inc. HMC641ATCPZ-EP-PT

Overview

HMC641ATCPZ-EP-PT from Analog Devices is a GaAs-based nonreflective SP4T RF switch operating from 0.1 GHz to 20 GHz, featuring 3.0 dB max insertion loss and 40 dB min isolation at 20 GHz, integrated 2-to-4 decoder logic, and −55°C to +125°C military temperature range for radar front-end switching.

For engineers reviewing the HMC641ATCPZ-EP-PT datasheet, HMC641ATCPZ-EP-PT pinout, HMC641ATCPZ-EP-PT application, or HMC641ATCPZ-EP-PT equivalent, key selection criteria include broadband isolation performance, negative-voltage control compatibility, LFCSP thermal management, and enhanced product qualification for defense-grade deployment.

Technical Context

The HMC641ATCPZ-EP-PT implements a nonreflective 50 Ω architecture with on-chip terminations for all off-state ports, enabling minimal signal reflection during state transitions across its full 0.1–20 GHz band. Its GaAs process supports high linearity (P1dB = 24 dBm, IP3 = 41 dBm) under −5 V supply.

Control is implemented via two negative-logic inputs (CTRLA/CTRLB) driving an integrated binary 2-to-4 decoder, eliminating external logic. Switching speed is characterized by 30 ns rise/fall time and 100 ns on/off time, optimized for microwave radio and ECM timing constraints.

Key Specifications

Pinout & Package

Package: 24-lead, 4 mm × 4 mm Lead Frame Chip Scale Package (LFCSP), CP-24-22, with exposed thermal pad requiring RF/dc ground connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SP4T RF switch applications.

Compared with HMC641ALP4E and QM11036, the HMC641ATCPZ-EP-PT uniquely combines military temperature operation, integrated decoder logic, and −5 V compatibility-enabling drop-in replacement in existing defense RF designs without layout or bias changes.

Availability

HMC641ATCPZ-EP-PT is available at Aetrix Electronics and suitable for test instrumentation, military radar front-ends, and broadband telecommunications systems requiring stable component supply across extended temperature and long lifecycle programs.

Supply support for HMC641ATCPZ-EP-PT 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 precision instrumentation, communications, and defense markets since 1965.

The HMC641ATCPZ-EP-PT belongs to Analog Devices' Enhanced Product line, engineered specifically for mission-critical aerospace and defense applications demanding extended temperature operation, controlled manufacturing, and AQEC-compliant traceability.

FAQ

What is the absolute maximum RF input power for HMC641ATCPZ-EP-PT at 20 GHz?

The absolute maximum RF input power for HMC641ATCPZ-EP-PT is 26.5 dBm on the through path and 23 dBm on the terminated path when VSS = −5 V and TCASE = 85°C. These ratings are specified up to 20 GHz and degrade below 250 MHz per Figure 2 in the datasheet. Exceeding these limits risks permanent damage to the GaAs switch core.

Does HMC641ATCPZ-EP-PT require external termination resistors?

No, the HMC641ATCPZ-EP-PT does not require external termination resistors. It features a nonreflective architecture with on-chip 50 Ω terminations for all four RF throw ports (RF1–RF4) when those ports are in the off state. This eliminates the need for discrete resistors and simplifies PCB layout in high-frequency designs.

Can HMC641ATCPZ-EP-PT operate with a −3 V supply instead of −5 V?

Yes, HMC641ATCPZ-EP-PT is fully specified to operate with VSS = −3 V. At this voltage, P1dB improves to 22 dBm (vs. 24 dBm at −5 V), and IP3 remains 41 dBm. Insertion loss and isolation specifications are maintained across the full 0.1–20 GHz band, though power handling decreases slightly per Absolute Maximum Ratings table.

What is the purpose of the NIC pins on HMC641ATCPZ-EP-PT?

The NIC (Not Internally Connected) pins on HMC641ATCPZ-EP-PT-pins 1, 5, 6, 13, and 18-have no internal connection but must be externally grounded to RF/dc ground on the PCB. All datasheet measurements, including isolation and return loss, were performed with these pins grounded; omitting this connection degrades RF performance and violates test conditions.

How is thermal management handled in the HMC641ATCPZ-EP-PT package?

Thermal management in the HMC641ATCPZ-EP-PT relies on its exposed thermal pad (EPAD), which must be soldered to a solid RF/dc ground plane on the PCB. The junction-to-case thermal resistance is 201°C/W for the through path. Proper EPAD grounding is mandatory to achieve rated power handling and prevent thermal runaway at high RF input levels.