Qorvo CMD178C3

Overview

The CMD178C3 from Qorvo is a passive double-balanced fundamental mixer in a 3×3 mm leadless SMT package, operating from 11 to 21 GHz RF/LO and DC–6 GHz IF, with typical conversion loss of 7 dB, LO-to-RF isolation of 43 dB, and +9 dBm minimum LO drive-designed for high-isolation up/downconversion in Ka-band satellite and radar transceivers.

For engineers reviewing the CMD178C3 datasheet, pinout, applications, or equivalent options, key selection criteria include its wide IF bandwidth (DC–6 GHz), low LO drive requirement (+9 dBm), high port-to-port isolation, and compatibility with image-reject and SSB modulator configurations using external hybrids.

Technical Context

The CMD178C3 implements a passive GaAs MMIC double-balanced topology with integrated balun structures optimized for >40 dB LO-to-RF and LO-to-IF isolation across 11–21 GHz. Its DC-coupled LO, RF, and IF ports are impedance-matched to 50 Ω, enabling direct integration without external bias tees in most RF front-end designs.

It supports both upconversion and downconversion modes with consistent performance at IF = 100 MHz; measured spurious suppression exceeds 40 dBc for dominant mRF ± nLO products (e.g., 1RF–1LO, 2RF–1LO), and thermal stability is validated over –40°C to +85°C operating range.

Key Specifications

Pinout & Package

Package: 3×3 mm, 12-pin leadless surface-mount package with exposed die paddle (black alumina substrate); RoHS-compliant Pb-free finish (Ni/Pd/Au).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CMD177C3 and MM1-0118, the CMD178C3 delivers superior Ka-band isolation and lower conversion loss within its specified 11–21 GHz window, making it the optimal choice for narrowband, high-performance satellite and radar up/downconverters where spectral purity and thermal stability are critical.

Availability

CMD178C3 is available at Aetrix Electronics and suitable for Ka-band satellite uplinks, phased array radar transceivers, and 5G fixed wireless backhaul systems requiring stable component supply, consistent RF performance, and long-term manufacturability.

Supply support for CMD178C3 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

Qorvo is a U.S.-based fabless semiconductor company specializing in RF solutions for defense, aerospace, and communications infrastructure, with leadership in GaAs and GaN MMIC technologies.

The CMD178C3 belongs to Qorvo's CMD series of passive mixers, engineered specifically for high-isolation, low-LO-drive Ka-band applications in mission-critical RF front ends.

FAQ

What is the minimum LO drive level required for proper operation of the CMD178C3?

The CMD178C3 operates reliably with a minimum LO drive level of +9 dBm, as confirmed in its datasheet under electrical specifications. This low drive requirement reduces dependency on high-power LO amplifiers and supports energy-efficient Ka-band transceiver designs. Operating the CMD178C3 below +9 dBm may result in degraded conversion loss and increased noise figure. The device tolerates up to +22 dBm LO input without damage.

Can the CMD178C3 be used for DC-coupled IF operation, and what precautions apply?

Yes, the CMD178C3 supports DC-coupled IF operation at Pin 5, but strict current limits apply: the IF port must not source or sink more than 16 mA to avoid non-function or permanent damage. For AC-coupled use above ~100 kHz, a series capacitor is recommended. The CMD178C3's DC–6 GHz IF bandwidth makes it suitable for baseband and wideband digital IF interfaces when properly biased.

What is the thermal resistance and maximum power dissipation of the CMD178C3?

The CMD178C3 has a junction-to-case thermal resistance (QJC) of 472°C/W and a maximum power dissipation (Pdiss) of 138 mW, as specified in its absolute maximum ratings table. These values assume proper PCB thermal design-including multiple vias connecting the exposed die paddle to internal ground planes. Exceeding 138 mW or operating outside –40°C to +85°C ambient may compromise reliability or parametric performance of the CMD178C3.

Does the CMD178C3 require external matching components for 50 Ω operation?

No, the CMD178C3 features internally matched 50 Ω ports for LO (Pin 2), RF (Pin 8), and IF (Pin 5), eliminating the need for external matching networks in standard applications. Its DC-coupled design allows direct connection to 50 Ω traces, provided PCB layout follows Qorvo's land pattern recommendations (e.g., AN-105). External hybrids or splitters are only needed for image-reject or SSB configurations-not for basic mixer operation.

Is the CMD178C3 compliant with RoHS and ESD-sensitive handling requirements?

Yes, the CMD178C3 is RoHS-compliant per 2011/65/EU and 2015/863/EU directives, with Pb-free, halogen-free, SVHC-free, and antimony-free construction. It is classified as an ESD-sensitive device (HBM Class 1A per JS-001-2012) and MSL Level 1, meaning it can be stored indefinitely at ambient conditions without dry-pack requirements-but proper ESD controls must be observed during handling, assembly, and test to prevent latent damage to the GaAs MMIC core.