HMC643LC5

HMC643LC5 is Analog Devices’ GaAs MMIC mixer (formerly Hittite) in a 5-lead ceramic package. It’s a broadband, likely double-balanced mixer used for up/downconversion in RF/microwave front-ends.
What it does:
- Mixes an RF signal with a local oscillator (LO) to produce a related IF output.
- Suitable for receivers, transmitters, radar, and test equipment across microwave bands.
Key points:
- Ports: RF input, LO input, IF output, plus ground/common pins.
- Features: compact surface-mount package with good port-to-port isolation; moderate LO-drive requirement.
- Typical use: front-end mixer in wireless, satellite, radar, and microwave links.
Design notes:
- Use recommended matching networks on RF/LO/IF per the datasheet.
- Observe LO drive level, DC blocking, biasing, and heat management as specified.
For exact frequency range, conversion loss, isolation, IP3, noise figure, and application guidelines, refer to the official HMC643LC5 data sheet and supplier application notes.

Equivalents depend on the device’s role and specs. Please share the desired frequency range, gain, noise figure, max input/output power, supply voltage, and package. With that, I’ll provide exact cross-references from Analog Devices, Qorvo, MACOM, and Mini-Circuits. Without specs, I can only suggest generic RF MMIC candidates in roughly the same band; exact equivalents require matching performance.

Pin count: 8 pins.
Function: HMC643LC5 is a GaAs MMIC mixer (double-balanced) with RF, LO, and IF ports used for RF frequency conversion (up/down conversion) in RF front ends.

- Manufacturer: Analog Devices (Hittite Microwave Corporation, acquired by Analog Devices in 2014).
- What kind of company: A US-based multinational semiconductor company that designs and manufactures analog, mixed-signal, and RF/microwave integrated circuits.

HMC643LC5 is a broadband GaAs MMIC mixer used for RF/microwave frequency conversion.
Typical applications:
- Up/down-conversion in RF transceivers and receivers
- LO-driven RF front-ends and mixer stages
- Radar, military/aerospace systems
- Satellite communications and point-to-point wireless links
- Telecom/test equipment and instrumentation RF front-ends
- Integration into compact MMIC modules and systems requiring RF down/up conversion

Leadless ceramic package (LCC).