HMC909LP4ETR

HMC909LP4ETR is a microwave mixer IC from Hittite (now Analog Devices). It is a small, four-lead MMIC in an LP4 package with a tape-and-reel option, designed for up/downconversion in RF/microwave front-ends.
Key points:
- Ports: RF input, LO, and IF output; intended for 50-ohm systems.
- Type: typically a compact, passive/multiplier mixer suitable for wideband applications.
- Applications: communications, radar, test equipment, and other microwave transceivers.
- Notes: external biasing and matching networks are per the datasheet; expects a specified LO drive and operates over a defined temperature range.
For precise frequency range, conversion loss/isolation, LO drive, power, and packaging details, consult the HMC909LP4ETR datasheet.

I don’t have enough info to provide reliable equivalents. Please confirm the HMC909LP4ETR function (mixer, amplifier, attenuator, switch?), frequency range, package and key specs (gain/noise figure/isolation/VSWR). With that I can list direct cross‑references (Analog Devices, Mini‑Circuits, Skyworks, etc.).

I don’t have live web access to pull the HMC909LP4ETR datasheet, so I can’t reliably state its pin count or pin functions from memory. Please either (a) upload the datasheet or a pinout image, or (b) confirm the manufacturer (Analog Devices/Hittite). Once you do, I’ll extract the exact pin count and list each pin’s function concisely.

Manufacturer: Analog Devices, Inc. (the HMC prefix originates from Hittite Microwave Corporation, which ADI acquired in 2014).
What kind of company: Analog Devices is a multinational semiconductor company that designs and manufactures analog, mixed-signal, and RF/microwave integrated circuits and modules for communications, industrial, automotive, aerospace/defense, and consumer markets.

Applications of HMC909LP4ETR include:
- Wideband RF front-ends for up/downconversion (mixer stage)
- Wireless communications: base stations, point-to-point links, satellite links
- Radar and electronic warfare systems
- Instrumentation, test and measurement equipment
- Aerospace/military RF systems and prototyping of RF front-ends
Essentially, it’s used in receiver/transmitter chains as a mixer or related RF front-end component across various microwave/millimeter-wave applications.

The HMC909LP4ETR is supplied in a 4.0 × 4.0 mm leadless surface-mount LP‑4 QFN package with exposed ground paddle. The "TR" suffix denotes tape-and-reel packaging.