Agilent Technologies 21356A Ultrasound Transducer

Agilent Technologies 21356A Ultrasound Transducer, 11-3L, is a linear‑array ultrasound probe historically used with Philips Sonos imaging platforms, most notably the Sonos 5500 and Sonos 7500 consoles. The part number 21356A is consistently paired with the 11-3L designation in reseller catalogs and marketplace listings, confirming its place in HP/Agilent’s legacy ultrasound portfolio that supported Philips’ Sonos systems. In multiple second‑hand marketplaces and catalogs, this transducer appears as the Philips/Agilent 21356A 11-3L, reinforcing its identity within the Philips/Agilent lineage and its intended compatibility with older Sonos consoles. The 11-3L/21356A combination is repeatedly referenced when discussing components for maintenance, replacement, or service on the Sonos family of systems, reflecting its status as a legacy probe within that ecosystem. While detailed technical specifications are not always published in public catalogs, the repeated pairing of 21356A with 11-3L across listings provides a reliable fingerprint for this specific transducer in the Philips/Agilent lineage.