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SALES@QUINSTAR.COM         +1 310.320.1111         

ISO9001:2015 & AS9100D         SUBMIT RFQ          CAREERS



Broad bandwidth, high isolation, low insertion loss; low VSWR, magnetic shielding available, double and higher junctions available.

For further information, please contact us at



Specifications and Ordering

Our designs are built onsite and upon request. We tailor each order through our sales engineers to better serve your purchase.


QuinStar’s Cryogenic Isolators are ferrite devices that offer exceptional performance down to the mK range. We design and manufacture our cryogenic isolators to meet your needs; our units come with customizable connector configurations. We also offer our cryogenic isolators in several magnetic shielding options to preserve the electrical performance of the devices when operating in strong magnetic fields.

Our standard cryogenic isolators are three-port components, with an input, output, and a terminated port to absorb reflected RF energy. These three ports constitute a single junction. In addition to single junction devices, our cryogenic isolators can be made as double, triple, or higher junction devices to meet your requirements. In a double junction device, the output of the first junction is cascaded into the input of the second junction. By doing this, the isolation of the unit is doubled, but by the same token so is the insertion loss. For example, if a single junction device has an insertion loss of 0.2 dB and an isolation of 20 dB, you can expect a double junction device to operate at 0.4 dB and 40 dB, respectively.

We also offer the QCI-G0301400XX, a unique isolator that uses a non-junction design to offer increased bandwidth and superior performance. Please note, however, that this device cannot be offered as a circulator.

Here at QuinStar, we are constantly reviewing and improving the performance of our cryogenic catalog. For the most up to date models and outline drawings, please contact our Sales Department.

In addition to individual units, we also offer all our cryogenic isolators in an array format. For more information, see QCC/QCN Cryogenic Arrays.

Ordering Information


Contact us at for ordering information or submit an RFQ.

Technical Information

Swipe table left and right to view all columns.

• All units work from the mK range to 77k
• First Table uses Max/Min specs and 2nd table uses typical specs
• Model number is determined by sales order. This corresponds to connector configuration & shielding chosen.

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