Microwave Journal
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TTE Filters Announces Instec “ML61” EMI/RFI Filter Series Attains MIL-PRF-28861 for Defense Applications

April 22, 2021

TTE Filters, designer and manufacturer of RF and microwave filters for high performance applications, announces that its Instec Filters brand ML61 EMI/RFI filters are now qualified to the U.S. Department of Defense DLA Land and Maritime’s MIL-PRF-28861 military standard. This series will be featured at the 2021 International Microwave Symposium (IMS2021) in Atlanta on June 8-9, booth #1129.

This series can now be used in military electronic systems to suppress and reduce broadband radio frequency interference which would otherwise compromise system performance. These high performance systems are utilized in military communication devices, oscillators, attenuators and low noise amplifiers.  

The electrical characteristic ranges of these lowpass, feed-through, C-circuit, solder-in ML61 filters include Rated Voltage from 50 to 200 Vdc, Capacitance from 10 to 15,000 pF and minimum insertion loss from 3  to 60 dB. The operating temperature is -55°C to +125°C. Refer to the table below for part-specific details.

The parts in this ML61 series are hermetically glass sealed at one end and epoxied at the other end, with the location of the glass seal dependent on the particular configuration. In conformance with the MilSpec, the company can provide these filters in Configuration A (ML610) or Configuration B (ML611). The main body of each part in this series measures 0.128 in. (3.25 mm) in diameter while the main body height is 0.110 in. (2.79 mm) and the overall tip-to-tip length is 0.625 in. (15.88 mm). 

Electrical Characteristics for Instec ML61 per MIL-PRF-28861/12H Military Dash Number

 The MilSpec qualification—specifically MIL-PRF-28861/12H Class B—required rigorous electrical, thermal and mechanical testing including solderability, moisture resistance, solvent resistance, corrosion resistance, physical shock, thermal shock, vibration and life testing of this series. Testing was performed at the in-house environmental testing lab of sister company Gowanda Electronics. This lab is Defense Logistics Agency Land and Maritime approved (in support of internal product qualifications).

The ML61 series is manufactured, marked and sold under the Instec Filters name; Instec is now part of TTE.