Entries by Jessica Niemi

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

Lowpass, Feed-Through, C-Circuit Filters Suppress Broadband Radio Frequency Interference

Gowanda, NY (USA) – TTE Filters, a 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 US Department of Defense DLA Land and Maritime’s MIL-PRF-28861 military standard. This series will be featured at the 2021 International Microwave Symposium 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 50Vdc to 200Vdc, Capacitance from 10pF to 15,000pF and Minimum Insertion Loss from 3dB to 60dB. 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). Please refer to the MIL-PRF-28861/12H standard for more information. The main body of each part in this series measures 0.128in. (3.25mm) in diameter while the main body height is 0.110in. (2.79mm) and the overall tip-to-tip length is 0.625in. (15.88mm). More technical information is provided in the ML61 datasheet at TTE’s website.

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

(per MilSpec)
Minimum Insertion Loss (dB) *
-002 ML610-153AS A 50 15000 7 25 40 50 60
-004 ML610-272BS A 100 2700 10 25 30 60
-006 ML610-502BS A 100 5000 15 30 35 60
-008 ML610-100CS A 200 10 4 10
-010 ML610-250CS A 200 25 10 15
-012 ML610-101CS A 200 100 3 20 20
-014 ML610-501CS A 200 500 15 30 50
-016 ML610-102CS A 200 1000 4 20 31 55
-018 ML611-153AS B 50 15000 7 25 40 50 60
-020 ML611-272BS B 100 2700 10 25 30 60
-022 ML611-502BS B 100 5000 15 30 35 60
-024 ML611-100CS B 200 10 4 10
-026 ML611-250CS B 200 25 10 15
-028 ML611-101CS B 200 100 3 20 20
-030 ML611-501CS B 200 500 15 30 50
-032 ML611-102CS B 200 1000 4 20 31 55
-034 ML610-103AS A 50 10000 4 20 35 40 60
-036 ML611-103AS B 50 10000 4 20 35 40 60

* Refer to MilSpec for details

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).

TTE welcomes inquiries regarding the upscreening of additional filters for applications in defense, military and space communities. The company also supports custom designs with extensive experience, proprietary manufacturing equipment, prototyping capabilities and testing facilities.

The ML61 series is manufactured, marked and sold under the Instec Filters name; Instec is now part of TTE. For technical assistance, part pricing or other information please contact TTE at +1-716-532-2234 or sales@tte.com.

Helpful Links:

Note: if the datasheet link does not work correctly (due to updating of the PDF file) please use the Series Info link to navigate to the current PDF.

Downloads Available:

Coverage by Electronic Specifier

TTE Filters Introduces Two New Series for High Frequency Testing Applications

LC17 & HC17 Filters Offer ‘Brick Wall’ Performance to 7GHz for Semiconductor and IC Testing
Gowanda, NY (USA) – TTE Filters, a US-based manufacturer of high-reliability RF filters and microwave filters for demanding communication and signal processing applications, introduces two new filter series for high frequency testing applications. The new filters – LC17 and HC17 – provide brick wall characteristics and performance to 7GHz making them ideal for Audio-Digital-Conversion and Digital-Audio-Conversion (ADC/DAC) test set ups. Such signal conditioning testing is especially important for semiconductor chips and integrated circuits where testing frequencies continue to trend higher and higher (now in the GHz range). Relevant markets include commercial, industrial, medical, military/defense and test & measurement.

These new filters will be featured at the 2021 International Microwave Symposium being held in Atlanta on June 8-10. Please stop by TTE booth #1129 to learn more. TTE is an affiliate of Gowanda Components Group.

TTE’s new filters leverage the steep roll-off response of Chebyshev topology in 17th order lowpass (LC) and highpass (HC) designs to address the testing industry’s need for filters that can operate at GHz frequencies – much higher than traditional brick wall anti-aliasing elliptical function filters which are typically limited to less than 500MHz. These new LC17 and HC17 filters, while not true brick wall filters, are designed in a way that their steep roll-offs closely resemble brick wall filters. Moreover, since TTE’s new filters are based on Chebyshev topology they have a slight ripple in the passband and no ripple in the stopband, unlike elliptical designs which have ripple in both the passband and stopband. Thus TTE’s filters provide desirable stopband performance at high frequency with limited passband ripple.

The passband to stopband ratio for the LC17 filter is -50dBc at 1.19 fo and -60dBc at 1.27 fo. That ratio for the HC17 filter is -50dBc at 0.84 fo and -60dBc at 0.78 fo. The frequency range for both filters is 1MHz to 7GHz. Standard or custom cases are available. The table below provides an overview of both series.

Overview of TTE’s “Brick Wall” Filters

Characteristic LC17 Filter Series
HC17 Filter Series
Description Chebyshev Lowpass Filter Chebyshev Highpass Filter
Frequency Range 1MHz to 7GHz 1MHz to 7GHz
Passband to Stopband -50dBc at 1.19 fo
-60dBc at 1.27 fo
-50dBc at 0.84 fo
-60dBc at 0.78 fo
Performance Comparison “Brick Wall” performance similar to Anti-aliasing Elliptical Function filter “Brick Wall” performance similar to Anti-aliasing Elliptical Function filter
Cases Available Standard or Custom Standard or Custom

A Summary Datasheet for TTE’s LC and HC series (both combined into one PDF) provides additional information about the new LC17 and HC17 filters. Complete technical information is available at the company’s website at, respectively, the Lowpass Chebyshev (LC) page and the Highpass Chebyshev (HC) page.

Please note that TTE offers low Total Harmonic Distortion (THD) versions of its filters – including the LC17T and HC17T – to improve ADC/DAC testing by reducing the harmonics inherently present in signal generators. To request a filter with low THD please specify the “T” option when ordering. When specified, the “T” option refers to a filter designed for optimum THD: -80dBc minimum, -96dBc typical and greater than -115dBc in some instances. Refer to TTE’s Low THD Filters table for more information.

A technical discussion about brick wall filters – and the LC17 and HC17 series – was recently issued by TTE (an affiliate of GCG) via the company’s Technical Tip entitled “The Need for High Frequency Brick Wall Filters“.

For technical assistance, part pricing, application-specific variations or other information please contact TTE at +1-716-532-2234 or sales@tte.com.

Helpful Links

Note: if datasheet links do not work correctly (due to updating of PDF files) please use the Product Information links to navigate to current PDFs.

Downloads available:

See media coverage by eBOM.com

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