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Low-Pass Electrical Filters, BNC Feedthrough


  • Passive Low-Pass Electrical Filters
  • Rejection: 40 dB Minimum, 60 dB Typical
  • Terminates Directly into High-Impedance Test Equipment
  • 1 dB Cutoff Frequencies Available from 1 kHz to 15 MHz

EF120

DC to 10 kHz Low-Pass Filter

Application Idea

EF503 Used in Conjunction with a High-Impedance Oscilloscope and Amplified Photodetector

EF502

DC to 100 kHz Low-Pass Filter

Related Items


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Engraved EF502
Click to Enlarge

Figure 1: Each EF100 Series in-line filter features two female BNC connectors. They are engraved with the part number, the type of filter, the passband range, and the response curve.
Engraved EF502
Click to Enlarge

Figure 2: Each EF500 Series coaxial filter has a male and female BNC connector. They are engraved with the part number, the type of filter, the passband range, and the response curve.
Electrical Filters Selection Guide
Low-Pass Electrical Filters
High-Pass Electrical Filters
DC Block Electrical Filters
Engraved Back of OAP
Click to Enlarge

The graph above shows a signal taken on an oscilloscope with (blue trace) and without (red trace) using a filter. The observed phase shift is introduced by the filter.

Features

  • 5th Order Elliptic Low-Pass Filter Design
  • Selection of 1 dB Passband Windows from 1 kHz to 15 MHz
  • Can be Driven by Any 50 Ω Load
  • Designed to be Terminated into High-Impedance Equipment
  • No External Power Supply Required

Thorlabs' Passive Electrical Filters are feedthrough BNC filters that allow the user to filter unwanted signals and noise with a guaranteed minimum rejection of 40 dB. These low-pass filters are designed to be driven by a low-impedance source and terminated directly into high-impedance equipment. Examples of typical 50 Ω (low-impedance) sources are Thorlabs' amplified photodetectors, while examples of high-impedance equipment include 1 MΩ oscilloscope terminals, DAQ boards, and 100 kΩ op-amp inputs. This page contains our series of low-pass electrical filters. Thorlabs also offers high-pass electrical filters and DC block electrical filters.

These are passive filters; therefore, no power supply is needed to run these devices. Additionally, they will not display any of the intermodulation distortions that are often observed when using active filters. Passive filters also have lower noise floors and lower thermal emission than their active counterparts, giving these filters higher signal-to-noise capabilities. Each filter is engraved with the part number, passband range, input/output impedance values, and a frequency response curve.

Low-Pass Filters
To ensure excellent suppression of frequencies in the stopband region, our 5th order low-pass filters are designed as high-order elliptic filters, providing excellent suppression of high frequency signals. The tables below include more information, such as the 3 dB, 30 dB, and 40 dB stopband frequencies.

Elliptic filters, also known as Cauer filters, produce some of the steepest signal attenuations after the passband when compared to most other passive filters (see the tables below for the filter's frequency response). This property ensures that these filters are well suited for applications that require severe attenuation of stopband frequencies close to the passband.

In-Line and Coaxial Package Designs
Thorlabs offers both in-line and coaxial BNC feedthrough styled filters (see Figures 1 and 2 to the right). The EF100 series filters are in-line and feature a box design with two female BNC connectors. The in-line design is intended to be used in between two BNC cables. The EF500 series filters are coaxial and feature a cylindrical design with a male and female BNC connector. This allows the filter to be directly attached to a device, such as an oscilloscope (see image above). Due to the larger size of the in-line filters, it is not recommended that these filters be attached directly to a measurement device. The larger size of in-line filters over coaxial filters is due to the inverse relationship between the filter frequency and the size of the internal electrical components inside the housing.


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Posted Comments:
Poster:mkirchner
Posted Date:2017-02-14 12:28:05.11
It would be good if you could include the phase response of these electrical filters along with the amplitude response. Some applications care about both the amplitude and phase properties.
Poster:tfrisch
Posted Date:2017-02-17 02:01:16.0
Hello, thank you for contacting Thorlabs. I will reach out to you directly regarding the phase response of these filters.
Poster:coen
Posted Date:2015-10-29 13:34:59.363
Dear Madame/Sir, I would be very interested in a low-pass filter with a cutoff of 10 kHz (anti-aliasing of audio signals). Would it be possible to modify the existing EF502? Kindest regards, Coen Elemans Dept of Biology, SDU Denmark
Poster:besembeson
Posted Date:2015-11-04 02:18:05.0
Response from Bweh at Thorlabs USA: This will be possible. The housing may look different for such lower frequency cutoffs and we will also need to know an acceptable rejection level for your application. Our Sweden office will be in contact with you.
Poster:lamarche.louis
Posted Date:2015-04-10 14:09:55.26
Hello, Could you send me an approximate analytic transfer function in the laplace domain for the EF256. I need to know if there will any ringing on my signal. Thank you for your help Regards. 450-652-8077
Poster:jlow
Posted Date:2015-04-27 01:40:40.0
Response from Jeremy at Thorlabs: Yes, we will send you the transfer function via e-mail.

Low-Pass Electrical Filters, In-Line, 1 kHz to 50 kHz

The in-line package of these filters offers two female BNC connectors.

Filter Box
Click for Details

Mechanical Drawing of
In-Line Design
Item #a EF110 EF112 EF114 EF120 EF122 EF124
1 dB Passband Window DC to 1 kHz DC to 2 kHz DC to 5 kHz DC to 10 kHz DC to 20 kHz DC to 50 kHz
3 dB Rejection >2.05 kHz >2.76 kHz >6.61 kHz >15.2 kHz >27.2 kHz >68.4 kHz
30 dB Rejection >3.1 kHz >4.27 kHz >9.95 kHz >24.5 kHz >41.6 kHz >102.1 kHz
40 dB Rejectionb >4.1 kHz >6.20 kHz >11.14 kHz >27.2 kHz >45.4 kHz >109.5 kHz
Frequency Response Curve 
(Click for Graph)
Click for Plot
Raw Data
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Raw Data
Source Impedance (Typical) 50 Ω
Load Impedance (Typical)c ≥100 kΩ
Input Voltage (Maximum) ±10 V
Storage Temperature -20 to 70 °C
  • Values reported for each item were measured at 25 °C.
  • The performance of each filter is measured out to 500 MHz.
  • Although these filters can be operated with termination resistances below 1 kΩ, the passband will narrow at smaller termination resistances and the performance is not guaranteed.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
EF110 Support Documentation
EF110Low-Pass Electrical Filter, ≤1 kHz Passband, In-Line BNC Feedthrough
$66.50
Today
EF112 Support Documentation
EF112Low-Pass Electrical Filter, ≤2 kHz Passband, In-Line BNC Feedthrough
$66.50
Today
EF114 Support Documentation
EF114Low-Pass Electrical Filter, ≤5 kHz Passband, In-Line BNC Feedthrough
$66.50
Today
EF120 Support Documentation
EF120Low-Pass Electrical Filter, ≤10 kHz Passband, In-Line BNC Feedthrough
$66.50
Today
EF122 Support Documentation
EF122Low-Pass Electrical Filter, ≤20 kHz Passband, In-Line BNC Feedthrough
$66.50
Today
EF124 Support Documentation
EF124Low-Pass Electrical Filter, ≤50 kHz Passband, In-Line BNC Feedthrough
$66.50
Today

Low-Pass Electrical Filters, Coaxial, 100 kHz to 15 MHz

The coaxial package of these filters offers one male and one female BNC connector.

Item #a EF502 EF504 EF506 EF508 EF510 EF516 EF501 EF526
1 dB Passband Window DC to 100 kHz DC to 240 kHz DC to 500 kHz DC to 1 MHz DC to 1.7 MHz DC to 4.5 MHz DC to 10 MHz DC to 15 MHz
3 dB Rejection >139 kHz >310 kHz >640 kHz >1.35 MHz >2.3 MHz >6 MHz >12 MHz >21.5 MHz
30 dB Rejection >199 kHz >475 kHz >1 MHz >2.1 MHz >3.4 MHz >9.5 MHz >20 MHz >34 MHz
40 dB Rejectionb >220 kHz >515 kHz >1.1 MHz >2.3 MHz >3.6 MHz >10.5 MHz >22 MHz >37 MHz
Frequency Response Curve 
(Click for Graph)
Click for Plot
Raw Data
Click for Plot
Raw Data
Click for Plot
Raw Data
Click for Plot
Raw Data
Click for Plot
Raw Data
Click for Plot
Raw Data
Click for Plot
Raw Data
Click for Plot
Raw Data
Source Impedance (Typical) 50 Ω
Load Impedance (Typical)c ≥100 kΩ
Input Voltage (Maximum) ±10 V
Storage Temperature -20 to 70 °C
  • Values reported for each item were measured at 25 °C.
  • The performance of each filter is measured out to 500 MHz.
  • Although these filters can be operated with termination resistances below 1 kΩ, the passband will narrow at smaller termination resistances and the performance is not guaranteed.
Filter Tube
Click for Details

Mechanical Drawing of
Coaxial Design
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
EF502 Support Documentation
EF502Low-Pass Electrical Filter, ≤100 kHz Passband, Coaxial BNC Feedthrough
$66.50
Today
EF504 Support Documentation
EF504Low-Pass Electrical Filter, ≤240 kHz Passband, Coaxial BNC Feedthrough
$66.50
Today
EF506 Support Documentation
EF506Low-Pass Electrical Filter, ≤500 kHz Passband, Coaxial BNC Feedthrough
$66.50
Today
EF508 Support Documentation
EF508Low-Pass Electrical Filter, ≤1 MHz Passband, Coaxial BNC Feedthrough
$66.50
Today
EF510 Support Documentation
EF510Low-Pass Electrical Filter, ≤1.7 MHz Passband, Coaxial BNC Feedthrough
$66.50
Today
EF516 Support Documentation
EF516Low-Pass Electrical Filter, ≤4.5 MHz Passband, Coaxial BNC Feedthrough
$66.50
Today
EF501 Support Documentation
EF501Low-Pass Electrical Filter, ≤10 MHz Passband, Coaxial BNC Feedthrough
$66.50
Today
EF526 Support Documentation
EF526Low-Pass Electrical Filter, ≤15 MHz Passband, Coaxial BNC Feedthrough
$66.50
3-5 Days

Mounting Clamps


Click to Enlarge

EF123 Mounted using an ECM100 on a Ø1/2" Post

Aluminum Clamps, Post Mountable
These anodized aluminum clamps provide secure mounting for the rectangular electrical filters sold above. The ECM100 fits onto the 1.00" side, while the ECM125 fits onto the 1.25" side. The clamp can snap onto the side of the filter housing and the flexure lock can be tightened using the 2 mm (5/64") hex locking screw on the side.

Each clamp has a #8 (M4) counterbore on the bottom. The counterbore allows the clamp to be mounted on a Ø1/2" post or any surface with an 8-32 (M4) tap. The clamp must be mounted via the counterbore before the filter housing is attached, as the counterbore will not be accessible once the housing is secured in the clamp.

Plastic Clamp, Double Sided
The EPS125 clamp can attach to the 1.25" side of the rectangular filter housings above. Two filters can be mounted to a single clamp for a secure and compact setup.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
ECM100 Support Documentation
ECM100Aluminum Clamp for Electronics Housing, 1.00"
$16.40
Today
ECM125 Support Documentation
ECM125Aluminum Clamp for Electronics Housing, 1.25"
$16.90
Today
EPS125 Support Documentation
EPS125Double-Sided Plastic Clamp for Electronics Housings, 1.25", Qty. 2
$6.00
Today
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