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BNC Terminators


  • Stub-Style or Feed-Through BNC Stub Terminators
  • Resistance Values Ranging from 50 Ω to 250 kΩ
  • Fixed and Variable Designs
  • Fixed Terminator Kit Available

Back

Front

FT104

Fixed, 100 kΩ Stub Terminator

T4119

Fixed, 50 Ω Feed-Through Terminator

FTK01

Fixed
Terminator Kit
(Not to Scale)

VT2

Variable Feed-Through
Terminator

Related Items


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Terminator Application
Click to Enlarge

A typical application for a stub-style BNC terminator is shown above. The FT502 5 kΩ terminator is connected via a T3285 BNC "T" adapter to an oscilloscope. A BNC cable connects the adapter to a biased photodetector (not shown). The detector outputs a current based on the incident photon flux; the oscilloscope can then measure the voltage across the BNC terminator.

Click to Enlarge

The VT2 Variable Resistance Terminator offers eight different resistance values.

Features

  • Feed-Through BNC Terminators
    • Variable Resistance: 50 Ω to 100 kΩ
    • Fixed 50 Ω Resistance
  • Stub-Style Terminators
    • Fixed Resistances Ranging from 50 Ω to 250 kΩ
    • Terminator Kit with Eight Resistance Values from 50 Ω to 250 kΩ

Thorlabs' BNC terminators are available in both feed-through and stub styles. Our feed-through terminators provide an in-line solution while our stub-style terminators offer a compact solution.

When using a reverse biased photodiode, such as our packaged biased detectors, a photocurrent is produced when photons are absorbed. A load resistor is placed across the output of the detector, and the voltage drop across the resistor is measured by an oscilloscope or multimeter. A 50 Ω load is typically used to maximize the signal bandwidth, but higher voltages are produced by higher resistances at the expense of lower bandwidth. The image to the far right shows a typical application with our DET100A biased detector and our FT502 5 kΩ stub-style terminator.

Thorlabs also includes our feed-through terminators in our electrical adapters kits, which also have a variety of BNC, SMA, and banana adapters.


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Posted Comments:
Poster:
Posted Date:2013-08-16 15:14:26.38
Dear Thorlabs, is there an upper limit to the bandwidth of your terminators other than T4119 (500MHz) such as VT1 or FT500 + T3285? Often it ends up in the several hundred MHz range unless specialized sub-components/assembly are used. I'm looking for a terminator to use with your SV2-FC as suggested in its manual. Regards, Charles
Poster:pbui
Posted Date:2013-08-27 12:11:00.0
Response from Phong at Thorlabs: BNC terminators are generally not recommended past 2 GHz. Both the VT1 and FT500 are not rated for 2GHz. We would recommend using an SMA terminator and a SMA Tee instead. The SV2-FC comes with an SMA output. For best results, we would recommend using a coaxial cable with SMA connectors and the detector should be directly terminated into the 50 Ohm input of an oscilloscope (no other external terminator used). Keep cables as short as possible, up to 4 feet should be no problem. You can find our SMA cables at http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=2888.

Feed-Through BNC Terminators

VT2 Specifications
Nominal
Value
Max Power
Ratinga
Max DC
Voltage
Value with
1 MΩ in Parallel
Value with
100 MΩ in Parallel
50 Ω 1 W 5 V 50 Ω 50 Ω
100 Ω 1 W 8 V 100 Ω 100 Ω
500 Ω 0.25 W 8 V 500 Ω 500 Ω
1 kΩ 0.25 W 12 V 1 kΩ 1 kΩ
5 kΩ 0.25 W 25 V 4.98 kΩ 4.99 kΩ
10 kΩ 0.125 W 25 V 9.90 kΩ 9.99 kΩ
50 kΩ 0.125 W 25 V 47.72 kΩ 49.75 kΩ
100 kΩ 0.125 W 25 V 90.91 kΩ 99.00 kΩ
General VT2 Specifications
Resistance Tolerance ±5%
Storage Temperature -30 to 60 °C
Operating Temperature 10 to 40 ­°C
  • Unless DC voltage limited.

Thorlabs offers two feed-through (in-line) terminators: the VT2 variable resistance terminator and the T4119 fixed 50 Ω terminator.

Variable Resistance BNC Terminator
This variable terminator allows the user to choose from eight discrete resistance values ranging from 50 Ω to 100 kΩ (see table to the right). Change the resistance by turning the dial inside the housing until the desired value appears in the window on the front of the housing. The resistance dial has two accessible grip points located on opposite sides of the housing. Please note that as the resistance is increased above 50 Ω the bandwidth will be decreased due to back reflections; at these higher resistance values, as the cable becomes longer the bandwidth will decrease further.

The variable resistance terminator is ideal for use with our biased photodetectors. For these photodetectors, a 50 Ω termination maximizes response time but can generate a low voltage in many coupling applications. The VT2 makes it convenient to switch to a higher resistance (and thus a higher voltage) while tweaking the system, and then down to a lower resistance for the maximum response time.

Fixed Resistance BNC Terminator
The T4119 is a 50 Ω feed-through terminator, which maximizes the signal bandwidth observable with our biased detectors. It can dissipate signals with input powers of 2 W (average at 25 °C) and frequencies up to 500 MHz.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
VT2 Support Documentation
VT2Variable Resistance BNC Feed-Through Terminator, 50 Ω to 100 kΩ
$180.00
Today
T4119 Support Documentation
T411950 Ω BNC Feed-Through Terminator
$36.50
Today

Stub-Style BNC Terminators

Thorlabs' stub-style BNC terminators are compact and designed for switching between different resistors quickly. In addition, the resistors chosen have maximum power ratings that support the full 0 to 10 V output capability of our biased detectors. For measuring high-speed signals, it is best to use a 50 Ω terminator to maximize the bandwidth of the biased detector. The higher resistance values are ideal for measuring low bandwidth signals with our biased detectors, as the voltage across the resistor will be higher. Please note that as the resistance is increased above 50 Ω the bandwidth will be decreased; at these higher resistance values, as the cable becomes longer the bandwidth will decrease further.

When using these terminators, it is necessary to use a BNC "T" adapter, such as our T3285, to connect both the signal BNC cable and the terminator to the detector.

Item # FT500 FT101 FT501 FT102 FT502 FT103 FT503 FT104 FT254
Nominal Resistance Value 50 Ω 100 Ω 500 Ω 1 kΩ 5 kΩ 10 kΩ 50 kΩ 100 kΩ 250 kΩ
Label Color (Click for Photo) White Red Orange Yellow Green Blue Gray Purple Light Blue
Maximum Power Ratinga,b 2 W 2 W 0.75 W 0.75 W 0.1 W 0.1 W 0.1 W 0.1 W 0.1 W
Maximum DC Voltageb 10 V 14 V 19 V 25 V 22 V 25 V 25 V 25 V 25 V
Value with 1 MΩ in Parallelc 50 Ω 100 Ω 500 Ω 999 Ω 4.975 kΩ 9.901 kΩ 47.619 kΩ 90.909 kΩ 200 kΩ
Value with 10 MΩ in Parallelc 50 Ω 100 Ω 500 Ω 1 kΩ 4.998 kΩ 9.990 kΩ 49.751 kΩ 99.010 kΩ 243.902 kΩ
Resistance Tolerance ±5%
Storage Temperature -30 to 60 °C
Operating Temperature 0 to 60 °C
  • Unless DC Voltage Limited
  • At the maximum power and voltage ratings, the terminators may be too hot to touch.
  • Calculated Based on Ohm's Law
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
FT500 Support Documentation
FT50050 Ω Fixed Stub-Style BNC Terminator
$28.75
Today
FT101 Support Documentation
FT101100 Ω Fixed Stub-Style BNC Terminator
$28.75
3-5 Days
FT501 Support Documentation
FT501500 Ω Fixed Stub-Style BNC Terminator
$28.75
Today
FT102 Support Documentation
FT1021 kΩ Fixed Stub-Style BNC Terminator
$28.75
Today
FT502 Support Documentation
FT5025 kΩ Fixed Stub-Style BNC Terminator
$28.75
Today
FT103 Support Documentation
FT10310 kΩ Fixed Stub-Style BNC Terminator
$28.75
Today
FT503 Support Documentation
FT50350 kΩ Fixed Stub-Style BNC Terminator
$28.75
Today
FT104 Support Documentation
FT104100 kΩ Fixed Stub-Style BNC Terminator
$28.75
Today
FT254 Support Documentation
FT254250 kΩ Fixed Stub-Style BNC Terminator
$28.75
Today

Stub-Style BNC Terminator Kit

The FTK01 Stub-Style BNC Terminator Kit contains eight terminators with resistance values ranging from 50 Ω to 250 kΩ. One T3285 BNC "T" Adapter (F-M-F) is also included in the terminator kit. When using these terminators, it is necessary to use a BNC "T" adapter to connect both the signal BNC cable and the terminator to the detector. The terminators and adapter are packaged in a 7.0" x 3.5" x 1.25" (177.8 mm x 88.9 mm x 31.8 mm) plastic box with nine labeled compartments. This kit offers added savings over individual resistor purchases. The table below provides specifications for each BNC terminator.

Resistor Item #FT500FT501FT102FT502FT103FT503FT104FT254
Nominal Resistance Value 50 Ω 500 Ω 1 kΩ 5 kΩ 10 kΩ 50 kΩ 100 kΩ 250 kΩ
Color Code White Orange Yellow Green Blue Gray Purple Light Blue
Maximum Power Ratinga,b 2 W 0.75 W 0.75 W 0.1 W 0.1 W 0.1 W 0.1 W 0.1 W
Maximum DC Voltageb 10 V 19 V 25 V 22 V 25 V 25 V 25 V 25 V
Value with 1 MΩ in Parallelc 50 Ω 500 Ω 999 Ω 4.975 kΩ 9.901 kΩ 47.619 kΩ 90.909 kΩ 200 kΩ
Value with 10 MΩ in Parallelc 50 Ω 500 Ω 1 kΩ 4.998 kΩ 9.990 kΩ 49.751 kΩ 99.010 kΩ 243.902 kΩ
Resistance Tolerance ±5%
Storage Temperature -30 to 60 °C
Operating Temperature 0 to 60 °C
  • Unless DC Voltage Limited
  • At the maximum power and voltage ratings, the terminators may be too hot to touch.
  • Calculated Based on Ohm's Law
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
FTK01 Support Documentation
FTK01Stub-Style BNC Terminator Kit, Set of 8
$164.00
Today
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