Fixed, Stub-Style BNC Terminator Kit

  • Kit Contains Eight Stub-Style BNC Terminators
  • Resistance Values Ranging from 50 Ω to 250 kΩ
  • Female-to-Male-to-Female BNC “T” Adapter Included


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  • Eight Fixed, Stub-Style BNC Terminators with Resistance Values Ranging from 50 Ω to 250 kΩ
  • One Female-to-Male-to-Female (F-M-F) BNC "T" Adapter Included
  • Packaged in a Compact Plastic Box with Nine Individual Compartments
  • Added Savings Over Individual Resistor Purchases

The FTK01 Fixed, 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 eight 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. The table below provides specifications for each BNC terminator included in the kit. This table is also present on the inside of the box. These terminators and other similar BNC terminators are also available separately.

Thorlabs' stub-style BNC terminators are a compact solution when the resistance value needs to be frequently changed. 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 below shows a typical application with our DET100A2 biased detector and our FT502 5 kΩ stub-style terminator.

For kits containing our 50 Ω feed-through terminators, see our electrical adapters kits, which also have a variety of BNC, SMA, and banana adapters.

Terminator Application
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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 our DET100A2 biased detector (not shown). The biased detector outputs a current based on the incident photon flux; the oscilloscope can then measure the voltage across the BNC terminator.
Resistor Item # FT500 FT501 FT102 FT502 FT103 FT503 FT104 FT254
Nominal Resistance
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
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
10 V 19 V 25 V 22 V 25 V 25 V 25 V 25 V
Value with 1 MΩ
in Parallel
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 Parallel
50 Ω 500 Ω 1 kΩ 4.998 kΩ 9.990 kΩ 49.751 kΩ 99.010 kΩ 243.902 kΩ
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.

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FTK01 Support Documentation
FTK01Stub-Style BNC Terminator Kit, Set of 8