Variable Attenuators

Variable attenuators are a type of radio frequency attenuator that permits the signal level to constantly change. Attenuators are devices that decrease the power of a signal without noticeably distorting its waveform. This protects the circuitry from receiving a signal that is too powerful. RS Components offer a range of high-quality devices from leading brands including Analog Devices and Texas Instruments. Browse our range for all of your electronic application needs.

Variable attenuators are used when the signal level needs to be able to change frequently. This is useful when you don't know exactly what the final desired signal range is or when accuracy is not a priority. Attenuators can be thought of as the opposite of signal amplifiers. An amplifier increases signal power (or amplitude) while an attenuator decreases it.

How do variable attenuators work?

The signal level of variable attenuators is altered either manually or remotely. In manual variable attenuators, the signal level is changed by physically controlling the device, using something like an adjustable screw control. If they are controlled remotely, a motor or PIN diode uses variable voltage to change the signal.

Types of variable attenuators

Variable attenuators come with PIN diodes or MESFETs (metal-semiconductor field-effect transistors) as resistors to modulate amplitude. They can use either balanced or unbalanced pi-pad or T-pad circuits.

Applications

Variable attenuators are used in various electronic applications in many industries. Some of the most common are

  • Mobile phone 3G infrastructure
  • Microwave and Radio
  • Test equipment and sensors
  • IF and RF applications

Our range of variable attenuators are available in industry-standard package types, pin counts and mounting types. With maximum attenuation levels ranging from 2 dB to 78 dB and maximum frequency ranging from 3 MHz to 50 GHz.


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Viewing 1 - 20 of 32 products
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Description Price Maximum Attenuation Maximum Frequency Maximum Insertion Loss Mounting Type Package Type Pin Count Dimensions Length Width Height Maximum Operating Supply Voltage Maximum Operating Temperature Minimum Operating Supply Voltage Minimum Operating Temperature
RS Stock No. 761-5444
Mfr. Part No.LM1972M/NOPB
HK$39.89
Each
units
78dB 3MHz - Surface Mount SOIC W 20 13.005 x 7.595 x 2.286mm 13.01mm 7.595mm 2.286mm 12 V +70 °C 4.5 V 0 °C
New
RS Stock No. 217-3730
Mfr. Part No.F2250NLGK
HK$62.39
Each (In a Pack of 2)
units
33.6dB 6GHz 1.9dB Surface Mount VFQFPN 16 - - - - - - - -
RS Stock No. 183-2446
Mfr. Part No.HMC802ALP3E
HK$55.44
Each (In a Pack of 2)
units
20dB 10GHz 3.5dB Surface Mount SMT 16 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5 V +85 °C - -40 °C
RS Stock No. 139-1741
Mfr. Part No.HMC425ALP3E
HK$251.469
Each (On a Reel of 18)
units
31.5dB 8GHz 4.7dB Surface Mount QFN 16 3 x 3 x 0.85mm 3.1mm 3.1mm 0.85mm 5 V dc +85 °C 3 V -40 °C
RS Stock No. 862-6411
Mfr. Part No.HMC624ALP4E
HK$95.45
Each
units
31.5dB 6GHz 3.8dB Surface Mount SMT 24 4.1 x 4.1 x 0.95mm 4.1mm 4.1mm 0.95mm 5 V +85 °C - -40 °C
RS Stock No. 162-6172
Mfr. Part No.LM1972M/NOPB
HK$35.941
Each (In a Tube of 36)
units
78dB 3MHz - Surface Mount SOIC W 20 13.005 x 7.595 x 2.286mm 13.01mm 7.595mm 2.286mm 12 V +70 °C 4.5 V 0 °C
RS Stock No. 183-2622
Mfr. Part No.HMC472ALP4E
HK$69.54
Each (In a Pack of 2)
units
31.5dB 3.8GHz 3dB Surface Mount SMT 24 4.1 x 4.1 x 0.95mm 4.1mm 4.1mm 0.95mm 5 V +85 °C - -40 °C
RS Stock No. 183-2354
Mfr. Part No.HMC624ALP4ETR
HK$63.548
Each (On a Reel of 500)
units
31.5dB 6GHz 3.8dB Surface Mount LFCSP 24 4.1 x 4.1 x 0.85mm 4.1mm 4.1mm 0.85mm 5 V +85 °C 3 V -40 °C
RS Stock No. 183-2534
Mfr. Part No.HMC624ALP4ETR
HK$90.93
Each
units
31.5dB 6GHz 3.8dB Surface Mount LFCSP 24 4.1 x 4.1 x 0.85mm 4.1mm 4.1mm 0.85mm 5 V +85 °C 3 V -40 °C
New
RS Stock No. 217-3722
Mfr. Part No.F1912NCGI
HK$34.667
Each (In a Tray of 490)
units
33dB 4GHz 2dB Surface Mount VFQFPN 20 - - - - - - - -
New
RS Stock No. 217-3731
Mfr. Part No.F2255NLGK
HK$33.955
Each (In a Tray of 624)
units
34.6dB 3GHz 1.7dB Surface Mount VFQFPN 16 - - - - - - - -
RS Stock No. 862-6206
Mfr. Part No.HMC653LP2E
HK$59.57
Each
units
25dB 25GHz 3dB Surface Mount SMT 6 2.05 x 2.05 x 1mm 2.05mm 2.05mm 1mm - +85 °C - -40 °C
New
RS Stock No. 217-3727
Mfr. Part No.F1956NBGI
HK$56.03
Each (In a Pack of 2)
units
31.75dB 6GHz 2.2dB Surface Mount VFQFPN 32 - - - - - - - -
RS Stock No. 183-2517
Mfr. Part No.HMC1119LP4ME
HK$108.24
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 217-3723
Mfr. Part No.F1912NCGI
HK$52.76
Each (In a Pack of 2)
units
33dB 4GHz 2dB Surface Mount VFQFPN 20 - - - - - - - -
New
RS Stock No. 217-3732
Mfr. Part No.F2255NLGK
HK$57.785
Each (In a Pack of 2)
units
34.6dB 3GHz 1.7dB Surface Mount VFQFPN 16 - - - - - - - -
RS Stock No. 160-2705
Mfr. Part No.HMC652LP2E
HK$55.481
Each (On a Reel of 50)
units
2dB 25GHz - Surface Mount SMT 6 2.05 x 2.05 x 1mm 2.05mm 2.05mm 1mm - +85 °C - -40 °C
New
RS Stock No. 217-3729
Mfr. Part No.F2250NLGK
HK$36.686
Each (In a Tray of 624)
units
33.6dB 6GHz 1.9dB Surface Mount VFQFPN 16 - - - - - - - -
RS Stock No. 139-1753
Mfr. Part No.HMC425ALP3E
HK$242.50
Each
units
31.5dB 8GHz 4.7dB Surface Mount QFN 16 3 x 3 x 0.85mm 3.1mm 3.1mm 0.85mm 5 V dc +85 °C 3 V -40 °C
RS Stock No. 183-2557
Mfr. Part No.HMC652
HK$147.80
Each
units
2dB 50GHz - Surface Mount Chip 6 0.45 x 0.42 x 0.1mm 0.45mm 0.42mm 0.1mm 5.6 V +85 °C - -55 °C