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 circuitry from receiving a signal that’s too powerful. 


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. 


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Description Prix Maximum Attenuation Maximum Frequency Maximum Insertion Loss Package Type Pin Count Dimensions Length Width Height Maximum Operating Supply Voltage Maximum Operating Temperature Minimum Operating Supply Voltage Minimum Operating Temperature Series
N° de stock RS 183-2446
Référence fabricantHMC802ALP3E
4,99 €
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Unité
20dB 10GHz 3.5dB SMT 16 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5 V +85 °C - -40 °C -
N° de stock RS 145-7843
Référence fabricantHMC653LP2E
4,481 €
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25dB 25GHz 3dB SMT 6 2.05 x 2.05 x 1mm 2.05mm 2.05mm 1mm - +85 °C - -40 °C Hittite
N° de stock RS 183-2575
Référence fabricantHMC653
36,85 €
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Unité
3dB 50GHz - Chip 6 0.45 x 0.42 x 0.1mm 0.45mm 0.42mm 0.1mm 5.2 V +85 °C - -55 °C -
N° de stock RS 168-4911
Référence fabricantHMC629ALP4E
12,689 €
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45dB 10GHz 3.75dB QFN 24 4.1 x 4.1 x 0.85mm 4.1mm 4.1mm 0.85mm 3 V, 5 V +85 °C - -40 °C -
N° de stock RS 183-2622
Référence fabricantHMC472ALP4E
5,965 €
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Unité
31.5dB 3.8GHz 3dB SMT 24 4.1 x 4.1 x 0.95mm 4.1mm 4.1mm 0.95mm 5 V +85 °C - -40 °C -
N° de stock RS 139-1753
Référence fabricantHMC425ALP3E
24,12 €
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31.5dB 8GHz 4.7dB QFN 16 3 x 3 x 0.85mm 3.1mm 3.1mm 0.85mm 5 V dc +85 °C 3 V -40 °C LSB
N° de stock RS 862-6206
Référence fabricantHMC653LP2E
5,37 €
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Unité
25dB 25GHz 3dB SMT 6 2.05 x 2.05 x 1mm 2.05mm 2.05mm 1mm - +85 °C - -40 °C Hittite
N° de stock RS 139-1741
Référence fabricantHMC425ALP3E
20,102 €
Each (On a Reel of 18)
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31.5dB 8GHz 4.7dB QFN 16 3 x 3 x 0.85mm 3.1mm 3.1mm 0.85mm 5 V dc +85 °C 3 V -40 °C LSB
N° de stock RS 131-4666
Référence fabricantHMC629ALP4E
13,18 €
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Unité
45dB 10GHz 3.75dB QFN 24 4.1 x 4.1 x 0.85mm 4.1mm 4.1mm 0.85mm 3 V, 5 V +85 °C - -40 °C -
N° de stock RS 862-6411
Référence fabricantHMC624ALP4E
9,37 €
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Unité
31.5dB 6GHz 3.8dB SMT 24 4.1 x 4.1 x 0.95mm 4.1mm 4.1mm 0.95mm 5 V +85 °C - -40 °C Hittite
N° de stock RS 183-2592
Référence fabricantHMC470ALP3E
8,52 €
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31dB 3GHz 2dB LFCSP 16 3.1 x 3.1 x 0.85mm 3.1mm 3.1mm 0.85mm 5 V +85 °C 3 V -40 °C -
N° de stock RS 183-2354
Référence fabricantHMC624ALP4ETR
6,02 €
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31.5dB 6GHz 3.8dB LFCSP 24 4.1 x 4.1 x 0.85mm 4.1mm 4.1mm 0.85mm 5 V +85 °C 3 V -40 °C -
N° de stock RS 183-2363
Référence fabricantHMC973ALP3E
10,087 €
Each (On a Tape of 50)
Unité
31dB 5GHz 5.6dB SMT 16 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5 V +85 °C - -40 °C -
N° de stock RS 183-2356
Référence fabricantHMC653
10,707 €
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3dB 50GHz - Chip 6 0.45 x 0.42 x 0.1mm 0.45mm 0.42mm 0.1mm 5.2 V +85 °C - -55 °C -
N° de stock RS 145-1329
Référence fabricantHMC624ALP4E
7,969 €
Each (On a Reel of 50)
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31.5dB 6GHz 3.8dB SMT 24 4.1 x 4.1 x 0.95mm 4.1mm 4.1mm 0.95mm 5 V +85 °C - -40 °C Hittite
N° de stock RS 183-2534
Référence fabricantHMC624ALP4ETR
9,25 €
Each
Unité
31.5dB 6GHz 3.8dB LFCSP 24 4.1 x 4.1 x 0.85mm 4.1mm 4.1mm 0.85mm 5 V +85 °C 3 V -40 °C -
N° de stock RS 862-6436
Référence fabricantHMC652LP2E
5,37 €
Each
Unité
2dB 25GHz - SMT 6 2.05 x 2.05 x 1mm 2.05mm 2.05mm 1mm - +85 °C - -40 °C Hittite
N° de stock RS 162-6172
Référence fabricantLM1972M/NOPB
2,885 €
Each (In a Tube of 36)
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78dB 3MHz - 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 -
N° de stock RS 183-2510
Référence fabricantHMC973ALP3E
12,10 €
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Unité
31dB 5GHz 5.6dB SMT 16 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5 V +85 °C - -40 °C -
N° de stock RS 761-5444
Référence fabricantLM1972M/NOPB
3,46 €
Each
Unité
78dB 3MHz - 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 -