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RF Attenuators

IDT offers a wide range of monolithic silicon RF Attenuators that utilize either digital or analog control. All of IDT’s RF attenuators offer broad bandwidth, low insertion loss, high linearity with high attenuation accuracy, and low error. Applications supported by these RF attenuators include wireless infrastructure (base stations, broadband infrastructure (CATV), microwave radios, satellite and data terminals, general purpose communication equipment, and test and measurement equipment.

Download the IDT RF Digital Step Attenuators Product Overview (PDF)

IDT pioneered “Glitch-Free™” technology Digital Step Attenuators (DSAs), which enable customers to simplify their software interface, improve reliability, prevent damage to expensive sub-assemblies such as power amplifiers, and limit over-ranging of data converter inputs. Our innovative Glitch-Free™ technology eliminates attenuation setting overshoot (glitches) from the transmit and or receive paths by reducing transient “glitches” during most significant bit (MSB) transitions by up to 95 percent.

Alternatively, IDT’s Voltage Variable Attenuators (VVA) offer customers analog control for applications that require more precise attenuation. These VVA’s have nearly half the insertion loss of competitive solutions, high IP3 performance, and are linear in dB attenuation across the voltage control range. By using silicon-based RF semiconductor technology, IDT’s attenuators offer a robust alternative to older GaAs-based semiconductor technology. Silicon technology offers the advantages of more robust electrostatic discharge (ESD) protections, better moisture sensitivity levels (MSL), improved thermal performance, lower current consumption, and the proven reliability of silicon technology.

About RF Attenuators and Digital Attenuators

The purpose of an RF attenuator in a radio transmitter or receiver signal chain is to allow adjustment of signal amplitude based on the needs of the system. The attenuation value is typically adjusted using either digital attenuator (DSA) or by analog attenuator(VVA). There are trade-offs for selecting an analog or digital attenuator based on the application requirements. IDT's expert engineers are available to assist customers in selecting the most appropriate devices.


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FunctionFrequency Range (MHz)Supply Voltage (V)Pkg. TypeLead Count (#)Input IP3 (dBm)Gain (dB)Gain Resolution (dB)Output Impedance (Ω)
F1912 Datasheet REV 01F1912 Block DiagramF1912
6-bit 0.5 dB Glitch-Free™ ...
6-bit DSA1 - 40003 - 5.25VFQFPN2063-1.40.550
F1950 DatasheetF1950 Block DiagramF1950
7-bit 0.25 dB Glitch-Free™...
7-bit DSA150 - 40003 - 5.25VFQFPN2465-1.30.2550
F1951 DatasheetF1951 Block DiagramF1951
6-bit 0.50 dB Glitch-Free™...
6-bit DSA100 - 40003 - 5.25VFQFPN2468-1.20.550
F1953 Final DatasheetIDTF1953 - Block DiagramF1953
6-bit 0.50dB Glitch-Free™ ...
6-bit DSA w/integrated DC blocks400 - 40002.7 - 3.3VFQFPN2063-1.40.550
F1956 Datasheet REV02F1956 PinoutF1956
7-bit 0.25 dB Glitch-Free™...
7-bit DSA1 - 60003 - 5.25VFQFPN3264-1.30.2550
F1975 Datasheet REVOF1975 Block DiagramF1975
6-bit 0.5 dB, 75Ω, Glitch-...
6-bit DSA5 - 30003 - 5.25VFQFPN2064-1.20.575
F1977 Datasheet REV1F1977 Block DiagramF1977
7-bit 0.25 dB, 75Ω, Glitch...
7-bit DSA5 - 30003 - 5.25VFQFPN3264-1.40.2575
F2250 Datasheet REV03F2250 Block DiagramF2250
Wideband Voltage Variable RF...
Voltage Variable Attenuator50 - 60003.15 - 5.25VFQFPN1665-1.450
F2255 Datasheet REVOF2255 Block DiagramF2255
Wideband Voltage Variable RF...
Voltage Variable Attenuator1 - 30003.15 - 5.25VFQFPN1660-1.150
F2258 Datasheet REVOF2258 Block DiagramF2258
Wideband Voltage Variable RF...
Voltage Variable Attenuator50 - 60003.15 - 5.25VFQFPN1665-1.450