300 kHz – 2.0 GHz Five-Bit Digital Attenuator with Serial-to-Parallel Driver

Please note: SKY12340-364LF is being discontinued and is not recommended for new designs. The suggested replacement is SKY12349-362LF

The SKY12340-364LF is a GaAs FET five-bit digital attenuator I/C with a serial-to-parallel driver. The device is provided in a 5 x 5 mm, 32-pin Quad Flat No-Lead (QFN) package.

The SKY12340-364LF is particularly suited at IF frequencies for which high attenuation accuracy, low insertion loss, and low intermodulation products are required.


Control Bits/ Interface Parallel/Serial5/S
Replacement Part SKY12349-362LF
Frequency (GHz) Min.0.3
Frequency (GHz) Max.2
LSB Attenuation (dB)0.5
Attenuation Range (dB)15.5
Typ. IL (dB)1.4-1.8
Typ. IIP3 (dBm)45
Typ. IP1 dB (dBm)30
PackageQFN, 32L
Package (mm)5 x 5 x 0.9


  • Single, +5 V DC supply voltage
  • Integrated silicon serial-to-parallel driver
  • Attenuation: 0.5 dB steps to 15.5 dB
  • Small, QFN (32-pin, 5 x 5 mm) Pb-free package (MSL1, 260 °C per JEDEC J-STD-020)

Product Documents