Home Products Attenuators Switched Bit Attn.

Switched Bit  Attenuators 
Fast Switching Time
Low Harmonic Distortion
Single Attenuation Bit to Five Attenuation Bits
All equipped with TTL Driver
Custom Makes Available / Consult Factory

- Specifications are subject to change without notice

- Click on  the product model number  for Specifications-Sheet in PDF
- Click on  "
" to see the actual response curves (subject to availability)

UMCC offers this  selection of pin-diode switch-Bit attenuators in wide bandwidths and high speed switching  response time. Attenuators are available on special order to fit your specific application. All units are equipped with a high speed TTL driver. Each attenuation bit is controlled by one complementary (toggle) driver ckt and controlled via a single TTL/CMOS compatible command signal..

RF Circuit

 TTL Driver

Specifications for Standard 5-Bit Models

Model No.


(dB) Max
Attenuation Flatness 
(dB)  Peak-Peak
10dB 20dB 31dB
Response Curves in PDF
1 - 6 4.7 1.7:1 20 ns 60 ns 0.5 0.7 0.9 Fig.1
Response Curves in PDF
2 - 8 5.5 1.7:1 15 ns 50 ns 0.6 0.8 1.0
Response Curves in PDF
4 - 10 6.5 1.7:1 15 ns 50 ns 0.7 0.9 1.2

1)  [ 10% RF Power to 90% RF  Power (Rise Time) ] <> [ 90% RF Power to 10% RF Power (Fall Time) ]
[ 50% Command signal to  90% RF Power (ON Time) ] <> [ 50% Command signal to 10% RF Power (OFF Time) ]


Common Specifications (All Standard 5-Bit Models):
 Attenuation Range (Nominal): 31dB
 Number of Bits:
 Resolution (LSB): 1dB  (B0=1dB, B1=2dB, B2=4dB, B3=8dB, B4=16dB)
 Attenuation Accuracy (Mean Attenuation):  
    1- 10 dB 0.75 dB Max
    >10- 31 dB 1.25 dB Max
 Power Rating (Operating): +27 dBm CW/AVG <> 8W Peak, 1S PW
 Harmonic Distortion: 60dBc Min
 Control Input Characteristics: TTL / Unit-Load / Floating-High (Logic "1")
 Control Logic: Logic "0" = Bit "OFF" (Low Loss)
Logic "1" = Bit "ON" (Attenuation)
 Power Supplies: +5(0.25)V @ 180mA Max
-5(0.25)V @ 150mA Max
 Impedance (RF Path): 50 Ω
- RF Input / Output SMA (female), Removable
- Supply and Control Solder Pins
Environmental Ratings:
- Operating -55 C to +95C
- Storage -60 C to +110C
 Humidity: Mil-STD-202F, Method 103B Condition B
 Shock: Mil-STD-202F, Method 213B Condition B
 Vibration: Mil-STD-202F, Method 204D Condition B
 Altitude: Mil-STD-202F, Method 105C Condition B
 Temp. Cycle: Mil-STD-202F, Method 107D Condition B
Available Options:
1) units with options listed here may be subject to  some specification tradeoffs from the standard, consult factory
2) units with options listed here may be subject to lower or higher cost than the  standard units.
3) Some options may not be available on all models, consult factory
 RF Connectors Other Options (Consult Factory)
   B1   [ J1 SMA(M) ]   - Other Attenuation Range and Steps (5-Bits Max , LSB>1dB)
  B2   [ All SMA (M) ]   - Etc.
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Switched Bit Attn.