Cobham Signal & Control Solutions

Cobham Signal & Control Solutions is a leading supplier of high performance solid-state RFMW components and subsystems.

Surface Mount Tunnel Detectors

Cobham Signal & Control Solutions - Surface Mount Tunnel Detectors

Cobham Signal & Control Solutions offers a series of tunnel detectors built in surface mount modules. These modules include complete detector circuits with DC returns and RF bypass capacitors. Options include input pads or limiters to modify the operational range or offer input protection. The small size of surface mount packages allows for easier design and lower cost. They offer high reliability and are hermetically sealed, making them ideal for operation in harsh environments. Thermal stability is one of the prime advantages of tunnel diode detectors. Frequencies range from 10MHz to 4GHz. The output will not vary more than +/-0.15dB over the temperature range of -65°C to +100°C at these low frequencies. They have high sensitivity without any bias needed for operation. Standard output polarity is negative, but positive polarity output is an option.

  • Thermal Stability
  • Small Size
  • No Bias Required
  • Low Video Impedance
  • Transmitter Monitoring
  • Missile Guidance Systems
  • Input to Low-Noise Amplifiers
  • Broadband Or Narrowband ECM Receivers
  • Power and Signal Monitors
  • Doppler Radar and Beacon Receivers
  • Matched units available for Multi-channel Receivers, Amplitude Comparator Systems and Discriminators

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Surface Mount Tunnel Detectors
Part (1)
Typical (3)
Standard (4)
ACTM-1114 0.1 - 0.5 800 0.3 2.3:1 270 M47 M10
ACTM-1133 0.25 - 0.75 900 0.2 2.3:1 270 M47 M10
ACTM-1146 0.5 - 1 1000 0.2 2.3:1 270 M47 M10
ACTM-1136 0.5 - 2 1000 0.2 2.3:1 75 M47 M10
ACTM-1137 1 - 2 1000 0.2 2.3:1 75 M47 M10
ACTM-1129 0.1 - 4 900 0.4 2.3:1 270 M47 M10
ACTM-1130 2 - 4 900 0.3 2.3:1 12 M47 M10


  1. Available in both negative and positive polarities, substitute "N" or "P" in part number.
  2. Diode values can be changed to alter the level of sensitivity. As sensitivity is increased, VSWR will degrade. VSWR will improve as sensitivity is lowered. Flatness and TSS will also be influenced by these changes. If your applications require something special, please contact the factory.
  3. VSWR measured at or below -20dBm input power level.
  4. Video capacitance is used for RF bypass. This value can be changed if required for video response time or other considerations. Contact the factory if value other than those shown are needed.

Environmental Specifications:

MIL-E-5400, MIL-STD-202, MIL-E-16400
Operating Temp: -65°C to +100°C
Storage Temp: -65°C to +100°C
Humidity: MIL-STD-202F, M103, Cond B
Shock: MIL-STD-202F, M213, Cond B
Altitude: MIL-STD-202F, M105, Cond B
Vibration : MIL-STD-202F, M204, Cond B
Thermal Shock: MIL-STD-202F, M107, Cond A
Temperature Cycle: MIL-STD-202F, M105C, Cond D
Maximum Input Power: +14dBm
(This allows for 3dB margin from possible burnout at +17dBm)


Standard Screening:
Internal Visual per MIL-STD-883, Method 2017
Temperature Cycle: -65°C to +100°C, 10 cycles
Optional High-Rel Screening (Ref MIL-PRF-38534):
Internal Visual per MIL-STD-883, Method 2017
Stabilization Bake per MIL-STD-883, Method 1008
Temperature Cycle per MIL-STD-883, Method 1010
Constant Acceleration per MIL-STD-883, Method 2001
Burn-in per MIL-STD-883, Method 1015
Leak Test per MIL-STD-883, Method 1014
External Visual per MIL-STD-883, Method 2009



Part Number Ordering Information:

Example: ACTM-1130NM4720
ACTM-1130 Surface Mount Tunnel Detector, 2 - 4GHz
N: Negative output polarity
M47: Package Type
20: 20pF custom video capacitance (omit for standard value)