M17/176-00002 - 77 Ohm Twinaxial Teflon Jacket 1 Pair 24 AWG Braided Shield Coaxial Cable Per Foot

M17/176-00002 – MIL-DTL-17 77 Ohm Twinaxial Cable (Per Foot)

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The M17/176-00002 is a flight-critical, high-performance military specification twinaxial cable engineered for high-frequency signal transmission in demanding aerospace environments. Operating as the primary transmission substrate for modern avionics, this specialized cable is most notably utilized as the data-bus backbone for MIL-STD-1553 multiplex applications. Featuring a controlled 77 Ohm characteristic impedance, it is constructed to manage high-speed, differential data streams with minimal attenuation and maximum signal integrity, ensuring flawless communication between flight control computers, mission displays, and engine management suites across both pressurized and unpressurized airframe zones.

Manufactured in strict compliance with the rigorous MIL-DTL-17 (formerly MIL-C-17) governing military standard, this dual-conductor cable consists of two 24 AWG stranded silver-plated high-strength copper alloy conductors insulated with extruded polytetrafluoroethylene (PTFE) and twisted with companion fillers. This core is surrounded by a dense silver-plated copper shielding braid providing 93% minimum coverage, and sealed inside an extruded Perfluoroalkoxy (PFA) blue protective jacket. Sold per foot, the M17/176-00002 offers structural lightness without compromising the exceptional mechanical toughness and wide thermal operating margins required by defense and civil aviation systems.

The M17/176-00002 is indispensable for modern digital avionics integration, system modifications, and wire harness remediation. Its design actively prevents common electrical integration failures, such as high-frequency signal attenuation, clock-drift anomalies, and data-bus timing jitter. For avionics technicians, fleet operators, and procurement specialists, deploying this flight-certified, military-grade twinaxial cable guarantees complete compliance with standard aerospace wiring guidelines, ensuring predictable network lifecycle longevity and superior protection against transient electromagnetic environmental threats.

Key Features

• MIL-STD-1553 Databus Architecture: Optimized specifically for 1 MHz digital multiplex data bus systems, maintaining pristine differential wave form shapes over extensive run lengths.

• Controlled 77 Ohm Impedance: Engineered with rigid cross-sectional uniformity to stabilize characteristic line impedance and prevent signal reflections due to mismatched line terminations.

• Dual Silver-Plated High-Strength Alloy Conductors: Utilizes premium 19/36 stranding to combine high electrical conductivity with superior fatigue life under constant airframe vibrations.

• High-Density Silver-Plated Braided Shield: Provides 93% minimum shielding coverage, establishing a robust Faraday shield to completely isolate differential data lines from severe EMI/RFI noise.

• Chemically Inert Extruded PFA Outer Jacket: Offers maximum protection against fluid contamination—including Skydrol™ hydraulic fluid, jet fuels, and de-icing compounds—while remaining non-flammable and outgassing-resistant.

Technical Specifications

• Part Number: M17/176-00002

• Component Type: Flexible Twinaxial (Shielded Twisted Pair) RF Cable

• Governing Specification: MIL-DTL-17 / MIL-C-17

• Characteristic Impedance: $77\ \Omega\ \pm 7\ \Omega$ (Often referenced as 78 Ohm nominal)

• Conductor Gauge / Stranding: 24 AWG / 19 strands of 36 AWG wire (19/.005")

• Conductor Material: Silver-Plated High-Strength Copper Alloy (SPC)

• Insulation / Dielectric Material: Extruded Polytetrafluoroethylene (PTFE / Teflon™)

• Insulation Diameter: 0.042 inches (1.07 mm) per core

• Shielding Type: Single Braid Silver-Plated Copper Wire (38 AWG)

• Shield Coverage: 93% Minimum

• Outer Jacket Material: Extruded Perfluoroalkoxy (PFA-XIII / Blue)

• Nominal Outside Diameter (O.D.): 0.129 inches (3.28 mm)

• Nominal Capacitance: 24.0 pF/ft (78.7 pF/m)

• Maximum Working Voltage: 1000 Volts RMS (1.0 kV RMS Dielectric Strength)

• Operating Temperature Range: -55°C to +200°C

• Maximum Attenuation: 1.4 dB/100 ft @ 1 MHz, 4.5 dB/100 ft @ 10 MHz

• Nominal Component Weight: 0.018 lbs/ft (26.8 kg/km)

• Minimum Bend Radius (Installation): 1.50 inches (38.1 mm)

• NSN (National Stock Number): 6145-01-232-7484

• Certification Status: Certificate of Conformance (CoC) / FAA-PMA or STC eligible based on wire loom application

Aircraft Compatibility

• Commercial & Regional Transports: Boeing 737NG/MAX Series, Boeing 777/787, Airbus A320neo Family, Airbus A350, ATR 42/72, De Havilland Canada DHC-8 Q400.

• Military Platforms: Lockheed Martin F-16 Fighting Falcon, McDonnell Douglas F/A-18 Hornet, Lockheed C-130 Hercules, Boeing C-17 Globemaster III.

• Business Aviation Fleet: Gulfstream IV/V/G550/G650, Bombardier Challenger 604/605, Cessna Citation Excel/Sovereign/X.

• Rotary Wing: Sikorsky UH-60 Black Hawk, Boeing AH-64 Apache, Eurocopter/Airbus H145/H225.

• Note: Final wire type substitution and physical signal bus installation routes must be verified strictly by referencing the target aircraft’s Illustrated Parts Catalog (IPC), Wiring Diagram Manual (WDM), or applicable STC documentation.

Applications

• MIL-STD-1553 Multiplex Databus Networks: Primary physical medium for routing command/response data stream lines between flight controllers, line-replaceable units (LRUs), and remote terminals.

• Flight Management & Mission Systems: Critical high-reliability connections linking Air Data Computers (ADCs), AHRS, and radar tracking systems.

• High-Temperature Instrument Routing: Signal transport throughout unpressurized areas, wheel wells, and engine nacelle cavities exposed to extreme thermal dynamics.

Why Choose M17/176-00002?

Sourcing a genuine, fully trace-certified MIL-DTL-17 M17/176-00002 twinaxial cable is vital to ensuring total system safety and preventing catastrophic communication dropouts on the primary digital bus. Substandard commercial-grade shielded pairs often lack the structural precision required to control characteristic impedance, resulting in micro-reflections along the copper path that attenuate or corrupt data frames. In an aircraft utilizing multiplex architectures, an un-certified or degraded wire can lead to erratic cockpit instrumentation displays, unexpected sensor loss, or uncommanded flight control dropouts into alternate or direct laws. Utilizing genuine PFA/PTFE military-spec wire ensures absolute resistance to fluid ingress, high-altitude corona discharge tracking, and cold-flow grounding failures, preserving predictable dispatch reliability across all regional operations.

The high-integrity signal propagation properties of the M17/176-00002 cable depend directly on the principles of differential mode transmission and dielectric phase stability under environmental gradients. In a twinaxial configuration, digital information is transmitted symmetrically across two twisted conductors as equal and opposite voltage waveforms. By maintaining strict structural concentricity via an extruded polytetrafluoroethylene (PTFE) dielectric, the physical velocity of propagation ($V_p$) remains constant at 71% of the speed of light, effectively preventing wave skewing.

The tight twisting pattern of the dual 24 AWG strands forces any ambient electromagnetic flux to couple equally onto both lines; when these inputs reach the receiver's differential operational amplifier matrix, the matching common-mode noise is completely rejected, while the primary data signal is amplified. Surrounding this core is an anisotropic braided shield made of high-coverage, silver-plated copper, which intercepts skin-effect high-frequency radio frequency interference (RFI) and routes it safely to airframe ground. The outer perfluoroalkoxy (PFA) jacket provides a gas-tight, non-reactive outer barrier that resists chemical breakdown and prevents cold-flow wire deformation across tight layout runs, protecting the cable's geometry and ensuring it maintains its 77 Ohm characteristic impedance through complex flight patterns and high-G maneuvers.

Note: The M17/176-00002 is a flight-critical data bus medium. Incorrect shield grounding, routing too close to high-current AC power cables, or pinching the jacket below its minimum 1.50-inch installation bend radius can compress the internal PTFE dielectric, altering the line's characteristic impedance and causing critical data reflection faults. Cable stripping, wire termination with approved triaxial connectors (such as Trompeter TRB/TRT series), and subsequent Time-Domain Reflectometry (TDR) bus validation must be performed exclusively by certified avionics technicians or authorized repair facilities in strict accordance with the airframe’s standard wiring practices manual, FAA AC 43.13-1B Chapter 11, and relevant OEM directives.

Documentation

• MIL-DTL-17 General Specification for Radio Frequency Flexible Coaxial Cables

• FAA Advisory Circular AC 43.13-1B: Acceptable Methods, Techniques, and Practices - Aircraft Inspection and Repair (Chapter 11: Aircraft Electrical Systems)

• DLA Defense Standardization Program ASSIST MIL-DTL-17/176 Specification Sheet