Military Aviation Sealed DC Relay JQX-3MD 027V

Product Overview

The JQX-3MD 027V is a hermetically sealed, high-reliability Military Metal Relay designed for demanding aviation and defense applications. This Aviation Latching Relay operates with a 27V DC coil and features true bistable (latching) operation, maintaining its contact state without continuous coil power. Rated for 1A at 28V DC resistive load and capable of switching low-level signals down to 10μA/10mV, the JQX-3MD 027V delivers ultra-low coil power consumption (0.3–0.43W), fast switching (≤4ms), and exceptional dielectric strength (500Vrms). Its glass-to-metal sealed construction ensures leakage rates ≤10⁻³ Pa·cm³/s, protecting internal contacts from moisture, salt spray, and altitude pressure changes. As a core product in YM’s aerospace relay portfolio – which includes Polarized Relay, PCB Board Relay, Automotive Relay, Industrial Power Relay, and Aviation Microswitch – the JQX-3MD 027V is trusted for flight control interfaces, weapon systems, radar, and communication equipment in military aircraft, missiles, and ground support systems.

Technical Specifications

Coil Parameters (Latching, 27V DC)

• Nominal coil voltage: 27V DC (28V DC system compatible)
• Coil power consumption (pulse): (0.3–0.43)W – ultra-low for aviation relays
• Incentive pulse width: (10–50) ms – sufficient to set or reset
• Coil resistance: Approx. 1700–2400Ω at 25°C (depending on exact winding)
• Pick-up voltage (set): ≤75% of nominal
• Drop-out voltage (reset): ≥10% of nominal (for non-latching versions; latching uses bipolar pulse)

Contact Ratings

• Maximum switching current: 1A at 28V DC (resistive load)
• Low level switching capability: (10–50)μA, (10–50)mV – 1×10⁵ operations, ideal for dry circuits
• Reference resistive load: 1A, 28V DC, 1×10⁵ operations
• Initial contact resistance: ≤50mΩ; after life test ≤200mΩ

Timing & Isolation

• Action time (operate): ≤4ms (typical ≤3ms)
• Release time (reset): ≤4ms
• Dielectric strength (normal atmosphere): 500Vr.m.s., 50Hz; under low pressure: 250Vr.m.s., 50Hz
• Insulation resistance (normal atmosphere): >500MΩ; after high-level life test: >50MΩ

Mechanical & Environmental (Aviation Grade)

• Weight: <3g – ultra-light for airborne electronics
• Sealing (leakage rate): ≤10⁻³ Pa·cm³/s (hermetic, glass-to-metal seal)
• Operating temperature range: -65°C to +125°C
• Shock & vibration: Withstands 50g, 6ms half-sine; 10-2000Hz, 20g random vibration per RTCA/DO-160
• Terminal style: Standard DIP or solder hook (gold-plated)

All parameters are validated at 25°C ambient. The JQX-3MD 027V is manufactured and tested to MIL-PRF-39016 requirements for hermetically sealed relays.

Product Images & Visuals

Above: JQX-3MD 027V hermetically sealed relay (metal can). Contact YM for outline drawing, pin configuration, and environmental qualification reports.

Key Features & Advantages for Military Aviation

• True latching (bistable) operation: Dual-coil or single-coil polarity-sensitive design – maintains contact state without holding power, reducing system energy consumption by >90% compared to non-latching relays.
• Hermetic metal sealing (≤10⁻³ Pa·cm³/s): Glass-to-metal seal protects against moisture, salt spray, and altitude pressure changes – ensures >20-year shelf life and reliable operation in unpressurized aircraft bays.
• Ultra-low coil power (0.3–0.43W): Allows direct drive from avionics logic (e.g., 28V TTL/CMOS) with simple pulse drivers – minimizes heat generation and power supply load.
• Fast switching (≤4ms) & high isolation: 500Vrms dielectric strength and >500MΩ insulation prevent crosstalk in mixed-signal environments.
• Wide temperature & vibration tolerance: -65°C to +125°C operation and 20g vibration meet RTCA/DO-160 and MIL-STD-810 requirements.
• Excellent low-level signal switching: Gold-plated contacts reliably switch down to 10μA / 10mV – ideal for flight data acquisition, sensor multiplexing, and discrete I/O.

YM’s engineering advantage: The JQX-3MD 027V leverages advanced magnetic circuit technology from our Latching Relay and Polarized Relay families, ensuring consistent pull-in sensitivity across temperature extremes. Compared to commercial relays, this Metal Sealing Relay offers true hermeticity and extended life, making it the preferred choice for mission-critical systems. YM also supplies complementary components such as Aviation Band Switch, Aviation Swing arm Switch, Military aircraft Plug, Aviation Connector, and Aviation Press Meter for complete avionics integration.

How to Use the JQX-3MD 027V Latching Relay – Step by Step

1. Identify coil configuration: The JQX-3MD 027V is typically a dual-coil latching relay (set coil and reset coil) or single-coil with polarity sensitivity. Refer to the datasheet for your specific part number.
2. Apply set pulse: To close the contacts (common to NO), apply a +27V DC pulse to the set coil pins for 10–50 ms. Do not exceed the rated pulse width to avoid overheating.
3. State retention: After the pulse ends, the relay remains in the closed state indefinitely without any coil power – zero holding current.
4. Apply reset pulse: To open the contacts, apply a +27V DC pulse to the reset coil pins (or reverse polarity for single-coil version) for 10–50 ms. The relay returns to its open state.
5. Load connection: Connect your signal or small power load (max 1A 28VDC) to the common and normally-open terminals. For dry circuit applications (μA/mV levels), gold-plated contacts ensure reliable switching without cleaning.
6. PCB mounting: Insert the DIP package into a socket or solder directly. Wave soldering allowed (260°C max for 5 seconds). Ensure no flux enters the sealed relay body.

Pro tip for avionics engineers: Use an H-bridge driver (e.g., two MOSFETs) to generate bipolar pulses for single-coil latching versions. Always initialize the relay state during system power-up to avoid indeterminate states.

Application Scenarios & Key Buyer Benefits

Typical Military & Aerospace Applications

• Flight control systems: Autopilot mode selection, trim actuator control, and flap position feedback – latching holds state without power.
• Weapon release & arming circuits: High-reliability switching for missile launchers and bomb bay doors – hermetic sealing prevents contamination.
• Radar & electronic warfare (EW) systems: Signal routing and antenna selection – low-level capability ensures no distortion.
• Navigation & communication equipment: VOR/ILS frequency switching, transponder mode control – lightweight and compact.
• Unmanned aerial vehicles (UAVs): Power-constrained systems benefit from zero holding power, extending flight endurance.

Direct Value to International Buyers (Defense OEMs, MROs, System Integrators)

• Reduced system power & thermal load: Zero holding power eliminates coil heating – allows denser packaging in avionics LRUs.
• Lower lifecycle cost: Hermetic sealing prevents contact oxidation failures, reducing field returns and unscheduled maintenance.
• Simplified power supply design: Pulse operation eliminates continuous coil drivers and heat sinks – lowers BOM cost.
• Global compliance: MIL-PRF-39016 qualified, RoHS/REACH compliant, with AS9100D manufacturing – ready for FMS and direct defense contracts.

For aftermarket MRO providers, the JQX-3MD 027V offers a form-fit-function replacement for obsolete latching relays used in legacy aircraft (e.g., F-16, C-130, Black Hawk). YM provides cross-reference guides and sustainment support.

Certifications & Compliance

• MIL-PRF-39016 (hermetic, signal relay) – qualification data available upon request.
• RTCA/DO-160G (environmental conditions for airborne equipment): tested for temperature/altitude, vibration, humidity, and salt spray.
• ISO 9001:2015 & AS9100D certified manufacturing (aerospace quality management).
• RoHS 2011/65/EU & REACH (EC 1907/2006) compliant – full material declaration.
• Hermeticity: 100% tested per MIL-STD-883, method 1014 – leak rate ≤10⁻³ Pa·cm³/s.

Each production lot is 100% inspected for coil resistance, set/reset voltage, contact resistance, dielectric strength, and insulation resistance. Sample relays undergo destructive physical analysis (DPA) per MIL-STD-1580. Certificates of Conformance (CoC) and test data are provided with every shipment.

Customization Options

YM supports tailored JQX-3MD variants for specific aircraft platforms and special applications. Volume orders can include:

• Coil voltage: 5V, 12V, 15V, 24V, 28V, 48V DC – customized to match avionics bus.
• Contact material: Gold overlay (standard for low-level), AgPd (for mixed load), or Rhodium (for ultra-low level, <1μA).
• Terminal style & finish: Solder hook, straight DIP, or surface-mount gull-wing; tin or gold plating.
• Sealing enhancement: Additional internal getter for hydrogen-sensitive environments.
• Screening level: Commercial (standard), high-reliability (100% burn-in, temperature cycling), or space-level (DPA, radiation testing).
• Marking: Laser engraving of customer part number, date code, or inspection stamp.

Our engineering team provides application support, including SPICE models, thermal derating curves, and driver circuit recommendations. Minimum order quantities for custom variants apply – contact YM with your requirements.

Production Process & Quality Assurance (AS9100D Certified)

YM’s Aviation Relay production line follows a zero-defect, fully traceable process designed to meet AS9100D and customer-specific requirements.

• Incoming material control: 100% verification of magnetic alloys, contact wires, glass preforms, and metal cans – all from approved aerospace suppliers with COC and batch traceability.
• Coil winding & encapsulation: Precision winding with automated tension control; vacuum encapsulation using low-outgassing epoxy (NASA outgassing compliant).
• Contact assembly in Class 100 cleanroom: Alignment of contacts under 40x microscope; dynamic contact force measurement to ensure ≤50mΩ initial resistance.
• Hermetic sealing & leak detection: Resistance welding in dry nitrogen atmosphere; 100% helium mass spectrometry leak test (sensitivity 10⁻⁹ Pa·cm³/s).
• Environmental screening (100% for high-rel lots): Thermal shock (-65°C to +125°C, 10 cycles), constant acceleration (10,000g), and burn-in (168 hours at 125°C with periodic operation).
• Final electrical test: Automated test system (ATS) measures set/reset voltage, operate/release time, contact bounce, dynamic contact resistance, and insulation resistance at 500VDC.
• Destructive Physical Analysis (DPA): One unit per lot is cross-sectioned and examined per MIL-STD-1580 for internal workmanship.

With decades of experience in Metal Sealing Relay and PCB Signal Relay production, YM has supplied relays to major defense contractors. The JQX-3MD 027V is built to exceed the reliability expectations of next-generation military aircraft and UAV systems.