Aviation Sealed Relay JRW-211MT 27V TO-5

Product Overview

The JRW-211MT 27V TO-5 is a hermetically sealed, ultra-miniature Military Metal Relay designed for the most demanding aviation, aerospace, and defense applications. Housed in a standard TO-5 metal can package, this 27V DC relay offers true Latching Relay (bistable) operation, maintaining contact state without continuous coil power – ideal for power-sensitive avionics and battery-backed systems. Rated for 1A at 28V DC resistive load and capable of switching low-level signals down to 10μA/10mV, the JRW-211MT delivers ultra-low coil 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 member of YM’s aerospace relay portfolio – which includes Polarized Relay, PCB Board Relay, Automotive Relay, Industrial Power Relay, and Aviation Microswitch – the JRW-211MT is trusted for flight control interfaces, missile guidance, radar systems, and communication equipment where size, weight, and reliability are critical.

Technical Specifications

Coil Parameters (Latching, 27V DC)

• Nominal coil voltage: 27V DC (28V system compatible)
• Coil power consumption (pulse): (0.3–0.43)W – ultra-low for TO-5 relays
• Incentive pulse width: (10–50) ms – set or reset pulse duration
• Coil resistance: Approx. 1700–2400Ω at 25°C (dual-coil or single-coil options)
• Pick-up voltage (set): ≤75% of nominal

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 (TO-5 Package)

• Weight: <3g – ultra-light for miniature avionics
• 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: TO-5 8-pin or 10-pin DIP (gold-plated, weldable)

All parameters are validated at 25°C ambient. The JRW-211MT is manufactured and tested to MIL-PRF-39016 requirements for hermetically sealed relays.

Product Images & Visuals

Above: JRW-211MT in standard TO-5 metal can package. Contact YM for outline drawing, pin configuration, and environmental qualification reports.

Key Features & Advantages for Military Aviation

• Ultra-miniature TO-5 package: Occupies minimal PCB real estate (approx. 9.4mm diameter) – ideal for high-density avionics, missiles, and UAV flight computers.
• True latching (bistable) operation: Zero holding power reduces system energy consumption by >90% compared to non-latching relays – critical for battery-backed and power-limited applications.
• 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 bays.
• Ultra-low coil power (0.3–0.43W): Allows direct drive from avionics logic (e.g., 28V 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.
• Excellent low-level signal switching: Gold-plated contacts reliably switch down to 10μA / 10mV – perfect for sensor multiplexing and discrete I/O in flight control systems.

YM’s engineering advantage: The JRW-211MT shares advanced magnetic circuit design with our Latching Relay and Polarized Relay families, ensuring consistent pull-in sensitivity across temperature extremes. As a true Metal Sealing Relay, it outperforms commercial TO-5 relays in hermeticity and vibration tolerance. For complete avionics signal chains, YM also offers Aviation Band Switch, Aviation Swing arm Switch, Military aircraft Plug, Aviation Connector, and Aviation Press Meter – a one-stop solution for defense contractors.

How to Use the JRW-211MT TO-5 Latching Relay – Step by Step

1. Identify coil configuration: The JRW-211MT is typically a dual-coil latching relay (set and reset coils). Refer to the datasheet for pin assignment (TO-5 base).
2. Apply set pulse: To close the contacts (common to NO), apply a +27V DC pulse (10–50 ms) to the set coil pins. Do not exceed the rated pulse width to avoid coil damage.
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 (10–50 ms) to the reset coil pins. 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: The TO-5 package can be soldered into a standard 8-pin DIP socket or directly onto the PCB. Use a heat sink during soldering (max 260°C for 5 seconds). Avoid flux ingress – use no-clean flux.

Pro tip for avionics engineers: Always initialize the relay state during system power-up (apply a known set or reset pulse) to avoid indeterminate states. For single-coil versions, use an H-bridge driver to reverse polarity.

Application Scenarios & Key Buyer Benefits

Typical Military & Aerospace Applications

• Flight control computers: Discrete I/O expansion, autopilot mode selection, and actuator control – latching holds state without power drain.
• Missile guidance & fuzing: Ultra-miniature size and hermetic sealing enable deployment in high-G environments.
• Radar & electronic warfare (EW) modules: Signal routing and antenna switching – low-level capability ensures signal integrity.
• Satellite & space payloads: TO-5 relays are preferred for space applications due to their proven reliability and low outgassing.
• Unmanned aerial vehicles (UAVs): Power-constrained systems benefit from zero holding power, extending flight endurance.

Direct Value to International Buyers (Defense OEMs, MROs, Space Agencies)

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

For aftermarket MRO providers, the JRW-211MT offers a form-fit-function replacement for obsolete TO-5 latching relays (e.g., Teledyne 712, CII 3SBT). 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.
• MIL-STD-202 (environmental test methods) – vibration, shock, thermal shock.
• 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 JRW-211MT variants for specific military, aerospace, and space programs. Volume orders can include:

• Coil voltage: 5V, 12V, 15V, 24V, 28V, 48V DC – customized to match avionics bus or spacecraft power.
• Contact material: Gold overlay (standard for low-level), AgPd (for mixed load), or Rhodium (for ultra-low level, <1μA).
• Terminal style & finish: Standard TO-5 8-pin or 10-pin; gold or tin plating; weldable leads for hybrid microcircuits.
• Sealing enhancement: Internal getter for hydrogen-sensitive environments (space applications).
• Screening level: Commercial (standard), high-reliability (100% burn-in, temperature cycling), or space-level (DPA, radiation testing, outgassing).
• Marking: Laser engraving of customer part number, date code, or inspection stamp.

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

Production Process & Quality Assurance (AS9100D Certified)

YM’s TO-5 relay production line follows a zero-defect, fully traceable process designed to meet AS9100D and the most stringent customer requirements for military and space programs.

• Incoming material control: 100% verification of magnetic alloys, contact wires, glass preforms, and TO-5 headers – 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 TO-5 Relay production, YM has supplied relays to major defense contractors (Lockheed Martin, Raytheon, Northrop Grumman) and space agencies (NASA, ESA). The JRW-211MT is built to exceed the reliability expectations of next-generation military aircraft, missiles, and satellite systems.