6700 Series – PCB mounting

The Airpax™ 6700 series is a RoHS-compliant, sub-miniature, positive snap-action bimetallic thermostat designed for precision thermal sensing and control applications. It is a single-pole, single-throw (SPST) device available in both “open on rise” and “close on rise” configurations. The thermostat conforms to the TO-220/Y-220 international electronic package standard, allowing for high-speed automated placement and soldering on printed circuit boards (PCBs).

Key Features

• Gold-Plated Contacts: Enhances conductivity and durability.
• Extended Life Cycles:
  • Up to 20,000 cycles at maximum standard amperage.
  • Up to 100,000 cycles at maximum gold contact amperage.
• RoHS Compliant: Meets EU directive 2002/95/EC.
• Versatile Mounting: Suitable for surface and air sensing on PCBs and heat sinks.
• VDE Approved: Available with an optional “P” bracket for compliance with VDE standards.

Electrical and Thermal Specifications

• Contact Ratings:
  • 48 VDC, 0.5 A (resistive load) for 20,000 cycles.
  • 5 VDC, 0.001 A (gold contacts) for 100,000 cycles.
• Operating Temperature Range: 40°C to 130°C (104°F to 266°F).
• Temperature Tolerance: Standard ±5°C, with increments available in 5°C steps.
• Short-Term Exposure Limit: 260°C (500°F) for 10 seconds.
• Long-Term Exposure Limit: -55°C to 160°C (-67°F to 320°F).

Construction and Materials

• Dielectric Strength:
  • Nickel-plated copper bracket: 1480 VAC, 60Hz, 1 second.
  • Plastic mounting bracket (“P” option): 2000 VAC, 60Hz, 1 second.
• Insulation Resistance: 100 MΩ at 500 VDC.
• Shock Resistance: MIL-STD-202, Method 213, Test Condition C (100 G’s for 6 ms, half sine wave).
• Vibration Resistance: MIL-STD-202, Method 204D, Test Condition D (10 to 2,000 Hz).
• Sealing: High-temperature epoxy sealed for wave soldering and moisture resistance per Sensata specification S-722.
• Material Composition:
  • Base Material: PPS (Polyphenylene Sulfide), UL 94V-0 rated.
  • Terminal Material: 65% Copper, 18% Nickel.
  • Contact Material: Gold-plated or overlay silver crossbar.
  • Mounting Bracket: Nickel-plated copper (standard) or high-pressure laminated plastic (“P” option).
• Chemical Resistance: Resists water, salt, alcohol, ammonia, trichloroethane, and most organic solvents.

Applications

Designed for power supply thermal management and PCB-based applications, the 6700 series can be used in various industries, including:

• Computers and Peripherals: Thermal protection for processors and power supplies.
• Aerospace and Automotive: Monitoring and preventing overheating in sensitive electronic systems.
• Medical Devices: Ensuring precise thermal control in healthcare equipment.
• Industrial Test Equipment: Reliable operation in rugged environments requiring accurate thermal protection.
• Alarm Systems: Triggering indicators, alarms, or shutting down systems when reaching critical temperature thresholds.

Operational Configurations

The 6700 series thermostats are available in two operational modes:

1. Open on Rise (Limit Configuration – L): Breaks the circuit when temperature exceeds a pre-set limit, protecting components from overheating.
2. Close on Rise (Fan Configuration – F): Makes contact when temperature rises, ideal for activating cooling fans or warning systems.

Ordering Information

Each thermostat is assigned a unique part number based on its configuration:

• Contact Operation:
  • “F” = Close on rise (fan control).
  • “L” = Open on rise (over-temperature protection).
• Operating Temperature: Three-digit representation in degrees Celsius (e.g., 090 for 90°C).
• Mounting Bracket:
  • Standard (nickel-plated copper) – No designation required.
  • “P” = Plastic bracket for higher dielectric strength and VDE compliance.
• Factory Assigned Number: Optional four-digit suffix for special requirements.

Example:

• 67F090: Closes at 90°C, resets below 60°C.
• 67L060P: Opens at 60°C, resets below 40°C, plastic mounting bracket.

Conclusion

The Airpax 6700 series thermostats offer a compact, reliable, and efficient solution for thermal management in diverse applications. With robust electrical and environmental specifications, high durability, and precision switching capabilities, these thermostats ensure reliable thermal protection in demanding environments. Their compatibility with automated PCB assembly and RoHS compliance further enhance their utility in modern electronic and industrial applications.