What are Space Qualified Solid State Relays?

Space Qualified Solid State Relays are switching devices that use semiconductor elements to control the flow of electrical signals without relying on mechanical contacts. These relays typically employ optoelectronic or electronic isolation mechanisms to transfer control signals from the input to the output stage, enabling switching action through components such as transistors, MOSFETs, or thyristors. Their solid-state nature eliminates contact wear, bounce, and arcing, resulting in predictable switching characteristics and enhanced reliability in space environments.

In spacecraft systems, these relays are used for signal routing, power distribution control, and subsystem isolation, where consistent performance under radiation exposure, thermal variation, and vacuum conditions is required. Their behavior is governed by semiconductor switching dynamics, isolation structures, and thermal management within the package. Space qualification ensures that the relay maintains switching integrity, isolation strength, and electrical performance over mission durations while withstanding radiation-induced effects and mechanical stresses encountered during launch and operation.

Key specifications of space qualified solid state relay:

• Relay configuration: This parameter defines the arrangement of input-output channels and how switching paths are internally structured within the relay. It is critical for determining how signals or power lines are controlled, influencing system architecture, redundancy implementation, and the ability to manage multiple independent or coupled switching functions within a single device.
• Input voltage: This parameter specifies the control voltage required to activate the relay’s switching mechanism. It is important because it determines compatibility with driving circuitry, affects input stage design, and influences isolation requirements between control and load domains, ensuring proper triggering without overstressing the input interface.
• Output voltage: This parameter indicates the voltage level that the relay’s output stage can switch or withstand. It is essential for ensuring that the relay can safely handle the electrical conditions of the load circuit, maintaining reliable switching performance without breakdown or degradation under operational stress.
• Radiation: This parameter characterizes the relay’s tolerance to radiation effects encountered in space environments. It is a key selection factor because radiation can induce threshold shifts, leakage currents, and functional anomalies in semiconductor elements, and the relay must be designed and qualified to maintain performance under specified radiation exposure conditions.
• Switch configuration: This parameter describes the specific switching topology, such as how the output path opens, closes, or alternates between contacts. It influences signal routing flexibility, isolation behavior, and how the relay integrates into system-level switching schemes, particularly in applications requiring defined signal paths or fail-safe conditions.
• Power consumption: This parameter represents the electrical power required by the relay during operation, including both control and switching losses. It is significant because it impacts overall system power budgeting, thermal dissipation within the relay package, and long-term reliability, especially in power-constrained space platforms.
• Package type: This parameter defines the physical form factor and enclosure of the relay, including mounting and interconnection style. It affects thermal management, mechanical robustness, parasitic characteristics, and integration with spacecraft assemblies, making it a critical consideration for ensuring reliable operation under mechanical and environmental stresses.

The Largest Database of Space Qualified Solid State Relays

SatNow has listed Space Qualified Solid State Relays from the leading manufacturers and made them searchable by specification. You can enter the key parameters and the search tool will scan catalogs from the leading manufacturers to identify products that meet your spec. Once you find Space Qualified Solid State Relays that meet your requirement, you can view product information, download datasheets or request quotations. Quotation requests will be routed to the manufacturer of the product who will get back to you directly. The quotation will also be routed to distributors of the product in your region.