


Current Limited SSRs with Thermal Management (ThM) and Voltage Triggered Shutdown (VTS)
Specialized OptoMOS® single-pole, normally open Solid-State Relays (1-Form-A) with an integrated current limit feature that can replace electromechanical relays while enhancing the robustness of wireline interface applications. The active current-limit circuitry in these relays also has a thermal management feature that provides excellent power cross immunity for improved survivability in harsh environments. These features greatly improve the robustness of end systems that use these devices, when compared to systems using relays without integrated current limit. These devices may be used in both AC and DC applications.
CPC1540, CPC1563, and CPC1593 incorporate an additional safety feature, Voltage Triggered Shutdown (VTS), that quickly shuts the device down if a voltage transient, above the VTS threshold, occurs in the load while current limiting is in effect. These devices are ideal for use in noisy environments where such transients can be expected.
- Low drive current
- High reliability
- Provides galvanic input to output isolation
- Low drive current
- High reliability
- Provides galvanic input to output isolation
Fault Protected 1-Form-A Parts
Filters
Part Number | Actions | Blocking Voltage (VP) | Load Current max. AC/DC (mA) | Load Current max. DC-only (mA) | Current Limit max. AC/DC (mA) | Current Limit max. DC-only (mA) | On-Resistance AC/DC (Ω) | On-Resistance DC-only (Ω) | VTS Threshold Minimum (V) | Input Control Current (mA) | Switching Speeds ton / toff (ms) | Comment | IC Package Type |
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Part Number | Actions | Blocking Voltage (VP) | Load Current max. AC/DC (mA) | Load Current max. DC-only (mA) | Current Limit max. AC/DC (mA) | Current Limit max. DC-only (mA) | On-Resistance AC/DC (Ω) | On-Resistance DC-only (Ω) | VTS Threshold Minimum (V) | Input Control Current (mA) | Switching Speeds ton / toff (ms) | Comment | IC Package Type | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
250 | 200 | 350 | 450 | 920 | 15 | 3.75 | 2 | 2 / 2 | Industrial Applications | DIP/SMD-6 | ||||
230 | 450 | 1400 | 4 | 2.5 | 4 / 2 | Industrial Applications | PSIP-4(8) | |||||||
350 | 120 | 250 | 285 | 570 | 25 | 6.75 | 100 | 2 | 2 / 2 | PSTN Hook Switch Apps | DIP/SMD-6 | |||
60 | 300 | 600 | 900 | 1500 | 5.6 | 1.4 | 1.1 | 0.1 / 0.4 | Fast Switching Speeds | DIP/SMD-8 | ||||
60 | 1000 | 3000 | 0.245 | 2.5 | 2.5 / 0.5 | 1A AC/DC Load Current at up to 60°C | SOIC-16 | |||||||
600 | 120 | 250 | 285 | 570 | 35 | 11.75 | 100 | 2 | 2 / 2 | Telecom Secondary Protection | DIP/SMD-6 | |||
600 | 120 | 250 | 285 | 570 | 35 | 11.75 | 17.5 | 2 | 2 / 2 | HVAC, In-Rush Current Control | DIP/SMD-6 |
Fault Protected 1-Form-A Applications
- Replace electromechanical relays
- Replace mechanical switches
- Implement computer control of electromechanical circuits
Series: Fault protected 1-Form-A Resources

Integrated Circuits Selection Guide
Find solid state relays, IGBTs, MOSFETs, optocouplers, programmable capacitors, gate drivers, and LED drivers made by IXYS and sold by Littelfuse.