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OptoMOS 1-Form-A (SPST-NO) Solid State Relays

Littelfuse offers an extensive portfolio of 1-Form-A (SPST-NO) Solid State Relays (SSRs) in various PC board-mount package sizes. These relays feature load current ratings from 50mA to 9A (20A with heat sink), and 30V to 1000V load voltage ratings. 1-Form-A relays are available in SOP-4, SIP-4, SMD DIP-4, SMD DIP-6, SOIC-16, Power i4-PAC, and ISOPLUS-264 packages. Fault-protected SSRs with active current limit and thermal shutdown are also available from Littelfuse to offer robust and rugged switching solutions.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (CHF) Filter the results in the table by unit price based on your quantity.	Qty.
Solid State Relays - PCB Mount SP, Normally-Open OptoMOS Relay CPC1540GSTR IXYS Integrated Circuits 1: CHF 4.92 9In Stock End of Life	Mfr. Part No. CPC1540GSTR Mouser Part No 849-CPC1540GSTR End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount SP, Normally-Open OptoMOS Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	9In Stock	Cut Tape CHF 4.92 CHF 4.40 CHF 4.14 CHF 3.97 Reel CHF 3.15 View CHF 3.80 CHF 3.71 CHF 3.65 CHF 3.10	Min.: 1 Mult.: 1 : 1’000
Solid State Relays - PCB Mount 1-Form-A 60V 600mA Solid State Relay CPC1560GS IXYS Integrated Circuits 1: CHF 6.86 988In Stock 2’300On Order End of Life	Mfr. Part No. CPC1560GS Mouser Part No 849-CPC1560GS End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A 60V 600mA Solid State Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	988In Stock 2’300On Order On Order Ship Dates Mfr. No: CPC1560GS Stock: 988 Can Dispatch Immediately On Order: 1’000 Expected 11/30/2026 1’300 Expected 1/31/2028 Factory Lead Time: 54 Weeks	CHF 6.86 CHF 6.11 CHF 5.80 CHF 5.50 View CHF 5.21 CHF 5.01	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount 1-Form-A 60V 600mA Solid State Relay CPC1560GSTR IXYS Integrated Circuits 1: CHF 6.53 10In Stock End of Life	Mfr. Part No. CPC1560GSTR Mouser Part No 849-CPC1560GSTR End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A 60V 600mA Solid State Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	10In Stock	Cut Tape CHF 6.53 CHF 5.81 CHF 5.34 CHF 5.12 View Reel CHF 4.08 CHF 4.90 CHF 4.62 CHF 4.51 CHF 4.08 MouseReel Available	Min.: 1 Mult.: 1 : 1’000
Solid State Relays - PCB Mount DC Only Single Pole i4-PAC CPC1718J IXYS Integrated Circuits 1: CHF 15.72 12In Stock 950Expected 8/25/2027 End of Life	Mfr. Part No. CPC1718J Mouser Part No 849-CPC1718J End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount DC Only Single Pole i4-PAC Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	12In Stock 950Expected 8/25/2027	CHF 15.72 CHF 14.00 CHF 13.37 CHF 12.91 View CHF 12.40 CHF 11.77 CHF 11.37 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount DC Only Single Pole i4-PAC CPC1786J IXYS Integrated Circuits 1: CHF 22.81 43In Stock 75Expected 12/30/2026 End of Life	Mfr. Part No. CPC1786J Mouser Part No 849-CPC1786J End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount DC Only Single Pole i4-PAC Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	43In Stock 75Expected 12/30/2026	CHF 22.81 CHF 20.40 CHF 19.47 CHF 19.21 View CHF 17.48 CHF 17.21 CHF 17.03 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount DC Only Single Pole i4-PAC CPC1788J IXYS Integrated Circuits 1: CHF 23.33 8In Stock 525On Order End of Life	Mfr. Part No. CPC1788J Mouser Part No 849-CPC1788J End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount DC Only Single Pole i4-PAC Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	8In Stock 525On Order On Order Ship Dates Mfr. No: CPC1788J Stock: 8 Can Dispatch Immediately On Order: 300 Expected 3/31/2027 225 Expected 5/12/2027 Factory Lead Time: 51 Weeks	CHF 23.33 CHF 20.57 CHF 19.55 CHF 18.79	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount 600V, 0.5mA AC Power Switch CPC1963G IXYS Integrated Circuits 1: CHF 10.10 162In Stock End of Life	Mfr. Part No. CPC1963G Mouser Part No 849-CPC1963G End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 600V, 0.5mA AC Power Switch Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	162In Stock	CHF 10.10 CHF 8.99 CHF 8.59 CHF 8.28 View CHF 7.98 CHF 7.31 CHF 7.19 CHF 7.10 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount 400V Single Pole 400V Power Relay CPC1967J IXYS Integrated Circuits 1: CHF 33.98 6In Stock 400On Order End of Life	Mfr. Part No. CPC1967J Mouser Part No 849-CPC1967J End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 400V Single Pole 400V Power Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	6In Stock 400On Order On Order Ship Dates Mfr. No: CPC1967J Stock: 6 Can Dispatch Immediately On Order: 325 Expected 1/6/2027 75 Expected 1/13/2027 Factory Lead Time: 54 Weeks	CHF 33.98 CHF 30.09 CHF 28.65 CHF 27.35	Min.: 1 Mult.: 1
Triac & SCR Output Optocouplers 250V Single Pole SIP Power Relay CPC1972GSTR IXYS Integrated Circuits 1: CHF 2.33 753In Stock End of Life	Mfr. Part No. CPC1972GSTR Mouser Part No 849-CPC1972GSTR End of Life	IXYS Integrated Circuits	Triac & SCR Output Optocouplers 250V Single Pole SIP Power Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	753In Stock	Cut Tape CHF 2.33 CHF 1.91 CHF 1.76 CHF 1.66 Reel CHF 1.56 View CHF 1.51 CHF 1.45 Quote MouseReel Available	Min.: 1 Mult.: 1 : 1’000
Triac & SCR Output Optocouplers 400V Single Pole SIP Power Relay CPC1973Y IXYS Integrated Circuits 1: CHF 8.52 96In Stock 100Expected 4/1/2027 End of Life	Mfr. Part No. CPC1973Y Mouser Part No 849-CPC1973Y End of Life	IXYS Integrated Circuits	Triac & SCR Output Optocouplers 400V Single Pole SIP Power Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	96In Stock 100Expected 4/1/2027	CHF 8.52 CHF 7.01 CHF 6.26 CHF 5.86 View CHF 5.68 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount 1000V Single Pole SIP Power Relay CPC1981Y IXYS Integrated Circuits 1: CHF 7.02 29In Stock 2’925Expected 12/20/2027 End of Life	Mfr. Part No. CPC1981Y Mouser Part No 849-CPC1981Y End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1000V Single Pole SIP Power Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	29In Stock 2’925Expected 12/20/2027	CHF 7.02 CHF 6.42 CHF 5.93 CHF 5.73 View CHF 5.53 CHF 5.29	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SP-NO SS OptoMOS Power Relay CPC1983B IXYS Integrated Circuits 1: CHF 9.58 150In Stock End of Life	Mfr. Part No. CPC1983B Mouser Part No 849-CPC1983B End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount SP-NO SS OptoMOS Power Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	150In Stock	CHF 9.58 CHF 8.98 CHF 7.97 CHF 7.57 View CHF 6.56 CHF 6.32 CHF 6.22 CHF 6.16	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount 600V AC/DC 1-FORM-A ENHANCED ISO PSIP CPC1984Y IXYS Integrated Circuits 1: CHF 14.73 13In Stock End of Life	Mfr. Part No. CPC1984Y Mouser Part No 849-CPC1984Y End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 600V AC/DC 1-FORM-A ENHANCED ISO PSIP Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	13In Stock	CHF 14.73 CHF 13.11 CHF 12.49 CHF 11.93 CHF 10.38	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount 100V 300mA Double Pole Relay LAA108 IXYS Integrated Circuits 1: CHF 4.42 295In Stock End of Life	Mfr. Part No. LAA108 Mouser Part No 849-LAA108 End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 100V 300mA Double Pole Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	295In Stock	CHF 4.42 CHF 3.95 CHF 3.76 CHF 3.63 View CHF 3.49 CHF 3.33 CHF 3.22 CHF 3.00 CHF 2.99	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount 100V 300mA Double Pole Relay LAA108S IXYS Integrated Circuits 1: CHF 4.54 3In Stock End of Life	Mfr. Part No. LAA108S Mouser Part No 849-LAA108S End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 100V 300mA Double Pole Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	3In Stock	CHF 4.54 CHF 4.15 CHF 3.82 CHF 3.65 View CHF 3.49 CHF 3.33 CHF 3.07	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount 350V 120mA Dual Single-Pole LAA110LS IXYS Integrated Circuits 1: CHF 7.41 6In Stock End of Life	Mfr. Part No. LAA110LS Mouser Part No 849-LAA110LS End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 350V 120mA Dual Single-Pole Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	6In Stock	CHF 7.41 CHF 6.81 CHF 6.65 CHF 5.48 View CHF 5.16 CHF 5.02	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount 350V 120mA Dual Single-Pole LAA110LSTR IXYS Integrated Circuits 1: CHF 7.46 698In Stock End of Life	Mfr. Part No. LAA110LSTR Mouser Part No 849-LAA110LSTR End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 350V 120mA Dual Single-Pole Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	698In Stock	Cut Tape CHF 7.46 CHF 6.65 CHF 6.36 CHF 6.13 Reel CHF 5.23 View CHF 5.92 CHF 5.61 CHF 5.42 CHF 4.93 MouseReel Available	Min.: 1 Mult.: 1 : 1’000
Solid State Relays - PCB Mount 250V 170mA Dual Single-Pole LAA120 IXYS Integrated Circuits 1: CHF 8.11 156In Stock End of Life	Mfr. Part No. LAA120 Mouser Part No 849-LAA120 End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 250V 170mA Dual Single-Pole Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	156In Stock	CHF 8.11 CHF 7.60 CHF 6.95 CHF 5.90 View CHF 4.53 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount 250V 170mA Dual Single-Pole LAA120S IXYS Integrated Circuits 1: CHF 7.46 3In Stock End of Life	Mfr. Part No. LAA120S Mouser Part No 849-LAA120S End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 250V 170mA Dual Single-Pole Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	3In Stock	CHF 7.46 CHF 6.65 CHF 6.35 CHF 6.12 View CHF 5.91 CHF 5.61 CHF 5.14 CHF 5.09	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount DUAL POLE LAA125 IXYS Integrated Circuits 1: CHF 7.46 125In Stock End of Life	Mfr. Part No. LAA125 Mouser Part No 849-LAA125 End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount DUAL POLE Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	125In Stock	CHF 7.46 CHF 6.65 CHF 6.35 CHF 6.12 View CHF 6.07 CHF 5.44 CHF 5.35 CHF 5.28 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount 250V 200mA Dual Single-Pole LAA127S IXYS Integrated Circuits 1: CHF 10.56 48In Stock End of Life	Mfr. Part No. LAA127S Mouser Part No 849-LAA127S End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 250V 200mA Dual Single-Pole Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	48In Stock	CHF 10.56 CHF 9.39 CHF 8.95 CHF 8.56 View CHF 8.20 CHF 7.48 CHF 7.36 CHF 7.24 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount DPST-NO/NO 8PIN DIP LAA710 IXYS Integrated Circuits 1: CHF 17.21 11In Stock 1’200On Order End of Life	Mfr. Part No. LAA710 Mouser Part No 849-LAA710 End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount DPST-NO/NO 8PIN DIP Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	11In Stock 1’200On Order On Order Ship Dates Mfr. No: LAA710 Stock: 11 Can Dispatch Immediately On Order: 550 Expected 11/20/2026 650 Expected 12/25/2026 Factory Lead Time: 35 Weeks	CHF 17.21 CHF 15.30 CHF 13.88 CHF 13.28 CHF 12.76	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN DIP LCA110 IXYS Integrated Circuits 1: CHF 4.02 56In Stock 17’250On Order End of Life	Mfr. Part No. LCA110 Mouser Part No 849-LCA110 End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount SPST-NO 6PIN DIP Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	56In Stock 17’250On Order On Order Ship Dates Mfr. No: LCA110 Stock: 56 Can Dispatch Immediately On Order: 9’350 Expected 3/8/2027 7’900 Expected 5/7/2027 Factory Lead Time: 36 Weeks	CHF 4.02 CHF 3.58 CHF 3.43 CHF 3.30 View CHF 3.19 CHF 3.05 CHF 2.94	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN SMD LCA110S IXYS Integrated Circuits 1: CHF 3.60 507In Stock 800Expected 4/9/2027 End of Life	Mfr. Part No. LCA110S Mouser Part No 849-LCA110S End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount SPST-NO 6PIN SMD Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	507In Stock 800Expected 4/9/2027	CHF 3.60 CHF 3.30 CHF 3.03 CHF 2.92 View CHF 2.82 CHF 2.69 CHF 2.59	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 200mA LCA127LS IXYS Integrated Circuits 1: CHF 6.52 14In Stock End of Life	Mfr. Part No. LCA127LS Mouser Part No 849-LCA127LS End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single-Pole Relay 250V 200mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	14In Stock	CHF 6.52 CHF 5.82 CHF 5.53 CHF 5.29 View CHF 5.06 CHF 4.53 CHF 4.46 CHF 4.41 CHF 4.39	Min.: 1 Mult.: 1