Optocouplers / Photocouplers

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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 (USD) Filter the results in the table by unit price based on your quantity.	Qty.	Mounting Style	Package / Case	Output Type
Triac & SCR Output Optocouplers 400V Single Pole SIP Power Relay CPC1973Y IXYS Integrated Circuits 1: $10.25 116In Stock 100Expected 4/1/2027 End of Life	Mfr. Part # CPC1973Y Mouser Part # 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	116In Stock 100Expected 4/1/2027	$10.25 $8.43 $7.53 $7.05 View $6.84 Quote	Min.: 1 Mult.: 1	Through Hole	Power SIP
Solid State Relays - PCB Mount SP-NO SS OptoMOS Power Relay CPC1983B IXYS Integrated Circuits 1: $11.52 150In Stock End of Life	Mfr. Part # CPC1983B Mouser Part # 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	$11.52 $10.80 $9.59 $9.11 View $7.89 $7.60 $7.48 $7.41	Min.: 1 Mult.: 1	PCB Mount		MOSFET
Solid State Relays - PCB Mount 100V 300mA Double Pole Relay LAA108 IXYS Integrated Circuits 1: $5.32 295In Stock End of Life	Mfr. Part # LAA108 Mouser Part # 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	$5.32 $4.75 $4.53 $4.37 View $4.20 $4.01 $3.87 $3.61 $3.59	Min.: 1 Mult.: 1	PCB Mount	DIP-8	MOSFET
Solid State Relays - PCB Mount 100V 300mA Double Pole Relay LAA108S IXYS Integrated Circuits 1: $5.46 3In Stock End of Life	Mfr. Part # LAA108S Mouser Part # 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	$5.46 $4.99 $4.60 $4.39 View $4.20 $4.01 $3.69	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-8	MOSFET
Solid State Relays - PCB Mount 350V 120mA Dual Single-Pole LAA110LS IXYS Integrated Circuits 1: $8.92 6In Stock End of Life	Mfr. Part # LAA110LS Mouser Part # 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	$8.92 $8.20 $8.00 $6.59 View $6.20 $6.04	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-8	MOSFET
Solid State Relays - PCB Mount 250V 170mA Dual Single-Pole LAA120 IXYS Integrated Circuits 1: $9.75 156In Stock End of Life	Mfr. Part # LAA120 Mouser Part # 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	$9.75 $9.14 $8.37 $7.10 View $5.45 Quote	Min.: 1 Mult.: 1	PCB Mount	DIP-8	MOSFET
Solid State Relays - PCB Mount 250V 170mA Dual Single-Pole LAA120S IXYS Integrated Circuits 1: $9.51 3In Stock End of Life	Mfr. Part # LAA120S Mouser Part # 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	$9.51 $8.48 $8.10 $7.76 View $6.72 $6.58 $6.45 $6.41 Quote	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-8	MOSFET
Solid State Relays - PCB Mount DUAL POLE LAA125 IXYS Integrated Circuits 1: $8.97 125In Stock End of Life	Mfr. Part # LAA125 Mouser Part # 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	$8.97 $8.00 $7.64 $7.37 View $7.30 $6.54 $6.44 $6.35 Quote	Min.: 1 Mult.: 1	PCB Mount	DIP-8	MOSFET
Solid State Relays - PCB Mount 350V 170mA Dual Single-Pole LAA125S IXYS Integrated Circuits 1: $8.97 62In Stock 100Expected 10/30/2026 End of Life	Mfr. Part # LAA125S Mouser Part # 849-LAA125S End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 350V 170mA Dual Single-Pole Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	62In Stock 100Expected 10/30/2026	$8.97 $8.12 $7.71 $6.60 View $6.35 $6.21 $6.08	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-8	MOSFET
Solid State Relays - PCB Mount 250V 200mA Dual Single-Pole LAA127S IXYS Integrated Circuits 1: $12.70 48In Stock End of Life	Mfr. Part # LAA127S Mouser Part # 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	$12.70 $11.30 $10.77 $10.29 View $9.87 $9.00 $8.85 $8.70 Quote	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-8	MOSFET
Solid State Relays - PCB Mount DPST-NO/NO 8PIN DIP LAA710 IXYS Integrated Circuits 1: $20.03 11In Stock 1,200On Order End of Life	Mfr. Part # LAA710 Mouser Part # 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. #: LAA710 Stock: 11 Can Ship Immediately On Order: 550 Expected 11/20/2026 650 Expected 6/29/2027 Factory Lead-Time: 35 Weeks	$20.03 $17.82 $16.98 $16.22 $13.78	Min.: 1 Mult.: 1	PCB Mount	DIP-8	MOSFET
Solid State Relays - PCB Mount SPST-NO 6PIN DIP LCA110 IXYS Integrated Circuits 1: $4.56 56In Stock 17,250On Order End of Life	Mfr. Part # LCA110 Mouser Part # 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. #: LCA110 Stock: 56 Can Ship Immediately On Order: 9,350 Expected 3/8/2027 7,900 Expected 5/7/2027 Factory Lead-Time: 36 Weeks	$4.56 $4.07 $3.89 $3.75 View $3.63 $3.46 $3.34	Min.: 1 Mult.: 1	PCB Mount	DIP-6	MOSFET
Solid State Relays - PCB Mount SPST-NO 6PIN SMD LCA110S IXYS Integrated Circuits 1: $4.34 507In Stock 800Expected 4/9/2027 End of Life	Mfr. Part # LCA110S Mouser Part # 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	$4.34 $3.97 $3.65 $3.51 View $3.39 $3.23 $3.03	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-6	MOSFET
Solid State Relays - PCB Mount Single-Pole Relay 250V 200mA LCA127LS IXYS Integrated Circuits 1: $7.85 14In Stock End of Life	Mfr. Part # LCA127LS Mouser Part # 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	$7.85 $7.00 $6.65 $6.36 View $6.09 $5.45 $5.37 $5.30 Quote	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-6	MOSFET
Solid State Relays - PCB Mount 1-Form-A 60V 700mA Solid State Relay CPC1002NTR IXYS Integrated Circuits 1: $2.73 200,903On Order End of Life	Mfr. Part # CPC1002NTR Mouser Part # 849-CPC1002NTR End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A 60V 700mA Solid State Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	200,903On Order On Order Ship Dates Mfr. #: CPC1002NTR Stock: 0 On Order: 56,903 Expected 1/20/2027 64,000 Expected 2/18/2027 80,000 Expected 3/12/2027 Factory Lead-Time: 31 Weeks	Cut Tape $2.73 $2.72 $1.80 Reel $1.80 MouseReel Available	Min.: 1 Mult.: 1 : 2,000	PCB Mount	SOP-4	MOSFET
Solid State Relays - PCB Mount SS Relay SP, NO 4-PIN SOP OptoMOS CPC1004N IXYS Integrated Circuits 1: $3.66 6,600In Stock 9,000Expected 7/5/2027 End of Life	Mfr. Part # CPC1004N Mouser Part # 849-CPC1004N End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount SS Relay SP, NO 4-PIN SOP OptoMOS Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	6,600In Stock 9,000Expected 7/5/2027	$3.66 $3.27 $3.09 $2.98 View $2.89 $2.74 $2.66 $2.57	Min.: 1 Mult.: 1	PCB Mount	SOP-4	MOSFET
Solid State Relays - PCB Mount 1-Form-A 100V 300mA Solid State Relay CPC1004NTR IXYS Integrated Circuits 1: $3.64 8,186On Order End of Life	Mfr. Part # CPC1004NTR Mouser Part # 849-CPC1004NTR End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A 100V 300mA Solid State Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	8,186On Order On Order Ship Dates Mfr. #: CPC1004NTR Stock: 0 On Order: 2,186 Expected 1/13/2027 6,000 Expected 7/30/2027 Factory Lead-Time: 36 Weeks	Cut Tape $3.64 $3.31 $3.07 $2.95 View Reel $2.39 $2.85 $2.72 $2.63 $2.54 $2.39 MouseReel Available	Min.: 1 Mult.: 1 : 2,000	PCB Mount	SOP-4	MOSFET
Solid State Relays - PCB Mount 1-Form-A 400V 120mA Solid State Relay CPC1225NTR IXYS Integrated Circuits 1: $3.57 9,920Expected 8/12/2027 End of Life	Mfr. Part # CPC1225NTR Mouser Part # 849-CPC1225NTR End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A 400V 120mA Solid State Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	9,920Expected 8/12/2027	Cut Tape $3.57 $3.53 Reel $2.41 MouseReel Available	Min.: 1 Mult.: 1 : 2,000	PCB Mount	SOP-4	MOSFET
Solid State Relays - PCB Mount 1-Form-A 60V 600mA Solid State Relay CPC1560GS IXYS Integrated Circuits 1: $8.36 3,298On Order End of Life	Mfr. Part # CPC1560GS Mouser Part # 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	3,298On Order On Order Ship Dates Mfr. #: CPC1560GS Stock: 0 On Order: 998 Expected 11/9/2026 1,000 Expected 12/8/2027 1,300 Expected 12/9/2027 Factory Lead-Time: 54 Weeks	$8.36 $7.84 $6.97 $6.62 View $6.27 $5.85	Min.: 1 Mult.: 1	PCB Mount		MOSFET
Solid State Relays - PCB Mount SPST i4-PAC 600V CPC1977J IXYS Integrated Circuits 1: $22.77 1,483On Order End of Life	Mfr. Part # CPC1977J Mouser Part # 849-CPC1977J End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount SPST i4-PAC 600V Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	1,483On Order On Order Ship Dates Mfr. #: CPC1977J Stock: 0 On Order: 8 Expected 1/25/2027 1,475 TBD Factory Lead-Time: 54 Weeks	$22.77 $20.34 $19.41 $18.70 $16.00	Min.: 1 Mult.: 1	PCB Mount	ISOPLUS264	MOSFET
Solid State Relays - PCB Mount SPST-NO 4PIN SOP CPC1978J IXYS Integrated Circuits 1: $25.48 860On Order End of Life	Mfr. Part # CPC1978J Mouser Part # 849-CPC1978J End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount SPST-NO 4PIN SOP Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	860On Order On Order Ship Dates Mfr. #: CPC1978J Stock: 0 On Order: 535 Expected 1/13/2027 325 Expected 3/31/2027 Factory Lead-Time: 54 Weeks	$25.48 $23.42 $22.19 $20.96	Min.: 1 Mult.: 1	PCB Mount	ISOPLUS264	MOSFET
Solid State Relays - PCB Mount SPST iso PLUS-264 CPC1979J IXYS Integrated Circuits 1: $40.22 6,034On Order End of Life	Mfr. Part # CPC1979J Mouser Part # 849-CPC1979J End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount SPST iso PLUS-264 Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	6,034On Order On Order Ship Dates Mfr. #: CPC1979J Stock: 0 On Order: 5,809 Expected 12/10/2027 225 Expected 12/16/2027 Factory Lead-Time: 73 Weeks	$40.22 $35.97 $34.28 $33.03	Min.: 1 Mult.: 1	PCB Mount	ISOPLUS264	MOSFET
Solid State Relays - PCB Mount 1-Form-A; 600V,0.5A 2500Vrms Isolation CPC1983Y IXYS Integrated Circuits 1: $10.73 7,435On Order End of Life	Mfr. Part # CPC1983Y Mouser Part # 849-CPC1983Y End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A; 600V,0.5A 2500Vrms Isolation Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	7,435On Order On Order Ship Dates Mfr. #: CPC1983Y Stock: 0 On Order: 5,510 Expected 7/29/2027 1,925 Expected 8/5/2027 Factory Lead-Time: 40 Weeks	$10.73 $9.83 $9.03 $8.64 View $8.13 $7.76	Min.: 1 Mult.: 1	PCB Mount	SIP-4	MOSFET
Solid State Relays - PCB Mount RELAY, SS ICS CPC1983YE IXYS Integrated Circuits 1: $10.95 12,866On Order End of Life	Mfr. Part # CPC1983YE Mouser Part # 849-CPC1983YE End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount RELAY, SS ICS Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	12,866On Order On Order Ship Dates Mfr. #: CPC1983YE Stock: 0 On Order: 7,016 Expected 11/18/2026 5,850 Expected 1/29/2027 Factory Lead-Time: 37 Weeks	$10.95 $10.19 $9.32 $9.00 View $8.69 $8.30	Min.: 1 Mult.: 1	PCB Mount	SIP-4	MOSFET
Solid State Relays - PCB Mount 100V 300mA Double Pole Relay LAA108STR IXYS Integrated Circuits 1: $5.32 7,000On Order End of Life	Mfr. Part # LAA108STR Mouser Part # 849-LAA108STR 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	7,000On Order On Order Ship Dates Mfr. #: LAA108STR Stock: 0 On Order: 5,000 Expected 7/28/2027 2,000 Expected 7/30/2027 Factory Lead-Time: 36 Weeks	Cut Tape $5.32 $4.81 $4.44 $4.21 View Reel $3.49 $4.01 $3.83 $3.70 $3.49 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	PCB Mount	SMD DIP-8	MOSFET