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	Number of Channels	Output Type
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 No. CPC1004NTR Mouser Part No 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. No: CPC1004NTR Stock: 0 On Order: 2,186 Expected 13/01/2027 6,000 Expected 30/07/2027 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 12/08/2027 End of Life	Mfr. Part No. CPC1225NTR Mouser Part No 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 12/08/2027	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 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	3,298On Order On Order Ship Dates Mfr. No: CPC1560GS Stock: 0 On Order: 998 Expected 08/12/2027 1,300 Expected 09/12/2027 1,000 Expected 29/12/2027 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-NO 4PIN SOP CPC1978J IXYS Integrated Circuits 1: $25.48 860On Order End of Life	Mfr. Part No. CPC1978J Mouser Part No 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. No: CPC1978J Stock: 0 On Order: 535 Expected 13/01/2027 325 Expected 31/03/2027 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 No. CPC1979J Mouser Part No 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. No: CPC1979J Stock: 0 On Order: 5,809 Expected 10/12/2027 225 Expected 16/12/2027 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 No. CPC1983Y Mouser Part No 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. No: CPC1983Y Stock: 0 On Order: 5,510 Expected 29/07/2027 1,925 Expected 05/08/2027 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 No. CPC1983YE Mouser Part No 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. No: CPC1983YE Stock: 0 On Order: 7,016 Expected 18/11/2026 5,850 Expected 29/01/2027 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 No. LAA108STR Mouser Part No 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. No: LAA108STR Stock: 0 On Order: 5,000 Expected 28/07/2027 2,000 Expected 30/07/2027 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
Triac & SCR Output Optocouplers AC SS Power Switch Dual Power SCR Out CPC1976YX6 IXYS Integrated Circuits 1: $10.60 455Expected 22/02/2027	Mfr. Part No. CPC1976YX6 Mouser Part No 849-CPC1976YX6	IXYS Integrated Circuits	Triac & SCR Output Optocouplers AC SS Power Switch Dual Power SCR Out Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	455Expected 22/02/2027	$10.60 $8.65 $7.49 $7.01 View $6.77 Quote	Min.: 1 Mult.: 1	Through Hole		1 Channel	PhotoSCR
Solid State Relays - PCB Mount 1-Form-A SSR LCA701 IXYS Integrated Circuits 1: $11.88 707On Order	Mfr. Part No. LCA701 Mouser Part No 849-LCA701	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A SSR Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	707On Order On Order Ship Dates Mfr. No: LCA701 Stock: 0 On Order: 107 Expected 16/11/2026 600 Expected 15/07/2027 Factory Lead Time: 36 Weeks	$11.88 $10.44 $9.95 $9.51 View $9.07 $8.12	Min.: 1 Mult.: 1	PCB Mount			MOSFET
Solid State Relays - PCB Mount Single Pole OptoMOS 1-Form-A, 60V, 1A LCA710R IXYS Integrated Circuits 1: $9.99 946Expected 02/12/2026	Mfr. Part No. LCA710R Mouser Part No 849-LCA710R	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single Pole OptoMOS 1-Form-A, 60V, 1A Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	946Expected 02/12/2026	$9.99 $9.40 $8.42 $8.01 View $7.68 $7.33	Min.: 1 Mult.: 1	PCB Mount			MOSFET
Solid State Relays - PCB Mount 1-Form-A 60V 1000 mA SSR w/optic MOSFET LCA712STR IXYS Integrated Circuits 1: $11.24 Lead-Time 36 Weeks	Mfr. Part No. LCA712STR Mouser Part No 849-LCA712STR	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A 60V 1000 mA SSR w/optic MOSFET Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	Lead-Time 36 Weeks	Cut Tape $11.24 $10.02 $9.57 $9.22 View Reel $7.50 $8.83 $8.25 $7.97 $7.50 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	PCB Mount			MOSFET
Solid State Relays - PCB Mount 1-Form 30V 2000 mA Solid State Relay LCA717S IXYS Integrated Circuits 1: $10.92 2,080Expected 23/10/2026	Mfr. Part No. LCA717S Mouser Part No 849-LCA717S	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form 30V 2000 mA Solid State Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	2,080Expected 23/10/2026	$10.92 $10.23 $9.09 $8.64 View $8.19 $7.48 $7.23 $6.98	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-6		MOSFET
Solid State Relays - PCB Mount DPST-NO/NO 8PIN DIP PAA110 IXYS Integrated Circuits 1: $14.31 485On Order	Mfr. Part No. PAA110 Mouser Part No 849-PAA110	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	485On Order On Order Ship Dates Mfr. No: PAA110 Stock: 0 On Order: 85 Expected 13/01/2027 400 Expected 17/05/2027 Factory Lead Time: 35 Weeks	$14.31 $12.72 $12.09 $11.24 $10.85	Min.: 1 Mult.: 1	PCB Mount	DIP-8		MOSFET
Solid State Relays - PCB Mount Dual 1-Form-A 250V 250mA SSR PAA150 IXYS Integrated Circuits 1: $14.22 192On Order	Mfr. Part No. PAA150 Mouser Part No 849-PAA150	IXYS Integrated Circuits	Solid State Relays - PCB Mount Dual 1-Form-A 250V 250mA SSR Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	192On Order On Order Ship Dates Mfr. No: PAA150 Stock: 0 On Order: 92 Expected 24/05/2027 100 Expected 19/07/2027 Factory Lead Time: 36 Weeks	$14.22 $12.65 $12.05 $11.41 $11.02	Min.: 1 Mult.: 1	PCB Mount	DIP-8		MOSFET
Solid State Relays - PCB Mount Dual 1-Form-A 400V 250mA SSR PAA191S IXYS Integrated Circuits 1: $14.64 712Expected 08/02/2027	Mfr. Part No. PAA191S Mouser Part No 849-PAA191S	IXYS Integrated Circuits	Solid State Relays - PCB Mount Dual 1-Form-A 400V 250mA SSR Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	712Expected 08/02/2027	$14.64 $13.05 $12.46 $12.01 View $11.60 $11.07	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-8		MOSFET
Solid State Relays - PCB Mount Single-Pole Relay 400V 150mA PLA110STR IXYS Integrated Circuits 1: $7.38 2,996Expected 08/02/2027	Mfr. Part No. PLA110STR Mouser Part No 849-PLA110STR	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single-Pole Relay 400V 150mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	2,996Expected 08/02/2027	Cut Tape $7.38 $7.23 Reel $5.11 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	PCB Mount	SMD DIP-6		MOSFET
Solid State Relays - PCB Mount Single-Pole Relay 600V 150mA PLA192S IXYS Integrated Circuits 1: $7.08 1,825Expected 08/02/2027	Mfr. Part No. PLA192S Mouser Part No 849-PLA192S	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single-Pole Relay 600V 150mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	1,825Expected 08/02/2027	$7.08 $6.31 $6.03 $5.82 View $5.62 $5.37	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-6		MOSFET
Solid State Relays - PCB Mount Dual 1-Form-A 100V 150mA SSR CPC1009NTR IXYS Integrated Circuits 1: $3.03 7,741On Order End of Life	Mfr. Part No. CPC1009NTR Mouser Part No 849-CPC1009NTR End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount Dual 1-Form-A 100V 150mA SSR Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	7,741On Order On Order Ship Dates Mfr. No: CPC1009NTR Stock: 0 On Order: 5,741 Expected 24/05/2027 2,000 Expected 02/08/2027 Factory Lead Time: 36 Weeks	Cut Tape $3.03 $2.76 $2.54 $2.46 View Reel $1.96 $2.38 $2.28 $2.18 $1.96 $1.96 MouseReel Available	Min.: 1 Mult.: 1 : 2,000	PCB Mount	SOP-4		MOSFET
Solid State Relays - PCB Mount SPST-NO 4PIN SOP CPC1030N IXYS Integrated Circuits 1: $3.94 1,817Expected 19/04/2027 End of Life	Mfr. Part No. CPC1030N Mouser Part No 849-CPC1030N 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	1,817Expected 19/04/2027	$3.94 $3.51 $3.36 $3.23 View $3.11 $2.95 $2.87 $2.77	Min.: 1 Mult.: 1	PCB Mount	SOP-4		MOSFET
Solid State Relays - PCB Mount 1-Form-A 350V 120mA Solid State Relay CPC1030NTR IXYS Integrated Circuits 1: $3.81 3,731Expected 08/03/2027 End of Life	Mfr. Part No. CPC1030NTR Mouser Part No 849-CPC1030NTR End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A 350V 120mA Solid State Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	3,731Expected 08/03/2027	Cut Tape $3.81 $3.49 $3.21 $3.10 View Reel $2.60 $2.98 $2.84 $2.75 $2.65 $2.60 MouseReel Available	Min.: 1 Mult.: 1 : 2,000	PCB Mount	SOP-4		MOSFET
Solid State Relays - PCB Mount Single Pole Relay 400V 140mA CPC1390GR IXYS Integrated Circuits 1: $4.57 600On Order End of Life	Mfr. Part No. CPC1390GR Mouser Part No 849-CPC1390GR End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single Pole Relay 400V 140mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	600On Order On Order Ship Dates Mfr. No: CPC1390GR Stock: 0 On Order: 500 Expected 04/11/2026 100 Expected 02/12/2026 Factory Lead Time: 36 Weeks	$4.57 $4.12 $3.85 $3.69 View $3.54 $3.38	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-4		MOSFET
Solid State Relays - PCB Mount 1-Form-A; 600V,120mA 5000Vrms Isolation CPC1394G IXYS Integrated Circuits 1: $5.00 500Expected 03/02/2027 End of Life	Mfr. Part No. CPC1394G Mouser Part No 849-CPC1394G End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A; 600V,120mA 5000Vrms Isolation Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	500Expected 03/02/2027	$5.00 $4.57 $4.29 $4.14 View $4.00 $3.79 $3.69	Min.: 1 Mult.: 1	PCB Mount	DIP-4		MOSFET
Solid State Relays - PCB Mount 1-Form-A 250V 200mA Solid State Relay CPC1510GS IXYS Integrated Circuits 1: $6.94 2,502On Order End of Life	Mfr. Part No. CPC1510GS Mouser Part No 849-CPC1510GS End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A 250V 200mA Solid State Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	2,502On Order On Order Ship Dates Mfr. No: CPC1510GS Stock: 0 On Order: 1,752 Expected 14/01/2027 750 Expected 26/04/2027 Factory Lead Time: 61 Weeks	$6.94 $6.09 $5.80 $5.60 View $5.41 $5.16	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-6		MOSFET
Solid State Relays - PCB Mount SP, Normally-Open OptoMOS Relay CPC1563GS IXYS Integrated Circuits 1: $6.68 1,100Expected 15/04/2027 End of Life	Mfr. Part No. CPC1563GS Mouser Part No 849-CPC1563GS 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	1,100Expected 15/04/2027	$6.68 $6.11 $5.62 $5.32 View $5.14 $4.90	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-6		MOSFET

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