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 (CLP) Filter the results in the table by unit price based on your quantity.	Qty.	Mounting Style	Package / Case	Output Type
Solid State Relays - PCB Mount SS Relay SP, NO 4-PIN SOP OptoMOS CPC1004N IXYS Integrated Circuits 1: $4.170 1.825In 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	1.825In Stock 9.000Expected 7/5/2027	$4.170 $3.725 $3.520 $3.395 View $3.293 $3.122 $3.030 $2.928	Min.: 1 Mult.: 1	PCB Mount	SOP-4	MOSFET
Solid State Relays - PCB Mount 1-Form-A 60V 750mA Solid State Relay CPC1019N IXYS Integrated Circuits 1: $4.865 2.916In Stock 4.100Expected 6/2/2027 End of Life	Mfr. Part # CPC1019N Mouser Part # 849-CPC1019N End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A 60V 750mA Solid State Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	2.916In Stock 4.100Expected 6/2/2027	$4.865 $4.386 $4.101 $3.919 View $3.771 $3.589 $3.475 $3.361 $3.349	Min.: 1 Mult.: 1	PCB Mount	SOP-4	MOSFET
Solid State Relays - PCB Mount SPST-NO 4PIN SOP CPC1230N IXYS Integrated Circuits 1: $4.284 1.328In Stock End of Life	Mfr. Part # CPC1230N Mouser Part # 849-CPC1230N 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	1.328In Stock	$4.284 $3.908 $3.589 $3.406 View $3.293 $3.133 $3.042 $2.848 $2.757	Min.: 1 Mult.: 1	PCB Mount	SOP-4	MOSFET
Solid State Relays - PCB Mount 1-Form-A 350V 120mA Solid State Relay CPC1230NTR IXYS Integrated Circuits 1: $3.965 2.149In Stock End of Life	Mfr. Part # CPC1230NTR Mouser Part # 849-CPC1230NTR 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	2.149In Stock	Cut Tape $3.965 $3.714 $3.304 $3.156 View Reel $2.723 $3.053 $2.917 $2.814 $2.723 $2.723 MouseReel Available	Min.: 1 Mult.: 1 : 2.000	PCB Mount	SOP-4	MOSFET
Solid State Relays - PCB Mount RELAY, SS ICS CPC1561BTR IXYS Integrated Circuits 1: $12.931 249In Stock 1.000Expected 7/21/2027 End of Life	Mfr. Part # CPC1561BTR Mouser Part # 849-CPC1561BTR 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	249In Stock 1.000Expected 7/21/2027	Cut Tape $12.931 $12.122 $10.778 $10.242 View Reel $8.260 $9.695 $8.875 $8.567 $8.260 MouseReel Available	Min.: 1 Mult.: 1 : 1.000	PCB Mount	SOIC-16	MOSFET
Solid State Relays - PCB Mount 1-Form-A; 60V, 4ADC 2500Vrms Isolation CPC1706Y IXYS Integrated Circuits 1: $8.396 2.313In Stock 8.875On Order End of Life	Mfr. Part # CPC1706Y Mouser Part # 849-CPC1706Y End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A; 60V, 4ADC 2500Vrms Isolation Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	2.313In Stock 8.875On Order On Order Ship Dates Mfr. #: CPC1706Y Stock: 2.313 Can Ship Immediately On Order: 3.775 Expected 3/1/2027 5.100 Expected 4/12/2027 Factory Lead-Time: 39 Weeks	$8.396 $7.679 $7.132 $6.881 View $6.653 $6.346	Min.: 1 Mult.: 1	PCB Mount	SIP-4	MOSFET
Solid State Relays - PCB Mount 60V Single Pole 60V Power Relay CPC1909J IXYS Integrated Circuits 1: $23.936 479In Stock 325Expected 12/25/2026 End of Life	Mfr. Part # CPC1909J Mouser Part # 849-CPC1909J End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 60V Single Pole 60V Power Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	479In Stock 325Expected 12/25/2026	$23.936 $22.011 $20.849 $19.698 View $18.980 $18.126 $17.499	Min.: 1 Mult.: 1	PCB Mount	ISOPLUS264	MOSFET
Triac & SCR Output Optocouplers 400V, 1mA AC Solid State Relay CPC1945G IXYS Integrated Circuits 1: $10.869 105In Stock End of Life	Mfr. Part # CPC1945G Mouser Part # 849-CPC1945G End of Life	IXYS Integrated Circuits	Triac & SCR Output Optocouplers 400V, 1mA AC Solid State Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	105In Stock	$10.869 $8.408 $6.801 $6.243 View $5.936 Quote	Min.: 1 Mult.: 1	Through Hole	DIP-16
Solid State Relays - PCB Mount 120MA DPST 8-DIP LAA110 IXYS Integrated Circuits 1: $10.983 956In Stock 5.400On Order End of Life	Mfr. Part # LAA110 Mouser Part # 849-LAA110 End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 120MA DPST 8-DIP Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	956In Stock 5.400On Order On Order Ship Dates Mfr. #: LAA110 Stock: 956 Can Ship Immediately On Order: 2.800 Expected 7/15/2027 1.050 Expected 7/19/2027 1.550 Expected 7/23/2027 Factory Lead-Time: 36 Weeks	$10.983 $10.071 $9.228 $8.818 View $8.431 $7.929	Min.: 1 Mult.: 1	PCB Mount	DIP-8	MOSFET
Solid State Relays - PCB Mount 350V 120mA Dual Single-Pole LAA110L IXYS Integrated Circuits 1: $10.709 94In Stock End of Life	Mfr. Part # LAA110L Mouser Part # 849-LAA110L 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	94In Stock	$10.709 $9.547 $9.114 $8.795 View $8.043 $7.713 $7.474 $7.303 Quote	Min.: 1 Mult.: 1	PCB Mount	DIP-8	MOSFET
Solid State Relays - PCB Mount DPST-NO/NO 8PIN DIP LAA110S IXYS Integrated Circuits 1: $10.470 1.861In Stock 100Expected 7/12/2027 End of Life	Mfr. Part # LAA110S Mouser Part # 849-LAA110S 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	1.861In Stock 100Expected 7/12/2027	$10.470 $9.331 $8.909 $8.590 View $8.294 $7.861 $7.827 Quote	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-8	MOSFET
Solid State Relays - PCB Mount 350V 170mA Dual Single-Pole LAA125LS IXYS Integrated Circuits 1: $12.088 83In Stock End of Life	Mfr. Part # LAA125LS Mouser Part # 849-LAA125LS 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	83In Stock	$12.088 $11.324 $10.071 $9.559 View $9.057 $8.294 $8.009 $7.736	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-8	MOSFET
Solid State Relays - PCB Mount 250V 200mA Dual Single-Pole LAA127LS IXYS Integrated Circuits 1: $14.309 90In Stock End of Life	Mfr. Part # LAA127LS Mouser Part # 849-LAA127LS 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	90In Stock	$14.309 $12.714 $12.088 $11.450 View $10.891 $10.402 $10.048 $9.695	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-8	MOSFET
Solid State Relays - PCB Mount 250V 200mA Dual Single-Pole LAA127STR IXYS Integrated Circuits 1: $13.170 392In Stock End of Life	Mfr. Part # LAA127STR Mouser Part # 849-LAA127STR 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	392In Stock	Cut Tape $13.170 $11.735 $11.210 $10.823 View Reel $9.433 $10.424 $9.946 $9.718 $9.433 MouseReel Available	Min.: 1 Mult.: 1 : 1.000	PCB Mount	SMD DIP-8	MOSFET
Solid State Relays - PCB Mount SPST-NO 6PIN DIP LCA120 IXYS Integrated Circuits 1: $7.485 1.019In Stock 2.150Expected 7/5/2027 End of Life	Mfr. Part # LCA120 Mouser Part # 849-LCA120 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	1.019In Stock 2.150Expected 7/5/2027	$7.485 $7.018 $6.243 $5.924 View $5.617 $5.320 $5.138 $4.967	Min.: 1 Mult.: 1	PCB Mount	DIP-6	MOSFET
Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA LCA120LS IXYS Integrated Circuits 1: $7.565 84In Stock End of Life	Mfr. Part # LCA120LS Mouser Part # 849-LCA120LS End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	84In Stock	$7.565 $7.098 $6.312 $5.981 View $5.218 $5.104 $4.990 $4.899 $4.876	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-6	MOSFET
Solid State Relays - PCB Mount SPST-NO 6PIN SMT LCA120S IXYS Integrated Circuits 1: $7.132 53In Stock End of Life	Mfr. Part # LCA120S Mouser Part # 849-LCA120S End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount SPST-NO 6PIN SMT Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	53In Stock	$7.132 $6.357 $6.072 $5.856 View $5.343 $5.241 $5.150 $5.058 $5.036	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-6	MOSFET
Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA LCA120STR IXYS Integrated Circuits 1: $6.870 1.433In Stock 2.000Expected 8/4/2027 End of Life	Mfr. Part # LCA120STR Mouser Part # 849-LCA120STR End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	1.433In Stock 2.000Expected 8/4/2027	Cut Tape $6.870 $6.129 $5.856 $5.651 Reel $4.831 View $5.457 $5.195 $5.013 $4.682 MouseReel Available	Min.: 1 Mult.: 1 : 1.000	PCB Mount	SMD DIP-6	MOSFET
Solid State Relays - PCB Mount Single-Pole Relay 250V 200mA LCA127 IXYS Integrated Circuits 1: $8.134 1.921In Stock End of Life	Mfr. Part # LCA127 Mouser Part # 849-LCA127 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	1.921In Stock	$8.134 $7.246 $6.927 $6.676 View $6.448 $6.129 $5.924 $5.719	Min.: 1 Mult.: 1	PCB Mount	DIP-6	MOSFET
Solid State Relays - PCB Mount Single-Pole Relay 250V 200mA LCA127S IXYS Integrated Circuits 1: $8.829 93In Stock End of Life	Mfr. Part # LCA127S Mouser Part # 849-LCA127S 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	93In Stock	$8.829 $8.283 $7.360 $6.984 View $6.619 $6.209 $5.993 $5.788	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-6	MOSFET
Solid State Relays - PCB Mount SPST-NO 6PIN DIP LCA182 IXYS Integrated Circuits 1: $5.810 100In Stock End of Life	Mfr. Part # LCA182 Mouser Part # 849-LCA182 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	100In Stock	$5.810 $5.184 $4.956 $4.705 View $4.512 $4.306 $4.090 $3.965	Min.: 1 Mult.: 1	PCB Mount	DIP-6	MOSFET
Solid State Relays - PCB Mount Single-Pole Relay 350V 120mA LCA182STR IXYS Integrated Circuits 1: $5.674 3.383In Stock End of Life	Mfr. Part # LCA182STR Mouser Part # 849-LCA182STR End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single-Pole Relay 350V 120mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	3.383In Stock	Cut Tape $5.674 $5.058 $4.831 $4.671 Reel $3.987 View $4.489 $4.284 $4.136 $3.862 MouseReel Available	Min.: 1 Mult.: 1 : 1.000	PCB Mount	SMD DIP-6	MOSFET
Solid State Relays - PCB Mount 1-Form-A 60V 700mA Solid State Relay CPC1002N IXYS Integrated Circuits 1: $3.555 85In Stock 111.300On Order End of Life	Mfr. Part # CPC1002N Mouser Part # 849-CPC1002N 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	85In Stock 111.300On Order On Order Ship Dates Mfr. #: CPC1002N Stock: 85 Can Ship Immediately On Order: 20.100 Expected 1/22/2027 44.600 Expected 7/5/2027 46.600 Expected 7/8/2027 Factory Lead-Time: 31 Weeks	$3.555 $3.167 $3.030 $2.928 View $2.825 $2.677 $2.609	Min.: 1 Mult.: 1	PCB Mount	SOP-4	MOSFET
Solid State Relays - PCB Mount 1-Form-A 100V 150mA Solid State Relay CPC1008NTR IXYS Integrated Circuits 1: $3.452 80In Stock 88.000On Order End of Life	Mfr. Part # CPC1008NTR Mouser Part # 849-CPC1008NTR End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A 100V 150mA Solid State Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	80In Stock 88.000On Order On Order Ship Dates Mfr. #: CPC1008NTR Stock: 80 Can Ship Immediately On Order: 36.000 Expected 11/30/2026 52.000 Expected 12/25/2026 Factory Lead-Time: 31 Weeks	Cut Tape $3.452 $3.179 $2.985 $2.768 View Reel $2.279 $2.734 $2.677 $2.643 $2.279 $2.279 MouseReel Available	Min.: 1 Mult.: 1 : 2.000	PCB Mount	SOP-4	MOSFET
Solid State Relays - PCB Mount Dual 1-Form-A 100V 150mA SSR CPC1009N IXYS Integrated Circuits 1: $3.839 714In Stock 7.900On Order End of Life	Mfr. Part # CPC1009N Mouser Part # 849-CPC1009N 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	714In Stock 7.900On Order On Order Ship Dates Mfr. #: CPC1009N Stock: 714 Can Ship Immediately On Order: 5.000 Expected 2/15/2027 2.900 Expected 3/11/2027 Factory Lead-Time: 36 Weeks	$3.839 $3.429 $3.270 $3.156 View $3.053 $2.791 $2.643	Min.: 1 Mult.: 1	PCB Mount	SOP-4	MOSFET