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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 (PEN) Filter the results in the table by unit price based on your quantity.	Qty.
Solid State Relays - PCB Mount Single-Pole Relay 350V 120mA LCA110L IXYS Integrated Circuits 1: S/ 17.05 1,116In Stock End of Life	Mfr. Part # LCA110L Mouser Part # 849-LCA110L 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	1,116In Stock	S/ 17.05 S/ 15.88 S/ 15.18 S/ 14.67 View S/ 14.17 S/ 13.23 S/ 12.65 S/ 12.38 S/ 11.17	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN DIP LCA120 IXYS Integrated Circuits 1: S/ 25.57 2,469In Stock 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	2,469In Stock	S/ 25.57 S/ 23.98 S/ 21.33 S/ 20.24 View S/ 19.19 S/ 18.18 S/ 17.56 S/ 16.97	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA LCA120L IXYS Integrated Circuits 1: S/ 24.17 85In Stock End of Life	Mfr. Part # LCA120L Mouser Part # 849-LCA120L 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	85In Stock	S/ 24.17 S/ 24.02 S/ 21.37 S/ 20.24 View S/ 19.11 S/ 18.72 S/ 18.45 S/ 18.14 S/ 18.06	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA LCA120LS IXYS Integrated Circuits 1: S/ 25.85 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	S/ 25.85 S/ 24.25 S/ 21.56 S/ 20.44 View S/ 17.83 S/ 17.44 S/ 17.05 S/ 16.74 S/ 16.66	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN SMT LCA120S IXYS Integrated Circuits 1: S/ 24.37 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	S/ 24.37 S/ 21.72 S/ 20.75 S/ 20.01 View S/ 18.26 S/ 17.91 S/ 17.59 S/ 17.28 S/ 17.20	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA LCA120STR IXYS Integrated Circuits 1: S/ 23.47 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 S/ 23.47 S/ 20.94 S/ 20.01 S/ 19.31 Reel S/ 16.50 View S/ 18.65 S/ 17.75 S/ 17.13 S/ 16.00 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount Single-Pole Relay 250V 200mA LCA127 IXYS Integrated Circuits 1: S/ 27.79 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	S/ 27.79 S/ 24.76 S/ 23.67 S/ 22.81 View S/ 22.03 S/ 20.94 S/ 20.24 S/ 19.54	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 200mA LCA127S IXYS Integrated Circuits 1: S/ 30.17 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	S/ 30.17 S/ 28.30 S/ 25.15 S/ 23.86 View S/ 22.62 S/ 21.21 S/ 20.47 S/ 19.77	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN DIP LCA182 IXYS Integrated Circuits 1: S/ 19.85 150In 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	150In Stock	S/ 19.85 S/ 17.71 S/ 16.93 S/ 16.08 View S/ 15.41 S/ 14.71 S/ 13.97 S/ 13.55	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 350V 120mA LCA182STR IXYS Integrated Circuits 1: S/ 19.38 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 S/ 19.38 S/ 17.28 S/ 16.50 S/ 15.96 Reel S/ 13.62 View S/ 15.34 S/ 14.64 S/ 14.13 S/ 13.20 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount SPST-NO 6PIN DIP LCA710 IXYS Integrated Circuits 1: S/ 38.77 23In Stock 10,050On Order	Mfr. Part # LCA710 Mouser Part # 849-LCA710	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	23In Stock 10,050On Order On Order Ship Dates Mfr. #: LCA710 Stock: 23 Can Ship Immediately On Order: 5,150 Expected 11/2/2026 4,900 Expected 2/10/2027 Factory Lead-Time: 35 Weeks	S/ 38.77 S/ 36.43 S/ 32.66 S/ 31.06 View S/ 29.89 S/ 28.53	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount 1-Form 30V 2000 mA Solid State Relay LCA717 IXYS Integrated Circuits 1: S/ 38.89 201In Stock 300Expected 11/2/2026	Mfr. Part # LCA717 Mouser Part # 849-LCA717	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	201In Stock 300Expected 11/2/2026	S/ 38.89 S/ 34.64 S/ 33.09 S/ 31.92 View S/ 30.83 S/ 28.30 S/ 27.48 S/ 26.90 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single 1-Form-A 250V 50mA relay OMA160S IXYS Integrated Circuits 1: S/ 26.08 72In Stock	Mfr. Part # OMA160S Mouser Part # 849-OMA160S	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single 1-Form-A 250V 50mA relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	72In Stock	S/ 26.08 S/ 23.24 S/ 23.16 S/ 21.95 View S/ 20.44 S/ 19.97 S/ 19.50 S/ 18.84	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount DPST-NO/NO 6PIN DIP PAA193 IXYS Integrated Circuits 1: S/ 42.58 91In Stock	Mfr. Part # PAA193 Mouser Part # 849-PAA193	IXYS Integrated Circuits	Solid State Relays - PCB Mount DPST-NO/NO 6PIN DIP Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	91In Stock	S/ 42.58 S/ 37.95 S/ 36.24 S/ 34.99 View S/ 33.79 S/ 32.19 S/ 29.43 S/ 28.96	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Dual 1-Form-A 600V 100mA SSR PAA193S IXYS Integrated Circuits 1: S/ 42.58 153In Stock 50Expected 1/7/2027	Mfr. Part # PAA193S Mouser Part # 849-PAA193S	IXYS Integrated Circuits	Solid State Relays - PCB Mount Dual 1-Form-A 600V 100mA SSR Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	153In Stock 50Expected 1/7/2027	S/ 42.58 S/ 37.95 S/ 36.24 S/ 34.99 View S/ 33.79 S/ 31.22 S/ 30.67 S/ 30.13 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 400V 150mA PLA110L IXYS Integrated Circuits 1: S/ 30.09 61In Stock	Mfr. Part # PLA110L Mouser Part # 849-PLA110L	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	61In Stock	S/ 30.09 S/ 26.82 S/ 25.61 S/ 24.72 View S/ 23.86 S/ 21.64 S/ 21.37 S/ 21.14 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN DIP PLA110S IXYS Integrated Circuits 1: S/ 31.61 45In Stock 250Expected 7/5/2027	Mfr. Part # PLA110S Mouser Part # 849-PLA110S	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	45In Stock 250Expected 7/5/2027	S/ 31.61 S/ 29.62 S/ 26.35 S/ 25.03 View S/ 23.71 S/ 22.11 S/ 21.37 S/ 20.63	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 400V 150mA PLA110STR IXYS Integrated Circuits 1: S/ 28.73 108In Stock 3,000On Order	Mfr. Part # PLA110STR Mouser Part # 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	108In Stock 3,000On Order On Order Ship Dates Mfr. #: PLA110STR Stock: 108 Can Ship Immediately On Order: 1,000 Expected 1/27/2027 2,000 Expected 3/22/2027 Factory Lead-Time: 36 Weeks	Cut Tape S/ 28.73 S/ 28.14 Reel S/ 19.89 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount Single-Pole Relay 60V 600mA PLA132 IXYS Integrated Circuits 1: S/ 36.59 113In Stock	Mfr. Part # PLA132 Mouser Part # 849-PLA132	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single-Pole Relay 60V 600mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	113In Stock	S/ 36.59 S/ 32.62 S/ 31.14 S/ 30.05 View S/ 29.86 S/ 27.40 S/ 26.90 S/ 26.62 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 60V 600mA PLA132S IXYS Integrated Circuits 1: S/ 36.59 66In Stock	Mfr. Part # PLA132S Mouser Part # 849-PLA132S	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single-Pole Relay 60V 600mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	66In Stock	S/ 36.59 S/ 32.62 S/ 31.14 S/ 30.05 View S/ 29.00 S/ 27.52 S/ 25.38 S/ 25.11 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 400V 250mA PLA140L IXYS Integrated Circuits 1: S/ 37.02 38In Stock 100Expected 6/3/2027	Mfr. Part # PLA140L Mouser Part # 849-PLA140L	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single-Pole Relay 400V 250mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	38In Stock 100Expected 6/3/2027	S/ 37.02 S/ 32.97 S/ 31.49 S/ 30.40 View S/ 28.84 S/ 28.06 S/ 27.64 S/ 27.25 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 800V 100mA PLA170 IXYS Integrated Circuits 1: S/ 27.71 10In Stock 400Expected 7/29/2027	Mfr. Part # PLA170 Mouser Part # 849-PLA170	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single-Pole Relay 800V 100mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	10In Stock 400Expected 7/29/2027	S/ 27.71 S/ 25.34 S/ 23.16 S/ 21.95 View S/ 20.82 S/ 18.80	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 800V 100mA PLA170S IXYS Integrated Circuits 1: S/ 27.79 15In Stock 1,250On Order	Mfr. Part # PLA170S Mouser Part # 849-PLA170S	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single-Pole Relay 800V 100mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	15In Stock 1,250On Order On Order Ship Dates Mfr. #: PLA170S Stock: 15 Can Ship Immediately On Order: 700 Expected 11/16/2026 550 Expected 11/23/2026 Factory Lead-Time: 36 Weeks	S/ 27.79 S/ 26.04 S/ 22.27 S/ 21.45 View S/ 20.71 S/ 19.77	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single Pole 1-Form-A, 250V,250mA PLA171PTR IXYS Integrated Circuits 1: S/ 29.35 132In Stock 1,000Expected 6/28/2027	Mfr. Part # PLA171PTR Mouser Part # 849-PLA171PTR	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single Pole 1-Form-A, 250V,250mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	132In Stock 1,000Expected 6/28/2027	Cut Tape S/ 29.35 S/ 26.82 S/ 24.87 S/ 24.02 View Reel S/ 19.77 S/ 23.20 S/ 21.37 S/ 20.63 S/ 19.77 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount Single-Pole Relay 400V 250mA PLA191 IXYS Integrated Circuits 1: S/ 36.78 24In Stock	Mfr. Part # PLA191 Mouser Part # 849-PLA191	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single-Pole Relay 400V 250mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	24In Stock	S/ 36.78 S/ 32.81 S/ 31.61 S/ 30.79 View S/ 27.33 S/ 26.98 S/ 26.78 Quote	Min.: 1 Mult.: 1