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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 (SGD) 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: $5.96 1,116In Stock End of Life	Mfr. Part No. LCA110L Mouser Part No 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	$5.96 $5.55 $5.30 $5.13 View $4.95 $4.62 $4.42 $4.32 $3.90	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN DIP LCA120 IXYS Integrated Circuits 1: $8.94 2,459In Stock End of Life	Mfr. Part No. LCA120 Mouser Part No 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	2,459In Stock	$8.94 $8.38 $7.45 $7.07 View $6.70 $6.35 $6.13 $5.93	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA LCA120L IXYS Integrated Circuits 1: $8.45 85In Stock End of Life	Mfr. Part No. LCA120L Mouser Part No 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	$8.45 $8.39 $7.47 $7.07 View $6.68 $6.54 $6.45 $6.34 $6.31	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA LCA120LS IXYS Integrated Circuits 1: $9.03 84In Stock End of Life	Mfr. Part No. LCA120LS Mouser Part No 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	$9.03 $8.47 $7.53 $7.14 View $6.23 $6.09 $5.96 $5.85 $5.82	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN SMT LCA120S IXYS Integrated Circuits 1: $8.51 53In Stock End of Life	Mfr. Part No. LCA120S Mouser Part No 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	$8.51 $7.59 $7.25 $6.99 View $6.38 $6.26 $6.15 $6.04 $6.01	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA LCA120STR IXYS Integrated Circuits 1: $8.20 1,433In Stock 2,000Expected 4/8/2027 End of Life	Mfr. Part No. LCA120STR Mouser Part No 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 4/8/2027	Cut Tape $8.20 $7.32 $6.99 $6.75 Reel $5.77 View $6.51 $6.20 $5.98 $5.59 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount Single-Pole Relay 250V 200mA LCA127 IXYS Integrated Circuits 1: $9.71 1,921In Stock End of Life	Mfr. Part No. LCA127 Mouser Part No 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	$9.71 $8.65 $8.27 $7.97 View $7.70 $7.32 $7.07 $6.83	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 200mA LCA127S IXYS Integrated Circuits 1: $10.54 93In Stock End of Life	Mfr. Part No. LCA127S Mouser Part No 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	$10.54 $9.89 $8.79 $8.34 View $7.90 $7.41 $7.15 $6.91	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN DIP LCA182 IXYS Integrated Circuits 1: $6.94 150In Stock End of Life	Mfr. Part No. LCA182 Mouser Part No 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	$6.94 $6.19 $5.92 $5.62 View $5.39 $5.14 $4.88 $4.73	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 350V 120mA LCA182STR IXYS Integrated Circuits 1: $6.77 3,383In Stock End of Life	Mfr. Part No. LCA182STR Mouser Part No 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 $6.77 $6.04 $5.77 $5.58 Reel $4.76 View $5.36 $5.11 $4.94 $4.61 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount SPST-NO 6PIN DIP LCA710 IXYS Integrated Circuits 1: $13.55 23In Stock 10,050On Order	Mfr. Part No. LCA710 Mouser Part No 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. No: LCA710 Stock: 23 Can Dispatch Immediately On Order: 5,150 Expected 2/11/2026 4,900 Expected 10/2/2027 Factory Lead Time: 35 Weeks	$13.55 $12.73 $11.41 $10.85 View $10.44 $9.97	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount 1-Form 30V 2000 mA Solid State Relay LCA717 IXYS Integrated Circuits 1: $13.59 201In Stock 300Expected 2/11/2026	Mfr. Part No. LCA717 Mouser Part No 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 2/11/2026	$13.59 $12.10 $11.56 $11.15 View $10.77 $9.89 $9.60 $9.40 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single 1-Form-A 250V 50mA relay OMA160S IXYS Integrated Circuits 1: $9.11 72In Stock	Mfr. Part No. OMA160S Mouser Part No 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	$9.11 $8.12 $8.09 $7.67 View $7.14 $6.98 $6.81 $6.58	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount DPST-NO/NO 6PIN DIP PAA193 IXYS Integrated Circuits 1: $14.88 91In Stock	Mfr. Part No. PAA193 Mouser Part No 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	$14.88 $13.26 $12.66 $12.23 View $11.80 $11.25 $10.28 $10.12	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Dual 1-Form-A 600V 100mA SSR PAA193S IXYS Integrated Circuits 1: $14.88 153In Stock 50Expected 7/1/2027	Mfr. Part No. PAA193S Mouser Part No 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 7/1/2027	$14.88 $13.26 $12.66 $12.23 View $11.80 $10.91 $10.72 $10.53 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 400V 150mA PLA110L IXYS Integrated Circuits 1: $10.51 61In Stock	Mfr. Part No. PLA110L Mouser Part No 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	$10.51 $9.37 $8.95 $8.64 View $8.34 $7.56 $7.47 $7.38 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN DIP PLA110S IXYS Integrated Circuits 1: $11.04 45In Stock 250Expected 5/7/2027	Mfr. Part No. PLA110S Mouser Part No 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 5/7/2027	$11.04 $10.35 $9.21 $8.74 View $8.28 $7.72 $7.47 $7.21	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 400V 150mA PLA110STR IXYS Integrated Circuits 1: $10.04 2,996On Order	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	2,996On Order On Order Ship Dates Mfr. No: PLA110STR Stock: 0 On Order: 996 Expected 27/1/2027 2,000 Expected 22/3/2027 Factory Lead Time: 36 Weeks	Cut Tape $10.04 $9.83 Reel $6.95 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount Single-Pole Relay 60V 600mA PLA132 IXYS Integrated Circuits 1: $12.78 113In Stock	Mfr. Part No. PLA132 Mouser Part No 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	$12.78 $11.40 $10.88 $10.50 View $10.43 $9.57 $9.40 $9.30 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 60V 600mA PLA132S IXYS Integrated Circuits 1: $12.78 66In Stock	Mfr. Part No. PLA132S Mouser Part No 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	$12.78 $11.40 $10.88 $10.50 View $10.13 $9.62 $8.87 $8.77 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 400V 250mA PLA140L IXYS Integrated Circuits 1: $12.93 38In Stock 100Expected 3/6/2027	Mfr. Part No. PLA140L Mouser Part No 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 3/6/2027	$12.93 $11.52 $11.00 $10.62 View $10.08 $9.81 $9.66 $9.52 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 800V 100mA PLA170 IXYS Integrated Circuits 1: $9.68 10In Stock 400Expected 29/7/2027	Mfr. Part No. PLA170 Mouser Part No 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 29/7/2027	$9.68 $8.85 $8.09 $7.67 View $7.28 $6.57	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 800V 100mA PLA170S IXYS Integrated Circuits 1: $9.71 15In Stock 1,250On Order	Mfr. Part No. PLA170S Mouser Part No 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. No: PLA170S Stock: 15 Can Dispatch Immediately On Order: 700 Expected 16/11/2026 550 Expected 23/11/2026 Factory Lead Time: 36 Weeks	$9.71 $9.10 $7.78 $7.49 View $7.24 $6.91	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single Pole 1-Form-A, 250V,250mA PLA171PTR IXYS Integrated Circuits 1: $10.25 132In Stock 1,000Expected 28/6/2027	Mfr. Part No. PLA171PTR Mouser Part No 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 28/6/2027	Cut Tape $10.25 $9.37 $8.69 $8.39 View Reel $6.91 $8.11 $7.47 $7.21 $6.91 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount Single-Pole Relay 400V 250mA PLA191 IXYS Integrated Circuits 1: $12.85 24In Stock	Mfr. Part No. PLA191 Mouser Part No 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	$12.85 $11.46 $11.04 $10.76 View $9.55 $9.42 $9.36 Quote	Min.: 1 Mult.: 1