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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.
Solid State Relays - PCB Mount Single-Pole Relay 350V 120mA LCA110L IXYS Integrated Circuits 1: $5.69 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	$5.69 $5.30 $5.07 $4.90 View $4.73 $4.42 $4.23 $4.13 $3.73	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN DIP LCA120 IXYS Integrated Circuits 1: $8.54 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	$8.54 $8.01 $7.12 $6.76 View $6.41 $6.07 $5.86 $5.67	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA LCA120L IXYS Integrated Circuits 1: $8.07 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	$8.07 $8.02 $7.14 $6.76 View $6.24 $6.07 $5.88 $5.80 $5.79	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA LCA120LS IXYS Integrated Circuits 1: $8.63 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	$8.63 $8.10 $7.20 $6.83 View $5.95 $5.82 $5.69 $5.59 $5.56	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN SMT LCA120S IXYS Integrated Circuits 1: $8.14 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	$8.14 $7.25 $6.93 $6.68 View $5.95 $5.86 $5.77 $5.69 $5.68	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA LCA120STR IXYS Integrated Circuits 1: $8.29 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 $8.29 $7.77 $6.90 $6.57 View Reel $5.50 $6.21 $5.90 $5.69 $5.50 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount Single-Pole Relay 250V 200mA LCA127 IXYS Integrated Circuits 1: $9.92 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	$9.92 $9.30 $8.26 $7.85 View $7.44 $6.97 $6.73 $6.50	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 200mA LCA127S IXYS Integrated Circuits 1: $10.08 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	$10.08 $9.45 $8.40 $7.97 View $7.55 $7.09 $6.84 $6.60	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 # 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	$6.94 $6.51 $5.79 $5.56 View $5.37 $4.82 $4.67 $4.52	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 350V 120mA LCA182STR IXYS Integrated Circuits 1: $6.76 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 $6.76 $6.33 $5.63 $5.34 View Reel $4.52 $5.08 $4.85 $4.68 $4.52 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount SPST-NO 6PIN DIP LCA710 IXYS Integrated Circuits 1: $12.99 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	$12.99 $12.22 $10.95 $10.54 View $10.18 $9.72	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount 1-Form 30V 2000 mA Solid State Relay LCA717 IXYS Integrated Circuits 1: $12.99 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	$12.99 $11.57 $11.05 $10.66 View $10.30 $9.45 $9.18 $8.98 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single 1-Form-A 250V 50mA relay OMA160S IXYS Integrated Circuits 1: $8.71 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	$8.71 $7.76 $7.74 $7.33 View $6.83 $6.67 $6.51 $6.29	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount DPST-NO/NO 6PIN DIP PAA193 IXYS Integrated Circuits 1: $15.64 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	$15.64 $14.66 $13.04 $12.38 View $11.73 $10.73 $10.36 $10.00	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Dual 1-Form-A 600V 100mA SSR PAA193S IXYS Integrated Circuits 1: $14.22 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	$14.22 $12.68 $12.10 $11.69 View $11.28 $10.43 $10.24 $10.06 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 400V 150mA PLA110L IXYS Integrated Circuits 1: $10.80 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	$10.80 $10.13 $9.00 $8.55 View $8.10 $7.57 $7.31 $7.05	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN DIP PLA110S IXYS Integrated Circuits 1: $10.56 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	$10.56 $9.89 $8.80 $8.36 View $7.92 $7.38 $7.14 $6.89	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 400V 150mA PLA110STR IXYS Integrated Circuits 1: $9.59 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 $9.59 $9.40 Reel $6.64 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount Single-Pole Relay 60V 600mA PLA132 IXYS Integrated Circuits 1: $12.22 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	$12.22 $10.89 $10.40 $10.04 View $9.97 $9.15 $8.85 $8.74 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 60V 600mA PLA132S IXYS Integrated Circuits 1: $12.22 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	$12.22 $10.89 $10.40 $10.04 View $9.69 $9.19 $8.48 $8.39 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 400V 250mA PLA140L IXYS Integrated Circuits 1: $12.36 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	$12.36 $11.01 $10.52 $10.15 View $9.63 $9.37 $9.23 $9.10 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 800V 100mA PLA170 IXYS Integrated Circuits 1: $9.26 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	$9.26 $8.46 $7.74 $7.33 View $6.96 $6.28	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 800V 100mA PLA170S IXYS Integrated Circuits 1: $9.27 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	$9.27 $8.68 $7.72 $7.33 View $6.96 $6.55	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single Pole 1-Form-A, 250V,250mA PLA171PTR IXYS Integrated Circuits 1: $9.80 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 $9.80 $8.96 $8.31 $8.02 View Reel $6.45 $7.75 $6.93 $6.68 $6.45 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount Single-Pole Relay 400V 250mA PLA191 IXYS Integrated Circuits 1: $12.29 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	$12.29 $10.96 $10.56 $10.28 View $9.07 $8.94 $8.87	Min.: 1 Mult.: 1