.hide-partial { max-height: none; } .show-more { display: none; }

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.

All Results (277)

Search within results

In Stock

Normally Stocked

Active

New Products

RoHS Compliant

.search-refine-wrapper { display: inline-block; min-width: 100%; } .scroll-body { overflow-x: visible; } .search-table-wrapper { overflow: visible; } .hide-partial { max-height: none; } .show-more { display: none; }

Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (GBP) 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: £3.29 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	£3.29 £3.06 £2.92 £2.83 View £2.73 £2.55 £2.44 £2.38 £2.16	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN DIP LCA120 IXYS Integrated Circuits 1: £4.93 2,469In 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	2,469In Stock	£4.93 £4.63 £4.11 £3.90 View £3.70 £3.51 £3.39 £3.27	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA LCA120L IXYS Integrated Circuits 1: £4.66 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	£4.66 £4.64 £4.12 £3.90 View £3.61 £3.51 £3.40 £3.35 £3.34	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA LCA120LS IXYS Integrated Circuits 1: £4.98 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	£4.98 £4.68 £4.16 £3.95 View £3.44 £3.36 £3.29 £3.23 £3.21	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN SMT LCA120S IXYS Integrated Circuits 1: £4.70 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	£4.70 £4.19 £4.00 £3.86 View £3.44 £3.39 £3.33 £3.29 £3.28	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 170mA LCA120STR IXYS Integrated Circuits 1: £4.79 1,433In Stock 2,000Expected 04/08/2027 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 04/08/2027	Cut Tape £4.79 £4.49 £3.99 £3.79 View Reel £3.18 £3.59 £3.40 £3.29 £3.18 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount Single-Pole Relay 250V 200mA LCA127 IXYS Integrated Circuits 1: £5.73 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	£5.73 £5.37 £4.77 £4.53 View £4.30 £4.02 £3.88 £3.75	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 250V 200mA LCA127S IXYS Integrated Circuits 1: £5.82 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	£5.82 £5.46 £4.85 £4.60 View £4.37 £4.09 £3.95 £3.82	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN DIP LCA182 IXYS Integrated Circuits 1: £4.01 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	£4.01 £3.76 £3.34 £3.21 View £3.10 £2.78 £2.70 £2.61	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 350V 120mA LCA182STR IXYS Integrated Circuits 1: £3.90 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 £3.90 £3.66 £3.25 £3.08 View Reel £2.61 £2.93 £2.80 £2.71 £2.61 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount SPST-NO 6PIN DIP LCA710 IXYS Integrated Circuits 1: £7.50 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 02/11/2026 4,900 Expected 10/02/2027 Factory Lead Time: 35 Weeks	£7.50 £7.05 £6.32 £6.08 View £5.88 £5.61	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount 1-Form 30V 2000 mA Solid State Relay LCA717 IXYS Integrated Circuits 1: £7.50 201In Stock 300Expected 02/11/2026	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 02/11/2026	£7.50 £6.68 £6.38 £6.15 View £5.95 £5.46 £5.30 £5.19 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single 1-Form-A 250V 50mA relay OMA160S IXYS Integrated Circuits 1: £5.03 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	£5.03 £4.48 £4.47 £4.23 View £3.95 £3.85 £3.76 £3.63	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount DPST-NO/NO 6PIN DIP PAA193 IXYS Integrated Circuits 1: £9.04 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	£9.04 £8.47 £7.53 £7.15 View £6.77 £6.20 £5.98 £5.77	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Dual 1-Form-A 600V 100mA SSR PAA193S IXYS Integrated Circuits 1: £8.21 153In Stock 50Expected 07/01/2027	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 07/01/2027	£8.21 £7.32 £6.99 £6.75 View £6.51 £6.02 £5.92 £5.81 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 400V 150mA PLA110L IXYS Integrated Circuits 1: £6.24 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	£6.24 £5.85 £5.19 £4.94 View £4.68 £4.37 £4.22 £4.07	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount SPST-NO 6PIN DIP PLA110S IXYS Integrated Circuits 1: £6.09 45In Stock 250Expected 05/07/2027	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 05/07/2027	£6.09 £5.71 £5.08 £4.83 View £4.57 £4.26 £4.12 £3.98	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 400V 150mA PLA110STR IXYS Integrated Circuits 1: £5.54 108In Stock 3,000On 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	108In Stock 3,000On Order On Order Ship Dates Mfr. No: PLA110STR Stock: 108 Can Dispatch Immediately On Order: 1,000 Expected 27/01/2027 2,000 Expected 22/03/2027 Factory Lead Time: 36 Weeks	Cut Tape £5.54 £5.43 Reel £3.85 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount Single-Pole Relay 60V 600mA PLA132 IXYS Integrated Circuits 1: £7.05 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	£7.05 £6.29 £6.01 £5.80 View £5.76 £5.28 £5.12 £5.05 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 60V 600mA PLA132S IXYS Integrated Circuits 1: £7.05 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	£7.05 £6.29 £6.01 £5.80 View £5.60 £5.31 £4.90 £4.85 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 400V 250mA PLA140L IXYS Integrated Circuits 1: £7.14 38In Stock 100Expected 03/06/2027	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 03/06/2027	£7.14 £6.36 £6.08 £5.87 View £5.56 £5.41 £5.33 £5.26 Quote	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 800V 100mA PLA170 IXYS Integrated Circuits 1: £5.34 10In Stock 400Expected 29/07/2027	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 29/07/2027	£5.34 £4.89 £4.47 £4.23 View £4.02 £3.62	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single-Pole Relay 800V 100mA PLA170S IXYS Integrated Circuits 1: £5.35 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	£5.35 £5.01 £4.46 £4.23 View £4.02 £3.78	Min.: 1 Mult.: 1
Solid State Relays - PCB Mount Single Pole 1-Form-A, 250V,250mA PLA171PTR IXYS Integrated Circuits 1: £5.66 132In Stock 1,000Expected 28/06/2027	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 28/06/2027	Cut Tape £5.66 £5.18 £4.80 £4.64 View Reel £3.73 £4.48 £4.00 £3.86 £3.73 MouseReel Available	Min.: 1 Mult.: 1 : 1,000
Solid State Relays - PCB Mount Single-Pole Relay 400V 250mA PLA191 IXYS Integrated Circuits 1: £7.10 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	£7.10 £6.33 £6.09 £5.94 View £5.24 £5.17 £5.12	Min.: 1 Mult.: 1