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 (USD) 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 Dual 1-Form-A 250V 250mA SSR PAA150S IXYS Integrated Circuits 1: $18.90 267In Stock	Mfr. Part # PAA150S Mouser Part # 849-PAA150S	IXYS Integrated Circuits	Solid State Relays - PCB Mount Dual 1-Form-A 250V 250mA SSR Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	267In Stock	$18.90 $16.80 $15.96 $15.12 View $14.27 $13.57 $13.10	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-8	MOSFET
Solid State Relays - PCB Mount Single-Pole Relay 250V 250mA PLA150 IXYS Integrated Circuits 1: $11.31 835In Stock	Mfr. Part # PLA150 Mouser Part # 849-PLA150	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single-Pole Relay 250V 250mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	835In Stock	$11.31 $10.09 $9.63 $8.54 View $8.16 $7.79 $7.33	Min.: 1 Mult.: 1	PCB Mount	DIP-6	MOSFET
Solid State Relays - PCB Mount Single Pole 1-Form-A, 250V,250mA PLA150STR IXYS Integrated Circuits 1: $11.77 1,089In Stock	Mfr. Part # PLA150STR Mouser Part # 849-PLA150STR	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	1,089In Stock	Cut Tape $11.77 $11.10 Reel $7.84 $6.97 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	PCB Mount	SMD DIP-6	MOSFET
Solid State Relays - PCB Mount Single-Pole Relay 300V 50mA PLA160STR IXYS Integrated Circuits 1: $11.39 754In Stock	Mfr. Part # PLA160STR Mouser Part # 849-PLA160STR	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single-Pole Relay 300V 50mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	754In Stock	Cut Tape $11.39 $10.15 $9.67 $9.19 View Reel $7.51 $8.71 $8.07 $7.80 $7.51 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	PCB Mount		MOSFET
Solid State Relays - PCB Mount Single Pole 800V, 100mA SSR PLA171P IXYS Integrated Circuits 1: $9.30 971In Stock	Mfr. Part # PLA171P Mouser Part # 849-PLA171P	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single Pole 800V, 100mA SSR Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	971In Stock	$9.30 $8.53 $8.20 $7.90 View $7.63 $7.45 $7.19 $6.94 $6.11	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-8	MOSFET
Solid State Relays - PCB Mount 800V Normally-Open 6-Pin OptoMOS Relay PLA172PTR IXYS Integrated Circuits 1: $12.60 429In Stock	Mfr. Part # PLA172PTR Mouser Part # 849-PLA172PTR	IXYS Integrated Circuits	Solid State Relays - PCB Mount 800V Normally-Open 6-Pin OptoMOS Relay Learn More about IXYS Integrated Circuits ixys pla172p relays	Datasheet	429In Stock	Cut Tape $12.60 $11.23 $10.73 $10.36 View Reel $8.84 $10.01 $9.50 $9.18 $8.84 Quote MouseReel Available	Min.: 1 Mult.: 1 : 1,000	PCB Mount	SMD DIP-6	MOSFET
Solid State Relays - PCB Mount Single-Pole Relay 400V 250mA PLA191S IXYS Integrated Circuits 1: $12.36 731In Stock	Mfr. Part # PLA191S Mouser Part # 849-PLA191S	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	731In Stock	$12.36 $11.01 $10.66 $10.10 View $9.37 $8.96 Quote	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-6	MOSFET
Solid State Relays - PCB Mount Single-Pole Relay 600V 100mA PLA193STR IXYS Integrated Circuits 1: $8.46 1,719In Stock 2,000Expected 11/13/2026	Mfr. Part # PLA193STR Mouser Part # 849-PLA193STR	IXYS Integrated Circuits	Solid State Relays - PCB Mount Single-Pole Relay 600V 100mA Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	1,719In Stock 2,000Expected 11/13/2026	Cut Tape $8.46 $8.15 Reel $5.76 $5.42 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	PCB Mount	SMD DIP-6	MOSFET
Solid State Relays - PCB Mount 600V, 1A AC Solid State Relay IXYS Integrated Circuits CPC1965G CPC1965G IXYS Integrated Circuits 1: $11.01 11,365In Stock 10,775Expected 8/26/2027 End of Life	Mfr. Part # CPC1965G Mouser Part # 849-CPC1965G End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 600V, 1A AC Solid State Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	11,365In Stock 10,775Expected 8/26/2027	$11.01 $9.82 $8.84 $8.53 View $8.22 $7.61 $7.40 $7.28 Quote	Min.: 1 Mult.: 1	PCB Mount		SCR
Solid State Relays - PCB Mount 1-Form-A 60V 100mA Solid State Relay CPC1017NTR IXYS Integrated Circuits 1: $2.50 5,505In Stock 136,000On Order End of Life	Mfr. Part # CPC1017NTR Mouser Part # 849-CPC1017NTR End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A 60V 100mA Solid State Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	5,505In Stock 136,000On Order On Order Ship Dates Mfr. #: CPC1017NTR Stock: 5,505 Can Ship Immediately On Order: 68,000 Expected 12/2/2026 68,000 Expected 6/17/2027 Factory Lead-Time: 30 Weeks	Cut Tape $2.50 $2.30 $2.12 $2.05 View Reel $1.77 $1.98 $1.87 $1.82 $1.77 $1.77 MouseReel Available	Min.: 1 Mult.: 1 : 2,000	PCB Mount	SOP-4	MOSFET
Solid State Relays - PCB Mount 1-Form-A 60V 750mA Solid State Relay CPC1019N IXYS Integrated Circuits 1: $5.55 4,936In 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	4,936In Stock 4,100Expected 6/2/2027	$5.55 $5.01 $4.68 $4.47 View $4.30 $4.10 $3.97 $3.84 $3.82	Min.: 1 Mult.: 1	PCB Mount	SOP-4	MOSFET
Solid State Relays - PCB Mount 350V 120mA Single OptoMOS Relay CPC1330G IXYS Integrated Circuits 1: $5.07 439In Stock End of Life	Mfr. Part # CPC1330G Mouser Part # 849-CPC1330G End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 350V 120mA Single OptoMOS Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	439In Stock	$5.07 $4.76 $4.23 $4.03 View $3.89 $3.71 $3.59 $3.46	Min.: 1 Mult.: 1	PCB Mount	DIP-4	MOSFET
Solid State Relays - PCB Mount 350V 120mA Single OptoMOS Relay CPC1330GR IXYS Integrated Circuits 1: $5.07 1,570In Stock 500Expected 1/13/2027 End of Life	Mfr. Part # CPC1330GR Mouser Part # 849-CPC1330GR End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 350V 120mA Single OptoMOS Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	1,570In Stock 500Expected 1/13/2027	$5.07 $4.76 $4.23 $4.03 View $3.89 $3.71 $3.59 $3.46	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-4	MOSFET
Solid State Relays - PCB Mount 600V 90mA Single OptoMOS Relay CPC1393G IXYS Integrated Circuits 1: $6.18 1,005In Stock End of Life	Mfr. Part # CPC1393G Mouser Part # 849-CPC1393G End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 600V 90mA Single OptoMOS Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	1,005In Stock	$6.18 $5.51 $5.27 $5.08 View $4.88 $4.63 $4.52 $4.32 $4.13	Min.: 1 Mult.: 1	PCB Mount	DIP-4	MOSFET
Solid State Relays - PCB Mount 1-Form-A; 600V,120mA 5000Vrms Isolation CPC1394GRTR IXYS Integrated Circuits 1: $5.50 2,527In Stock 5,000On Order End of Life	Mfr. Part # CPC1394GRTR Mouser Part # 849-CPC1394GRTR End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1-Form-A; 600V,120mA 5000Vrms Isolation Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	2,527In Stock 5,000On Order On Order Ship Dates Mfr. #: CPC1394GRTR Stock: 2,527 Can Ship Immediately On Order: 2,000 Expected 11/2/2026 3,000 Expected 7/30/2027 Factory Lead-Time: 36 Weeks	Cut Tape $5.50 $5.03 $4.85 $4.65 View Reel $4.12 $4.43 $4.29 $4.12 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	PCB Mount		MOSFET
Solid State Relays - PCB Mount SP, Normally-Open OptoMOS Relay CPC1540GS IXYS Integrated Circuits 1: $8.03 448In Stock 2,950On Order End of Life	Mfr. Part # CPC1540GS Mouser Part # 849-CPC1540GS End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount SP, Normally-Open OptoMOS Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	448In Stock 2,950On Order On Order Ship Dates Mfr. #: CPC1540GS Stock: 448 Can Ship Immediately On Order: 950 Expected 12/7/2026 2,000 Expected 3/1/2027 Factory Lead-Time: 54 Weeks	$8.03 $7.53 $6.70 $6.36 View $6.02 $5.72 $5.51 $5.33	Min.: 1 Mult.: 1	PCB Mount	SMD DIP-6	MOSFET
Solid State Relays - PCB Mount DC Only Single Pole i4-PAC CPC1727J IXYS Integrated Circuits 1: $29.89 344In Stock End of Life	Mfr. Part # CPC1727J Mouser Part # 849-CPC1727J End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount DC Only Single Pole i4-PAC Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	344In Stock	$29.89 $28.60 $24.30 $21.26 Quote Quote	Min.: 1 Mult.: 1	PCB Mount	i4-PAC	MOSFET
Solid State Relays - PCB Mount 60V Single Pole 60V Power Relay CPC1909J IXYS Integrated Circuits 1: $27.31 479In Stock 325Expected 7/23/2027 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 7/23/2027	$27.31 $25.12 $23.79 $22.48 View $21.66 $20.68 $19.97	Min.: 1 Mult.: 1	PCB Mount	ISOPLUS264	MOSFET
Triac & SCR Output Optocouplers 400V, 1mA AC Solid State Relay CPC1945G IXYS Integrated Circuits 1: $12.40 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	$12.40 $9.59 $7.76 $7.12 View $6.77 Quote	Min.: 1 Mult.: 1	Through Hole	DIP-16
Solid State Relays - PCB Mount 1000V Single Pole SIP Power Relay CPC1981Y IXYS Integrated Circuits 1: $10.69 398In Stock 2,925On Order End of Life	Mfr. Part # CPC1981Y Mouser Part # 849-CPC1981Y End of Life	IXYS Integrated Circuits	Solid State Relays - PCB Mount 1000V Single Pole SIP Power Relay Learn More about IXYS Integrated Circuits littelfuse optomos 1 form a ssrs	Datasheet	398In Stock 2,925On Order On Order Ship Dates Mfr. #: CPC1981Y Stock: 398 Can Ship Immediately On Order: 1,500 Expected 2/8/2027 1,425 Expected 2/12/2027 Factory Lead-Time: 54 Weeks	$10.69 $9.78 $8.98 $8.59 View $8.23 $7.18	Min.: 1 Mult.: 1	PCB Mount	SIP-4	MOSFET
Solid State Relays - PCB Mount 120MA DPST 8-DIP LAA110 IXYS Integrated Circuits 1: $12.53 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	$12.53 $11.49 $10.53 $10.06 View $9.62 $9.05	Min.: 1 Mult.: 1	PCB Mount	DIP-8	MOSFET
Solid State Relays - PCB Mount 350V 120mA Dual Single-Pole LAA110L IXYS Integrated Circuits 1: $12.22 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	$12.22 $10.89 $10.40 $10.04 View $8.97 $8.65 $8.40 $8.28	Min.: 1 Mult.: 1	PCB Mount	DIP-8	MOSFET
Solid State Relays - PCB Mount 350V 170mA Dual Single-Pole LAA125LS IXYS Integrated Circuits 1: $13.79 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	$13.79 $12.92 $11.49 $10.91 View $10.34 $9.46 $9.14 $8.83	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: $16.33 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	$16.33 $14.51 $13.79 $13.07 View $12.43 $11.87 $11.47 $11.06	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: $15.03 442In 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	442In Stock	Cut Tape $15.03 $13.39 $12.79 $12.35 View Reel $10.58 $11.90 $11.35 $10.96 $10.58 Quote MouseReel Available	Min.: 1 Mult.: 1 : 1,000	PCB Mount	SMD DIP-8	MOSFET

OptoMOS 1-Form-A (SPST-NO) Solid State Relays

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