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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Types of Optocouplers / Photocouplers

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Part #

Solid State Relays - PCB Mount 1-Form-A 60V 600mA Solid State Relay

CPC1018NTR
IXYS Integrated Circuits
1: $4.92
29,082In Stock
22,000Expected 11/2/2026

Mfr. Part #
CPC1018NTR

Mouser Part #
849-CPC1018NTR

IXYS Integrated Circuits

Solid State Relays - PCB Mount 1-Form-A 60V 600mA Solid State Relay

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Datasheet

29,082In Stock

22,000Expected 11/2/2026

Cut Tape

$4.92

$4.38

$4.19

$4.04

View

Reel

$3.35

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: $3.93
8,972In Stock

Mfr. Part #
CPC1019N

Mouser Part #
849-CPC1019N

IXYS Integrated Circuits

Solid State Relays - PCB Mount 1-Form-A 60V 750mA Solid State Relay

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Datasheet

8,972In Stock

$3.93

$3.85

$3.60

$3.45

View

Min.: 1
Mult.: 1

PCB Mount

SOP-4

MOSFET

Solid State Relays - PCB Mount 1-Form-A 60V 750mA Solid State Relay

CPC1019NTR
IXYS Integrated Circuits
1: $3.91
72,806In Stock

Mfr. Part #
CPC1019NTR

Mouser Part #
849-CPC1019NTR

IXYS Integrated Circuits

Solid State Relays - PCB Mount 1-Form-A 60V 750mA Solid State Relay

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Datasheet

72,806In Stock

Cut Tape

$3.91

$3.48

$3.33

$3.21

View

Reel

$2.66

MouseReel Available

Min.: 1
Mult.: 1

: 2,000

PCB Mount

SOP-4

MOSFET

Solid State Relays - PCB Mount 1-Form-A 30V 1200V Solid State Relay

CPC1020NTR
IXYS Integrated Circuits
1: $6.06
7,744In Stock
100,000On Order

Mfr. Part #
CPC1020NTR

Mouser Part #
849-CPC1020NTR

IXYS Integrated Circuits

Solid State Relays - PCB Mount 1-Form-A 30V 1200V Solid State Relay

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Datasheet

7,744In Stock

100,000On Order

Cut Tape

$6.06

$5.40

$5.16

$4.98

View

Reel

$4.13

MouseReel Available

Min.: 1
Mult.: 1

: 2,000

PCB Mount

SOP-4

MOSFET

Solid State Relays - PCB Mount 1-Form-A 400V 120mA Solid State Relay

CPC1025N
IXYS Integrated Circuits
1: $2.87
7,469In Stock
400Expected 1/6/2027

Mfr. Part #
CPC1025N

Mouser Part #
849-CPC1025N

IXYS Integrated Circuits

Solid State Relays - PCB Mount 1-Form-A 400V 120mA Solid State Relay

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Datasheet

7,469In Stock

400Expected 1/6/2027

$2.87

$2.63

$2.46

$2.39

View

Min.: 1
Mult.: 1

PCB Mount

SOP-4

MOSFET

Solid State Relays - PCB Mount 1-Form-A 400V 120mA Solid State Relay

CPC1025NTR
IXYS Integrated Circuits
1: $3.10
120,042In Stock

Mfr. Part #
CPC1025NTR

Mouser Part #
849-CPC1025NTR

IXYS Integrated Circuits

Solid State Relays - PCB Mount 1-Form-A 400V 120mA Solid State Relay

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Datasheet

120,042In Stock

Cut Tape

$3.10

$2.76

$2.64

$2.55

Reel

$2.12

View

MouseReel Available

Min.: 1
Mult.: 1

: 2,000

PCB Mount

SOP-4

MOSFET

Solid State Relays - PCB Mount 350V 120mA Single OptoMOS Relay

CPC1330GRTR
IXYS Integrated Circuits
1: $3.64
11,831In Stock

Mfr. Part #
CPC1330GRTR

Mouser Part #
849-CPC1330GRTR

IXYS Integrated Circuits

Solid State Relays - PCB Mount 350V 120mA Single OptoMOS Relay

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Datasheet

11,831In Stock

Cut Tape

$3.64

$3.25

$3.10

$2.97

Reel

$2.55

View

MouseReel Available

Min.: 1
Mult.: 1

: 1,000

PCB Mount

SMD DIP-4

MOSFET

Solid State Relays - PCB Mount 1-Form-A 60V 600mA Solid State Relay

CPC1560GS
IXYS Integrated Circuits
1: $8.37
5,014In Stock
1,000Expected 4/12/2027

Mfr. Part #
CPC1560GS

Mouser Part #
849-CPC1560GS

IXYS Integrated Circuits

Solid State Relays - PCB Mount 1-Form-A 60V 600mA Solid State Relay

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Datasheet

5,014In Stock

1,000Expected 4/12/2027

$8.37

$7.85

$6.98

$6.62

View

Min.: 1
Mult.: 1

PCB Mount

MOSFET

Solid State Relays - PCB Mount 1-Form-A; 60V, 4ADC 2500Vrms Isolation

CPC1706Y
IXYS Integrated Circuits
1: $7.35
6,895In Stock

Mfr. Part #
CPC1706Y

Mouser Part #
849-CPC1706Y

IXYS Integrated Circuits

Solid State Relays - PCB Mount 1-Form-A; 60V, 4ADC 2500Vrms Isolation

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Datasheet

6,895In Stock

$7.35

$6.55

$6.22

$5.98

View

Min.: 1
Mult.: 1

PCB Mount

SIP-4

MOSFET

Solid State Relays - PCB Mount DC Only Single Pole i4-PAC

CPC1709J
IXYS Integrated Circuits
1: $17.80
1,556In Stock
3,100On Order

Mfr. Part #
CPC1709J

Mouser Part #
849-CPC1709J

IXYS Integrated Circuits

Solid State Relays - PCB Mount DC Only Single Pole i4-PAC

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Datasheet

1,556In Stock

3,100On Order

$17.80

$15.86

$15.15

$14.63

$14.12

Min.: 1
Mult.: 1

PCB Mount

i4-PAC

MOSFET

Solid State Relays - PCB Mount DC Only Single Pole i4-PAC

CPC1718J
IXYS Integrated Circuits
1: $18.91
1,431In Stock

Mfr. Part #
CPC1718J

Mouser Part #
849-CPC1718J

IXYS Integrated Circuits

Solid State Relays - PCB Mount DC Only Single Pole i4-PAC

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Datasheet

1,431In Stock

$18.91

$16.85

$16.08

$15.53

View

Min.: 1
Mult.: 1

PCB Mount

i4-PAC

MOSFET

Solid State Relays - PCB Mount 8Pin Single Pole NOR Mally Open SS Relay

CPC1907B
IXYS Integrated Circuits
1: $11.69
1,862In Stock
29,725On Order

Mfr. Part #
CPC1907B

Mouser Part #
849-CPC1907B

IXYS Integrated Circuits

Solid State Relays - PCB Mount 8Pin Single Pole NOR Mally Open SS Relay

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Datasheet

1,862In Stock

29,725On Order

$11.69

$10.59

$10.11

$9.76

View

Min.: 1
Mult.: 1

PCB Mount

SOIC-8

MOSFET

Solid State Relays - PCB Mount 100V Single Pole 100V Power Relay

CPC1918J
IXYS Integrated Circuits
1: $22.29
7,228In Stock
7,550Expected 1/25/2027

Mfr. Part #
CPC1918J

Mouser Part #
849-CPC1918J

IXYS Integrated Circuits

Solid State Relays - PCB Mount 100V Single Pole 100V Power Relay

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Datasheet

7,228In Stock

7,550Expected 1/25/2027

$22.29

$19.90

$18.99

$18.30

View

Min.: 1
Mult.: 1

PCB Mount

ISOPLUS264

MOSFET

Solid State Relays - PCB Mount AC SS Power Switch Dual Power SCR Out

CPC1966YX6
IXYS Integrated Circuits
1: $13.93
2,165In Stock

Mfr. Part #
CPC1966YX6

Mouser Part #
849-CPC1966YX6

IXYS Integrated Circuits

Solid State Relays - PCB Mount AC SS Power Switch Dual Power SCR Out

Learn More

Datasheet

2,165In Stock

$13.93

$12.41

$11.84

$11.40

View

Min.: 1
Mult.: 1

PCB Mount

SIP-4

SCR

Solid State Relays - PCB Mount 600V AC/DC 1-FORM-A ENHANCED ISO PSIP

CPC1984Y
IXYS Integrated Circuits
1: $17.34
3,987In Stock
1,600On Order

Mfr. Part #
CPC1984Y

Mouser Part #
849-CPC1984Y

IXYS Integrated Circuits

Solid State Relays - PCB Mount 600V AC/DC 1-FORM-A ENHANCED ISO PSIP

Learn More

Datasheet

3,987In Stock

1,600On Order

$17.34

$15.45

$14.74

$14.24

View

Min.: 1
Mult.: 1

PCB Mount

SIP-4

MOSFET

Solid State Relays - PCB Mount 1000V Single Pole 1000V Power Relay

CPC1988J
IXYS Integrated Circuits
1: $38.49
608In Stock

Mfr. Part #
CPC1988J

Mouser Part #
849-CPC1988J

IXYS Integrated Circuits

Solid State Relays - PCB Mount 1000V Single Pole 1000V Power Relay

Learn More

Datasheet

608In Stock

$38.49

$37.00

$35.74

$34.51

View

Min.: 1
Mult.: 1

PCB Mount

i4-PAC

MOSFET

Solid State Relays - PCB Mount SP AC Solid State Power Switch

CPC1998J
IXYS Integrated Circuits
1: $21.75
4,797In Stock
2,485Expected 9/9/2026

Mfr. Part #
CPC1998J

Mouser Part #
849-CPC1998J

IXYS Integrated Circuits

Solid State Relays - PCB Mount SP AC Solid State Power Switch

Learn More

Datasheet

4,797In Stock

2,485Expected 9/9/2026

$21.75

$19.75

$18.81

$17.99

View

Min.: 1
Mult.: 1

PCB Mount

i4-PAC

SCR

Solid State Relays - PCB Mount 350V 120mA Dual Single-Pole

LAA110STR
IXYS Integrated Circuits
1: $8.78
11,269In Stock

Mfr. Part #
LAA110STR

Mouser Part #
849-LAA110STR

IXYS Integrated Circuits

Solid State Relays - PCB Mount 350V 120mA Dual Single-Pole

Learn More

Datasheet

11,269In Stock

Cut Tape

$8.78

$7.82

$7.47

$7.22

View

Reel

$5.74

MouseReel Available

Min.: 1
Mult.: 1

: 1,000

PCB Mount

SMD DIP-8

MOSFET

Solid State Relays - PCB Mount 60V 1000mA Dual Single-Pole

LAA710S
IXYS Integrated Circuits
1: $19.34
5,036In Stock

Mfr. Part #
LAA710S

Mouser Part #
849-LAA710S

IXYS Integrated Circuits

Solid State Relays - PCB Mount 60V 1000mA Dual Single-Pole

Learn More

Datasheet

5,036In Stock

$19.34

$17.23

$16.46

$15.88

View

Min.: 1
Mult.: 1

PCB Mount

SMD DIP-8

MOSFET

Solid State Relays - PCB Mount Single-Pole Relay 350V 120mA

LCA110STR
IXYS Integrated Circuits
1: $4.07
13,381In Stock
4,000Expected 12/11/2026

Mfr. Part #
LCA110STR

Mouser Part #
849-LCA110STR

IXYS Integrated Circuits

Solid State Relays - PCB Mount Single-Pole Relay 350V 120mA

Learn More

Datasheet

13,381In Stock

4,000Expected 12/11/2026

Cut Tape

$4.07

$3.63

$3.47

$3.34

Reel

$2.78

View

MouseReel Available

Min.: 1
Mult.: 1

: 1,000

PCB Mount

SMD DIP-6

MOSFET

Solid State Relays - PCB Mount Single-Pole Relay 350V 120mA

LCA182STR
IXYS Integrated Circuits
1: $4.98
5,385In Stock

Mfr. Part #
LCA182STR

Mouser Part #
849-LCA182STR

IXYS Integrated Circuits

Solid State Relays - PCB Mount Single-Pole Relay 350V 120mA

Learn More

Datasheet

5,385In Stock

Cut Tape

$4.98

$4.44

$4.24

$4.10

Reel

$3.48

View

MouseReel Available

Min.: 1
Mult.: 1

: 1,000

PCB Mount

SMD DIP-6

MOSFET

Solid State Relays - PCB Mount SP-NO SS OptoMOS Relay

LCA701S
IXYS Integrated Circuits
1: $10.31
7,326In Stock

Mfr. Part #
LCA701S

Mouser Part #
849-LCA701S

IXYS Integrated Circuits

Solid State Relays - PCB Mount SP-NO SS OptoMOS Relay

Learn More

Datasheet

7,326In Stock

$10.31

$9.19

$8.77

$8.17

View

Min.: 1
Mult.: 1

PCB Mount

SMD DIP-6

MOSFET

Solid State Relays - PCB Mount SP-NO SS OptoMOS Relay

LCA701STR
IXYS Integrated Circuits
1: $9.85
2,664In Stock

Mfr. Part #
LCA701STR

Mouser Part #
849-LCA701STR

IXYS Integrated Circuits

Solid State Relays - PCB Mount SP-NO SS OptoMOS Relay

Learn More

Datasheet

2,664In Stock

Cut Tape

$9.85

$8.78

$8.38

$8.09

View

Reel

$6.93

MouseReel Available

Min.: 1
Mult.: 1

: 1,000

PCB Mount

MOSFET

Solid State Relays - PCB Mount SPST-NO 6PIN DIP

LCA710
IXYS Integrated Circuits
1: $9.87
5,483In Stock
5,150On Order

Mfr. Part #
LCA710

Mouser Part #
849-LCA710

IXYS Integrated Circuits

Solid State Relays - PCB Mount SPST-NO 6PIN DIP

Learn More

Datasheet

5,483In Stock

5,150On Order

$9.87

$9.04

$8.39

$8.11

View

Min.: 1
Mult.: 1

PCB Mount

DIP-6

MOSFET

Solid State Relays - PCB Mount SPST-NO 6 Pin SMD

LCA710S
IXYS Integrated Circuits
1: $9.67
3,381In Stock
3,500On Order

Mfr. Part #
LCA710S

Mouser Part #
849-LCA710S

IXYS Integrated Circuits

Solid State Relays - PCB Mount SPST-NO 6 Pin SMD

Learn More

Datasheet

3,381In Stock

3,500On Order

$9.67

$8.62

$8.23

$7.15

View

Min.: 1
Mult.: 1

PCB Mount

SMD DIP-6

MOSFET

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

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