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onsemi FOD4118V — Optoisolators

FOD4118V onsemi Optoisolator Triac Output 5000Vrms 6-DIP

MPNFOD4118V
End of Life

onsemi FOD4118V, optoisolator with triac output, 1-channel, 5000Vrms isolation, 800 V off-state, zero-crossing circuit, 6-DIP through-hole package, Bulk.

$4.2Ref. price · indicative, final on quote
onsemi FOD4118V datasheet (PDF)
Packaging6-DIP (0.300", 7.62mm)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

FOD4118V specifications
ParameterValue
Output typeTriac
MountingThrough Hole
Voltage - isolation5000Vrms
Voltage - off state800 V
Voltage - forward (Vf)1.25V
Current - hold500µA
Current - DC forward (If)30 mA
Current - LED trigger (Ift)1.3mA
Operating temperature-55°C ~ 100°C
Approval agencyCSA, UL, VDE
PackageBulk
Turn on time60µs
Case6-DIP (0.300\", 7.62mm)
Channels1
Static dV (dt)10kV/µs
Zero crossing circuitYes

Product details

Triac output optoisolator for AC load switching

The FOD4118V is a 1-channel optoisolator from onsemi with a triac output, designed to drive AC loads such as solenoids, motors, and lamps from a low-voltage logic signal. Its 5000Vrms isolation rating and 800 V off-state voltage make it suitable for 240 VAC line switching with margin for transients. The built-in zero-crossing circuit triggers the triac only when the AC voltage crosses zero, minimising inrush current and conducted EMI.

Parametric deep-dive: dV/dt immunity and trigger current

Static dV/dt is rated at a minimum of 10kV/µs — this means the output triac will not falsely trigger on fast voltage transients from inductive load switching or mains-borne spikes. In a motor-drive application, that immunity saves the nuisance tripping that a lower-rated optoisolator would cause. Hold current (Ih) is 500 µA — the triac stays latched once triggered as long as the load current exceeds this value.

Frequently asked questions

What is the difference between FOD4118V and the FOD4208V?

The FOD4208V is a non-zero-crossing triac driver, while the FOD4118V includes a zero-crossing circuit. Both offer 5000Vrms isolation, 10kV/µs dV/dt, and 60 µs turn-on time. Choose the FOD4208V if you need phase-angle control (e.g., dimming); choose the FOD4118V for on/off switching where zero-crossing turn-on reduces EMI.

Can FOD4118V be used for AC load switching?

Yes — the triac output with 800 V off-state voltage and zero-crossing circuit is designed for switching AC loads up to 240 VAC. The 5000Vrms isolation provides galvanic separation between the logic-side and mains-side circuits.