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onsemi FOD2743BS — Optoisolators

FOD2743BS onsemi Optoisolator 5kV Transistor Output 8-SMD

MPNFOD2743BS
End of Life

onsemi FOD2743BS, single-channel DC-input transistor-output optoisolator, 5000Vrms isolation, 50-100% CTR at 1mA, 8-SMD Gull Wing package, -40 to 85°C operating range.

$1.98Ref. price · indicative, final on quote
Packaging8-SMD, Gull Wing
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

FOD2743BS specifications
ParameterValue
Input typeDC
Output typeTransistor
MountingSurface Mount
Voltage - isolation5000Vrms
Voltage - output70V
Voltage - forward (Vf)1.07V
Current - output (Channel)50mA
Current transfer ratio100% @ 1mA
Operating temperature-40°C ~ 85°C
PackageBulk
Case8-SMD, Gull Wing
Channels1
Vce saturation400mV

Product details

5 kV isolation for safety-barrier designs

With a current transfer ratio (CTR) guaranteed between 50% and 100% at 1 mA forward current, the part provides a predictable gain window that simplifies logic-level translation without overloading the output transistor. The output transistor is rated for 70 V collector-emitter and 50 mA continuous current, sufficient to drive a downstream logic gate or a low-power relay coil directly.

The package is — not tape-and-reel — which may affect pick-and-place handling for high-volume assembly lines. Confirm your feeder compatibility before committing.

Temperature grade and environment fit

The 8-SMD Gull Wing footprint allows visual inspection of solder joints after reflow, a practical advantage for prototype builds and low-volume production where X-ray inspection is not routine.

Frequently asked questions

Is the FOD2743BS obsolete or still active?

The FOD2743BS is active with no end-of-life notification from onsemi. It remains available for new designs and ongoing production.

What is the difference between the FOD2743BS and the FOD2743?

The FOD2743BS is the surface-mount Gull Wing variant of the FOD2743. Both share the same 5000Vrms isolation, 50-100% CTR at 1 mA, and 70 V output rating. The BS suffix indicates the 8-SMD package versus the through-hole DIP-8 of the base part.