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onsemi 4N33SM — Discrete Semiconductors

4N33SM onsemi Optoisolator, 4170Vrms, Darlington Output

MPN4N33SM
End of Life

onsemi 4N33SM, single-channel optoisolator, 4170Vrms isolation, Darlington with base output, 500% min CTR at 10mA, 6-SMD gull wing package, surface mount, -40°C to 100°C

$0.85Ref. price · indicative, final on quote
Packaging6-SMD, Gull Wing
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

4N33SM specifications
ParameterValue
Input typeDC
Output typeDarlington with Base
MountingSurface Mount
Voltage - isolation4170Vrms
Voltage - output30V
Voltage - forward (Vf)1.2V
Current - output (Channel)150mA
Current transfer ratio500% @ 10mA
Current - DC forward (If)80 mA
Operating temperature-40°C ~ 100°C
PackageTube
Case6-SMD, Gull Wing
Channels1
Vce saturation1V
Turn on (Turn off time)5µs, 100µs (Max)

Product details

4170Vrms isolation and 500% CTR

Darlington with base — switching speed and drive

The Darlington output with base access gives the designer control over turn-off speed: the base pin can be pulled low to accelerate the 100 µs max turn-off time, useful in relay-coil or solenoid drive where slow fall edges cause inductive kickback.

6-SMD gull wing — board-level fit

Surface-mount 6-SMD gull-wing package, supplier device package 6-SMD. The 1.27 mm pitch gull-wing leads are compatible with standard reflow profiles and allow visual inspection of solder joints — no X-ray needed.

Frequently asked questions

Is 4N33SM RoHS compliant?

Yes, the 4N33SM is ROHS3 compliant per onsemi's product status.