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onsemi MOC3033M — Optoisolators
onsemi

onsemi MOC3033M Optoisolator, 250V Triac Output, Zero-Cross

MPNMOC3033M
End of Life

onsemi MOC3033M optoisolator, 1-channel Triac output, 4170Vrms isolation, 250 V off-state, zero-crossing circuit, 6-DIP through-hole package, UL approved.

$1.36Ref. price · indicative, final on quote
Packaging6-DIP (0.300", 7.62mm)
StockIn Stock (14)
Lead time3-5 Days wk
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

MOC3033M Technical Specifications
ParameterValue
Output typeTriac
Mounting typeThrough Hole
Voltage - isolation4170Vrms
Voltage - off state250 V
Voltage - forward (Vf)1.25V
Current - hold400µA (Typ)
Current - DC forward (If)60 mA
Current - LED trigger (Ift)5mA
Operating temperature-40°C ~ 85°C
Approval agencyUL
PackageBulk
Case6-DIP (0.300\", 7.62mm)
Number of channels1
Static dV (dt)1kV/µs
Zero crossing circuitYes

Product details

Triac output with 1 kV/µs dV/dt immunity

The onsemi MOC3033M is a 1-channel optoisolator with a Triac output, 4170Vrms isolation, and a 250 V off-state blocking voltage. The 1 kV/µs minimum static dV/dt means the output resists false triggering from line transients — critical when switching inductive loads like solenoids or small motors on a 120 VAC or 240 VAC line. The integrated zero-crossing circuit gates the Triac on only near the AC voltage zero, reducing inrush current and EMI at turn-on. This makes the MOC3033M a natural fit for resistive heater or incandescent lamp loads where soft switching extends contact life.

Sourcing and peer cross-reference

The closest peer in the family is the MOC3073M, which shares the same 1 kV/µs dV/dt, 4170Vrms isolation, and 6-DIP through-hole package, but lacks the zero-crossing circuit.

Frequently asked questions

What is the closest functional alternative to MOC3033M?

The MOC3073M is the closest peer — same 1 kV/µs dV/dt, 4170Vrms isolation, and 6-DIP package. The key difference: the MOC3073M lacks the zero-crossing circuit, so it triggers at any point in the AC cycle rather than near the voltage zero. For zero-cross switching, the MOC3033M is the correct part.