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onsemi MOC3073M — Optoisolators
onsemi

onsemi MOC3073M Optoisolator – 800V Triac Output, 4170Vrms

MPNMOC3073M
End of Life

onsemi MOC3073M, a 1-channel random-phase triac optoisolator, 800 V off-state, 4170 Vrms isolation, 1 kV/µs min static dV/dt, through-hole 6-DIP package, UL recognized, active production.

$1.68Ref. price · indicative, final on quote
MOC3073M datasheet
Packaging6-DIP (0.300", 7.62mm)
StockContact for availability
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

MOC3073M Technical Specifications
ParameterValue
Output typeTriac
Mounting typeThrough Hole
Voltage - isolation4170Vrms
Voltage - off state800 V
Voltage - forward (Vf)1.18V
Current - hold540µA (Typ)
Current - DC forward (If)60 mA
Current - LED trigger (Ift)6mA
Operating temperature-40°C ~ 85°C
Approval agencyUL
PackageTube
Case6-DIP (0.300\", 7.62mm)
Number of channels1
Static dV (dt)1kV/µs
Zero crossing circuitNo

Product details

The MOC3073M is a random-phase triac optoisolator from onsemi, designed to drive high-voltage triacs or directly switch AC loads in industrial and appliance controls. Its 800 V off-state voltage gives headroom for 240 VAC or 480 VAC line applications, while the minimum static dV/dt of 1 kV/µs prevents false turn-on from line transients or inductive load switching — a common failure point in motor and solenoid drives.

Isolation barrier and UL recognition — safety for mains-referenced circuits

With 4170 Vrms isolation and UL agency approval, this part meets reinforced insulation requirements for separating low-voltage control logic from hazardous mains voltage. The 1.18 V typical forward voltage and 6 mA maximum LED trigger current allow direct drive from 3.3 V or 5 V logic outputs through a series resistor, keeping the BOM simple.

Frequently asked questions

What is the difference between MOC3073M and MOC3083M?

The MOC3083M includes a zero-crossing circuit, while the MOC3073M does not. The MOC3073M is a random-phase device, meaning it turns on immediately when triggered, regardless of the AC line voltage phase — suitable for phase-angle control or solid-state relay applications where switching at any point in the cycle is needed.

When sourcing MOC3073M, what is the closest functional second-source?

The MOC3073SVM is a surface-mount variant with the same electrical ratings — 800 V off-state, 1 kV/µs dV/dt, 4170 Vrms isolation — but in a surface-mount package. For a through-hole replacement, the MOC3020M offers a 400 V off-state rating and 30 mA LED trigger current, which is a different voltage class and trigger threshold, so verify the BOM position before substituting.