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Texas Instruments UA78M33CDCYR — Discrete Semiconductors
Texas Instruments

UA78M33CDCYR 3.3V 500mA Fixed LDO, SOT-223-4

MPNUA78M33CDCYR
End of Life

Texas Instruments UA78M33CDCYR, fixed-output positive LDO regulator, 3.3 V, 500 mA, dropout 2 V max at 350 mA, PSRR 80 dB at 120 Hz, SOT-223-4, 0°C to 125°C.

$0.62Ref. price · indicative, final on quote
UA78M33CDCYR datasheet
PackagingTO-261-4, TO-261AA
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

UA78M33CDCYR Technical Specifications
ParameterValue
Output typeFixed
Mounting typeSurface Mount
Voltage - input25V
Voltage dropout2V @ 350mA
Voltage - output (Min (Fixed))3.3V
Current - output500mA
Operating temperature0°C ~ 125°C
PSRR80dB (120Hz)
PackageTape & Reel (TR); Cut Tape (CT)
CaseTO-261-4, TO-261AA
Protection featuresOver Current, Over Temperature, Short Circuit
Number of regulators1
Output configurationPositive

Product details

Fixed 3.3 V rail for up to 500 mA loads

The UA78M33CDCYR is a single-output positive LDO regulator from Texas Instruments that delivers a fixed 3.3 V at up to 500 mA. It is built for surface-mount assembly in the SOT-223-4 package (TO-261-4 compatible), with an operating temperature range from 0°C to 125°C. That temperature grade covers most commercial and industrial indoor gear — think PLC analog front-ends, sensor transmitter boards, or the 3.3 V digital rail inside a motor drive control card.

Package and mounting

Maximum dropout is 2 V at 350 mA load. The 80 dB PSRR at 120 Hz is the ripple-rejection figure that matters when this LDO is cleaning up a rectified line-frequency supply for an analog section.

Protection set and sourcing posture

Built-in over-current, over-temperature, and short-circuit protection mean this regulator can survive a momentary output short without latching off or failing. No external protection diode needed for most loads. The part carries an active lifecycle status and is ROHS3 compliant. There is no LTB notice — this is a current-production line you can commit to a BOM without obsolescence risk.

Frequently asked questions

Is UA78M33CDCYR obsolete or active?

The UA78M33CDCYR is listed as active with no last-time-buy notice. It is a current-production part you can specify into a new BOM without obsolescence concern.

What package is UA78M33CDCYR?

Surface-mount SOT-223-4 (also specified as TO-261-4, TO-261AA).

What is UA78M33CDCYR's PSRR?

80 dB at 120 Hz.