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Texas Instruments UA78M33CKCSE3 — Discrete Semiconductors
Texas Instruments

UA78M33CKCSE3 3.3V 500mA Linear Regulator, TO-220-3

MPNUA78M33CKCSE3
End of Life

Texas Instruments UA78M33CKCSE3, fixed 3.3V output, 500mA positive linear regulator, TO-220-3 through-hole package, PSRR 80dB at 120Hz, operating temperature 0°C to 125°C.

$3.62Ref. price · indicative, final on quote
UA78M33CKCSE3 datasheet
PackagingTO-220-3
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.
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Specifications

UA78M33CKCSE3 Technical Specifications
ParameterValue
Output typeFixed
Mounting typeThrough Hole
Voltage - input25V
Voltage dropout2V @ 350mA
Voltage - output (Min (Fixed))3.3V
Current - output500mA
Operating temperature0°C ~ 125°C
PSRR80dB (120Hz)
PackageTube
CaseTO-220-3
Protection featuresOver Current, Over Temperature, Short Circuit
Number of regulators1
Output configurationPositive

Product details

Fixed 3.3 V rail at 500 mA — what it covers

The Texas Instruments UA78M33CKCSE3 is a fixed-output 3.3 V linear regulator rated for 500 mA continuous current. It is a single positive regulator in a TO-220-3 through-hole package, designed to supply clean DC rails for logic, MCU, sensor, or small analog circuits where ripple rejection matters.

Package and mounting — TO-220-3 through-hole

The TO-220-3 package has a metal tab for heatsink attachment. The tab is electrically connected to the output pin (pin 2), so a mica insulator or thermal pad is needed if the heatsink is grounded.

Frequently asked questions

What is the closest pin-compatible alternative to the UA78M33CKCSE3?

Within the same 78M33 family, the UA78M33CKCS (non-ROHS) and UA78M33CKVUR (surface-mount D2PAK) share the same 3.3 V fixed output and 500 mA rating but differ in package or compliance. For a direct TO-220-3 drop-in, the UA78M33CKCSE3 is the current ROHS3-compliant version.

What is the PSRR of the UA78M33CKCSE3?

The PSRR is 80 dB at 120 Hz, which attenuates 120 Hz ripple from a rectified line by a factor of 10,000 — suitable for powering noise-sensitive analog or mixed-signal circuits.