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UA78M33CDCYR

Public Made by Adom

by adom

Texas Instruments Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Contents

README

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UA78M33CDCYR

Texas Instruments · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223

UA78M33CDCYR from Texas Instruments, in a SOT-223. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 INPUT power_in Unregulated supply input. Recommended operating input voltage 5.3 V to 25 V (absolute maximum 35 V). Bypass to COMMON with a 0.33 µF capacitor located close to the pin.
2 COMMON power_in Device ground / common reference. Also serves as the thermal path via the SOT-223 tab (fused to pin 2).
3 OUTPUT power_out Regulated 3.3-V output, up to 500 mA. Bypass to COMMON with a 0.1 µF capacitor for stability. Dropout voltage typically 2 V.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOT-223
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • UA78M33CDCYR
  • UA78M33CDCYRKC
  • UA78M33CDCYRKCS
  • UA78M33CDCYRKTP
  • UA78M33CDCYRKVU

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Output voltage (IO = 5 mA to 350 mA, VI = 8 V to 20 V, TJ = 25°C) 3.2 3.3 3.4 V IO = 5 mA to 350 mA, VI = 8 V to 20 V 5
Output voltage (TJ = 0°C to 125°C) 3.1 3.3 3.5 V IO = 5 mA to 350 mA, VI = 8 V to 20 V, TJ = 0°C to 125°C 5
Input voltage regulation 9 100 mV VI = 5.3 V to 25 V, IO = 200 mA 5
Input voltage regulation 3 50 mV VI = 8 V to 25 V, IO = 200 mA 5
Ripple rejection (IO = 100 mA, TJ = 0°C to 125°C) 62 dB VI = 8 V to 18 V, f = 120 Hz, IO = 100 mA, TJ = 0°C to 125°C 5
Ripple rejection (IO = 300 mA) 62 80 dB VI = 8 V to 18 V, f = 120 Hz, IO = 300 mA 5
Output voltage regulation 20 100 mV VI = 8 V, IO = 5 mA to 500 mA 5
Output noise voltage 40 200 μV f = 10 Hz to 100 kHz 5
Bias current 4.5 6 mA 5
Temperature coefficient of output voltage -1 mV/°C IO = 5 mA, TJ = 0°C to 125°C 5
Bias current change (IO = 200 mA) 0.8 mA VI = 8 V to 25 V, IO = 200 mA, TJ = 0°C to 125°C 5
Bias current change (IO = 5 mA to 350 mA) 0.5 mA IO = 5 mA to 350 mA, TJ = 0°C to 125°C 5
Dropout voltage 2 V 5
Short-circuit output current 300 mA VI = 35 V 5
Peak output current 700 mA 5
Input voltage (uA78M33) VI 5.3 25 V 4
Output current IO 500 mA 4
Operating virtual junction temperature (uA78MxxC) TJ 0 125 °C 4
Input voltage VI 35 V 4
Operating virtual junction temperature TJ 150 °C 4
Storage temperature range Tstg -65 150 °C 4
Junction-to-ambient thermal resistance (DCY) RθJA 53 °C/W DCY (SOT-223) package 4
Junction-to-case (top) thermal resistance (DCY) RθJC(top) 30.6 °C/W DCY (SOT-223) package 4

CAD (KiCad official)

  • Symbol: UA78M33CDCYR
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223 (KiCad packages3D, STEP)
  • 3D model files: ua78m33cdcyr-etched.step / ua78m33cdcyr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ua78m33cdcyr.step / ua78m33cdcyr.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
ua78m33cdcyr.step 64 KB You want the bare part, or you mark your own boards.
ua78m33cdcyr-etched.step 2.3 MB You want the part with UA78M33CDCYR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 558 faces against 75 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (28 pp, sha256 2f9e83a70e81dd54, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF