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NCP1117IST33T3G

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onsemi Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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NCP1117IST33T3G

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

NCP1117IST33T3G from onsemi, in a SOT-223. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 Adjust/Ground power_in Pin 1 is the Adjust/Ground terminal; on the fixed 3.3 V device it serves as the ground reference, carrying the ground current (3.0 mA to 5.0 mA depending on output voltage per the applications section).
2 Output power_out Regulated output pin, internally connected to the heatsink tab, with output current limited to 1000 to 2200 mA (typical limit range) and the output current required not to exceed 1.0 A when Vin is greater than 12 V.
3 Input power_in Unregulated input pin; the device is rated for a maximum input voltage of 20 V and requires an input bypass capacitor of about 10 µF when the source is remote.

Key specifications

Parameter Value
Manufacturer onsemi
Package SOT-223
Category Power Management (PMIC)
Pins 3

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, 3.3 V fixed, TA = 25°C VOUT 3.267 3.3 3.333 V Vin = 5.3 V, Iout = 10 mA, TA = 25 °C 3
Output Voltage, 3.3 V fixed, over operating temperature VOUT 3.235 3.365 V Vin = 4.75 V to 10 V, Iout = 0 mA to 800 mA; TA over operating range (Note 4, NCP1117I Tlow = −40 °C, Thigh = 125 °C) 3
Line Regulation, 3.3 V Regline 0.8 4.5 mV Vin = 4.75 V to 15 V, Iout = 0 mA 3
Load Regulation, 3.3 V Regline 4.3 10 mV Iout = 0 mA to 800 mA, Vin = 4.75 V 3
Dropout Voltage at Iout = 100 mA (measured at Vout − 100 mV) Vin−Vout 0.95 1.1 V Iout = 100 mA, measured at Vout − 100 mV 3
Dropout Voltage at Iout = 500 mA (measured at Vout − 100 mV) Vin−Vout 1.01 1.15 V Iout = 500 mA, measured at Vout − 100 mV 3
Dropout Voltage at Iout = 800 mA (measured at Vout − 100 mV) Vin−Vout 1.07 1.2 V Iout = 800 mA, measured at Vout − 100 mV 3
Output Current Limit Iout 1000 1500 2200 mA Vin−Vout = 5.0 V, TA = 25°C (Note 6) 3
Quiescent Current, 3.3 V IQ 6 10 mA Vin = 15 V 4
Ripple Rejection, 3.3 V RR 60 64 dB Vin−Vout = 6.4 V, Iout = 500 mA, 10 Vpp 120 Hz sinewave 4
Thermal Regulation 0.01 0.1 %/W TA = 25°C, 30 ms pulse 4
Input Voltage Vin 20 V Note 1 2
Operating Ambient Temperature Range (NCP1117I grade) TA -40 125 °C NCP1117I 2
Maximum Die Junction Temperature Range TJ -55 150 °C 2
Storage Temperature Range Tstg -65 150 °C 2
Thermal Resistance, Junction-to-Ambient, SOT-223 (Minimum Size Pad) RJA 160 °C/W Case 318H (SOT-223), minimum size pad 2
Thermal Resistance, Junction-to-Case, SOT-223 RJC 15 °C/W Case 318H (SOT-223) 2

CAD (KiCad official)

  • Symbol: NCP1117IST33T3G
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223 (KiCad packages3D, STEP)
  • 3D model files: ncp1117ist33t3g-etched.step / ncp1117ist33t3g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ncp1117ist33t3g.step / ncp1117ist33t3g.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (19 pp, sha256 8bd6d0050aa83242, retrieved 2026-10-19, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF