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NCP1075STCT3G

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onsemi AC-DC Controllers And Regulators, SOT-223-4. Pinout reviewed by a person against the datasheet, KiCad symbol/footprint/3D.

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NCP1075STCT3G

onsemi · AC-DC Controllers And Regulators · SOT-223-4

NCP1075STCT3G from onsemi, in a SOT-223-4. 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 VCC power_in Powers the internal circuitry via an external capacitor; includes an active shunt (8.2 V clamp, 15 mA max) serving as auto-recovery over voltage protection.
2 FB input Feedback signal input; connecting an opto-coupler adjusts the peak current set point according to the output power demand.
3 DRAIN passive Internal 700 V power MOSFET drain connection, also supplies the internal start-up current source.
4 GND power_in IC ground (tab pin).

Key specifications

Parameter Value
Manufacturer onsemi
Package SOT-223-4
Category Power Management (PMIC)
Pins 4

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
VCC increasing level at which the switcher starts operation (NCP1070/71/72/75 row) VCC(on) 7.8 8.2 8.6 V 6
VCC decreasing level at which the HV current source restarts VCC(min) 6.5 6.8 7.2 V 6
VCC decreasing level at which the switcher stops operation (UVLO) VCC(off) 6.1 6.3 6.6 V 6
Offset voltage above VCC(on) at which the internal clamp activates (NCP1072/75 row) VCC(clamp) 130 190 300 mV 6
Power switch circuit on-state resistance (NCP1072/75 row) RDS(on) 11 16 Ω Id = 50 mA; TJ = 25°C 6
Power switch circuit on-state resistance (NCP1072/75 row) RDS(on) 19 24 Ω Id = 50 mA; TJ = 125°C 6
Internal IC consumption, MOSFET switching (NCP1070/71/72/75 row) ICC1 0.7 1 mA Mosfet switching 6
Maximum internal current setpoint at beginning of switching cycle (NCP1075) IIPK(0) 467 508 549 mA FB pin open, Tj = 25°C 7
Oscillation frequency, 130 kHz version fOSC 117 130 143 kHz Tj = 25°C (Note 5 et 6) 7
Frequency jittering in percentage of fOSC fjitter -6 6 % 7
Maximum duty-cycle (NCP1070/71/72/75 except NCP1072P100BG) Dmax 62 65 68 % 7
Frequency below which skip-cycle occurs Fmin 21 25 29 kHz 8
Fault validation further to error flag assertion tSCP 40 53 ms 8
VCC clamp current at which the switcher stops pulsing (NCP1072/75/76/77 row) IOVP 6 8.5 11 mA 8
Drain pin voltage above which MOSFET operation is allowed VHV(EN) 72 91 110 V Detected after TSD, UVLO, SCP or VCC OVP mode 9
Maximum internal current setpoint at 50% duty cycle (NCP1075) IIPK 450 mA FB pin open, Tj = 25°C 6
Power supply voltage on all pins, except Pin 5 (Drain) VCC -0.3 10 V 5
Drain voltage BVdss -0.3 700 V 5
Drain current peak during transformer saturation (NCP1072/75) IDS(PK) 870 mA TJ = 150°C, Note 3 5
Drain current peak during transformer saturation (NCP1072/75) IDS(PK) 1500 mA TJ = 25°C, Note 3 5
Maximum current into pin 1 when activating the 8.2 V active clamp I_VCC 15 mA 5
Maximum junction temperature TJMAX 150 °C 5
Storage temperature range -60 150 °C 5
ESD capability, Human Body Model 2 kV All pins except HV 5
ESD capability, Machine Model 200 V 5
ESD capability, Charged Device Model 1 kV 5
Junction-to-air thermal resistance, ST suffix RJ-A 74 °C/W 0.36 sq. in, 2.0 oz Cu 5
Junction-to-air thermal resistance, ST suffix RJ-A 55 °C/W 1.0 sq. in, 2.0 oz Cu 5

CAD (KiCad official)

  • Symbol: NCP1075STCT3G
  • Footprint: Package_TO_SOT_SMD:SOT-223
  • 3D model: SOT-223-4 (KiCad packages3D, STEP)
  • 3D model files: ncp1075stct3g-etched.step / ncp1075stct3g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ncp1075stct3g.step / ncp1075stct3g.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (31 pp, sha256 137f22003e8eda88, retrieved 2026-10-21, tier: lcsc)
  • 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