component
NCP1075STCT3G
Public Made by Adomby adom
onsemi AC-DC Controllers And Regulators, SOT-223-4. Pinout reviewed by a person against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownNCP1075STCT3G
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ncp1075stct3g.step/ncp1075stct3g.glbare 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).