UC3844BD1R2G
Public Made by Adomby adom
onsemi AC-DC Controllers and Regulators, SOIC-8-150mil. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
UC3844BD1R2G
onsemi · AC-DC Controllers and Regulators · SOIC-8-150mil
UC3844BD1R2G from onsemi, in a SOIC-8-150mil. 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 | Compensation | output | Error-amplifier output / loop compensation node. Available for external loop-compensation networks connected to the Voltage Feedback pin. Also drives the internal current-sense comparator through a 2 V level shift and 1/3 divider. |
| 2 | Voltage Feedback | input | Inverting input of the error amplifier. Normally connected to the switching-power-supply output through a resistor divider; internally referenced to 2.5 V. Input bias current typically -0.1 uA. |
| 3 | Current Sense | input | Current-sense comparator input. A voltage proportional to primary switch current (via a ground-referenced sense resistor) is applied here. Trips PWM latch when it reaches 1.0 V (typ) scaled from the compensation pin; input range -0.3 to +5.5 V. |
| 4 | RT/CT | passive | Oscillator timing pin. An external resistor to Vref and capacitor to GND set the oscillator frequency (fOSC ~ 1.72/(RT*CT) for RT > 5 k) and output deadtime. Guaranteed to 250 kHz; usable to 500 kHz output switching frequency. |
| 5 | GND | power_in | Device ground (control and power ground shared in the 8-pin package). Return for all internal circuitry and the totem-pole output stage. |
| 6 | Output | output | High-current totem-pole output for driving a power MOSFET gate directly. Rated for 1.0 A source/sink peak; typical rise/fall time 50 ns with 1 nF load. Duty cycle limited to 50% max (UC3844B/UC2844B). |
| 7 | VCC | power_in | Positive supply for control logic and output driver. UVLO on/off thresholds 16 V / 10 V (UC3844B). Absolute maximum 36 V; internal zener clamp at ~36 V (IZ up to 25 mA). Startup current ~0.5 mA, operating ~17 mA. |
| 8 | Vref | power_out | 5.0 V trimmed reference output (+/-1% at 25 C). Sources up to 20 mA for external circuitry and the oscillator timing resistor; short-circuit current typically -85 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOIC-8-150mil |
| Category | PMIC |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
UC3844BD1R2GUC3844BD1R2GD1GUC3844BD1R2GNUC3844BD1R2GNGUC3844BD1R2GDUC3844BD1R2GDR2GUC3844BD1R2GDG
CAD (KiCad official)
- Symbol:
UC3844BD1R2G - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8-150mil (KiCad packages3D, STEP)
- 3D model files:
uc3844bd1r2g-etched.step/uc3844bd1r2g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc3844bd1r2g.step/uc3844bd1r2g.glbare the bare package body.
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
uc3844bd1r2g.step |
122 KB | You want the bare part, or you mark your own boards. |
uc3844bd1r2g-etched.step |
2.7 MB | You want the part with UC3844BD1R2G already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 665 faces against 147 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: onsemi datasheet (19 pp, sha256
e69ff39fc0ea9e08, 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).