UC2845BD1R2G from onsemi, in a SOIC-8. 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, made available for external loop compensation. Typical output swing is 0.8 V (low) to 6.2 V (high) with RL = 15 kOhm; sinks up to 12 mA, sources up to 1 mA.
2	Voltage Feedback	input	Inverting input of the Error Amplifier. Normally connected to the switching power supply output through a resistor divider. Internally biased at 2.5 V; input bias current typically -0.1 uA (max -2 uA).
3	Current Sense	input	Current sense input. A voltage proportional to inductor current is applied here; the PWM uses it to terminate output switch conduction cycle-by-cycle. Internal comparator threshold clamped at 1.0 V typical; current-sense-to-output propagation delay 150 ns typical.
4	RT/CT	passive	Oscillator timing pin. Program frequency and maximum output duty cycle by connecting resistor RT from Vref to this pin and capacitor CT from this pin to ground. Oscillator operation down to 1.0 kHz is possible; typical CT swing is 1.2 V to 2.8 V.
5	GND	power_in	Combined control-circuitry and power ground return for the 8-pin package.
6	Output	output	Totem-pole gate driver output for a power MOSFET. Sources and sinks peak currents up to 1.0 A; switches at one-half the oscillator frequency. VOH ~13.5 V and VOL ~0.1 V at 20 mA; rise/fall time ~50 ns typical into 1.0 nF.
7	VCC	power_in	Positive supply for the control IC. Absolute maximum 36 V (Zener clamped at ~36 V, ICC(max) 30 mA). UC2845B UVLO turn-on 8.5 V typical, turn-off 7.6 V typical; startup current ~0.3 mA, operating current ~12 mA typical.
8	Vref	power_out	5.0 V trimmed reference output (4.95 V min, 5.05 V max at IO = 1 mA, 25 degC). Supplies charging current for CT through RT. Short-circuit current typically -85 mA (limited to -180 mA max).

Key specifications

Parameter	Value
Manufacturer	onsemi
Package	SOIC-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

UC2845BD1R2G
UC2845BD1R2GD1G
UC2845BD1R2GN
UC2845BD1R2GNG
UC2845BD1R2GD
UC2845BD1R2GDG
UC2845BD1R2GDR2G

CAD (KiCad official)

Symbol: UC2845BD1R2G
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`uc2845bd1r2g.step`	122 KB	You want the bare part, or you mark your own boards.
`uc2845bd1r2g-etched.step`	2.8 MB	You want the part with `UC2845BD1R2G` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 664 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).

Datasheet PDF