UC2842BD1R2G 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; typically connected via compensation network back to pin 2 (Voltage Feedback) to set loop response. Also serves as the input to the PWM comparator internally. Voltage range 0 to 7.2 V max.
2	Voltage Feedback	input	Inverting input of the error amplifier. Normally connected through a resistor divider to the converter output for regulation; nominal reference at this pin is 2.5 V. Input voltage range -0.3 to +5.5 V.
3	Current Sense	input	Non-inverting input of the current sense comparator; senses the primary switch current via a shunt resistor. Cycle-by-cycle current limiting threshold is nominally 1.0 V. Input voltage range -0.3 to +5.5 V.
4	RT/CT	passive	Oscillator timing pin. Connect a timing resistor (RT) from Vref to this pin and a timing capacitor (CT) from this pin to GND to set the oscillator frequency (guaranteed to 250 kHz, operable to 500 kHz).
5	GND	power_in	Signal and power ground reference for the device. In the SOIC-8 package this is the single common ground (SOIC-14 splits it into separate signal GND and Power Ground).
6	Output	output	High-current totem-pole PWM gate-drive output for a power MOSFET. Peak output current 1.0 A source or sink; typical rise/fall time 50 ns into 1.0 nF. Output swings between GND and VCC.
7	VCC	power_in	Positive supply input for control logic and the output stage. UCX842B startup UVLO threshold is 16 V (typ) with 10 V (typ) minimum operating voltage after turn-on. Absolute maximum 30 V; internal zener clamps at ~36 V.
8	Vref	power_out	Buffered 5.0 V reference output (trimmed, 5.0 V ±1% at 1 mA), used to bias the oscillator timing network and can supply modest external loads. Short-circuit current limited (-30 to -180 mA).

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

UC2842BD1R2G
UC2842BD1R2GD1G
UC2842BD1R2GN
UC2842BD1R2GNG
UC2842BD1R2GD
UC2842BD1R2GDG
UC2842BD1R2GDR2G

CAD (KiCad official)

Symbol: UC2842BD1R2G
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
`uc2842bd1r2g.step`	122 KB	You want the bare part, or you mark your own boards.
`uc2842bd1r2g-etched.step`	2.8 MB	You want the part with `UC2842BD1R2G` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 662 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 (22 pp, sha256 581ae31fbd1f3e07, 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