UC2844G-S08-R from UTC(Unisonic Tech), in a SOP-8. 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	Compensation	output	Error amplifier output, made available for loop compensation.
2	VFB	input	Voltage feedback, the inverting input of the error amplifier, normally connected to the supply output through a resistor divider (max input -0.3 to +5.5 V).
3	ISENSE	input	Current sense input receiving a voltage proportional to inductor current, used by the PWM to terminate output switch conduction (max input -0.3 to +5.5 V).
4	RT/CT	passive	Oscillator frequency and maximum output duty cycle are programmed by connecting resistor RT to Vref and capacitor CT to ground.
5	GND	power_in	Power ground.
6	Output	output	Directly drives the gate of a power MOSFET, sourcing and sinking peak currents up to 1 A, switching at one-half the oscillator frequency.
7	VCC	power_in	Positive supply (UC2844 UVLO thresholds 16 V on and 10 V off).
8	VREF	power_out	5.0 V reference output that provides charging current for capacitor CT through resistor RT.

Key specifications

Parameter	Value
Manufacturer	UTC(Unisonic Tech)
Package	SOP-8
Category	Power Management ICs
Pins	8

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Total Power Supply and Zener Current	ICC+Iz			30	mA		4
Output Current, Source or Sink	IOUT			1	A	Note 2	4
Output Energy (Capacitive Load per cycle)	W			5	μJ		4
Current Sense and Voltage feedback Inputs	VIN	-0.3		5.5	V		4
Error Amp Output Sink Current	ISINK			10	mA		4
Power Dissipation	PD			862	mW		4
Junction Temperature	TJ			150	°C		4
Operating Junction Temperature	TJ(OPR)	-40		120	°C		4
Storage Temperature Range	TSTG	-65		150	°C		4
Reference Output Voltage	VREF	4.95	5	5.05	V	IOUT=1.0mA,TJ=25 C	4
Line Regulation	ΔVOUT		2	20	mV	VCC=12V ~ 25V	4
Load Regulation	ΔVOUT		3	25	mV	IOUT=1.0mA ~ 20mA	4
Total Output Variation over Line, Load, Temperature	VREF	4.9		5.1	V		4
Output Short Circuit Current	ISC	-180	-85	-30	mA		4
Discharge Current	IDSG		10.8		mA	VOSC=2.0V, TJ=25°C	4
Oscillator Frequency	fOSC	47	52	57	kHz	TJ=25°C	4
Oscillator Frequency over temperature range	fOSC	46		60	kHz	TLOW ≤ TA ≤ THI	4
Frequency Change with Voltage	ΔfOSC/ΔV		0.2	1	%	VCC=12V ~ 25V	4
Frequency Change with Temperature	ΔfOSC/ΔT			5	%	TLOW ≤ TA ≤ THI	4
Voltage Feedback Input	VFB	2.45	2.5	2.55	V	VOUT=2.5V	4
Output Voltage Swing High	VOH	5		6.2	V	RL=15k to ground, VFB=2.3V	4
Output Voltage Swing Low	VOL	0.8		1.1	V	RL=15k to VREF, VFB=2.7V	4
Error Amp Sink Output Current	ISINK	2		12	mA	VOUT=1.1V, VFB=2.7V	4
Error Amp Source Output Current	ISOURCE	-1		-0.5	mA	VOUT=5.0V, VFB=2.3V	4
Input Bias Current	II(BIAS)	-1		-0.1	μA	VFB=2.7V	4
Open Loop Voltage Gain	GVO	65		90	dB	VOUT=2.0V ~ 4.0V	4
Power Supply Rejection Ratio (error amp)	PSRR	60		70	dB	VCC=12V ~ 25V	4
Unity Gain Bandwidth	GBW	0.7		1	MHz	TJ=25°C	4
Thermal Resistance (Junction-to-Air)	θJA		145		°C/W		4
Current Sense Input Voltage Gain	GV	2.85	3	3.15	V/V	Note 2 & 3	5
Maximum Current Sense Input Threshold	VI(THR)	0.9	1	1.1	V	Note 2	5
Current Sense Input Bias Current	II(BIAS)	-10		-2	μA		5
Propagation Delay	tPLH(IN/OUT)	150		300	ns		5
Output Voltage Low	VOL	0.1		0.4	V	ISINK=20mA	5
Output Voltage Low	VOL	1.6		2.2	V	ISINK=200mA	5
Output Voltage High	VOH	13		13.5	V	ISINK=20mA	5
Output Voltage High	VOH	12		13.4	V	ISINK=200mA	5
Output Voltage with UVLO Activated	VOL(UVLO)	0.1		1.1	V	VCC=6.0V, ISINK=1.0mA	5
Output Voltage Rise Time	tR	50		150	ns	CL=1.0nF,TJ=25°C	5
Output Voltage Fall Time	tF	50		150	ns	CL=1.0nF,TJ=25°C	5
Startup Threshold (UC2844)	VTHR	15	16	17	V	UC2844	5
Minimum Operating Voltage After Turn-On (UC2844)	VCC(MIN)	9	10	11	V	UC2844	5
Max Duty Cycle	DCMAX	47	48	50	%		5
Power Supply Zener Voltage	VZ	30	36		V	ICC=25mA	5
Power Supply Current (UC2844)	ICC	12		17	mA	VCC=14V	5

CAD (KiCad official)

Symbol: UC2844G-S08-R
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)
3D model files: uc2844g-s08-r-etched.step / uc2844g-s08-r-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc2844g-s08-r.step / uc2844g-s08-r.glb are the bare package body.

Provenance

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

Datasheet: UTC(Unisonic Tech) datasheet (7 pp, sha256 ad43141a5676bb47, retrieved 2026-11-06, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

UC2844G-S08-R

Verified UC2844G-S08-R

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

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