UC3845L-D08-T from UTC(Unisonic Tech), in a DIP-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; error amp output sink current is limited to 10 mA maximum.
2	VFB	input	Voltage feedback, the inverting input of the error amplifier, normally connected to the power supply output through a resistor divider; input range -0.3 to +5.5 V.
3	ISENSE	input	Current sense input where a voltage proportional to inductor current is applied so the PWM can terminate output switch conduction; input range -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; operation to 1 MHz is possible.
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 and switching at one-half the oscillator frequency.
7	VCC	power_in	Positive supply; total supply and zener current (ICC+IZ) is limited to 30 mA maximum.
8	VREF	power_out	Reference output of 5.0 V typical that provides charging current for capacitor CT through resistor RT.

Key specifications

Parameter	Value
Manufacturer	UTC(Unisonic Tech)
Package	DIP-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
Current Sense and Voltage feedback Inputs	VIN	-0.3		5.5	V		4
Total Power Supply and Zener Current				30	mA	ICC+IZ	4
Error Amp Output Sink Current	ISINK			10	mA		4
Output Current, Source or Sink	IOUT			1	A		4
Output Energy (Capacitive Load per cycle)	W			5	μJ		4
Power Dissipation DIP-8	PD			1250	mW	DIP-8	4
Junction Temperature	TJ			150	°C		4
Operation Temperature	TOPR	0		70	°C		4
Storage Temperature	TSTG	-65		150	°C		4
Junction to Ambient DIP-8	θJA		100		°C/W	DIP-8	4
Reference Output Voltage	VREF	4.9	5	5.1	V	IOUT=1.0mA,TJ=25°C	4
Line Regulation	△VOUT		2	20	mV	VCC=12V ~ 25V	4
Load Regulation	△VOUT		3	25	mV	IOUT=1.0mA ~ 20mA	4
Total Output Variation over Line, Load, Temperature	VREF	4.82		5.18	V	over Line, Load, Temperature	4
Output Short Circuit Current	ISC	-30	-85	-180	mA		4
Frequency	fOSC	47	52	57	kHz	TJ=25°C	4
Frequency	fOSC	46		60	kHz	0°C ≤ TA ≤ 70°C	4
Frequency Change with Voltage	fOSC/V		0.2	1	%	VCC=12V ~ 25V	4
Frequency Change with Temperature	fOSC/T			5	%	0°C ≤ TA ≤ 70°C	4
Voltage Feedback Input	VFB	2.42	2.5	2.58	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
Output Current Sink	ISINK	2		12	mA	VOUT=1.1V, VFB=2.7V	4
Output Current Source	ISOURCE	-1		-0.5	mA	VOUT=5.0V, VFB=2.3V	4
Input Bias Current	II(BIAS)	-2		-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	PSRR	60		70	dB	VCC=12V ~ 25V	4
Unity Gain Bandwidth	GBW	0.7		1	MHz	TJ=25°C	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
Input Bias Current (Current Sense)	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 UC3845	VTHR	7.8	8.4	9	V	UC3845	5
Minimum Operating Voltage After Turn-On UC3845	VCC(MIN)	7	7.6	8.2	V	UC3845	5
Duty Cycle MAX	DCMAX	47	48	50	%		5
Power Supply Zener Voltage	VZ	30		36	V	ICC=25mA	5
Power Supply Current UC3845	ICC	0.5		1	mA	VCC=6.5V	5
Startup Current	ISTART-UP	0.3		0.5	mA	VCC=14V, UVLO Active	5

CAD (KiCad official)

Symbol: UC3845L-D08-T
Footprint: Package_DIP:DIP-8_W7.62mm
3D model: DIP-8 (KiCad packages3D, STEP)
3D model files: uc3845l-d08-t-etched.step / uc3845l-d08-t-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc3845l-d08-t.step / uc3845l-d08-t.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 43d85764f509307f, retrieved 2026-11-08, 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

UC3845L-D08-T

Verified UC3845L-D08-T

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

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