HT3843BRZ from HTCSEMI, 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; it is offset by two diode drops (1.4 V) and divided by three before connecting to the current sense comparator.
2	Voltage Feedback	input	Inverting input of the error amplifier, normally connected to the switching power supply output through a resistor divider.
3	Current Sense	input	Receives a voltage proportional to inductor current that terminates output switch conduction; under abnormal conditions the comparator threshold is internally clamped to 1.0 V.
4	RT/CT	passive	Programs the oscillator frequency and maximum output duty cycle with resistor RT to Vref and capacitor CT to ground; operation to 500 kHz is possible.
5	GND	power_in	Combined control circuitry and power ground.
6	Output	output	Directly drives the gate of a power MOSFET; peak currents up to 1.0 A are sourced and sunk by this pin.
7	VCC	power_in	Positive supply of the control IC; the bias and driver voltage maximum rating is 30 V.
8	Vref	power_out	5.0 V reference output that provides charging current for CT through RT; it is short-circuit protected and capable of providing in excess of 20 mA.

Key specifications

Parameter	Value
Manufacturer	HTCSEMI
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
Reference output voltage	Vref	4.9	5	5.1	V	IO = 1.0mA, TJ = 25C	3
Line regulation	Regline		2	20	mV	VCC = 12V to 25V	3
Load regulation	Regload		3	25	mV	IO = 1.0mA to 20mA	3
Output short circuit current	ISC	-30	-85	-180	mA		3
Oscillator frequency	fOSC	49	52	55	kHz	TJ = 25C	3
Oscillator frequency over temperature range	fOSC	48		56	kHz	TA = Tlow to Thigh	3
Oscillator frequency (RT = 6.2k, CT = 1.0nF)	fOSC	225	250	275	kHz	TJ = 25C (RT = 6.2 k, CT = 1.0 nF)	3
Frequency change with voltage	Δ fOSC/ΔV		0.2	1	%	VCC = 12V to 25V	3
Oscillator discharge current	Idischg	7.8	8.3	8.8	mA	VOSC = 2.0V, TJ = 25C	3
Oscillator discharge current over temperature range	Idischg	7.5		8.8	mA	VOSC = 2.0V, TA = Tlow to Thigh	3
Voltage feedback input	VFB	2.42	2.5	2.58	V	VO = 2.5V	3
Error amplifier input bias current	IIB		-0.1	-2	µA	VFB = 5.0V	3
Open loop voltage gain	AVOL	65	90		dB	VO = 2.0V to 4.0V	3
Unity gain bandwidth	BW	0.7	1		MHz	TJ = 25C	3
Error amplifier power supply rejection ratio	PSRR	60	70		dB	VCC = 12V to 25V	3
Error amplifier sink current	ISink	2	12		mA	VO = 1.1 V, VFB = 2.7 V	3
Error amplifier source current	ISource	-0.5	-1		mA	VO = 5.0V, VFB = 2.3 V	3
Error amplifier output high state voltage	VOH	5	6.2		V	RL = 15 k to ground, VFB = 2.3V	3
Error amplifier output low state voltage	VOL		0.8	1.1	V	RL = 15 k to Vref, VFB = 2.7V	3
Current sense input voltage gain	AV	2.85	3	3.15	V/V	Notes 5 and 6	4
Maximum current sense input threshold	Vth	0.9	1	1.1	V	Note 5	4
Current sense input bias current	IIB		-2	-10	µA		4
Propagation delay (current sense input to output)	tPLH(In/Out)		150	300	ns		4
Output low state voltage (20 mA sink)	VOL		0.1	0.4	V	ISink = 20 mA	4
Output low state voltage (200 mA sink)	VOL		1.6	2.2	V	ISink = 200 mA	4
Output high state voltage (20 mA source)	VOH	13	13.5		V	ISource = 20 mA	4
Output high state voltage (200 mA source)	VOH	12	13.4		V	ISource = 200 mA	4
Output voltage with UVLO activated	VOL(UVLO)		0.1	1.1	V	VCC = 6.0V, ISink = 1.0 mA	4
Output voltage rise time	tr		50	150	ns	CL = 1.0 nF, TJ = 25C	4
Output voltage fall time	tf		50	150	ns	CL = 1.0 nF, TJ = 25C	4
Startup threshold (VCC), HTX843B	Vth	7.8	8.4	9	V		4
Minimum operating voltage after turn-on (VCC), HTX843B	VCC(min)	7	7.6	8.2	V		4
Maximum duty cycle	DC(max)	94		96	%		4
Minimum duty cycle	DC(min)			0	%		4
Startup supply current	ICC + IC		0.3	0.5	mA	Startup, VCC = 6.5V for HTX843B, Note 7	4
Operating supply current	ICC + IC		12	17	mA		4
Power supply zener voltage	VZ	30	36		V	ICC = 25mA	4
Bias and driver voltages	VCC, VC			30	V	Zero series impedance	2
Total power supply and zener current	ICC + IZ			30	mA		2
Output current, source or sink	IO			1	A		2
Output energy (capacitive load per cycle)	W			5	µJ		2
Current sense, voltage feedback, Vref and RT/CT inputs	Vin	-0.3		5.5	V		2
Compensation	Vcomp	-0.3		7.2	V		2
Output voltage	Vo	-0.3			V		2
Error amplifier output sink current	IO			10	mA		2
Maximum power dissipation, SOIC-8 (Case 751)	PD			702	mW	TA = 25C	2
Operating junction temperature	TJ			150	°C		2
Operating ambient temperature	TA	0		70	°C	HT3842B, HT3843B	2
Storage temperature range	Tstg	-65		150	°C		2
Thermal resistance, junction-to-air, SOIC-8 (Case 751)	RSJA		178		°C/W		2

CAD (KiCad official)

Symbol: HT3843BRZ
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)
3D model files: ht3843brz-etched.step / ht3843brz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ht3843brz.step / ht3843brz.glb are the bare package body.

Provenance

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

Datasheet: HTCSEMI datasheet (16 pp, sha256 44cced5d2cd7d9f2, retrieved 2026-11-05, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-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).

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HT3843BRZ

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