AP3844CMTR-E1 from Diodes Incorporated, in a SOIC-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	COMP	output	Error amplifier output, made available for loop compensation, with a rated error amplifier output sink current of 10 mA maximum.
2	VFB	input	Inverting input of the error amplifier, normally connected to the switching power supply output through a resistor divider, with an input voltage of 2.45 V to 2.55 V at pin 1 = 2.5 V.
3	ISENSE	input	Input carrying a voltage proportional to inductor current that the PWM uses to terminate output switch conduction, with a maximum input signal of 0.9 V to 1.1 V (1 V typical).
4	RT/CT	passive	Oscillator timing pin where resistor RT connects to VREF and capacitor CT connects to ground to program the oscillator frequency and maximum duty cycle, with operation to 500 kHz possible.
5	GND	power_in	Combined control circuitry and power ground, which is the reference for all voltages on the device.
6	OUTPUT	output	Directly drives the gate of a power MOSFET, sourcing and sinking peak currents up to 1.0 A.
7	VCC	power_in	Positive supply of the control IC, with an absolute maximum supply voltage of 30 V.
8	VREF	power_out	Reference output that provides 5.00 V typical (4.90 V to 5.10 V at TA = 25 °C, IREF = 1 mA) and supplies charging current for CT through RT.

Key specifications

Parameter	Value
Manufacturer	Diodes Incorporated
Package	SOIC-8
Category	Power Management
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
Supply Voltage	VCC			30	V		5
Output Current	IO	-1		1	A		5
Analog Inputs	V(ANA)	-0.3		6.3	V		5
Error Amp Output Sink Current	ISINK(E.A)			10	mA		5
Power Dissipation (SOIC-8)	PD			460	mW	TA<25 oC, Note 3	5
Junction Operating Temperature	TJ	-40		150	oC		5
Storage Temperature Range	TSTG	-65		150	oC		5
Lead Temperature (Soldering, 10 sec)	TLEAD			300	oC	Soldering, 10 sec	5
ESD (Machine Model)				250	V	Machine Model	5
Oscillation Frequency	f			500	KHz		5
Ambient Temperature	TA	-40		85	oC		5
Thermal Resistance (Junction to Ambient, SOIC-8)	θJA		160		oC/W	SOIC-8	5
Reference Output Voltage	VREF	4.9	5	5.1	V	TA=25oC, IREF=1mA	6
Total Output Variation		4.82		5.18	V	Line, Load, Temp.	6
Line Regulation	ΔVREF	4		15	mV	12V ≤ VCC ≤25V	6
Load Regulation	ΔVREF	4		15	mV	1mA ≤ IREF ≤20mA	6
Short Circuit Output Current	ISC	-100		-180	mA	TA=25oC	6
Reference Temperature Stability			0.3		mV/oC	Note 6	6
Oscillation Frequency	f	47	52	57	KHz	TA=25oC	6
Oscillator Amplitude	VOSC		1.7		V	Pin 4, peak to peak, Note 6	6
Oscillator Temperature Stability			2.5		%	Note 6	6
Oscillator Voltage Stability		0.2		1	%	12V ≤ VCC ≤ 25V	6
Discharge Current		8.5	9.5	10.5	mA	Vpin 4 = 2V, Note 7	6
Error Amplifier Input Voltage	VI	2.45	2.5	2.55	V	Vpin 1 = 2.5V	6
Error Amplifier Output Sink Current	ISINK	5		8	mA	Vpin1 = 1.1V	6
Error Amplifier Output Source Current	ISOURCE	-0.5		-0.8	mA	Vpin1 = 5V	6
Error Amplifier High Output Voltage	VOH	5		7	V	RL = 15kΩ to GND	6
Error Amplifier Low Output Voltage	VOL	0.7		1.1	V	RL = 15kΩ to pin 8	6
Error Amplifier Voltage Gain		65		90	dB	2V ≤ VO ≤ 4V	6
Error Amplifier Power Supply Rejection Ratio	PSRR	60		70	dB	12V ≤ VCC ≤ 25V	6
Maximum Input Signal	VI(MAX)	0.9	1	1.1	V	Vpin1 = 5V, Note 4	6
Current Sense Gain	GV	2.85	3	3.15	V/V	Note 4, 5	6
Current Sense Power Supply Rejection Ratio	PSRR		70		dB	12V ≤ VCC ≤ 25V, Note 4, 6	6
Delay to Output		150		300	ns	Vpin3 = 0 to 2V, Note 6	6
Input Bias Current	IBIAS	-3		-10	μA		6
Low Output Voltage (20 mA sink)	VOL	0.1		0.4	V	ISINK = 20mA	6
Low Output Voltage (200 mA sink)	VOL	1.4		2.2	V	ISINK = 200mA	6
High Output Voltage (20 mA source)	VOH	13	14		V	ISOURCE = 20mA	6
High Output Voltage (200 mA source)	VOH	12	13		V	ISOURCE = 200mA	6
Rise Time	tR	50		150	ns	TA=25oC, CL=1nF, Note 6	6
Fall Time	tF	50		150	ns	TA=25oC, CL=1nF, Note 6	6
Start Threshold (AP3844C)	VTH(ST)	15	16	17	V	AP3842C/AP3844C	7
Min. Operation Voltage After Turn On (AP3844C)	VOPR(Min.)	8.5	10	11.5	V	AP3842C/AP3844C	7
Max. Duty Cycle (AP3844C)	D(Max.)	46	48	50	%	AP3844C/AP3845C	7
Min. Duty Cycle	D(Min.)	0			%		7
Start-up Current (AP3844C)	IST	50	80		μA	AP3842C/AP3844C, VCC = 14V	7
Operating Supply Current	ICC(OPR)	8	12		mA	Vpin3 = Vpin2 = 0V	7
Zener Voltage	VZ	30	34		V	ICC = 25mA	7
Shutdown Temperature	TSHUT		155		oC	Note 6	7
Temperature Hysteresis	THYS		25		oC	Note 6	7

CAD (KiCad official)

Symbol: AP3844CMTR-E1
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)
3D model files: ap3844cmtr-e1-etched.step / ap3844cmtr-e1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ap3844cmtr-e1.step / ap3844cmtr-e1.glb are the bare package body.

Provenance

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

Datasheet: Diodes Incorporated datasheet (14 pp, sha256 489e939c4048332f, 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).

Datasheet PDF

AP3844CMTR-E1

Verified AP3844CMTR-E1

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

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