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NCT3933U

Nuvoton Tech · Digital To Analog Converters (DAC) · SOT-23-8

NCT3933U from Nuvoton Tech, in a SOT-23-8. 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	VCC	power_in	DC power supply voltage input, 3 V to 5.5 V; the POR threshold at VCC rising is typically 2.6 V, and all outputs are disabled below that level.
2	ADD_SEL	input	SMBus slave address select analog input; connect a resistor divider to set one of six addresses (0x2A to 0x20) per Table 1, with the ADD_SEL voltage compared to an internal reference.
3	GND	power_in	Power supply ground.
4	SDA	bidirectional	SMBus bidirectional serial data, open-drain with TTL-level and Schmitt-trigger inputs and 12 mA sink capability; requires a pull-up resistor (VPULLUP 2.7 V to 5.5 V).
5	SCL	input	SMBus serial clock input with a pull-up resistor required; SMBus input high voltage VIH is 2.1 V minimum and input low voltage VIL is 0.8 V maximum.
6	OUT3	output	Analog current output that sinks or sources the current set by the internal OUT3 DAC register (up to ±1270 µA, or ±2540 µA with the twofold setting); the feedback voltage must be between 0.5 V and VCC-1 V for proper operation.
7	OUT2	output	Analog current output that sinks or sources the current set by the internal OUT2 DAC register (up to ±1270 µA, or ±2540 µA with the twofold setting); the feedback voltage must be between 0.5 V and VCC-1 V for proper operation.
8	OUT1	output	Analog current output that sinks or sources the current set by the internal OUT1 DAC register (up to ±1270 µA, or ±2540 µA with the twofold setting); the feedback voltage must be between 0.5 V and VCC-1 V for proper operation.

Key specifications

Parameter	Value
Manufacturer	Nuvoton Tech
Package	SOT-23-8
Category	Data Acquisition
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
Power Supply Voltage		-0.3		6	V		16
Voltage on Other Pins		-0.3			V		16
Storage Temperature		-50		150	C		16
ESD Protection Human Body Mode				2	kV	Human Body Mode	16
ESD Protection Machine Mode				200	V	Machine Mode	16
Latch-up				100	mA		16
Power Dissipation	PD			0.4	W	TA=25C	16
Operating Temperature		-20		125	C		16
Junction Temperature		-20		125	C		16
Supply Voltage	VCC	3		5.5	V		16
Supply Input Voltage	VCC	3		5.5	V		16
Supply Input Current	ICC	0.5		1.5	mA	All IOUT = 0A, VCC = 5V; SCL = SDA = 0V or 5V	16
Supply Input Current in Power Saving Mode	ICC_PSM	0.3		0.6	mA	All IOUT = 0A, VCC = 5V; SCL = SDA = 0V or 5V, CR05 bit6=1	16
Input High Leakage	IIH			1	A	VIN = VCC	16
Input Low Leakage	IIL	-1			A	VIN = 0V	16
SMBus Input High Voltage	VIH	2.1			V		17
SMBus Input Low Voltage	VIL			0.8	V		17
SMBus Output Low Voltage	VOL			0.4	V	IOL = IPULLUP	17
Nominal Pullup Voltage	VPULLUP	2.7		5.5	V		17
SMBus Current Sinking	IPULLUP	12			mA	VOL = 0.4V	17
Output Leakage Current at Zero Current Setting	IZERO	-1		1	uA	VOUT(1) = 0~5V	17
Output Current Accuracy		-5		5	%	IOUT = 110uA ~ 2540uA, VOUT(1) = 0.8V	17
Output Current Accuracy		-5		5	uA	IOUT = 0uA ~ 100uA, VOUT(1) = 0.8V	17
Output Current Variation due to Output Voltage Change		-1.2		1.2	%/V	IOUT sinking, VOUT(1) = 0.5V~VCC	17
Output Current Variation due to Output Voltage Change		-1		1	%/V	IOUT sourcing, VOUT(1) = 0V~VCC-1V	17
Output Current Variation due to Power Supply Change		-1		1	%/V	IOUT sinking, VOUT(1) = 0.5V, VCC = 3V~5.5V	17
Address 1 Voltage				15	%VCC	Address = 0x2A	17
Address 2 Voltage		20	25	30	%VCC	Address = 0x28	17
Address 3 Voltage		37	42	47	%VCC	Address = 0x26	17
Address 4 Voltage		53	58	62	%VCC	Address = 0x24	17
Address 5 Voltage		70	75	80	%VCC	Address = 0x22	17
Address 6 Voltage		85			%VCC	Address = 0x20	17
SCL Clock Period	tSCL	10		100	KHz		18
Start Condition Hold Time	tHD;SDA	4			uS		18
Stop Condition Setup Time	tSU;STO	4			uS		18
DATA to SCL Setup Time	tSU;DAT	250			nS		18
DATA to SCL Hold Time	tHD;DAT	300			nS		18
SCL and SDA Rise Time	tR			1	uS		18
SCL and SDA Fall Time	tF			300	nS		18
Time to Operate after POR	tPOR			500	mS		18
POR Threshold	VCC_POR		2.6		V		16
Step Speed Accuracy			80		%		17
Watchdog Timer Delay Accuracy			80		%		17
Package Thermal Resistance, SOT23-8	θJA		250		C/W		16

CAD (KiCad official)

Symbol: NCT3933U
Footprint: Package_TO_SOT_SMD:SOT-23-8
3D model: SOT-23-8 (KiCad packages3D, STEP)
3D model files: nct3933u-etched.step / nct3933u-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); nct3933u.step / nct3933u.glb are the bare package body.

Provenance

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

Datasheet: Nuvoton Tech datasheet (26 pp, sha256 a30205302ec9a9ef, retrieved 2026-10-17, 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