ADUM1253AUA+ from ANALOG DEVICES INC., in a MSOP-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	VDD1	power_in	Side 1 supply voltage (1.71V to 5.5V); bypass with 1nF and 0.1µF ceramic capacitors as close as possible to the pin.
2	SDA1	bidirectional	Side 1 serial data input/output, translated to/from SDA2, with an open-drain output.
3	SCL1	input	Side 1 serial clock input, translated to SCL2.
4	GND1	power_in	Ground reference for side 1.
5	GND2	power_in	Ground reference for side 2.
6	SCL2	output	Side 2 serial clock output, translated from SCL1, with an open-drain output.
7	SDA2	bidirectional	Side 2 serial data input/output, translated to/from SDA1, with an open-drain output.
8	VDD2	power_in	Side 2 supply voltage (1.71V to 5.5V); bypass with 1nF and 0.1µF ceramic capacitors as close as possible to the pin.

Key specifications

Parameter	Value
Manufacturer	ANALOG DEVICES INC.
Package	MSOP-8
Category	Global Sourcing Parts
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 VDD1	VDD1	1.71		5.5	V	VDD1 relative to GND1	3
Supply Voltage VDD2	VDD2	1.71		5.5	V	VDD2 relative to GND2	3
Undervoltage-Lockout Threshold	VUVLO_	1.48	1.6	1.65	V	VDD_ rising	3
UVLO Hysteresis	VUVLO_HYST		30		mV	Note 5	3
Supply Current Side 1	IDD1		20	34	µA	VDD1 = VDD2 = 1.8V - 5V, SDA1/SCL1 = VDD1	3
Supply Current Side 1, 400kHz	IDD1		200	250	µA	SDA1/SCL1 = 400kHz square wave	3
Supply Current Side 1, 1MHz	IDD1		270	340	µA	SDA1/SCL1 = 1MHz square wave	3
Supply Current Side 2	IDD2		21	35	µA	VDD1 = VDD2 = 1.8V - 5V, SDA2/SCL2 = VDD2	3
Supply Current Side 2, SDA2/SCL2 low	IDD2		49	70	µA	SDA2/SCL2 = GND2	3
Supply Current Side 2, 400kHz	IDD2		84	110	µA	SDA2/SCL2 = 400kHz square wave	3
Supply Current Side 2, 1MHz	IDD2		146	180	µA	SDA2/SCL2 = 1MHz square wave	3
Input High Voltage SDA1/SCL1	VIH1	0.52	0.56	0.62	V	Relative to GND1	3
Input Low Voltage SDA1/SCL1	VIL1	0.47	0.51	0.56	V	Relative to GND1	4
Input Hysteresis Side 1	VHYS1		50		mV	VIH1 - VIL1 (Note 5)	4
Output Low Voltage SDA1	VOL1	0.59	0.64	0.69	V	Relative to GND1, I = 0.1mA - 5mA sink	4
VOL to VIH Threshold Difference SDA1	ΔVO/IT	45			mV	SDA1, VOL - VIH (Note 4)	4
Input High Voltage SDA2	VIH2		0.45	0.52	V	SDA2 to GND2, x VDD2 (column assignment ambiguous)	4
Input Low Voltage SDA2	VIL2	0.3		0.38	V	SDA2 to GND2, x VDD2 (column assignment ambiguous)	4
Input Hysteresis Side 2	VHYS2		0.07		V	VIH2 - VIL2, x VDD2	4
Output Low Voltage Side 2	VOL2			0.4	V	SDA2/SCL2 to GND2, I = 50mA sink	4
Static Output Loading Side 1	ISDA1	0.1		5	mA	Side 1	4
Static Output Loading Side 2	ISDA2/SCL2	0.1		50	mA	Side 2	4
Leakage Current, side 1 unpowered	IL	-10		10	µA	Device unpowered, SDA1/SCL1 = 5.5V, VDD1 = 0V	4
Leakage Current, side 2 unpowered	IL	-10		10	µA	Device unpowered, SDA2/SCL2 = 5.5V, VDD2 = 0V	4
Leakage Current, side 1 powered	IL	-10		10	µA	Device powered, SDA1 = SCL1 = VDD1 = 5.5V	4
Leakage Current, side 2 powered	IL	-10		10	µA	Device powered and not in precharge, SDA2 = SCL2 = VDD2 = 5.5V	4
Input Capacitance	CIN		5		pF	f = 1MHz (Note 5)	4
ESD HBM, SDA/SCL pins	ESD		17		kV	Human Body Model, SDA1/SCL1 to GND1 and SDA2/SCL2 to GND2 (printed ±17)	4
ESD IEC 61000-4-2 contact, GND2 to GND1	ESD		4		kV	8 MSOP (printed ±4)	4
Common-Mode Transient Immunity	CMTI		200		kV/µs	Note 6	5
Maximum Data Rate	DRMAX		2		MHz		5
Input Power Loss to Output High-Z	tHi-Z			0.4	ms	Opposite VDD_ falling below VUVLO_	8
Precharge Voltage	VPRECHG		0.3		V	SDA2/SCL2 open, VDD2 > 0.6V, at power-up, x VDD2	8
Precharge Thevenin Equivalent Impedance	RPRECHG		140		kΩ	SDA2/SCL2 open, VDD2 > 0.6V, at power-up	8
Hot-Swap Detection Enable Time	tHS_EN		102		ms	At power-up	8
Bus Stuck Timeout	tSTUCK		102		ms	Either SDA1 or SCL1 low	8
Abs Max VDD1 to GND1	VDD1	-0.3		6	V		2
Abs Max VDD2 to GND2	VDD2	-0.3		6	V		2
Abs Max SDA1, SCL1 to GND1		-0.3		6	V		2
Abs Max SDA2, SCL2 to GND2		-0.3		6	V		2
Short-Circuit Continuous Current SDA1, SCL1 to VDD1				20	mA		2
Short-Circuit Continuous Current SDA2, SCL2 to VDD2				100	mA		2
Continuous Power Dissipation 8 MSOP				247	mW	Derate 3.09mW/°C above +70°C	2
Operating Temperature Range		-40		125	°C		2
Junction Temperature	TJ			150	°C		2
Storage Temperature		-65		150	°C		2
Lead Temperature				300	°C	Soldering, 10s	2
Soldering Temperature				260	°C	Reflow	2
Junction-to-Ambient Thermal Resistance 8 MSOP	θJA		324		°C/W		2
Junction-to-Case Top Thermal Resistance 8 MSOP	θJC(TOP)		72		°C/W		2
Junction-to-Board Thermal Resistance 8 MSOP	θJB		153.5		°C/W		2
Maximum Working Isolation Voltage 8 MSOP	VIOWM		300		VRMS	Continuous RMS voltage	11
Maximum Withstanding Isolation Voltage 8 MSOP	VISO		2500		VRMS	fTEST = 60Hz, duration = 60s	11

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part	Material	Colour / plating	Datasheet says	Page
housing	pet		Reinforced insulation, maximum transient isolation voltage 4242VPK, maximum repetitive peak isolation voltage 630VPK.	14

CAD (KiCad official)

Symbol: ADUM1253AUA+
Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
3D model: MSOP-8 (KiCad packages3D, STEP)
3D model files: adum1253aua-etched.step / adum1253aua-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); adum1253aua.step / adum1253aua.glb are the bare package body.

Provenance

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

Datasheet: ANALOG DEVICES INC. datasheet (24 pp, sha256 5f950eaa215d82c4, retrieved 2026-10-31, 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

ADUM1253AUA+

Verified ADUM1253AUA+

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3D Model

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