ADR421ARZ from Analog Devices, 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	TP	passive	Test pin reserved for factory testing; users should not connect anything to it or the device may not function properly.
2	VIN	power_in	Input voltage; ADR421 operating range is 4.5 V to 18 V, with 18 V absolute maximum supply voltage.
3	NIC	unconnected	No internal connection.
4	GND	power_in	Ground pin, 0 V.
5	TRIM	passive	Trim terminal that adjusts the output voltage over a ±0.5% range without affecting the temperature coefficient.
6	VOUT	power_out	Output voltage (2.50 V for ADR421), guaranteed to deliver load currents up to 10 mA.
7	NIC	unconnected	No internal connection.
8	TP	passive	Test pin reserved for factory testing; users should not connect anything to it or the device may not function properly.

Key specifications

Parameter	Value
Manufacturer	Analog Devices
Package	SOIC-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
Output Voltage A Grade	VOUT	2.497	2.5	2.503	V	VIN = 5.0 V to 15.0 V, TA = 25°C	5
Initial Accuracy A Grade	VOUTERR	-3		3	mV	VIN = 5.0 V to 15.0 V, TA = 25°C	5
Initial Accuracy A Grade	VOUTERR	-0.12		0.12	%	VIN = 5.0 V to 15.0 V, TA = 25°C	5
Temperature Coefficient A Grade	TCVOUT		2	10	ppm/°C	-40°C < TA < +125°C	5
Supply Voltage Headroom	VIN − VOUT	2			V		5
Line Regulation	ΔVOUT/ΔVIN		10	35	ppm/V	VIN = 5 V to 18 V, -40°C < TA < +125°C	5
Load Regulation	ΔVOUT/ΔIL			70	ppm/mA	IL = 0 mA to 10 mA, -40°C < TA < +125°C	5
Quiescent Current	IIN		390	500	µA	No load	5
Quiescent Current	IIN			600	µA	-40°C < TA < +125°C	5
Voltage Noise	eN p-p		1.75		µV p-p	0.1 Hz to 10 Hz	5
Voltage Noise Density	eN		80		nV/√Hz	1 kHz	5
Turn-On Settling Time	tR		10		µs		5
Long-Term Stability	ΔVOUT		50		ppm	1000 hours	5
Output Voltage Hysteresis	VOUT_HYS		40		ppm		5
Ripple Rejection Ratio	RRR		-75		dB	fIN = 1 kHz	5
Short Circuit to GND	ISC		27		mA		5
Supply Voltage (operating)	VIN	4.5		18	V	Features list: ADR421 operating range	1
Supply Voltage				18	V		8
Storage Temperature Range		-65		150	°C		8
Operating Temperature Range		-40		125	°C		8
Junction Temperature Range		-65		150	°C		8
Lead Temperature (Soldering, 60 sec)				300	°C	Soldering, 60 sec	8
Thermal Resistance Junction-to-Ambient, 8-Lead SOIC (R)	θJA		130		°C/W	8-Lead SOIC (R)	8
Thermal Resistance Junction-to-Case, 8-Lead SOIC (R)	θJC		43		°C/W	8-Lead SOIC (R)	8

CAD (KiCad official)

Symbol: ADR421ARZ
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)
3D model files: adr421arz-etched.step / adr421arz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); adr421arz.step / adr421arz.glb are the bare package body.

Provenance

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

Datasheet: Analog Devices datasheet (24 pp, sha256 a3f954c509a578f6, retrieved 2026-10-30, 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

ADR421ARZ

Verified ADR421ARZ

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

README