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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206

Name	Last commit message	Last updated
docs	az431ar-atre1: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray	1mo ago
viewers	pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray	2mo ago
az431ar-atre1-etched.fit.json	az431ar-atre1: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray	1mo ago
az431ar-atre1-etched.glb	az431ar-atre1: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray	1mo ago
az431ar-atre1-etched.step	az431ar-atre1: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray	1mo ago
az431ar-atre1.glb	Publish 0.1.0 · Ray	2mo ago
az431ar-atre1.kicad_mod	Publish 0.1.0 · Ray	2mo ago
az431ar-atre1.kicad_sym	Publish 0.1.0 · Ray	2mo ago
az431ar-atre1.lbr	rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray	2mo ago
az431ar-atre1.step	Publish 0.1.0 · Ray	2mo ago
package.json	Publish 0.2.0 · Ray	2mo ago
pads.json	pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray	2mo ago
page.json	az431ar-atre1: specified limits as data (metadata.characteristics, 23 rows from the datasheet) · Ray	20d ago
README.md	az431ar-atre1: specified limits as data (metadata.characteristics, 23 rows from the datasheet) · Ray	20d ago

AZ431AR-ATRE1

Diodes Incorporated · Voltage Reference · SOT-89-3

AZ431AR-ATRE1 from Diodes Incorporated, in a SOT-89-3. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	REF	input	Reference (feedback) input. Compared internally to the 2.5 V bandgap; when REF exceeds VREF the internal transistor sinks current from cathode to anode. Max reference input current 10 mA absolute, typ input bias 0.7 µA.
2	CATHODE	passive	Shunt cathode (K). Sinks the regulation current when REF rises above VREF. Operating cathode voltage VREF to 36 V, cathode current 1 mA to 100 mA (absolute max -100 to 150 mA), off-state leakage 0.05 µA typ.
3	ANODE	passive	Shunt anode (A), the common return for the reference and the shunt transistor. Normally tied to the low side of the regulated node (circuit ground in a standard shunt-regulator topology).

Key specifications

Parameter	Value
Manufacturer	Diodes Incorporated
Package	SOT-89-3
Category	PMIC
Pins	3

Ordering variants

AZ431AR-ATRE1
AZ431AR-ATRE1R
AZ431AR-ATRE1Z
AZ431AR-ATRE1N

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 Voltage (0.4% grade)	VREF	2.49	2.5	2.51	V	VKA = VREF, IKA = 10mA	5
Deviation of Reference Voltage Over Full Temperature Range (0 to +70°C)	VREF		4.5	8	mV	VKA = VREF, IKA = 10mA, 0 to +70°C	5
Deviation of Reference Voltage Over Full Temperature Range (-40 to +85°C)	VREF		4.5	10	mV	VKA = VREF, IKA = 10mA, -40 to +85°C	5
Deviation of Reference Voltage Over Full Temperature Range (-40 to +125°C)	VREF		4.5	16	mV	VKA = VREF, IKA = 10mA, -40 to +125°C	5
Ratio of Change in Reference Voltage to Change in Cathode Voltage (10V to VREF)	VREF/VKA		-1	-2.7	mV/V	IKA = 10mA, VKA = 10V to VREF	5
Ratio of Change in Reference Voltage to Change in Cathode Voltage (36V to 10V)	VREF/VKA		-0.5	-2	mV/V	IKA = 10mA, VKA = 36V to 10V	5
Reference Current	IREF		0.7	4	µA	IKA = 10mA, R1 = 10kΩ, R2 = ∞	5
Deviation of Reference Current Over Full Temperature Range	IREF		0.4	1.2	µA	IKA = 10mA, R1 = 10kΩ, R2 = ∞, TA = -40 to +125°C	5
Minimum Cathode Current for Regulation	IKA(Min)		0.4	1	mA	VKA = VREF	5
Off-state Cathode Current	IKA(Off)		0.05	1	µA	VKA = 36V, VREF = 0	5
Dynamic Impedance	ZKA		0.15	0.5	Ω	VKA = VREF, IKA = 1 to 100mA, f ≤ 1.0kHz	5
Cathode Voltage (absolute maximum)	VKA			40	V		4
Cathode Current Range (Continuous)	IKA	-100		150	mA		4
Reference Input Current Range	IREF			10	mA		4
Power Dissipation (Z, R package)	PD			770	mW	Z, R Package	4
ESD (Human Body Model)	ESD			2000	V	Human Body Model	4
Junction Temperature	TJ			150	°C		4
Storage Temperature Range	TSTG	-65		150	°C		4
Cathode Voltage (recommended operating)	VKA			36	V		4
Cathode Current	IKA	1		100	mA		4
Operating Ambient Temperature Range	TA	-40		125	°C		4
Thermal Resistance (Junction to Ambient), SOT89	θJA		165		°C/W	Junction to ambient, SOT89, as printed in Absolute Maximum Ratings	4
Thermal Resistance (Junction to Case), SOT89	θJC		29.8		°C/W		5

CAD (KiCad official)

Symbol: AZ431AR-ATRE1
Footprint: Package_TO_SOT_SMD:SOT-89-3
3D model: SOT-89-3 (KiCad packages3D, STEP)
3D model files: az431ar-atre1-etched.step / az431ar-atre1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); az431ar-atre1.step / az431ar-atre1.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`az431ar-atre1.step`	57 KB	You want the bare part, or you mark your own boards.
`az431ar-atre1-etched.step`	1.4 MB	You want the part with `AZ431AR-ATRE1` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 403 faces against 42 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: Diodes Incorporated datasheet (19 pp, sha256 af7f4848d81a3997, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF