TL431AQDBVRQ1 from Texas Instruments, in a SOT-23-5. 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	NC	unconnected	No connection.
2	NC	unconnected	Pin 2 is connected internally to ANODE (die substrate) and must be left floating or connected to ANODE.
3	CATHODE	passive	Shunt current or voltage input; the recommended cathode current for TL431xA-Q1 is 0.7 mA to 100 mA and the cathode voltage is VREF to 36 V.
4	REF	input	Threshold relative to common anode; reference input current is limited to -50 µA (low) and 10 mA (high) in absolute maximum ratings.
5	ANODE	power_in	Common pin, normally connected to ground.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOT-23-5
Category	Power Management (PMIC)
Pins	5

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	VREF	2470	2495	2520	mV	VKA = VREF, IKA = 10 mA, see Figure 20	5
Deviation of reference voltage over full temperature	VI(DEV)		14	34	mV	VKA = VREF, IKA = 10 mA, TA = -40°C to 125°C, see Figure 20	5
Ratio of change in reference voltage to change in cathode voltage	ΔVREF/ΔVKA		-1.4	-2.7	mV/V	IKA = 10 mA, ΔVKA = 10 V, VREF, see Figure 21	5
Ratio of change in reference voltage to change in cathode voltage	ΔVREF/ΔVKA		-1	-2	mV/V	IKA = 10 mA, ΔVKA = 36 V, 10 V, see Figure 21	5
Reference current	IREF		2	4	µA	IKA = 10 mA, R1 = 10 kΩ, R2 = ∞, see Figure 21	5
Deviation of reference current over full temperature	II(DEV)		0.8	2.5	µA	IKA = 10 mA, R1 = 10 kΩ, R2 = ∞, TA = -40°C to 125°C, see Figure 21	5
Minimum cathode current for regulation	IMIN		0.4	0.7	mA	VKA = VREF, see Figure 20	5
OFF-state cathode current	IOFF		0.1	0.5	µA	VKA = 36 V, VREF = 0, see Figure 22	5
Dynamic impedance	/ZKA/		0.2	0.5	Ω	IKA = 1 mA to 100 mA, VKA = VREF, f ≤ 1 kHz, see Figure 20	5
Cathode voltage	VKA			36	V	Minimum given as VREF	4
Cathode current (TL431xA-Q1)	IKA	0.7		100	mA	TL431xA-Q1	4
Operating free-air temperature	TA	-40		125	°C		4
Cathode voltage				37	V	Voltage values with respect to ANODE	4
Continuous cathode current		-100		150	mA		4
Reference input current, low		-50			µA	Low	4
Reference input current, high				10	mA	High	4
Operating junction temperature	TJ			150	°C		4
Storage temperature	Tstg	-65		150	°C		4
Junction-to-ambient thermal resistance (DBV, SOT-23 5-pin)	RθJA		215		°C/W	DBV (SOT-23), 5 pins	4
Junction-to-case (top) thermal resistance (DBV, SOT-23 5-pin)	RθJC(top)		135.2		°C/W	DBV (SOT-23), 5 pins	4
Junction-to-board thermal resistance (DBV, SOT-23 5-pin)	RθJB		43		°C/W	DBV (SOT-23), 5 pins	4
Junction-to-top characterization parameter (DBV, SOT-23 5-pin)	ψJT		19.6		°C/W	DBV (SOT-23), 5 pins	4
Junction-to-board characterization parameter (DBV, SOT-23 5-pin)	ψJB		42.1		°C/W	DBV (SOT-23), 5 pins	4

CAD (KiCad official)

Symbol: TL431AQDBVRQ1
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)
3D model files: tl431aqdbvrq1-etched.step / tl431aqdbvrq1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431aqdbvrq1.step / tl431aqdbvrq1.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (30 pp, sha256 e1937a2597007ea8, retrieved 2026-11-06, tier: manufacturer)
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).

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TL431AQDBVRQ1

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