Ultralow-power (150 nA typical) supply voltage supervisor in a 3-pin SOT-23 package. It watches VDD against a fixed threshold and drives an active-low, push-pull RESET that can directly drive an MCU reset pin: RESET is asserted while VDD is below the threshold (plus a reset time delay) and released once the supply is good. It runs from 0.9 to 6.5 V and needs no external components. The default brown-out / power-good watchdog for battery devices where every nanoamp counts.

Pinout

Pin	Name	Type	Function
1	GND	power_in	Ground reference for the supervisor. Connect to the system ground plane.
2	RESET	output	Active-low reset output with push-pull drive; capable of directly driving input pins. RESET is asserted low whenever VDD is below the factory-trimmed threshold voltage and remains low for the reset delay (t_d = 200 ms typ) after VDD rises above the threshold plus hysteresis. Absolute maximum RESET pin current is +/-10 mA.
3	VDD	power_in	Input supply voltage, 0.9 V to 6.5 V (absolute max 7 V). Bypass to GND with a 0.1 uF ceramic capacitor placed close to the device. Supply current is 150 nA typical.

Key specifications

Parameter	Value
Type	Voltage supervisor / reset IC
Quiescent current	150 nA typ (ultralow power)
Supply (VDD)	0.9-6.5 V (abs max 7 V)
RESET output	Active-low, push-pull
Threshold	Fixed (factory-set option)
External parts	None required
Package	SOT-23-3
Body (L×W×H)	2.9 × 1.3 × 1.1 mm

Ordering variants

Same part, different packaging or reel option.

TPS3839xxxDBVR (SOT-23, tape & reel)

CAD (KiCad official)

Symbol: Power_Supervisor:TPS3839DBZ
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D)

Provenance

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

Datasheet: Texas Instruments datasheet (35 pp, sha256 5f9a9581d1b8df7f, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude) — every pin and dimension is cited to a datasheet page; refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF