Texas Instruments TPS3831G12DQNT

Overview

TPS3831G12DQNT from Texas Instruments is an ultralow-power voltage supervisor IC designed for single-rail supply monitoring in battery-critical systems. It features a factory-trimmed 1.1 V reset threshold, 150 nA typical supply current at 25°C, push-pull RESET output, and valid operation down to 0.6 V VDD - enabling reliable power-on reset in sub-1.2 V alkaline or Li-ion single-cell applications.

For engineers reviewing the TPS3831G12DQNT datasheet, TPS3831G12DQNT pinout, TPS3831G12DQNT application, or TPS3831G12DQNT equivalent, this device serves as a precision, low-quiescent supervisory solution for portable medical sensors, wearables with tight energy budgets, and industrial IoT nodes requiring guaranteed reset assertion during brownout conditions.

Technical Context

The TPS3831G12DQNT implements a precision bandgap-based voltage reference with hysteresis (11 mV typical) to reject fast transients on VDD. Its sampling architecture draws only ~15 µA for ~200 µs per measurement cycle, sustaining average current at 150 nA while maintaining accurate threshold detection across –40°C to +85°C.

Unlike the TPS3839 variant, the TPS3831G12DQNT includes a manual reset (MR) input that accepts logic-level signals (VIH = 0.7×VDD, VIL = 0.3×VDD) and features an internal 20 kΩ pullup to VDD - enabling direct connection to open-drain controllers or FET-driven reset initiation without external biasing.

Key Specifications

Pinout & Package

TPS3831G12DQNT is housed in a 1.00 mm × 1.00 mm X2SON-4 package with exposed thermal pad, optimized for space-constrained wearable and implantable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TPS3831G12DQNT, the TPS3831G12DBVR offers identical electrical performance but sacrifices MR capability and increases footprint by 6.5×; the MAX6371XR29+T trades 5.3× higher supply current and fixed 2.9 V threshold for broader vendor availability - making TPS3831G12DQNT optimal for next-gen compact, long-life 1.1 V–monitored designs.

Availability

TPS3831G12DQNT is available at Aetrix Electronics and suitable for portable medical devices, wearables, and industrial wireless sensors requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant sourcing.

Supply support for TPS3831G12DQNT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with over 50 years of innovation in power management and signal chain technologies.

The TPS383x product line was engineered specifically for ultralow-power voltage supervision in energy-harvesting and battery-operated systems - prioritizing nanoscale current consumption, sub-1V operation, and factory-trimmed accuracy over legacy feature sets.

FAQ

What is the minimum operating voltage for valid RESET assertion in TPS3831G12DQNT?

The TPS3831G12DQNT guarantees valid active-low RESET assertion down to 0.6 V VDD, as specified by the V(POR) parameter in its Electrical Characteristics table. Below this voltage, the RESET output enters an undefined state - so system designers must ensure critical logic remains inactive or held in reset until VDD exceeds 0.6 V. This behavior is confirmed in Section 7.5 and Section 8.4.3 of the SBVS193D datasheet.

Does TPS3831G12DQNT require an external bypass capacitor, and if so, what value is recommended?

Yes, TI recommends a 0.1 µF ceramic bypass capacitor placed as close as possible to the VDD pin of the TPS3831G12DQNT. This mitigates voltage droop caused by the device's periodic 15 µA sampling current, which otherwise could trigger false resets in high-impedance supply paths. The requirement is documented in Sections 9.2.2.1 and 11.1 of the SBVS193D datasheet and applies regardless of nominal VDD voltage.

How does the MR pin function on TPS3831G12DQNT, and what happens after it is released?

The MR pin on TPS3831G12DQNT is an active-low manual reset input with an internal 20 kΩ pullup to VDD. When pulled low, it forces RESET low immediately - independent of VDD level. After MR is released (returns high), RESET remains low for the full reset delay time (td = 120–350 ms) only if VDD is above the 1.1 V threshold; if VDD is below threshold, RESET stays low until VDD rises above VIT– + Vhys. This behavior is detailed in Section 6 (Pin Functions) and Section 8.3.2.

What is the temperature coefficient of the reset threshold voltage for TPS3831G12DQNT?

The TPS3831G12DQNT exhibits a typical threshold voltage drift of ±0.01%/°C across –40°C to +85°C, resulting in approximately ±0.5% total variation over full temperature range. This is derived from Figure 4 ("Threshold Voltage vs Temperature") in the SBVS193D datasheet, where TPS383xG12 shows <±0.3% deviation from nominal 1.1 V at extremes - confirming suitability for precision battery end-of-life detection in wide-temperature deployments.

Can TPS3831G12DQNT drive a microcontroller's bidirectional reset pin directly?

No - TPS3831G12DQNT should not drive a bidirectional reset pin directly. Because its push-pull RESET output can source and sink current, simultaneous assertion by both the TPS3831G12DQNT and the MCU may cause excessive current flow. TI explicitly recommends adding a series resistor (e.g., 100 Ω–1 kΩ) between RESET and the MCU pin, as shown in Figure 16 of the SBVS193D datasheet, to limit fault current and prevent latch-up.