Texas Instruments TPS3847108DBVT

Overview

TPS3847108DBVT from Texas Instruments is an ultralow-power voltage supervisor IC that monitors a 10.8 V supply rail and asserts an active-low reset signal when VCC drops below 10.53 V (–2.5% tolerance). It features 380 nA typical supply current, 4.5 V to 18 V operating range, ±2.5% threshold accuracy, push-pull output, and 20 ms max reset delay. It is used in battery-powered systems requiring precise brownout detection with minimal quiescent draw.

For engineers reviewing the TPS3847108DBVT datasheet, TPS3847108DBVT pinout, TPS3847108DBVT application, or TPS3847108DBVT equivalent, key selection criteria include factory-trimmed 10.8 V threshold, 380 nA supply current at 25°C, SOT-23-5 package compatibility, push-pull RESET output drive capability, and MR pin support for processor-initiated reset - all validated across –40°C to +85°C.

Technical Context

The TPS3847108DBVT implements a precision voltage monitoring function using internal trimmed resistive dividers and a low-power sampling architecture. Its negative-going threshold (VIT–) is fixed at 10.8 V ±2.5%, with hysteresis of 0.035 × VIT– (≈378 mV), ensuring noise immunity during supply recovery. The device operates without external components beyond a recommended 0.1 µF VCC bypass capacitor.

It supports dual reset initiation modes: automatic detection via VCC falling below VIT– (with 55 µs propagation delay), and manual assertion via logic-low MR input (50 µs propagation delay). RESET output is push-pull, eliminating need for external pull-up and enabling direct interface with microcontroller reset inputs rated up to 5 V.

Key Specifications

Pinout & Package

TPS3847108DBVT is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts and compatible with standard pick-and-place assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3847108DBVT, TPS3840108DBVR lacks high-voltage capability and MAX6326LT10D2T trades lower threshold error for significantly higher supply current and open-drain limitations - making TPS3847108DBVT optimal for 10–18 V battery and industrial systems demanding ultralow I_Q and push-pull simplicity.

Availability

TPS3847108DBVT is available at Aetrix Electronics and suitable for portable medical sensors, lithium-ion battery protection circuits, industrial PLC I/O modules, and automotive infotainment power sequencing requiring stable component supply and long-term lifecycle support.

Supply support for TPS3847108DBVT 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.

The TPS3847 family was designed specifically for ultralow-power, high-voltage supervision in battery-critical and energy-harvesting applications - emphasizing factory-trimmed accuracy, nanoscale quiescent current, and robust transient rejection without external components.

FAQ

What is the exact reset threshold voltage of the TPS3847108DBVT?

The TPS3847108DBVT has a factory-trimmed negative-going reset threshold (VIT–) of 10.8 V with ±2.5% accuracy over temperature, meaning the actual trip point falls between 10.53 V and 11.07 V at 25°C. This value is laser-trimmed during production and does not require external resistor configuration - the "108" in the part number explicitly denotes the 10.8 V nominal threshold.

Does the TPS3847108DBVT require an external capacitor, and if so, where and why?

Yes, the TPS3847108DBVT requires a 0.1 µF ceramic capacitor placed between the VCC pin and GND, located as close as possible to the device. This bypass capacitor stabilizes the internal reference during the 12 µA, 500 µs sampling pulse that occurs every ~200 ms; without it, high-impedance supply paths may cause false resets due to voltage droop on the VCC rail.

Can the TPS3847108DBVT be used with a 3.3 V microcontroller reset input?

Yes, the TPS3847108DBVT's push-pull RESET output is fully compatible with 3.3 V logic. Its VOH is ≥2.45 V at IOH = –2 mA when VCC = 18 V, and VOL is ≤0.4 V at IOL = 2 mA - both well within 3.3 V logic-high and logic-low voltage specifications. No level-shifting circuitry is needed.

What is the function of the NC pin on the TPS3847108DBVT, and how should it be handled on the PCB?

Pin 3 of the TPS3847108DBVT is marked NC (No Connection) and has no internal bond wire or circuit connection. It must remain unconnected on the PCB - neither routed nor soldered - to prevent mechanical stress on the die paddle, parasitic capacitance, or unintended ESD coupling. Leaving it floating or tying it to GND/VCC degrades reliability and is strictly prohibited.

How does the MR pin behave when not used in the TPS3847108DBVT design?

When the MR pin is unused in a TPS3847108DBVT design, it must be tied directly to VCC (not left floating). This ensures the internal MR current source (25 nA when driven <3 V) remains inactive and prevents undefined RESET behavior. TI explicitly states: "Tie MR directly to VCC if not used," as floating operation violates recommended operating conditions and risks spurious reset assertion.