Texas Instruments TPS3847085DBVT

Overview

TPS3847085DBVT from Texas Instruments is an ultralow-power voltage supervisor IC that monitors a 4.5–18 V supply rail and asserts an active-low reset signal when VCC drops below its factory-trimmed 8.5 V threshold (±2.5% accuracy). It features 380 nA typical supply current, 20 ms max reset delay, push-pull output, and manual reset (MR) input - enabling reliable power-on reset and brownout detection in battery-powered systems.

For engineers reviewing the TPS3847085DBVT datasheet, TPS3847085DBVT pinout, TPS3847085DBVT application, or TPS3847085DBVT equivalent, key selection criteria include its 8.5 V fixed threshold, –40°C to +85°C operating range, SOT-23-5 package, 5-pin push-pull output architecture, and compatibility with high-voltage lithium-ion battery monitoring and low-quiescent-power industrial control subsystems.

Technical Context

The TPS3847085DBVT implements a precision bandgap-based voltage reference with internal hysteresis (VHYS = 0.11 × VIT– ≈ 0.935 V), ensuring stable reset assertion/deassertion without external components. Its sampling-based architecture maintains ultralow 380 nA quiescent current while delivering 20 ms reset delay timing after VCC recovers above VIT+ (≈9.435 V).

It operates in two functional modes: MR high (reset controlled solely by VCC vs. VIT–/VIT+) and MR low (RESET forced low regardless of VCC). The MR input accepts 0–1.2 V for logic low and >1.2 V for logic high, with leakage <23 nA at 18 V, supporting direct connection to microcontroller GPIOs or pull-up to VCC.

Key Specifications

Pinout & Package

TPS3847085DBVT is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained portable and industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3847085DBVT, the DBVR offers identical performance in volume packaging, while TLV809K825DBZR provides lower-voltage supervision without MR or high-voltage capability - making TPS3847085DBVT uniquely suited for 8–18 V battery and industrial applications requiring manual reset and push-pull drive.

Availability

TPS3847085DBVT is available at Aetrix Electronics and suitable for portable battery monitoring, industrial power sequencing, automotive body control modules, and energy-harvesting sensor nodes requiring stable component supply with guaranteed long-term sourcing.

Supply support for TPS3847085DBVT 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 designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and consumer markets.

The TPS3847 family delivers ultralow-power voltage supervision for high-voltage battery and power-rail monitoring, targeting applications where extended battery life, precision thresholding, and robust reset timing are critical.

FAQ

What is the exact reset threshold voltage of the TPS3847085DBVT?

The TPS3847085DBVT has a factory-trimmed negative-going reset threshold voltage of 8.5 V with ±2.5% accuracy over temperature. At 25°C, the typical value is 8.5 V, and the full range spans 8.2875 V to 8.7125 V. This fixed threshold is laser-trimmed during production and does not require external resistors, ensuring consistent performance across units and eliminating calibration overhead in TPS3847085DBVT designs.

Does the TPS3847085DBVT require an external capacitor on the VCC pin?

Yes, the TPS3847085DBVT requires a 0.1 µF ceramic bypass capacitor placed as close as possible to the VCC pin and GND. This is mandatory because the device uses a sampling architecture that draws ~12 µA pulses every ~200 ms to refresh its internal reference. Without the capacitor, high-impedance supply paths can cause voltage droop sufficient to trigger false resets. The capacitor stabilizes VCC during these brief current spikes, maintaining reliable supervision in TPS3847085DBVT implementations.

Can the TPS3847085DBVT be used with a 12 V supply rail?

Yes, the TPS3847085DBVT is explicitly rated for supply voltages from 4.5 V to 18 V, making it fully compatible with standard 12 V systems. Its 8.5 V threshold is ideal for detecting brownout conditions on 12 V rails - for example, during automotive cranking events or industrial power sags. The device remains functional up to +105°C junction temperature and maintains ±2.5% threshold accuracy across –40°C to +85°C, ensuring robust operation in TPS3847085DBVT-based 12 V applications.

What is the function of the NC pin on the TPS3847085DBVT?

Pin 3 of the TPS3847085DBVT is labeled NC (No Connection) and has no internal bond wire or circuit connection. It is an unused pad in the SOT-23-5 DBV package. TI specifies that this pin must remain unconnected - neither tied to GND nor VCC. While it may be grounded for mechanical reinforcement in some layouts, doing so provides no electrical benefit and must not create unintended parasitic paths. All functional behavior of the TPS3847085DBVT is independent of the NC pin state.

How does the manual reset (MR) pin operate in the TPS3847085DBVT?

The MR pin on the TPS3847085DBVT is an active-low input that forces the RESET output low regardless of VCC level when pulled below 0.4 V. When MR rises above 1.2 V, RESET returns high only after VCC exceeds 8.5 V and the 20 ms delay elapses. MR leakage is <23 nA at 18 V, allowing direct connection to MCU GPIOs. If unused, TI recommends tying MR to VCC - leaving it floating is prohibited and may cause erratic reset behavior in the TPS3847085DBVT.