Texas Instruments TPS3847108DBVR

Overview

TPS3847108DBVR from Texas Instruments is an ultralow-power voltage supervisor IC designed for high-voltage supply monitoring in battery-powered systems. It features a factory-trimmed 10.8 V negative-going threshold (±2.5% accuracy), 380 nA typical supply current, push-pull active-low RESET output, and operates across 4.5 V to 18 V supply range. It is used in lithium-ion battery discharge protection circuits to disable DC/DC converters before critical cell voltage collapse.

For engineers reviewing the TPS3847108DBVR datasheet, TPS3847108DBVR pinout, TPS3847108DBVR application, or TPS3847108DBVR equivalent, key selection criteria include reset threshold accuracy, quiescent current at temperature extremes, MR input compatibility with logic-level control, and SOT-23-5 package suitability for space-constrained portable designs.

Technical Context

The TPS3847108DBVR implements a precision bandgap-based voltage reference with internal resistor divider to generate a fixed 10.8 V detection threshold. Its sampling architecture enables ultralow 380 nA average current while maintaining valid RESET assertion during fast transients via built-in hysteresis (0.378 V) and controlled propagation delays.

It supports dual reset initiation modes: automatic VCC monitoring (with 20 ms max delay after threshold recovery) and manual reset via MR pin (with 50 µs propagation delay). The push-pull output drives bidirectional microcontroller reset lines directly without external pull-up resistors, simplifying interface design in low-noise, low-power systems.

Key Specifications

Pinout & Package

TPS3847108DBVR is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for compact portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3847108DBVR, TPS3840108DBVR offers lower quiescent current but forfeits MR functionality, while MAX6326LT108T provides superior threshold accuracy at the cost of 4× higher supply current and added external component requirements.

Availability

TPS3847108DBVR is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, battery management systems, and automotive telematics requiring stable component supply with long-lifecycle support.

Supply support for TPS3847108DBVR 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, and personal electronics markets.

The TPS3847 family was engineered specifically for ultralow-power, high-voltage supervision in battery-constrained applications - emphasizing sub-µA operation, factory-trimmed thresholds, and robust transient immunity without external components.

FAQ

What is the exact reset threshold voltage of the TPS3847108DBVR and how tightly is it specified?

The TPS3847108DBVR has a factory-trimmed negative-going reset threshold voltage of 10.8 V, with guaranteed accuracy of ±2.5% over the operating temperature range of –40°C to +85°C. At 25°C, the typical threshold is 10.8 V, and the datasheet specifies min/max bounds of 10.53 V and 11.07 V. This precision eliminates the need for external resistor dividers and associated tolerance stacking errors.

Does the TPS3847108DBVR require an external capacitor on the VCC pin, and why?

Yes, the TPS3847108DBVR requires a 0.1 µF ceramic bypass capacitor placed as close as possible to the VCC pin and GND. This is necessary because the device draws ~12 µA for ~500 µs every ~200 ms during internal reference refresh. Without the capacitor, high source impedance can cause voltage droop sufficient to trigger a false reset. The capacitor stabilizes VCC during these brief current pulses, ensuring reliable operation.

Can the TPS3847108DBVR drive a microcontroller's bidirectional reset pin directly?

Yes, the TPS3847108DBVR can drive a bidirectional reset pin directly due to its push-pull output structure. However, TI recommends adding a 47 kΩ series resistor between the RESET pin and the microcontroller to prevent excessive current if both devices attempt to drive the line simultaneously. This protects against latch-up or damage while preserving signal integrity and timing margins.

What is the maximum operating temperature for the TPS3847108DBVR, and is it qualified for automotive use?

The TPS3847108DBVR is specified for operation from –40°C to +85°C, with functional performance verified up to +105°C per typical characteristics data. It is not AEC-Q100 qualified and lacks automotive-grade screening or extended temperature validation. For automotive applications, designers should perform system-level qualification and consider derating or selecting explicitly automotive-qualified alternatives.

How does the MR pin function on the TPS3847108DBVR, and what happens if it's left unconnected?

The MR pin on the TPS3847108DBVR is an active-low manual reset input: pulling it below 0.4 V forces RESET low regardless of VCC level. If left floating, leakage current may cause unpredictable behavior. TI explicitly states the MR pin must not be left unconnected - it should be tied to VCC if unused, or driven by a logic signal meeting V_IL/V_IH specifications. Leaving MR floating risks intermittent resets or failure to assert RESET reliably.