Texas Instruments TPS3840DL16DBVR

Overview

TPS3840DL16DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with active-low open-drain reset output, 1.6V fixed threshold voltage (±1.5% max), 300nA typical supply current, and user-programmable reset delay via external capacitor on CT pin. It monitors VDD rails up to 10V in battery-powered or industrial monitoring systems where ultra-low quiescent current and precise brownout detection are critical.

For engineers reviewing the TPS3840DL16DBVR datasheet, TPS3840DL16DBVR pinout, TPS3840DL16DBVR application, or TPS3840DL16DBVR equivalent, key selection considerations include its 1.6V threshold accuracy, SOT-23-5 package footprint, open-drain RESET topology requiring external pull-up, programmable tD from 50µs to 6.2s, and –40°C to +125°C operating range for harsh-environment deployment.

Technical Context

The TPS3840DL16DBVR implements a precision bandgap-referenced comparator with built-in hysteresis (100mV typical for 1.6V–3.0V thresholds) to prevent chatter during voltage recovery. Its internal state machine asserts RESET when VDD falls below 1.6V or MR is pulled low, and holds assertion for a user-defined delay after VDD rises above 1.7V (VIT+ = VIT− + VHYS) and MR releases.

Glitch immunity is achieved via internal filtering on both VDD and MR inputs, with ≥10µs rejection of transients exceeding 5% overdrive. The CT pin integrates a 500kΩ (typical) internal resistor to form an RC timing network with external capacitance, enabling deterministic reset hold times without microcontroller intervention.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90mm × 1.60mm footprint, surface-mount, 5-pin configuration with exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3840PL16DBVR, the TPS3840DL16DBVR offers lower system-level BOM cost (no pull-up needed elsewhere) but requires careful trace routing to minimize RESET node capacitance; versus MAX6326LT16D2T, it delivers 6× lower quiescent current and full delay configurability at the cost of slightly larger design effort for CT capacitor selection.

Availability

TPS3840DL16DBVR is available at Aetrix Electronics and suitable for smart meter monitoring, portable medical sensors, industrial PLC I/O modules, and fire alarm control panels requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for TPS3840DL16DBVR 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, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The TPS3840 family was designed specifically for ultra-low-power voltage supervision in battery-critical and wide-input-voltage applications, emphasizing nanoscale quiescent current, factory-trimmed threshold accuracy, and flexible reset timing without MCU involvement.

FAQ

What is the exact threshold voltage tolerance of the TPS3840DL16DBVR over temperature?

The TPS3840DL16DBVR has a fixed 1.6V negative-going input threshold (VIT−) with ±1.5% maximum deviation across –40°C to +125°C, and ±1% typical accuracy at 25°C. This is verified in Section 6.5 Electrical Characteristics of the TI datasheet, where VIT− accuracy is specified as –1.5% to +1.5% over full temperature range, ensuring reliable brownout detection even in extreme ambient conditions.

Does the TPS3840DL16DBVR require an external pull-up resistor on the RESET pin?

Yes, the TPS3840DL16DBVR features an open-drain active-low RESET output and requires an external pull-up resistor to VDD or another logic rail. Typical values range from 10kΩ to 100kΩ depending on rise time and bus loading requirements. This configuration enables wired-OR reset networks and mixed-voltage interface compatibility, unlike push-pull variants such as TPS3840PL16DBVR.

How is the reset delay time (tD) calculated for a given capacitor value on the CT pin of the TPS3840DL16DBVR?

The reset delay tD for the TPS3840DL16DBVR follows tD = 618937 × CCT_EXT + 50µs, where CCT_EXT is the external capacitor in farads. For example, a 100nF capacitor yields ~62.4ms delay. This equation derives from the internal 500kΩ CT pin resistance and logarithmic discharge behavior, as detailed in Section 7.3.2 of the TI datasheet. Capacitors up to 10µF are supported.

Can the TPS3840DL16DBVR monitor a 9V battery directly without external resistive division?

Yes, the TPS3840DL16DBVR supports direct monitoring of 9V batteries because its VDD input operates from 1.5V to 10V. With a 1.6V threshold, it reliably detects end-of-life voltage drop in alkaline or lithium primary cells. No external resistor divider is needed, eliminating associated power loss and component count-critical for maximizing battery service life in remote sensors.

What is the minimum pulse width required on the MR pin to assert reset on the TPS3840DL16DBVR?

The TPS3840DL16DBVR requires a minimum MR pulse width of 300ns to reliably initiate a reset event, as specified in Section 6.6 Timing Requirements. This short duration allows robust triggering from standard GPIO outputs or debounced mechanical switches while rejecting sub-300ns noise spikes common in industrial environments.