Texas Instruments TPS3840PL27DBVR

Overview

TPS3840PL27DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with push-pull active-low reset output, 2.7 V fixed threshold (±1.5% max), 300 nA typical supply current, and programmable reset delay up to 6.2 s via external capacitor on CT pin. It operates from 1.5 V to 10 V and supports industrial temperature range (–40°C to +125°C), enabling reliable power monitoring in battery-powered smoke detectors and smart meter backup rails.

For engineers reviewing the TPS3840PL27DBVR datasheet, TPS3840PL27DBVR pinout, TPS3840PL27DBVR application, or TPS3840PL27DBVR equivalent, key selection criteria include its 2.7 V threshold accuracy, 220 µs startup delay, push-pull output drive capability (2 mA sink), MR input logic thresholds (V_{MR_L} = 600 mV max), and SOT-23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The TPS3840PL27DBVR implements a precision bandgap-based voltage comparator with built-in hysteresis (100 mV typical for 2.7 V threshold) and glitch-immune detection circuitry. Its internal state machine enforces a user-programmable reset time delay (t_D) after VDD recovery or MR release, preventing premature system enable during brownout recovery.

Unlike open-drain variants, the PL version provides rail-to-rail push-pull output with VOL ≤ 200 mV at 2 mA sink and VOH ≥ 0.8×VDD at 2–5 mA source-eliminating need for external pull-up resistors and simplifying interface with microcontroller reset inputs requiring clean active-low assertion.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm footprint, 5-pin surface-mount, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3840PL27DBVR, the 2.5 V and 3.0 V alternatives maintain identical nano-power operation, programmable delay, and push-pull output-but shift the detection threshold to match different system voltage margins, enabling precise brownout response without redesigning the supervisor interface.

Availability

TPS3840PL27DBVR is available at Aetrix Electronics and suitable for fire safety sensors, smart electricity meters, industrial field transmitters, and portable handheld terminals requiring stable component supply across extended temperature ranges and ultra-low power consumption.

Supply support for TPS3840PL27DBVR 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 for industrial, automotive, and personal electronics markets.

The TPS3840 family was designed specifically for ultra-low-power, high-voltage supervision in battery-critical and harsh-environment applications-emphasizing nanoscale current draw, wide input range, and robust glitch immunity without sacrificing timing precision.

FAQ

What is the exact threshold voltage of the TPS3840PL27DBVR?

The TPS3840PL27DBVR has a factory-trimmed negative-going input threshold voltage (V_IT−) of 2.7 V, with accuracy of ±1.5% maximum over –40°C to +125°C. This value is fixed and non-adjustable-no external resistors or configuration pins alter the trip point. The device uses internal precision trimming to achieve 1% typical accuracy, making it suitable for applications demanding tight voltage monitoring without calibration.

Does the TPS3840PL27DBVR require an external pull-up resistor on the RESET pin?

No, the TPS3840PL27DBVR does not require an external pull-up resistor on the RESET pin because it features a push-pull active-low output stage. Unlike open-drain variants (e.g., TPS3840DL27DBVR), the PL version actively drives both high and low states: it sinks up to 2 mA when asserting RESET low and sources current to pull RESET high after delay expiration. This eliminates external components and improves noise immunity in dense PCB layouts.

How is the reset time delay programmed on the TPS3840PL27DBVR?

The reset time delay (t_D) on the TPS3840PL27DBVR is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With CT floating, t_D defaults to 50 µs. Using a 100 nF capacitor yields ~62 ms delay; a 10 µF capacitor extends t_D to approximately 6.2 s. The relationship follows t_D ≈ 618937 × C_{CT_EXT} + 50 µs, where C_{CT_EXT} is in farads. No resistor is needed-the CT pin has a built-in 500 kΩ internal resistance.

What is the minimum pulse width required on the MR pin to trigger reset in the TPS3840PL27DBVR?

The TPS3840PL27DBVR requires a minimum MR pin low pulse width of 300 ns to reliably assert the RESET output. This specification is guaranteed over full temperature and voltage range (–40°C to +125°C, 1.5 V to 10 V). The MR input includes internal filtering and glitch immunity, so shorter pulses-such as ESD-induced spikes-are rejected. For robust manual reset implementation, designs should ensure GPIO-driven MR signals exceed this duration under worst-case timing conditions.

Can the TPS3840PL27DBVR monitor a 24 V supply directly?

No, the TPS3840PL27DBVR cannot monitor a 24 V supply directly, as its absolute maximum VDD rating is 12 V and recommended operating range is 1.5 V to 10 V. To supervise 24 V rails, an external resistor divider must scale the voltage down to ≤10 V at the VDD pin. Texas Instruments confirms this approach in the datasheet, noting that proper divider design-including power dissipation, leakage, and noise immunity-is essential to maintain accuracy and avoid loading the monitored rail.