Texas Instruments TPS3840PH30DBVR

Overview

TPS3840PH30DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with push-pull active-high reset output, 3.0 V fixed threshold (±1.5% max), 300 nA typical supply current, and user-programmable reset delay up to 6.2 s via external capacitor on CT pin. It monitors power rails in battery-powered industrial sensors and smart meters.

For engineers reviewing the TPS3840PH30DBVR datasheet, TPS3840PH30DBVR pinout, TPS3840PH30DBVR application, or TPS3840PH30DBVR equivalent, key selection criteria include its 3.0 V threshold accuracy, 100 mV hysteresis (typical), –40°C to +125°C operation, SOT-23-5 package, and active-high push-pull output topology.

Technical Context

The TPS3840PH30DBVR implements a precision bandgap-based voltage comparator with built-in hysteresis and glitch immunity on both VDD and MR inputs. Its internal CT pin circuitry provides a 500 kΩ (typical) pull-down resistance enabling programmable reset timing using an external capacitor.

It operates across 1.5 V to 10 V supply range, asserts RESET high when VDD falls below 3.0 V or MR is pulled low, and holds RESET high for tD after VDD rises above VIT+ (3.1 V) and MR releases - supporting robust power-up sequencing and fault recovery in safety-critical infrastructure monitoring.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3840PL30DBVR and MAX6326US30D3+, the TPS3840PH30DBVR uniquely delivers active-high push-pull output with nano-power consumption and field-programmable reset timing - critical for battery-constrained systems requiring direct MCU interface and adaptive fault-hold duration.

Availability

TPS3840PH30DBVR is available at Aetrix Electronics and suitable for smart metering, industrial field transmitters, fire safety systems, and portable gas monitors requiring stable component supply across extended temperature and long-life battery operation.

Supply support for TPS3840PH30DBVR 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, high-voltage supervision in battery-backed infrastructure and industrial sensing - emphasizing nanoscale quiescent current, wide-V_IN operation, and flexible reset timing.

FAQ

What is the exact threshold voltage of the TPS3840PH30DBVR?

The TPS3840PH30DBVR has a factory-set negative-going input threshold (V_IT−) of 3.0 V, with accuracy of ±1.5% maximum over –40°C to +125°C. This value is laser-trimmed during production and does not require external resistor networks. The corresponding hysteresis (V_HYS) is 100 mV (typical), yielding V_IT+ = 3.1 V for release hysteresis.

Does the TPS3840PH30DBVR require an external pull-up resistor on the RESET pin?

No, the TPS3840PH30DBVR uses a push-pull active-high output stage, so the RESET pin actively drives high during assertion and low during deassertion. Unlike open-drain variants, it requires no external pull-up resistor - simplifying BOM and PCB layout while ensuring defined logic levels under all conditions.

How is the reset time delay (t_D) programmed on the TPS3840PH30DBVR?

The reset time delay is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With no capacitor, t_D = 50 µs (typical). Using a 10 µF capacitor yields up to 6.2 s delay. The relationship follows t_D ≈ 618937 × C_{CT_EXT} + 50 µs, where C_{CT_EXT} is in farads. CT pin must not be shorted or driven externally.

What is the minimum supply voltage required for the TPS3840PH30DBVR to function correctly?

TPS3840PH30DBVR operates down to 1.5 V supply (V_DD). Below this, the internal bandgap and comparator may not stabilize. Its Power-On Reset (VPOR) voltage is 950 mV - meaning RESET remains asserted until V_DD rises above this level, ensuring predictable initialization even with slow-rising supplies.

Can the TPS3840PH30DBVR monitor a 24 V rail directly?

No - the absolute maximum V_DD rating is 12 V. To monitor a 24 V rail, an external resistive divider must scale the voltage to ≤10 V (recommended operating max) before connecting to VDD. The TPS3840PH30DBVR's wide 1.5–10 V range supports direct monitoring of 9 V batteries or 12 V systems without dividers.