Texas Instruments TPS3840PH18DBVR

Overview

TPS3840PH18DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with push-pull active-high reset output, 1.8 V fixed threshold (±1.5% accuracy), 300 nA typical supply current, and user-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 and wide-rail systems.

For engineers reviewing the TPS3840PH18DBVR datasheet, TPS3840PH18DBVR pinout, TPS3840PH18DBVR application, or TPS3840PH18DBVR equivalent, this page delivers verified electrical specifications, exact SOT-23-5 pin functions, real-world use cases in grid infrastructure and portable electronics, and two validated alternative parts with documented functional differences.

Technical Context

The TPS3840PH18DBVR implements a precision voltage comparator with built-in hysteresis (100 mV typical for 1.8 V threshold) and glitch-immune detection logic. Its internal bandgap reference and low-leakage design enable stable threshold monitoring across –40°C to +125°C without external components.

Reset assertion occurs when VDD falls below 1.8 V (VIT−) or MR is pulled low; deassertion requires VDD > 1.9 V (VIT+ = VIT− + VHYS) and expiration of programmable tD. The CT pin integrates a 500 kΩ internal resistor (typical) to convert external capacitance into precise time delay per TI's validated equation tD ≈ 618937 × CCT_EXT + 50 µs.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm footprint, surface-mount, thermally efficient for space-constrained PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3840PH18DBVR, the PL18 variant offers identical supervision accuracy and nano-power performance but requires active-low reset compatibility, while MAX6375XR29+T trades programmability and ultra-low current for lower unit cost in fixed-threshold, line-powered systems.

Availability

TPS3840PH18DBVR is available at Aetrix Electronics and suitable for grid infrastructure monitoring, portable medical sensors, and industrial PLC I/O modules requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS3840PH18DBVR 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, with over 90 years of innovation in power management, signal chain, and sensing technologies.

The TPS3840 family was designed specifically for ultra-low-power, wide-input-voltage supervision in battery-backed and industrial equipment - prioritizing nanoscale current draw, factory-trimmed accuracy, and field-programmable timing without firmware dependency.

FAQ

What is the exact threshold voltage and accuracy of TPS3840PH18DBVR?

The TPS3840PH18DBVR has a factory-set negative-going input threshold (VIT−) of 1.8 V with ±1.5% maximum accuracy over –40°C to +125°C and 1% typical accuracy at 25°C. This value is laser-trimmed during production and does not require external calibration. Hysteresis is 100 mV typical, resulting in VIT+ = 1.9 V, ensuring stable release behavior during VDD recovery.

How does the CT pin program reset delay in TPS3840PH18DBVR?

The CT pin in TPS3840PH18DBVR connects internally to a 500 kΩ resistor (typical). When an external capacitor (CCT_EXT) is placed between CT and GND, it forms an RC network that sets the reset time delay tD using tD ≈ 618937 × CCT_EXT + 50 µs. With no capacitor, tD = 50 µs; with 10 µF, tD ≈ 6.2 s. The CT pin must remain floating or grounded - never driven by external logic.

Can TPS3840PH18DBVR monitor a 24 V rail directly?

No, TPS3840PH18DBVR cannot monitor 24 V directly - its absolute maximum VDD rating is 12 V. To supervise a 24 V rail, use a precision resistive divider (e.g., 10:1 ratio) to scale the voltage down to ≤10 V at the VDD pin. Ensure divider resistor values minimize current draw (e.g., 1 MΩ top, 100 kΩ bottom) and maintain noise immunity with local bypass capacitance.

What is the function of the MR pin on TPS3840PH18DBVR?

The MR (Manual Reset) pin on TPS3840PH18DBVR is an active-low digital input. Pulling MR below 600 mV (V_{MR_L}) for ≥300 ns forces immediate RESET assertion regardless of VDD level. When MR is floating or held above 0.7×VDD (V_{MR_H}), the device relies solely on VDD monitoring. MR requires no external pull-up due to internal 100 kΩ resistor.

Is TPS3840PH18DBVR compatible with systems requiring active-high reset signals?

Yes - TPS3840PH18DBVR features a push-pull active-high RESET output, meaning it drives logic high during reset and returns to logic low when released. This eliminates the need for external pull-up resistors and directly interfaces with processors, FPGAs, and ASICs specifying active-high reset inputs, unlike open-drain or active-low variants which require additional level-shifting or inversion.