Texas Instruments TPS3840PL16DBVR

Overview

TPS3840PL16DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with push-pull active-low reset output, 1.6V fixed threshold voltage (±1.5% max), 300nA typical supply current, and programmable reset delay up to 6.2s via external capacitor on CT pin. It monitors power rails in battery-powered and industrial systems where ultra-low quiescent current and precise brownout detection are critical.

For engineers reviewing the TPS3840PL16DBVR datasheet, TPS3840PL16DBVR pinout, TPS3840PL16DBVR application, or TPS3840PL16DBVR equivalent, key selection considerations include its 1.6V threshold accuracy, SOT-23-5 package footprint, push-pull output drive capability, MR input logic compatibility, and temperature-stable startup delay (220µs typ) across –40°C to +125°C.

Technical Context

The TPS3840PL16DBVR implements a precision bandgap-referenced comparator with built-in hysteresis (100mV typ for 1.6V–3.0V thresholds) to prevent chatter during voltage recovery. Its internal state machine enforces a user-programmable reset time delay after VDD rises above VIT+ or MR release, ensuring downstream circuitry remains held until stable.

It features glitch immunity on both VDD and MR inputs (10µs minimum pulse rejection at 5% overdrive), low-power-on-reset (VPOR = 300mV) to avoid false resets during slow-ramp power-up, and integrated CT pin resistance (500kΩ typ) enabling accurate delay calculation using t_D = 618937 × C_{CT_EXT} + 50µs.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90mm × 1.60mm footprint, surface-mount, thermally enhanced bottom-side pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3840PL28DBVR, the TPS3840PL16DBVR provides earlier brownout detection for 1.8V/2.5V logic domains; compared with MAX6371UKT16+T, it delivers 4× lower I_DD, integrated MR, and flexible delay tuning - making it superior for long-life, feature-rich embedded supervision.

Availability

TPS3840PL16DBVR is available at Aetrix Electronics and suitable for grid infrastructure monitoring, industrial PLCs, fire safety systems, and portable medical devices requiring stable component supply, extended temperature operation, and long-term lifecycle support.

Supply support for TPS3840PL16DBVR 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-critical and safety-compliant applications - emphasizing nanoscale quiescent current, factory-trimmed accuracy, and robust transient immunity.

FAQ

What is the exact threshold voltage and accuracy of the TPS3840PL16DBVR?

The TPS3840PL16DBVR has a factory-set negative-going input threshold voltage (V_IT−) of 1.6V with ±1.5% maximum accuracy over –40°C to +125°C. Typical accuracy is ±1%, and hysteresis is 100mV (typical) to prevent oscillation during voltage recovery. This specification is confirmed in Section 6.5 of the official TI datasheet SNVSB03E.

Does the TPS3840PL16DBVR require an external pull-up resistor on the RESET pin?

No, the TPS3840PL16DBVR uses a push-pull active-low output architecture, so no external pull-up resistor is required on the RESET pin. It actively drives low (≤200mV at 2mA sink) and high (≥0.8×VDD at 2mA source), unlike open-drain variants such as TPS3840DL16DBVR which mandate an external pull-up.

How is the reset time delay programmed on the TPS3840PL16DBVR?

The reset time delay (t_D) on the TPS3840PL16DBVR is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With no capacitor, t_D = 50µs; with 10µF, t_D ≈ 6.2s. The relationship follows t_D = 618937 × C_{CT_EXT} + 50µs, where C_{CT_EXT} is in farads - verified in Section 7.3.2 of the TPS3840PL16DBVR datasheet.

What is the minimum pulse width required on the MR pin to trigger reset in the TPS3840PL16DBVR?

Per Section 6.6 of the TPS3840PL16DBVR datasheet, the MR pin requires a minimum pulse width of 300ns to reliably initiate a reset. The device also specifies t_{MR_RES} = 700ns propagation delay from MR assertion to RESET activation at VDD = 4.5V, ensuring deterministic response in real-time safety systems.

Can the TPS3840PL16DBVR monitor a 24V supply directly?

No, the TPS3840PL16DBVR absolute maximum VDD rating is 12V. To monitor a 24V rail, an external resistive divider must be used to scale the voltage down to ≤10V (recommended operating max) at the VDD pin. The datasheet explicitly states this configuration in Section 3 and Figure 8-1, confirming safe operation with proper divider design.