Texas Instruments TPS3840DL45DBVRQ1

Overview

TPS3840DL45DBVRQ1 from Texas Instruments is an automotive-grade nano-I_Q voltage supervisor with open-drain active-low RESET output, 4.5 V fixed threshold (±1.5% max), 350 nA typical quiescent current, and programmable capacitor-based reset delay up to 6.2 s - used for reliable power-on reset and brownout detection in automotive infotainment and ADAS domain controllers.

For engineers reviewing the TPS3840DL45DBVRQ1 datasheet, TPS3840DL45DBVRQ1 pinout, TPS3840DL45DBVRQ1 application, or TPS3840DL45DBVRQ1 equivalent, this page delivers verified electrical specs, SOT-23-5 pin functions, automotive AEC-Q100 Grade 1 qualification, and real-world timing behavior including t_STRT ≤ 350 µs and t_{P_HL} = 30 µs typical.

Technical Context

The TPS3840DL45DBVRQ1 implements a precision bandgap-referenced comparator with built-in hysteresis (200 mV typical for V_IT− = 4.5 V), glitch-immune VDD monitoring, and a dedicated CT pin that interfaces with an external capacitor to set reset timeout via RC time constant (R_CT ≈ 500 kΩ internal). It asserts RESET when VDD falls below 4.5 V or MR is pulled low, and releases RESET only after VDD rises above 4.7 V (V_IT+) and t_D expires.

Its open-drain output requires an external pull-up resistor and supports bidirectional voltage translation; manual reset (MR) features internal 100 kΩ pull-up and 600 mV logic-low threshold, enabling compatibility with 1.8 V–5 V host logic without level shifters. The device operates across –40°C to +125°C ambient with VPOR = 950 mV and t_{MR_RES} = 700 ns typical.

Key Specifications

Pinout & Package

TPS3840DL45DBVRQ1 uses a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained automotive PCBs and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3840PL45DBVRQ1, the TPS3840DL45DBVRQ1 trades off higher external component count (pull-up resistor) for voltage translation flexibility and wired-OR capability; versus MAX6326LT45D2T, it adds critical automotive features - programmable delay, MR, and nano-I_Q - at minimal footprint cost.

Availability

TPS3840DL45DBVRQ1 is available at Aetrix Electronics and suitable for automotive head unit, ADAS domain controller, and telematics control unit applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for TPS3840DL45DBVRQ1 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 deep expertise in automotive electronics, power management, and precision analog.

The TPS3840-Q1 product line was engineered specifically for automotive power-supply monitoring - combining ultra-low quiescent current, AEC-Q100 qualification, and programmable timing to replace discrete reset circuits in safety-critical ECUs and infotainment systems.

FAQ

What is the exact threshold voltage and accuracy of the TPS3840DL45DBVRQ1?

The TPS3840DL45DBVRQ1 has a factory-set negative-going input threshold (V_IT−) of 4.5 V with ±1.5% maximum accuracy over –40°C to +125°C ambient temperature. Typical accuracy is ±1%, and hysteresis is 200 mV (typical), resulting in V_IT+ ≈ 4.7 V. This ensures stable reset assertion and release without oscillation during slow VDD transitions.

Does the TPS3840DL45DBVRQ1 require an external pull-up resistor on the RESET pin?

Yes, the TPS3840DL45DBVRQ1 features an open-drain active-low RESET output and requires an external pull-up resistor to a valid supply rail (≤12 V). A 100 kΩ resistor to VDD is commonly used, but values from 10 kΩ to 1 MΩ are supported depending on rise-time and bus loading requirements.

How is the reset delay time programmed on the TPS3840DL45DBVRQ1?

Reset delay (t_D) is programmed by connecting an external capacitor between the CT pin and GND. With CT floating, t_D = 50 µs (included in startup delay). Using a 100 nF capacitor yields ~619 ms delay; a 10 µF capacitor achieves up to 6.2 s. The internal CT resistance is 500 kΩ (typical), defining the RC time constant.

Is the TPS3840DL45DBVRQ1 qualified for automotive applications?

Yes, the TPS3840DL45DBVRQ1 is AEC-Q100 qualified for Grade 1 (–40°C to +125°C ambient), with HBM ESD rating of ±2000 V and CDM rating of ±750 V. It is designed for automotive head units, clusters, telematics, and ADAS systems where reliability under harsh thermal and electrical conditions is mandatory.

What is the quiescent current of the TPS3840DL45DBVRQ1 across its operating range?

The TPS3840DL45DBVRQ1 draws 350 nA typical and 700 nA maximum quiescent current (I_DD) over 1.5 V to 10 V VDD and –40°C to +125°C. This nano-I_Q performance enables multi-year battery operation in always-on automotive modules such as remote keyless entry and telematics gateways.