Texas Instruments TPS3840DL20DBVRQ1

Overview

TPS3840DL20DBVRQ1 from Texas Instruments is an automotive-grade nano-I_Q voltage supervisor with open-drain active-low RESET output, 2.0 V fixed threshold (±1.5% max), 350 nA typical quiescent current, and capacitor-programmable 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 TPS3840DL20DBVRQ1 datasheet, TPS3840DL20DBVRQ1 pinout, TPS3840DL20DBVRQ1 application, or TPS3840DL20DBVRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to +125°C), 100 mV typical hysteresis at 2.0 V threshold, 350 µs max startup delay, and SOT-23-5 (DBV) package compatibility with space-constrained automotive PCB layouts.

Technical Context

The TPS3840DL20DBVRQ1 implements a precision bandgap-based comparator with built-in hysteresis and glitch-immune VDD monitoring logic. Its internal reference is trimmed to deliver ±1.5% V_IT− accuracy across temperature, and the CT pin interfaces with an external capacitor to set t_D via a known R_CT (500 kΩ typ) time constant.

It features dual assertion triggers: VDD falling below 2.0 V (with 100 mV hysteresis) or MR pulled low. RESET remains asserted for t_STRT + t_D after VDD rises above V_IT+ and MR is released, ensuring clean deassertion timing critical for microcontroller initialization sequences.

Key Specifications

Pinout & Package

Package: 5-pin SOT-23 (DBV), 2.90 mm × 1.60 mm body size, surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3840PL20DBVRQ1, the TPS3840DL20DBVRQ1 offers open-drain flexibility for multi-source reset arbitration; compared with MAX6375XR20+T, it delivers 5× lower I_Q and full delay/MR configurability essential for modern automotive ECUs.

Availability

TPS3840DL20DBVRQ1 is available at Aetrix Electronics and suitable for automotive head units, ADAS domain controllers, and telematics control units requiring stable component supply with AEC-Q100 compliance and long-term production support.

Supply support for TPS3840DL20DBVRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and power management solutions.

The TPS3840-Q1 product line was designed specifically for automotive voltage monitoring applications demanding ultra-low power, high accuracy, and AEC-Q100 reliability - targeting infotainment, ADAS, and body electronics systems.

FAQ

What is the exact threshold voltage and accuracy of the TPS3840DL20DBVRQ1?

The TPS3840DL20DBVRQ1 has a factory-set negative-going input threshold (V_IT−) of 2.0 V with ±1.5% maximum accuracy over –40°C to +125°C ambient temperature. Typical accuracy is ±1%, and hysteresis is 100 mV (typical), resulting in V_IT+ ≈ 2.1 V. This is confirmed in Section 7.5 of the official datasheet (SNVSBA1B).

Does the TPS3840DL20DBVRQ1 require an external pull-up resistor on the RESET pin?

Yes, the TPS3840DL20DBVRQ1 features an open-drain active-low RESET output and requires an external pull-up resistor to VDD or another logic rail. Typical values range from 10 kΩ to 100 kΩ depending on rise-time and bus loading requirements. This is specified in the "TPS3840DL (Open-Drain)" subsection of Section 7.5.

How is the reset delay time (t_D) programmed on the TPS3840DL20DBVRQ1?

The reset delay time (t_D) is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With no capacitor, t_D = 50 µs; with a 10 µF capacitor, t_D ≈ 6.2 s. The relationship follows t_D = −ln(0.29) × R_CT × C_{CT_EXT} + 50 µs, where R_CT = 500 kΩ (typ). This is detailed in Section 7.6 and Figure 39–41.

Is the TPS3840DL20DBVRQ1 qualified for automotive applications?

Yes, the TPS3840DL20DBVRQ1 is AEC-Q100 qualified for automotive applications (Grade 1: –40°C to +125°C ambient), with HBM ESD rating ±2000 V and CDM rating ±750 V. It meets automotive reliability, thermal, and EMC requirements per TI's production data sheet SNVSBA1B.

What is the function of the MR pin on the TPS3840DL20DBVRQ1?

The MR (Manual Reset) pin is an active-low input that forces RESET assertion when pulled ≤600 mV. It features an internal ~100 kΩ pull-up to VDD, so it may be left floating when unused. Deassertion occurs after t_D expires once MR rises above 0.7×VDD. Timing is verified in Section 7.6 (t_{MR_PW}, t_{MR_RES}, t_{MR_tD}).