Texas Instruments TPS3840DL18DBVRQ1

Overview

TPS3840DL18DBVRQ1 from Texas Instruments is an automotive-grade nano-I_Q voltage supervisor with open-drain active-low RESET output, 1.8 V fixed threshold (±1.5% max), 350 nA typical quiescent current, and programmable capacitor-based reset delay up to 6.2 s - deployed in engine control units and ADAS domain controllers for reliable power-on reset sequencing.

For engineers reviewing the TPS3840DL18DBVRQ1 datasheet, TPS3840DL18DBVRQ1 pinout, TPS3840DL18DBVRQ1 application, or TPS3840DL18DBVRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to +125°C), 100 mV typical hysteresis at 1.8 V threshold, 350 µs max startup delay, and SOT-23-5 (DBV) package compatibility with space-constrained automotive PCB layouts.

Technical Context

The TPS3840DL18DBVRQ1 implements a precision bandgap-referenced comparator with built-in hysteresis and glitch immunity on VDD, enabling robust detection of supply droop below 1.8 V. Its CT pin interfaces with an external capacitor to set reset timeout via an internal 500 kΩ (typ) resistor, supporting delay tuning from 50 µs (CT floating) to 6.2 s (10 µF).

It features active-low manual reset (MR) with 600 mV logic-low threshold and internal 100 kΩ pull-up, allowing system-level reset initiation independent of VDD status. The open-drain RESET output supports flexible pull-up configurations and wired-OR topology in multi-rail systems.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, JEDEC MO-178AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3840PL18DBVRQ1, the TPS3840DL18DBVRQ1 offers greater flexibility in bus topology and voltage translation but requires a pull-up resistor; versus MAX6371LASD+T, it delivers 4.6× lower quiescent current and field-programmable delay - critical for modern automotive power architectures.

Availability

TPS3840DL18DBVRQ1 is available at Aetrix Electronics and suitable for automotive head units, ADAS domain controllers, and telematics control units requiring stable component supply with full AEC-Q100 traceability and extended temperature support.

Supply support for TPS3840DL18DBVRQ1 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 delivering analog and embedded processing solutions, with leadership in automotive, industrial, and power management ICs.

The TPS3840-Q1 product line was designed specifically for automotive voltage monitoring applications demanding ultra-low quiescent current, high accuracy, and AEC-Q100 qualification across –40°C to +125°C.

FAQ

What is the exact threshold voltage and accuracy of the TPS3840DL18DBVRQ1?

The TPS3840DL18DBVRQ1 has a fixed negative-going input threshold (V_IT−) of 1.8 V with ±1.5% maximum accuracy over –40°C to +125°C ambient temperature. Typical accuracy is ±1%, and hysteresis is 100 mV (typical), ensuring stable reset assertion/deassertion without chatter near the trip point. This specification is verified per TI's production test flow and documented in Section 7.5 of the SNVSBA1B datasheet.

How does the CT pin function in the TPS3840DL18DBVRQ1, and what capacitor values are supported?

The CT pin on the TPS3840DL18DBVRQ1 sets the reset time delay (t_D) via an external capacitor to GND. Supported values range from 0 F (CT floating) to 10 µF, yielding delays from 50 µs to 6.2 s. The internal CT resistance is 500 kΩ (typical), and delay is calculated using t_D = −ln(0.29) × R_CT × C_{CT_EXT} + t_{D(no cap)}. Capacitors beyond 10 µF do not extend delay linearly and are not characterized.

Is the TPS3840DL18DBVRQ1 pin-compatible with other members of the TPS3840-Q1 family?

Yes - all TPS3840-Q1 variants, including TPS3840DL18DBVRQ1, TPS3840PL18DBVRQ1, and TPS3840PH18DBVRQ1, share identical SOT-23-5 (DBV) pinout and footprint. Pin 1 is RESET, Pin 2 is VDD, Pin 3 is GND, Pin 4 is MR, and Pin 5 is CT. Only the output driver topology (open-drain vs. push-pull) and polarity differ; no PCB redesign is needed when substituting within the same threshold variant.

What is the maximum operating voltage and ESD rating of the TPS3840DL18DBVRQ1?

The TPS3840DL18DBVRQ1 supports VDD input from 1.5 V to 10 V, with absolute maximum rating of 12 V. It is qualified to AEC-Q100 with HBM ESD rating of ±2000 V and CDM rating of ±750 V. These ratings are validated per JEDEC JS-001 and JESD22-C101 standards and apply across the full temperature range.

Does the TPS3840DL18DBVRQ1 require an external pull-up resistor on the RESET pin?

Yes - because the TPS3840DL18DBVRQ1 features an open-drain active-low RESET output, an external pull-up resistor to a valid logic rail (e.g., 1.8 V or 3.3 V) is mandatory to establish a defined high state when RESET is deasserted. Typical values range from 10 kΩ to 100 kΩ depending on rise-time and bus loading requirements; TI recommends 100 kΩ in most automotive applications per Figure 9 of SNVSBA1B.