Texas Instruments TPS3840DL32DBVRQ1

Overview

TPS3840DL32DBVRQ1 from Texas Instruments is an automotive-grade nano-I_Q voltage supervisor with open-drain active-low RESET output, 3.2 V fixed threshold (±1.5% max), 350 nA typical quiescent current, and capacitor-programmable reset delay up to 6.2 s-designed for reliable power-on reset in automotive infotainment and ADAS domain controllers.

For engineers reviewing the TPS3840DL32DBVRQ1 datasheet, TPS3840DL32DBVRQ1 pinout, TPS3840DL32DBVRQ1 application, or TPS3840DL32DBVRQ1 equivalent, this page delivers verified electrical parameters, AEC-Q100 Grade 1 qualification details, SOT-23-5 package layout, and validated alternative parts for automotive system-level design and BOM optimization.

Technical Context

The TPS3840DL32DBVRQ1 implements a precision bandgap reference and comparator with built-in hysteresis (100 mV typ. for 3.2 V threshold), glitch-immune VDD monitoring (10 µs immunity at 5% overdrive), and a dedicated CT pin enabling RC-based reset timing without external logic. Its MR input supports manual reset assertion with 600 mV logic-low threshold and internal 100 kΩ pull-up.

It operates across 1.5 V–10 V supply range with VPOR = 950 mV, t_{P_HL} = 30 µs typical propagation delay, and t_STRT ≤ 350 µs startup time-enabling fast, deterministic reset release after power ramp-up while maintaining ultra-low static consumption for always-on vehicle subsystems.

Key Specifications

Pinout & Package

TPS3840DL32DBVRQ1 uses the industry-standard 5-pin SOT-23 (DBV) package (2.90 mm × 1.60 mm), optimized for high-density automotive PCB layouts with thermal performance characterized by R_θJA = 187.5°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3840PL32DBVRQ1, the TPS3840DL32DBVRQ1 offers superior interface flexibility via open-drain output but requires an external pull-up; versus MAX6373LASD+T, it delivers 3.5× lower quiescent current, AEC-Q100 qualification, and full programmability-making it the only choice for modern automotive ASIL-compliant designs requiring configurable timing and robust fault handling.

Availability

TPS3840DL32DBVRQ1 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 long-term production support.

Supply support for TPS3840DL32DBVRQ1 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 with deep automotive expertise and broad manufacturing scale.

The TPS3840-Q1 product line was engineered specifically for automotive power supervision-balancing nano-power operation, AEC-Q100 reliability, and field-programmable timing to replace legacy discrete reset circuits in next-generation E/E architectures.

FAQ

What is the exact threshold voltage and accuracy of the TPS3840DL32DBVRQ1?

The TPS3840DL32DBVRQ1 has a factory-set negative-going input threshold (V_IT−) of 3.2 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 release without chatter during rail recovery. This specification is validated per AEC-Q100 test conditions and appears in Section 7.5 of the official TI datasheet SNVSBA1B.

Does the TPS3840DL32DBVRQ1 require an external pull-up resistor on the RESET pin?

Yes, the TPS3840DL32DBVRQ1 features an open-drain active-low RESET output and requires an external pull-up resistor to the desired logic voltage (e.g., 3.3 V or 5 V). The datasheet recommends a 100 kΩ pull-up for standard timing; lower values improve rise time but increase static current. No pull-up is needed for push-pull variants like TPS3840PL32DBVRQ1, but the TPS3840DL32DBVRQ1's open-drain architecture enables voltage-level translation and wired-OR configurations.

How is the reset delay time (t_D) programmed on the TPS3840DL32DBVRQ1?

The reset delay time (t_D) on the TPS3840DL32DBVRQ1 is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With no capacitor (CT floating), t_D = 50 µs. Using a 10 µF capacitor yields up to 6.2 s delay. The relationship follows t_D = −ln(0.29) × R_CT × C_{CT_EXT} + 50 µs, where R_CT = 500 kΩ (typical). This is confirmed in Section 7.6 and Figure 39 of the TPS3840-Q1 datasheet.

Is the TPS3840DL32DBVRQ1 qualified for automotive use, and what grade does it meet?

Yes, the TPS3840DL32DBVRQ1 is AEC-Q100 qualified for automotive applications. It meets Grade 1 specifications: operating ambient temperature from –40°C to +125°C, HBM ESD rating of ±2 kV, and CDM ESD rating of ±750 V. These qualifications are explicitly stated in the "Features" section of the official TI datasheet SNVSBA1B and verified through TI's certified automotive test reports.

Can the MR pin of the TPS3840DL32DBVRQ1 be left unconnected, and what is its default behavior?

Yes, the MR (Manual Reset) pin of the TPS3840DL32DBVRQ1 can be left unconnected (floating), as it features an internal 100 kΩ pull-up resistor. In this state, MR remains at logic-high, and reset assertion occurs only upon VDD falling below 3.2 V. Pulling MR ≤600 mV asserts reset regardless of VDD level. This behavior is documented in Section 6 ("Pin Functions") and Table 7.5 of the TPS3840-Q1 datasheet.