Texas Instruments TPS3840DL41DBVRQ1

Overview

TPS3840DL41DBVRQ1 from Texas Instruments is an automotive-grade nano-I_Q voltage supervisor with open-drain active-low RESET output, 4.1 V fixed negative threshold (V_IT−), ±1.5% accuracy over −40°C to +125°C, 350 nA typical supply current, and capacitor-programmable reset delay up to 6.2 s. It monitors core power rails in automotive infotainment and ADAS subsystems where ultra-low power and AEC-Q100 Grade 1 compliance are mandatory.

For engineers reviewing the TPS3840DL41DBVRQ1 datasheet, TPS3840DL41DBVRQ1 pinout, TPS3840DL41DBVRQ1 application, or TPS3840DL41DBVRQ1 equivalent, key selection criteria include its 4.1 V detection threshold, SOT-23-5 (DBV) package compatibility, MR input for manual reset assertion, CT pin for delay tuning, and guaranteed operation across 1.5 V–10 V supply range with <30 µs propagation delay.

Technical Context

The TPS3840DL41DBVRQ1 implements a precision bandgap-based comparator with built-in hysteresis (200 mV typical for V_IT− ≥ 3.1 V) and glitch-immune VDD sensing logic. Its internal state machine asserts RESET when VDD drops below 4.1 V or MR is pulled low, and holds assertion for t_D after VDD rises above 4.3 V and MR releases.

Reset timing is governed by two independent paths: fast startup delay (≤350 µs) and user-programmable t_D (50 µs–6.2 s) set via external capacitor on CT pin. The open-drain output requires an external pull-up and supports bidirectional voltage translation, enabling interface with 1.8 V, 3.3 V, or 5 V microcontrollers.

Key Specifications

Pinout & Package

TPS3840DL41DBVRQ1 uses the industry-standard 5-pin SOT-23 (DBV) package, 2.90 mm × 1.60 mm body size, with gull-wing leads optimized for automated assembly and thermal performance in high-density automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3840PL41DBVRQ1, the TPS3840DL41DBVRQ1 offers voltage-level flexibility via open-drain output but requires external pull-up; compared with MAX6374DS41+T, it delivers 4.5× lower I_DD and full delay/MR configurability at identical threshold accuracy and AEC-Q100 qualification.

Availability

TPS3840DL41DBVRQ1 is available at Aetrix Electronics and suitable for automotive head units, ADAS camera modules, and telematics control units requiring stable component supply with full AEC-Q100 traceability and PPAP support.

Supply support for TPS3840DL41DBVRQ1 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 specializing in analog, embedded processing, and automotive ICs, with decades of automotive qualification expertise and ISO/TS 16949-certified manufacturing.

The TPS3840-Q1 product line was designed specifically for automotive power-rail supervision, combining nano-power operation, high-accuracy thresholding, and robust transient immunity to meet stringent ASIL-B system requirements.

FAQ

What is the exact V_IT− threshold voltage for TPS3840DL41DBVRQ1?

The TPS3840DL41DBVRQ1 has a factory-trimmed negative-going input threshold (V_IT−) of 4.1 V, with ±1.5% maximum deviation across −40°C to +125°C ambient temperature. This value is laser-trimmed during production and verified per AEC-Q100 stress testing; typical accuracy is ±1% at 25°C. The 41 suffix in the part number explicitly denotes the 4.1 V variant.

Can TPS3840DL41DBVRQ1 monitor a 3.3 V rail directly?

No - the TPS3840DL41DBVRQ1 has a fixed 4.1 V V_IT− threshold and cannot directly monitor a 3.3 V rail. To supervise 3.3 V, use an external resistor divider to scale the rail to 4.1 V at VDD (e.g., 100 kΩ top, 41.2 kΩ bottom), ensuring divider current remains <100 nA to avoid loading error. The device's 1.5–10 V operating range supports this configuration.

What is the minimum external capacitor value needed to extend reset delay beyond 50 µs for TPS3840DL41DBVRQ1?

The TPS3840DL41DBVRQ1 achieves its minimum 50 µs reset delay (t_D) with CT pin floating. Any capacitor ≥100 pF connected between CT and GND increases t_D; for example, 1 nF yields ~620 µs, and 10 nF yields ~6.2 ms. Capacitors below 100 pF provide negligible extension and are not recommended due to parasitic sensitivity.

Does TPS3840DL41DBVRQ1 require a bypass capacitor on VDD?

Yes - TI recommends a 0.1 µF to 1 µF ceramic bypass capacitor placed as close as possible to the VDD and GND pins of TPS3840DL41DBVRQ1. This stabilizes the internal regulator during VDD transients and ensures reliable power-on-reset behavior, especially in noisy automotive environments with coupled DC/DC switching noise.

How does the manual reset (MR) function interact with the VDD monitoring in TPS3840DL41DBVRQ1?

In TPS3840DL41DBVRQ1, MR and VDD monitoring are OR'ed: RESET asserts if either VDD falls below 4.1 V or MR is pulled ≤600 mV. RESET deasserts only after both conditions are satisfied - VDD rises above 4.3 V (4.1 V + 200 mV hysteresis) AND MR is released (≥0.7×VDD) - followed by expiration of the programmed t_D delay.