Texas Instruments TPS3840PL28DBVRQ1

Overview

TPS3840PL28DBVRQ1 from Texas Instruments is an automotive-grade nano-I_Q voltage supervisor with push-pull active-low RESET output, 2.8 V fixed threshold (±1.5% max), 350 nA typical supply 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 TPS3840PL28DBVRQ1 datasheet, TPS3840PL28DBVRQ1 pinout, TPS3840PL28DBVRQ1 application, or TPS3840PL28DBVRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to +125°C), 100 mV typical hysteresis at 2.8 V, 350 µs max startup delay, and SOT-23-5 (DBV) package compatibility with space-constrained PCB layouts.

Technical Context

The TPS3840PL28DBVRQ1 implements a precision bandgap-referenced comparator with built-in hysteresis and glitch-immune VDD monitoring logic. Its internal state machine asserts RESET when VDD falls below 2.8 V (VIT−) or MR is pulled low, and deasserts only after VDD rises above VIT+ (2.8 V + 100 mV), MR returns high, and the CT-programmed delay t_D expires.

It uses a dedicated CT pin with 500 kΩ internal resistance to interface with external timing capacitors (0–10 µF), enabling precise reset hold times from 50 µs (no cap) to 6.2 s (10 µF). The push-pull output drives RESET directly without external pull-up, supporting sink/source currents up to 2 mA/5 mA across 1.5–10 V VDD range.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3840DL28DBVRQ1, the TPS3840PL28DBVRQ1 eliminates external pull-up components and simplifies layout; compared with MAX6373KATA28+T, it adds MR control and field-adjustable reset timing - critical for automotive functional safety diagnostics.

Availability

TPS3840PL28DBVRQ1 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 TPS3840PL28DBVRQ1 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 delivers ultra-low-power, high-accuracy voltage supervision for automotive safety-critical systems - designed specifically to meet ASIL-B readiness requirements through AEC-Q100 Grade 1 qualification and robust transient immunity.

FAQ

What is the exact threshold voltage of the TPS3840PL28DBVRQ1?

The TPS3840PL28DBVRQ1 has a factory-set negative-going input threshold voltage (VIT−) of 2.8 V, with accuracy of ±1.5% maximum over –40°C to +125°C ambient temperature. This value is laser-trimmed during production and does not require external resistor configuration - confirmed in TI's SNVSBA1B datasheet Section 7.5.

Does the TPS3840PL28DBVRQ1 require an external pull-up resistor on the RESET pin?

No, the TPS3840PL28DBVRQ1 features a push-pull active-low output architecture, meaning it actively drives RESET low during assertion and actively drives it high when released. Unlike open-drain variants (e.g., TPS3840DL28DBVRQ1), no external pull-up resistor is needed - verified in Pin Functions table (Section 6) and Electrical Characteristics (Section 7.5).

How is the reset delay time programmed on the TPS3840PL28DBVRQ1?

The reset delay time (t_D) on the TPS3840PL28DBVRQ1 is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With no capacitor, t_D = 50 µs; with 10 µF, 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 - per Section 8.3.2 and Figure 39 of the datasheet.

Is the TPS3840PL28DBVRQ1 qualified for automotive applications?

Yes, the TPS3840PL28DBVRQ1 is AEC-Q100 qualified for automotive applications, specifically Grade 1 (–40°C to +125°C ambient), with HBM ESD rating ±2000 V and CDM rating ±750 V. It meets requirements for head units, clusters, and telematics - documented in Section 1 "Features" and Section 5 "Device Comparison" of SNVSBA1B.

What is the maximum supply voltage the TPS3840PL28DBVRQ1 can monitor?

The TPS3840PL28DBVRQ1 supports a wide input supply voltage range of 1.5 V to 10 V on the VDD pin, with absolute maximum rating of 12 V. It maintains full functionality - including 2.8 V threshold accuracy and 350 nA I_DD - across this entire range, as specified in Section 7.1 (Absolute Maximum Ratings) and Section 7.3 (Recommended Operating Conditions).