Texas Instruments TPS3840PL30DBVRQ1

Overview

TPS3840PL30DBVRQ1 from Texas Instruments is an automotive-grade nano-I_Q voltage supervisor with push-pull active-low reset output, 3.0 V fixed threshold (±1.5% max), 350 nA typical quiescent current, and programmable capacitor-based 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 TPS3840PL30DBVRQ1 datasheet, TPS3840PL30DBVRQ1 pinout, TPS3840PL30DBVRQ1 application, or TPS3840PL30DBVRQ1 equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification (–40°C to +125°C), 30 µs typical propagation delay (t_{P_HL}), 350 µs max startup delay, and SOT-23-5 (DBV) package compatibility with space-constrained automotive PCB layouts.

Technical Context

The TPS3840PL30DBVRQ1 implements a precision bandgap-referenced comparator with built-in hysteresis (100 mV typ. for 3.0 V threshold) and glitch immunity on VDD, ensuring robust reset assertion during supply transients. Its internal CT pin resistor (500 kΩ typ.) enables accurate RC-based delay programming without external components beyond the timing capacitor.

It operates across 1.5 V to 10 V supply range while maintaining sub-µA quiescent current over full temperature range, and integrates manual reset (MR) with internal 100 kΩ pull-up and logic-level thresholds (V_{MR_L} = 600 mV max, V_{MR_H} = 0.7×V_DD min), supporting direct interface to microcontroller GPIOs.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3840DL30DBVRQ1, the TPS3840PL30DBVRQ1 eliminates external pull-up components and simplifies layout; versus MAX6373LASD30+T, it delivers automotive qualification, 5× lower quiescent current, and field-programmable reset timing - making it optimal for next-gen connected vehicle ECUs.

Availability

TPS3840PL30DBVRQ1 is available at Aetrix Electronics and suitable for automotive head unit, ADAS domain controller, and telematics control unit applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for TPS3840PL30DBVRQ1 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 and embedded processing solutions, with deep expertise in automotive electronics, power management, and precision analog ICs.

The TPS3840-Q1 product line was designed specifically for automotive voltage monitoring - combining ultra-low power, high accuracy, and programmable timing to replace discrete reset circuits in safety-critical and battery-sensitive vehicle subsystems.

FAQ

What is the exact threshold voltage tolerance for TPS3840PL30DBVRQ1 over temperature?

The TPS3840PL30DBVRQ1 has a fixed 3.0 V negative-going input threshold (V_IT-) with ±1.5% maximum deviation across –40°C to +125°C ambient temperature, as specified in Section 7.5 of the datasheet. Typical accuracy is ±1%, and hysteresis is 100 mV (typical) - ensuring reliable trip and release points even under thermal stress. This specification applies directly to the TPS3840PL30DBVRQ1 variant.

Does TPS3840PL30DBVRQ1 require an external pull-up resistor on the RESET pin?

No, the TPS3840PL30DBVRQ1 features a push-pull active-low RESET output, meaning it actively drives low during reset assertion and high during normal operation. Unlike open-drain variants (e.g., TPS3840DL30DBVRQ1), it does not require an external pull-up resistor - reducing component count and PCB footprint. This behavior is confirmed in the Pin Functions table (Section 6) and Electrical Characteristics (Section 7.5).

How is the reset delay time calculated when using a capacitor on the CT pin of TPS3840PL30DBVRQ1?

The reset delay time (t_D) for TPS3840PL30DBVRQ1 is calculated using t_D = –ln(0.29) × R_CT × C_{CT_EXT} + t_{D(no cap)}, where R_CT = 500 kΩ (typical), t_{D(no cap)} = 50 µs, and C_{CT_EXT} is the external capacitor (0–10 µF). For example, a 100 nF capacitor yields ~250 ms delay. This equation is defined in Section 8.3.2 and validated in Figure 39 of the TPS3840-Q1 datasheet.

Is TPS3840PL30DBVRQ1 compatible with 1.8 V microcontroller I/O for the MR pin?

Yes - the MR pin of TPS3840PL30DBVRQ1 accepts logic-low signals down to 600 mV (max) and logic-high signals ≥0.7×V_DD. When V_DD = 3.3 V, V_{MR_H} ≥ 2.31 V, which is safely exceeded by 1.8 V GPIOs driving MR low (since MR is active-low and only requires <600 mV to assert). No level-shifter is needed for MR control from 1.8 V domains, as confirmed in Section 7.5 Electrical Characteristics.

What is the maximum capacitor value supported on the CT pin of TPS3840PL30DBVRQ1?

The CT pin of TPS3840PL30DBVRQ1 supports external capacitors up to 10 µF, enabling a maximum reset delay of 6.2 seconds. Capacitors larger than 10 µF do not extend delay linearly and may degrade accuracy or cause instability due to leakage and parasitic effects. This limit is explicitly stated in Section 7.6 Timing Requirements and Figure 39 of the official datasheet for TPS3840-Q1.