Texas Instruments 2T03-01QDCKRG4Q1

Overview

2T03-01QDCKRG4Q1 from Texas Instruments is an automotive-grade adjustable voltage supervisor IC that monitors a single system supply rail via its SENSE input, asserts an active-low open-drain RESET signal when voltage drops below 1.226 V (±1.5%), and operates from 1.3 V to 6 V with only 3 µA typical supply current. It is used in microcontroller reset supervision for automotive infotainment and ADAS control modules.

For engineers reviewing the 2T03-01QDCKRG4Q1 datasheet, 2T03-01QDCKRG4Q1 pinout, 2T03-01QDCKRG4Q1 application, or 2T03-01QDCKRG4Q1 equivalent, key selection considerations include its ±1.5% threshold accuracy, –40°C to 125°C operation, SC-70 package footprint, open-drain output requiring external pull-up, and dual-supply monitoring capability when paired with resistor divider networks.

Technical Context

The 2T03-01QDCKRG4Q1 implements a precision bandgap reference and comparator with built-in 15 mV hysteresis to prevent false resets during supply transients. Its SENSE input accepts externally scaled voltages down to 1.226 V using a two-resistor divider, while VDD powers the internal circuitry and serves as the reference for the fixed 1.226 V internal threshold.

During power-on, RESET remains asserted until VDD exceeds 0.8 V, then transitions to monitoring mode. The device rejects short negative transients on SENSE or VDD if their duration and overdrive magnitude fall below curves defined in Figure 15–16 of the datasheet, ensuring robust operation in noisy automotive environments.

Key Specifications

Pinout & Package

2T03-01QDCKRG4Q1 is housed in a 5-pin SC-70 (DCK) package with 2.00 mm × 1.25 mm body size and 0.65 mm pitch. Pin 1 and Pin 5 are no-connect (NC) terminals with no internal connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2T03-01QDCKRG4Q1, TPS3803-01QDCKRQ1 offers identical supervision performance with standard TI part numbering, while 2T03G15QDCKRG4Q trades adjustability for simplified 1.5 V monitoring-making the former ideal for flexible designs and the latter for optimized BOMs in fixed-rail systems.

Availability

2T03-01QDCKRG4Q1 is available at Aetrix Electronics and suitable for automotive infotainment, advanced driver assistance systems (ADAS), and digital instrument cluster applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 2T03-01QDCKRG4Q1 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 specializing in analog and embedded processing technologies, with decades of leadership in automotive electronics and high-reliability power management solutions.

The TPS380x-Q1 family was designed specifically for automotive voltage supervision-delivering AEC-Q100 qualified, low-current, high-accuracy reset generation for DSPs, MCUs, and processors in harsh thermal and EMI environments.

FAQ

What is the exact threshold voltage of the 2T03-01QDCKRG4Q1 and how is it set?

The 2T03-01QDCKRG4Q1 has a fixed internal reference of 1.226 V with ±1.5% accuracy over temperature. This threshold applies to the SENSE pin; users configure the monitored supply voltage using an external resistor divider (R1/R2) such that V_SENSE = V_IN × R2/(R1+R2). When V_SENSE drops below 1.226 V, the 2T03-01QDCKRG4Q1 asserts RESET. No trimming or calibration is required.

Does the 2T03-01QDCKRG4Q1 support dual-supply monitoring like the TPS3805H33-Q1?

No-the 2T03-01QDCKRG4Q1 monitors only one supply via the SENSE pin, while VDD powers the IC itself. Unlike the TPS3805H33-Q1, it does not monitor VDD for reset assertion. To supervise two rails with the 2T03-01QDCKRG4Q1, you must use separate instances or pair it with another supervisor; dual-monitoring capability is exclusive to the TPS3805-Q1 series.

What is the purpose of the NC pins on the 2T03-01QDCKRG4Q1 SC-70 package?

Pins 1 and 5 of the 2T03-01QDCKRG4Q1 are designated NC (no connection) and have no internal bond wire or silicon connection. They must remain unconnected on the PCB layout. Leaving them floating or tying them to GND/VDD may introduce parasitic capacitance or leakage paths that affect SENSE accuracy or transient immunity-TI explicitly specifies these pins as unused.

Can the 2T03-01QDCKRG4Q1 operate from a 1.3 V supply on VDD?

Yes-the 2T03-01QDCKRG4Q1 supports VDD from 1.3 V to 6 V per its Recommended Operating Conditions. At 1.3 V, the internal circuitry remains functional and RESET assertion/deassertion behavior is guaranteed, though the open-drain output will not drive high (as there is no pull-up source on chip); external pull-up voltage must be ≥1.3 V and compatible with the host logic family.

How does the 2T03-01QDCKRG4Q1 handle power-up sequencing and brownout detection?

At power-up, the 2T03-01QDCKRG4Q1 asserts RESET when VDD rises above 0.8 V, then enters monitoring mode. It continuously compares SENSE against 1.226 V; if SENSE drops below threshold, RESET is held low until SENSE rises above 1.226 V + 15 mV hysteresis. This ensures clean release after brownout recovery and prevents oscillation near trip point.