Texas Instruments TPS3700DDCT

Overview

TPS3700DDCT from Texas Instruments is a high-voltage window voltage detector IC designed for overvoltage and undervoltage monitoring in power-rail supervision circuits. It operates from 1.8 V to 18 V, features dual open-drain outputs (OUTA/OUTB), ±1.0% threshold accuracy over temperature, 5.5 µA typical quiescent current, and built-in 5.5 mV hysteresis - enabling reliable detection in industrial control and automotive power systems.

For engineers reviewing the TPS3700DDCT datasheet, TPS3700DDCT pinout, TPS3700DDCT application, or TPS3700DDCT equivalent, key selection considerations include its 400 mV internal reference, independent INA+/INB– input polarity for window configuration, 18 V output voltage rating, –40°C to 125°C operating range, and SOT-23-6 (DDC) package compatibility with space-constrained PCB layouts.

Technical Context

The TPS3700DDCT integrates two precision comparators sharing a trimmed 400 mV internal reference: INA+ drives OUTA low on undervoltage (V_IT+ – V_HYS), while INB– drives OUTB low on overvoltage (V_IT+). Both inputs support 0–6.5 V sensing regardless of VDD, and outputs are rated to sink 40 mA at up to 18 V pull-up voltage.

Its functional modes include normal operation above 1.8 V (with 450 µs max start-up delay), undervoltage lockout (UVLO) between 1.3 V and 1.7 V, and power-on reset (POR) below 0.8 V. Input transient immunity is characterized via minimum pulse duration vs. overdrive curves, and hysteresis remains stable across temperature (5.5–12 mV).

Key Specifications

Pinout & Package

SOT-23-6 (DDC) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, JEDEC MO-178AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6816EUT+T and TLV809EADBZR, the TPS3700DDCT uniquely delivers dual independent comparators with internal 400 mV reference, 18 V output tolerance, and true window functionality in a single SOT-23-6 package - eliminating design compromises in high-voltage, multi-rail supervision.

Availability

TPS3700DDCT is available at Aetrix Electronics and suitable for industrial control systems, automotive electronic control units, and embedded computing modules requiring stable component supply across extended temperature and voltage ranges.

Supply support for TPS3700DDCT 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 leadership in power management, signal chain, and high-reliability ICs.

The TPS3700DDCT belongs to TI's precision voltage supervisor product line, engineered specifically for robust overvoltage/undervoltage monitoring in harsh environments where supply rail stability is critical to system integrity.

FAQ

What is the function of the INA+ and INB– pins on the TPS3700DDCT?

The INA+ pin serves as the noninverting input for the undervoltage comparator, driving OUTA low when the monitored voltage falls below (V_IT+ – V_HYS). The INB– pin is the inverting input for the overvoltage comparator, driving OUTB low when the monitored voltage exceeds V_IT+. Together, they enable precise window detection using external resistor dividers - a core capability of the TPS3700DDCT.

Can the TPS3700DDCT monitor voltages higher than its 18 V VDD supply?

Yes. The TPS3700DDCT INA+ and INB– inputs tolerate up to 6.5 V, but when paired with an external resistor divider, the device can monitor rails as high as 26.4 V (per Figure 18 in the datasheet). The outputs remain compatible with 18 V pull-up voltages, making the TPS3700DDCT suitable for supervising higher-voltage systems like 24 V industrial buses or automotive battery rails.

Does the TPS3700DDCT require external hysteresis components?

No. The TPS3700DDCT includes built-in 5.5 mV typical hysteresis on both comparators to reject noise and prevent false triggering - eliminating the need for external RC networks or Schmitt-trigger configurations. This integrated hysteresis is trimmed and stable across temperature, ensuring consistent performance in noisy environments without additional BOM cost or layout area.

What is the maximum sink current capability of the TPS3700DDCT outputs?

The TPS3700DDCT OUTA and OUTB outputs are each rated to sink up to 40 mA while maintaining VOL ≤ 250 mV (at VDD = 5 V, IO = 5 mA). This allows direct drive of reset inputs, enable pins, or small LEDs without external buffers - a key advantage of the TPS3700DDCT in compact, high-current supervision applications.

How does the TPS3700DDCT behave during power-up and brownout conditions?

During power-up, the TPS3700DDCT requires VDD to exceed 1.8 V for ≥450 µs before outputs stabilize. Below 1.3 V (UVLO), OUTA is forced low and OUTB goes high-impedance; below 0.8 V (POR), both outputs enter high-impedance state. This controlled behavior ensures predictable reset assertion and release - a critical feature of the TPS3700DDCT in safety-critical power sequencing.