Texas Instruments TPS3700DDCR

Overview

TPS3700DDCR from Texas Instruments is a high-voltage window voltage detector IC designed for overvoltage and undervoltage monitoring in power-rail supervision systems. It features dual high-accuracy comparators with internal 400 mV reference, 1.8 V to 18 V supply range, ±1.0% threshold accuracy over temperature, 5.5 µA typical quiescent current, and two 18 V-rated open-drain outputs (OUTA/OUTB). It is used in industrial control and automotive power sequencing to assert reset or enable signals when monitored rails deviate from safe operating windows.

For engineers reviewing the TPS3700DDCR datasheet, TPS3700DDCR pinout, TPS3700DDCR application, or TPS3700DDCR equivalent, key selection considerations include its adjustable window thresholds via external resistor dividers, built-in 5.5 mV hysteresis for noise immunity, –40°C to 125°C operation, SOT-6 package compatibility, and independent monitoring capability for separate rails (e.g., 5 V undervoltage + 12 V overvoltage).

Technical Context

The TPS3700DDCR implements two independent comparators: INA+ drives OUTA low on undervoltage (V_IN < V_IT+ – V_HYS), while INB– drives OUTB low on overvoltage (V_IN > V_IT+). Both use the same 400 mV internal reference and share 5.5 mV typical hysteresis to suppress false triggering from rail noise.

Its inputs accept 0–6.5 V regardless of VDD (1.8–18 V), enabling monitoring of higher-voltage rails via external dividers. Outputs are open-drain, rated to sink 40 mA at up to 18 V pull-up, supporting wired-OR logic and interface-level translation across mixed-voltage systems.

Key Specifications

Pinout & Package

SOT-6 (DDC) package: 2.90 mm × 1.60 mm, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809E33DBVR and MAX6816EUT+T, the TPS3700DDCR uniquely delivers dual independent comparators with internal 400 mV reference, 18 V output rating, and programmable window thresholds - enabling single-IC supervision of multiple rails across 1.8–18 V supply ranges without external references or level shifters.

Availability

TPS3700DDCR is available at Aetrix Electronics and suitable for industrial control systems, automotive electronic control units, and embedded computing modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for TPS3700DDCR 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 for industrial and automotive markets.

The TPS3700DDCR belongs to TI's precision voltage supervisor product line, engineered for robust rail monitoring in harsh environments where accuracy, wide supply range, and noise immunity are critical for system reliability.

FAQ

What is the function of the TPS3700DDCR in a power-supply supervision circuit?

The TPS3700DDCR functions as a dual-threshold window voltage detector that independently monitors for undervoltage (via INA+) and overvoltage (via INB–) conditions on DC power rails. It asserts open-drain outputs OUTA and OUTB to trigger system reset or enable signals when monitored voltages fall outside user-defined safe windows set by external resistor dividers. Its internal 400 mV reference and 5.5 mV hysteresis ensure stable, noise-immune operation across –40°C to 125°C.

Can the TPS3700DDCR monitor a 24 V rail?

Yes, the TPS3700DDCR can monitor a 24 V rail using an external resistor divider network connected to INA+ or INB–. The inputs accept up to 6.5 V, so a properly scaled divider (e.g., 1 MΩ + 274 kΩ) reduces the 24 V rail to ≤6.5 V while maintaining accuracy. The device's 18 V-rated open-drain outputs also allow pull-up to 24 V logic levels, making the TPS3700DDCR suitable for high-voltage industrial and automotive applications.

What is the significance of the 5.5 µA quiescent current specification for the TPS3700DDCR?

The 5.5 µA typical quiescent current enables the TPS3700DDCR to operate continuously in battery-backed or energy-harvesting systems without significant drain. This ultra-low power consumption supports always-on supervision in portable medical devices, remote sensors, and automotive standby circuits where minimizing standby current is critical to battery life and thermal management.

How does the TPS3700DDCR handle power supply transients during startup?

The TPS3700DDCR incorporates a 450 µs maximum start-up delay and undervoltage lockout (UVLO) that holds outputs in defined states until VDD exceeds 1.8 V and stabilizes. During VDD ramp-up, OUTA is driven low and OUTB goes high-impedance below UVLO (1.3–1.7 V), preventing false resets. This ensures clean, glitch-free assertion of reset signals after power-on, critical for reliable initialization of MCUs and FPGAs.

Is the TPS3700DDCR pin-compatible with other members of the TPS3700 family?

Yes, the TPS3700DDCR (SOT-6 package) shares identical pinout and functionality with other DDC-package variants such as TPS3700DRCR and TPS3700DRCT. All SOT-6 versions use the same 6-pin layout (OUTA, GND, INA+, INB–, VDD, OUTB) and electrical specifications, enabling drop-in replacement within the same package footprint without PCB redesign.