Texas Instruments TPS3700DDCR2

Overview

TPS3700DDCR2 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 open-drain outputs (OUTA/OUTB), an internal 400-mV reference with ±1.0% accuracy over temperature, 1.8 V to 18 V supply range, and built-in 5.5 mV hysteresis. It is used in industrial control systems to monitor 12-V rails for ±10% deviations before asserting reset signals to microcontrollers.

For engineers reviewing the TPS3700DDCR2 datasheet, TPS3700DDCR2 pinout, TPS3700DDCR2 application, or TPS3700DDCR2 equivalent, key selection considerations include its dual-threshold window detection capability, 18-V output rating independent of VDD, low 5.5-µA quiescent current, –40°C to 125°C operation, and SOT-6 package compatibility with space-constrained embedded power monitors.

Technical Context

The TPS3700DDCR2 integrates two precision comparators sharing a single 400-mV internal reference: INA+ drives OUTA on falling threshold (VIT+ – VHYS), while INB– drives OUTB on rising threshold (VIT+). Both inputs accept 0–6.5 V regardless of VDD, enabling rail-agnostic monitoring via external resistor dividers.

Its open-drain outputs support pull-up to voltages up to 18 V-decoupled from VDD-allowing direct interface to diverse reset/enable inputs (e.g., 3.3-V MCU reset, 12-V regulator enable). Internal hysteresis (5.5 mV typical) filters noise without external components, and propagation delays are specified at 18 µs (tPHL) and 29 µs (tPLH) under 10-mV overdrive.

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 detection applications.

Compared with TLV809E33DBVR and MAX6816EUT+T, the TPS3700DDCR2 uniquely delivers true window detection with independently configurable over/undervoltage thresholds, 18-V output compatibility, and sub-1% accuracy-making it the only viable option for robust, multi-rail industrial supervision where both OV and UV faults must be distinguished and acted upon separately.

Availability

TPS3700DDCR2 is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, and embedded computing modules requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS3700DDCR2 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, embedded processing, and power management technologies with over 50 years of industrial-grade product leadership.

The TPS3700DDCR2 belongs to TI's precision voltage supervisor product line, engineered specifically for high-reliability overvoltage/undervoltage monitoring in harsh environments where rail stability directly impacts system safety and data integrity.

FAQ

What is the function of the INA+ and INB– pins on the TPS3700DDCR2?

The INA+ pin serves as the noninverting input for the undervoltage comparator: when voltage at INA+ drops below (VIT+ – VHYS), OUTA is driven low. The INB– pin is the inverting input for the overvoltage comparator: when voltage at INB– exceeds VIT+, OUTB is driven low. Together they enable window detection using external resistor dividers. Both pins accept 0–6.5 V regardless of VDD, and exhibit ultra-low input bias current (±25 nA max on INA+, ±15 nA max on INB–) to minimize divider error in the TPS3700DDCR2.

Can the TPS3700DDCR2 monitor a 24-V rail despite its 18-V VDD limit?

Yes. The TPS3700DDCR2 INA+ and INB– inputs are rated for 0–6.5 V, independent of VDD. To monitor a 24-V rail, use an external resistor divider to scale the voltage down to ≤6.5 V at the input pins. For example, a 1 MΩ + 274 kΩ divider yields ~5.4 V at the input for 24 V applied. The internal 400-mV reference remains accurate, and the TPS3700DDCR2 maintains ±1.0% threshold accuracy across temperature. Output pull-up can still be to 24 V since OUTA/OUTB are rated to 18 V - for >18 V rails, add a level-shifting transistor stage.

What is the minimum recommended pull-up resistor value for TPS3700DDCR2 outputs?

The TPS3700DDCR2 outputs are open-drain and rated to sink 40 mA maximum. Minimum pull-up resistance depends on required rise time and bus capacitance. For a 100-pF load and 1-µs rise time, RPU ≤ 10 kΩ (per τ = R×C). However, to ensure VOL ≤ 250 mV at 5 mA sink current, RPU must be ≤ (VPU – 0.25 V)/0.005 A. With 5-V pull-up, RPU ≤ 950 Ω; with 12-V pull-up, RPU ≤ 2.35 kΩ. TI recommends 10 kΩ for general-purpose use - balancing speed, power, and noise immunity in the TPS3700DDCR2.

Does the TPS3700DDCR2 require external hysteresis components?

No. The TPS3700DDCR2 includes built-in hysteresis of 5.5 mV (typical), which is trimmed and temperature-stable. This eliminates the need for external positive feedback resistors or Schmitt-trigger configurations. The internal hysteresis ensures clean, glitch-free output transitions even in noisy environments - a key design advantage confirmed in the TPS3700DDCR2 datasheet's Typical Characteristics section (Figure 4: Hysteresis vs Temperature).

How does the TPS3700DDCR2 behave during power-up and brownout conditions?

During power-up, the TPS3700DDCR2 asserts a power-on reset (POR) when VDD exceeds 0.8 V, holding outputs in defined states after a 450-µs max start-up delay. During brownout, when VDD falls below 1.3 V (UVLO threshold), OUTA is driven low and OUTB enters high-impedance - ensuring predictable fault signaling. Below 0.8 V (V(POR)), both outputs go high-impedance. This three-stage behavior (POR → UVLO → power-off) is fully characterized in the TPS3700DDCR2 Electrical Characteristics table and guarantees safe system reset sequencing.