Texas Instruments TPS3701DDCT

Overview

TPS3701DDCT from Texas Instruments is a high-voltage window voltage detector IC with dual precision comparators, internal 400-mV reference, and open-drain outputs (OUTA/OUTB) rated to 25 V. It operates from 1.8 V to 36 V supply, achieves ±0.75% threshold accuracy over temperature, and delivers 5.5 mV typical hysteresis for noise-immune undervoltage/overvoltage monitoring in industrial power rails.

For engineers reviewing the TPS3701DDCT datasheet, TPS3701DDCT pinout, TPS3701DDCT application, or TPS3701DDCT equivalent, this device supports precise window detection of DC supplies (e.g., 24-V ±10% rails), independent dual-voltage monitoring, and reset/enable assertion for MCUs, FPGAs, and DC-DC regulators - all with 7 µA typical quiescent current and –40°C to +125°C operation.

Technical Context

The TPS3701DDCT integrates two independent comparators sharing a trimmed 400-mV internal reference: INA monitors falling thresholds (undervoltage) with VIT–(INA) = 397–403 mV and VIT+(INA) = 400–413 mV; INB monitors rising thresholds (overvoltage) with VIT–(INB) = 387–400 mV and VIT+(INB) = 397–403 mV. Each comparator includes 2–12 mV hysteresis and low input leakage (±25 nA max).

Its open-drain outputs support independent pull-up to voltages up to 25 V - decoupled from VDD - enabling interface with diverse logic families or enable inputs. Startup delay is 155 µs at 5 V, propagation delays are 9.9 µs (HL) and 28.1 µs (LH), and UVLO activates below 1.3–1.7 V to ensure deterministic reset behavior during brownout.

Key Specifications

Pinout & Package

SOT-6 (DDC) package, 2.90 mm × 1.60 mm body size, surface-mount, thermally enhanced for industrial ambient operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809EDBZR and MAX6816EUT+T, the TPS3701DDCT uniquely delivers dual-window detection, 36-V supply tolerance, 25-V output rating, and ±0.75% accuracy - making it the sole option among these three for industrial 24-V system supervision with guaranteed noise immunity and thermal stability.

Availability

TPS3701DDCT is available at Aetrix Electronics and suitable for industrial control systems, embedded computing modules, and FPGA/ASIC power sequencing requiring stable component supply across extended temperature and voltage ranges.

Supply support for TPS3701DDCT 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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability industrial and automotive ICs.

The TPS3701DDCT belongs to TI's precision voltage supervisor product line, engineered specifically for robust over/undervoltage monitoring in harsh environments where supply rail integrity directly impacts system safety and uptime.

FAQ

What is the maximum input voltage allowed on the INA and INB pins of the TPS3701DDCT?

The TPS3701DDCT specifies an absolute maximum input voltage of +7 V on INA and INB pins, regardless of VDD level. This limit is defined in Section 6.1 Absolute Maximum Ratings. Operation above this voltage risks permanent damage. For monitoring voltages exceeding 7 V - such as 24-V rails - an external resistor divider must scale the signal to ≤6.5 V (recommended operating max) before connecting to INA or INB. The TPS3701DDCT itself does not include internal scaling or clamping for high-voltage inputs.

Can the TPS3701DDCT be used as a standalone window detector without external resistors?

No, the TPS3701DDCT cannot function as a window detector without external resistors. Its internal 400-mV reference sets comparator thresholds, but INA and INB require externally divided input voltages to match that reference. For example, detecting a 24-V ±10% window requires a three-resistor network (R1/R2/R3) to generate appropriate threshold voltages at INA and INB. The TPS3701DDCT provides the precision comparators and reference - not the scaling - so external passive components are mandatory for any window application.

What is the purpose of the 5.5-mV typical hysteresis in the TPS3701DDCT?

The 5.5-mV typical hysteresis in the TPS3701DDCT prevents output oscillation when the monitored voltage hovers near a threshold due to noise or ripple. It creates distinct upper (VIT+) and lower (VIT–) trip points - e.g., VIT+(INB) = 400 mV and VIT–(INB) = 394.5 mV - ensuring OUTB remains asserted until the input drops 5.5 mV below the overvoltage trip point. This design eliminates false resets in electrically noisy environments like motor drives or switch-mode power supplies, directly improving system reliability without requiring external RC filtering.

How does the TPS3701DDCT behave during power-up when VDD rises from 0 V?

During power-up, the TPS3701DDCT enters a defined power-on-reset (POR) state: when VDD rises above 0.8 V (V(POR)), outputs remain in high-impedance until VDD exceeds UVLO (1.3–1.7 V) and stabilizes for ≥155 µs. Only then do OUTA and OUTB begin responding to INA/INB voltages per the truth table. Below V(POR), both outputs are high-impedance; between V(POR) and UVLO, OUTA is forced low and OUTB is high-impedance. This staged activation ensures deterministic reset timing for downstream processors, and the TPS3701DDCT implements this behavior internally without external components.

Is the TPS3701DDCT pin-compatible with other members of the TPS37xx family?

Yes, the TPS3701DDCT shares the same SOT-6 (DDC) package and pinout with TPS3700DDCT and TPS3702DDCT. All three devices have identical pin assignments: OUTA (1), GND (2), INA (3), INB (4), VDD (5), OUTB (6). However, functional differences exist - TPS3700 is a single comparator, TPS3702 adds a third comparator, and only TPS3701 provides the dual-comparator window-detection architecture with matched thresholds. So while PCB layout is reusable, firmware and external resistor networks must be validated per device function.