Texas Instruments TPS3707-50DGNR

Overview

TPS3707-50DGNR from Texas Instruments is a precision 4.55 V supply-voltage supervisor IC with active-low and active-high RESET outputs, power-fail comparator (PFI/PFO), manual reset input (MR), and 200 ms fixed reset delay - no external capacitor required. It operates from 2 V to 6 V, draws ≤50 µA supply current, and is used in microcontroller-based systems requiring reliable power-on initialization and brownout detection.

For engineers reviewing the TPS3707-50DGNR datasheet, TPS3707-50DGNR pinout, TPS3707-50DGNR application, or TPS3707-50DGNR equivalent, key selection considerations include its dual RESET polarity, absence of watchdog timer (distinguishing it from TPS3705-xx), MSOP-PowerPAD™ 8-pin package, –40°C to 85°C operating range, and compatibility with 5 V rail supervision in industrial and portable electronics.

Technical Context

The TPS3707-50DGNR implements a precision voltage monitor with fixed 4.55 V negative-going threshold (V_IT–) and 70 mV hysteresis for stable reset assertion during supply transients. Its dual RESET outputs (active-low RESET and active-high RESET) enable direct interface with processors requiring either polarity without external logic inversion.

Unlike the TPS3705-xx family, the TPS3707-xx series omits the watchdog timer and WDI/WDO pins, instead dedicating pins 7 and 8 in the MSOP-PowerPAD™ package to complementary RESET signals. The PFI/PFO comparator provides independent monitoring of secondary supplies or battery voltage, with 1.25 V internal reference and 10 mV hysteresis.

Key Specifications

Pinout & Package

TPS3707-50DGNR is housed in an 8-pin MSOP-PowerPAD™ package (3.00 mm × 3.00 mm), thermally enhanced with exposed thermal pad for improved power dissipation (R_θJB = 45.1°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3707-50DR and MAX706CSA+, the TPS3707-50DGNR delivers superior thermal performance in a 3×3 mm footprint and unique dual-polarity reset capability - critical for modern mixed-signal systems needing both reset polarities without added components.

Availability

TPS3707-50DGNR is available at Aetrix Electronics and suitable for industrial programmable controllers, portable medical instrumentation, automotive body control modules, and notebook computer power sequencing requiring stable component supply and long-term manufacturability.

Supply support for TPS3707-50DGNR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The TPS370x family was designed specifically for robust, low-power microprocessor supervision - emphasizing precision threshold accuracy, fixed timing, and integrated power-fail detection in compact packages for space- and reliability-critical applications.

FAQ

What is the exact reset threshold voltage of the TPS3707-50DGNR?

The TPS3707-50DGNR has a guaranteed negative-going input threshold voltage (V_IT–) of 4.55 V with ±3% tolerance over –40°C to 85°C. This value is factory-trimmed and specified in the Electrical Characteristics table (Section 7.5) of the SLVS184F datasheet. It is optimized for reliable supervision of nominal 5 V rails with adequate margin against worst-case 5 V ±5% tolerances.

Does the TPS3707-50DGNR include a watchdog timer?

No, the TPS3707-50DGNR does not include a watchdog timer. Unlike the TPS3705-xx series, the TPS3707-xx family replaces the WDI and WDO pins with a second RESET output (active-high). The device's functional block diagram and Feature Description section (Section 8.3.3) explicitly state that watchdog functionality is exclusive to TPS3705-xx devices.

What is the purpose of the NC pin on the TPS3707-50DGNR?

Pin 8 of the TPS3707-50DGNR is designated NC (No Connection) and is not internally bonded. Per the Pin Functions table (Section 6.1), it serves no electrical function and must be left unconnected or tied to GND - never driven or used as a signal path. This pin exists due to package pinout compatibility with the TPS3705-xx series, which uses it for WDO.

Can the TPS3707-50DGNR monitor a 3.3 V supply?

No - the TPS3707-50DGNR is specifically configured for 5 V rail supervision with a fixed 4.55 V threshold. To monitor a 3.3 V supply, use TPS3707-33DGNR (2.93 V threshold) or TPS3707-30DGNR (2.63 V threshold). The "-50" suffix denotes the 4.55 V variant, and threshold is laser-trimmed per part number; it cannot be adjusted externally.

How does the PFI input work on the TPS3707-50DGNR?

The PFI input on the TPS3707-50DGNR compares an external voltage against an internal 1.25 V reference. When the PFI voltage drops below 1.25 V, the open-drain PFO output pulls low. This enables monitoring of battery voltage or auxiliary supplies using a simple resistor divider - e.g., to detect Li-ion battery discharge below 3.0 V - with 10 mV hysteresis preventing output chatter near the threshold.