Texas Instruments TPS3707-33DGNR

Overview

TPS3707-33DGNR from Texas Instruments is a precision 3.3 V supply-voltage supervisor IC with active-low and active-high RESET outputs, fixed 200 ms power-on reset delay, power-fail comparator (PFI/PFO), and manual reset input (MR). It operates from 2 V to 6 V, draws ≤50 µA supply current, and is rated for –40°C to 85°C. It is used in microcontroller-based systems requiring reliable power sequencing and brownout detection.

For engineers reviewing the TPS3707-33DGNR datasheet, TPS3707-33DGNR pinout, TPS3707-33DGNR application, or TPS3707-33DGNR equivalent, key selection criteria include its dual-reset output configuration, 2.93 V threshold with 50 mV hysteresis, MSOP-PowerPAD™ 8-pin package, absence of watchdog timer (distinguishing it from TPS3705-xx), and compatibility with industrial and embedded power-monitoring designs.

Technical Context

The TPS3707-33DGNR implements dual-output supervision using an internal 1.25 V reference and precision resistor divider to set V_IT– = 2.93 V (±70 mV over temperature). It asserts active-low RESET when V_DD falls below threshold and active-high RESET when V_DD rises above threshold - enabling direct interface with both reset-active-low and reset-active-high processors.

Its PFI input monitors auxiliary rails (e.g., battery or secondary supply) with 1.25 V threshold and 10 mV hysteresis, driving PFO low on undervoltage. MR provides asynchronous reset assertion. No external capacitor is needed for the 200 ms reset timeout, and all timing is internally generated.

Key Specifications

Pinout & Package

TPS3707-33DGNR is housed in an 8-pin MSOP-PowerPAD™ package (3.00 mm × 3.00 mm body), 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 TPS3707-33DGNR, the SOIC variant offers easier hand-soldering but sacrifices thermal performance and board density; the MAX706TESA+ provides legacy compatibility but omits critical features like PFI monitoring and active-high RESET, increasing system-level design effort.

Availability

TPS3707-33DGNR is available at Aetrix Electronics and suitable for industrial automation, portable medical devices, automotive infotainment, and network edge gateways requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for TPS3707-33DGNR 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 supervisory circuits.

The TPS370x-xx product line was designed specifically for robust, low-power microprocessor supervision in industrial, automotive, and portable applications - emphasizing precision thresholds, dual-output flexibility, and integrated power-fail detection.

FAQ

What is the exact supply voltage threshold for TPS3707-33DGNR?

The TPS3707-33DGNR has a nominal negative-going input threshold voltage (V_IT–) of 2.93 V, with tolerance of ±70 mV over the full –40°C to +85°C operating range. This value is factory-trimmed and specified in Section 7.5 of the datasheet. The threshold applies to the V_DD pin and is used to determine when the RESET outputs change state. TPS3707-33DGNR does not require external calibration or trimming.

Does TPS3707-33DGNR include a watchdog timer?

No, TPS3707-33DGNR does not include a watchdog timer. Unlike the TPS3705-xx series, the TPS3707-xx family replaces the watchdog input/output (WDI/WDO) pins with a second RESET output. Pin 1 and Pin 2 of TPS3707-33DGNR are both RESET outputs (active-high and active-low), and Pins 6 and 8 are dedicated to PFI and NC respectively. This distinction is explicitly stated in Section 8.3.3 of the datasheet.

What is the function of the NC pin on TPS3707-33DGNR?

Pin 8 of TPS3707-33DGNR is designated NC (No Connection) - it has no internal bond wire and serves no electrical function. Per TI's layout guidance, this pin may be left floating or connected to GND to improve mechanical stability and thermal conduction through the PowerPAD™. It must never be driven or used as a signal node, as doing so could compromise device reliability or ESD performance.

Can TPS3707-33DGNR monitor a 5 V supply?

TPS3707-33DGNR is optimized for 3.3 V supervision (2.93 V threshold) and cannot directly monitor a 5 V supply - applying 5 V to V_DD exceeds its 6 V absolute maximum rating only under transient conditions, but sustained operation at 5 V violates its recommended 2–6 V range and risks incorrect threshold behavior. To monitor a 5 V rail, use the PFI input with a resistor divider to scale the voltage down to ≤1.25 V, or select TPS3707-50DGNR (4.55 V threshold).

What decoupling capacitor is recommended for TPS3707-33DGNR?

A 0.1 µF ceramic capacitor is required between V_DD and GND, placed as close as possible to the TPS3707-33DGNR package. This is specified in Section 11.1 (Layout Guidelines) and Figure 11-1 of the datasheet to suppress high-frequency noise and ensure stable internal reference operation. Larger bulk capacitance (e.g., 1–10 µF) may be added nearby for system-level filtering, but the 0.1 µF local cap is mandatory for TPS3707-33DGNR functional integrity.