Texas Instruments TPS3707-33DG4

Overview

TPS3707-33DG4 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 TPS3707-33DG4 datasheet, TPS3707-33DG4 pinout, TPS3707-33DG4 application, or TPS3707-33DG4 equivalent, key selection criteria include its dual-reset output configuration, 2.93 V threshold with 50 mV hysteresis, SOIC-8 package compatibility, and absence of watchdog functionality-distinguishing it from the TPS3705-xx series.

Technical Context

The TPS3707-33DG4 implements a precision bandgap reference and dual comparators: one monitors VDD against a fixed 2.93 V threshold (VIT–) with 50 mV hysteresis, while the second compares PFI against a 1.25 V internal reference. RESET asserts low when VDD falls below VIT– or MR is pulled low; RESET asserts high under the same conditions, providing complementary reset signaling.

It features no integrated watchdog timer-unlike the TPS3705-xx family-and instead dedicates pins to dual-reset outputs (RESET and RESET) and power-fail monitoring (PFI input, PFO output). Its timing behavior includes 3 µs VDD-to-RESET propagation delay and 200 ms reset assertion duration after power-up or MR deassertion.

Key Specifications

Pinout & Package

TPS3707-33DG4 is supplied in an 8-pin SOIC (D) package, 3.90 mm × 4.90 mm body size, with standard lead pitch and gull-wing leads compatible with automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3707-33DG4, the TPS3707-33DR offers identical supervision performance with logistics optimization, while the MAX706RCSA+ sacrifices PFI capability and dual-output flexibility to match legacy pinouts-making it suitable only where those features are unused.

Availability

TPS3707-33DG4 is available at Aetrix Electronics and suitable for industrial programmable controllers, automotive body electronics, and medical data acquisition systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TPS3707-33DG4 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 and embedded processing solutions, with over 90 years of innovation in power management, signal chain, and control technologies.

The TPS370x family was designed specifically for robust, low-power microprocessor supervision in harsh industrial and automotive environments-emphasizing precision thresholds, dual-output flexibility, and integrated power-fail detection without external components.

FAQ

What is the exact reset threshold voltage for TPS3707-33DG4?

The TPS3707-33DG4 has a guaranteed negative-going input threshold voltage (VIT–) of 2.87 V (min) to 2.98 V (max) over –40°C to +85°C, with 2.93 V typical. This is factory-trimmed to target 3.3 V supply rails with ±3% tolerance and 50 mV hysteresis to prevent oscillation during slow voltage transitions.

Does TPS3707-33DG4 include a watchdog timer?

No, TPS3707-33DG4 does not include a watchdog timer. Unlike the TPS3705-xx series, the TPS3707-xx family replaces watchdog inputs (WDI/WDO) with a second reset output (RESET). The TPS3707-33DG4 provides only VDD supervision, manual reset, and power-fail monitoring-no timeout or retriggering logic is present.

What package type is used for TPS3707-33DG4?

TPS3707-33DG4 uses an 8-pin SOIC (Small Outline Integrated Circuit) package, designated "D" in TI's ordering nomenclature. Its body dimensions are 3.90 mm × 4.90 mm, with standard 1.27 mm lead pitch and gull-wing leads compatible with IPC-7351B land patterns.

How does the power-fail function work on TPS3707-33DG4?

The TPS3707-33DG4's PFI pin accepts a divided-down voltage from a secondary rail (e.g., battery or 5 V supply). When PFI falls below the internal 1.25 V reference, the open-drain PFO output pulls low within 0.5 µs. This allows real-time low-battery or auxiliary rail failure detection independent of the main VDD supervision path.

Can TPS3707-33DG4 operate from a 2.5 V supply?

Yes, TPS3707-33DG4 operates from 2 V to 6 V per its Recommended Operating Conditions. However, its 2.93 V VDD threshold means it will assert reset continuously when supplied with 2.5 V-it is intended to monitor a 3.3 V rail, not be powered from it. For 2.5 V system supervision, use TPS3707-25DG4 instead.