Texas Instruments TPS3307-33DGNR

Overview

TPS3307-33DGNR from Texas Instruments is a triple-voltage supervisor IC designed for DSP, microcontroller, and microprocessor systems requiring independent monitoring of 5V, 3.3V, and adjustable supply rails. It features fixed 200ms power-on reset delay, 40µA supply current, 2V–6V operating range, and dual active-low/active-high RESET outputs in an 8-pin HVSSOP package.

For engineers reviewing the TPS3307-33DGNR datasheet, TPS3307-33DGNR pinout, TPS3307-33DGNR application, or TPS3307-33DGNR equivalent, key selection criteria include triple-threshold voltage supervision (4.55V/2.93V/1.25V), manual reset input compatibility, temperature-compensated reference accuracy, and MSOP-8 footprint suitability for space-constrained industrial and automotive control boards.

Technical Context

The TPS3307-33DGNR integrates three independent voltage comparators with precision thresholds (4.55V for SENSE1, 2.93V for SENSE2, 1.25V for SENSE3), each with 30–40mV hysteresis to prevent chatter during supply transients. Its internal oscillator-driven 200ms reset timer initiates only after all three sense inputs exceed their respective VIT+ thresholds.

It employs a temperature-compensated 1.25V bandgap reference to maintain threshold stability across –40°C to +85°C. The MR input supports asynchronous reset assertion, while dual RESET outputs (active-low and active-high) enable direct interfacing with diverse processor reset architectures without external logic inversion.

Key Specifications

Pinout & Package

HVSSOP-8 (DGN) package: 3mm × 3mm, 0.65mm pitch, exposed thermal pad, 1.1mm max height. Optimized for high-density PCB layouts and thermal performance in compact systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3307-33DR, the TPS3307-33DGNR offers 43% smaller footprint and superior thermal dissipation; compared with MAX6833HUT+T, it provides full triple-rail supervision and MR functionality essential for complex embedded systems.

Availability

TPS3307-33DGNR is available at Aetrix Electronics and suitable for industrial programmable controllers, automotive body electronics, portable medical instrumentation, and network edge infrastructure requiring stable component supply and long-term manufacturability.

Supply support for TPS3307-33DGNR 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 delivering analog and embedded processing solutions, with over 50 years of innovation in power management, signal chain, and microcontrollers.

The TPS3307 family was engineered specifically for robust, low-power supervision of multi-rail DSP and microprocessor systems in industrial and automotive applications where reliability and space efficiency are critical.

FAQ

What is the exact function of the SENSE3 pin on the TPS3307-33DGNR?

The SENSE3 pin on the TPS3307-33DGNR is an adjustable voltage monitoring input with a fixed 1.25V threshold (VIT+). It requires an external resistor divider to scale higher voltages down to 1.25V, enabling supervision of any supply rail above 1.25V-including 2.5V, 1.8V, or custom analog references-without changing the IC.

Does the TPS3307-33DGNR require an external capacitor for its 200ms reset delay?

No, the TPS3307-33DGNR does not require an external capacitor for its 200ms reset delay. The timing is generated by an internal oscillator and timer circuit, making the delay fixed and accurate across temperature and voltage-reducing bill-of-materials count and eliminating capacitor-related drift or aging effects.

Can the TPS3307-33DGNR monitor a 2.5V supply rail?

Yes, the TPS3307-33DGNR can monitor a 2.5V supply rail using the SENSE3 input. By configuring an external resistor divider to scale 2.5V down to 1.25V at the SENSE3 pin, the device detects undervoltage conditions with the same 1.25V threshold, preserving accuracy and hysteresis performance.

What is the minimum VDD voltage at which the TPS3307-33DGNR asserts RESET?

The TPS3307-33DGNR asserts RESET when VDD rises above 1.1V. This ensures early reset activation during power-up, even before all monitored supply rails reach regulation-providing fail-safe initialization for downstream processors that require defined reset states prior to full voltage stabilization.

How does the manual reset (MR) input interact with the automatic supervision logic in the TPS3307-33DGNR?

The MR input on the TPS3307-33DGNR overrides all automatic supervision logic: pulling MR low forces immediate assertion of both RESET outputs, regardless of SENSEn voltage levels. Release of MR initiates the 200ms timer only after all SENSEn inputs are confirmed above their VIT+ thresholds, ensuring deterministic reset sequencing.