Texas Instruments TPS3307-33DRG4

Overview

TPS3307-33DRG4 from Texas Instruments is a triple-voltage supervisor IC designed for DSP, microcontroller, and microprocessor systems requiring independent monitoring of 5V, 3.3V, and an adjustable supply (≥1.25V). It features fixed 200ms power-on reset delay, 40µA supply current, defined RESET assertion down to VDD ≥1.1V, and operates from –40°C to +85°C in SOIC-8 package.

For engineers reviewing the TPS3307-33DRG4 datasheet, TPS3307-33DRG4 pinout, TPS3307-33DRG4 application, or TPS3307-33DRG4 equivalent, key selection criteria include triple-threshold sensing (4.55V/2.93V/1.25V typ), dual active-reset outputs (RESET and RESET), manual reset input (MR), and compatibility with industrial, automotive, and portable processor-based systems.

Technical Context

The TPS3307-33DRG4 integrates three independent voltage comparators with temperature-compensated 1.25V reference, enabling precise supervision of nominal 5V (VIT+ = 4.55V), 3.3V (VIT+ = 2.93V), and user-defined supplies via external resistor dividers. Its internal 200ms reset timer initiates only after all SENSE inputs exceed their respective VIT+ thresholds.

Reset assertion occurs when any SENSE input falls below its VIT– threshold (e.g., 4.46V/2.86V/1.22V typ) or when MR is pulled low. The device provides both active-low and active-high RESET outputs with guaranteed logic states across VDD = 2V–6V, supporting robust system initialization in mixed-rail environments.

Key Specifications

Pinout & Package

TPS3307-33DRG4 is packaged in an 8-pin SOIC (D) package, 3.9mm × 4.9mm, 1.75mm max height, RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3307-33DGN and TPS3823-33DBVR, the TPS3307-33DRG4 uniquely delivers full triple-rail supervision in industry-standard SOIC-8 with manual reset and dual-output flexibility-making it optimal for complex multi-voltage systems where layout reuse and proven reliability are priorities.

Availability

TPS3307-33DRG4 is available at Aetrix Electronics and suitable for industrial programmable controllers, automotive infotainment systems, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3307-33DRG4 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 over 50 years of innovation in industrial, automotive, and communications markets.

The TPS3307 family was engineered specifically for processor-based systems needing simultaneous, independent supervision of multiple supply rails-addressing reliability gaps in DSP, MCU, and FPGA power sequencing.

FAQ

What is the exact function of the SENSE3 pin on the TPS3307-33DRG4?

The SENSE3 pin on the TPS3307-33DRG4 is an adjustable voltage monitor input referenced to an internal 1.25V precision bandgap. It accepts a divided-down version of any supply ≥1.25V via external resistors, triggering reset when the sensed voltage falls below 1.22V (VIT–) or rises above 1.28V (VIT+). This enables flexible supervision of non-standard rails like 1.8V, 2.5V, or 1.2V without changing the IC.

Does the TPS3307-33DRG4 require an external capacitor for its 200ms reset delay?

No, the TPS3307-33DRG4 does not require an external capacitor for its 200ms power-on reset delay. The timing is generated by an internal oscillator and timer circuit, eliminating the need for external components and reducing design complexity, PCB area, and potential failure points associated with capacitor aging or tolerance drift.

Can the TPS3307-33DRG4 be used to monitor a 12V supply?

Yes, the TPS3307-33DRG4 can monitor a 12V supply using the SENSE3 input with an appropriate resistor divider. Since SENSE3 is referenced to 1.25V, a 10:1 divider (e.g., 110kΩ top, 12.1kΩ bottom) scales 12V to 1.1V - but this falls below the 1.22V minimum VIT–. A 9.1:1 divider yields ~1.24V, within the valid 1.22–1.29V VIT– window. Ensure divider current remains <1µA to avoid loading error.

What is the maximum supply voltage the TPS3307-33DRG4 can tolerate on VDD?

The absolute maximum VDD rating for the TPS3307-33DRG4 is 7V, but continuous operation above 6V is not recommended. The recommended operating range is 2V to 6V. Exceeding 6V may cause parametric shift or accelerated degradation; TI specifies that operation at 7V must be limited to ≤1000 hours total to maintain reliability per the Absolute Maximum Ratings table.

How does the manual reset (MR) pin interact with the SENSE inputs on the TPS3307-33DRG4?

The MR pin on the TPS3307-33DRG4 is OR-ed with the SENSE comparators: asserting MR low forces both RESET outputs active regardless of SENSE voltage states. When MR returns high, the device resumes autonomous supervision - RESET deasserts only after all SENSE inputs exceed their VIT+ thresholds and the 200ms timer completes. This allows hardware-initiated resets independent of power-rail status.