Texas Instruments TPS3307-18DRG4

Overview

TPS3307-18DRG4 from Texas Instruments is a triple-voltage supervisor IC designed for DSP, microcontroller, and microprocessor power sequencing and reset management. It monitors three independent supply rails-3.3V, 1.8V, and an adjustable voltage ≥1.25V-with fixed 200ms reset delay, 40µA supply current, and operation from –40°C to +85°C in SOIC-8 package. It enables robust system initialization in portable and industrial embedded systems.

For engineers reviewing the TPS3307-18DRG4 datasheet, TPS3307-18DRG4 pinout, TPS3307-18DRG4 application, or TPS3307-18DRG4 equivalent, key selection criteria include triple-supply monitoring thresholds (2.93V/1.68V/1.25V), active-low and active-high RESET outputs, manual reset (MR) support, micropower consumption, and SOIC-8 thermal performance under 2V–6V VDD.

Technical Context

The TPS3307-18DRG4 implements three independent comparator channels with temperature-compensated 1.25V reference, each feeding into a shared reset logic block with 200ms internal timer. Its dual RESET outputs (active-low and active-high) allow direct interface with both legacy and modern processor reset inputs without external inversion.

It features defined reset assertion down to VDD ≥1.1V, hysteresis per sense input (30mV typical at 1.68V threshold), and MR input compatible with 0.3×VDD/0.7×VDD logic levels. The device operates across full 2V–6V supply range while maintaining stable threshold accuracy over –40°C to +85°C.

Key Specifications

Pinout & Package

TPS3307-18DRG4 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-supply supervision applications.

Compared with TPS3307-18DGNR, TPS3307-18DRG4 offers proven SOIC manufacturability and higher thermal margin in standard reflow profiles; versus TPS3808G33DBVR, it delivers essential triple-rail coordination at the cost of higher quiescent current-critical for complex embedded platforms.

Availability

TPS3307-18DRG4 is available at Aetrix Electronics and suitable for industrial programmable controllers, automotive body electronics, portable medical diagnostics, and data acquisition systems requiring stable component supply, long-lifecycle support, and TI-qualified industrial-grade performance.

Supply support for TPS3307-18DRG4 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 high-reliability silicon solutions for industrial, automotive, and communications markets.

The TPS3307 family was engineered to solve multi-rail reset coordination challenges in DSP and microprocessor-based systems, delivering integrated triple supervision with minimal external components and guaranteed timing behavior.

FAQ

What is the function of the two RESET pins on the TPS3307-18DRG4?

The TPS3307-18DRG4 provides dual reset outputs: pin 5 is an active-low open-drain RESET signal requiring an external pull-up resistor, while pin 6 is an active-high push-pull RESET output. This allows direct interface with processors that accept either polarity without additional logic, and supports redundant reset paths in safety-critical designs. Both outputs assert simultaneously when any monitored supply falls below its threshold or when MR is pulled low.

Can the TPS3307-18DRG4 monitor a 2.5V supply on SENSE2?

No-the TPS3307-18DRG4 is factory-configured for 3.3V/1.8V/adjustable monitoring. Its SENSE2 threshold is fixed at 1.68V (typ), optimized for 1.8V rails. To supervise a 2.5V supply, use SENSE3 with an external resistor divider to scale the input down to ≤1.25V, referencing the internal 1.25V bandgap. The TPS3307-25DRG4 variant is specifically calibrated for 3.3V/2.5V monitoring.

Does the TPS3307-18DRG4 require an external capacitor for reset timing?

No. The TPS3307-18DRG4 integrates a precision 200ms reset delay timer, eliminating the need for external timing capacitors. This improves reliability by removing capacitor aging, leakage, and temperature drift variables from the reset timing path-critical for long-life industrial deployments where maintenance is impractical.

What is the minimum VDD required for the TPS3307-18DRG4 to assert RESET?

The TPS3307-18DRG4 asserts RESET when VDD rises to ≥1.1V (power-up reset voltage). This ensures early reset activation during power ramp-up, preventing processor execution before core supplies reach functional levels. The device remains operational and continues monitoring all SENSE inputs across the full 2V–6V VDD range.

Is the TPS3307-18DRG4 RoHS compliant and what is its moisture sensitivity level?

Yes, the TPS3307-18DRG4 is RoHS compliant with NiPdAu lead finish and carries an MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH), meaning it can be stored indefinitely without dry-pack requirements. This simplifies inventory management and eliminates bake-out steps prior to assembly, reducing manufacturing overhead.