Texas Instruments TPS3306-15DR

Overview

TPS3306-15DR from Texas Instruments is a dual-voltage supervisory IC designed for DSP and processor-based systems requiring independent monitoring of 3.3 V and 1.5 V rails. It provides power-on reset with 100 ms delay, watchdog timer (0.8 s timeout), open-drain RESET and PFO outputs, and operates from –40°C to +85°C in SOIC-8 package.

For engineers reviewing the TPS3306-15DR datasheet, TPS3306-15DR pinout, TPS3306-15DR application, or TPS3306-15DR equivalent, this page delivers verified specifications, validated pin functions, confirmed dual-supply supervision use cases, and real-world alternative part comparisons for embedded control, automotive, and battery-powered systems.

Technical Context

The TPS3306-15DR integrates two independent voltage comparators with fixed thresholds (2.93 V for SENSE1, 1.40 V for SENSE2), a dedicated power-fail comparator referenced to 1.25 V, and a retriggerable watchdog timer with 0.8 s timeout. Its RESET output asserts low when either sensed voltage falls below threshold or watchdog expires, and remains active until both SENSE inputs exceed thresholds for ≥100 ms.

It supports supply voltages from 2.7 V to 6 V, draws only 15 µA typical supply current, and features defined RESET behavior down to VDD ≥1.1 V. All outputs are open-drain, enabling wired-OR configurations and flexible pull-up voltage selection independent of VDD.

Key Specifications

Pinout & Package

TPS3306-15DR is housed in an 8-pin SOIC (D) package, 3.9 mm × 4.9 mm body, 1.75 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply supervisory applications.

Compared with TPS3306-15DGKR, the TPS3306-15DR offers identical supervision functionality in a larger, more manufacturable SOIC-8 package - ideal for prototyping and medium-volume production. Versus MAX6326-series, TPS3306-15DR uniquely integrates dual-rail monitoring and PFI in one device, reducing component count and interconnect complexity.

Availability

TPS3306-15DR is available at Aetrix Electronics and suitable for industrial automation, automotive infotainment, and portable medical devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS3306-15DR 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, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The TPS3306 family is engineered specifically for dual-rail supervision in DSP and processor-based systems - targeting applications where coordinated reset timing, low-power operation, and auxiliary voltage monitoring are critical.

FAQ

What is the exact reset threshold voltage for SENSE1 and SENSE2 on the TPS3306-15DR?

The TPS3306-15DR has factory-trimmed threshold voltages: SENSE1 triggers RESET when voltage falls below 2.93 V (typical), and SENSE2 triggers when voltage drops below 1.40 V (typical). These values are specified across –40°C to +85°C and are optimized for 3.3 V and 1.5 V nominal supplies respectively. The TPS3306-15DR datasheet confirms these thresholds in Table 1 and Electrical Characteristics section.

Does the TPS3306-15DR require external components to supervise standard 3.3 V and 1.5 V rails?

No, the TPS3306-15DR does not require external resistors to monitor 3.3 V and 1.5 V rails - its SENSE1 and SENSE2 inputs have internal precision thresholds (2.93 V and 1.40 V) matched to those nominal voltages. External components are only needed for PFI monitoring of non-standard voltages or for pull-up resistors on open-drain RESET and PFO outputs. This simplifies design and improves accuracy versus resistor-divider-based supervisors.

Can the watchdog timer on the TPS3306-15DR be disabled, and how?

Yes, the watchdog timer on the TPS3306-15DR can be disabled by leaving the WDI pin unconnected (floating) or tying it to a static logic level (VDD or GND). When WDI is inactive, the internal watchdog is disabled and will not assert RESET due to timeout. The TPS3306-15DR datasheet explicitly states that "leaving WDI unconnected disables the watchdog" - no configuration register or external signal is required.

What is the minimum VDD voltage at which the TPS3306-15DR guarantees RESET assertion?

The TPS3306-15DR guarantees RESET assertion when VDD rises above 1.1 V - this is the power-up reset voltage threshold specified in the Electrical Characteristics table. Below 1.1 V, RESET behavior is undefined; above it, RESET remains active until both SENSE1 and SENSE2 exceed their thresholds for ≥100 ms. This feature ensures reliable initialization even during severe brownout conditions, and is a documented specification for the TPS3306-15DR.

Is the TPS3306-15DR compatible with lead-free soldering processes?

Yes, the TPS3306-15DR is fully compatible with lead-free soldering processes. It carries RoHS-compliant NIPDAU lead finish and is rated MSL Level-1 with peak reflow temperature of 260°C (unlimited floor life). The Package Option Addendum confirms "Yes" for RoHS and "Level-1-260C-UNLIM" for moisture sensitivity - meaning the TPS3306-15DR can be processed using standard Pb-free reflow profiles without baking or special handling.