Texas Instruments TPS3307-33DG4

Overview

TPS3307-33DG4 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 max supply current, 2V–6V operating range, and dual active-low/active-high RESET outputs in an SOIC-8 package.

For engineers reviewing the TPS3307-33DG4 datasheet, TPS3307-33DG4 pinout, TPS3307-33DG4 application, or TPS3307-33DG4 equivalent, key selection criteria include SENSE threshold voltages (4.55V/2.93V/1.25V), manual reset (MR) interface timing, RESET assertion behavior below VIT–, and compatibility with industrial, automotive, and portable equipment power sequencing requirements.

Technical Context

The TPS3307-33DG4 implements three independent voltage comparators with temperature-compensated 1.25V internal reference, enabling precise supervision of nominal 5V (SENSE1), 3.3V (SENSE2), and user-defined (SENSE3) supplies. Each SENSE input has hysteresis (40mV at 4.55V threshold) to prevent chatter during voltage transitions.

Reset logic combines power-up detection (RESET asserted until VDD ≥1.1V), monitored supply validation (RESET held low if any SENSEn < VIT–), and MR-triggered reset. An internal timer enforces 200ms (typ) delay before deasserting RESET after all SENSE inputs exceed VIT+, with propagation delays under 500ns for MR-to-RESET and 5µs for SENSE-to-RESET transitions.

Key Specifications

Pinout & Package

TPS3307-33DG4 is packaged in an 8-pin SOIC (D) package, 3.9mm × 4.9mm body, 1.75mm 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 triple-supervisor applications.

Compared with TPS3307-33DGN, the TPS3307-33DG4 offers identical supervision functionality in a larger SOIC-8 package ideal for prototyping and manual assembly, while MAX6812HEUS+T provides minimal single-rail oversight but cannot replace triple-monitoring or MR-driven reset coordination.

Availability

TPS3307-33DG4 is available at Aetrix Electronics and suitable for industrial programmable controls, automotive body electronics, and portable medical devices requiring stable component supply and long-term production continuity.

Supply support for TPS3307-33DG4 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 specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in industrial and automotive electronics.

The TPS3307 family was engineered specifically for multi-rail DSP and microprocessor systems needing coordinated power-on reset, brownout detection, and manual reset capability across three independent voltage domains.

FAQ

What is the exact SENSE1 threshold voltage for TPS3307-33DG4?

The TPS3307-33DG4 has a nominal SENSE1 threshold voltage (VIT+) of 4.55V at 25°C, with guaranteed min/max values of 4.46V and 4.64V over the full –40°C to +85°C operating temperature range. This threshold is factory-trimmed and temperature-compensated to ensure stability across environmental conditions, making it suitable for reliable 5V rail supervision without external calibration.

Does TPS3307-33DG4 require an external capacitor for its reset delay function?

No, the TPS3307-33DG4 does not require an external capacitor for its reset delay function. It integrates a precision internal timer that delivers a fixed 200ms (typical) delay from the moment all SENSE inputs exceed their respective VIT+ thresholds. This eliminates component count, reduces PCB area, and improves reliability compared to RC-based delay solutions.

How does the manual reset (MR) pin behave on TPS3307-33DG4?

The MR pin on TPS3307-33DG4 is an active-low input: pulling MR below 0.3×VDD (typically <1.0V at 3.3V supply) immediately forces both RESET outputs into their active states, regardless of SENSE input conditions. The minimum pulse width required is 100ns, and the pin exhibits low-leakage input current (–600µA max at VDD = 6V), ensuring compatibility with standard GPIO drivers.

Can TPS3307-33DG4 monitor a 2.5V supply rail?

Yes, TPS3307-33DG4 can monitor a 2.5V supply rail using the SENSE3 input with an external resistor divider. Since SENSE3's internal threshold is fixed at 1.25V, a 2:1 resistive divider (e.g., 100kΩ top, 100kΩ bottom) scales the 2.5V rail to 1.25V at the input, enabling accurate supervision. The device specifies ±25nA max input leakage at SENSE3, minimizing divider error.

What is the maximum supply voltage rating for TPS3307-33DG4?

The absolute maximum supply voltage (VDD) for TPS3307-33DG4 is 7V, but the recommended operating range is strictly 2V to 6V per TI's datasheet. Operation at 7V is limited to ≤1000 hours total lifetime and is not guaranteed for long-term reliability. For sustained operation, VDD must remain within 2V–6V to ensure specified performance, including RESET assertion at VDD ≥1.1V and full SENSE input accuracy.