Texas Instruments TPS3307-25D

Overview

TPS3307-25D from Texas Instruments is a triple voltage supervisor IC designed for DSP and microprocessor-based systems requiring independent monitoring of 3.3V, 2.5V, and adjustable supply rails. It delivers fixed 200ms power-on reset delay, operates from 2V to 6V supply, draws ≤40µA quiescent current, and features dual active-low/high RESET outputs. It is deployed in industrial programmable controllers where reliable multi-rail power sequencing and brownout detection are critical.

For engineers reviewing the TPS3307-25D datasheet, TPS3307-25D pinout, TPS3307-25D application, or TPS3307-25D equivalent, this page provides verified functional specifications, SOIC-8 package details, real-world use cases in processor supervision, and validated alternative options for supply voltage monitoring in embedded systems with multiple rail dependencies.

Technical Context

The TPS3307-25D integrates three independent voltage comparators with temperature-compensated 1.25V reference, enabling precise threshold detection on SENSE1 (2.93V typ), SENSE2 (2.25V typ), and SENSE3 (1.25V typ). Its internal 200ms reset timer initiates only after all three inputs exceed their respective VIT+ thresholds, ensuring coordinated system initialization.

It supports manual reset via MR input with TTL-compatible logic levels, provides both active-low and active-high RESET outputs with defined behavior down to VDD ≥1.1V, and maintains hysteresis (20mV at 2.25V threshold) to prevent chatter during supply transitions - all within –40°C to +85°C operating range.

Key Specifications

Pinout & Package

TPS3307-25D is housed in an 8-pin SOIC (D) package with 1.27mm pitch, 3.9mm × 4.9mm body size, and 1.75mm maximum height per JEDEC MS-012AA. Pin 1 is located at the top-left corner adjacent to the index notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3307-25DGN, the TPS3307-25D offers drop-in compatibility with legacy SOIC footprints and simplified assembly, while TPS3823-25DBVR trades monitoring depth for lower unit cost and reduced complexity in dual-rail applications.

Availability

TPS3307-25D is available at Aetrix Electronics and suitable for industrial programmable controls, automotive electronic control units, and notebook/desktop computing systems requiring stable component supply and long-term production continuity.

Supply support for TPS3307-25D 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 90 years of innovation in industrial, automotive, and communications markets.

The TPS3307 family was engineered specifically for robust multi-rail power supervision in DSP and microprocessor systems - delivering coordinated reset timing, low-power operation, and precision voltage monitoring across harsh environmental conditions.

FAQ

What is the exact function of the SENSE3 pin on the TPS3307-25D?

The SENSE3 pin on the TPS3307-25D is an adjustable voltage monitor input referenced to an internal 1.25V precision bandgap. It allows supervision of any supply rail above 1.25V using an external resistor divider - for example, configuring it to monitor a 5V rail by setting the divider ratio to produce 1.25V at the pin when the rail reaches its nominal value. This flexibility makes the TPS3307-25D adaptable across diverse multi-rail architectures without redesigning the supervisor circuit.

Does the TPS3307-25D require an external capacitor for its reset delay function?

No, the TPS3307-25D does not require an external capacitor for its reset delay function. It incorporates an internal 200ms timer that activates automatically after all three SENSE inputs exceed their respective VIT+ thresholds. This eliminates the need for timing capacitors, reducing component count, PCB area, and potential drift-related inaccuracies associated with external RC networks - a key advantage over discrete or older-generation supervisors.

Can the TPS3307-25D operate reliably at VDD = 2.0V?

Yes, the TPS3307-25D is fully specified to operate at VDD = 2.0V across the full –40°C to +85°C temperature range. At this minimum supply, it maintains valid RESET assertion (VDD ≥1.1V), accurate SENSE threshold detection (2.93V/2.25V/1.25V), and functional MR input response. Its 40µA max supply current ensures minimal load on weak or battery-derived 2V sources, making the TPS3307-25D suitable for ultra-low-voltage industrial backup systems.

How does the TPS3307-25D handle simultaneous undervoltage on multiple rails?

The TPS3307-25D asserts RESET immediately upon detection of undervoltage on *any* monitored rail - whether SENSE1, SENSE2, or SENSE3 falls below its respective VIT– threshold. The RESET signal remains active until *all three* inputs rise above their VIT+ thresholds *and* the internal 200ms timer completes. This ensures deterministic recovery: no partial power-up is allowed, and system reset is extended until every rail is confirmed stable.

Is the TPS3307-25D pin-compatible with other members of the TPS3307 family?

Yes, the TPS3307-25D is fully pin-compatible with the TPS3307-18D and TPS3307-33D variants in the same SOIC-8 (D) package. All share identical pin assignments, electrical timing, and functional behavior - differing only in factory-trimmed SENSE1/SENSE2 thresholds (2.93V/2.25V for -25D vs. 2.93V/1.68V for -18D vs. 4.55V/2.93V for -33D). This enables direct substitution in existing layouts when adjusting monitored rail voltages without hardware changes.