Texas Instruments TPS3307-25DR

Overview

TPS3307-25DR 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 used in industrial programmable controllers and automotive ECUs where reliable multi-rail power sequencing is critical.

For engineers reviewing the TPS3307-25DR datasheet, TPS3307-25DR pinout, TPS3307-25DR application, or TPS3307-25DR equivalent, key selection criteria include SENSE1/SENSE2 threshold voltages (2.93V/2.25V), manual reset (MR) timing behavior, SOIC-8 package compatibility, and guaranteed RESET assertion down to VDD ≥1.1V - all essential for robust system initialization in battery-powered and embedded control designs.

Technical Context

The TPS3307-25DR implements three independent voltage comparators with temperature-compensated 1.25V internal reference, enabling precise monitoring of nominal 3.3V (SENSE1), 2.5V (SENSE2), and user-defined >1.25V (SENSE3) supplies. Each input includes hysteresis (20–40mV depending on threshold) to prevent noise-induced false resets.

Its internal 200ms reset timer initiates only after all three SENSE inputs exceed their respective VIT+ thresholds; RESET remains asserted if any SENSE drops below VIT−. The MR input provides asynchronous reset override, while dual complementary RESET outputs support both active-low and active-high logic interface requirements without external inversion.

Key Specifications

Pinout & Package

TPS3307-25DR is packaged in an 8-pin SOIC (D) package, 3.9mm × 4.9mm body, 1.75mm max height, with standard 1.27mm pitch and RoHS-compliant NiPdAu lead finish. Pin 1 is located at the top-left corner with a molded index notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3307-25DGN, the TPS3307-25DR offers identical functionality in a larger but more manufacturable SOIC package with broader reflow compatibility; versus MAX6816EPA+, it provides full triple-rail supervision, longer reset timing, and lower power - making it the only direct functional alternative for modern multi-supply embedded systems.

Availability

TPS3307-25DR is available at Aetrix Electronics and suitable for industrial programmable controls, automotive electronic control units, and portable medical instrumentation requiring stable component supply across extended product lifecycles.

Supply support for TPS3307-25DR 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 decades of experience in high-reliability industrial and automotive ICs.

The TPS3307 family was engineered specifically for DSP and microprocessor-based systems demanding simultaneous multi-rail power supervision - addressing the need for deterministic reset sequencing in complex embedded platforms.

FAQ

What is the exact SENSE1 and SENSE2 threshold voltage for TPS3307-25DR?

The TPS3307-25DR has a typical SENSE1 threshold (VIT+) of 2.93V and SENSE2 threshold (VIT+) of 2.25V, with ±3% variation over temperature and supply voltage. These values are factory-trimmed and specified in the Electrical Characteristics table of the SLVS199C datasheet. The TPS3307-25DR uses these fixed thresholds to monitor standard 3.3V and 2.5V rails without external resistor networks.

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

No, the TPS3307-25DR integrates a precision 200ms reset timer that requires no external capacitor. This internal timing circuit eliminates component count and layout sensitivity associated with RC-based delays. The TPS3307-25DR guarantees this delay starts only after all three SENSE inputs exceed their VIT+ thresholds, ensuring synchronized system initialization.

Can TPS3307-25DR monitor a 5V supply rail?

Yes - the TPS3307-25DR's SENSE3 input is adjustable and can monitor any supply >1.25V using an external resistor divider referenced to its internal 1.25V bandgap. For a 5V rail, a standard 2.87kΩ/1kΩ divider yields ~1.25V at SENSE3, enabling accurate detection. The TPS3307-25DR does not natively monitor 5V on SENSE1 or SENSE2, which are fixed at 2.93V and 2.25V respectively.

What is the minimum VDD required for TPS3307-25DR to assert RESET?

The TPS3307-25DR asserts RESET when VDD rises to ≥1.1V, as specified in the "Power-up reset voltage" parameter. This ensures early reset assertion during power ramp-up, even before the monitored SENSE rails reach their thresholds. The TPS3307-25DR maintains valid RESET output down to this level, supporting robust brownout detection in low-voltage systems.

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

Yes - all TPS3307-x variants (including TPS3307-18DR, TPS3307-25DR, and TPS3307-33DR) share identical SOIC-8 pinout, electrical interface, and timing behavior. Only the SENSE1/SENSE2 threshold voltages differ between part numbers. The TPS3307-25DR can be substituted in designs originally using TPS3307-18DR or TPS3307-33DR with no PCB changes, provided the monitored rail voltages match its 2.93V/2.25V thresholds.