Texas Instruments TPS3307-25DGNR

Overview

TPS3307-25DGNR from Texas Instruments is a triple-voltage supervisor IC designed for DSP, microcontroller, and microprocessor 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 and automotive ECUs where multi-rail power integrity is critical.

For engineers reviewing the TPS3307-25DGNR datasheet, TPS3307-25DGNR pinout, TPS3307-25DGNR application, or TPS3307-25DGNR equivalent, key selection criteria include SENSE1/SENSE2 threshold voltages (2.93V / 2.25V), manual reset (MR) timing compatibility, HVSSOP-8 thermal performance, and reset assertion behavior below VDD ≥1.1V.

Technical Context

The TPS3307-25DGNR integrates three independent voltage comparators with temperature-compensated 1.25V reference, each feeding into a shared reset logic block with internal 200ms timer. Its architecture ensures synchronized reset release only after all three monitored rails exceed their respective thresholds - 2.93V (SENSE1), 2.25V (SENSE2), and 1.25V (SENSE3) - with 30mV hysteresis on SENSE1 and SENSE2 inputs.

It supports manual reset via MR pin (active-low, TTL-compatible), provides both active-low and active-high RESET outputs with ±2mA drive capability, and maintains defined reset state down to VDD = 1.1V. The device is characterized across –40°C to +85°C and uses an internal oscillator-free timing scheme eliminating external capacitor dependency.

Key Specifications

Pinout & Package

HVSSOP-8 (DGN) package: 3mm × 3mm body, 0.65mm pitch, exposed thermal pad, 1.1mm max height. Optimized for high-density PCB layouts and improved thermal dissipation versus SOIC-8.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3307-25DR, the TPS3307-25DGNR offers 35% smaller footprint and superior thermal performance in automated SMT lines; compared with MAX6832ASD+T, it provides full triple-rail coverage and deterministic 200ms timing essential for complex processors - making it irreplaceable in multi-voltage DSP/microcontroller systems.

Availability

TPS3307-25DGNR is available at Aetrix Electronics and suitable for industrial programmable controls, automotive electronic control units, and wireless communication systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3307-25DGNR 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 heritage in high-reliability industrial and automotive IC design.

The TPS3307 family was engineered specifically for robust power-supply monitoring in DSP and microprocessor-based systems demanding simultaneous validation of multiple voltage domains - delivering integrated timing, low power, and wide-temperature operation in compact packages.

FAQ

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

The SENSE3 pin on the TPS3307-25DGNR is an adjustable voltage monitor input referenced to a precise 1.25V internal threshold. It allows supervision of any supply rail >1.25V using an external resistor divider - for example, configuring it to monitor a 5V rail by setting R1/R2 to achieve 1.25V at SENSE3 when the rail is nominal. This flexibility extends the TPS3307-25DGNR beyond fixed 3.3V/2.5V use cases.

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

No, the TPS3307-25DGNR does not require an external capacitor for its reset delay. It incorporates an internal oscillator-free timing circuit that guarantees a fixed 200ms (typical) delay from the moment all SENSE inputs exceed their thresholds until RESET deasserts. This eliminates timing drift due to capacitor tolerance, aging, or temperature effects - a key reliability advantage over RC-based supervisors.

Can the TPS3307-25DGNR monitor a 1.8V supply rail?

The TPS3307-25DGNR is not specified to monitor 1.8V directly on SENSE1 or SENSE2 - those inputs are factory-trimmed for 3.3V and 2.5V rails respectively (2.93V and 2.25V thresholds). However, SENSE3 can monitor 1.8V by configuring an external resistor divider to scale the 1.8V rail down to 1.25V at the pin. This preserves accuracy while enabling adaptation to non-standard supply voltages.

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

The TPS3307-25DGNR asserts RESET when VDD rises above 1.1V (power-up reset voltage), ensuring early fault detection even during brownout conditions. This specification is guaranteed across the full –40°C to +85°C temperature range and enables reliable reset generation before other system components become operational - a critical feature for fail-safe embedded systems.

How does the MR pin interact with the automatic reset timing of the TPS3307-25DGNR?

The MR (manual reset) pin on the TPS3307-25DGNR provides asynchronous, priority override of the automatic supervision logic: pulling MR low immediately forces both RESET outputs active, regardless of SENSE input states or internal timer status. Release of MR initiates the full 200ms delay before RESET deassertion - ensuring clean, controlled recovery identical to power-on sequence.