Texas Instruments TPS3307-18DR

Overview

TPS3307-18DR from Texas Instruments is a triple-voltage supervisory IC for DSP/microcontroller systems, monitoring 3.3V, 1.8V, and adjustable supply rails with fixed 200ms reset delay, 40µA supply current, and operation from –40°C to +85°C in SOIC-8 package. It delivers reliable power-on reset and fault detection in battery-powered industrial controllers.

For engineers reviewing the TPS3307-18DR datasheet, TPS3307-18DR pinout, TPS3307-18DR application, or TPS3307-18DR equivalent, key selection criteria include triple-supply threshold accuracy (2.93V/1.68V/1.25V), active-low and active-high RESET outputs, manual reset (MR) support, and SOIC-8 tape-and-reel packaging for automated assembly.

Technical Context

The TPS3307-18DR integrates three independent voltage comparators with temperature-compensated 1.25V reference, enabling precise monitoring of 3.3V (SENSE1), 1.8V (SENSE2), and user-defined >1.25V (SENSE3) rails. Each input features hysteresis (30mV typical at 2.93V, 15mV at 1.68V) to prevent chatter during brownout recovery.

Its internal 200ms reset timer initiates only after all SENSE inputs exceed their respective VIT+ thresholds, ensuring synchronized system initialization. The MR input provides asynchronous reset assertion, while dual RESET outputs (active-low and active-high) support mixed-logic interface requirements without external inverters.

Key Specifications

Pinout & Package

TPS3307-18DR is housed in an 8-pin SOIC (D) package, 3.9mm × 4.9mm, 1.75mm max height, RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3307-18DGN, the TPS3307-18DR offers identical supervision performance in a standard SOIC-8 footprint optimized for legacy assembly lines; compared with MAX6816TPA+, it delivers full triple-rail coverage and dual-output flexibility at the cost of higher quiescent current-making it appropriate for complex multi-rail systems where reliability outweighs µA-level savings.

Availability

TPS3307-18DR is available at Aetrix Electronics and suitable for industrial programmable controls, automotive body electronics, and portable medical instrumentation requiring stable component supply and long-term manufacturability.

Supply support for TPS3307-18DR 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 TPS3307 family was designed specifically for robust power sequencing and fault detection in multi-rail DSP and microcontroller systems-emphasizing accuracy, low power, and integration over single-supply alternatives.

FAQ

What is the minimum VDD required for TPS3307-18DR to assert RESET?

The TPS3307-18DR defines RESET behavior when VDD ≥1.1V. Below this, RESET state is undefined. At VDD = 1.1V, the device guarantees RESET remains active (low on RESET pin, high on RESET pin) until all SENSE inputs exceed their VIT+ thresholds and the 200ms timer expires. This ensures fail-safe reset initiation even during marginal supply conditions. TPS3307-18DR meets this specification across its full –40°C to +85°C temperature range.

Can TPS3307-18DR monitor a 2.5V supply on SENSE2?

No-TPS3307-18DR is factory-configured for 3.3V/1.8V/adjustable supervision. Its SENSE2 input has a fixed 1.68V (typ) threshold optimized for 1.8V rails. To monitor 2.5V, use TPS3307-25DR instead, which provides a 2.25V (typ) SENSE2 threshold. Attempting to apply 2.5V to TPS3307-18DR's SENSE2 will cause premature reset assertion since 2.5V exceeds the 1.72V (max) VIT+ limit. TPS3307-18DR must be used strictly within its designated voltage monitoring map.

Does TPS3307-18DR require external components for basic operation?

TPS3307-18DR requires no external timing components-the 200ms reset delay is fully internal. However, a 0.1µF ceramic bypass capacitor is mandatory between VDD and GND, placed adjacent to the pins, to stabilize the internal reference and prevent false resets. For SENSE3, an external resistor divider is required to scale any supply >1.25V down to the 1.25V reference. TPS3307-18DR's RESET (pin 5) also requires an external pull-up resistor for proper open-drain operation.

What is the function of the dual RESET outputs on TPS3307-18DR?

TPS3307-18DR provides two independent reset signals: pin 5 (RESET) is active-low, open-drain, requiring an external pull-up; pin 6 (RESET) is active-high, push-pull, driving rail-to-rail. This allows simultaneous interfacing with legacy microcontrollers expecting active-low reset and modern peripherals requiring active-high assertion-eliminating external inverters or logic gates. Both outputs transition synchronously, ensuring consistent reset timing across mixed-signal subsystems. TPS3307-18DR maintains this dual-output capability across all operating conditions.

Is TPS3307-18DR compatible with lead-free reflow processes?

Yes-TPS3307-18DR carries RoHS-compliant NiPdAu lead finish and is rated MSL Level-1 (unlimited floor life), qualified for peak reflow temperatures up to 260°C per JEDEC J-STD-020. Its SOIC-8 package withstands standard lead-free solder profiles without delamination or parametric shift. Texas Instruments specifies no special pre-bake requirements, and TPS3307-18DR has been validated in production environments using convection and vapor-phase reflow. Always follow TI's recommended landing pattern and stencil design for optimal solder joint reliability.