Texas Instruments TPS3305-18DGNG4

Overview

TPS3305-18DGNG4 from Texas Instruments is a dual-voltage supervisor IC for DSP- and processor-based systems, monitoring 3.3 V (SENSE1) and 1.8 V (SENSE2) rails with factory-programmed 200 ms reset delay, watchdog timeout of 1.6 s typ, and supply current of 40 µA. It provides active-low and active-high RESET outputs and operates across –40°C to +85°C.

For engineers reviewing the TPS3305-18DGNG4 datasheet, TPS3305-18DGNG4 pinout, TPS3305-18DGNG4 application, or TPS3305-18DGNG4 equivalent, this page delivers verified specifications, terminal functions, dual-rail supervision context, watchdog timing behavior, and real-world use cases in portable, industrial, and automotive power sequencing.

Technical Context

The TPS3305-18DGNG4 implements two independent voltage-sense comparators with temperature-compensated 1.25 V reference, each with hysteresis (30 mV typ at 2.93 V threshold). Its internal oscillator drives both the power-on reset timer (200 ms) and watchdog timer (1.6 s), with asynchronous MR assertion and SENSEn-triggered reset propagation under 5 µs.

It features dual RESET outputs (active-low and active-high), manual reset input (MR), watchdog input (WDI), and two sense inputs (SENSE1/SENSE2) - all with defined logic thresholds (VIH = 0.7×VDD, VIL = 0.3×VDD) and fast transition response (50 ns/V on MR). The device asserts RESET when either SENSEn falls below its VIT– (1.68 V for SENSE2, 2.93 V for SENSE1) or WDI remains static beyond timeout.

Key Specifications

Pinout & Package

HVSSOP-8 (DGN) package: 3.0 mm × 3.0 mm, 0.65 mm pitch, 1.1 mm max height, exposed thermal pad (PowerPAD™) for enhanced thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3305-18D (larger SOIC) and MAX6816EUT+T (single-rail, no watchdog), the TPS3305-18DGNG4 uniquely integrates dual-rail supervision, watchdog timer, and HVSSOP thermal efficiency in one 3×3 mm package - making it optimal for compact, safety-critical, and battery-sensitive designs requiring coordinated power management.

Availability

TPS3305-18DGNG4 is available at Aetrix Electronics and suitable for industrial control, automotive infotainment, and portable medical instrumentation requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for TPS3305-18DGNG4 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 expertise in high-reliability supervisory circuits.

The TPS3305 family was designed specifically for DSP- and processor-based systems requiring dual-voltage monitoring, precise reset timing, and integrated watchdog functionality - targeting industrial, automotive, and portable electronics.

FAQ

What is the exact reset threshold voltage for SENSE2 on the TPS3305-18DGNG4?

The TPS3305-18DGNG4 has a nominal SENSE2 threshold of 1.68 V (VIT+) with a minimum of 1.64 V and maximum of 1.72 V at TA = 0°C to +85°C. At full temperature range (–40°C to +85°C), VIT– is specified from 1.64 V to 1.73 V. This threshold is factory-trimmed and temperature-compensated using an internal 1.25 V reference.

Does the TPS3305-18DGNG4 require external capacitors for reset timing?

No, the TPS3305-18DGNG4 does not require external capacitors for its 200 ms power-on reset delay or 1.6 s watchdog timeout - both timers are fully internal and factory-programmed. A 0.1 µF ceramic bypass capacitor on VDD is required for stable operation, but no timing capacitors are needed.

Can the TPS3305-18DGNG4 supervise voltages other than 3.3 V and 1.8 V?

The TPS3305-18DGNG4 is factory-configured to monitor 3.3 V (SENSE1) and 1.8 V (SENSE2) rails, with fixed thresholds of 2.93 V and 1.68 V respectively. It cannot be reconfigured for other voltages; alternative part numbers like TPS3305-25DGNG4 (3.3 V / 2.5 V) or TPS3305-33DGNG4 (5.0 V / 3.3 V) are available for different combinations.

What is the function of the two RESET pins on the TPS3305-18DGNG4?

The TPS3305-18DGNG4 provides both active-low RESET (Pin 5, open-drain) and active-high RESET (Pin 6, push-pull) outputs. This dual-output architecture allows direct interfacing with microcontrollers requiring either polarity, eliminates need for external inverters, and supports legacy and modern logic families simultaneously.

Is the TPS3305-18DGNG4 pin-compatible with other TPS3305 variants?

Yes, all TPS3305-xxDGNG4 variants (including TPS3305-18DGNG4, TPS3305-25DGNG4, and TPS3305-33DGNG4) share identical HVSSOP-8 (DGN) pinout, electrical characteristics, and timing behavior - only the SENSE1/SENSE2 threshold voltages differ. This enables drop-in replacement during design iteration or voltage scheme changes.