Texas Instruments TPS3307-33DGNRG4

Overview

TPS3307-33DGNRG4 from Texas Instruments is a triple-voltage supervisor IC designed for DSP, microcontroller, and microprocessor power sequencing and reset management. It monitors three independent supply rails-5V (SENSE1), 3.3V (SENSE2), and an adjustable voltage ≥1.25V (SENSE3)-with fixed 200ms reset delay, 40µA supply current, and operation from –40°C to +85°C in an 8-pin HVSSOP package. It enables reliable system initialization in industrial and automotive embedded controllers.

For engineers reviewing the TPS3307-33DGNRG4 datasheet, TPS3307-33DGNRG4 pinout, TPS3307-33DGNRG4 application, or TPS3307-33DGNRG4 equivalent, key selection considerations include triple-supply monitoring thresholds (4.55V/2.93V/1.25V), dual active-reset outputs (RESET and RESET), manual reset input (MR), and compatibility with TI's MSP430C325-based designs requiring robust power-on reset behavior.

Technical Context

The TPS3307-33DGNRG4 implements a temperature-compensated bandgap reference and precision comparator architecture to independently monitor SENSE1 (5V rail), SENSE2 (3.3V rail), and SENSE3 (user-adjustable rail). Each input features hysteresis (30–40mV) and defined threshold accuracy (±1.5% typical) across –40°C to +85°C.

Its internal 200ms power-on reset timer initiates after all monitored voltages exceed their respective VIT+ thresholds and requires no external capacitor. The MR input provides asynchronous reset assertion, while dual complementary reset outputs (active-low RESET and active-high RESET) support diverse logic interface requirements without external inverters.

Key Specifications

Pinout & Package

HVSSOP-8 (DGN) package: 3mm × 3mm, 0.65mm pitch, 1.1mm max height, exposed thermal pad (PowerPAD™), RoHS-compliant NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3307-33DGNRG4, the SOIC variant offers identical electrical performance but larger footprint and inferior thermal dissipation, while the TPS386000RGTT trades triple monitoring for watchdog capability - making it unsuitable as a drop-in replacement but viable for simplified single-rail use cases.

Availability

TPS3307-33DGNRG4 is available at Aetrix Electronics and suitable for industrial programmable controls, automotive body electronics, and notebook power management requiring stable component supply and long-term production continuity.

Supply support for TPS3307-33DGNRG4 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 automotive and industrial qualification expertise.

The TPS3307 family was engineered specifically for processor-based systems needing simultaneous multi-rail power supervision and deterministic reset timing - targeting DSP, MCU, and microprocessor applications in harsh environments.

FAQ

What is the function of the dual RESET outputs on the TPS3307-33DGNRG4?

The TPS3307-33DGNRG4 provides both an active-low open-drain RESET output (pin 5) and an active-high push-pull RESET output (pin 6). This dual-output architecture allows direct interfacing with MCUs or FPGAs that require either polarity without external logic inversion. The active-low output must be pulled up externally, while the active-high output drives high/low directly. Both outputs assert simultaneously during power-on, brownout, or MR activation, ensuring consistent reset signaling across mixed-logic systems.

How does the TPS3307-33DGNRG4 determine its reset timeout period?

The TPS3307-33DGNRG4 uses an internal precision timer that initiates a fixed 200ms (typical) delay after all three SENSE inputs rise above their respective VIT+ thresholds. This timer is fully integrated - no external capacitor or resistor is needed. The delay ensures stable power-up before releasing the reset signal, preventing premature CPU execution. Timing is guaranteed across –40°C to +85°C and independent of VDD within 2V–6V.

Can the TPS3307-33DGNRG4 monitor a 2.5V supply rail?

No - the TPS3307-33DGNRG4 is factory-configured to supervise 5V (SENSE1), 3.3V (SENSE2), and an adjustable rail ≥1.25V (SENSE3). Its SENSE1 and SENSE2 thresholds are fixed at 4.55V and 2.93V respectively; it does not support 2.5V monitoring natively. For 2.5V supervision, the TPS3307-25DGNRG4 variant (with 2.25V SENSE2 threshold) is the correct part number. Using the -33 variant for 2.5V would result in incorrect reset assertion.

What is the purpose of the exposed thermal pad on the TPS3307-33DGNRG4 HVSSOP package?

The exposed thermal pad (PowerPAD™) on the TPS3307-33DGNRG4's HVSSOP-8 package serves as the primary thermal conduction path to the PCB. When soldered to a thermally enhanced copper pour, it significantly lowers junction-to-board thermal resistance (θ_JB), improving power dissipation capability and long-term reliability. TI recommends connecting the pad to GND for both thermal and electrical stability, using multiple vias to inner ground planes per the layout guidelines in the datasheet.

Does the TPS3307-33DGNRG4 require external components for basic operation?

Yes - minimal external components are required: a 0.1µF ceramic bypass capacitor between VDD and GND (placed close to pins 8 and 4), and a pull-up resistor on the active-low RESET output (pin 5). The SENSE3 input requires an external resistor divider to scale higher voltages down to the 1.25V reference. No timing capacitor is needed for the 200ms reset delay, and no level-shifting components are required due to the dual-reset outputs.