Texas Instruments TPS3306-15DGKG4

Overview

TPS3306-15DGKG4 from Texas Instruments is a dual-voltage supervisory IC designed for DSP and microprocessor systems requiring independent monitoring of 3.3 V and 1.5 V rails. It integrates power-on reset (100 ms delay), watchdog timer (0.8 s timeout), open-drain RESET and PFO outputs, and a dedicated power-fail comparator. It operates across –40°C to +85°C and draws only 15 µA typical supply current.

For engineers reviewing the TPS3306-15DGKG4 datasheet, TPS3306-15DGKG4 pinout, TPS3306-15DGKG4 application, or TPS3306-15DGKG4 equivalent, this page delivers verified specifications, package mapping, functional context, and real-world use cases for dual-rail power supervision in embedded control, automotive ECUs, and portable instrumentation.

Technical Context

The TPS3306-15DGKG4 implements two independent voltage comparators with fixed thresholds - 2.93 V (SENSE1) and 1.40 V (SENSE2) - enabling simultaneous supervision of 3.3 V and 1.5 V supplies. Its internal 100 ms reset delay timer activates after both SENSE inputs exceed their respective thresholds, ensuring stable system initialization.

A separate PFI comparator referenced to 1.25 V supports external resistor-divider-based power-fail detection on auxiliary rails, while the WDI input accepts edge-triggered watchdog resets (low-to-high or high-to-low transitions). Leaving WDI unconnected disables the watchdog function entirely.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 0.65 mm pitch, 1.1 mm max height, exposed thermal pad optional per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage supervisory applications.

Compared with TPS3306-15DGKR, the TPS3306-15DGKG4 offers identical supervision functionality but optimized for bench evaluation and small-batch integration; versus TPS3823-01DBVR, it adds essential dual-rail monitoring and PFI capability required for complex DSP architectures.

Availability

TPS3306-15DGKG4 is available at Aetrix Electronics and suitable for DSP power sequencing, automotive ECU supervision, and portable instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS3306-15DGKG4 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 IC design.

The TPS3306 family was engineered specifically for dual-rail DSP and processor systems needing coordinated reset, watchdog, and power-fail signaling - addressing timing-critical initialization in telecom infrastructure, motor control, and advanced driver-assistance systems.

FAQ

What is the exact reset threshold voltage for SENSE2 on the TPS3306-15DGKG4?

The TPS3306-15DGKG4 has a nominal SENSE2 threshold voltage of 1.40 V, with a guaranteed range of 1.37 V to 1.43 V over temperature and supply conditions. This threshold is factory-trimmed and applies specifically to the -15 variant, which is configured for 1.5 V rail supervision - distinct from other TPS3306-xx versions with different SENSE2 thresholds.

Does the TPS3306-15DGKG4 require external components to operate as a basic dual-supply supervisor?

No external components are required for basic dual-supply supervision with the TPS3306-15DGKG4. Pull-up resistors on RESET and PFO outputs are necessary for open-drain operation, but the internal voltage references, timers, and comparators are fully self-contained. External resistors on PFI are optional and only needed if using the power-fail comparator function.

Can the watchdog timer on the TPS3306-15DGKG4 be disabled, and how?

Yes, the watchdog timer on the TPS3306-15DGKG4 is disabled by leaving the WDI pin unconnected or tying it to a high-impedance state. The device does not require a pull-up or pull-down on WDI for disablement - floating WDI is the documented method per TI's SLVS290C datasheet, and no internal biasing is applied to this input.

What is the maximum supply voltage rating for the TPS3306-15DGKG4, and what happens above that limit?

The absolute maximum supply voltage (VDD) for the TPS3306-15DGKG4 is 7 V, but continuous operation above 6 V is not recommended. TI specifies that operation at 7 V must be limited to ≤1000 hours total to avoid reliability degradation. For sustained use, VDD must remain within the recommended 2.7 V to 6 V range to ensure parametric compliance and long-term stability.

Is the TPS3306-15DGKG4 pin-compatible with other TPS3306 variants like the TPS3306-33DGKG4?

No, the TPS3306-15DGKG4 is not pin-compatible with the TPS3306-33DGKG4 in terms of supervision function - though both share identical pinout and package (DGK), their internal threshold voltages differ fundamentally: TPS3306-15DGKG4 monitors 3.3 V/1.5 V rails (2.93 V / 1.40 V), while TPS3306-33DGKG4 monitors 5 V/3.3 V rails (4.55 V / 2.93 V). Swapping them without redesigning the power architecture will cause incorrect reset behavior.