Texas Instruments TPS3306-15DG4

Overview

TPS3306-15DG4 from Texas Instruments is a dual-voltage supervisory IC designed for DSP and processor-based 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 operates across –40°C to +85°C in VSSOP-8 package.

For engineers reviewing the TPS3306-15DG4 datasheet, TPS3306-15DG4 pinout, TPS3306-15DG4 application, or TPS3306-15DG4 equivalent, key selection criteria include dual-threshold voltage supervision (2.93 V / 1.40 V), ultra-low supply current (15 µA typ), defined RESET assertion down to VDD ≥ 1.1 V, and compatibility with battery-powered and automotive embedded systems.

Technical Context

The TPS3306-15DG4 implements two independent voltage comparators with fixed thresholds (2.93 V for SENSE1, 1.40 V for SENSE2) and internal hysteresis (typ. 15 mV). Its RESET logic asserts low when either SENSE input falls below its threshold or during power-up until VDD ≥ 1.1 V and both SENSE inputs exceed thresholds for ≥100 ms.

A dedicated PFI comparator referenced to 1.25 V enables external power-fail detection via resistor divider, while the WDI input supports edge-triggered watchdog reset with 0.8 s timeout. The device uses open-drain outputs (RESET, PFO) compatible with 3.3 V and 5 V logic families and tolerates VDD from 2.7 V to 6 V.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3306-15DG4, the DR variant trades compactness for mechanical robustness and thermal margin, while DGKR offers identical performance in optimized packaging for SMT scalability-neither is pin-compatible with non-DGK/D variants due to differing footprint dimensions.

Availability

TPS3306-15DG4 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive ADAS modules, and portable medical devices requiring stable component supply, guaranteed long-term availability, and full traceability.

Supply support for TPS3306-15DG4 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 with emphasis on reliability, precision, and energy efficiency.

The TPS3306 family was engineered specifically for dual-rail DSP and microprocessor systems needing coordinated voltage supervision, watchdog safety, and power-fail signaling in space-constrained industrial and automotive applications.

FAQ

What is the exact SENSE1 and SENSE2 threshold voltage for TPS3306-15DG4?

The TPS3306-15DG4 has a typical SENSE1 threshold of 2.93 V and a typical SENSE2 threshold of 1.40 V, with ±3% variation over temperature and supply. These values are factory-trimmed and specified in Table 1 of the SLVS290C datasheet. The thresholds are fixed per part number and not adjustable - TPS3306-15DG4 is specifically calibrated for 3.3 V / 1.5 V rail monitoring.

Does TPS3306-15DG4 require external components to function as a basic supervisor?

No, the TPS3306-15DG4 operates autonomously with only VDD, GND, and the two SENSE inputs connected. External pull-up resistors on RESET and PFO are required for proper open-drain logic interfacing, but no timing capacitors or resistors are needed - the 100 ms reset delay and 0.8 s watchdog timeout are fully integrated. WDI may be left floating to disable the watchdog.

Can TPS3306-15DG4 monitor voltages other than 3.3 V and 1.5 V?

Yes - while SENSE1 and SENSE2 are fixed at 2.93 V and 1.40 V respectively, the PFI input accepts an externally scaled voltage using a resistor divider. With a 1.25 V internal reference and 10 mV hysteresis, PFI can supervise any voltage >1.25 V (e.g., 12 V battery via 10:1 divider). The TPS3306-15DG4 datasheet provides design equations and tolerance guidance for PFI networks.

What is the minimum VDD required for TPS3306-15DG4 to assert RESET?

The TPS3306-15DG4 asserts RESET whenever VDD rises above 1.1 V, regardless of SENSE input states. This "power-up reset" feature ensures early fault detection during brownout conditions. Full functionality (including SENSE comparison and watchdog) requires VDD ≥ 2.7 V per recommended operating conditions, but RESET remains active and valid down to 1.1 V.

Is TPS3306-15DG4 RoHS compliant and what is its moisture sensitivity level?

Yes, TPS3306-15DG4 is RoHS compliant (lead-free, NiPdAu finish) and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH) per JEDEC J-STD-020. The VSSOP-8 (DGK) package uses NIPDAU lead finish and is qualified for peak reflow of 260°C. Full compliance documentation is available in TI's Package Option Addendum for orderable part TPS3306-15DGK.