Texas Instruments TPS3306-25QDRG4Q1

Overview

TPS3306-25QDRG4Q1 from Texas Instruments is an automotive-grade dual supervisory circuit for DSP and processor-based systems, monitoring 3.3 V and 2.5 V supply rails with threshold voltages of 2.93 V and 2.25 V (typ), featuring a 100-ms power-on reset delay, 0.8-s watchdog time-out, and open-drain RESET/PFO outputs. It operates across −40°C to 125°C and draws only 15 µA typical supply current.

For engineers reviewing the TPS3306-25QDRG4Q1 datasheet, TPS3306-25QDRG4Q1 pinout, TPS3306-25QDRG4Q1 application, or TPS3306-25QDRG4Q1 equivalent, key selection considerations include dual-voltage supervision accuracy, watchdog timeout stability over temperature, automotive AEC-Q100 qualification, and SOIC-8 compatibility with legacy TPS3306-Q1 designs.

Technical Context

The TPS3306-25QDRG4Q1 integrates two independent voltage comparators with fixed thresholds (2.93 V on SENSE1, 2.25 V on SENSE2), a 100-ms reset delay timer, and a watchdog circuit triggered by WDI transitions. Its internal 1.25-V reference enables configurable PFI monitoring via external resistor dividers.

RESET asserts low when either SENSE1 or SENSE2 falls below its respective threshold, remains active until both inputs exceed thresholds for ≥100 ms, and is guaranteed functional down to VDD ≥ 1.1 V. The PFO output responds to PFI voltage crossing 1.25 V ±10 mV hysteresis, supporting low-battery or auxiliary supply fail detection.

Key Specifications

Pinout & Package

TPS3306-25QDRG4Q1 is housed in an 8-pin SOIC (D) package with 1.27-mm pitch, 3.9-mm body width, and 1.75-mm max height, compliant with JEDEC MS-012 AA and IPC-7351 land patterns.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3306-25QDRG4Q1, TPS3306-25QDRQ1 offers identical functionality with assured long-term availability, while TLV809E25DBVR reduces integration but sacrifices dual-rail supervision, watchdog, and automotive qualification - making it viable only for simplified, non-safety applications.

Availability

TPS3306-25QDRG4Q1 is available at Aetrix Electronics and suitable for automotive engine control, ADAS sensor fusion, infotainment head units, telematics gateways, and battery management systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TPS3306-25QDRG4Q1 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 company specializing in analog, embedded processing, and automotive ICs, with leadership in high-reliability power management and system monitoring solutions.

The TPS3306-Q1 product line delivers dual-voltage supervision with integrated watchdog and power-fail detection specifically for automotive DSP and microcontroller systems requiring AEC-Q100 compliance and robust startup sequencing.

FAQ

What is the exact voltage threshold monitored on SENSE2 for TPS3306-25QDRG4Q1?

The TPS3306-25QDRG4Q1 monitors SENSE2 at a nominal 2.5-V rail with a typical threshold voltage of 2.25 V, specified from 2.18 V (min) to 2.34 V (max) over −40°C to 125°C. This threshold is factory-trimmed and does not require external calibration. The TPS3306-25QDRG4Q1 maintains this accuracy using an internal bandgap reference and precision comparator architecture.

Does TPS3306-25QDRG4Q1 support watchdog functionality, and what is its timeout value?

Yes, the TPS3306-25QDRG4Q1 integrates a watchdog timer with a typical timeout of 0.8 s, adjustable between 0.5 s and 1.2 s over temperature and supply conditions. The timer resets on any rising or falling edge at WDI (Pin 7). Leaving WDI unconnected disables the watchdog. This feature is fully functional across the −40°C to 125°C range and is part of the AEC-Q100 qualification for TPS3306-25QDRG4Q1.

Can TPS3306-25QDRG4Q1 supervise voltages other than 3.3 V and 2.5 V?

Yes - while SENSE1 and SENSE2 are optimized for 3.3 V and 2.5 V rails respectively, the PFI input accepts any voltage above 1.25 V via an external resistor divider. For example, connecting PFI through R1/R2 (1% tolerance, ~1 MΩ total) allows monitoring of 5-V, 12-V, or battery voltages. The TPS3306-25QDRG4Q1 uses its internal 1.25-V reference to compare PFI, generating a PFO alert when the divided voltage falls below threshold.

What is the minimum VDD required for TPS3306-25QDRG4Q1 to assert RESET?

The TPS3306-25QDRG4Q1 guarantees RESET assertion when VDD rises above 1.1 V, enabling early fault detection during power ramp-up. Below 1.1 V, RESET behavior is undefined. This specification is verified across temperature and process corners and is documented in the "Power-up reset voltage" parameter of the TPS3306-25QDRG4Q1 datasheet with a typical value of 0.4 V and max of 1.44 V at IOL = 20 µA.

Is TPS3306-25QDRG4Q1 pin-compatible with other members of the TPS3306-Q1 family?

Yes - all TPS3306-Q1 variants (e.g., TPS3306-15QDRQ1, TPS3306-18QDRQ1, TPS3306-25QDRG4Q1, TPS3306-33QDRQ1) share identical SOIC-8 (D) pinout, terminal functions, and timing characteristics. Only the SENSE1/SENSE2 threshold voltages differ between variants. Therefore, TPS3306-25QDRG4Q1 can be substituted into existing layouts designed for other TPS3306-Q1 parts, provided the voltage supervision requirements match.