Texas Instruments TPS7A6333QPWPRQ1

Overview

TPS7A6333QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade 3.3-V fixed-output LDO regulator with integrated watchdog timer, power-on reset, and fault reporting. It delivers up to 300 mA output current, maintains regulation down to 7-V input (with 45-V transient tolerance), and draws only 35 µA quiescent current at light load-enabling always-on operation in automotive body control modules and infotainment power rails.

For engineers reviewing the TPS7A6333QPWPRQ1 datasheet, TPS7A6333QPWPRQ1 pinout, TPS7A6333QPWPRQ1 application, or TPS7A6333QPWPRQ1 equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal and protection behavior, and real-world selection guidance for safety-critical 12-V/24-V vehicle systems.

Technical Context

The TPS7A6333QPWPRQ1 integrates a low-dropout pass transistor with ultra-low IQ biasing, a programmable window watchdog (set via ROSC resistor), and a voltage supervisor with open-drain nRST output. Its internal charge pump enables stable operation across wide VIN (7–40 V) while maintaining <300 mV dropout at 150 mA.

It implements dual-stage protection: overcurrent shutdown with 350–1000 mA trip threshold, and thermal shutdown at 165°C with 10°C hysteresis. The reset delay is programmable via CDLY capacitor on RDELAY pin (300 µs to 300 ms), and power-on-reset threshold is fixed at 93% of VOUT (3.07 V for 3.3-V output).

Key Specifications

Pinout & Package

TPS7A6333QPWPRQ1 uses the thermally enhanced 14-pin HTSSOP-PWP package (5.00 mm × 4.40 mm) with PowerPAD for PCB-level heat dissipation. Pin 0 (exposed thermal pad) must be soldered to a large copper pour for R_θJB = 27.4°C/W performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO-with-watchdog applications.

Compared with TPS7B6733QPWPRQ1 and TLV73333PDPWR, the TPS7A6333QPWPRQ1 uniquely combines AEC-Q100 Grade 1 qualification, integrated watchdog with fault flag, programmable reset delay, and 35-µA IQ-making it the only drop-in solution for ASIL-B-compliant automotive power domains requiring autonomous fault detection.

Availability

TPS7A6333QPWPRQ1 is available at Aetrix Electronics and suitable for automotive head units, ADAS camera modules, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS7A6333QPWPRQ1 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 and embedded processing technologies, with decades of automotive qualification expertise and broad AEC-Q100 product coverage.

The TPS7A63-Q1 product line targets automotive power management in safety-critical domains, delivering integrated supervision (watchdog, reset, fault reporting) alongside ultra-low-IQ LDO regulation for ASIL-B system compliance.

FAQ

What is the maximum input voltage rating for TPS7A6333QPWPRQ1, and does it survive automotive load dump?

TPS7A6333QPWPRQ1 has an absolute maximum input voltage rating of 45 V for durations under 480 ms, per its Absolute Maximum Ratings table. This exceeds ISO 7637-2 Pulse 5a (load dump) requirements (typically 40 V for 400 ms), allowing direct connection to 12-V/24-V battery rails without external TVS protection in most automotive applications. The device remains functional during such transients if input stays ≤45 V.

How is the watchdog timeout period set on TPS7A6333QPWPRQ1, and what is its accuracy?

The watchdog timeout on TPS7A6333QPWPRQ1 is set by connecting an external resistor between ROSC (Pin 14) and GND. With ROSC = 10 kΩ ±1%, the window is 10 ms; with 20 kΩ ±1%, it is 20 ms. The datasheet specifies ±10% tolerance on the watchdog period excluding external resistor tolerance. So total accuracy depends on both ROSC resistor tolerance and the device's internal oscillator variation.

Does TPS7A6333QPWPRQ1 support programmable reset delay, and how is it implemented?

Yes, TPS7A6333QPWPRQ1 supports programmable reset delay via an external capacitor (CDLY) connected between RDELAY (Pin 6) and GND. The internal current source (0.75–1.25 µA) charges CDLY to a threshold voltage, setting delay from 300 µs (100 pF) to 300 ms (100 nF). An internal 250-µs default applies if CDLY is unconnected, simplifying designs where minimal delay suffices.

What is the thermal performance of TPS7A6333QPWPRQ1 in the HTSSOP package, and how should the PowerPAD be handled?

In the PWP (HTSSOP-14) package, TPS7A6333QPWPRQ1 has R_θJA = 46°C/W and R_θJB = 27.4°C/W. To achieve rated thermal performance, the exposed PowerPAD (Pin 0) must be soldered to a minimum 200-mm² copper pour connected to internal ground planes via ≥4 thermal vias. Failure to do so risks exceeding 150°C junction temperature under 300-mA load at 85°C ambient.

Is TPS7A6333QPWPRQ1 pin-compatible with other members of the TPS7A6x-Q1 family, such as TPS7A6350QPWPRQ1?

Yes, TPS7A6333QPWPRQ1 is pin-compatible with TPS7A6350QPWPRQ1 (5-V fixed version) and TPS7A6301QPWPRQ1 (adjustable version) in the same HTSSOP-PWP package. All share identical pinout, thermal pad layout, and peripheral connections (ROSC, RDELAY, WD, nWD_EN, etc.), enabling single PCB design reuse across 3.3-V, 5-V, and adjustable output variants.