Texas Instruments TPS7333QP

Overview

TPS7333QP from Texas Instruments is a 3.3-V fixed-output micropower low-dropout (LDO) voltage regulator with integrated delayed reset function. It delivers up to 500 mA output current, features 3.23 V to 3.37 V output tolerance over full load/line/temperature range, 44 mV typical dropout at 100 mA, and 200-ms active-low reset pulse width. It is used in microprocessor-based systems requiring reliable power-on reset and stable 3.3-V supply for DSPs, FPGAs, and embedded controllers.

For engineers reviewing the TPS7333QP datasheet, TPS7333QP pinout, TPS7333QP application, or TPS7333QP equivalent, key selection criteria include its 3.3-V fixed output, integrated 200-ms reset delay, PMOS pass element enabling ultra-low quiescent current (340 µA typ), and compatibility with 8-pin SOIC (P) packaging for industrial-grade thermal performance and board-level reliability.

Technical Context

The TPS7333QP employs a PMOS pass transistor architecture-replacing conventional PNP elements-to achieve sub-50-mV dropout and load-independent quiescent current. Its internal precision supervisor monitors the regulated 3.3-V output and triggers an open-drain RESET signal when VO falls below 2.868 V (min), with 18-mV hysteresis.

Reset timing is governed by an on-chip RC network yielding a nominal 200-ms timeout after undervoltage recovery; the EN pin supports logic-controlled shutdown, reducing sleep-state current to ≤0.5 µA. The SENSE pin (tied to OUT in standard configuration) enables remote sensing for improved load regulation accuracy.

Key Specifications

Pinout & Package

TPS7333QP is housed in an 8-pin plastic DIP (SOIC-8, package code P), with 1.27-mm pitch, 5.3-mm width, and JEDEC MS-012AC footprint. Thermal resistance θ_JA = 106°C/W enables robust thermal management in compact layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7333QD, the TPS7333QP offers superior thermal performance in the same SOIC-8 form factor, while TPS76333 trades off efficiency and accuracy for simplified architecture and broader legacy support - making TPS7333QP optimal for thermally demanding, battery-powered, or high-reliability 3.3-V systems.

Availability

TPS7333QP is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical patient monitor interfaces requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TPS7333QP 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 ICs, with decades of automotive and industrial qualification expertise.

The TPS73xx family was designed specifically for microprocessor-based systems needing tightly regulated voltage plus deterministic power-on reset - combining LDO regulation and supervisor functions in a single monolithic device to reduce system complexity and improve reliability.

FAQ

What is the minimum input voltage required for stable operation of the TPS7333QP?

The minimum input voltage for TPS7333QP is 3.77 V under maximum load (500 mA), calculated as VO(max) + VDO(max) = 3.37 V + 300 mV. At lighter loads, VI can be reduced - e.g., 3.23 V + 44 mV = 3.274 V suffices for 100 mA. This value is specified in the recommended operating conditions table and reflects worst-case dropout at full temperature range.

How does the SENSE pin function in the TPS7333QP, and when should it be used separately from OUT?

The SENSE pin in TPS7333QP monitors the regulated output voltage at the load rather than at the IC's OUT pin. In standard use, SENSE is shorted to OUT near the device to simplify layout. For high-precision applications with long PCB traces between regulator and load, SENSE should be routed directly to the load point to compensate for IR drop - improving output regulation accuracy to within ±0.5% under varying load currents.

What is the guaranteed reset timeout duration for the TPS7333QP across temperature and process variation?

The TPS7333QP guarantees a RESET timeout of 100 ms to 300 ms over –40°C to +125°C junction temperature, with 140–260 ms typical at 25°C. This specification is validated per the switching characteristics table and accounts for manufacturing spread and thermal drift - ensuring reliable reset hold time even in extreme environments like automotive under-hood applications.

Can the TPS7333QP be used in battery-powered applications with strict quiescent current requirements?

Yes - the TPS7333QP draws only 340 µA typical in active mode and ≤0.5 µA in shutdown (EN = VI), both specified over full temperature range. Its load-independent IQ enables accurate battery life prediction in portable instruments and wireless sensors, and its 200-ms reset timeout avoids unnecessary power cycles during brief input dips, preserving energy.

What package variants are available for the TPS7333QP, and how do they differ thermally?

TPS7333QP is exclusively offered in the 8-pin plastic DIP (SOIC-8, package code P) with θ_JA = 106°C/W. Other variants include TPS7333QD (SOIC-8, θ_JA = 172°C/W) and TPS7333QPW (TSSOP-20, θ_JA = 178°C/W). The P package provides the best thermal performance among SOIC options due to larger copper exposure and lower junction-to-ambient resistance - critical for sustained 500-mA operation.