Texas Instruments TPS7433DR

Overview

TPS7433DR from Texas Instruments is a 3.3-V, 200-mA low-dropout voltage regulator featuring PMOS pass transistor architecture, 170-mV dropout at 200 mA, ±3% output voltage tolerance over line/load/temperature, and fast transient response stable with 1-µF output capacitors. It serves as a precision post-regulator in power management subsystems for DSPs, FPGAs, and microcontrollers requiring clean, tightly regulated 3.3-V supply.

For engineers reviewing the TPS7433DR datasheet, TPS7433DR pinout, TPS7433DR application, or TPS7433DR equivalent, key selection criteria include dropout performance at full load, thermal shutdown behavior (150°C trip), enable-controlled standby current (<1 µA), and SOIC-8 compatibility with remote sense capability via SENSE pin.

Technical Context

The TPS7433DR uses a PMOS pass device enabling ultra-low dropout (170 mV typ. at 200 mA) and eliminating reverse-current diode requirements. Its internal error amplifier drives a high-impedance SENSE input, allowing remote sensing to compensate for PCB trace IR drop.

It integrates thermal shutdown (150°C trip, 130°C recovery), current limiting (~500 mA), and TTL-compatible enable logic. The regulator achieves 55 dB PSRR at 100 Hz and 190 µV_RMS output noise (300 Hz–50 kHz) with 1-µF ceramic output capacitor.

Key Specifications

Pinout & Package

TPS7433DR is housed in an 8-pin SOIC (D) package (JEDEC MS-012, AA variant), 3.91 mm × 4.90 mm footprint, 1.75 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout voltage regulator applications.

Compared with TPS7433DR, TPS76333DBVR trades remote sensing and low dropout for lower quiescent current, while MCP1700T-3302E/MB sacrifices dropout performance and thermal capability for ultra-low IQ and smaller footprint - TPS7433DR remains optimal for precision 3.3-V regulation with trace compensation in industrial and automotive environments.

Availability

TPS7433DR is available at Aetrix Electronics and suitable for industrial PLCs, FPGA configuration systems, medical sensor modules, and automotive body control units requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for TPS7433DR 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 expertise in high-reliability power solutions.

The TPS74xx family was designed for high-performance, low-noise local regulation in DSP, FPGA, and microcontroller applications where fast transient response and small-output-capacitor stability are essential.

FAQ

What is the minimum input voltage required for stable operation of the TPS7433DR?

The minimum input voltage for TPS7433DR is calculated as VO(max) + VDO(max). With 3.399 V maximum output (±3%) and 315 mV max dropout at 200 mA/–40°C to 125°C, VI(min) = 3.399 V + 0.315 V = 3.714 V. However, the datasheet specifies 4.3 V min for test conditions - design margin requires ≥4.4 V input for full-spec operation across temperature.

Can the TPS7433DR operate without an output capacitor?

No - the TPS7433DR requires a minimum 1-µF output capacitor with ≥300 mΩ ESR for loop stability. Operation without CO causes oscillation and regulation failure. Ceramic, tantalum, or aluminum electrolytic types are acceptable if ESR and capacitance meet specifications; zero-load operation is supported.

How does the SENSE pin improve regulation accuracy in the TPS7433DR?

The SENSE pin on the TPS7433DR provides high-impedance feedback directly from the load point, bypassing voltage drop across PCB traces between OUT and the powered device. This enables precise 3.3-V regulation at the load, correcting for up to ~100 mV of IR loss - critical for high-current or long-trace applications.

What thermal protection behavior does the TPS7433DR exhibit during overload?

The TPS7433DR activates thermal shutdown at 150°C junction temperature, disabling output until junction cools to ~130°C. During sustained overload, it first engages current limiting (~500 mA), causing output voltage to fold back linearly - this dual-stage protection prevents catastrophic failure while allowing safe recovery once fault clears.

Is the TPS7433DR pin-compatible with other members of the TPS74xx family?

Yes - all TPS74xx variants (TPS7415, TPS7418, TPS7425, TPS7430, TPS7433) share identical SOIC-8 pinout, electrical interface, and functional block diagram. Only the output voltage differs; substituting TPS7433DR for TPS7418DR requires no PCB changes but mandates verification of downstream voltage tolerance.