Texas Instruments TPS274C65ASWRHAR

Overview

TPS274C65ASWRHAR from Texas Instruments is a quad-channel smart high-side switch with SPI interface, 72mΩ R_ON, adjustable current limiting (250mA–2.2A), integrated diagnostics (current sense, open-load, short-to-supply detection), and reverse current blocking-designed for industrial digital output modules driving 24V resistive/inductive/capacitive loads.

For engineers reviewing the TPS274C65ASWRHAR datasheet, TPS274C65ASWRHAR pinout, TPS274C65ASWRHAR application, or TPS274C65ASWRHAR equivalent, this page delivers verified electrical specs, SPI timing constraints, thermal shutdown behavior, fault reporting logic, and package-level layout guidance for PLC I/O and sensor supply designs.

Technical Context

The TPS274C65ASWRHAR implements four independent N-channel MOSFET high-side switches with integrated charge pump, current-sense amplifier, analog-to-digital converter (ADC), and configurable fault handling. Each channel supports programmable current limit via SPI register ILIM_REG[7:0], with dual-threshold inrush management enabled by INRUSH_LIMIT[1:0].

It features reverse current blocking (RCB) on all four channels, real-time load current reporting (1.73mA ISNS per 2A IOUT at RSNS = 1kΩ), and robust protection including thermal shutdown (160°C trip), VS undervoltage lockout (9.3V falling), and short-to-ground recovery with retry timer (0.6ms).

Key Specifications

Pinout & Package

TPS274C65ASWRHAR uses a 40-pin VQFN (RHA) package, 6.0mm × 6.0mm, 0.5mm pitch, with exposed thermal pad connected to GND. Pin count and layout match the AS/ASH variants (Figure 5-1); RCBx, LEDOUTx, and ISNS pins are functional in this variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar smart high-side switch applications.

Compared with TPS274C65ASWRHAR, TPS274C65ASHRHA offers extended current range and embedded ADC for richer diagnostics, while TPS27082LARHAR trades channel count and intelligence for lower R_ON and reduced complexity-making it unsuitable as a drop-in replacement but viable for simplified single-load applications.

Availability

TPS274C65ASWRHAR is available at Aetrix Electronics and suitable for industrial PLC digital output modules, IOLink master ports, and sensor power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-compliant automation systems.

Supply support for TPS274C65ASWRHAR 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 for industrial, automotive, and communications markets.

The TPS274C65xS product line is engineered for industrial control systems requiring intelligent, protected, and diagnosable 24V high-side switching-addressing demands for predictive maintenance, modular I/O, and robust fieldbus interoperability.

FAQ

What is the maximum continuous load current per channel for TPS274C65ASWRHAR?

The TPS274C65ASWRHAR supports 1.6A continuous load current per channel at 85°C ambient with all four channels enabled. When only two channels operate simultaneously, the rating increases to 2.5A per channel under the same thermal conditions-enabled by its 72mΩ R_ON and 25.4°C/W junction-to-ambient thermal resistance in the 6mm × 6mm VQFN package.

Does TPS274C65ASWRHAR support reverse current blocking, and how is it implemented?

Yes, TPS274C65ASWRHAR provides reverse current blocking (RCB) on all four channels via dedicated RCB1–RCB4 output pins. These pins drive external N-channel FET gates to prevent backfeed from the load to the VS rail during off-state. The RCB comparator triggers at –64mV (typical) VS–VOUT differential, with 2µs response time and 100ms internal reset interval-ensuring reliable blocking without oscillation.

How does the current sense functionality work in TPS274C65ASWRHAR?

The TPS274C65ASWRHAR provides analog current sense via the ISNS pin, delivering a proportional output current (e.g., 1.73mA at 2A load with 1kΩ sense resistor). It also supports digital current readback via SPI register CURRENT_SENSE_CHx. Both methods are validated across –40°C to 125°C and enable real-time load monitoring without external shunt amplifiers-critical for predictive maintenance in TPS274C65ASWRHAR-based systems.

What fault conditions does TPS274C65ASWRHAR detect and report?

TPS274C65ASWRHAR detects and reports thermal shutdown (160°C), overcurrent (configurable 250mA–2.2A limit), short-to-supply (off-state), open-load (on/off-state), VS undervoltage (9.3V falling), and reverse current events. Faults are signaled collectively via the open-drain FLT pin and individually accessible through SPI status registers-allowing granular root-cause analysis in TPS274C65ASWRHAR-based industrial controllers.

Can TPS274C65ASWRHAR drive inductive loads without external components?

Yes, TPS274C65ASWRHAR integrates an output clamp that limits VDS to 44V (typical) during inductive demagnetization-enabling direct drive of relays, solenoids, and contactors without external flyback diodes. This clamp activates automatically during turn-off, reducing board space and improving reliability compared to discrete solutions using TPS274C65ASWRHAR.