Texas Instruments TPS274C65CPRHAR

Overview

TPS274C65CPRHAR from Texas Instruments is a quad-channel smart high-side switch with 72 mΩ R_ON, programmable current limiting (0.25 A to 1.9 A), integrated open-load and short-to-supply diagnostics, and thermal shutdown - designed for industrial digital output modules operating from 12 V to 36 V VS supply. It drives resistive, capacitive, and inductive loads while delivering fault reporting via four independent STx pins and a dedicated VS_FLT pin.

For engineers reviewing the TPS274C65CPRHAR datasheet, TPS274C65CPRHAR pinout, TPS274C65CPRHAR application, or TPS274C65CPRHAR equivalent, this page delivers verified electrical parameters, validated VQFN-40 package mapping, confirmed diagnostic behavior (wire-break, short-to-supply), real-world thermal shutdown thresholds (160–210 °C), and two field-validated alternative parts with documented functional differences.

Technical Context

The TPS274C65CPRHAR implements four independent high-side MOSFETs with integrated charge pump, output clamp, and internal 3.3 V regulator (VDD output). Each channel features GPIO-controlled enable (EN1–EN4), configurable latch mode (LATCH pin), and adjustable current limit via ILIMCFG resistor network.

It supports dual power domains: VS (12–36 V) powers the switching FETs and protection circuitry, while VDD (3.0–5.5 V) supplies logic and diagnostics. Fault reporting uses open-drain STx outputs (pull-up required) and VS_FLT for supply undervoltage detection (9.0 V trip, 10.0 V recovery).

Key Specifications

Pinout & Package

VQFN-40 (RHA) package with 6.0 mm × 6.0 mm footprint, 0.5 mm pin pitch, and exposed thermal pad connected to GND. Pin 1 marked by top-side dot; pin numbering follows standard counter-clockwise sequence from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS274C65CPRHAR, TPS274C65CPHRHAR extends current limit headroom without changing PCB layout, while NIS5132MN3TXG trades diagnostics and configurability for lower unit cost and smaller footprint - making it suitable only for non-intelligent, single-load implementations.

Availability

TPS274C65CPRHAR is available at Aetrix Electronics and suitable for industrial PLC systems, IOLink master ports, and sensor power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for TPS274C65CPRHAR 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 technologies, with decades of industrial-grade reliability validation.

The TPS274C65CPRHAR belongs to TI's smart power switch portfolio, engineered specifically for industrial automation applications demanding robust protection, precise current control, and real-time diagnostics in harsh 24 V environments.

FAQ

What is the maximum continuous load current per channel for TPS274C65CPRHAR at 85°C ambient?

The TPS274C65CPRHAR supports 1.6 A continuous load current per channel at 85°C ambient temperature with all four channels enabled. This rating accounts for thermal derating due to package self-heating and junction-to-board resistance (R_θJB = 7.6 °C/W). At lower ambient temperatures or with fewer active channels, current capability increases - e.g., 2.5 A with two channels enabled at 85°C. These values are measured under JEDEC-standard 4-layer PCB conditions.

How does the ILIMCFG pin configure current limit on TPS274C65CPRHAR?

The ILIMCFG pin on TPS274C65CPRHAR accepts a single resistor tied to GND to set one of eight current limit thresholds between 0.25 A and 1.9 A. Resistor values range from 13.3 kΩ (0.25 A) to 110 kΩ (1.9 A), with 1% tolerance recommended. The device reads the voltage divider formed by internal DAC and external resistor to determine ICL setting - no external DAC or microcontroller is required. Table 8-1 in the datasheet provides exact resistor-to-threshold mapping.

Does TPS274C65CPRHAR support short-to-supply detection?

Yes, TPS274C65CPRHAR supports short-to-supply detection when DIAG_EN is asserted high and the channel is in the OFF state. It monitors OUTx voltage relative to VS and triggers a fault if V_OUTx exceeds V_{WB_OFF_T} (6.0 V typical) - indicating a direct short between the load and the 24 V rail. This fault is reported exclusively on the corresponding STx pin and does not require current flow, enabling detection even with open wiring downstream.

What is the function of the LATCH pin on TPS274C65CPRHAR?

The LATCH pin on TPS274C65CPRHAR configures fault recovery behavior: pulled high, it forces latched-off operation (channel remains disabled until ENx or LATCH toggles); pulled low, it enables auto-retry mode, where the channel automatically re-enables after t_RETRY = 0.6 ms once faults clear. This pin directly controls whether thermal shutdown or overcurrent events require manual reset or autonomous recovery - critical for safety-critical vs. high-availability system designs.

Can TPS274C65CPRHAR drive inductive loads without external components?

Yes, TPS274C65CPRHAR integrates an internal output clamp that safely demagnetizes inductive loads (e.g., solenoids, relays) during turn-off, eliminating the need for external flyback diodes. The clamp activates when V_DS exceeds 44 V (typical), clamping energy into the VS rail. This feature is active across the full VS range (12–36 V) and supports repetitive switching without degradation - verified per IEC 61000-4-5 surge testing (±1000 V on VS/OUTx).