Texas Instruments TPS274C65CPHWRHAR

Overview

TPS274C65CPHWRHAR from Texas Instruments is a quad-channel smart high-side switch with 72 mΩ R_ON, adjustable current limiting (290 mA–2.26 A per channel), integrated thermal shutdown, short-to-ground protection, and wire-break/short-to-supply diagnostics-designed for industrial digital output modules operating at 12–36 V supply.

For engineers reviewing the TPS274C65CPHWRHAR datasheet, TPS274C65CPHWRHAR pinout, TPS274C65CPHWRHAR application, or TPS274C65CPHWRHAR equivalent, this device delivers precise load control, fault-resilient operation in PLC I/O systems, and diagnostic visibility without external sensing components.

Technical Context

The TPS274C65CPHWRHAR integrates four independent high-side power switches with internal charge pump, output clamp for inductive demagnetization, and configurable latch/auto-retry fault handling via the LATCH pin. Each channel features dedicated open-drain STx fault reporting and programmable current limit via ILIMCFG resistor.

It operates with dual supply domains: VS (12–36 V) powers the switching FETs and internal regulator, while VDD (3.0–5.5 V) supplies logic and diagnostics. The REG_EN pin enables or disables the internal 3.3 V regulator, allowing optional external VDD sourcing derived from VS to reduce dissipation.

Key Specifications

Pinout & Package

VQFN-40 (RHA) package with 6.0 mm × 6.0 mm footprint, 0.5 mm pin pitch, and thermally enhanced exposed PowerPAD™ connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS274C65CPHWRHAR, the CP variant offers reduced current limit headroom but identical integration and diagnostics, while the NIS5132MN1TXG sacrifices channel count, programmability, and diagnostic depth for basic overcurrent protection in non-networked systems.

Availability

TPS274C65CPHWRHAR is available at Aetrix Electronics and suitable for industrial PLC systems, IOLink master ports, and sensor supply modules requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TPS274C65CPHWRHAR 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 TPS274C65 family targets industrial automation applications-specifically digital output modules and intelligent I/O subsystems-where robustness, diagnostics, and high channel density are mandatory.

FAQ

What is the maximum continuous load current per channel for TPS274C65CPHWRHAR?

The TPS274C65CPHWRHAR supports up to 2 A DC per channel at 85°C ambient when all four channels are enabled. Derating applies above 85°C: at 125°C junction, the safe continuous current drops to ~1.6 A per channel due to thermal limits and R_ON increase. The device's 72 mΩ R_ON and thermal shutdown (160–210°C) ensure reliable operation within these bounds. TPS274C65CPHWRHAR maintains specified performance across its full –40°C to +125°C operating range.

How does the ILIMCFG pin configure the current limit on TPS274C65CPHWRHAR?

The ILIMCFG pin on TPS274C65CPHWRHAR accepts an external resistor to GND to select one of eight factory-trimmed current limit thresholds-from 290 mA to 2.26 A-using a 3-bit internal DAC. For example, a 110 kΩ resistor sets the nominal limit to 2.26 A. Resistor tolerance must be ≤1% to maintain accuracy. This resistor-based method eliminates firmware dependencies and allows hardware-only current limit tuning across production batches. TPS274C65CPHWRHAR uses the same ILIMCFG scheme as the CP variant but with higher endpoint values.

Does TPS274C65CPHWRHAR support short-to-supply detection, and how is it implemented?

Yes, TPS274C65CPHWRHAR provides short-to-supply detection during the OFF state when DIAG_EN is HIGH. It monitors OUTx voltage relative to VS using an internal comparator; if V_OUTx rises above a threshold (~6 V) while the channel is disabled, the device flags a short-to-supply fault on the corresponding STx pin. This feature requires no external components and enables early detection of wiring faults (e.g., accidental connection to VS instead of load). TPS274C65CPHWRHAR implements this alongside wire-break detection to cover both open- and short-circuit failure modes.

Can TPS274C65CPHWRHAR drive inductive loads without external clamping components?

Yes, TPS274C65CPHWRHAR integrates an active output clamp that safely dissipates energy from inductive kickback (e.g., solenoids, relays) without requiring external flyback diodes. During turn-off, the clamp activates to limit V_DS to 33–50 V depending on VS, preventing voltage overshoot that could damage downstream circuitry. This internal clamp works across the full 12–36 V VS range and is automatically engaged-no configuration needed. TPS274C65CPHWRHAR thus simplifies design, reduces BOM count, and improves reliability in industrial actuator interfaces.

What is the function of the LATCH pin on TPS274C65CPHWRHAR, and how does it affect fault recovery?

The LATCH pin on TPS274C65CPHWRHAR configures fault recovery behavior: pulled HIGH enables latched-off mode (channel remains disabled until ENx or LATCH toggles), while pulled LOW enables auto-retry mode (channel re-enables after t_RETRY = 0.6 ms once faults clear). This selection is critical for system safety architecture-latch mode suits fail-safe shutdown in critical systems, while auto-retry supports self-healing in non-critical loads. TPS274C65CPHWRHAR retains this pin's function identically to the CP variant, ensuring consistent design reuse across the family.