Texas Instruments TPS274C65ASHRHAR

Overview

TPS274C65ASHRHAR from Texas Instruments is a quad-channel smart high-side switch with SPI interface, 72 mΩ R_ON, adjustable current limiting (290 mA to 2.45 A), integrated reverse current blocking (RCB), and real-time load current sensing via integrated ADC. It drives inductive, capacitive, and resistive loads in industrial digital output modules and IOLink master ports.

For engineers reviewing the TPS274C65ASHRHAR datasheet, TPS274C65ASHRHAR pinout, TPS274C65ASHRHAR application, or TPS274C65ASHRHAR equivalent, key selection criteria include configurable inrush current management, open-load and short-to-supply diagnostics, thermal shutdown with warning flag, and 40-pin VQFN (6 mm × 6 mm) package compatibility with isolation-critical PLC designs.

Technical Context

The device implements four independent high-side power FETs with integrated charge pump, output clamping, and dual-threshold current limiting-enabling fast capacitive load charging and safe demagnetization of inductive loads. Each channel supports programmable fault handling (latch-off or auto-retry) and reports real-time current via SPI or analog ISNS output.

Its diagnostic architecture includes on-state/off-state open-load detection, short-to-supply sensing, temperature monitoring (via TSNS), and reverse-current protection with sub-µs comparator response (t_{RCB_F} = 1.6–2.4 µs). The integrated 3.3 V internal regulator (VVDD = 3.1–3.6 V) powers logic circuitry and supports external VDD bypass.

Key Specifications

Pinout & Package

TPS274C65ASHRHAR uses a 40-pin VQFN package (RHA) with 6.0 mm × 6.0 mm footprint and 0.5 mm pitch. Exposed PowerPAD™ connects to GND for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS274C65ASHRHAR, the AS variant sacrifices digital diagnostics and RCB for lower unit cost, while the BS variant removes all sensing and protection features - making the ASH the only option supporting predictive maintenance, hot-swap safety, and full fault classification in modern industrial I/O designs.

Availability

TPS274C65ASHRHAR 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 safety-compliant designs.

Supply support for TPS274C65ASHRHAR 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 for industrial, automotive, and communications markets.

The TPS274C65xS product line delivers intelligent, SPI-configurable high-side switches optimized for next-generation industrial I/O modules demanding diagnostics, reliability, and compact 6 mm × 6 mm packaging.

FAQ

What is the maximum continuous current per channel for TPS274C65ASHRHAR at 85°C ambient?

TPS274C65ASHRHAR supports 1.6 A continuous load current per channel at 85°C ambient temperature with all four channels enabled, as specified in the Electrical Characteristics table under ILNOM. This rating assumes standard 4-layer PCB layout and accounts for thermal derating due to R_ON increase (110 mΩ at 125°C).

Does TPS274C65ASHRHAR support daisy-chain SPI configuration?

Yes, TPS274C65ASHRHAR supports daisy-chain SPI via the DSPI pin (pin 28). When pulled high, the device enters daisy-chain mode, allowing multiple units to share SCLK, SDI, and CS lines while serially forwarding SDO to the next device - reducing MCU GPIO count in multi-channel I/O systems.

How does the reverse current blocking (RCB) function work in TPS274C65ASHRHAR?

TPS274C65ASHRHAR implements RCB using four dedicated gate-drive outputs (RCB1–RCB4) that control external N-channel FETs. When VS drops below VOUT, the RCB comparator triggers within 1.6–2.4 µs (t_{RCB_F}) to disable the FET, preventing backfeed - critical for hot-swap and redundant power rail applications.

Can TPS274C65ASHRHAR detect open-load conditions in both ON and OFF states?

Yes, TPS274C65ASHRHAR provides dual-mode open-load detection: on-state wire-break (WB_ON) thresholds at 0.38–0.61 mA and off-state pull-up (WB_OFF) at 38–64 µA. These are independently configurable per channel via SPI registers WB_ON_CHx and WB_OFF_CHx, enabling robust fault coverage across all operational modes.

What is the purpose of the ISNS pin on TPS274C65ASHRHAR?

The ISNS pin on TPS274C65ASHRHAR delivers an analog current output proportional to load current (I_OUT/I_SNS = 1160×), enabling real-time monitoring without SPI traffic. With 1 kΩ sense resistor, it produces 0.002–1.77 mA across 5 mA–2 A loads - supporting external ADC sampling or analog fault comparators for low-latency response.