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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Distribution Switches, Load Drivers

Texas Instruments TPS274C65ASHWRHAR

Name: TPS274C65ASHWRHAR
Brand: Texas Instruments
SKU: TPS274C65ASHWRHAR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TPS274C65ASHWRHAR

Manufacturer:: Texas Instruments

Category:: Power Distribution Switches, Load Drivers

Package:: 40-VFQFN Exposed Pad

Datasheet:: TPS274C65ASHWRHAR.pdf

Description:: 12-V TO 36-V 65-M FOUR-CHANNEL H

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Product details

Overview

TPS274C65ASHWRHAR 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, and real-time load current sensing via integrated ADC. It drives industrial 24 V resistive, inductive, and capacitive loads while providing open-load, short-to-supply, and thermal fault diagnostics.

For engineers reviewing the TPS274C65ASHWRHAR datasheet, TPS274C65ASHWRHAR pinout, TPS274C65ASHWRHAR application, or TPS274C65ASHWRHAR equivalent, this page delivers verified electrical specs, SPI timing constraints, diagnostic register behavior, thermal shutdown thresholds, and channel paralleling capability - all critical for PLC digital output module design and IOLink master port implementation.

Technical Context

The TPS274C65ASHWRHAR implements four independent N-channel MOSFET high-side switches with integrated charge pump, reverse current blocking FETs per channel, and a 12-bit ADC for digitized current sense. Its SPI interface supports daisy-chain configuration (via DSPI pin) and enables per-channel current limit programming, fault status polling, and diagnostic enablement without external components.

It features dual-threshold inrush management (configurable higher initial limit), on/off-state open-load detection, short-to-supply detection, and thermal warning (110–150 °C) with hysteresis (20–35 °C). The device operates across –40 °C to +125 °C ambient and supports VS supply from 12 V to 36 V with internal 3.3 V regulator (±3% accuracy, 50 mA current limit).

Key Specifications

Parameter	Value and Actual Design Meaning
R_ON (per channel)	72 mΩ at 25 °C; ensures ≤1.44 W conduction loss at 2 A, enabling compact thermal design in 6 mm × 6 mm VQFN.
Current limit range	290 mA to 2.45 A (ASH variant); supports precise system-level protection tuning for diverse loads including incandescent lamps and solenoids.
SPI timing (max f_SCLK)	10 MHz (t_SPI ≥ 100 ns); allows deterministic control loop execution in real-time PLC applications with <25 µs turn-on delay.
Thermal shutdown threshold	160–210 °C junction; triggers automatic channel disable with 20–35 °C hysteresis to prevent latch-up during sustained overload.
VS operating range	12 V to 36 V; compatible with standard 24 V industrial bus with undervoltage lockout (9.3 V fall, 10.3 V rise) and warning (12.5 V fall, 13.5 V rise).
ADC resolution & output	12-bit integrated ADC with 2.8 V reference; reports digitized load current (I_OUT/I_SNS = 1160:1 ratio) over SPI for predictive maintenance.
Reverse current blocking	Enabled per channel via RCBx pins; blocks reverse current when V_OUT > V_VS by >28 mV (rising) or < –64 mV (falling), protecting upstream supplies.

Pinout & Package

TPS274C65ASHWRHAR uses a 40-pin VQFN package (RHA), 6.0 mm × 6.0 mm, 0.5 mm pitch, with exposed thermal pad connected to GND. Pin functions are validated per TI SLVSFZ2C Rev FEBRUARY 2024 datasheet Figures 5-1 and Table 5-1 for ASH version.

Pin/Terminal	Circuit Role	Design Meaning
OUT1–OUT4	High-side switched outputs	Four independent 24 V load drive nodes; each supports 2 A continuous (1.6 A @ 85 °C ambient) with integrated clamp diode for inductive demagnetization.
VS (pins 14–17, 34–37)	Main power input	24 V supply rail connection; eight dedicated pins minimize IR drop and improve thermal dissipation under full 4-channel load.
SCLK, SDI, SDO, CS	SPI interface	Full-duplex 4-wire SPI supporting daisy-chain mode (DSPI pin HI); enables isolated microcontroller control with minimal GPIO usage.
RCB1–RCB4	Reverse current blocking gate drivers	Open-drain outputs driving external N-FET gates; activate reverse-blocking path when V_OUT exceeds V_VS beyond threshold.
FLT	Fault indicator	Open-drain active-low output asserting on any channel fault (overcurrent, thermal, short-to-supply, open-load); requires external pull-up to VDD.
READY	Power-on ready signal	Active-low logic output indicating internal regulator stabilization and SPI readiness; used for synchronized system boot sequencing.
REG_EN	Internal regulator enable	Logic input controlling internal 3.3 V LDO; float for enable, tie to GND for external VDD supply (3.0–5.5 V).

Key Features

Feature	Design Value
Quad-channel SPI-controlled switching	Enables centralized, isolated control of four independent 24 V loads using only 4 MCU GPIOs - eliminating optocouplers and reducing BOM count.
Configurable inrush current limit	Higher initial current limit during turn-on accelerates capacitor charging and incandescent lamp warm-up without tripping protection.
Dual-threshold open-load detection	Supports both on-state (0.49 mA threshold) and off-state (51 µA pull-up) wire-break detection - critical for safety-critical sensor supply monitoring.
Integrated analog-to-digital converter	Digitizes load current with 12-bit resolution and 1160:1 sense ratio, enabling remote current trending and anomaly detection over isolation barriers.
Per-channel reverse current blocking	Prevents backfeed from downstream loads into shared 24 V bus - essential for modular I/O systems with hot-swap capability.

Applications

Industrial PLC Digital Output Module	IOLink Master Port
Use Scenario: Driving multiple field actuators (valves, relays, indicators) from a centralized controller rack with diagnostics and fault reporting. IC Role / Device Role: Quad-channel high-side switch providing isolated 24 V output control, current limiting, and real-time load current telemetry. Use Value: Eliminates discrete protection circuitry per channel; reduces PCB area by >40% vs. discrete MOSFET + driver + sense solutions while enabling predictive maintenance via SPI-reported current data.	Use Scenario: Powering and managing up to four IOLink devices (sensors/actuators) on a single master port with bidirectional diagnostics. IC Role / Device Role: Smart power switch delivering regulated 24 V supply with short-circuit resilience, open-load detection, and digital current feedback to the IOLink master ASIC. Use Value: Enables Class A/B compliance with built-in short-to-supply detection and configurable current limits - reducing need for external fault-handling logic and improving system uptime.
Sensor Supply Management	Industrial Gate Drive Interface
Use Scenario: Providing stable, monitored 24 V power to analog and digital sensors in harsh environments with EMI and voltage transients. IC Role / Device Role: Protected high-side supply switch with undervoltage warning (12.5 V), thermal warning (130 °C), and open-load reporting for sensor health monitoring. Use Value: Detects broken sensor wiring (off-state open-load) or failed sensor (short-to-supply) before system-level faults occur - improving functional safety integrity.	Use Scenario: Driving external high-voltage gate drivers (e.g., for IGBTs or SiC MOSFETs) requiring clean, current-limited 24 V enable signals. IC Role / Device Role: Robust, low-R_ON switch with fast turn-on (<42 µs) and integrated output clamp to absorb gate-drive energy during turn-off. Use Value: Prevents gate driver latch-up during transient overloads; clamp diode eliminates need for external freewheeling components, simplifying layout and improving reliability.

Industrial PLC Digital Output Module

IOLink Master Port

Use Scenario: Driving multiple field actuators (valves, relays, indicators) from a centralized controller rack with diagnostics and fault reporting.

IC Role / Device Role: Quad-channel high-side switch providing isolated 24 V output control, current limiting, and real-time load current telemetry.

Use Value: Eliminates discrete protection circuitry per channel; reduces PCB area by >40% vs. discrete MOSFET + driver + sense solutions while enabling predictive maintenance via SPI-reported current data.

Use Scenario: Powering and managing up to four IOLink devices (sensors/actuators) on a single master port with bidirectional diagnostics.

IC Role / Device Role: Smart power switch delivering regulated 24 V supply with short-circuit resilience, open-load detection, and digital current feedback to the IOLink master ASIC.

Use Value: Enables Class A/B compliance with built-in short-to-supply detection and configurable current limits - reducing need for external fault-handling logic and improving system uptime.

Sensor Supply Management

Industrial Gate Drive Interface

Use Scenario: Providing stable, monitored 24 V power to analog and digital sensors in harsh environments with EMI and voltage transients.

IC Role / Device Role: Protected high-side supply switch with undervoltage warning (12.5 V), thermal warning (130 °C), and open-load reporting for sensor health monitoring.

Use Value: Detects broken sensor wiring (off-state open-load) or failed sensor (short-to-supply) before system-level faults occur - improving functional safety integrity.

Use Scenario: Driving external high-voltage gate drivers (e.g., for IGBTs or SiC MOSFETs) requiring clean, current-limited 24 V enable signals.

IC Role / Device Role: Robust, low-R_ON switch with fast turn-on (<42 µs) and integrated output clamp to absorb gate-drive energy during turn-off.

Use Value: Prevents gate driver latch-up during transient overloads; clamp diode eliminates need for external freewheeling components, simplifying layout and improving reliability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS274C65ASRHA	No integrated ADC; current sense only via analog ISNS pin; current limit range 250 mA–2.2 A.	Lacks digitized diagnostics; suitable where analog current monitoring suffices and cost sensitivity outweighs telemetry needs.	Select when SPI-based predictive maintenance is unnecessary and analog current feedback meets system requirements.
TPS274C65BSRHA	No ADC, no LED drivers, no RCB, no ISNS; basic SPI-controlled switch with same R_ON and thermal protection.	Minimal feature set; intended for cost-optimized digital output modules without diagnostics or reverse blocking.	Choose for legacy PLC designs where only basic ON/OFF control and fault flagging are required.

Compared with TPS274C65ASRHA and TPS274C65BSRHA, the TPS274C65ASHWRHAR uniquely delivers integrated 12-bit current digitization, reverse current blocking per channel, and extended current limit (up to 2.45 A), making it optimal for next-generation IOLink masters and condition-monitoring PLC outputs.

Availability

TPS274C65ASHWRHAR is available at Aetrix Electronics and suitable for industrial PLC systems, IOLink master ports, sensor supply modules, and gate drive interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS274C65ASHWRHAR 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 connectivity technologies for industrial, automotive, and communications markets.

The TPS274C65xS product line was designed specifically for intelligent 24 V industrial digital output stages - integrating protection, diagnostics, and SPI configurability to replace discrete high-side switch implementations in PLCs and IOLink systems.

FAQ

What is the maximum continuous load current per channel for TPS274C65ASHWRHAR?

The TPS274C65ASHWRHAR supports 2 A continuous load current per channel at 25 °C ambient. At 85 °C ambient, derating applies: 1.6 A with all four channels enabled, or 2.5 A with two channels enabled. This is enabled by its 72 mΩ R_ON and optimized thermal design in the 6 mm × 6 mm VQFN package. The TPS274C65ASHWRHAR datasheet specifies these values in Section 6.5 under ILNOM.

Does TPS274C65ASHWRHAR support daisy-chaining multiple devices on one SPI bus?

Yes, TPS274C65ASHWRHAR supports daisy-chain SPI configuration. When the DSPI pin is pulled high, the device enters daisy-chain mode, allowing multiple TPS274C65ASHWRHAR units to share SCLK, SDI, and CS lines while cascading SDO to SDI of the next device. This reduces MCU GPIO count and simplifies routing in multi-channel PLC modules - confirmed in Section 5 and Figure 5-1 of the TPS274C65ASHWRHAR datasheet.

How does the reverse current blocking (RCB) function work on TPS274C65ASHWRHAR?

The TPS274C65ASHWRHAR provides per-channel reverse current blocking via dedicated RCB1–RCB4 pins. Each pin drives the gate of an external N-channel FET to block current flow when V_OUT exceeds V_VS by >28 mV (rising threshold) or falls below V_VS by >64 mV (falling threshold). The RCB comparator has 1.6–2.4 µs response time and includes 100 ms internal reset interval. This functionality is documented in Section 6.5 (VRCB_R/VRCB_F) and Figure 5-1 of the TPS274C65ASHWRHAR datasheet.

What diagnostic capabilities does TPS274C65ASHWRHAR provide beyond basic overcurrent protection?

TPS274C65ASHWRHAR provides six distinct diagnostics: (1) real-time digitized load current via integrated 12-bit ADC, (2) on-state open-load detection (0.49 mA threshold), (3) off-state open-load detection (51 µA pull-up), (4) short-to-supply detection (6 V threshold), (5) thermal warning (110–150 °C) and shutdown (160–210 °C), and (6) VS undervoltage warning and lockout. All are accessible via SPI registers - detailed in Sections 6.5 and 8.3 of the TPS274C65ASHWRHAR datasheet.

Can TPS274C65ASHWRHAR drive inductive loads such as solenoids or relays?

Yes, TPS274C65ASHWRHAR is explicitly designed for inductive loads. It integrates an output clamp (internal diode) to safely demagnetize inductive energy during turn-off, supports dual-threshold current limiting for inrush management, and tolerates transient voltages up to ±1000 V surge (IEC 61000-4-5) on VS/OUT pins. These capabilities are specified in Sections 1, 3, and 6.2 of the TPS274C65ASHWRHAR datasheet and validated in typical application schematics.

TPS274C65ASHWRHAR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Package/Case:: 40-VFQFN Exposed Pad

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Switch Type:: General Purpose

Number of Outputs:: 4

Ratio - Input:Output:: 1:1

Output Configuration:: High Side

Output Type:: N-Channel

Interface:: SPI

Voltage - Load:: 12V ~ 36V

Voltage - Supply (Vcc/Vdd):: 3V ~ 5.5V

Current - Output (Max):: 2.45A

Rds On (Typ):: 72mOhm

Input Type:: Non-Inverting

Features:: Slew Rate Controlled, Status Flag

Fault Protection:: Current Limiting (Fixed), Over Temperature, Reverse Current, Short Circuit, UVLO

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 40-VQFN (6x6)

TPS274C65ASHWRHAR FAQ

1.How can I place an order for TPS274C65ASHWRHAR through Aetrix?

Please submit a Request for Quotation (RFQ) for TPS274C65ASHWRHAR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TPS274C65ASHWRHAR reliable?

The price and inventory of TPS274C65ASHWRHAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS274C65ASHWRHAR is usually 5 days.

3.What payment methods are accepted for TPS274C65ASHWRHAR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS274C65ASHWRHAR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TPS274C65ASHWRHAR?

TPS274C65ASHWRHAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TPS274C65ASHWRHAR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TPS274C65ASHWRHAR?

For technical support, including TPS274C65ASHWRHAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS274C65ASHWRHAR requirements.

6.How does Aetrix verify that TPS274C65ASHWRHAR is sourced from the original manufacturer or authorized distributors?

All TPS274C65ASHWRHAR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS274C65ASHWRHAR meets industry standards.

7.What is the process for return or replacement of TPS274C65ASHWRHAR?

All TPS274C65ASHWRHAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS274C65ASHWRHAR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TPS274C65ASHWRHAR part is unused and in its original packaging.

Return procedure for TPS274C65ASHWRHAR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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