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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog Front End (AFE)

Texas Instruments AFE781H1RRUT

Name: AFE781H1RRUT
Brand: Texas Instruments
SKU: AFE781H1RRUT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AFE781H1RRUT

Manufacturer:: Texas Instruments

Category:: Analog Front End (AFE)

Package:: 24-WFQFN

Datasheet:: AFE781H1RRUT.pdf

Description:: INTERGRATED PRECISION ADCS & DAC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AFE781H1RRUT from Texas Instruments is a 14-bit, low-power, loop-powered DAC IC with integrated HART® modem, 1.25-V reference, and 12-bit diagnostic ADC-designed for 4-mA to 20-mA industrial transmitters. It delivers 4-LSB INL, 0.07% FSR TUE over –40°C to +125°C, 180 µA quiescent current, and operates from 1.71 V supply. Used in smart sensor transmitters requiring intrinsic safety and functional safety support.

For engineers reviewing the AFE781H1RRUT datasheet, AFE781H1RRUT pinout, AFE781H1RRUT application, or AFE781H1RRUT equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support for industrial loop-powered systems.

Technical Context

The AFE781H1RRUT integrates a monotonic 14-bit voltage-output DAC, HART-compliant FSK modem (1200/2200 Hz), and 12-bit 3.84-kSPS diagnostic ADC multiplexed across internal nodes including temperature sensor, AIN0, and POL_SEL/AIN1. Its dual digital interface supports shared SPI (up to 12.5 MHz) and UART buses for concurrent DAC control and HART communication.

It features fault detection via CRC frame-error checking, windowed watchdog timer, and diagnostic ADC self-checks-enabling fail-safe output states (NAMUR or user-defined) on alarm. The internal 1.2288-MHz oscillator feeds CLK_OUT and supports slew-rate-controlled DAC updates with <65 µs settling time (¼–¾ scale).

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	14-bit DAC with monotonicity guaranteed; enables 16,384 discrete output levels for precision analog control in 4–20 mA loops.
TUE (–40°C to +125°C)	±0.07% FSR maximum; ensures full-scale accuracy remains within ±1.4 mV error at 2.0 V output range under full industrial temperature stress.
Quiescent Current	180 µA typical (PVDD only, DAC zero-scale, ADC/SPI static); allows operation from ultra-low-power loop supplies without compromising diagnostics.
HART Modem Compliance	FSK physical layer certified per HART specification; supports 1200 Hz mark / 2200 Hz space with ≤1% frequency error across –40°C to +125°C.
Diagnostic ADC	12-bit, 3.84 kSPS; monitors internal nodes (temperature, AIN0, AIN1) for autonomous health checks-critical for SIL2-capable transmitter designs.
Reference Output	1.25 V ±2 mV initial accuracy, 10 ppm/°C drift max; powers external circuitry or serves as stable DAC reference with 70–130 nF capacitive load stability.
Operating Temperature	Functional from –55°C to +125°C; specified for –40°C to +125°C-meets extended-range requirements for outdoor process instrumentation.

Pinout & Package

AFE781H1RRUT is housed in a 24-pin UQFN package (RRU), 4.00 mm × 4.00 mm, with wettable flanks and 0.4-mm pitch. Thermal resistance R_θJA = 103.1°C/W enables reliable operation in compact, sealed transmitter enclosures without forced airflow.

Pin/Terminal	Circuit Role	Design Meaning
AIN0 (Pin 15)	Analog input	Primary diagnostic ADC channel; accepts 0–1.25 V (PVDD = VDD) or 0–2.5 V (PVDD > 2.7 V) for sensor voltage monitoring.
VOUT (Pin 18)	Analog output	DAC voltage output with programmable ranges (e.g., 0.15–1.25 V or 0.4–2.0 V); drives external V-I converter with ±200 mV headroom/footroom.
MOD_OUT (Pin 23)	Analog output	HART FSK transmit output; delivers 400–800 mV_PP into 160-Ω AC-coupled load-directly interfaces with standard HART coupling networks.
RX_IN (Pin 21)	Analog input	HART receive input (internal filter path); accepts FSK signals up to 1.5 V_PP with 80–120 mV_PP sensitivity for robust carrier detection.
ALARM (Pin 24)	Digital output	Open-drain fault indicator; asserts low on CRC error, watchdog timeout, or ADC-detected fault-enables immediate system-level response.
REF_EN (Pin 5)	Digital input	Enables/disables internal 1.25-V reference; high = internal VREF active on VREFIO; low = external 1.25-V source required.
CLK_OUT (Pin 11)	Digital output	Configurable 1.2288-MHz clock output; synchronizes external logic or sampling circuits without adding timing components.
CS / SCLK / SDI / SDO (Pins 10, 7, 8, 9)	Digital interface	SPI bus (mode 1/2, up to 12.5 MHz) shared between DAC and HART arbiter-reduces PCB routing and isolation complexity.

Key Features

Feature	Design Value
Functional Safety Support	Documentation available for ISO 26262 and IEC 61508 system-level design-enables integration into SIL2-certified process control architectures.
Dual Digital Interface	SPI and UART share signal paths with HART arbiter logic-eliminates need for separate interface controllers and reduces BOM count by one IC.
Digital DAC Slew-Rate Control	Programmable linear or sinusoidal slew profiles prevent overshoot during step changes-critical for avoiding transient-induced valve actuation errors.
Integrated Diagnostics	Multiplexed ADC scans temperature, supply rails, and analog inputs autonomously-replaces discrete supervisory ICs and cuts board area by ≥25 mm².
Low-Power Loop Operation	180 µA quiescent current at 1.8 V enables full functionality (DAC + ADC + HART) within 3.5 mA of loop budget-leaving >16 mA for external V-I conversion.

Applications

Smart 4–20 mA Transmitter	HART-Enabled Pressure Sensor
Use Scenario: Two-wire field transmitter converting pressure sensor output to standardized 4–20 mA signal with digital HART communication. IC Role / Device Role / Timing Role: AFE781H1RRUT performs DAC-based current loop modulation, HART FSK encoding/decoding, and real-time self-diagnosis of sensor bias and supply integrity. Use Value: Eliminates need for discrete DAC, modem, reference, and ADC-reducing bill-of-materials by four components and enabling sub-10 mm² PCB footprint.	Use Scenario: Intrinsically safe pressure transmitter deployed in hazardous Zone 0/1 environments requiring continuous health monitoring. IC Role / Device Role / Timing Role: AFE781H1RRUT acts as the core analog front-end, delivering calibrated analog output while running periodic ADC-based diagnostics on internal temperature and rail voltages. Use Value: On-chip thermal alarm (trip at 130°C ±5°C) and CRC-protected register access enable predictive maintenance and reduce unplanned downtime by detecting early-stage thermal degradation.
Process Controller Analog Output	Functional Safety Loop Calibrator
Use Scenario: PLC analog output module generating precise 4–20 mA setpoints for control valves in chemical processing plants. IC Role / Device Role / Timing Role: AFE781H1RRUT serves as the final-stage DAC with NAMUR-compliant fail-safe output (e.g., 3.6 mA or 20.5 mA) triggered by watchdog or CRC failure. Use Value: Guaranteed 0.07% FSR TUE across –40°C to +125°C ensures setpoint accuracy remains within ±0.8 mA-even inside unheated outdoor cabinets during winter.	Use Scenario: Portable field calibrator verifying transmitter linearity and HART responsiveness during commissioning and maintenance. IC Role / Device Role / Timing Role: AFE781H1RRUT functions as a reference-grade DAC source with built-in HART loopback capability-validating both analog and digital layers simultaneously. Use Value: Integrated 12-bit diagnostic ADC measures its own VOUT and internal references, enabling self-calibration traceability without external metrology equipment.

Smart 4–20 mA Transmitter

HART-Enabled Pressure Sensor

Use Scenario: Two-wire field transmitter converting pressure sensor output to standardized 4–20 mA signal with digital HART communication.

IC Role / Device Role / Timing Role: AFE781H1RRUT performs DAC-based current loop modulation, HART FSK encoding/decoding, and real-time self-diagnosis of sensor bias and supply integrity.

Use Value: Eliminates need for discrete DAC, modem, reference, and ADC-reducing bill-of-materials by four components and enabling sub-10 mm² PCB footprint.

Use Scenario: Intrinsically safe pressure transmitter deployed in hazardous Zone 0/1 environments requiring continuous health monitoring.

IC Role / Device Role / Timing Role: AFE781H1RRUT acts as the core analog front-end, delivering calibrated analog output while running periodic ADC-based diagnostics on internal temperature and rail voltages.

Use Value: On-chip thermal alarm (trip at 130°C ±5°C) and CRC-protected register access enable predictive maintenance and reduce unplanned downtime by detecting early-stage thermal degradation.

Process Controller Analog Output

Functional Safety Loop Calibrator

Use Scenario: PLC analog output module generating precise 4–20 mA setpoints for control valves in chemical processing plants.

IC Role / Device Role / Timing Role: AFE781H1RRUT serves as the final-stage DAC with NAMUR-compliant fail-safe output (e.g., 3.6 mA or 20.5 mA) triggered by watchdog or CRC failure.

Use Value: Guaranteed 0.07% FSR TUE across –40°C to +125°C ensures setpoint accuracy remains within ±0.8 mA-even inside unheated outdoor cabinets during winter.

Use Scenario: Portable field calibrator verifying transmitter linearity and HART responsiveness during commissioning and maintenance.

IC Role / Device Role / Timing Role: AFE781H1RRUT functions as a reference-grade DAC source with built-in HART loopback capability-validating both analog and digital layers simultaneously.

Use Value: Integrated 12-bit diagnostic ADC measures its own VOUT and internal references, enabling self-calibration traceability without external metrology equipment.

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog front-end applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AFE881H1RRUT	16-bit DAC resolution (vs. 14-bit), identical pinout, same HART/modem/ADC/reference subsystems.	Required where higher resolution (e.g., <0.1% FS accuracy) is mandated for high-end flow or level transmitters.	Select AFE881H1RRUT when 16-bit monotonicity and <4 LSB INL are needed; otherwise AFE781H1RRUT offers optimal cost/performance for standard industrial transmitters.
AD5758ACPZ-RL7	No integrated HART modem; requires external HART IC (e.g., HT1000); 16-bit DAC, ±0.01% FSR TUE, but 1.2 mA quiescent current.	Suitable for non-HART or legacy 4–20 mA-only systems where ultra-low TUE outweighs power and integration trade-offs.	Choose AD5758ACPZ-RL7 only if HART is unnecessary and sub-0.02% FSR accuracy is critical-AFE781H1RRUT provides superior integration and 6× lower power for HART-enabled designs.

Compared with AFE881H1RRUT, AFE781H1RRUT trades 2 bits of resolution for lower cost and identical functional safety, HART, and diagnostic capabilities; versus AD5758ACPZ-RL7, it delivers full HART integration and 6.7× lower quiescent current-making it the only single-chip solution meeting IEC 61000-4-5 surge immunity and SIL2 requirements in loop-powered form factors.

Availability

AFE781H1RRUT is available at Aetrix Electronics and suitable for 4–20 mA loop-powered transmitters, HART-enabled process sensors, and functional safety-certified industrial control systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AFE781H1RRUT 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 and embedded processing technologies, with decades of expertise in industrial signal chain solutions and functional safety certification.

The AFE781H1RRUT belongs to TI's AFEx81H1 family of highly integrated analog front-ends-designed specifically to replace multi-chip transmitter designs with a single IC that meets HART, intrinsic safety, and SIL2 system requirements.

FAQ

What is the maximum operating temperature range for the AFE781H1RRUT?

The AFE781H1RRUT is fully specified from –40°C to +125°C and remains functional from –55°C to +125°C. This extended operational range supports deployment in harsh environments such as oilfield downhole equipment, outdoor chemical plant instrumentation, and unheated utility metering enclosures where ambient temperatures exceed standard industrial limits.

Does the AFE781H1RRUT include an integrated HART modem?

Yes, the AFE781H1RRUT includes a HART-compliant FSK modem certified to the HART physical layer specification. It supports 1200 Hz mark and 2200 Hz space frequencies with ≤1% frequency error across –40°C to +125°C, and provides dedicated MOD_OUT and RX_IN pins for direct connection to standard HART coupling networks.

Can the AFE781H1RRUT operate from a 1.8-V supply?

Yes, the AFE781H1RRUT operates from a 1.71-V to 1.89-V PVDD supply (with VDD externally supplied), consuming only 180 µA typical quiescent current. At this voltage, the DAC output range is 0.15 V to 1.25 V (RANGE = 0) or 0.2 V to 1.0 V (RANGE = 1), enabling compatibility with ultra-low-power loop-powered systems.

How does the diagnostic ADC in the AFE781H1RRUT support functional safety?

The AFE781H1RRUT's 12-bit diagnostic ADC continuously monitors internal nodes-including temperature, AIN0, and POL_SEL/AIN1-and triggers ALARM pin assertion or fail-safe output state upon detecting out-of-range conditions. This autonomous self-check capability is documented for use in IEC 61508 SIL2 system designs, reducing reliance on external supervision.

What package type is used for the AFE781H1RRUT?

The AFE781H1RRUT uses the RRU package: a 24-pin UQFN (ultra-thin quad flat no-lead) measuring 4.00 mm × 4.00 mm with 0.4-mm pitch and wettable flanks. This compact, thermally efficient package supports reflow soldering and automated optical inspection-ideal for high-density industrial transmitter PCBs.

AFE781H1RRUT Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

package:: 24-WFQFN

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Number of Bits:: 12, 14, 16

Number of Channels:: 2

Power (Watts):: -

Voltage - Supply, Analog:: 1.71V ~ 1.89V

Voltage - Supply, Digital:: 1.71V ~ 5.5V

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

AFE781H1RRUT FAQ

1.How can I place an order for AFE781H1RRUT through Aetrix?

Please submit a Request for Quotation (RFQ) for AFE781H1RRUT 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 AFE781H1RRUT reliable?

The price and inventory of AFE781H1RRUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AFE781H1RRUT is usually 5 days.

3.What payment methods are accepted for AFE781H1RRUT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AFE781H1RRUT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AFE781H1RRUT?

AFE781H1RRUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AFE781H1RRUT 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 AFE781H1RRUT?

For technical support, including AFE781H1RRUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AFE781H1RRUT requirements.

6.How does Aetrix verify that AFE781H1RRUT is sourced from the original manufacturer or authorized distributors?

All AFE781H1RRUT 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 AFE781H1RRUT meets industry standards.

7.What is the process for return or replacement of AFE781H1RRUT?

All AFE781H1RRUT units undergo pre-shipment inspection (PSI). If there is an issue with AFE781H1RRUT, 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 AFE781H1RRUT part is unused and in its original packaging.

Return procedure for AFE781H1RRUT:

1.Submit a request within 90 days.

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

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