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Texas Instruments XTR117AIDGKT
- Part No.:
- XTR117AIDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Sensor and Detector Interfaces
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
XTR117AIDGKT.pdf
- Description:
- IC CURRENT TRANSMITTER 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:348
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Product details
Overview
XTR117AIDGKT from Texas Instruments is a precision 4–20mA current-loop transmitter IC designed for industrial sensor signal conditioning and two-wire field transmitters. It features 100× current gain (IO = 100 × IIN), ±0.05% span error, 130µA quiescent current, 5V on-chip regulator, and operates across –40°C to +125°C in VSSOP-8 package. It enables accurate voltage-to-current conversion in flow, temperature, and pressure transducers.
For engineers reviewing the XTR117AIDGKT datasheet, XTR117AIDGKT pinout, XTR117AIDGKT application, or XTR117AIDGKT equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with functional distinctions.
Technical Context
The XTR117AIDGKT implements a fixed-gain (100 A/A) current-input architecture where input current at IIN directly controls output current IO, eliminating need for external gain-setting resistors. Its internal op-amp drives an external NPN transistor (Q1) via B and E pins, enabling high-power loop drive while isolating thermal effects from the precision core.
It integrates a 5V regulator (VREG) referenced to IRET, with current return sensing to compensate for external circuit power draw. The device requires no external reference and supports reverse-voltage protection via diode bridge - all within a 7.5V–36V loop supply range and full industrial temperature operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Gain | 100 A/A - Output current IO = 100 × IIN; enables direct scaling of µA-level sensor currents to 4–20mA loop output without gain calibration. |
| Span Error | ±0.05% - Maximum deviation between ideal and actual 4–20mA transfer curve; ensures <100µA absolute error over full scale at 25°C. |
| Nonlinearity Error | ±0.003% - Peak deviation from best-fit line across 0.2–25mA range; critical for high-fidelity analog transmission in precision instrumentation. |
| Quiescent Current | 130µA - Total supply current consumed by IC alone; sets minimum loop current floor and enables ultra-low-power two-wire operation. |
| VREG Output | 5V ±0.1V - Regulated supply for external circuitry (e.g., ADC, sensor bias); accuracy includes load and temperature variation per CSO:SHE. |
| Loop Supply Range | 7.5V to 36V - Minimum compliance voltage allows use with standard 24V DC loops and accommodates long-cable IR drops. |
| Operating Temp | –40°C to +125°C - Fully specified performance across extended industrial range; supports deployment in harsh environments like engine bays or process vessels. |
Pinout & Package
The XTR117AIDGKT is packaged in an 8-pin VSSOP (DGK) with 3mm × 4.9mm footprint and exposed thermal pad on underside. Pin 1 is NC (no connection); thermal pad must be connected to IRET or left floating per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC (Pin 1) | No connection | Unused terminal; must remain unconnected on PCB to avoid parasitic coupling or latch-up risk. |
| IIN (Pin 2) | Current input | Sinks input current (e.g., from RIN-driven voltage source); zero-volt node referenced to IRET enables high-impedance input interface. |
| IRET (Pin 3) | Local ground return | Reference node for VREG and input circuitry; returns all external current drawn from VREG to maintain accurate IO control. |
| IO (Pin 4) | Current output | Source terminal for regulated 4–20mA loop current; connects to load resistor RL and loop return path. |
| E (Emitter, Pin 5) | External transistor emitter | Connects to emitter of external NPN transistor (e.g., TIP29C); carries full output current while isolating heat from die. |
| B (Base, Pin 6) | External transistor base | Drives base of external NPN transistor; provides precise current-controlled base current to sustain linear output operation. |
| V+ (Pin 7) | Loop power supply | Accepts 7.5–36V loop supply; powers internal circuitry and supplies current to external transistor collector path. |
| VREG (Pin 8) | 5V regulator output | Provides regulated 5V for external sensors or signal conditioning; output voltage referenced to IRET, not ground. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5V regulator | Supplies up to 3.8mA to external circuitry while maintaining sub-4mA minimum loop current - eliminates need for separate LDO in compact transmitters. |
| Current-return sensing (IRET) | Compensates for VREG load current in real time, ensuring IO remains accurate even when powering external ADCs or bridges - no software correction required. |
| Low quiescent current (130µA) | Enables true two-wire operation with minimal headroom loss; allows full 4–20mA range to be preserved even at lowest loop voltages (7.5V). |
| High-accuracy current gain (100 A/A) | Eliminates external gain resistors and associated drift/tolerance errors; achieves ±0.05% span error without trimming or calibration. |
| External transistor drive (B/E pins) | Offloads >99% of output power dissipation to external NPN device, preventing thermal-induced gain/offset drift in the precision core. |
Applications
| Flow Transmitter | Temperature Transmitter |
|---|---|
Use Scenario: Measures volumetric flow rate using differential pressure across an orifice plate, with analog output transmitted over 1km twisted-pair cable. IC Role / Device Role / Timing Role: Voltage-to-current converter that scales bridge output (0–25mV) to 4–20mA loop signal; VREG powers bridge excitation and signal conditioning amplifier. Use Value: Maintains ±0.05% span accuracy despite cable capacitance and ambient temperature swings from –25°C to +70°C. |
Use Scenario: RTD-based temperature sensor in chemical reactor vessel, requiring intrinsically safe 4–20mA output with local signal conditioning. IC Role / Device Role / Timing Role: Precision current-output driver for 3-wire RTD measurement circuit; IRET serves as local ground for Wheatstone bridge and PGA. Use Value: Enables full –40°C to +125°C operation with <0.1°C equivalent error due to ±0.003% nonlinearity and low thermal drift. |
| Pressure Transducer | PLC Analog Input Module |
Use Scenario: MEMS pressure sensor in HVAC duct monitoring system, housed in compact metal enclosure with limited PCB area. IC Role / Device Role / Timing Role: Two-wire transmitter IC driving external TIP29C transistor; VSSOP-8 package minimizes board space while thermal pad improves reliability. Use Value: Delivers 4–20mA output with 130µA quiescent current, allowing use of 24V loop supply with >10V headroom for EMI filtering components. |
Use Scenario: Modular PLC backplane with hot-swappable analog input cards accepting 4–20mA field signals from multiple transmitters. IC Role / Device Role / Timing Role: Field-side current-loop transmitter providing standardized output compatible with HART-enabled receivers; supports 2nF bypass for HART frequency stability. Use Value: Ensures interoperability with industry-standard receivers via guaranteed 7.5–36V compliance and ±0.05% span tolerance across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4–20mA current-loop transmitter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| XTR115IDGKT | Includes 2.5V reference output in addition to 5V regulator; higher quiescent current (220µA typical). | Required when local 2.5V reference is needed for ratiometric ADCs or bridge excitation - adds functionality but increases power and cost. | Select XTR115IDGKT only if the 2.5V reference is actively used; otherwise XTR117AIDGKT offers lower IQ and simpler BOM. |
| XTR116IDGKT | Includes 4.096V reference output instead of 2.5V; same 5V regulator and quiescent current as XTR117AIDGKT. | Preferred for systems using 4.096V references to maximize ADC resolution (e.g., 12-bit SAR with 4.096V VREF). | Choose XTR116IDGKT when 4.096V reference is required; otherwise XTR117AIDGKT provides identical current-loop performance with no reference overhead. |
Compared with XTR115IDGKT and XTR116IDGKT, the XTR117AIDGKT delivers identical 4–20mA accuracy and loop drive capability but omits the integrated voltage reference - reducing quiescent current by 90µA and simplifying layout for applications where external references are already available or unnecessary.
Availability
XTR117AIDGKT is available at Aetrix Electronics and suitable for flow transmitter design, temperature transmitter development, and PLC analog input module production requiring stable component supply and long-term industrial-grade availability.
Supply support for XTR117AIDGKT 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 company specializing in analog and embedded processing technologies, with leadership in precision signal chain and power management solutions.
The XTR117AIDGKT belongs to TI's XTR family of 4–20mA current-loop transmitters, engineered specifically for high-accuracy, low-power, two-wire industrial sensor interfaces in harsh environments.
FAQ
What is the function of the IRET pin on the XTR117AIDGKT?
The IRET pin on the XTR117AIDGKT serves as the local ground return for the internal 5V regulator (VREG) and any external circuitry powered from it. It enables accurate current-loop output by sensing and compensating for current drawn from VREG - ensuring IO remains precisely proportional to IIN even when powering external sensors or amplifiers. This function is essential for maintaining ±0.05% span accuracy in real-world transmitter designs.
Can the XTR117AIDGKT operate without an external transistor?
The XTR117AIDGKT can operate without an external transistor for low-current applications (<10mA) and low loop voltages (<15V), but TI explicitly recommends using an external NPN transistor (e.g., TIP29C) for full 4–20mA operation. Without it, on-die power dissipation rises significantly - risking thermal drift and potential damage above 12mA. The B and E pins are provided specifically to drive such a transistor and isolate heat from the precision core.
What is the maximum load resistance supported by the XTR117AIDGKT at 24V loop supply?
At 24V loop supply, the XTR117AIDGKT supports a maximum load resistance of 850Ω while maintaining full 20mA output - calculated as (24V − 7.5V) / 20mA = 825Ω, with 25Ω margin for safety and stability. This assumes use of an external transistor and proper decoupling; higher loads require increased V+ or reduced output current to stay within the 7.5V minimum compliance voltage.
Does the XTR117AIDGKT support HART communication?
Yes, the XTR117AIDGKT supports HART communication when configured with appropriate bypass capacitance: TI recommends 2nF–3nF between V+ and IO (instead of the default 10nF) to preserve bandwidth above 1.2kHz for HART FSK signals. The device's low noise (0.6µVpp) and stable current output ensure reliable digital overlay on the 4–20mA analog signal without distortion or interference.
How does the XTR117AIDGKT achieve ±0.05% span error?
The XTR117AIDGKT achieves ±0.05% span error through a combination of laser-trimmed internal resistors, matched transistor pairs in its current-mirror gain stage, and on-die temperature compensation circuits - all validated across –40°C to +125°C. This specification is measured under defined conditions (TA = 25°C, V+ = 24V, RIN = 20kΩ) and includes initial error and thermal drift contributions, making it a guaranteed parameter for production transmitters.
XTR117AIDGKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Current Transmitter
- Input Type:
- Voltage
- Output Type:
- Voltage
- Current - Supply:
- 20 mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
XTR117AIDGKT FAQ
1.How can I place an order for XTR117AIDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for XTR117AIDGKT 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 XTR117AIDGKT reliable?
The price and inventory of XTR117AIDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for XTR117AIDGKT is usually 5 days.
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XTR117AIDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your XTR117AIDGKT 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 XTR117AIDGKT?
For technical support, including XTR117AIDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your XTR117AIDGKT requirements.
6.How does Aetrix verify that XTR117AIDGKT is sourced from the original manufacturer or authorized distributors?
All XTR117AIDGKT 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 XTR117AIDGKT meets industry standards.
7.What is the process for return or replacement of XTR117AIDGKT?
All XTR117AIDGKT units undergo pre-shipment inspection (PSI). If there is an issue with XTR117AIDGKT, 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 XTR117AIDGKT part is unused and in its original packaging.
Return procedure for XTR117AIDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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