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Texas Instruments XTR106P
- Part No.:
- XTR106P
- Manufacturer:
- Texas Instruments
- Category:
- Sensor and Detector Interfaces
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
XTR106P.pdf
- Description:
- IC CURRENT TRANSMITTER 14CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,462
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Product details
Overview
XTR106P from Texas Instruments is a monolithic 4mA to 20mA two-wire current transmitter optimized for bridge sensor conditioning. It integrates 2.5V/5V bridge excitation references, instrumentation amplifier, second-order linearization circuitry, and regulated current output stage. Key confirmed parameters: ±25 ppm/°C max span drift, 0.25 µV/°C offset drift, 110 dB min PSRR, 86 dB min CMRR, and 7.5V–36V wide loop supply range. It is used in industrial pressure transmitters where bridge nonlinearity correction and loop-powered signal integrity are critical.
For engineers reviewing the XTR106P datasheet, XTR106P pinout, XTR106P application, or XTR106P equivalent, this page delivers verified functional identity, validated pin-level circuit roles, real-world linearity correction implementation constraints, and precise alternative part comparisons - all grounded in TI's SBOS092C production data sheet (Jan 2026 revision).
Technical Context
The XTR106P implements a voltage-to-current conversion architecture with programmable gain via external resistor RG (pins 3–4), where transconductance S = 40/RG A/V. Its linearization function modulates bridge excitation voltage (VREF2.5 or VREF5) using RLIN (pin 11) and Lin Polarity (pin 12) to inject second-order correction, achieving up to 20:1 nonlinearity improvement over uncompensated bridges.
It operates as a two-wire loop device powered from V+ (pin 10), with IRET (pin 6) serving as the local return for VREG (pin 1), VREF2.5 (pin 13), and VREF5 (pin 14). The IO output (pin 7) drives the external NPN transistor (e.g., TIP29C) base (pin 9) and emitter (pin 8) to deliver regulated 4–20 mA into the loop load, while rejecting common-mode input shifts up to 86 dB and supply variations up to 110 dB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current range | 4 mA to 20 mA - fully regulated loop current compliant with HART physical layer and industrial 2-wire standards. |
| Span drift | ±25 ppm/°C maximum - ensures <±0.05% full-scale error drift over –40°C to +85°C operating range. |
| Offset drift | 0.25 µV/°C - limits zero-point drift in high-precision bridge measurement without trimming. |
| PSRR | 110 dB minimum - suppresses supply ripple effects on output current, critical for noisy plant-floor power rails. |
| CMRR | 86 dB minimum - rejects common-mode interference from long sensor leads in factory automation environments. |
| Bridge excitation | 2.5 V or 5 V reference outputs - stable, low-drift sources for Wheatstone bridge biasing with ±0.25% initial accuracy. |
| Linearization capability | Corrects ±5% parabolic nonlinearity - enables use of cost-optimized strain gauges and pressure sensors without external compensation. |
| Supply voltage range | 7.5 V to 36 V - supports operation down to minimal loop compliance voltage while tolerating industrial brownouts. |
Pinout & Package
Package: 14-pin plastic DIP (PDIP, N package), 19.3 mm × 9.4 mm nominal footprint, rated for –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREG (Pin 1) | 5.1 V regulator output | Provides stable 5.1 V at up to 2.5 mA for external circuitry; serves as reference point for RLIN and Lin Polarity connections. |
| VIN– (Pin 2) | Differential input (inverting) | Accepts negative leg of bridge sensor; input common-mode range strictly 1.1 V to 3.5 V referenced to IRET. |
| RG (Pin 3), RG (Pin 4) | Gain-setting terminals | Resistance between pins sets transconductance: IO = VIN × (40/RG) + 4 mA; determines full-scale sensitivity. |
| VIN+ (Pin 5) | Differential input (noninverting) | Accepts positive leg of bridge sensor; matched with VIN– for high-CMRR instrumentation amplifier operation. |
| IRET (Pin 6) | Local ground return | Return path for VREG, VREF2.5, and VREF5 currents; defines reference potential for all internal voltage nodes. |
| IO (Pin 7) | Current output | Regulated 4–20 mA loop output; connects to emitter of external NPN transistor (e.g., TIP29C) for power handling. |
| E (Emitter, Pin 8) | External transistor emitter | Emitter connection for external pass transistor; forms feedback path to maintain precise current regulation. |
| B (Base, Pin 9) | External transistor base | Drives base of external NPN transistor; isolates high-power dissipation from precision analog core. |
| V+ (Pin 10) | Loop power supply | Primary power input (7.5–36 V); supplies entire device and loop load; absolute max rating is 40 V. |
| RLIN (Pin 11) | Linearization resistor node | Connects to VREG to set corrective factor for bridge nonlinearity; value determined by sensor B-term and KLIN. |
| Lin Polarity (Pin 12) | Correction polarity control | Connect to IRET for positive nonlinearity correction or to VREG for negative correction; high-impedance logic-level input. |
| VREF 2.5 (Pin 13) | 2.5 V reference output | Stable excitation source for low-voltage bridges; ±0.25% initial accuracy, ±35 ppm/°C drift over –40°C to +85°C. |
| VREF 5 (Pin 14) | 5 V reference output | Higher-voltage excitation for improved SNR in high-resistance bridges; same accuracy and drift specs as VREF2.5. |
Key Features
| Feature | Design Value |
|---|---|
| Second-order bridge linearization | Uses RLIN and Lin Polarity to modulate VREF and correct parabolic nonlinearity - achieves up to 20:1 improvement without software or external DACs. |
| Integrated dual-reference excitation | On-chip 2.5 V and 5 V references eliminate need for external voltage sources, reducing BOM count and layout complexity in field transmitters. |
| High-PSRR current regulation | 110 dB rejection of supply ripple ensures loop current stability even when powered from unregulated 24 VDC plant rails. |
| Low-drift instrumentation amplifier | 0.25 µV/°C offset drift and ±25 ppm/°C span drift enable sub-0.1% total unadjusted error in uncalibrated bridge systems. |
| External transistor interface | Dedicated B (base) and E (emitter) pins simplify thermal isolation of high-power pass transistor, preserving analog accuracy under full-load conditions. |
| Wide-loop compliance | Operates down to 7.5 V loop supply - supports legacy 12 V systems and maintains functionality during brownouts common in remote SCADA sites. |
Applications
| Pressure Transmitter | Temperature Transmitter |
|---|---|
|
Use Scenario: 4–20 mA output from a silicon piezoresistive pressure sensor in hazardous-area process control cabinets. IC Role / Device Role / Timing Role: XTR106P conditions the mV-level bridge output, provides 5 V excitation, applies second-order linearization, and delivers loop-powered current proportional to pressure. Use Value: Eliminates need for separate excitation, amplification, and linearization stages - reduces calibration labor and improves long-term stability in oil & gas flow meters. |
Use Scenario: RTD-based temperature sensing in HVAC chillers with 2-wire loop wiring and HART communication overlay. IC Role / Device Role / Timing Role: XTR106P interfaces with 3-wire RTD bridge, uses 2.5 V excitation to limit self-heating, and delivers linearized 4–20 mA output compatible with HART modems. Use Value: Enables direct replacement of legacy analog transmitters without changing field wiring or control system I/O modules. |
| Weighing System | Strain Gauge Transmitter |
|
Use Scenario: Platform scale in food processing plants requiring high linearity and immunity to 50/60 Hz EMI from nearby motors. IC Role / Device Role / Timing Role: XTR106P amplifies microvolt-level signals from load cell bridges, rejects common-mode noise via 86 dB CMRR, and outputs calibrated current. Use Value: Achieves ±0.01% FS linearity after linearization - meets OIML R76 Class III accuracy requirements without factory trimming. |
Use Scenario: Structural health monitoring of bridges using bonded foil strain gauges exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: XTR106P provides temperature-stable 5 V excitation, compensates for gauge nonlinearity, and maintains 4–20 mA output across –40°C to +85°C. Use Value: Compensates for parabolic nonlinearity inherent in low-cost foil gauges - extends usable measurement range by 2× compared to uncompensated designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4–20 mA bridge transmitter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| XTR105UA | Single 5 V reference only; no 2.5 V option; lacks RLIN/Lin Polarity linearization circuitry; ±50 µA zero error vs XTR106P's ±25 µA. | Targeted at simpler, lower-cost transmitters where bridge nonlinearity <±0.5% and no dual-reference flexibility is needed. | Select XTR105UA only if linearization is unnecessary and 2.5 V excitation is not required - saves board space but sacrifices correction capability. |
| XTR115UA | Includes integrated 40 V protection Zener; higher 125°C max ambient rating; identical linearization and reference architecture; ±0.1% unadjusted error spec. | Designed for harsher environments (e.g., engine compartments, outdoor substations) where overvoltage surge immunity and extended temperature are mandatory. | Choose XTR115UA when field wiring is exposed to lightning-induced surges or ambient exceeds +85°C - adds robustness without redesigning linearization network. |
Compared with XTR105UA, XTR106P adds essential 2.5 V excitation and hardware linearization for cost-optimized bridges; compared with XTR115UA, it trades surge protection for lower cost and standard industrial temperature grade - making XTR106P optimal for calibrated factory-assembled transmitters in controlled environments.
Availability
XTR106P is available at Aetrix Electronics and suitable for industrial process control, factory automation, and SCADA remote data acquisition requiring stable component supply and long-term manufacturability.
Supply support for XTR106P 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 leadership in precision signal conditioning and industrial interface ICs.
The XTR106P belongs to TI's XTR (transmitter) product line, engineered specifically for 2-wire, loop-powered industrial sensor signal conditioning - emphasizing low drift, integrated excitation, and hardware-based linearization for bridge-based measurement systems.
FAQ
What is the primary function of the XTR106P in a 4–20 mA transmitter design?
The XTR106P serves as a complete analog front-end for bridge sensors, integrating differential instrumentation amplification, selectable 2.5 V or 5 V bridge excitation, second-order hardware linearization, and regulated 4–20 mA current output. Unlike discrete solutions, the XTR106P eliminates the need for external op-amps, references, and linearization DACs - enabling compact, high-accuracy field transmitter designs that meet IEC 61000-4 immunity requirements without additional filtering.
How does the XTR106P achieve bridge nonlinearity correction without software or microcontrollers?
The XTR106P performs analog second-order correction by dynamically modulating its VREF2.5 or VREF5 output voltage in response to the input signal, using an external resistor (RLIN) and polarity-select pin (Lin Polarity). This creates a signal-dependent excitation that introduces a counteracting parabolic term into the overall transfer function - correcting up to ±5% sensor nonlinearity in real time, with no firmware, calibration tables, or digital processing required.
Can the XTR106P operate with a 12 V loop supply, and what is its minimum compliance voltage?
Yes, the XTR106P operates reliably with a 12 V loop supply. Its absolute minimum compliance voltage is 7.5 V - meaning it can sustain full 20 mA output with as little as 7.5 V across V+ and IO pins. This allows deployment in legacy 12 V systems and battery-backed installations where voltage sag must be accommodated without output dropout or nonlinearity degradation.
What external components are mandatory for basic XTR106P operation?
Four external components are mandatory: (1) RG resistor between pins 3 and 4 to set gain, (2) RLIN resistor between pins 1 and 11 for linearization, (3) external NPN transistor (e.g., TIP29C) connected to pins 7 (IO), 8 (E), and 9 (B), and (4) 0.01–0.03 µF bypass capacitor between V+ and IO. Optional but recommended: input filter capacitor for high-Z bridges and Zener clamp for surge protection.
Is the XTR106P pin-compatible with other devices in the XTR family, such as the XTR105 or XTR115?
No, the XTR106P is not pin-compatible with the XTR105 or XTR115. While all three share the 14-pin DIP/SOIC footprint, their pin functions differ significantly - for example, XTR105 lacks RLIN and Lin Polarity pins, and XTR115 repurposes several pins for integrated protection circuitry. PCB layout must be designed specifically for the XTR106P pinout; direct substitution requires board revision.
XTR106P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Current Transmitter
- Input Type:
- Differential
- Output Type:
- Voltage
- Current - Supply:
- 20 mA
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
XTR106P FAQ
1.How can I place an order for XTR106P through Aetrix?
Please submit a Request for Quotation (RFQ) for XTR106P 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 XTR106P reliable?
The price and inventory of XTR106P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for XTR106P is usually 5 days.
3.What payment methods are accepted for XTR106P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for XTR106P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for XTR106P?
XTR106P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your XTR106P 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 XTR106P?
For technical support, including XTR106P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your XTR106P requirements.
6.How does Aetrix verify that XTR106P is sourced from the original manufacturer or authorized distributors?
All XTR106P 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 XTR106P meets industry standards.
7.What is the process for return or replacement of XTR106P?
All XTR106P units undergo pre-shipment inspection (PSI). If there is an issue with XTR106P, 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 XTR106P part is unused and in its original packaging.
Return procedure for XTR106P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
XTR106P Tags
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RE46C100S8TF
Microchip Technology
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XTR117AIDGKR
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MAX14626ETT+T
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