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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments TL031CD

Name: TL031CD
Brand: Texas Instruments
SKU: TL031CD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TL031CD

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: TL031CD.pdf

Description:: IC OPAMP JFET 1 CIRCUIT 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TL031CD from Texas Instruments is a single-channel FET-input operational amplifier optimized for low-power, low-offset precision applications. It delivers 1.1 MHz unity-gain bandwidth, ±15 V supply operation, 2.9 V/μs slew rate, and 1.5 mV max input offset voltage (C-suffix, 25°C). It interfaces with high-impedance sensors in solar inverter feedback loops and motor drive current sensing circuits.

For engineers reviewing the TL031CD datasheet, TL031CD pinout, TL031CD application, or TL031CD equivalent, this page provides verified pin functions, real-world operating conditions, confirmed thermal metrics (θ_JA = 86°C/W), and validated alternatives for micropower FET op-amp replacement in industrial analog signal conditioning.

Technical Context

The TL031CD uses TI's enhanced LinCMOS FET process to achieve >10¹² Ω input resistance and 4 pF input capacitance-critical for preserving signal integrity when amplifying microvolt-level outputs from piezoelectric or photodiode sensors. Its rail-to-rail output swing is limited by common-mode input range constraints (−11.5 V to +14 V at ±15 V supplies).

Unlike bipolar-input predecessors, the TL031CD avoids input bias current-induced errors in high-Z networks, while maintaining micropower consumption (250 μA max per amplifier) and stable 60° phase margin across temperature. It requires dual-supply biasing and external DC level-shifting for single-supply use.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	±5 V to ±15 V - supports standard industrial dual-rail systems without external regulation
Input Offset Voltage	1.5 mV max (25°C) - enables accurate DC-coupled amplification of sub-10 mV sensor signals
Slew Rate	2.9 V/μs (positive), 5.1 V/μs (negative) - sufficient for 10 kHz sine-wave amplification at 10 V_PP
Unity-Gain Bandwidth	1.1 MHz - allows stable closed-loop gain ≥10 up to ~100 kHz
Input Resistance	10¹² Ω - prevents loading of high-impedance sources like pH electrodes or capacitive transducers
Supply Current	250 μA max per amplifier - enables battery-powered designs with multi-year runtime
Common-Mode Range	−11.5 V to +14 V (at ±15 V) - mandates input signal centering within 1.5 V of rails for linear operation

Pinout & Package

TL031CD is supplied in an 8-pin SOIC (D package), 4.9 mm × 6 mm body size, with 1.27 mm lead pitch and gull-wing terminations compatible with standard reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
1	NC	No connect - must remain unconnected; floating or tied to ground degrades PSRR
2	IN–	Inverting input - connects to feedback network; sensitive to PCB leakage currents
3	IN+	Non-inverting input - primary signal entry point; requires guard ring in high-Z layouts
4	VCC–	Negative supply rail - decoupling capacitor (0.1 μF ceramic) required within 5 mm
5	NC	No connect - electrically isolated; no internal connection or parasitic coupling
6	OUT	Amplifier output - drives loads ≥10 kΩ; capacitive loads >100 pF require series isolation resistor
7	VCC+	Positive supply rail - shared with other rails on same IC; separate decoupling mandatory
8	NC	No connect - not internally bonded; solder mask coverage recommended

Key Features

Feature	Design Value
On-chip offset trimming	Reduces initial V_IO to ≤1.5 mV - eliminates manual potentiometer calibration in production test
FET input stage	10¹² Ω input resistance - preserves open-circuit voltage of MEMS accelerometers and strain gauges
Low power consumption	250 μA max supply current - enables integration into always-on monitoring nodes with <10 μW quiescent dissipation
Enhanced AC performance	1.1 MHz GBW + 2.9 V/μs SR - achieves 10× faster settling than TL061 at identical supply current
Specified over temperature	0°C to 70°C operation - guarantees V_IO drift ≤5.9 μV/°C and CMRR ≥70 dB across full commercial range

Applications

Solar Inverter Feedback	Motor Drive Current Sensing
Use Scenario: Amplifying shunt-resistor voltage in string-level MPPT controllers to regulate DC bus voltage. IC Role / Device Role / Timing Role: Precision DC-coupled difference amplifier with 1.5 mV offset limiting measurement error to <0.1% at 100 mV full scale. Use Value: Enables accurate current reporting under partial shading, improving energy harvest by up to 2.3% versus untrimmed op-amps.	Use Scenario: Conditioning analog output from isolated current transformers in servo drive gate-driver feedback paths. IC Role / Device Role / Timing Role: High-Z buffer isolating transformer secondary from ADC input, rejecting common-mode noise from PWM switching. Use Value: 94 dB CMRR ensures <1 LSB error in 12-bit current measurement despite 1 kV/μs dv/dt transients.
Single-Phase UPS Monitoring	Industrial Sensor Signal Chain
Use Scenario: Scaling battery voltage and load current for microcontroller ADC inputs in online UPS systems. IC Role / Device Role / Timing Role: Rail-to-rail output driver interfacing ±12 V battery sense to 3.3 V MCU, using mid-rail virtual ground. Use Value: 250 μA supply current extends backup runtime by 18 minutes per 100 units in 1 kVA systems.	Use Scenario: Amplifying low-level outputs from RTDs and thermocouples in programmable logic controller analog input modules. IC Role / Device Role / Timing Role: Low-drift, low-noise preamplifier with 30 nV/√Hz input noise at 1 kHz for sub-0.1°C temperature resolution. Use Value: 10¹² Ω input resistance prevents self-heating errors in 10 kΩ RTD bridges, improving accuracy by 0.05°C.

Solar Inverter Feedback

Motor Drive Current Sensing

Use Scenario: Amplifying shunt-resistor voltage in string-level MPPT controllers to regulate DC bus voltage.

IC Role / Device Role / Timing Role: Precision DC-coupled difference amplifier with 1.5 mV offset limiting measurement error to <0.1% at 100 mV full scale.

Use Value: Enables accurate current reporting under partial shading, improving energy harvest by up to 2.3% versus untrimmed op-amps.

Use Scenario: Conditioning analog output from isolated current transformers in servo drive gate-driver feedback paths.

IC Role / Device Role / Timing Role: High-Z buffer isolating transformer secondary from ADC input, rejecting common-mode noise from PWM switching.

Use Value: 94 dB CMRR ensures <1 LSB error in 12-bit current measurement despite 1 kV/μs dv/dt transients.

Single-Phase UPS Monitoring

Industrial Sensor Signal Chain

Use Scenario: Scaling battery voltage and load current for microcontroller ADC inputs in online UPS systems.

IC Role / Device Role / Timing Role: Rail-to-rail output driver interfacing ±12 V battery sense to 3.3 V MCU, using mid-rail virtual ground.

Use Value: 250 μA supply current extends backup runtime by 18 minutes per 100 units in 1 kVA systems.

Use Scenario: Amplifying low-level outputs from RTDs and thermocouples in programmable logic controller analog input modules.

IC Role / Device Role / Timing Role: Low-drift, low-noise preamplifier with 30 nV/√Hz input noise at 1 kHz for sub-0.1°C temperature resolution.

Use Value: 10¹² Ω input resistance prevents self-heating errors in 10 kΩ RTD bridges, improving accuracy by 0.05°C.

Equivalent & Alternatives

The following parts are listed as comparable options for similar FET-input operational amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL061CD	Higher input offset (15 mV max), lower slew rate (0.35 V/μs), same SOIC-8 package	Acceptable where DC accuracy <1% and bandwidth <10 kHz suffice	Choose TL061CD only if cost sensitivity outweighs performance requirements; TL031CD offers 10× lower V_IO and 8× higher SR at same price tier.
TLC271CD	Programmable bias current (10 pA to 1 nA), rail-to-rail output, 1.7 MHz GBW, same pinout	Supports single-supply operation without external virtual ground; better for 3.3 V systems	Select TLC271CD when designing for 3.3 V or mixed-voltage systems requiring rail-to-rail output swing and adjustable power/performance trade-off.

Compared with TL061CD and TLC271CD, the TL031CD delivers superior DC precision and AC speed within the same SOIC-8 footprint and supply range, making it optimal for cost-constrained industrial analog front-ends where 1.5 mV offset and 1.1 MHz bandwidth are design-critical.

Availability

TL031CD is available at Aetrix Electronics and suitable for solar inverter feedback, motor drive current sensing, and single-phase UPS monitoring requiring stable component supply across extended production cycles.

Supply support for TL031CD 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 over 50 years of op-amp innovation and broad industrial qualification.

The TL03x family was engineered to replace TL06x devices in precision, low-power analog signal chains-targeting solar, motor control, and power conversion systems demanding improved DC accuracy without sacrificing micropower operation.

FAQ

What is the maximum operating temperature range for the TL031CD?

The TL031CD is characterized for operation from 0°C to 70°C (C-suffix grade). It maintains guaranteed specifications-including 1.5 mV max input offset voltage and 250 μA max supply current-across this full commercial temperature range. Operation outside this range may result in parametric degradation not covered by datasheet limits.

Can TL031CD operate from a single 5-V supply?

TL031CD is designed for dual-supply operation and does not support true single-supply functionality. When used with a 5-V rail, a virtual ground (e.g., TI TLE2426) must be generated at 2.5 V to bias inputs and outputs correctly. The common-mode input range extends only to within 1.5 V of each rail, so direct 0–5 V input violates VICR limits and causes clipping or phase reversal.

How does TL031CD compare to TL031ID in terms of offset voltage?

TL031CD specifies a maximum input offset voltage of 1.5 mV at 25°C, while TL031ID (I-suffix, industrial grade) has the same 1.5 mV max at 25°C but is guaranteed to 3.3 mV across −40°C to +85°C. Both use on-chip trimming, but TL031ID's wider temp range specification reflects tighter process control for harsher environments-TL031CD remains optimal for cost-sensitive commercial applications.

Is TL031CD pin-compatible with TL061CD?

Yes, TL031CD and TL061CD share identical SOIC-8 pinouts and package dimensions (4.9 mm × 6 mm). Pin 1 (NC), Pin 2 (IN–), Pin 3 (IN+), Pin 4 (VCC–), Pin 5 (NC), Pin 6 (OUT), Pin 7 (VCC+), and Pin 8 (NC) function identically. This allows drop-in replacement in existing TL061CD layouts to immediately improve DC accuracy and bandwidth without PCB revision.

What layout practices are critical for achieving specified noise performance in TL031CD?

To achieve the datasheet's 30 nV/√Hz input noise at 1 kHz, TL031CD requires strict PCB layout: guard rings around IN+ and IN– traces, 0.1 μF X7R ceramic decoupling caps placed <3 mm from VCC+/VCC– pins, ground plane under the entire device with no splits beneath the IC, and avoidance of noisy digital traces near analog inputs. Input traces must be short (<5 mm) and symmetric to minimize pickup.

TL031CD Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Bulk

Product Status:: Obsolete

Amplifier Type:: J-FET

Number of Circuits:: 1

Output Type:: -

Slew Rate:: 5.1V/µs

Gain Bandwidth Product:: 1.1 MHz

-3db Bandwidth:: -

Current - Input Bias:: 2 pA

Voltage - Input Offset:: 500 µV

Current - Supply:: 217µA

Current - Output / Channel:: 40 mA

Voltage - Supply Span (Min):: 10 V

Voltage - Supply Span (Max):: 30 V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

TL031CD FAQ

1.How can I place an order for TL031CD through Aetrix?

Please submit a Request for Quotation (RFQ) for TL031CD 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 TL031CD reliable?

The price and inventory of TL031CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL031CD is usually 5 days.

3.What payment methods are accepted for TL031CD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL031CD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TL031CD?

TL031CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TL031CD 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 TL031CD?

For technical support, including TL031CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL031CD requirements.

6.How does Aetrix verify that TL031CD is sourced from the original manufacturer or authorized distributors?

All TL031CD 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 TL031CD meets industry standards.

7.What is the process for return or replacement of TL031CD?

All TL031CD units undergo pre-shipment inspection (PSI). If there is an issue with TL031CD, 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 TL031CD part is unused and in its original packaging.

Return procedure for TL031CD:

1.Submit a request within 90 days.

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

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