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Texas Instruments OPA140AIDGKR
- Part No.:
- OPA140AIDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA140AIDGKR.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,731
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Product details
Overview
OPA140AIDGKR from Texas Instruments is a single-channel, rail-to-rail output, JFET-input operational amplifier optimized for precision DC and low-frequency AC signal conditioning. It delivers 11-MHz unity-gain bandwidth, 20 V/μs slew rate, ±120 μV max input offset voltage, and 5.1 nV/√Hz input voltage noise density at 1 kHz - enabling high-accuracy sensor interfacing and data acquisition in industrial instrumentation and metrology systems.
For engineers reviewing the OPA140AIDGKR datasheet, OPA140AIDGKR pinout, OPA140AIDGKR application, or OPA140AIDGKR equivalent, key selection criteria include its 1 μV/°C max offset drift, 10 pA max input bias current, rail-to-rail output swing, no phase reversal behavior, and operation from ±2.25 V to ±18 V dual supply or 4.5 V to 36 V single supply.
Technical Context
The OPA140AIDGKR implements a JFET-input front-end with complementary differential pair architecture, delivering ultra-low input bias current and excellent common-mode rejection (140 dB typical). Its internal compensation ensures stable unity-gain operation while supporting fast settling (1.6 μs for 16-bit) and overload recovery (600 ns).
Designed for precision analog signal chains, it features input voltage range extending to V–, rail-to-rail output swing, and robust ESD protection (±2000 V HBM). All electrical specifications are fully characterized from –40°C to +125°C, confirming suitability for harsh industrial and test equipment environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 11 MHz - supports stable closed-loop gain ≥1 with bandwidth up to 11 MHz for high-fidelity signal amplification. |
| Slew Rate | 20 V/μs - enables accurate reproduction of fast-rising signals without distortion in precision DAC output buffers. |
| Input Offset Voltage | ±120 μV max - minimizes DC error in high-gain transducer interfaces and reference buffer circuits. |
| Offset Drift | ±1 μV/°C max - ensures long-term stability in uncalibrated temperature-varying systems like lab instrumentation. |
| Input Bias Current | ±10 pA max - preserves signal integrity when driving high-impedance sources such as piezoelectric sensors or pH electrodes. |
| 0.1–10 Hz Noise | 250 nVPP - critical for low-frequency measurements in gas analyzers and strain gauge bridges where 1/f noise dominates. |
| Supply Range | ±2.25 V to ±18 V dual or 4.5 V to 36 V single - allows flexible integration into both legacy bipolar and modern wide-range industrial power rails. |
Pinout & Package
The OPA140AIDGKR is housed in an 8-pin VSSOP (DGK) package - a space-efficient, surface-mount outline measuring 2.3 mm × 2.0 mm with 0.5 mm lead pitch, optimized for high-density PCB layouts in portable test gear and modular DAQ systems.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection; must be left floating or grounded per layout best practice - no functional impact. |
| 2 | –IN | Inverting input terminal - accepts feedback network or signal inversion path; high-impedance JFET node. |
| 3 | +IN | Noninverting input terminal - connects to high-Z sensor outputs or reference voltages without loading. |
| 4 | V– | Negative supply rail - also internally connected to thermal pad in compatible packages; must be solidly decoupled. |
| 5 | NC | No internal connection - electrically isolated; no routing or termination required. |
| 6 | OUT | Amplified output - rail-to-rail capable; drives ADC inputs, active filters, or low-impedance loads up to 2 kΩ. |
| 7 | V+ | Positive supply rail - supplies core amplifier and output stage; requires local 0.1 μF ceramic decoupling. |
| 8 | NC | No internal connection - unused pin; no electrical function or thermal role in DGK package. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Guaranteed under overdrive or common-mode excursion beyond rails - eliminates latch-up risk in fault-tolerant sensor front-ends. |
| Rail-to-rail output | Swings within 350 mV of either rail at 2 kΩ load - maximizes dynamic range when interfacing with 16-bit SAR ADCs. |
| Input range includes V– | Accepts signals down to V– – 0.1 V - enables true single-supply operation with ground-referenced sensors. |
| Low 1/f noise | 250 nVPP (0.1–10 Hz) - reduces baseline drift in DC-coupled chemical analyzer front-ends and thermopile amplifiers. |
| High CMRR | 140 dB typical - rejects power supply ripple and EMI in noisy industrial environments without external filtering. |
Applications
| Chemistry Analyzer Front-End | Data Acquisition Signal Chain |
|---|---|
Use Scenario: Amplifying low-level current output from electrochemical sensors (e.g., dissolved oxygen, pH) with minimal added noise and drift. IC Role / Device Role / Timing Role: Precision transimpedance amplifier and DC-coupled buffer preceding a 24-bit delta-sigma ADC. Use Value: 10 pA input bias current prevents sensor polarization; 250 nVPP 0.1–10 Hz noise preserves resolution in sub-ppm gas concentration measurements. |
Use Scenario: Conditioning analog outputs from strain gauges, RTDs, and thermocouples in modular industrial DAQ modules. IC Role / Device Role / Timing Role: Low-drift instrumentation amplifier driver with rail-to-rail output for ADC input scaling. Use Value: ±1 μV/°C offset drift maintains calibration stability across –40°C to +85°C operating range without periodic recalibration. |
| DC Power Supply Monitor | Lab Instrumentation Reference Buffer |
Use Scenario: High-accuracy sensing of output voltage and current in programmable bench power supplies and electronic loads. IC Role / Device Role / Timing Role: Precision difference amplifier for shunt-based current measurement and divider-based voltage monitoring. Use Value: 140 dB CMRR rejects switching noise from PWM control stages; ±120 μV offset ensures <0.01% full-scale error at 30 V range. |
Use Scenario: Buffering precision voltage references (e.g., LTZ1000, REF50xx) in calibrators and metrology-grade multimeters. IC Role / Device Role / Timing Role: Low-noise, low-drift unity-gain buffer isolating reference from load variations and PCB leakage. Use Value: 5.1 nV/√Hz noise floor avoids degrading reference spectral purity; rail-to-rail output accommodates 0–10 V reference scaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision JFET op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA141AIDGKR | Higher 18-MHz GBW, 27 V/μs slew rate, but 250 μV max VOS and 2.5 μV/°C max drift - trades DC precision for speed. | Better suited for higher-bandwidth active filters or fast-settling DAC buffers where drift tolerance >1 μV/°C is acceptable. | Select OPA141AIDGKR only if bandwidth >11 MHz is mandatory and DC accuracy requirements are relaxed. |
| ADA4625-1ACPZ-R7 | Lower 1.8 nV/√Hz noise at 1 kHz, 0.3 μV/°C max drift, but 5.5 V to 36 V single-supply only - no dual-supply support. | Ideal for battery-powered portable instruments requiring lowest possible noise and drift, but incompatible with ±15 V legacy systems. | Choose ADA4625-1ACPZ-R7 when ultra-low noise and drift outweigh need for dual-supply flexibility. |
Compared with OPA140AIDGKR, OPA141AIDGKR offers higher speed at the cost of DC precision, while ADA4625-1ACPZ-R7 delivers superior noise and drift performance but lacks dual-supply capability - making OPA140AIDGKR the balanced choice for general-purpose industrial precision amplification.
Availability
OPA140AIDGKR is available at Aetrix Electronics and suitable for chemistry analyzers, industrial DAQ systems, and DC power supply monitors requiring stable component supply, long-term calibration integrity, and extended temperature operation.
Supply support for OPA140AIDGKR 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 heritage in precision op amp design and manufacturing excellence.
The OPAx140 family was engineered specifically for high-accuracy, low-drift signal conditioning in demanding industrial test, measurement, and process control applications - prioritizing DC precision, noise performance, and robustness over raw speed.
FAQ
What is the maximum capacitive load the OPA140AIDGKR can drive stably?
The OPA140AIDGKR remains stable with up to ~100 pF capacitive load in unity-gain configuration when ROUT = 0 Ω, but overshoot increases above 50 pF. For loads >100 pF, a series isolation resistor (e.g., 50 Ω) between OUT and CL is required to maintain phase margin. Figure 6-19 in the datasheet quantifies overshoot vs. load for various ROUT values - confirming OPA140AIDGKR's suitability for driving ADC input capacitance and long cables when properly buffered.
Does the OPA140AIDGKR support true single-supply operation with input signals at ground potential?
Yes. The OPA140AIDGKR features an input common-mode range that extends to V– (including ground in single-supply configurations), allowing direct interface with ground-referenced sensors like thermistors or bridge transducers. Its rail-to-rail output further enables full utilization of the ADC input range - a key enabler for OPA140AIDGKR in 3.3 V or 5 V microcontroller-based DAQ designs.
How does the OPA140AIDGKR's 0.1–10 Hz noise compare to competing precision op amps?
At 250 nVPP (0.1–10 Hz), the OPA140AIDGKR matches industry-leading low-frequency noise performance - identical to the OPA141 and superior to older precision JFET op amps like the TL071 (600 nVPP). This value is measured under standardized conditions (VS = ±18 V, RL = 2 kΩ) and directly enables sub-microvolt resolution in DC-coupled applications such as gas chromatography detectors and precision weight scales using OPA140AIDGKR.
Is the OPA140AIDGKR pin-compatible with other members of the OPAx140 family?
No. The OPA140AIDGKR (single, 8-pin VSSOP) shares pinout with the OPA2140 (dual) and OPA4140 (quad) in SOIC and VSSOP packages, but not with the 5-pin SOT-23 variant (OPA140DBVR). Pin functions differ between DBV and DGK packages - e.g., +IN is pin 3 in DGK but pin 3 in DBV; V– is pin 4 in DGK but pin 2 in DBV. Layout reuse requires verifying package-specific pin mapping for OPA140AIDGKR.
What thermal considerations apply to the OPA140AIDGKR in the DGK package?
The OPA140AIDGKR in DGK package has RθJA = 180°C/W (JEDEC high-K board), meaning 1.8 mA quiescent current (36 mW dissipation) yields ~6.5°C junction rise above ambient at TA = 85°C. No thermal pad is present in DGK - unlike SON packages - so heatsinking relies solely on copper pour under pins 4 (V–) and 7 (V+). Derating is recommended above 85°C ambient per Section 6.4 of the datasheet to ensure OPA140AIDGKR reliability.
OPA140AIDGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- 11 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.5 pA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 1.8mA
- Current - Output / Channel:
- 36 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
OPA140AIDGKR FAQ
1.How can I place an order for OPA140AIDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA140AIDGKR 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 OPA140AIDGKR reliable?
The price and inventory of OPA140AIDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA140AIDGKR is usually 5 days.
3.What payment methods are accepted for OPA140AIDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA140AIDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA140AIDGKR?
OPA140AIDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA140AIDGKR 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 OPA140AIDGKR?
For technical support, including OPA140AIDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA140AIDGKR requirements.
6.How does Aetrix verify that OPA140AIDGKR is sourced from the original manufacturer or authorized distributors?
All OPA140AIDGKR 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 OPA140AIDGKR meets industry standards.
7.What is the process for return or replacement of OPA140AIDGKR?
All OPA140AIDGKR units undergo pre-shipment inspection (PSI). If there is an issue with OPA140AIDGKR, 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 OPA140AIDGKR part is unused and in its original packaging.
Return procedure for OPA140AIDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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