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Texas Instruments OPA188AIDGKR
- Part No.:
- OPA188AIDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA188AIDGKR.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1CIRC 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,182
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Product details
Overview
OPA188AIDGKR from Texas Instruments is a precision zero-drift operational amplifier in an 8-pin MSOP package, delivering 25 µV max input offset voltage, 0.085 µV/°C drift, and 2 MHz gain bandwidth. It operates from ±2 V to ±18 V, features rail-to-rail output swing within 15 mV of rails, and supports analog input modules and weight-scale front-ends requiring stable DC accuracy.
For engineers reviewing the OPA188AIDGKR datasheet, OPA188AIDGKR pinout, OPA188AIDGKR application, or OPA188AIDGKR equivalent, key selection criteria include its ultra-low drift architecture, RFI-filtered inputs, −40°C to +125°C operation, and compatibility with high-precision sensor signal conditioning where long-term offset stability is critical.
Technical Context
The OPA188AIDGKR implements TI's proprietary auto-zeroing architecture with periodic calibration, eliminating 1/f noise and enabling near-zero drift over temperature and time. Its input stage includes negative-rail capability and RFI filtering, while the output delivers rail-to-rail swing with 0.8 V/µs slew rate and 20 µs 0.1% settling for 10-V steps.
This device uses a dual-stage chopper-stabilized design (GM1/GM2/GM3 with notch filter and CHOP1/CHOP2) to achieve 146 dB CMRR and 142 dB PSRR at DC, supporting high-accuracy closed-loop configurations in noisy industrial environments without external trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 25 µV maximum - ensures ≤0.001% error in 2.5 V full-scale 16-bit DAQ systems without calibration |
| Drift vs Temp | 0.085 µV/°C maximum - contributes <1 µV total drift across −40°C to +125°C operating range |
| Noise (0.1–10 Hz) | 0.25 µVPP - enables sub-µV resolution in low-frequency sensor amplification (e.g., strain gauges) |
| Gain Bandwidth | 2 MHz - supports stable unity-gain operation and closed-loop bandwidth up to 1.5 MHz with 45° phase margin |
| Supply Range | ±2 V to ±18 V - compatible with both low-voltage portable systems and high-voltage industrial power rails |
| Quiescent Current | 510 µA maximum - allows battery-powered precision instrumentation with multi-year runtime |
| CMRR | 146 dB - rejects >200 V common-mode interference on 10 mV differential signals |
Pinout & Package
The OPA188AIDGKR is housed in an 8-pin MSOP (DGK) package measuring 3.00 mm × 3.00 mm, with exposed pad for thermal enhancement and surface-mount compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 3) | Noninverting input | High-impedance node (10¹² Ω || 9.5 pF) accepting signals down to negative rail; requires matched layout to minimize thermoelectric offset |
| −IN (Pin 2) | Inverting input | Differential input node; paired with +IN for precision feedback networks; sensitive to PCB trace asymmetry |
| OUT (Pin 6) | Amplifier output | Rail-to-rail capable (within 15 mV of rails, no load); drives ≥10 kΩ loads with <0.0001% THD+N at 1 kHz |
| V+ (Pin 7) | Positive supply | Accepts up to +18 V; requires local 0.1 µF ceramic decoupling to suppress supply-induced errors |
| V− (Pin 4) | Negative supply | Accepts down to −18 V; enables true bipolar operation and negative-rail input common-mode range |
| NC (Pins 1, 5, 8) | No connection | Internally unconnected; must be left floating-no routing or grounding permitted per TI design guidance |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift auto-zeroing | Eliminates 1/f noise and reduces long-term drift to ≤4 µV over 1000 hours at 125°C |
| Rail-to-rail output | Swings within 15 mV of supply rails under no load, preserving dynamic range in low-headroom systems |
| RFI-filtered inputs | Integrated EMI rejection circuitry provides >60 dB attenuation at 900 MHz, preventing RF rectification errors |
| Phase-reversal protection | Prevents output inversion when input exceeds common-mode range-critical for noninverting sensor interfaces |
| Wide temperature range | Specified from −40°C to +125°C with full parametric performance, enabling under-hood and industrial deployment |
Applications
| Weight Scale Front-End | Analog Input Module |
|---|---|
Use Scenario: Amplifies microvolt-level bridge outputs from load cells in commercial and industrial weighing systems. IC Role / Device Role / Timing Role: Precision instrumentation amplifier core with programmable gain, rejecting common-mode noise from AC mains and motors. Use Value: 0.085 µV/°C drift ensures ≤2 µV offset shift over 50°C ambient change-enabling Class III legal-for-trade accuracy without recalibration. | Use Scenario: Signal conditioning stage in PLC analog input cards handling 4–20 mA, ±10 V, and thermocouple inputs. IC Role / Device Role / Timing Role: High-CMRR buffer and level-shifter interfacing field sensors to SAR ADCs with 16+ ENOB. Use Value: 146 dB CMRR rejects >200 V common-mode transients induced by motor drives, maintaining measurement integrity in factory floors. |
| Flow Transmitter | Battery Test System |
Use Scenario: Amplifies low-level voltage from Coriolis or magnetic flow sensor coils in custody-transfer metering. IC Role / Device Role / Timing Role: Low-noise, low-drift gain stage preceding isolation and digitization, operating continuously at elevated temperatures. Use Value: 0.25 µVPP 0.1–10 Hz noise enables detection of <0.1% flow rate changes in 24-bit systems, meeting API RP 1171 requirements. | Use Scenario: Precision current-sense amplifier in automated battery formation and grading equipment for Li-ion cells. IC Role / Device Role / Timing Role: High-accuracy shunt-based current monitor with bidirectional capability and fast overload recovery (1 µs). Use Value: 25 µV max offset ensures ≤0.05% full-scale error at 100 A sense range, critical for capacity validation within ±0.1% tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2188AIDR | Dual-channel version in SOIC-8; identical specs per channel but higher quiescent current (540 µA/channel) | Preferred for space-constrained dual-sensor systems (e.g., differential pressure + temperature) where board area favors single-package integration | Select when needing two matched amplifiers with shared thermal environment and reduced component count |
| LTC2057HMS8#PBF | Higher 0.03 µV/°C max drift, 1.2 MHz GBW, and 1.5 µV max offset-but 850 µA IQ and no RFI filtering | Better for ultra-low-drift lab-grade instruments where power is not constrained and EMI is controlled | Choose only if drift specification is primary constraint and system-level RFI immunity is managed externally |
Compared with OPA2188AIDR and LTC2057HMS8#PBF, the OPA188AIDGKR offers optimal balance of ultra-low drift, industry-leading 146 dB CMRR, integrated RFI filtering, and 510 µA quiescent current-making it the preferred choice for cost-sensitive, high-reliability industrial signal chains.
Availability
OPA188AIDGKR is available at Aetrix Electronics and suitable for weight scale front-ends, analog input modules, and flow transmitter designs requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for OPA188AIDGKR 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 innovation in precision amplifiers and signal-chain solutions.
The OPA188AIDGKR belongs to TI's zero-drift operational amplifier product line, engineered specifically for high-accuracy industrial, test-and-measurement, and sensor interface applications demanding long-term DC stability without manual calibration.
FAQ
What is the maximum operating temperature range for the OPA188AIDGKR?
The OPA188AIDGKR is fully specified from −40°C to +125°C ambient temperature, with all key parameters-including offset voltage drift, CMRR, and open-loop gain-guaranteed across this range. This makes the OPA188AIDGKR suitable for under-hood automotive subsystems, industrial motor controls, and outdoor instrumentation where thermal extremes are routine. The device's thermal metrics (e.g., RθJA = 180.4°C/W for DGK package) support reliable operation within these limits when proper PCB copper pour and airflow are applied.
Does the OPA188AIDGKR require external offset nulling or trimming?
No, the OPA188AIDGKR does not require external offset nulling or trimming. Its proprietary auto-zeroing architecture achieves 25 µV maximum input offset voltage and 0.085 µV/°C maximum drift without laser trimming or external components. The internal zero-drift calibration occurs periodically during normal operation, ensuring continuous DC accuracy over time and temperature. This eliminates manufacturing calibration steps and field recalibration needs-reducing system cost and complexity in applications like weigh scales and data acquisition systems using the OPA188AIDGKR.
Can the OPA188AIDGKR drive capacitive loads, and what is its recommended compensation?
The OPA188AIDGKR is specified to drive up to 1 nF capacitive loads without oscillation, but stability degrades above ~100 pF without isolation. For loads >100 pF, TI recommends adding a series resistor (RISO) between the output and the capacitor-typically 25 Ω to 50 Ω-to isolate the amplifier from the reactive load. This preserves phase margin and prevents overshoot, as verified in Figure 24 and Figure 25 of the OPA188AIDGKR datasheet. Layout best practices (short traces, ground plane, local decoupling) remain essential when using the OPA188AIDGKR in capacitive-load applications.
How does the RFI filtering in the OPA188AIDGKR improve system-level EMC performance?
The OPA188AIDGKR integrates RFI filtering on both inputs, providing >60 dB attenuation at 900 MHz and demonstrated immunity to cellular and ISM-band interference. This prevents RF rectification at the input stage-which would otherwise manifest as DC offset shifts or low-frequency noise-without requiring external RC filters that degrade bandwidth or add component count. In real-world deployments such as factory-floor analog input modules, this built-in filtering allows the OPA188AIDGKR to maintain specified 0.25 µVPP noise and 146 dB CMRR even near variable-frequency drives or wireless transmitters, directly enhancing system-level EMC robustness.
Is the OPA188AIDGKR pin-compatible with other TI zero-drift op-amps like the OPA333 or OPA2378?
No, the OPA188AIDGKR is not pin-compatible with the OPA333 (5-pin SOT-23) or OPA2378 (8-pin SOIC/VSSOP). While all belong to TI's zero-drift portfolio, the OPA188AIDGKR uses an 8-pin MSOP (DGK) package with specific pin assignments: +IN (3), −IN (2), OUT (6), V+ (7), V− (4), and NC (1,5,8). Substituting with OPA333 or OPA2378 would require PCB redesign due to differing pin counts, functions, and footprints. Always verify mechanical and electrical compatibility before replacement-TI explicitly lists the OPA188AIDGKR as a standalone MSOP-8 variant in its device information table.
OPA188AIDGKR 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:
- Zero-Drift
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.8V/µs
- Gain Bandwidth Product:
- 2 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 160 pA
- Voltage - Input Offset:
- 6 µV
- Current - Supply:
- 450µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
OPA188AIDGKR FAQ
1.How can I place an order for OPA188AIDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA188AIDGKR 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 OPA188AIDGKR reliable?
The price and inventory of OPA188AIDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA188AIDGKR is usually 5 days.
3.What payment methods are accepted for OPA188AIDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA188AIDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA188AIDGKR?
OPA188AIDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA188AIDGKR 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 OPA188AIDGKR?
For technical support, including OPA188AIDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA188AIDGKR requirements.
6.How does Aetrix verify that OPA188AIDGKR is sourced from the original manufacturer or authorized distributors?
All OPA188AIDGKR 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 OPA188AIDGKR meets industry standards.
7.What is the process for return or replacement of OPA188AIDGKR?
All OPA188AIDGKR units undergo pre-shipment inspection (PSI). If there is an issue with OPA188AIDGKR, 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 OPA188AIDGKR part is unused and in its original packaging.
Return procedure for OPA188AIDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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