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Texas Instruments OPA188AIDGKT
- Part No.:
- OPA188AIDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA188AIDGKT.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1CIRC 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:287
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Product details
Overview
OPA188AIDGKT 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 max 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 ultra-stable DC gain.
For engineers reviewing the OPA188AIDGKT datasheet, OPA188AIDGKT pinout, OPA188AIDGKT application, or OPA188AIDGKT equivalent, this page provides verified specifications, validated pin functions, confirmed thermal metrics for DGK package, and two rigorously cross-checked alternative parts for precision sensor signal conditioning and low-drift instrumentation designs.
Technical Context
The OPA188AIDGKT implements TI's proprietary auto-zeroing architecture with periodic correction-eliminating 1/f flicker noise and enabling near-zero long-term drift. Its input stage includes negative-rail capability and RFI-filtered inputs, while the output stage delivers rail-to-rail swing with 0.8 V/μs slew rate and 20 μs 0.1% settling on 10-V steps.
This device uses a dual-stage chopper-stabilized topology (GM1/GM2/GM3 + CHOP1/CHOP2 + notch filter) to achieve 146 dB CMRR and 142 dB PSRR at DC, with open-loop gain of 136 dB. It is unity-gain stable and immune to phase reversal when inputs exceed common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 25 μV maximum - ensures ≤0.001% gain error in 2.5 V full-scale 16-bit DAQ systems without calibration. |
| Offset Drift | 0.085 μV/°C maximum - contributes <1 μV total drift over –40°C to +125°C, critical for uncalibrated industrial sensors. |
| Gain Bandwidth | 2 MHz - supports stable closed-loop operation up to G = 100 with ≥15° phase margin at 20 kHz. |
| Input Voltage Noise | 8.8 nV/√Hz at 1 kHz; 0.25 µVPP (0.1–10 Hz) - enables sub-16-bit noise floor in precision weigh scale bridges. |
| Supply Range | ±2 V to ±18 V (4 V to 36 V single supply) - compatible with legacy 24-V industrial rails and modern low-voltage battery-powered test equipment. |
| Quiescent Current | 510 μA maximum - allows 10+ channels per 5-mA supply budget in multi-channel analog input modules. |
| CMRR / PSRR | 146 dB / 142 dB - rejects >200 V of common-mode interference and suppresses >120 dB of power-supply ripple in noisy PLC environments. |
Pinout & Package
OPA188AIDGKT is packaged in an 8-pin MSOP (DGK), body size 3.00 mm × 3.00 mm, with exposed thermal pad (not electrically connected). Pin 1 is marked by beveled corner; pin numbering follows standard MSOP convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 3) | Noninverting input | High-impedance (10¹² Ω || 9.5 pF) node accepting signals down to V– rail; requires matched layout to –IN to minimize thermoelectric offset. |
| –IN (Pin 2) | Inverting input | Differential input terminal; RFI filtering reduces susceptibility to 100-MHz+ EMI in motor-drive adjacent PCBs. |
| OUT (Pin 6) | Amplifier output | Rail-to-rail capable: swings to within 15 mV of V+ or V– under no load; drives ≥10 kΩ loads with ≤350 mV headroom at temperature extremes. |
| V+ (Pin 7) | Positive supply | Highest potential supply rail; decoupling capacitor (0.1 μF) required within 3 mm for stable PSRR performance. |
| V– (Pin 4) | Negative supply | Lowest potential supply rail; supports true single-supply operation when tied to ground and V+ set to 36 V. |
| NC (Pins 1, 5, 8) | No internal connection | Unbonded die pads; must remain floating-no routing, stitching, or thermal relief connections permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift auto-zero architecture | Eliminates 1/f noise and guarantees ≤0.085 μV/°C drift-enables 1-year calibration-free operation in flow transmitters. |
| Rail-to-rail output with negative-rail input | Supports single-supply 0–5 V sensor interfaces and bipolar ±10 V DAC buffers without level-shifting circuitry. |
| RFI-filtered inputs | Integrated RC network attenuates >40 dB of 900-MHz cellular interference-critical for handheld battery testers in field environments. |
| Phase-reversal immunity | Prevents catastrophic output inversion during overvoltage transients in analog input protection circuits (e.g., ±30 V surge events). |
| MicroSIZE MSOP-8 package | 3.0 × 3.0 mm footprint saves >60% board area vs SOIC-8-enables high-density channel count in modular DAQ systems. |
Applications
| Weight Scale Front-End | Analog Input Module |
|---|---|
Use Scenario: Amplifies mV-level output from strain-gauge bridges in commercial and industrial weighing systems. IC Role / Device Role / Timing Role: Precision instrumentation amplifier core (configured as difference amp or in-amp driver) with ultra-low drift and noise. Use Value: Enables 1:10,000 resolution (0.01% FS) without auto-zeroing circuitry or periodic recalibration across –10°C to +50°C ambient. |
Use Scenario: Signal conditioning stage in 16-channel programmable logic controller (PLC) analog input cards. IC Role / Device Role / Timing Role: Low-drift buffer and gain stage for 4–20 mA loop receivers and thermocouple cold-junction compensation. Use Value: Maintains <±2 LSB error over full temperature range and lifetime, eliminating channel-to-channel calibration drift in factory automation. |
| Flow Transmitter Signal Chain | Battery Test Equipment |
Use Scenario: Amplifies low-level differential pressure sensor outputs in Coriolis and magnetic flow meters. IC Role / Device Role / Timing Role: Primary gain block before 24-bit sigma-delta ADC, rejecting common-mode noise from pump motors. Use Value: Achieves <0.1% reading accuracy over 15-year service life due to <4 μV long-term stability (1000-hr HTOL test). |
Use Scenario: Precision current-sense amplifier in programmable electronic loads and battery cyclers. IC Role / Device Role / Timing Role: High-side or low-side current monitor with rail-to-rail input/output for 0–5 A measurement range. Use Value: Delivers ±0.05% current measurement accuracy across –20°C to +70°C, supporting UL1642 compliance testing. |
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 offset (25 μV), drift (0.085 μV/°C), and bandwidth (2 MHz); 510 μA/channel quiescent current. | Optimized for space-constrained dual-sensor systems (e.g., differential pressure + temperature) where shared supply decoupling is acceptable. | Select when board layout benefits from dual-channel integration and thermal coupling improves matching between channels. |
| OPA333AIDBVR | Lower voltage range (5 V only); superior drift (0.05 μV/°C) but lower bandwidth (0.35 MHz); higher 0.1–10 Hz noise (1.1 µVPP). | Better suited for ultra-low-power, single-supply portable instruments (e.g., handheld multimeters) operating below 5.5 V. | Choose only for battery-powered applications requiring <20 μA quiescent current and where 0.35 MHz bandwidth suffices. |
Compared with OPA2188AIDR and OPA333AIDBVR, the OPA188AIDGKT uniquely balances wide 4–36 V supply flexibility, 2 MHz bandwidth, and 0.085 μV/°C drift in a space-saving MSOP-8-making it optimal for industrial analog input modules needing single-channel precision without voltage or speed compromise.
Availability
OPA188AIDGKT is available at Aetrix Electronics and suitable for weight scale front-ends, analog input modules, and flow transmitter signal chains requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for OPA188AIDGKT 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 amplifiers and industrial-grade signal chain solutions.
The OPA188AIDGKT belongs to TI's zero-drift operational amplifier product line, engineered specifically for high-accuracy, low-drift applications in industrial automation, test equipment, and sensor signal conditioning where long-term stability and dc precision are non-negotiable.
FAQ
What is the maximum operating temperature range for the OPA188AIDGKT?
The OPA188AIDGKT is fully specified from –40°C to +125°C ambient temperature. All key parameters-including offset voltage (±25 μV), drift (±0.085 μV/°C), CMRR (≥120 dB), and quiescent current (≤600 μA)-are guaranteed across this range per TI's SBOS642C datasheet revision January 2020.
Does the OPA188AIDGKT require external capacitors for stability?
No external compensation is needed-the OPA188AIDGKT is unity-gain stable. However, TI mandates 0.1-μF ceramic decoupling capacitors placed within 3 mm of both V+ (Pin 7) and V– (Pin 4) to maintain specified PSRR (142 dB) and prevent oscillation under noisy supply conditions.
Can the OPA188AIDGKT drive capacitive loads?
Yes-the OPA188AIDGKT can directly drive up to 1 nF capacitive load without instability, as confirmed in Section 7.5 of the datasheet. For loads >100 pF, TI recommends adding a series isolation resistor (e.g., 25 Ω) between OUT and the load to ensure monotonic step response and prevent overshoot.
Is the OPA188AIDGKT pin-compatible with other TI zero-drift op-amps?
No-the OPA188AIDGKT in MSOP-8 (DGK) has unique pinout: +IN (Pin 3), –IN (Pin 2), OUT (Pin 6), V+ (Pin 7), V– (Pin 4), and NC (Pins 1, 5, 8). It is not pin-compatible with OPA333 (SOT-23-5) or OPA2188 (SOIC-8 dual), which use different pin mappings and package footprints.
What is the typical 0.1-Hz to 10-Hz noise performance of the OPA188AIDGKT?
The OPA188AIDGKT delivers 0.25 µVPP typical input-referred noise in the 0.1-Hz to 10-Hz band, measured at TA = +25°C, VS = ±18 V. This value is guaranteed ≤250 nVPP maximum across –40°C to +125°C and forms the basis for its use in high-resolution weigh scale and precision DAQ applications.
OPA188AIDGKT 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
OPA188AIDGKT FAQ
1.How can I place an order for OPA188AIDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA188AIDGKT 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 OPA188AIDGKT reliable?
The price and inventory of OPA188AIDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA188AIDGKT is usually 5 days.
3.What payment methods are accepted for OPA188AIDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA188AIDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA188AIDGKT?
OPA188AIDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA188AIDGKT 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 OPA188AIDGKT?
For technical support, including OPA188AIDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA188AIDGKT requirements.
6.How does Aetrix verify that OPA188AIDGKT is sourced from the original manufacturer or authorized distributors?
All OPA188AIDGKT 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 OPA188AIDGKT meets industry standards.
7.What is the process for return or replacement of OPA188AIDGKT?
All OPA188AIDGKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA188AIDGKT, 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 OPA188AIDGKT part is unused and in its original packaging.
Return procedure for OPA188AIDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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