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Texas Instruments OPA188AID
- Part No.:
- OPA188AID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA188AID.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:584
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Product details
Overview
OPA188AID from Texas Instruments is a precision zero-drift operational amplifier with rail-to-rail output, 25 μV maximum offset voltage, 0.085 μV/°C max drift, and 2 MHz gain bandwidth. It operates from ±2 V to ±18 V supply, supports input down to the negative rail, and delivers 15 mV rail-to-rail swing under no load - ideal for high-accuracy analog front-ends in industrial sensing and data acquisition.
For engineers reviewing the OPA188AID datasheet, OPA188AID pinout, OPA188AID application, or OPA188AID equivalent, key selection criteria include ultra-low dc drift stability over temperature, RFI-filtered inputs for noisy environments, and compatibility with single-supply (4–36 V) or dual-supply (±2–±18 V) configurations in precision measurement systems.
Technical Context
The OPA188AID employs 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 EMI/RFI filtering and supports common-mode voltages extending to the negative rail, while the output swings within 15 mV of both rails at ±18 V supply.
This device achieves 146 dB CMRR and 142 dB PSRR at ±18 V, with open-loop gain of 136 dB and 8.8 nV/√Hz input voltage noise density at 1 kHz. It is unity-gain stable, drives up to 1 nF capacitive loads, and features overload recovery in 1 μs - all specified across –40°C to +125°C.
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. |
| Offset Drift | 0.085 μV/°C maximum - contributes <0.1 μV total drift over –40°C to +125°C, critical for unattended sensor nodes. |
| Gain Bandwidth | 2 MHz - supports stable closed-loop operation at G = 10 up to 200 kHz with minimal phase margin loss. |
| Input Voltage Noise | 0.25 µVPP (0.1–10 Hz) - enables sub-µV resolution in low-frequency weigh scale and strain gauge amplifiers. |
| Supply Range | ±2 V to ±18 V (or 4–36 V single) - accommodates legacy industrial rails and modern low-power 5 V/12 V systems. |
| Quiescent Current | 510 μA maximum - allows battery-powered precision instrumentation with >1-year runtime on 2000 mAh cells. |
| CMRR / PSRR | 146 dB / 142 dB - rejects >200 V of common-mode or supply ripple in high-gain transducer interfaces. |
Pinout & Package
OPA188AID is packaged in an 8-pin SOIC (SO-8) with nominal body size 4.90 mm × 3.91 mm, rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 3) | Noninverting input | High-impedance node (10¹² Ω || 9.5 pF); accepts signals down to V– rail; requires matched layout to minimize thermoelectric offset. |
| –IN (Pin 2) | Inverting input | Differential input node; paired with +IN for precision feedback; sensitive to PCB trace asymmetry and thermal gradients. |
| OUT (Pin 6) | Amplifier output | Rail-to-rail capable (15 mV from rails, no load); drives ≥10 kΩ loads; stable with ≤1 nF capacitive load. |
| V+ (Pin 7) | Positive supply | Highest potential rail; must be decoupled with 0.1 µF ceramic capacitor placed ≤2 mm from pin. |
| V– (Pin 4) | Negative supply | Lowest potential rail; supports input common-mode down to this rail; same decoupling requirement as V+. |
| NC (Pins 1, 5, 8) | No internal connection | Unused terminals; may be left floating or tied to ground for mechanical stability - no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift auto-zero architecture | Eliminates 1/f noise and guarantees <0.1 μV total offset drift over full temperature range and 1000-hour life test. |
| RFI-filtered inputs | Integrated EMI rejection circuitry suppresses >60 dB of RF interference at 900 MHz - critical for factory-floor sensor nodes. |
| Rail-to-rail output with negative-rail input | Enables single-supply operation with ground-referenced sensors (e.g., bridge transducers), reducing system BOM count. |
| Phase-reversal protection | Prevents output inversion when input exceeds common-mode range - avoids catastrophic control loop failures in motor drives. |
| High PSRR/CMRR over frequency | Maintains >120 dB rejection up to 100 kHz, ensuring stable gain in switching power supply monitoring applications. |
Applications
| Weight Scale System | Analog Input Module |
|---|---|
Use Scenario: High-resolution load cell signal conditioning in commercial and industrial weighing platforms requiring NTEP/EC type approval. IC Role / Device Role / Timing Role: Primary instrumentation amplifier front-end with 25 μV offset and 0.085 μV/°C drift, directly interfacing to 350 Ω Wheatstone bridges. Use Value: Enables 1:100,000 resolution (0.001% FS) without auto-zero calibration cycles, reducing firmware complexity and test time. |
Use Scenario: Universal analog input channel in PLC I/O modules accepting ±10 V, 0–20 mA, or thermocouple inputs. IC Role / Device Role / Timing Role: Precision buffer and level-shifter between field-side isolation and ADC driver stage, operating at 4–36 V supply. Use Value: 146 dB CMRR rejects ground-loop noise in multi-channel cabinets; RFI filtering prevents misreads during radio-frequency welding events. |
| Flow Transmitter | Battery Test Equipment |
Use Scenario: Signal conditioning for Coriolis or magnetic flow meters where microvolt-level velocity signals must be amplified with ppm-level stability. IC Role / Device Role / Timing Role: Low-noise, low-drift gain stage preceding sigma-delta ADC; powered from isolated 24 V loop supply. Use Value: 0.25 µVPP (0.1–10 Hz) noise floor preserves dynamic range for <1 mL/min flow resolution; 125°C rating supports hot-pipe mounting. |
Use Scenario: Precision current-sense and voltage-monitoring front-end in automated battery formation and grading systems. IC Role / Device Role / Timing Role: Bidirectional current-sense amplifier with rail-to-rail output driving 16-bit SAR ADC; operates from ±15 V supply rails. Use Value: 25 μV offset ensures <100 nA error in 10 A shunt measurements; 510 μA IQ enables low-power standby modes between charge cycles. |
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 same SO-8 package; identical specs per channel except quiescent current doubles to 1.02 mA. | Preferred for space-constrained dual-sensor systems (e.g., differential pressure + temperature) where layout reuse is critical. | Select OPA2188AIDR only when dual-channel integration reduces board area or interconnect complexity - not for cost savings. |
| AD8628ARZ | 2 μV max offset, 0.005 μV/°C drift, but limited 5.5 V max supply and 2.5 MHz GBW; higher 1.5 mA IQ. | Suitable for low-voltage (3.3 V/5 V) medical sensors where ultra-low drift outweighs supply flexibility. | Choose AD8628ARZ only for <6 V systems demanding sub-μV drift; avoid in industrial 24 V or ±15 V applications due to supply limitation. |
Compared with OPA188AID, OPA2188AIDR offers channel density at doubled current, while AD8628ARZ trades supply range and power for lower drift - making OPA188AID the optimal balance of wide supply, low drift, and industrial temperature capability.
Availability
OPA188AID is available at Aetrix Electronics and suitable for weight scale systems, analog input modules, and flow transmitter designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA188AID 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 focused on analog and embedded processing technologies, serving industrial, automotive, and communications markets with high-reliability components.
The OPA188AID belongs to TI's precision zero-drift op-amp family, engineered specifically for high-accuracy signal conditioning in harsh industrial environments where long-term dc stability and noise immunity are non-negotiable.
FAQ
What is the maximum operating temperature range for the OPA188AID?
The OPA188AID is fully specified from –40°C to +125°C ambient temperature, with all key parameters - including offset voltage drift (0.085 μV/°C), CMRR (≥120 dB), and quiescent current (≤600 μA) - guaranteed across this range. This makes OPA188AID suitable for under-hood automotive sensors and industrial control cabinets without derating.
Does the OPA188AID require external compensation for unity-gain stability?
No, the OPA188AID is internally compensated and unity-gain stable. It maintains ≥45° phase margin driving 10 kΩ || 100 pF loads, and its 2 MHz gain-bandwidth product ensures predictable performance in G = 1, G = –1, and G = +10 configurations without added compensation networks.
Can the OPA188AID operate from a single 5-V supply?
Yes - the OPA188AID supports single-supply operation from 4 V to 36 V. At 5 V, it delivers rail-to-rail output swing (within 15 mV of 0 V and 5 V), accepts inputs down to the negative rail (0 V), and maintains 25 μV max offset and 0.25 µVPP low-frequency noise - ideal for portable 5 V data loggers.
How does the auto-zero architecture of the OPA188AID affect its noise profile?
The OPA188AID's auto-zero architecture eliminates 1/f (flicker) noise, resulting in flat 8.8 nV/√Hz voltage noise density from 0.1 Hz upward and only 0.25 µVPP integrated noise in the 0.1–10 Hz band. This enables stable, low-drift amplification of ultra-low-frequency sensor outputs without noise-induced baseline wander.
Is the OPA188AID pin-compatible with other TI zero-drift op-amps like the OPA333?
No - the OPA188AID (SO-8) is not pin-compatible with the OPA333 (SC70-5 or SOT-23-5). They differ in package, pin count, supply range (OPA333: 1.8–5.5 V only), and offset drift (OPA333: 0.05 μV/°C vs OPA188AID: 0.085 μV/°C). Direct replacement requires PCB redesign and validation of supply, layout, and thermal constraints for OPA188AID.
OPA188AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SOIC
OPA188AID FAQ
1.How can I place an order for OPA188AID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA188AID 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 OPA188AID reliable?
The price and inventory of OPA188AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA188AID is usually 5 days.
3.What payment methods are accepted for OPA188AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA188AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA188AID?
OPA188AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA188AID 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 OPA188AID?
For technical support, including OPA188AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA188AID requirements.
6.How does Aetrix verify that OPA188AID is sourced from the original manufacturer or authorized distributors?
All OPA188AID 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 OPA188AID meets industry standards.
7.What is the process for return or replacement of OPA188AID?
All OPA188AID units undergo pre-shipment inspection (PSI). If there is an issue with OPA188AID, 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 OPA188AID part is unused and in its original packaging.
Return procedure for OPA188AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA188AID Tags
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