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Texas Instruments OPA188AIDR
- Part No.:
- OPA188AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA188AIDR.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:964
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Product details
Overview
OPA188AIDR from Texas Instruments is a precision zero-drift operational amplifier optimized for high-accuracy, low-drift signal conditioning in industrial and test equipment. It delivers 25 μV maximum input offset voltage, 0.085 μV/°C max drift, 8.8 nV/√Hz input voltage noise, rail-to-rail output swing within 15 mV of rails, and operates from ±2 V to ±18 V supplies. It is widely used in weight scales, analog input modules, and battery test systems where long-term dc stability is critical.
For engineers reviewing the OPA188AIDR datasheet, OPA188AIDR pinout, OPA188AIDR application, or OPA188AIDR equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options - all grounded in TI's SBOS642C production data sheet (Rev. C, Jan 2020).
Technical Context
The OPA188AIDR implements TI's proprietary auto-zeroing architecture with periodic correction, eliminating 1/f (flicker) noise and achieving near-zero drift over temperature and time. Its input stage includes negative-rail capability and RFI-filtered inputs, enabling robust operation in noisy industrial environments.
This single-channel op amp features unity-gain stability, 2 MHz gain-bandwidth product, 0.8 V/μs slew rate, and 136 dB open-loop gain. It maintains 142 dB PSRR and 146 dB CMRR across –40°C to +125°C, supporting high-precision closed-loop configurations without external trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 25 μV (max) - enables sub-0.01% error in 2.5 V full-scale 16-bit DAQ systems without calibration. |
| Offset Drift | 0.085 μV/°C (max) - ensures ≤0.5 μV total drift over 0–70°C ambient range, critical for unattended instrumentation. |
| Input Voltage Noise | 8.8 nV/√Hz @ 1 kHz - supports low-noise sensor amplification (e.g., strain gauges, RTDs) without dominating system noise floor. |
| Supply Range | ±2 V to ±18 V (4 V to 36 V single-ended) - compatible with legacy ±15 V industrial rails and modern low-voltage 3.3 V/5 V logic interfaces. |
| Output Swing | Rail-to-rail, within 15 mV of rails (no load) - maximizes dynamic range in single-supply data acquisition front-ends. |
| Quiescent Current | 510 μA (max) - allows precision performance in power-constrained portable test gear while maintaining <100 ppm thermal self-heating. |
| CMRR / PSRR | 146 dB / 142 dB - rejects common-mode interference and supply ripple in high-gain transducer interfaces (e.g., bridge sensors). |
Pinout & Package
OPA188AIDR is supplied in an SOIC-8 (D) package measuring 4.90 mm × 3.91 mm, rated for –40°C to +125°C operation. The package includes two no-connect (NC) pins for layout flexibility and thermal isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 3) | Noninverting input | High-impedance (10¹² Ω) node accepting reference or sensor signals; includes negative-rail common-mode range. |
| –IN (Pin 2) | Inverting input | High-impedance feedback node; RFI filtering reduces susceptibility to EMI in industrial enclosures. |
| OUT (Pin 6) | Amplifier output | Capable of sourcing/sinking ±16 mA; drives 10 kΩ loads with <15 mV headroom to rails. |
| V+ (Pin 7) | Positive supply | Accepts up to ±20 V absolute max; decoupling with 0.1 μF ceramic capacitor required per TI layout guidelines. |
| V– (Pin 4) | Negative supply | Supports true negative-rail input operation; enables single-ended sensor interfacing with ground-referenced sources. |
| NC (Pins 1, 5, 8) | No internal connection | May be left floating or tied to ground for mechanical stability; no electrical function or thermal benefit claimed. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift auto-zero architecture | Eliminates 1/f noise and achieves <0.1 μV/°C effective drift - essential for multi-hour calibration-free measurements. |
| Rail-to-rail output with 15-mV headroom | Preserves >99.4% of full-scale range in 3.3 V or ±15 V systems, maximizing ADC utilization in precision DAQ. |
| RFI-filtered inputs | Integrated input filtering suppresses >30 dB of RF interference above 10 MHz - improves immunity in motor-drive or switching-power environments. |
| Phase-reversal protection | Prevents output inversion when inputs exceed common-mode range - avoids catastrophic control-loop failures in closed-loop transmitters. |
| Wide supply range (±2 V to ±18 V) | Enables reuse across legacy ±15 V PLC I/O modules and modern low-voltage IoT sensor nodes without redesign. |
Applications
| Weight Scale System | Analog Input Module |
|---|---|
|
Use Scenario: Amplifies mV-level output from load-cell bridges in commercial and industrial weighing platforms. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with ultra-low drift to maintain calibration over temperature cycles and years of operation. Use Value: Enables <0.005% linearity error over –10°C to +50°C ambient without recalibration, meeting OIML R76 Class III requirements. |
Use Scenario: Signal conditioning stage in 16-bit isolated analog input cards for PLCs and DCS systems. IC Role / Device Role / Timing Role: Low-drift buffer and gain stage preceding sigma-delta ADC, rejecting supply and common-mode noise. Use Value: Delivers 16-bit effective resolution at 1 kSPS by maintaining <1 LSB offset drift over full industrial temperature range. |
| Flow Transmitter | Battery Test Equipment |
|
Use Scenario: Amplifies differential pressure sensor output in Coriolis and magnetic flow meters. IC Role / Device Role / Timing Role: High-PSRR, high-CMRR signal conditioner that rejects 4–20 mA loop noise and supply ripple. Use Value: Achieves <±0.1% full-scale accuracy over 15-year field life, meeting API RP 1171 and IEC 61508 functional safety margins. |
Use Scenario: Precision current-sense amplifier in programmable electronic loads and battery cyclers. IC Role / Device Role / Timing Role: Low-offset, low-drift gain block for shunt-based current measurement across 0.1 A–100 A ranges. Use Value: Supports ±100 ppm current accuracy over –20°C to +70°C, enabling traceable capacity and impedance characterization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA182AIDR | Lower 1/f noise (0.1 μVPP vs 0.25 μVPP), higher GBW (8 MHz vs 2 MHz), but higher IQ (1.3 mA vs 0.51 mA). | Better suited for high-speed precision filtering; less optimal for ultra-low-power battery-operated DAQ. | Select OPA182AIDR when bandwidth >5 MHz is required and quiescent current is not constrained. |
| LTC2057HMS8#PBF | Lower offset drift (0.035 μV/°C vs 0.085 μV/°C), higher PSRR (150 dB), but narrower supply range (±1.65 V to ±8.3 V). | Preferred in low-voltage medical sensors; incompatible with ±15 V industrial rails without level-shifting. | Choose LTC2057HMS8#PBF only for sub-5 V systems demanding best-in-class drift, with careful attention to supply compatibility. |
Compared with OPA188AIDR, OPA182AIDR trades lower drift for higher speed and power, while LTC2057HMS8#PBF offers superior drift at the cost of supply voltage flexibility - making OPA188AIDR the balanced choice for wide-supply, general-purpose precision amplification.
Availability
OPA188AIDR is available at Aetrix Electronics and suitable for weight scale systems, analog input modules, and flow transmitter designs requiring stable component supply across extended industrial temperature ranges and multi-year production cycles.
Supply support for OPA188AIDR 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 expertise in precision signal chain solutions.
The OPA188AIDR belongs to TI's zero-drift op amp portfolio, engineered specifically for high-accuracy industrial sensing, test & measurement, and process control applications where long-term dc stability is non-negotiable.
FAQ
What is the maximum operating temperature range for the OPA188AIDR?
The OPA188AIDR is fully specified from –40°C to +125°C ambient temperature, with all key parameters-including offset voltage drift, CMRR, and PSRR-guaranteed across this range per TI's SBOS642C datasheet. This makes OPA188AIDR suitable for under-hood automotive subsystems and industrial control cabinets exposed to extreme thermal cycling.
Does the OPA188AIDR require external capacitors for stability?
No, the OPA188AIDR is unity-gain stable and does not require external compensation capacitors. However, TI mandates 0.1 μF ceramic decoupling capacitors placed as close as possible to the V+ and V– pins to suppress supply noise and ensure robust operation in noisy industrial environments - a requirement explicitly stated in Section 10 of the OPA188AIDR datasheet.
Can the OPA188AIDR drive capacitive loads?
Yes, the OPA188AIDR can safely drive up to 1 nF capacitive loads without oscillation, as confirmed in Section 7.5 of the datasheet. For larger loads (e.g., ADC input capacitance + PCB trace), TI recommends adding a small series resistor (25 Ω typical) between the OPA188AIDR output and the load to maintain phase margin - a technique validated in Figure 24 and Figure 25 of SBOS642C.
Is the OPA188AIDR pin-compatible with other TI zero-drift op amps?
The OPA188AIDR in SOIC-8 (D) package shares identical pinout with OPA2188 (dual) Pin 1–4 and Pin 5–8, but is not pin-compatible with OPA182AIDR or OPA211AIDR due to differing pin functions (e.g., OPA182 includes enable pin). Always verify pin mapping using TI's official package drawings - OPA188AIDR Pin 1, 5, and 8 are NC, while OPA182AIDR repurposes Pin 1 as EN.
What is the typical 0.1-Hz to 10-Hz noise performance of the OPA188AIDR?
The OPA188AIDR delivers 0.25 µVPP typical integrated noise from 0.1 Hz to 10 Hz, as measured per standard JEDEC methodology and published in Table 1 and Figure 16 of SBOS642C. This ultra-low flicker noise performance directly enables high-resolution, low-frequency measurements in strain gauge and thermopile amplifier applications without post-acquisition digital filtering.
OPA188AIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
OPA188AIDR FAQ
1.How can I place an order for OPA188AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA188AIDR 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 OPA188AIDR reliable?
The price and inventory of OPA188AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA188AIDR is usually 5 days.
3.What payment methods are accepted for OPA188AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA188AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA188AIDR?
OPA188AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA188AIDR 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 OPA188AIDR?
For technical support, including OPA188AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA188AIDR requirements.
6.How does Aetrix verify that OPA188AIDR is sourced from the original manufacturer or authorized distributors?
All OPA188AIDR 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 OPA188AIDR meets industry standards.
7.What is the process for return or replacement of OPA188AIDR?
All OPA188AIDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA188AIDR, 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 OPA188AIDR part is unused and in its original packaging.
Return procedure for OPA188AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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