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Texas Instruments OPA189ID
- Part No.:
- OPA189ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA189ID.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:604
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Product details
Overview
OPA189ID from Texas Instruments is a single-channel, zero-drift, rail-to-rail output operational amplifier optimized for precision instrumentation and multiplexed analog signal conditioning. It delivers 3 μV maximum input offset voltage, 0.005 μV/°C drift, 14-MHz gain bandwidth, 20 V/µs slew rate, and MUX-friendly inputs that prevent inrush current during channel switching - enabling high-accuracy battery test systems and weigh scale front-ends.
For engineers reviewing the OPA189ID datasheet, OPA189ID pinout, OPA189ID application, or OPA189ID equivalent, this page provides verified specifications, SOIC-8 package details, real-world use cases in DC power supplies and analog input modules, and two validated alternative op-amps with documented performance trade-offs.
Technical Context
The OPA189ID employs auto-zeroing architecture to achieve ultra-low drift and offset, with CMRR of 168 dB and open-loop gain of 170 dB at ±18 V supply. Its MUX-friendly input stage eliminates anti-parallel diodes, maintaining high input impedance (>60 TΩ common-mode) and fast settling (1.1 µs to 0.01%) under large differential input transients.
It operates across –40°C to +125°C with supply range 4.5 V to 36 V (±2.25 V to ±18 V), quiescent current ≤1.7 mA, and robust RFI/EMI filtered inputs - making it suitable for industrial-grade signal chains where long-term stability and multichannel crosstalk immunity are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±3 µV max - enables sub-10 ppm accuracy in 16-bit+ data acquisition without calibration. |
| Offset Drift | ±0.005 µV/°C - ensures <1 µV total drift over full industrial temperature range (–40°C to +125°C). |
| Gain Bandwidth | 14 MHz - supports stable closed-loop operation up to G = 100 with >60° phase margin into 10-kΩ load. |
| Slew Rate | 20 V/µs - allows clean 10-V step response in ≤1.1 µs to 0.01%, critical for fast-settling multiplexed systems. |
| CMRR | 168 dB at ±18 V - rejects >10⁸× common-mode interference, essential for bridge sensor and thermocouple amplification. |
| Supply Range | 4.5 V to 36 V (single) or ±2.25 V to ±18 V (dual) - interoperable with legacy 24-V industrial rails and modern low-voltage mixed-signal systems. |
| Input Noise | 5.2 nV/√Hz @ 1 kHz & 0.1 µVPP (0.1–10 Hz) - preserves SNR in high-gain, low-frequency precision measurement paths. |
Pinout & Package
OPA189ID is packaged in an 8-pin SOIC (D) with body size 4.90 mm × 3.90 mm, rated for industrial temperature operation (–40°C to +125°C). Thermal resistance RθJA = 122.0°C/W enables reliable operation at ≤1.7 mA quiescent current without forced airflow.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection; must be left floating or grounded per layout best practices. |
| 2 | –IN | Inverting input terminal; accepts signals down to V– rail and supports MUX-friendly transient immunity. |
| 3 | +IN | Noninverting input terminal; exhibits >60 TΩ common-mode input impedance and EMI filtering. |
| 4 | V– | Negative supply pin; supports rail-to-rail input common-mode range extending to V– – 0.1 V. |
| 5 | NC | No internal connection; electrically isolated; no routing required. |
| 6 | OUT | Output terminal; delivers rail-to-rail swing (within 15 mV of rails, no load) and drives ≥10-kΩ loads. |
| 7 | V+ | Positive supply pin; accepts up to 36 V single-supply or ±18 V dual-supply operation. |
| 8 | NC | No internal connection; not bonded; leave unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| MUX-friendly input architecture | Eliminates inrush current during large differential input transitions, preserving source impedance integrity in multichannel scanning systems. |
| Zero-drift auto-zeroing core | Reduces long-term drift to <1 µV over 10 years (per Figure 7-38), eliminating periodic recalibration in sealed instruments. |
| Rail-to-rail output swing | Delivers >99% of full-scale dynamic range into 10-kΩ loads, maximizing ADC utilization in 24-bit sigma-delta systems. |
| RFI/EMI filtered inputs | Integrated input filtering suppresses >40 dB of 100-MHz RF interference, reducing need for external ferrites in noisy industrial environments. |
| Wide supply voltage range | Operates from 4.5 V to 36 V, enabling direct interface with 24-V PLC backplanes and battery-powered portable test gear. |
Applications
| Battery Test System | Analog Input Module |
|---|---|
Use Scenario: High-precision voltage and current monitoring during charge/discharge cycling of Li-ion cells. IC Role / Device Role / Timing Role: Precision current-sense amplifier and reference buffer in 4-wire Kelvin sensing path. Use Value: Sub-μV offset and 0.005 µV/°C drift ensure <0.005% full-scale error over temperature, meeting IEC 62619 compliance requirements. |
Use Scenario: Signal conditioning front-end for programmable logic controller (PLC) analog input cards handling 0–10 V, ±10 V, and 4–20 mA channels. IC Role / Device Role / Timing Role: Low-noise, high-CMRR gain stage preceding SAR ADC; handles multiplexed sensor inputs. Use Value: MUX-friendly inputs prevent settling delays during channel scan, enabling 1 kSPS throughput across 16 channels without performance degradation. |
| Weigh Scale | DC Power Supply Feedback |
Use Scenario: Amplification of microvolt-level outputs from strain-gauge load cells in industrial platform scales. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with gain = 1000, driving 24-bit delta-sigma ADC. Use Value: 0.1 µVPP 0.1–10 Hz noise and 168 dB CMRR reject thermal EMF and 50/60 Hz line interference, achieving <10 ppm linearity. |
Use Scenario: Voltage and current feedback sensing in digitally controlled 36-V, 10-A bench DC power supplies. IC Role / Device Role / Timing Role: Isolated sense amplifier output stage feeding digital controller via precision resistive divider. Use Value: Rail-to-rail output and 14-MHz bandwidth support fast transient response (<10 µs recovery) while maintaining 0.01% setpoint accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA388IDBVR | Lower bandwidth (10 MHz), higher offset drift (0.05 µV/°C), true rail-to-rail input/output, 5.5-V max supply. | Better suited for low-voltage, battery-powered portable instruments; not rated for 36-V industrial rails. | Select when supply is ≤5.5 V and rail-to-rail input is mandatory; avoid for 24-V systems or >125°C operation. |
| OPA192IDR | e-Trim CMOS process (not auto-zero); 25-µV offset, 0.8-µV/°C drift, 10-MHz GBW, 36-V rating. | Higher drift and offset limit use in long-duration, uncalibrated measurements; lower cost and wider availability. | Choose for cost-sensitive industrial controls where ±25 µV offset and 0.8 µV/°C drift are acceptable; verify thermal drift impact on system accuracy. |
Compared with OPA388IDBVR and OPA192IDR, the OPA189ID uniquely combines 36-V operation, 0.005 µV/°C drift, and MUX-friendly inputs - making it irreplaceable in high-accuracy, multichannel, wide-temperature industrial instrumentation where long-term calibration stability is non-negotiable.
Availability
OPA189ID is available at Aetrix Electronics and suitable for battery test systems, analog input modules, weigh scales, and DC power supply feedback loops requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for OPA189ID 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 OPAx189 family was designed specifically for high-stability, low-noise, multiplexed analog front-ends in industrial test equipment, process control, and precision measurement - prioritizing zero-drift performance, MUX compatibility, and extended temperature reliability.
FAQ
What is the maximum operating temperature for OPA189ID?
The OPA189ID is specified for continuous operation from –40°C to +125°C ambient temperature, with thermal metrics (RθJA = 122.0°C/W) validated for SOIC-8 packaging. This rating applies across the full 4.5 V to 36 V supply range and supports deployment in enclosed industrial enclosures without active cooling.
Does OPA189ID support true rail-to-rail input operation?
No, OPA189ID supports rail-to-rail *output* but its input common-mode range extends only to V– – 0.1 V and V+ – 2.5 V. It does not accept inputs at the positive rail. For true rail-to-rail input capability, consider OPA388IDBVR - though it lacks the OPA189ID's 36-V rating and ultra-low drift.
Can OPA189ID drive capacitive loads without instability?
Yes, OPA189ID maintains stability with capacitive loads up to 100 pF (per Figure 7-26), and small-signal overshoot remains <5% within this range. For loads >100 pF, external series resistance (≥10 Ω) at the output is recommended to preserve phase margin and settling behavior.
Is OPA189ID pin-compatible with other OPAx189 variants?
OPA189ID (SOIC-8) shares identical pinout with OPA2189ID and OPA2189IDGK in SOIC-8 and VSSOP-8 packages, but is *not* pin-compatible with OPA189DBV (SOT-23-5) due to different pin count and assignment. Always verify package-specific pin functions before PCB reuse.
What is the typical quiescent current of OPA189ID at 24 V supply?
At 24 V single supply and 25°C, OPA189ID draws 1.3 mA typical quiescent current (max 1.7 mA), rising to ≤1.8 mA across –40°C to +125°C. This enables low-power operation in always-on industrial sensors while retaining full precision performance.
OPA189ID 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:
- 20V/µs
- Gain Bandwidth Product:
- 14 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 70 pA
- Voltage - Input Offset:
- 0.4 µV
- Current - Supply:
- 1.3mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA189ID FAQ
1.How can I place an order for OPA189ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA189ID 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 OPA189ID reliable?
The price and inventory of OPA189ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA189ID is usually 5 days.
3.What payment methods are accepted for OPA189ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA189ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA189ID?
OPA189ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA189ID 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 OPA189ID?
For technical support, including OPA189ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA189ID requirements.
6.How does Aetrix verify that OPA189ID is sourced from the original manufacturer or authorized distributors?
All OPA189ID 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 OPA189ID meets industry standards.
7.What is the process for return or replacement of OPA189ID?
All OPA189ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA189ID, 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 OPA189ID part is unused and in its original packaging.
Return procedure for OPA189ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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