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Texas Instruments OPA2189ID
- Part No.:
- OPA2189ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2189ID.pdf
- Description:
- IC OPAMP ZERO-DRIFT 2 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,732
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Product details
Overview
OPA2189ID from Texas Instruments is a dual-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, 0.01 μV/°C max offset drift over –40°C to +125°C, 14-MHz gain bandwidth, 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 OPA2189ID datasheet, OPA2189ID pinout, OPA2189ID application, or OPA2189ID equivalent, key selection criteria include ultra-low drift performance at 100 kHz signal bandwidth, crosstalk of 120 dB at 100 kHz, and guaranteed rail-to-rail output swing into 2-kΩ loads across industrial temperature range.
Technical Context
The OPA2189ID implements auto-zeroing architecture with chopper-stabilized input stage to achieve near-zero drift and sub-microvolt offset. Its MUX-friendly input design eliminates anti-parallel diodes, maintaining high input impedance (>60 TΩ common-mode) and preventing source loading during large differential voltage transitions.
It operates from ±2.25 V to ±18 V (4.5 V to 36 V single supply), supports true rail-to-rail output (within 15 mV of rails, no load), and features robust ESD protection (±4 kV HBM). Channel separation is specified at 150 dB DC and 120 dB at 100 kHz, confirming suitability for dual-channel simultaneous sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±5 μV max (–40°C to +125°C); enables <1 LSB error in 20-bit ADC systems with 5-V full-scale |
| Offset Drift | ±0.01 μV/°C max (–40°C to +125°C); contributes <0.1 μV total drift over 10°C ambient shift |
| Gain Bandwidth | 14 MHz; supports stable G=100 closed-loop operation up to ~140 kHz with phase margin >60° |
| Crosstalk | 120 dB at 100 kHz; ensures <0.0001% inter-channel interference in time-division multiplexed sensor arrays |
| Supply Range | ±2.25 V to ±18 V; compatible with standard industrial ±15 V rails and low-voltage 5-V or 3.3-V logic interfaces |
| Quiescent Current | 1.7 mA per amplifier max; allows dual-channel precision amplification within 3.4 mA total budget for portable instruments |
| CMRR | 168 dB at ±18 V; rejects >100 million:1 common-mode noise in bridge sensor applications |
Pinout & Package
OPA2189ID is packaged in an 8-pin SOIC (D) package measuring 4.90 mm × 3.90 mm, with exposed pad not present and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output; rail-to-rail capable, drives ≥10 kΩ load with <0.01% settling in 1.1 µs |
| 2 | –IN A | Inverting input channel A; MUX-friendly, no internal clamping diodes, supports ±20 V differential without current surge |
| 3 | +IN A | Noninverting input channel A; 60 TΩ || 1.7 pF input impedance preserves RC time constants in high-Z sensor interfaces |
| 4 | V– | Negative supply terminal; accepts –20 V absolute max; connects to system ground or negative rail |
| 5 | +IN B | Noninverting input channel B; electrically isolated from channel A; enables independent biasing |
| 6 | –IN B | Inverting input channel B; identical MUX-friendly architecture as channel A |
| 7 | OUT B | Amplifier B output; fully independent output stage; no shared quiescent current path with OUT A |
| 8 | V+ | Positive supply terminal; accepts +40 V absolute max; decoupling required within 1 cm for stability |
Key Features
| Feature | Design Value |
|---|---|
| MUX-friendly inputs | No internal anti-parallel diodes - prevents current injection and settling degradation when switching between high-impedance sources |
| Rail-to-rail output | Swings to within 15 mV of either rail under no load; maintains linearity down to 20 mV from rail at 10 kΩ |
| Zero-drift architecture | Auto-zeroing + chopper stabilization achieves 0.01 μV/°C max drift, eliminating thermal-induced baseline drift in long-duration measurements |
| Ultra-low 1/f noise | 0.1 µVPP integrated 0.1–10 Hz noise - critical for DC-coupled strain gauge and thermocouple amplification |
| RFI/EMI filtered inputs | Integrated input filtering suppresses >40 dB of RF interference above 10 MHz, improving immunity in noisy industrial environments |
Applications
| Battery Test System | Analog Input Module |
|---|---|
Use Scenario: Precision voltage and current measurement during charge/discharge cycling of Li-ion cells at 100 kHz sampling rate. IC Role / Device Role / Timing Role: Dual-channel signal conditioner for cell voltage (CH A) and shunt current (CH B), rejecting common-mode ripple while preserving µV-level resolution. Use Value: 120 dB crosstalk at 100 kHz prevents current-sense transients from corrupting adjacent voltage readings; 1.1 µs 0.01% settling enables accurate snapshot capture. | Use Scenario: Industrial PLC analog input card acquiring signals from 4–20 mA transmitters, RTDs, and thermocouples. IC Role / Device Role / Timing Role: Dual-channel programmable-gain amplifier front-end with matched gain/offset tracking across channels. Use Value: 0.01 μV/°C max drift ensures <1 µV total offset variation over 85°C operating range - eliminating recalibration in uncooled enclosures. |
| Weigh Scale Front-End | DC Power Supply Monitor |
Use Scenario: Amplifying mV-level outputs from precision load cells in legal-for-trade weighing equipment. IC Role / Device Role / Timing Role: Low-noise, zero-drift instrumentation amplifier driver with 0.1 µVPP 0.1–10 Hz noise floor. Use Value: 5.2 nV/√Hz wideband noise + 0.1 µVPP flicker noise enables 24-bit effective resolution without external averaging. | Use Scenario: Real-time monitoring of output voltage and current in programmable DC power supplies with <10 ppm accuracy requirement. IC Role / Device Role / Timing Role: Dual-channel precision buffer for sense lines, rejecting supply ripple and load transients. Use Value: 168 dB CMRR rejects >100 V of common-mode ripple on sense lines; rail-to-rail output drives ADC reference buffers directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2182ID | Lower 1/f noise (0.03 µVPP), but 5.8 MHz GBW and no MUX-friendly inputs; 0.02 µV/°C drift | Preferred for ultra-low-noise DC measurements only; unsuitable for multiplexed sensor arrays due to input diode clamps | Select OPA2182ID only when 0.1–10 Hz noise dominates error budget and channel switching is absent |
| LTC2057HMS8#PBF | Higher offset drift (0.03 µV/°C), 10 MHz GBW, no specified crosstalk; requires external compensation for capacitive loads | Used in medical-grade EEG amplifiers where ultra-low input bias current (<1 pA) is mandatory | Choose LTC2057HMS8#PBF only when femtoampere input bias current is required and MUX compatibility is not needed |
Compared with OPA2189ID, OPA2182ID trades MUX compatibility and bandwidth for lower flicker noise, while LTC2057HMS8#PBF offers superior input bias current but lacks guaranteed crosstalk and multiplexing robustness - making OPA2189ID the optimal choice for high-channel-count, high-accuracy industrial data acquisition.
Availability
OPA2189ID is available at Aetrix Electronics and suitable for battery test systems, analog input modules, weigh scale front-ends, and DC power supply monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA2189ID 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The OPAx189 product line was designed specifically for high-precision, low-drift signal conditioning in multiplexed data acquisition systems - emphasizing MUX-friendly inputs, rail-to-rail output, and guaranteed performance from –40°C to +125°C.
FAQ
What is the maximum operating temperature range for the OPA2189ID?
The OPA2189ID is fully specified from –40°C to +125°C ambient temperature. All key parameters - including input offset voltage (±8 µV max), offset drift (±0.01 µV/°C), and crosstalk (120 dB at 100 kHz) - are guaranteed across this full industrial temperature range, enabling deployment in uncooled control cabinets and automotive under-hood environments.
Does the OPA2189ID support true rail-to-rail input operation?
No, the OPA2189ID does not support rail-to-rail input. Its common-mode input voltage range extends from (V–) – 0.1 V to (V+) – 2.5 V. However, it does provide rail-to-rail output swing - within 15 mV of either supply rail under no load - and includes negative rail input capability, allowing direct connection to ground-referenced sensors without level shifting.
How does the MUX-friendly input architecture of the OPA2189ID improve system performance?
The OPA2189ID omits internal anti-parallel input diodes, eliminating inrush current when large differential voltages are applied during multiplexer switching. This preserves source impedance integrity, reduces settling time by up to 3× compared to conventional op-amps, and prevents corruption of adjacent channel measurements - directly enabling faster scan rates in multichannel data loggers using the OPA2189ID.
What is the typical 0.1-Hz to 10-Hz noise specification for the OPA2189ID?
The OPA2189ID delivers 0.1 µVPP typical integrated input-referred voltage noise over the 0.1-Hz to 10-Hz band. This ultra-low flicker noise performance is critical for DC-coupled applications such as weigh scales and thermocouple amplifiers, where low-frequency noise dominates total error and cannot be filtered post-acquisition.
Can the OPA2189ID drive capacitive loads without instability?
The OPA2189ID is stable for capacitive loads ≤100 pF in unity-gain configuration. For larger loads, external isolation resistance (e.g., 50 Ω in series with the output) is recommended. The device's small-signal overshoot vs. capacitive load curve (Figure 7-26) confirms predictable peaking behavior, enabling robust design of anti-aliasing filters and cable-driven outputs in the OPA2189ID-based signal chain.
OPA2189ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- 14 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 70 pA
- Voltage - Input Offset:
- 1.5 µV
- Current - Supply:
- 1.3mA
- Current - Output / Channel:
- 65 mA
- 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
OPA2189ID FAQ
1.How can I place an order for OPA2189ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2189ID 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 OPA2189ID reliable?
The price and inventory of OPA2189ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2189ID is usually 5 days.
3.What payment methods are accepted for OPA2189ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2189ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2189ID?
OPA2189ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2189ID 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 OPA2189ID?
For technical support, including OPA2189ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2189ID requirements.
6.How does Aetrix verify that OPA2189ID is sourced from the original manufacturer or authorized distributors?
All OPA2189ID 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 OPA2189ID meets industry standards.
7.What is the process for return or replacement of OPA2189ID?
All OPA2189ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA2189ID, 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 OPA2189ID part is unused and in its original packaging.
Return procedure for OPA2189ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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