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Texas Instruments OPA189IDGKT
- Part No.:
- OPA189IDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA189IDGKT.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1CIRC 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:486
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Product details
Overview
OPA189IDGKT 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, 5.2 nV/√Hz input voltage noise at 1 kHz, 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 OPA189IDGKT datasheet, OPA189IDGKT pinout, OPA189IDGKT application, or OPA189IDGKT equivalent, this page provides verified specifications, VSSOP-8 package details, real-world settling performance in multichannel systems, and validated alternative options for precision DC-coupled measurement designs.
Technical Context
The OPA189IDGKT employs auto-zeroing architecture with chopper-stabilized input stage to achieve ultra-low drift and 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 across multiplexer channels.
This architecture enables fast 1.1 µs settling to 0.01% after a 10-V step while sustaining 168 dB CMRR and 170 dB open-loop gain over temperature - critical for stable gain accuracy in 24-bit delta-sigma ADC front-ends and precision DC power supply feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input offset voltage | ±0.4 µV typical, ±3 µV max - ensures sub-1-µV system-level offset error in low-gain sensor interfaces |
| Offset voltage drift | ±0.005 µV/°C - guarantees <±0.5 µV total drift over –40°C to +125°C operating range |
| Input voltage noise (1 kHz) | 5.2 nV/√Hz - supports high-resolution measurements without noise floor degradation in 100-kHz bandwidth applications |
| Gain bandwidth product | 14 MHz - enables stable unity-gain operation with >100 kHz closed-loop bandwidth for active filtering |
| Slew rate | 20 V/µs - allows full-scale 10-V step response within 0.5 µs, supporting fast transient detection |
| CMRR | 168 dB - rejects common-mode interference from noisy industrial power rails or shared ground paths |
| Supply range | ±2.25 V to ±18 V (4.5 V to 36 V single-supply) - compatible with legacy ±15 V systems and modern wide-input-range supplies |
Pinout & Package
VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 0.65 mm pitch, exposed thermal pad (not electrically connected), RoHS-compliant, moisture sensitivity level 2a.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Rail-to-rail output capable of sourcing/sinking ≥65 mA; settles to 0.01% in 1.1 µs for 10-V step |
| 2 | –IN | Inverting input with MUX-friendly architecture - no internal clamping diodes, prevents current injection during multiplexer switching |
| 3 | +IN | Noninverting input with >60 TΩ common-mode impedance; supports direct connection to high-impedance sensors |
| 4 | V– | Negative supply terminal; accepts voltages down to –18 V (dual) or ground (single); input common-mode extends to V– – 0.1 V |
| 5 | V+ | Positive supply terminal; accepts up to +36 V (single) or +18 V (dual); output swings within 15 mV of rail under no load |
| 6, 7, 8 | NC | No internal connection - must be left floating; not bonded or connected internally |
Key Features
| Feature | Design Value |
|---|---|
| MUX-friendly inputs | Eliminates anti-parallel diodes to avoid source loading and enable fast settling (<1.1 µs) in multiplexed data acquisition systems |
| Rail-to-rail output | Swings within 15 mV of supply rails at no load - maximizes dynamic range for 16-/24-bit ADCs powered from same supply |
| RFI/EMI filtered inputs | Integrated input filtering suppresses high-frequency interference from switch-mode power supplies or RF transceivers |
| Zero-drift architecture | Auto-zeroing core achieves 0.005 µV/°C drift - reduces calibration frequency in field-deployed test equipment |
| Wide supply range | Operates from 4.5 V to 36 V - supports both low-voltage portable instruments and industrial ±15 V systems |
Applications
| Battery Test System | Analog Input Module |
|---|---|
Use Scenario: Precision voltage and current measurement during charge/discharge cycling of Li-ion and lead-acid batteries. IC Role / Device Role / Timing Role: Front-end amplifier for shunt-based current sensing and cell voltage monitoring with 24-bit sigma-delta ADC interface. Use Value: Sub-1-µV offset and 0.005 µV/°C drift ensure <±0.01% full-scale error over temperature without recalibration. |
Use Scenario: Industrial PLC analog input card accepting 4–20 mA, ±10 V, and thermocouple signals. IC Role / Device Role / Timing Role: Programmable-gain amplifier and anti-alias filter driver with multiplexed channel support. Use Value: MUX-friendly inputs eliminate settling delays between channels, enabling 100 kSPS multichannel sampling without crosstalk. |
| Weigh Scale | DC Power Supply Feedback |
Use Scenario: High-resolution strain gauge bridge amplification in platform scales and industrial load cells. IC Role / Device Role / Timing Role: Low-noise, low-drift instrumentation amplifier front-end with 0.1 µVPP 0.1–10 Hz noise. Use Value: 5.2 nV/√Hz noise and 168 dB CMRR reject EMI from nearby motors and inverters while preserving microvolt-level resolution. |
Use Scenario: Voltage and current sense amplifier in programmable bench and lab DC power supplies. IC Role / Device Role / Timing Role: Isolated feedback path amplifier driving error amplifier input in constant-voltage/constant-current control loop. Use Value: 14-MHz GBW and 20 V/µs slew rate support fast transient response (<10 µs recovery) to load steps without oscillation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA188IDR | Higher 0.085 µV/°C drift, 8.8 nV/√Hz noise, same SOIC/VSSOP packaging | Lower cost for moderate-precision applications where <0.1 µV/°C drift is acceptable | Choose when 14-MHz bandwidth is unnecessary and 25-µV max offset meets system requirements |
| OPA388IDBVR | 5-µV max offset, 0.05 µV/°C drift, 7 nV/√Hz noise, 10-MHz GBW, 5.5-V max supply | Optimized for low-voltage, battery-powered precision sensors - not suitable for 36-V industrial rails | Prefer for portable instrumentation with 3.3-V or 5-V supplies where rail-to-rail input is required |
Compared with OPA188IDR and OPA388IDBVR, the OPA189IDGKT provides the lowest drift (0.005 µV/°C) and lowest noise (5.2 nV/√Hz) in a 36-V capable package - making it uniquely suited for high-accuracy, wide-supply industrial measurement where long-term stability and multiplexer compatibility are mandatory.
Availability
OPA189IDGKT is available at Aetrix Electronics and suitable for battery test systems, analog input modules, weigh-scale electronics, and DC power supply feedback circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA189IDGKT 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-accuracy, low-drift, multiplexed analog front-ends in test & measurement, industrial automation, and precision power systems - emphasizing MUX compatibility, robust ESD protection, and guaranteed performance from –40°C to +125°C.
FAQ
What is the maximum supply voltage rating for OPA189IDGKT?
The OPA189IDGKT supports a maximum supply voltage of ±20 V (dual) or 40 V (single), with recommended operation from ±2.25 V to ±18 V (4.5 V to 36 V). Absolute maximum ratings are defined per TI SBOS830I Rev I - exceeding these limits risks permanent damage. For continuous reliability in industrial environments, operation within the recommended range is strongly advised.
Does OPA189IDGKT support rail-to-rail input operation?
No, the OPA189IDGKT features rail-to-rail *output* but not rail-to-rail input. Its input common-mode voltage range extends from V– – 0.1 V to V+ – 2.5 V. This allows operation with inputs near the negative rail but requires ≥2.5 V headroom below the positive rail - a deliberate trade-off to maintain ultra-low offset and drift performance.
How does the MUX-friendly input architecture of OPA189IDGKT improve multichannel system performance?
The OPA189IDGKT omits internal anti-parallel input diodes, eliminating inrush current when large differential voltages are applied during multiplexer switching. This preserves source impedance integrity and enables full-scale settling to 0.01% in just 1.1 µs - significantly reducing inter-channel crosstalk and dead time in high-channel-count data acquisition systems.
What is the typical 0.1-Hz to 10-Hz peak-to-peak input voltage noise of OPA189IDGKT?
The OPA189IDGKT delivers 0.1 µVPP typical input voltage noise over the 0.1-Hz to 10-Hz band - a key specification for precision DC and low-frequency sensor applications such as weigh scales and thermocouple amplifiers where flicker noise dominates system error budgets.
Is OPA189IDGKT pin-compatible with other members of the OPAx189 family?
No - the OPA189IDGKT (single-channel, VSSOP-8) is not pin-compatible with OPA2189IDGKT (dual-channel, VSSOP-8) or OPA4189IPW (quad-channel, TSSOP-14). While all share identical pin functions per channel, channel count and package footprint differ. PCB layout must be specific to the OPA189IDGKT's 8-pin VSSOP configuration.
OPA189IDGKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- 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:
- 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-VSSOP
OPA189IDGKT FAQ
1.How can I place an order for OPA189IDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA189IDGKT 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 OPA189IDGKT reliable?
The price and inventory of OPA189IDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA189IDGKT is usually 5 days.
3.What payment methods are accepted for OPA189IDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA189IDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA189IDGKT?
OPA189IDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA189IDGKT 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 OPA189IDGKT?
For technical support, including OPA189IDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA189IDGKT requirements.
6.How does Aetrix verify that OPA189IDGKT is sourced from the original manufacturer or authorized distributors?
All OPA189IDGKT 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 OPA189IDGKT meets industry standards.
7.What is the process for return or replacement of OPA189IDGKT?
All OPA189IDGKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA189IDGKT, 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 OPA189IDGKT part is unused and in its original packaging.
Return procedure for OPA189IDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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