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Texas Instruments OPA2186DR
- Part No.:
- OPA2186DR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2186DR.pdf
- Description:
- RAIL-TO-RAIL INPUT AND OUTPUT, 2
- Quantity:
- Payment:
- Shipping:
Inventory:2,200
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Product details
Overview
OPA2186 from Texas Instruments is a dual-channel, rail-to-rail input/output, zero-drift operational amplifier optimized for precision signal conditioning in high-voltage (up to 24 V), low-power systems. It delivers 1 μV max offset voltage, 0.01 μV/°C max offset drift, 750 kHz gain bandwidth, and 90 µA per amplifier quiescent current - enabling high-accuracy current sensing, sensor interfacing, and active filtering in battery-powered or industrial instrumentation.
For engineers reviewing the OPA2186 datasheet, OPA2186 pinout, OPA2186 application, or OPA2186 equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options - all grounded in TI's SBOS968C production data sheet (July 2023 revision).
Technical Context
The OPA2186 employs a proprietary chopper-stabilized zero-drift architecture with dual-stage modulation (CHOP1/CHOP2), notch filtering, and feed-forward gain stages (GM_FF) to achieve near-zero long-term offset drift and eliminate 1/f noise. Its differential front-end supports rail-to-rail common-mode input beyond supply rails by ±200 mV.
This architecture enables phase-reversal protection, robust EMI rejection (via integrated RF/EMI filtering on inputs), and MUX-friendly operation - critical for multiplexed sensor arrays and high-side current shunt monitoring where input signals exceed V– or approach V+.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset voltage | ±1 μV max - enables sub-μV-level DC accuracy in strain gauge or thermocouple amplification without calibration. |
| Offset drift | ±0.01 μV/°C max - ensures ≤0.85 μV total drift over –40°C to +125°C, eliminating thermal nulling circuitry. |
| Supply range | 4.5 V to 24 V single or ±2.25 V to ±12 V dual - supports direct interface with 24-V industrial buses and low-voltage portable systems. |
| Gain bandwidth | 750 kHz - sufficient for anti-aliasing filters up to ~100 kHz and precision active filter design with <0.1% gain error. |
| Quiescent current | 90 µA per amplifier - allows dual-channel precision amplification in energy-constrained nodes like smart meters or wireless sensors. |
| Input common-mode range | (V–) – 0.2 V to (V+) + 0.2 V - enables true high-side current sensing at the positive rail without level-shifting components. |
| CMRR | 120 dB min (at ±12 V) - rejects >99.9999% of common-mode interference in noisy industrial environments. |
Pinout & Package
OPA2186 is available in two surface-mount packages: 8-pin SOIC (D) and 8-pin SOT-23 (DDF). Both share identical pin numbering and function mapping per TI SBOS968C Figure 5-3 and Table 5-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives feedback network; rail-to-rail swing within 5 mV of rails (no load). |
| 2 | ±IN A | Inverting input channel A - accepts differential or single-ended signals; immune to phase reversal beyond CM range. |
| 3 | +IN A | Noninverting input channel A - supports rail-to-rail common-mode input up to (V+) + 0.2 V. |
| 4 | V– | Negative supply terminal - connects to system ground or negative rail; must be decoupled with 0.1-µF capacitor. |
| 5 | +IN B | Noninverting input channel B - electrically isolated from channel A; enables independent dual-sensor conditioning. |
| 6 | ±IN B | Inverting input channel B - shares same EMI-filtered, MUX-friendly architecture as channel A. |
| 7 | OUT B | Amplifier B output - fully independent output stage; supports separate load and feedback paths. |
| 8 | V+ | Positive supply terminal - accepts up to 24 V; requires local 0.1-µF ceramic decoupling adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input with ±200 mV overvoltage tolerance | Eliminates external level shifters in high-side current sensing - e.g., direct connection to 24-V bus shunt. |
| Zero-drift chopper architecture with notch filtering | Removes 1/f noise and guarantees <1 μV offset stability over time and temperature - no manual recalibration needed. |
| Integrated EMI/RFI filtering on inputs | Reduces susceptibility to GSM, Wi-Fi, and switching regulator noise - critical for medical and industrial EMC compliance. |
| Phase-reversal protection | Prevents output inversion during input overdrive - avoids catastrophic control loop failure in closed-loop systems. |
| MUX-friendly input structure | Minimizes charge injection and crosstalk when used behind analog multiplexers - essential for multi-channel data acquisition. |
Applications
| High-Side Current Shunt Monitor | Smart Electricity Meter Sensor Interface |
|---|---|
Use Scenario: Monitoring battery or DC bus current in 24-V merchant power supplies using a shunt resistor placed between load and positive rail. IC Role / Device Role / Timing Role: Dual op amp configured as differential amplifier (channel A) and reference buffer (channel B) for precise ratiometric measurement. Use Value: Rail-to-rail input extends common-mode range to (V+) + 0.2 V, enabling direct shunt measurement without level-shifting circuitry - reducing BOM count and layout area. |
Use Scenario: Amplifying low-level outputs from Rogowski coils or current transformers in Class 0.2 electricity meters operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Precision DC-coupled signal conditioner for metrology ADC front-end, rejecting line-frequency interference via high CMRR. Use Value: 0.01 μV/°C drift ensures meter calibration remains valid over full temperature range - eliminating annual field recalibration. |
| Industrial Flow Transmitter Signal Chain | Portable Gas Detector Analog Front-End |
Use Scenario: Conditioning millivolt-level output from differential pressure sensors in Coriolis flow meters deployed in chemical plants. IC Role / Device Role / Timing Role: Low-noise, zero-drift instrumentation amplifier stage driving 24-bit sigma-delta ADC. Use Value: 125 nVRMS (0.1–10 Hz) and 40 nV/√Hz broadband noise preserve signal integrity for sub-0.1% flow accuracy. |
Use Scenario: Battery-powered handheld gas detectors requiring ultra-low power and stable baseline for electrochemical sensor outputs. IC Role / Device Role / Timing Role: Dual-channel signal conditioner: one channel for sensor biasing, one for transimpedance amplification. Use Value: 90 µA per amplifier enables >5-year battery life in AA-powered devices while maintaining <1 μV offset drift over shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2182 | Higher GBW (5.5 MHz), higher IQ (410 µA), same 1-μV offset but 0.03 μV/°C drift - not zero-drift architecture. | Better for AC-coupled, wideband sensor interfaces; unsuitable for long-term DC stability requirements. | Select OPA2182 only if bandwidth >1 MHz is required and thermal drift tolerance exceeds ±0.03 μV/°C. |
| LTC2057HS8#PBF | Single-channel, 0.5 μV offset, 0.005 μV/°C drift, 2.5 MHz GBW, 175 µA IQ - higher precision but no rail-to-rail input. | Requires external level-shifting for high-side sensing; better for lab-grade instrumentation than industrial field units. | Choose LTC2057HS8#PBF only when ultimate DC stability is prioritized over input voltage range and dual-channel integration. |
Compared with OPA2186, OPA2182 trades ultra-low drift for bandwidth and higher power, while LTC2057HS8#PBF achieves lower drift but sacrifices rail-to-rail input and channel count - making OPA2186 the optimal balance for industrial 24-V sensor signal chains requiring dual-channel, low-drift, and wide common-mode operation.
Availability
OPA2186 is available at Aetrix Electronics and suitable for PC PSU and game console unit power monitoring, merchant DC/DC converter feedback loops, and industrial flow transmitter signal conditioning requiring stable component supply across extended temperature and voltage ranges.
Supply support for OPA2186 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 heritage in precision op amp innovation.
The OPAx186 family was designed specifically for high-accuracy, low-power, wide-supply industrial and energy metering applications - emphasizing zero-drift stability, rail-to-rail usability, and robustness in electrically noisy environments.
FAQ
What is the maximum supply voltage rating for OPA2186?
The absolute maximum supply voltage for OPA2186 is 26 V (V+ to V–), but the recommended operating range is 4.5 V to 24 V. Operating at 24 V enables direct compatibility with industrial 24-V rails while maintaining full specification compliance across –40°C to +125°C. Exceeding 24 V risks violating recommended conditions and may impact long-term reliability.
Does OPA2186 support true rail-to-rail input beyond the supply rails?
Yes - OPA2186 supports input common-mode voltage from (V–) – 0.2 V to (V+) + 0.2 V. This ±200 mV overvoltage tolerance enables direct high-side current shunt monitoring without external level-shifting components, a key differentiator versus standard rail-to-rail op amps.
How does the zero-drift architecture of OPA2186 affect its noise performance?
OPA2186's chopper-stabilized architecture eliminates 1/f (flicker) noise, delivering flat 40 nV/√Hz input voltage noise density above 1 kHz and only 125 nVRMS integrated noise from 0.1 Hz to 10 Hz. This enables high-resolution DC measurements without noise-induced baseline drift.
Can OPA2186 drive capacitive loads without instability?
OPA2186 is unity-gain stable and can safely drive ≥100 pF loads with appropriate isolation resistance (e.g., 25 Ω series RISO). Figure 6-34 in the SBOS968C datasheet confirms ≥45° phase margin at 1000 pF with RISO = 50 Ω - critical for driving ADC input capacitance or long PCB traces.
Is OPA2186 suitable for multiplexed sensor applications?
Yes - OPA2186 features MUX-friendly inputs with minimized charge injection and low input bias current (±5 pA typ), preventing crosstalk and baseline shifts when switching between multiple sensors. Its EMI filtering further enhances robustness in dense mixed-signal layouts.
OPA2186DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- OPAx186
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.35V/µs
- Gain Bandwidth Product:
- 750 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 450 µV
- Current - Supply:
- 90µA (x2 Channels)
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 24 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA2186DR FAQ
1.How can I place an order for OPA2186DR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2186DR 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 OPA2186DR reliable?
The price and inventory of OPA2186DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2186DR is usually 5 days.
3.What payment methods are accepted for OPA2186DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2186DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2186DR?
OPA2186DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2186DR 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 OPA2186DR?
For technical support, including OPA2186DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2186DR requirements.
6.How does Aetrix verify that OPA2186DR is sourced from the original manufacturer or authorized distributors?
All OPA2186DR 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 OPA2186DR meets industry standards.
7.What is the process for return or replacement of OPA2186DR?
All OPA2186DR units undergo pre-shipment inspection (PSI). If there is an issue with OPA2186DR, 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 OPA2186DR part is unused and in its original packaging.
Return procedure for OPA2186DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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