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Texas Instruments OPA2186DDFR
- Part No.:
- OPA2186DDFR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
OPA2186DDFR.pdf
- Description:
- RAIL-TO-RAIL INPUT AND OUTPUT, 2
- Quantity:
- Payment:
- Shipping:
Inventory:3,476
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Product details
Overview
OPA2186DDFR from Texas Instruments is a dual-channel, zero-drift, rail-to-rail input/output 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 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 OPA2186DDFR datasheet, OPA2186DDFR pinout, OPA2186DDFR application, or OPA2186DDFR 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 (Rev. C, July 2023).
Technical Context
The OPA2186DDFR implements a proprietary auto-zeroing chopper architecture with notch filtering and dual-stage transconductance amplification (GM1/GM2/GM3) to eliminate 1/f noise and achieve near-zero long-term offset drift. Its rail-to-rail input stage supports common-mode voltages from (V–) – 0.2 V to (V+) + 0.2 V, enabling direct high-side shunt monitoring at the positive rail without level-shifting.
This dual op amp operates from ±2.25 V to ±12 V (or 4.5 V to 24 V single supply), features phase-reversal protection, EMI-filtered inputs, and MUX-friendly behavior - making it suitable for multiplexed sensor front-ends where channel switching induces transient errors in conventional amplifiers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset voltage | ±1 μV max - enables sub-μV-level DC accuracy in strain gauge or thermopile interfaces without calibration. |
| Offset drift | ±0.01 μV/°C max - ensures <±0.85 μV total drift over –40°C to +125°C, critical for unattended industrial meters. |
| Supply range | 4.5 V to 24 V - supports direct operation from 12-V/24-V industrial rails or wide-input DC/DC outputs. |
| Quiescent current | 90 µA per amplifier - allows dual-channel precision amplification in battery-powered flow transmitters with multi-year runtime. |
| Gain bandwidth | 750 kHz - sufficient for closed-loop control of slow-moving mechanical systems (e.g., valve positioners) with <1% gain error at 100 kHz. |
| Slew rate | 0.35 V/µs - supports clean 1-V step response in <7.5 µs (0.1% settling), suitable for fast-sampling sensor ADC drivers. |
| Input CMVR | (V–) – 0.2 V to (V+) + 0.2 V - permits high-side current sensing at full rail without external biasing or resistor dividers. |
Pinout & Package
OPA2186DDFR is packaged in an 8-pin SOT-23 (DDF) surface-mount package with exposed pad for thermal performance. Pin numbering follows standard JEDEC SOT-23-8 top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives feedback network or ADC input; rail-to-rail swing (≤10 mV from rails, no load). |
| 2 | –IN A | Inverting input channel A - accepts feedback signal; high-impedance (50 GΩ || 2.5 pF) minimizes loading on precision dividers. |
| 3 | +IN A | Noninverting input channel A - connects to sensor or reference; supports common-mode up to (V+) + 0.2 V. |
| 4 | V– | Negative supply terminal - must be decoupled with 0.1 µF ceramic capacitor placed ≤2 mm from pin. |
| 5 | +IN B | Noninverting input channel B - independent of channel A; enables dual-sensor differential measurement. |
| 6 | –IN B | Inverting input channel B - isolated input path; maintains >100 dB channel separation up to 100 kHz. |
| 7 | OUT B | Amplifier B output - fully independent output stage; capable of sourcing/sinking ±20 mA short-circuit current. |
| 8 | V+ | Positive supply terminal - accepts 4.5–24 V; PSRR of 140 dB (typ) suppresses ripple from noisy DC/DC converters. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Common-mode range extends 200 mV beyond supply rails - eliminates need for external level-shifting in high-side current monitors. |
| Zero-drift architecture | Auto-zeroing with notch filter removes 1/f noise and guarantees <±10 μV total offset over lifetime and temperature. |
| EMI-filtered inputs | Integrated R-C filtering rejects RF interference from Wi-Fi, Bluetooth, or switching power supplies up to 1 GHz. |
| Phase-reversal protection | Prevents output inversion when inputs exceed common-mode limits - ensures safe operation in overvoltage fault conditions. |
| MUX-friendly inputs | Low charge injection (<1 fC) and fast recovery (<10 µs overload recovery) enable stable operation in multiplexed sensor arrays. |
Applications
| High-Side Current Shunt Monitor | Electricity Meter Analog Front-End |
|---|---|
|
Use Scenario: Monitoring battery pack or DC bus current using a 1-mΩ shunt placed between load and positive supply rail. IC Role / Device Role / Timing Role: Precision differential amplifier configured in noninverting mode to measure mV-level shunt voltage with minimal offset error. Use Value: Enables ±0.1% current measurement accuracy over –40°C to +125°C without recalibration, leveraging 0.01 μV/°C drift and rail-to-rail input. |
Use Scenario: Conditioning voltage and current signals from CTs and shunts before 24-bit sigma-delta ADC sampling in Class 0.2 electricity meters. IC Role / Device Role / Timing Role: Low-noise, low-drift signal conditioner providing programmable gain and anti-alias filtering prior to ADC. Use Value: Delivers <125 nVRMS (0.1–10 Hz) and 140 dB CMRR to meet IEC 62053-21 harmonic distortion and linearity requirements. |
| Flow Transmitter Signal Chain | Pressure Transmitter Output Stage |
|
Use Scenario: Amplifying low-level output from ultrasonic or Coriolis flow sensors in industrial process control loops. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with gain = 100, driving 4–20 mA transmitter or SAR ADC. Use Value: 90 µA per amplifier quiescent current extends battery life in wireless flow meters; 750 kHz GBW supports 100-Hz signal bandwidth with margin. |
Use Scenario: Buffering and scaling output of piezoresistive pressure sensors in HVAC or industrial gauges. IC Role / Device Role / Timing Role: Rail-to-rail output driver delivering 0–5 V or 0–10 V analog output compliant with PLC input standards. Use Value: Output swing within 10 mV of rails (no load) ensures full-scale utilization of downstream ADC; 0.35 V/µs slew rate prevents distortion on step changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2182IDR | Higher 5.5 MHz GBW, 220 µA IQ, same 1 μV VOS but 0.03 μV/°C drift - wider bandwidth at higher power cost. | Better for active filters requiring >100 kHz closed-loop bandwidth; less optimal for ultra-low-power battery systems. | Select OPA2182IDR when bandwidth >1 MHz is required and quiescent current budget allows ≥2× increase. |
| LTC2057HMS8#PBF | 0.5 μV VOS, 0.005 μV/°C drift, 1.1 mA IQ, SO-8 package - superior drift spec but 12× higher supply current. | Preferred in lab-grade instruments where drift dominates error budget and power is not constrained. | Choose LTC2057HMS8#PBF only when sub-0.01 μV/°C drift is mandatory and thermal/power design accommodates 1.1 mA per channel. |
Compared with OPA2186DDFR, OPA2182IDR trades 6× higher bandwidth for 2.4× higher quiescent current and relaxed drift control, while LTC2057HMS8#PBF achieves 2× lower drift at 12× higher power - making OPA2186DDFR the optimal balance of micro-power, ultra-low drift, and industrial temperature range in SOT-23-8.
Availability
OPA2186DDFR is available at Aetrix Electronics and suitable for electricity metering, industrial flow transmitters, pressure sensor modules, and high-side current monitoring systems requiring stable component supply across extended temperature and long product lifecycles.
Supply support for OPA2186DDFR 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 amplifiers and signal chain solutions.
The OPAx186 family was designed specifically for high-accuracy, low-power industrial and energy infrastructure applications - including smart meters, process transmitters, and battery management systems - where long-term offset stability and rail-to-rail operation are non-negotiable.
FAQ
What is the maximum operating supply voltage for OPA2186DDFR?
The OPA2186DDFR supports a total supply voltage range of 4.5 V to 24 V (single supply) or ±2.25 V to ±12 V (dual supply). Absolute maximum rating is 26 V across V+ and V– terminals. Exceeding this risks permanent damage. The device maintains specified performance across its full recommended range, including 24-V operation in PC PSU and merchant DC/DC applications cited in TI's official documentation for OPA2186DDFR.
Does OPA2186DDFR support true rail-to-rail input operation?
Yes - OPA2186DDFR supports common-mode input voltages from (V–) – 0.2 V to (V+) + 0.2 V, exceeding both supply rails by 200 mV. This capability is explicitly confirmed in Section 7.3.1 of the SBOS968C datasheet and enables direct high-side current shunt monitoring without external bias networks. The specification applies across –40°C to +125°C and is validated for OPA2186DDFR in the DDF package.
What is the typical input bias current of OPA2186DDFR at 125°C?
At TA = –40°C to +125°C, the input bias current for OPA2186DDFR is specified as ±4.8 nA (max), per Section 6.7 of SBOS968C. This value reflects worst-case performance across temperature and process variation, and is measured under VS = ±12 V conditions. The low bias current preserves accuracy in high-impedance sensor interfaces such as piezoresistive pressure bridges or thermistor networks used with OPA2186DDFR.
Can OPA2186DDFR drive capacitive loads without instability?
OPA2186DDFR is unity-gain stable and can safely drive ≥100 pF capacitive loads with appropriate isolation resistance (e.g., 25 Ω series resistor), as shown in Figure 6-25 and 6-26 of SBOS968C. Phase margin remains >40° up to 1 nF with RISO = 50 Ω. For direct capacitive loads >100 pF, a small series resistor (10–50 Ω) at the output is recommended - a design practice validated for OPA2186DDFR in TI's application curves and layout guidelines.
Is OPA2186DDFR pin-compatible with other devices in the OPAx186 family?
No - OPA2186DDFR (SOT-23-8, DDF) has a different pinout than OPA2186D (SOIC-8) and is not pin-compatible with OPA186 or OPA4186 variants. Table 5-2 in SBOS968C confirms distinct pin assignments for DDF packaging, including dedicated +IN B and –IN B pins on pins 5 and 6. Substituting packages requires PCB layout revision; OPA2186DDFR must be used with its documented DDF pin mapping.
OPA2186DDFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- OPAx186
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- 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:
- 5 pA
- Voltage - Input Offset:
- 1 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:
- TSOT-23-8
OPA2186DDFR FAQ
1.How can I place an order for OPA2186DDFR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2186DDFR 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 OPA2186DDFR reliable?
The price and inventory of OPA2186DDFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2186DDFR is usually 5 days.
3.What payment methods are accepted for OPA2186DDFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2186DDFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2186DDFR?
OPA2186DDFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2186DDFR 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 OPA2186DDFR?
For technical support, including OPA2186DDFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2186DDFR requirements.
6.How does Aetrix verify that OPA2186DDFR is sourced from the original manufacturer or authorized distributors?
All OPA2186DDFR 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 OPA2186DDFR meets industry standards.
7.What is the process for return or replacement of OPA2186DDFR?
All OPA2186DDFR units undergo pre-shipment inspection (PSI). If there is an issue with OPA2186DDFR, 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 OPA2186DDFR part is unused and in its original packaging.
Return procedure for OPA2186DDFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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