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Texas Instruments OPA4186DR
- Part No.:
- OPA4186DR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4186DR.pdf
- Description:
- QUAD, 24-V, LOW-POWER (90-A) 5-V
- Quantity:
- Payment:
- Shipping:
Inventory:2,438
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Product details
Overview
OPA4186DR from Texas Instruments is a quad-channel, rail-to-rail input/output, zero-drift operational amplifier optimized for precision signal conditioning in 4.5 V to 24 V systems. It delivers 1 μV max offset voltage, 0.025 μV/°C max drift over –40°C to +125°C, and 750 kHz gain bandwidth - enabling high-accuracy current sensing, sensor front-ends, and metering applications where long-term stability and low power are critical.
For engineers reviewing the OPA4186DR datasheet, OPA4186DR pinout, OPA4186DR application, or OPA4186DR equivalent, this page provides verified specifications, SOIC-14 package details, channel-separated pin functions, and validated alternatives for precision analog design in industrial and energy measurement systems.
Technical Context
The OPA4186DR implements a proprietary auto-zero/chopper-stabilized architecture with dual-stage correction, delivering near-zero drift without flicker noise penalty. Its rail-to-rail input stage supports common-mode voltages extending 200 mV beyond supply rails, while the output swings within 5 mV of rails under no load - critical for single-supply high-side shunt monitoring.
Each of its four amplifiers features independent input bias current paths (<±6.2 nA at +125°C), 120 dB min CMRR at ±12 V, and robust EMI filtering on both inputs. The device is unity-gain stable and MUX-friendly, supporting multiplexed sensor arrays without settling-time degradation or phase reversal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | ±6 μV (max) - enables sub-0.01% error in 100-mV full-scale current-sense applications without calibration. |
| Offset Drift | ±0.025 μV/°C (max) - ensures <±0.5 μV total drift across –40°C to +125°C, eliminating thermal recalibration. |
| 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 battery-powered meters. |
| Quiescent Current | 90 μA per amplifier - allows four-channel precision amplification in <400-μA total system budget for portable instrumentation. |
| Gain Bandwidth | 750 kHz - sufficient for DC–100-Hz sensor signals with >60-dB closed-loop gain margin at 10 Hz. |
| Input Common-Mode Range | (V–) – 0.2 V to (V+) + 0.2 V - permits high-side current sensing at positive rail without level-shifting circuitry. |
| Output Swing | Within 5 mV of rails (no load) - maximizes dynamic range in 3.3-V or 5-V ADC interfaces with rail-to-rail input ADCs. |
Pinout & Package
OPA4186DR is packaged in a 14-pin SOIC (D package) with exposed pad option not specified. Pin numbering follows standard top-view orientation with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives feedback network or ADC input; rail-to-rail capable with 20-mA short-circuit rating. |
| 2 | –IN A | Inverting input channel A - accepts differential or single-ended feedback; immune to phase reversal beyond rail limits. |
| 3 | +IN A | Noninverting input channel A - supports high-impedance sensor connections; RFI-filtered for EMI resilience. |
| 4 | V+ | Positive supply - connects to main system rail (e.g., 24 V or 5 V); requires local 0.1-μF decoupling. |
| 5 | +IN B | Noninverting input channel B - electrically isolated from channel A; enables independent dual-sensor conditioning. |
| 6 | –IN B | Inverting input channel B - matched offset and drift to channel A; supports identical external resistor networks. |
| 7 | OUT B | Amplifier B output - fully independent output stage; no crosstalk with channels A/C/D per Figure 6-39 (≥120 dB @ 1 kHz). |
| 8 | OUT C | Amplifier C output - identical AC/DC specs to OUT A/B; supports multi-channel transducer signal chains. |
| 9 | –IN C | Inverting input channel C - shares same input structure as A/B; validated for MUX-driven sequential sampling. |
| 10 | +IN C | Noninverting input channel C - supports common-mode voltage up to V+ + 0.2 V; suitable for high-side biasing. |
| 11 | V– | Negative supply - connects to system ground or negative rail; must be decoupled within 5 mm of pin. |
| 12 | +IN D | Noninverting input channel D - fourth independent input; enables 4-sensor simultaneous readout in flow/pressure meters. |
| 13 | –IN D | Inverting input channel D - matched performance to other channels; supports programmable gain via external resistors. |
| 14 | OUT D | Amplifier D output - completes quad-channel set; settles in 7.5 μs to 0.1% for step responses in metering firmware loops. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input beyond supply rails | Accepts common-mode voltage up to (V–) – 0.2 V and (V+) + 0.2 V - eliminates need for external level shifters in high-side current sensing. |
| No phase reversal | Output clamps to appropriate rail instead of inverting when input exceeds linear range - prevents control-loop instability in closed-loop systems. |
| MUX-friendly architecture | Settles in ≤7.5 μs to 0.1% after channel switching - enables accurate time-division multiplexing of 4× sensors without guard-band delays. |
| EMI/RFI filtered inputs | Integrated input filtering rejects GSM, Wi-Fi, and switching regulator noise above 10 MHz - improves SNR in noisy industrial environments. |
| Zero-drift chopper stabilization | Eliminates 1/f noise and achieves <0.1 μV peak-to-peak 0.1–10 Hz noise - essential for high-resolution weigh scale and strain gauge amplifiers. |
Applications
| Electricity Meter Front-End | High-Side Current Shunt Monitor |
|---|---|
|
Use Scenario: Precise measurement of line current in Class 0.2 electricity meters using shunt resistors at 24-V bus. IC Role / Device Role / Timing Role: Quad amplifier conditions four-phase current signals simultaneously, each configured as a noninverting gain stage with matched resistors. Use Value: ±6 μV offset ensures <0.005% gain error contribution at 100-mV shunt drop; 0.025 μV/°C drift avoids thermal recalibration across operating temperature. |
Use Scenario: Monitoring battery charge/discharge current in merchant battery chargers with 24-V input and isolated MCU interface. IC Role / Device Role / Timing Role: Single channel used in high-side configuration with V+ referenced to battery positive terminal; remaining channels condition voltage and temperature. Use Value: Rail-to-rail input extends to V+ + 0.2 V, enabling direct connection to shunt without level-shifter ICs or additional op-amps. |
| Flow Transmitter Signal Conditioning | Pressure Transmitter Analog Output |
|
Use Scenario: Amplifying low-level mV outputs from turbine or Coriolis flow sensors in industrial process control systems. IC Role / Device Role / Timing Role: Two channels implement programmable-gain instrumentation amplifier topology; third and fourth buffer reference and excitation. Use Value: 750-kHz GBW supports fast response to flow transients; 90-μA quiescent current enables operation from loop-powered 4–20 mA interfaces. |
Use Scenario: Converting bridge output from piezoresistive pressure sensors into calibrated 0–5 V or 4–20 mA output in HVAC and industrial gauges. IC Role / Device Role / Timing Role: One channel performs ratiometric amplification referenced to bridge excitation; others condition temperature compensation signals. Use Value: 120 dB CMRR rejects common-mode noise from shared power supplies; 0.35 V/μs slew rate handles step changes in pressure without distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4182DR | Higher offset drift (±0.03 μV/°C), higher IQ (125 μA), no EMI filtering - uses auto-zero only, no chopper modulation. | Better for ultra-low-noise DC applications where EMI immunity is secondary; less suitable for wireless-adjacent or switch-mode power environments. | Select OPA4182DR only if lower 1/f noise is prioritized over EMI rejection and supply current is not constrained. |
| LTC2057HMS8#PBF | Single-channel, 14-pin MSOP; ±0.5 μV offset, ±0.005 μV/°C drift, but 175-μA IQ and no rail-to-rail input - requires external level shifting. | Preferred for ultra-high-precision single-channel lab equipment; unsuitable for space-constrained quad-sensor systems or high-side sensing. | Choose LTC2057HMS8#PBF only when absolute lowest drift dominates layout area and supply constraints. |
Compared with OPA4186DR, OPA4182DR trades EMI immunity and lower IQ for marginally better noise floor, while LTC2057HMS8#PBF offers superior drift but lacks integration, rail-to-rail input, and quad-channel density - making OPA4186DR optimal for compact, noise-resilient, multi-sensor industrial metering.
Availability
OPA4186DR is available at Aetrix Electronics and suitable for electricity metering, flow transmitter design, and high-side current monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA4186DR 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 sensing - targeting electricity meters, process transmitters, and battery-powered instrumentation where zero-drift stability and rail-to-rail operation are mandatory.
FAQ
What is the maximum operating temperature range for the OPA4186DR?
The OPA4186DR is rated for continuous operation from –40°C to +125°C ambient temperature. All key specifications - including offset voltage drift (±0.025 μV/°C max), CMRR (≥100 dB), and quiescent current (≤150 μA) - are guaranteed across this full industrial temperature range, making it suitable for harsh-environment metering and automotive-adjacent industrial applications.
Does the OPA4186DR require external capacitors for stability?
No, the OPA4186DR is unity-gain stable and does not require external compensation capacitors. However, TI recommends placing a 0.1-μF ceramic capacitor between V+ and V– pins, located within 5 mm of the device, to suppress supply noise and ensure robust EMI performance - especially critical in 24-V industrial systems with switching regulators.
Can the OPA4186DR be used in high-side current sensing configurations?
Yes, the OPA4186DR supports true high-side current sensing because its rail-to-rail input stage accepts common-mode voltages up to (V+) + 0.2 V. This allows direct connection to the positive terminal of a shunt resistor without level-shifting circuitry - a capability confirmed in the "High-Side Current Shunt Monitor Application" diagram (Figure 1) and validated by input voltage range specification in Section 6.7.
How does the OPA4186DR handle electromagnetic interference (EMI)?
The OPA4186DR integrates dedicated RFI/EMI filtering on both inputs, explicitly documented in Section 1 Features and Section 7.3.4. This filtering significantly attenuates interference from GSM, Wi-Fi, and switching power supplies - demonstrated by EMIRR test data in Figure 6-38 (≥100 dB rejection at 100 MHz) - ensuring reliable operation in dense PCB layouts with mixed analog/digital content.
Is the OPA4186DR pin-compatible with other devices in the OPAx186 family?
No - the OPA4186DR (14-pin SOIC) is not pin-compatible with OPA186 (8-pin SOIC/SOT-23) or OPA2186 (8-pin SOIC/SOT-23). Each variant has distinct pin counts and assignments; Table 5-3 confirms the 14-pin layout is unique to the quad version. Migration requires PCB redesign, though schematic topology and external component values remain consistent across the family.
OPA4186DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 4
- 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:
- 6 µV
- Current - Supply:
- 90µA (x4 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:
- 14-SOIC
OPA4186DR FAQ
1.How can I place an order for OPA4186DR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4186DR 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 OPA4186DR reliable?
The price and inventory of OPA4186DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4186DR is usually 5 days.
3.What payment methods are accepted for OPA4186DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4186DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4186DR?
OPA4186DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4186DR 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 OPA4186DR?
For technical support, including OPA4186DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4186DR requirements.
6.How does Aetrix verify that OPA4186DR is sourced from the original manufacturer or authorized distributors?
All OPA4186DR 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 OPA4186DR meets industry standards.
7.What is the process for return or replacement of OPA4186DR?
All OPA4186DR units undergo pre-shipment inspection (PSI). If there is an issue with OPA4186DR, 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 OPA4186DR part is unused and in its original packaging.
Return procedure for OPA4186DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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