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Texas Instruments OPA4205ADT
- Part No.:
- OPA4205ADT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4205ADT.pdf
- Description:
- QUAD, RAIL-TO-RAIL BIPOLAR PRECI
- Quantity:
- Payment:
- Shipping:
Inventory:139
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Product details
Overview
OPA4205ADT from Texas Instruments is a quad-channel, precision bipolar e-trim™ operational amplifier with super-beta inputs, delivering 4 µV typical input offset voltage, ±0.08 µV/°C max drift, and 7.2 nV/√Hz voltage noise density at 1 kHz - optimized for high-accuracy, low-power signal conditioning in battery-powered instrumentation and industrial sensor interfaces.
For engineers reviewing the OPA4205ADT datasheet, OPA4205ADT pinout, OPA4205ADT application, or OPA4205ADT equivalent, key selection criteria include ultra-low drift over –40°C to +125°C, rail-to-rail output swing, 3.6 MHz gain-bandwidth at only 220 µA per amplifier, and EMI/RFI-filtered inputs for robust operation in noisy environments.
Technical Context
The OPA4205ADT implements TI's proprietary e-trim™ technology on a bipolar process to achieve sub-5-µV offset and <0.1 µV/°C drift across temperature, without chopper-induced artifacts. Its super-beta input stage delivers 500 pA max input bias current and 110 fA/√Hz current noise - enabling high-impedance source interfacing without significant error.
It features >126 dB AOL, CMRR, and PSRR over full temperature range, 4 V/µs slew rate, and overload power limiting. The device operates from ±2.25 V to ±18 V (or 4.5 V to 36 V single supply) and supports rail-to-rail output with ±25 mA short-circuit current capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±4 µV typical, ±25 µV max over –40°C to +125°C - enables <1 LSB error in 20-bit systems without calibration |
| Offset Voltage Drift | ±0.08 µV/°C max - ensures <1 µV total drift over 100°C span, critical for uncalibrated field instruments |
| Gain Bandwidth Product | 3.6 MHz - supports stable closed-loop gain ≥10 at 300 kHz with adequate phase margin |
| Quiescent Current | 220 µA per amplifier max - allows four channels to operate below 1 mA total, ideal for portable DAQ |
| Voltage Noise Density | 7.2 nV/√Hz at 1 kHz - preserves SNR in precision amplification of microvolt-level sensor outputs |
| Common-Mode Rejection | ≥124 dB over full temperature - rejects >160 µV of common-mode interference per volt of CM voltage |
| Supply Range | ±2.25 V to ±18 V dual or 4.5 V to 36 V single - compatible with industrial 24 V rails and low-voltage battery systems |
Pinout & Package
OPA4205ADT is packaged in a 14-pin SOIC (D package), with exposed pad not present. Pin layout supports standard quad op-amp routing and thermal dissipation up to 86.5°C/W junction-to-ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 3) | Noninverting input, Channel A | High-impedance node (300 GΩ || 4.4 pF) for precision DC-coupled sensor interface |
| –IN A (Pin 2) | Inverting input, Channel A | Matches +IN A in bias current and impedance; used for transimpedance or difference amplification |
| OUT A (Pin 1) | Output, Channel A | Rail-to-rail capable, drives ≥10 kΩ load within 0.2 V of rails at AOL >126 dB |
| V+ (Pin 4) | Positive supply | Accepts up to +18 V (dual) or +36 V (single); decoupling required within 1 cm for stability |
| V– (Pin 11) | Negative supply | Accepts down to –18 V (dual) or ground (single); shares return path with all four amplifiers |
| +IN B (Pin 5), –IN B (Pin 6) | Inputs, Channel B | Electrically identical to Channel A; independent input stages prevent crosstalk (130 dB dc channel separation) |
| +IN C (Pin 10), –IN C (Pin 9) | Inputs, Channel C | Same performance as A/B; enables simultaneous multi-channel conditioning without inter-channel gain mismatch |
| +IN D (Pin 12), –IN D (Pin 13) | Inputs, Channel D | Full quad independence; all four channels share only V+ and V– supplies |
| OUT B (Pin 7), OUT C (Pin 8), OUT D (Pin 14) | Outputs, Channels B/C/D | Each delivers same drive strength, noise, and settling behavior as OUT A |
Key Features
| Feature | Design Value |
|---|---|
| e-trim™ offset calibration | Eliminates need for external nulling circuitry while maintaining <0.1 µV/°C drift - reduces board area and calibration labor |
| Super-beta input stage | 500 pA max input bias current enables use with >100 MΩ source impedances without significant offset shift |
| EMI/RFI filtered inputs | Integrated filtering suppresses >80 dB of RF interference at 900 MHz - improves reliability in motor-drive or wireless environments |
| Rail-to-rail output | Swings to within 200 mV of either rail under 10 kΩ load - maximizes dynamic range in low-voltage systems |
| Overload power limiter | Prevents thermal runaway during output short-circuit or capacitive overload - enhances system robustness without external protection |
Applications
| Flow Transmitter | Data Acquisition (DAQ) |
|---|---|
Use Scenario: Amplifying low-level differential output from Coriolis or magnetic flow sensors in hazardous-area industrial loops. IC Role / Device Role / Timing Role: Precision front-end gain stage with ultra-low drift and high CMRR to reject pipeline vibration noise and common-mode interference. Use Value: Enables direct 24-bit ADC interface without recalibration over ambient temperature swings, reducing field maintenance. | Use Scenario: Simultaneous analog signal conditioning for multi-channel portable test equipment with battery life constraints. IC Role / Device Role / Timing Role: Quad-channel signal conditioner providing matched gain, offset, and bandwidth across all channels. Use Value: Four independent amplifiers in one SOIC reduce PCB footprint by 75% vs discrete solutions while maintaining channel-to-channel matching <0.1%. |
| Source Measurement Unit (SMU) | Pressure Transmitter |
Use Scenario: High-accuracy current sourcing and voltage sensing in semiconductor parametric testers requiring sub-nA compliance. IC Role / Device Role / Timing Role: Feedback amplifier in precision current-source loop and low-noise voltage sense path. Use Value: 110 fA/√Hz current noise and 7.2 nV/√Hz voltage noise preserve measurement integrity at picoampere levels. | Use Scenario: Conditioning bridge outputs from piezoresistive pressure sensors in automotive and medical devices. IC Role / Device Role / Timing Role: Instrumentation-grade buffer and gain stage with rail-to-rail output for full-scale ADC utilization. Use Value: ±0.08 µV/°C drift ensures <0.05% FS error over –40°C to +125°C without temperature compensation firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4188AIDR | Zero-drift auto-zero architecture; 0.005 µV/°C drift but higher 1/f noise and 550 µA IQ per channel | Better long-term drift stability but unsuitable for low-noise AC-coupled sensor paths due to switching artifacts | Select when ultra-low drift dominates over broadband noise and power; avoid in high-frequency or EMI-sensitive layouts |
| ADA4522-4ARUZ | Zero-drift, 2.5 µV max offset, 0.005 µV/°C drift, 5.8 nV/√Hz noise, 440 µA IQ per channel | Lower noise than OPA4205ADT but higher quiescent current and no EMI filtering - requires external RFI suppression | Prefer for metrology-grade DC accuracy where power and EMI immunity are secondary concerns |
Compared with OPA4205ADT, OPA4188AIDR trades lower drift for higher 1/f noise and power, while ADA4522-4ARUZ offers superior noise and drift but lacks integrated EMI filtering and consumes nearly double the current - making OPA4205ADT optimal for battery-powered, noise-immune, wide-temperature industrial signal chains.
Availability
OPA4205ADT is available at Aetrix Electronics and suitable for flow transmitters, portable data acquisition systems, and source measurement units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA4205ADT 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-amps and industrial signal-chain solutions.
The OPAx205 family was designed specifically for high-accuracy, low-power industrial sensing and test equipment - extending the legacy of the OPAx277 with enhanced e-trim™ performance, super-beta inputs, and robust EMI immunity.
FAQ
What is the maximum operating temperature range for the OPA4205ADT?
The OPA4205ADT is rated for continuous operation from –40°C to +125°C ambient temperature, with guaranteed electrical performance including ±25 µV max input offset voltage and ±0.08 µV/°C max drift across this full range - validated per TI's production test conditions in SBOS962F Rev F.
Does the OPA4205ADT support single-supply operation?
Yes, the OPA4205ADT supports true single-supply operation from 4.5 V to 36 V. Its rail-to-rail output stage delivers full swing from V– (typically ground) to V+, and its input common-mode range extends to within 1 V of either rail - enabling direct interfacing with 3.3 V or 5 V microcontrollers and ADCs.
How does the e-trim™ technology in the OPA4205ADT differ from zero-drift auto-zero op-amps?
The OPA4205ADT uses bipolar e-trim™ trimming to permanently adjust input offset during wafer sort, eliminating 1/f noise and switching artifacts inherent in auto-zero architectures. Unlike zero-drift op-amps, OPA4205ADT provides smooth, continuous-time response with 7.2 nV/√Hz broadband noise and no idle-tone or clock feedthrough - critical for precision AC signal paths.
Can the OPA4205ADT drive capacitive loads without instability?
The OPA4205ADT is stable driving ≥25 pF capacitive loads with 10 kΩ series resistance (per Figure 6-34), but direct capacitive loading >100 pF may cause peaking or oscillation. For heavy capacitive loads (e.g., long cables or ADC inputs), TI recommends adding a 20–100 Ω isolation resistor in series with the output - verified in SBOS962F Section 9.4.
Is the OPA4205ADT pin-compatible with other quad op-amps like the OPA4177 or OPA4188?
No, the OPA4205ADT is not pin-compatible with OPA4177 or OPA4188. It uses a unique 14-pin SOIC pinout (D package) with dedicated V+ (Pin 4) and V– (Pin 11), whereas OPA4177 uses 14-pin SOIC with V+ at Pin 13 and V– at Pin 4. Layout redesign is required for substitution - refer to Figure 5-3 and Table 5-3 in SBOS962F.
OPA4205ADT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- e-trim™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 4V/µs
- Gain Bandwidth Product:
- 3.6 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 100 pA
- Voltage - Input Offset:
- 4 µV
- Current - Supply:
- 220µA
- Current - Output / Channel:
- 25 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:
- 14-SOIC
OPA4205ADT FAQ
1.How can I place an order for OPA4205ADT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4205ADT 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 OPA4205ADT reliable?
The price and inventory of OPA4205ADT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4205ADT is usually 5 days.
3.What payment methods are accepted for OPA4205ADT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4205ADT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4205ADT?
OPA4205ADT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4205ADT 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 OPA4205ADT?
For technical support, including OPA4205ADT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4205ADT requirements.
6.How does Aetrix verify that OPA4205ADT is sourced from the original manufacturer or authorized distributors?
All OPA4205ADT 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 OPA4205ADT meets industry standards.
7.What is the process for return or replacement of OPA4205ADT?
All OPA4205ADT units undergo pre-shipment inspection (PSI). If there is an issue with OPA4205ADT, 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 OPA4205ADT part is unused and in its original packaging.
Return procedure for OPA4205ADT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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