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Texas Instruments OPA4205ADR
- Part No.:
- OPA4205ADR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4205ADR.pdf
- Description:
- QUAD, RAIL-TO-RAIL BIPOLAR PRECI
- Quantity:
- Payment:
- Shipping:
Inventory:2,908
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Product details
Overview
OPA4205ADR 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 OPA4205ADR datasheet, OPA4205ADR pinout, OPA4205ADR application, or OPA4205ADR equivalent, this page provides verified specifications, SOIC-14 package layout, rail-to-rail output behavior, EMI-filtered inputs, and validated alternatives for flow transmitters, DAQ systems, and source measurement units.
Technical Context
The OPA4205ADR implements TI's proprietary e-trim™ technology on a bipolar process to achieve ultra-low offset and drift without chopper-induced artifacts. Its super-beta input stage delivers 100 pA typical input bias current and 110 fA/√Hz current noise density, enabling high-impedance sensor interfacing without significant error sources.
With 3.6 MHz gain-bandwidth product, 4 V/µs slew rate, and >126 dB AOL/CMRR/PSRR across –40°C to +125°C, it supports stable closed-loop operation in precision DC-coupled and low-frequency AC applications while maintaining 220 µA per-amplifier quiescent current at ±5 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±4 µV typical (±25 µV max over temp) - enables sub-16-bit accuracy in 24-bit DAQ front-ends without calibration. |
| Offset Drift | ±0.08 µV/°C max - ensures <1 µV total drift over 100°C range, critical for uncalibrated field instrumentation. |
| Gain Bandwidth | 3.6 MHz - supports stable unity-gain buffering of signals up to ~300 kHz with minimal phase lag. |
| Quiescent Current | 220 µA per amplifier (max 240 µA) - allows four independent channels in <1 mA total supply current for portable SMUs. |
| Voltage Noise | 7.2 nV/√Hz at 1 kHz; 0.2 µVPP (0.1–10 Hz) - preserves SNR in low-frequency sensor amplification (e.g., strain gauges, thermopiles). |
| Supply Range | ±2.25 V to ±18 V (or 4.5 V to 36 V single) - accommodates industrial 24 V rails and battery-powered 5 V/3.3 V systems. |
| Output Swing | Rail-to-rail into 10 kΩ load (within 200 mV of rails) - maximizes dynamic range when using low-voltage ADCs. |
Pinout & Package
OPA4205ADR is packaged in a 14-pin SOIC (D package), with four fully independent op-amp channels sharing common power pins. The layout supports compact, low-noise PCB routing with dedicated V+ (pin 4) and V– (pin 11) rails and no internal connections on unused pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (pin 3) | Noninverting input, channel A | High-impedance node (300 GΩ || 4.4 pF) for precision sensor voltage sensing. |
| –IN A (pin 2) | Inverting input, channel A | Used for feedback configuration; matched input impedance minimizes CM error. |
| OUT A (pin 1) | Output, channel A | Capable of driving ≥10 kΩ loads rail-to-rail; short-circuit protected (±25 mA). |
| +IN B (pin 5) | Noninverting input, channel B | Independent input for differential pair or multi-channel signal conditioning. |
| –IN B (pin 6) | Inverting input, channel B | Supports dual-opamp configurations like inverting summing or I/V conversion. |
| OUT B (pin 7) | Output, channel B | Electrically isolated from OUT A; enables simultaneous analog processing paths. |
| +IN C (pin 10) | Noninverting input, channel C | Enables three-channel monitoring (e.g., voltage, current, temperature) in one IC. |
| –IN C (pin 9) | Inverting input, channel C | Allows active filtering or gain-setting without external components in compact layouts. |
| OUT C (pin 8) | Output, channel C | Optimized for low THD+N (0.0004% @ 1 kHz) in precision analog output stages. |
| +IN D (pin 12) | Noninverting input, channel D | Supports fourth independent signal path - e.g., reference buffer or guard drive. |
| –IN D (pin 13) | Inverting input, channel D | Enables matched gain stages across all four channels for system-level calibration. |
| OUT D (pin 14) | Output, channel D | Delivers same performance as other outputs: 4 V/µs slew, 3.6 MHz GBW, low noise. |
| V+ (pin 4) | Positive supply | Shared rail for all four amplifiers; decoupling recommended within 1 cm of pin. |
| V– (pin 11) | Negative supply | Shared return; low-impedance ground plane essential to maintain PSRR >126 dB. |
Key Features
| Feature | Design Value |
|---|---|
| e-trim™ architecture | Eliminates laser trimming; achieves ±4 µV offset and ±0.08 µV/°C drift without aging-related drift or 1/f noise spikes. |
| Super-beta input stage | 100 pA typical input bias current enables direct connection to high-Z sources (e.g., pH electrodes, piezoresistive sensors) without guard rings. |
| Rail-to-rail output | Swings within 200 mV of rails into 10 kΩ, preserving full ADC input range in 3.3 V or 5 V systems. |
| EMI/RFI filtered inputs | Integrated RC filtering rejects >80 dB of 900 MHz cellular interference - critical for field-deployed instrumentation. |
| Overload power limiter | Prevents thermal runaway during output short-circuit or capacitive overload, ensuring robustness in automated test equipment. |
| Wide temperature range | Specified from –40°C to +125°C with no derating - suitable for under-hood automotive and industrial control environments. |
Applications
| Flow Transmitter | Data Acquisition (DAQ) |
|---|---|
Use Scenario: Amplifying low-level mV signals from Coriolis or magnetic flow sensors in harsh industrial environments. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with ultra-low drift and EMI rejection. Use Value: Maintains ±0.1% flow accuracy over temperature without recalibration, enabled by <1 µV total offset drift. |
Use Scenario: Simultaneous analog signal conditioning for multi-channel 24-bit sigma-delta ADCs in portable lab equipment. IC Role / Device Role / Timing Role: Quad-channel programmable-gain amplifier (PGA) core with matched gain and offset. Use Value: Four independent, low-noise channels reduce board area by 60% vs discrete solutions while preserving channel-to-channel isolation >130 dB. |
| Source Measurement Unit (SMU) | Pressure Transmitter |
Use Scenario: High-density SMU modules requiring four-quadrant sourcing and picoampere-level current measurement. IC Role / Device Role / Timing Role: Feedback amplifier for TIA and voltage-controlled current source with ultra-low IB and IOS. Use Value: Enables 100 pA minimum measurable current with <0.5% error, leveraging 110 fA/√Hz current noise and 300 GΩ input impedance. |
Use Scenario: Signal conditioning for piezoresistive bridge sensors in HVAC and process control transmitters. IC Role / Device Role / Timing Role: Low-drift bridge amplifier with rail-to-rail output driving 4–20 mA loop drivers. Use Value: Delivers <0.05% FS linearity error over –40°C to +85°C, supported by ±0.08 µV/°C drift and 126 dB CMRR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4188IDR | Zero-drift auto-zero topology; 0.005 µV/°C drift but higher 1/f noise and 550 µA IQ per amp. | Better long-term stability in DC-coupled integrators; less suitable for low-power battery operation. | Choose OPA4188IDR only if sub-µV/°C drift dominates over power and noise requirements. |
| AD8629ARZ-REEL7 | CMOS input; 1 pA IB (vs 500 pA max for OPA4205ADR); 0.1 µV/°C drift; 1.2 MHz GBW. | Lower input current benefits ultra-high-Z photodiode amps; lower bandwidth limits high-speed DAQ use. | Select AD8629ARZ-REEL7 when input bias current is the primary constraint and bandwidth <1.2 MHz suffices. |
Compared with OPA4205ADR, OPA4188IDR trades 10× lower drift for 2.5× higher quiescent current and increased 1/f noise, while AD8629ARZ-REEL7 offers femtoampere input bias at the cost of bandwidth and offset voltage (25 µV max), making OPA4205ADR optimal for balanced precision, speed, and power in industrial sensor signal chains.
Availability
OPA4205ADR is available at Aetrix Electronics and suitable for flow transmitters, data acquisition systems, and source measurement units requiring stable component supply, long-term manufacturability, and guaranteed traceability through TI's extended product lifecycle program.
Supply support for OPA4205ADR 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 innovation in precision amplifiers and signal chain solutions.
The OPAx205 family was designed specifically for high-accuracy, low-power industrial and test equipment applications - succeeding the OPAx277 series with enhanced e-trim™ performance, super-beta inputs, and extended temperature operation.
FAQ
What is the maximum operating temperature range for the OPA4205ADR?
The OPA4205ADR is specified for continuous operation from –40°C to +125°C, with all key parameters - including input offset voltage drift (±0.08 µV/°C max), open-loop gain (>126 dB), and PSRR (>126 dB) - guaranteed across this full industrial temperature range. This makes OPA4205ADR suitable for under-hood automotive sensors and factory-floor control systems where ambient temperatures exceed 85°C.
Does the OPA4205ADR support single-supply operation?
Yes, the OPA4205ADR supports true single-supply operation from 4.5 V to 36 V. Its rail-to-rail output stage swings within 200 mV of both supply rails into 10 kΩ loads, and its input common-mode range extends from (V–) + 1 V to (V+) – 1.4 V - enabling direct interfacing with microcontroller ADCs and DACs powered from the same 3.3 V or 5 V rail. The OPA4205ADR maintains full specification compliance in single-supply mode.
How does the e-trim™ technology in the OPA4205ADR differ from traditional laser trimming?
OPA4205ADR uses TI's monolithic e-trim™ process - an integrated circuit-level trimming method that eliminates post-package laser trimming. This results in superior long-term stability (<0.05 µV/√khr drift), no trim-pad parasitics, and immunity to mechanical stress-induced offset shifts. Unlike laser-trimmed devices, OPA4205ADR achieves ±4 µV typical offset without compromising input capacitance or bandwidth, and avoids the reliability risks associated with laser-ablated metal traces.
Can the OPA4205ADR drive capacitive loads without instability?
The OPA4205ADR is stable for capacitive loads up to 30 pF with 10 kΩ load resistance, as confirmed by phase margin measurements (≥58° at ±15 V). For larger loads, external isolation resistors (e.g., 10–50 Ω in series with the output) are recommended. The device includes an overload power limiter to prevent thermal damage during sustained capacitive overload, and its EMI-filtered inputs further suppress high-frequency oscillation triggers in noisy environments.
Is the OPA4205ADR pin-compatible with other quad op-amps in SOIC-14 packages?
No - the OPA4205ADR has a unique pinout optimized for four independent amplifiers with shared V+ (pin 4) and V– (pin 11), differing from industry-standard quad op-amp layouts (e.g., LM324, TL074). Substituting OPA4205ADR requires PCB redesign. However, its functional equivalence to OPA4205A (standard grade) means OPA4205ADR can replace OPA4205A in existing designs without layout changes, as both share identical pin mapping and electrical specs.
OPA4205ADR 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
OPA4205ADR FAQ
1.How can I place an order for OPA4205ADR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4205ADR 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 OPA4205ADR reliable?
The price and inventory of OPA4205ADR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4205ADR is usually 5 days.
3.What payment methods are accepted for OPA4205ADR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4205ADR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4205ADR?
OPA4205ADR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4205ADR 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 OPA4205ADR?
For technical support, including OPA4205ADR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4205ADR requirements.
6.How does Aetrix verify that OPA4205ADR is sourced from the original manufacturer or authorized distributors?
All OPA4205ADR 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 OPA4205ADR meets industry standards.
7.What is the process for return or replacement of OPA4205ADR?
All OPA4205ADR units undergo pre-shipment inspection (PSI). If there is an issue with OPA4205ADR, 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 OPA4205ADR part is unused and in its original packaging.
Return procedure for OPA4205ADR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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