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Texas Instruments OPA2705UAG4
- Part No.:
- OPA2705UAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2705UAG4.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,854
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Product details
Overview
OPA2705UAG4 from Texas Instruments is a dual, rail-to-rail input/output CMOS operational amplifier optimized for low-power, precision signal conditioning in single- or dual-supply systems. It delivers 1MHz gain-bandwidth, 0.6V/µs slew rate, 0.5mV max input offset voltage, 160µA quiescent current per amplifier, and operates from ±2V to ±6V (or 4V–12V single supply), serving as a key front-end buffer in data acquisition and sensor interface circuits.
For engineers reviewing the OPA2705UAG4 datasheet, OPA2705UAG4 pinout, OPA2705UAG4 application, or OPA2705UAG4 equivalent, this page provides verified package mapping (SOIC-8), confirmed dual-amplifier topology, rail-to-rail I/O behavior, thermal performance at +85°C, and design-meaningful parameter context - all directly extracted from TI's SBOS182A production datasheet and packaging addendum.
Technical Context
The OPA2705UAG4 integrates two independent amplifiers sharing a common SOIC-8 package, each featuring complementary N- and P-channel input stages enabling rail-to-rail input swing extending 300mV beyond supply rails. Its class AB output stage achieves 40mV rail-to-rail output swing into 100kΩ loads while maintaining >100dB open-loop gain.
Designed for unity-gain stability, it supports capacitive loads up to 1000pF and exhibits no phase inversion when inputs exceed supplies-provided input current is limited to ≤10mA via series resistance. PSRR and CMRR are specified over temperature with distinct "full-scale" and "limited-range" modes tied to common-mode voltage positioning relative to supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1MHz - enables stable unity-gain buffering of signals up to ~100kHz with <0.1% gain error |
| Slew Rate | 0.6V/µs - supports 10Vpp output at 10kHz without slew-induced distortion |
| Input Offset Voltage | ±0.5mV (max) - ensures ≤0.01% error in 5V full-scale 16-bit DAC reference buffering |
| Quiescent Current | 160µA per amplifier - allows dual-channel operation on <330µA total, ideal for battery-powered sensors |
| Rail-to-Rail I/O | Input extends (V−)−0.3V to (V+) +0.3V; output swings within 40mV of rails - preserves dynamic range in 3.3V or 5V systems |
| CMRR (Limited Range) | 96dB - maintains accuracy when common-mode voltage stays >2V below V+, critical in single-supply transducer amps |
| Input Bias Current | 1pA (typ) - minimizes voltage error across high-impedance sources like pH electrodes or photodiodes |
Pinout & Package
OPA2705UAG4 is housed in an 8-pin SOIC (D package), RoHS-compliant, moisture sensitivity level 2, rated for −40°C to +85°C operation. Pin 1 is marked with a beveled corner or dot; device marking reads "OPA 2705UA".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input A | High-impedance node for feedback network connection; accepts signals from (V−)−0.3V to (V+)+0.3V |
| 2 | Non-Inverting Input A | Reference or sensor signal input; same rail-to-rail common-mode range as Pin 1 |
| 3 | Output A | Class AB output capable of sourcing/sinking ±10mA; swings to within 40mV of rails into 100kΩ |
| 4 | V− | Negative supply rail; must be bypassed with 1µF tantalum + 1000pF ceramic for stability |
| 5 | Non-Inverting Input B | Second amplifier input; electrically isolated from Channel A; identical specs and voltage range |
| 6 | Inverting Input B | Feedback node for Channel B; shares same ESD protection and bias current specs as Pin 1 |
| 7 | Output B | Independent output; no crosstalk specification given, but channel separation is ≥98dB at dc |
| 8 | V+ | Positive supply rail; supports 4V–12V single or ±2V–±6V dual operation |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of supply voltage headroom in low-voltage systems (e.g., 3.3V ADC drivers), reducing need for level-shifting circuitry |
| 160µA quiescent current per amplifier | Supports always-on dual-channel signal conditioning in portable equipment with <330µA total supply current |
| 1pA typical input bias current | Permits direct interfacing with ultra-high-impedance sources (e.g., piezoelectric sensors, glass pH electrodes) without significant offset drift |
| No phase inversion on overvoltage | Eliminates risk of latch-up or signal corruption when sensor transients exceed rails-provided input current is limited to ≤10mA |
| Unity-gain stable with 1000pF capacitive load drive | Allows direct connection to ADC input capacitors or long PCB traces without external compensation components |
Applications
| Automotive Sensor Interface | Portable Data Acquisition |
|---|---|
Use Scenario: Amplifying low-level signals from MEMS accelerometers or thermistor-based cabin temperature sensors in 5V automotive body control modules. IC Role / Device Role / Timing Role: Dual-channel rail-to-rail op amp providing buffered, low-drift gain stages for analog front-end signal conditioning prior to 12-bit SAR ADC sampling. Use Value: 0.5mV offset and 1pA bias current minimize calibration burden; rail-to-rail I/O maximizes SNR in 5V system without negative supply generation. | Use Scenario: Battery-powered handheld multimeter acquiring voltage, current, and resistance measurements with auto-ranging and digital display. IC Role / Device Role / Timing Role: Dual amplifier performing simultaneous high-impedance voltage sensing and shunt-based current measurement amplification. Use Value: 160µA per amplifier enables >100-hour battery life on two AA cells; SOIC-8 footprint simplifies layout in space-constrained handheld enclosures. |
| Transducer Signal Conditioning | Active Filter for Test Equipment |
Use Scenario: Signal conditioning for industrial pressure transducers with mV/V output, requiring gain, offset trim, and noise filtering before digitization. IC Role / Device Role / Timing Role: First-stage instrumentation-grade amplifier with rail-to-rail output driving anti-aliasing filter and 16-bit sigma-delta ADC. Use Value: 96dB limited-range CMRR rejects common-mode noise from 4–20mA loop coupling; 1MHz GBW supports filter cutoffs up to 100kHz. | Use Scenario: Second-order Sallen-Key low-pass filter in benchtop function generator output stage, shaping waveform fidelity up to 100kHz. IC Role / Device Role / Timing Role: Unity-gain stable op amp implementing active filter topology with precise pole placement and minimal phase shift. Use Value: 0.6V/µs slew rate prevents distortion on 10Vpp 10kHz sine waves; SOIC-8 allows compact dual-filter implementation (LPF + HPF). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2333AIDR | Zero-drift architecture; 0.02µV/°C offset drift vs. OPA2705UAG4's ±4µV/°C; higher 350µA IQ | Better for DC-critical applications (e.g., precision weigh scales); less suitable for battery-constrained designs | Select OPA2333AIDR only if microvolt-level drift over temperature is required and power budget allows +200µA per channel |
| MCP6022-I/SN | Lower 170kHz GBW; 2.3V–5.5V supply range only; 100pA IB vs. 1pA; 3mV VOS max | Targeted at cost-sensitive 3.3V embedded systems; insufficient for 12V sensor interfaces or low-offset requirements | Choose MCP6022-I/SN for non-critical 3.3V applications where cost outweighs precision; avoid for automotive or 16-bit DAQ |
Compared with OPA2705UAG4, OPA2333AIDR trades 200µA higher quiescent current for near-zero drift, while MCP6022-I/SN sacrifices bandwidth, offset, and rail-swing capability to reduce cost-making OPA2705UAG4 the balanced choice for general-purpose dual-channel rail-to-rail amplification at moderate speed and precision.
Availability
OPA2705UAG4 is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable data acquisition systems, transducer signal conditioning, and active filter designs requiring stable component supply, consistent parametric performance, and long-term industrial temperature support (−40°C to +85°C).
Supply support for OPA2705UAG4 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, embedded processing, and connectivity technologies, with decades of expertise in precision op amp design and manufacturing.
The OPA705 family-including OPA2705UAG4-is engineered for cost-sensitive, low-power applications demanding rail-to-rail I/O, sub-millivolt offset, and robust operation across automotive and industrial temperature ranges.
FAQ
What is the maximum supply voltage rating for OPA2705UAG4?
The absolute maximum supply voltage for OPA2705UAG4 is 13.2V between V+ and V− pins. Continuous operation is specified from ±2V to ±6V dual supply (or 4V–12V single supply). Exceeding 13.2V risks permanent damage per TI's SBOS182A absolute maximum ratings table. Derating is recommended above 12V for reliability in extended-temperature applications.
Does OPA2705UAG4 support true rail-to-rail input when powered from a 3.3V single supply?
Yes, OPA2705UAG4 supports rail-to-rail input down to 3.3V single supply: its input common-mode range extends (V−) −0.3V to (V+) +0.3V, meaning it accepts signals from −0.3V to +3.6V. However, output swing is limited to within 40mV of rails into light loads; for full 0–3.3V output, ensure load impedance ≥100kΩ per SBOS182A typical performance curves.
Can OPA2705UAG4 drive a 1000pF capacitive load in unity-gain configuration without oscillation?
Yes, OPA2705UAG4 is characterized to drive up to 1000pF capacitive load stably in unity-gain configuration, as confirmed in SBOS182A Typical Characteristics. For marginal cases, TI recommends adding a 10Ω–20Ω series resistor inside the feedback loop (between output and inverting input) to suppress ringing while preserving DC accuracy-per Figure 5 in the datasheet.
What is the thermal resistance θJA for OPA2705UAG4 in SOIC-8 package?
The junction-to-ambient thermal resistance (θJA) for OPA2705UAG4 in SOIC-8 (D package) is 150°C/W, as specified in SBOS182A Electrical Characteristics table. This value assumes standard JEDEC 2-layer board conditions; actual θJA may improve with enhanced copper pour or thermal vias in production layouts.
Is OPA2705UAG4 pin-compatible with other dual op amps in SOIC-8 package, such as LM358 or TLV2462?
No, OPA2705UAG4 is not pin-compatible with LM358 or TLV2462. While all use SOIC-8, OPA2705UAG4 follows TI's standard dual-op-amp pinout (V− on Pin 4, V+ on Pin 8), whereas LM358 places V+ on Pin 8 but uses different input/output assignments (e.g., Output A on Pin 1, not Pin 3). Always verify pin functions using the OPA2705UAG4-specific schematic diagram in SBOS182A.
OPA2705UAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.6V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 160µA (x2 Channels)
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA2705UAG4 FAQ
1.How can I place an order for OPA2705UAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2705UAG4 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 OPA2705UAG4 reliable?
The price and inventory of OPA2705UAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2705UAG4 is usually 5 days.
3.What payment methods are accepted for OPA2705UAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2705UAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2705UAG4?
OPA2705UAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2705UAG4 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 OPA2705UAG4?
For technical support, including OPA2705UAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2705UAG4 requirements.
6.How does Aetrix verify that OPA2705UAG4 is sourced from the original manufacturer or authorized distributors?
All OPA2705UAG4 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 OPA2705UAG4 meets industry standards.
7.What is the process for return or replacement of OPA2705UAG4?
All OPA2705UAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2705UAG4, 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 OPA2705UAG4 part is unused and in its original packaging.
Return procedure for OPA2705UAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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