My Inquiry
My Account
Texas Instruments OPA2705UA
- Part No.:
- OPA2705UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2705UA.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:675
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA2705UA 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, and 160µA quiescent current per amplifier, operating from ±2V to ±6V or 4V–12V supplies. It is used in portable sensor interfaces and data acquisition front-ends where supply headroom and power efficiency are critical.
For engineers reviewing the OPA2705UA datasheet, OPA2705UA pinout, OPA2705UA application, or OPA2705UA equivalent, key selection criteria include its rail-to-rail I/O swing (within 40mV of rails at light load), ultra-low input bias current (1pA), limited-range CMRR (96dB), and SOIC-8 packaging - all verified for operation from –40°C to +85°C.
Technical Context
The OPA2705UA employs a complementary input stage-parallel N-channel and P-channel differential pairs-to achieve rail-to-rail input common-mode range extending 300mV beyond both supply rails. Its class AB output stage enables rail-to-rail output swing down to 40mV from V+ or V− under 100kΩ load.
It is unity-gain stable and specified with 1MHz GBW and 0.6V/µs slew rate across its full supply and temperature range. Input bias current remains below 10pA and offset drift is ±4µV/°C over –40°C to +85°C, supporting precision DC-coupled applications without external trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1MHz - supports stable unity-gain buffering and low-frequency filtering up to ~100kHz with phase margin >60° |
| Slew Rate | 0.6V/µs - limits full-scale step response time to ~15µs for 0.1% settling (5V step) |
| Input Offset Voltage | ±0.5mV (max) - enables <1 LSB error in 12-bit ADC driver applications with 2V full-scale reference |
| Quiescent Current | 160µA per amplifier - allows dual op-amp operation from coin-cell or energy-harvesting sources |
| Input Bias Current | 1pA (typ) - preserves signal integrity in high-impedance pH, photodiode, or piezoelectric sensor interfaces |
| Rail-to-Rail Output Swing | Within 40mV of rails (RL = 100kΩ) - maximizes dynamic range in 3.3V or 5V systems with minimal headroom |
| CMRR (Limited Range) | 96dB - maintains accuracy when common-mode voltage stays within (V−)+0.3V to (V+)−2V |
Pinout & Package
OPA2705UA is housed in an 8-pin SOIC (SO-8) package per JEDEC MS-012, with thermal resistance θJA = 150°C/W. Pin 1 is marked by a beveled corner or dot; device marking reads "OPA2705UA".
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input B (–In B) | High-impedance node for feedback network connection in Channel B; accepts rail-to-rail common-mode inputs |
| 2 | Non-Inverting Input A (+In A) | High-impedance node for signal source connection in Channel A; immune to phase inversion beyond rails if current-limited |
| 3 | Output A (Out A) | Class AB output capable of sourcing/sinking ±10mA; swings to within 40mV of V+ or V− under light load |
| 4 | V− (Negative Supply) | Ground reference for single-supply use or negative rail for dual-supply operation; bypass with 1µF tantalum + 1000pF ceramic |
| 5 | Output B (Out B) | Independent output for second channel; identical drive capability and rail-to-rail swing as Out A |
| 6 | Non-Inverting Input B (+In B) | Signal input for Channel B; matches +In A in impedance and ESD protection structure |
| 7 | Inverting Input A (–In A) | Feedback node for Channel A; same input stage architecture and bias current as –In B |
| 8 | V+ (Positive Supply) | Power input for single- or dual-supply operation; supports 4V–12V or ±2V–±6V; requires local decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization in low-voltage systems (e.g., 3.3V ADC references) without level-shifting circuitry |
| 160µA quiescent current per amplifier | Supports always-on sensor signal conditioning in battery-powered IoT nodes with multi-year runtime |
| 1pA typical input bias current | Prevents significant voltage drop across >10MΩ source impedances, critical for electrochemical and capacitive sensors |
| Unity-gain stable with 1MHz GBW | Permits direct use as buffer or active filter without external compensation components |
| Specified from –40°C to +85°C | Validates performance for automotive cabin electronics, industrial PLC analog I/O, and outdoor metering |
Applications
| Portable Sensor Interface | Automotive Cabin Audio Preamp |
|---|---|
Use Scenario: Amplifying low-level signals from MEMS accelerometers or thermopiles in handheld diagnostic tools powered by Li-ion cells. IC Role / Device Role / Timing Role: Dual-channel signal conditioner: Channel A buffers reference voltage; Channel B amplifies and filters transducer output with rail-to-rail swing. Use Value: 160µA per amplifier extends battery life; rail-to-rail I/O preserves SNR in 3.3V system; 1pA bias avoids sensor loading errors. |
Use Scenario: Low-noise preamplification of microphone signals in vehicle infotainment systems with 5V supply and space-constrained PCB layout. IC Role / Device Role / Timing Role: Dual op-amp providing gain and DC blocking for left/right audio channels before ADC conversion. Use Value: 0.5mV offset ensures minimal DC offset at speaker output; CMRR >96dB rejects ignition noise coupled onto supply rails. |
| Data Acquisition Front-End | Transducer Signal Conditioning |
Use Scenario: Driving SAR ADC inputs in portable multimeters or environmental monitors using ±5V supplies and 16-bit resolution. IC Role / Device Role / Timing Role: Buffer and level-shift stage between precision voltage reference and ADC sample-and-hold input. Use Value: 1MHz GBW settles 5V steps in 15µs (0.1%), meeting 100ksps sampling requirements; 40mV output swing headroom prevents clipping. |
Use Scenario: Amplifying mV-level outputs from strain gauges or RTDs in industrial weight scales or HVAC pressure sensors. IC Role / Device Role / Timing Role: Instrumentation-grade gain stage with matched input pairs and low drift for bridge excitation and differential sensing. Use Value: ±4µV/°C offset drift minimizes calibration drift over ambient temperature changes; rail-to-rail input accommodates wide common-mode shifts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual CMOS op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2316IDR | Lower quiescent current (40µA), lower GBW (10MHz), higher input bias (0.2pA), same SOIC-8 package | Better for ultra-low-power wake-up circuits; less suitable for high-precision DC gain due to higher offset (1.8mV max) | Select OPA2316IDR only when sub-50µA per amplifier is mandatory and bandwidth >1MHz is required |
| MCP6022-I/SN | Higher quiescent current (1mA), higher GBW (10MHz), higher input bias (1pA typ), same SOIC-8, wider temp range (–40°C to +125°C) | Better for high-speed active filters; unsuitable for battery-powered designs due to 6× higher IQ | Choose MCP6022-I/SN when 10MHz bandwidth and extended temperature operation outweigh power budget constraints |
Compared with OPA2705UA, OPA2316IDR trades precision and rail-to-rail input integrity for ultra-low power, while MCP6022-I/SN sacrifices efficiency for speed and extended temperature robustness - making OPA2705UA the optimal balance for portable, precision, rail-to-rail analog signal chains.
Availability
OPA2705UA is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin electronics, and industrial data acquisition requiring stable component supply, RoHS-compliant packaging, and guaranteed −40°C to +85°C operation.
Supply support for OPA2705UA 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-amps and signal chain solutions.
The OPA2705UA belongs to TI's OPA705 family of low-cost, rail-to-rail CMOS op-amps designed specifically for power-sensitive, precision analog signal conditioning in portable, automotive, and industrial equipment.
FAQ
What supply voltage ranges does the OPA2705UA support?
The OPA2705UA operates from single supplies of 4V to 12V or dual supplies of ±2V to ±6V. Its absolute maximum supply rating is 13.2V (V+ to V−), and it is fully specified across the entire ±2V to ±6V range. The device maintains rail-to-rail input and output functionality across this full range, with input common-mode extending 300mV beyond the rails and output swing within 40mV of the rails under light loads. This makes OPA2705UA suitable for both legacy ±5V systems and modern 3.3V or 5V single-supply designs.
Is the OPA2705UA unity-gain stable, and what is its small-signal bandwidth?
Yes, the OPA2705UA is unity-gain stable and has a gain-bandwidth product of 1MHz. At unity gain (G = +1), its −3dB bandwidth is approximately 1MHz, and its slew rate is 0.6V/µs. Typical settling time for a 5V step is 15µs to 0.1% and 20µs to 0.01%. These characteristics are guaranteed over the full −40°C to +85°C temperature range and across the specified supply voltages. The OPA2705UA does not require external compensation for stable operation in buffer or gain-of-two configurations.
What is the input offset voltage specification for the OPA2705UA, and how does it vary with temperature?
The OPA2705UA has a maximum input offset voltage of ±5mV over temperature (−40°C to +85°C), with a typical value of ±0.5mV at +25°C. Its offset voltage drift is ±4µV/°C maximum over temperature. This low drift ensures minimal calibration drift in precision applications such as sensor signal conditioning or reference buffering. The production distribution shows >95% of units fall within ±2.5mV at room temperature, and >90% exhibit drift ≤±3µV/°C - confirming OPA2705UA's suitability for 12-bit to 14-bit measurement accuracy without trimming.
Can the OPA2705UA drive capacitive loads, and what is the recommended approach for stability?
The OPA2705UA can safely drive up to 1000pF of pure capacitive load. For unity-gain configurations with large capacitive loads (>100pF), TI recommends inserting a 10Ω–20Ω series resistor inside the feedback loop (between output and inverting input) to suppress ringing while preserving DC accuracy. This technique is validated in the datasheet's Figure 5. Without this resistor, overshoot increases with capacitance - e.g., ~15% at 100pF and G = +1. The OPA2705UA's internal compensation ensures stability with resistive loads up to 1kΩ and moderate capacitive loads without added components.
What package and marking does the OPA2705UA use, and is it RoHS compliant?
The OPA2705UA is supplied in an 8-pin SOIC (SO-8) package per JEDEC MS-012, with package drawing D and device marking "OPA2705UA". It is RoHS-compliant and green (halogen-free), with NiPdAu lead finish and Moisture Sensitivity Level 2 (260°C peak reflow). The tape-and-reel variant OPA2705UA/2K5 contains 2500 units per reel. All OPA2705UA units are qualified for industrial temperature operation (−40°C to +85°C) and undergo TI's standard production testing per SBOS182A.
OPA2705UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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
OPA2705UA FAQ
1.How can I place an order for OPA2705UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2705UA 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 OPA2705UA reliable?
The price and inventory of OPA2705UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2705UA is usually 5 days.
3.What payment methods are accepted for OPA2705UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2705UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2705UA?
OPA2705UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2705UA 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 OPA2705UA?
For technical support, including OPA2705UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2705UA requirements.
6.How does Aetrix verify that OPA2705UA is sourced from the original manufacturer or authorized distributors?
All OPA2705UA 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 OPA2705UA meets industry standards.
7.What is the process for return or replacement of OPA2705UA?
All OPA2705UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA2705UA, 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 OPA2705UA part is unused and in its original packaging.
Return procedure for OPA2705UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2705UA Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
