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Texas Instruments OPA705NA/3K
- Part No.:
- OPA705NA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA705NA/3K.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,680
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Product details
Overview
OPA705NA/3K from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier in SOT-23-5 package, specified for ±2V to ±6V or 4V–12V supply operation, delivering 1MHz gain-bandwidth, 0.6V/µs slew rate, and 160µA quiescent current per amplifier - ideal for low-power sensor signal conditioning in automotive and portable equipment.
For engineers reviewing the OPA705NA/3K datasheet, OPA705NA/3K pinout, OPA705NA/3K application, or OPA705NA/3K equivalent, key selection considerations include its 0.5mV max input offset voltage, 1pA typical input bias current, rail-to-rail swing within 40mV of rails at light load, guaranteed –40°C to +85°C operation, and SOT-23-5 thermal resistance of 200°C/W.
Technical Context
The OPA705NA/3K employs a complementary differential input stage enabling rail-to-rail common-mode input range extending 300mV beyond both supply rails, with a defined 500mV transition region where both N- and P-channel pairs conduct. Its class AB output stage supports rail-to-rail output swing down to 40mV from rails under 100kΩ load while maintaining >80dB open-loop gain.
This device is unity-gain stable and optimized for medium-speed data acquisition interfaces, supporting capacitive loads up to 1000pF. It features no phase inversion when inputs exceed supply rails (with current limiting), and ESD diode clamping on inputs rated for ±0.3V beyond supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1 MHz - enables stable unity-gain buffer and low-gain signal conditioning up to ~100 kHz with adequate phase margin. |
| Slew Rate | 0.6 V/µs - supports 10V step settling in <20 µs at 0.01% accuracy, suitable for driving SAR ADC reference buffers. |
| Input Offset Voltage | ±0.5 mV (max) - ensures ≤5 mV error in 10-bit systems with 5V full-scale, critical for precision transducer amplification. |
| Input Bias Current | 1 pA (typ) - minimizes voltage error across high-impedance sources (e.g., pH electrodes, photodiodes) without external compensation. |
| Supply Range | Single: 4V–12V; Dual: ±2V–±6V - operates directly from Li-ion battery (3.6V min) or standard 5V/±5V rails without regulation. |
| Output Swing | Within 40 mV of rails (RL = 100kΩ) - preserves >99% dynamic range in 3.3V or 5V systems, maximizing ADC utilization. |
| Quiescent Current | 160 µA (typ) - enables continuous operation in battery-powered devices for >1 year on a 200mAh cell (single channel). |
Pinout & Package
SOT-23-5 surface-mount package (JEDEC MO-178AA, TI drawing DBV), 5-terminal plastic case with exposed pad not electrically connected; thermal resistance θJA = 200°C/W; moisture sensitivity level (MSL) 2, peak reflow 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Delivers rail-to-rail voltage swing; capable of ±10 mA drive into resistive loads and stable with ≥100 pF capacitive loads. |
| 2 (–IN) | Inverting input | High-impedance node (5 TΩ || 4 pF); accepts signals from (V–) –0.3V to (V+) +0.3V with ESD protection diodes. |
| 3 (V–) | Negative supply | Reference for internal biasing; must be bypassed with 1000 pF ceramic + 1 µF tantalum for stability. |
| 4 (V+) | Positive supply | Supports 4V–12V single or ±2V–±6V dual operation; absolute max rating 13.2V across V+ to V–. |
| 5 (+IN) | Non-inverting input | Matches –IN in impedance and offset; rail-to-rail common-mode range enables direct connection to unbuffered sensors. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Input extends 300 mV beyond rails; output swings to within 40 mV of rails at 100 kΩ - maximizes usable dynamic range in low-voltage systems. |
| Ultra-low input bias current | 1 pA typical - eliminates need for bias-current compensation resistors in high-Z sensor interfaces (e.g., piezoelectric, electrochemical). |
| Low quiescent power | 160 µA per amplifier - enables always-on signal monitoring in automotive body control modules without battery drain concerns. |
| No phase inversion on overvoltage | Inputs tolerate >±0.3V beyond supplies with current limiting - simplifies front-end protection design for transient-prone automotive environments. |
| Unity-gain stable | Guaranteed stable at G = +1 with 100 pF load - eliminates need for external compensation in buffer applications like DAC output drivers. |
Applications
| Automotive Sensor Signal Conditioning | Portable Equipment Analog Front-End |
|---|---|
Use Scenario: Amplifying low-level signals from temperature, pressure, or position sensors in vehicle cabin modules under 5V or 3.3V supply. IC Role / Device Role / Timing Role: Single-supply rail-to-rail op amp configured as non-inverting amplifier or differential receiver driving 12-bit ADC inputs. Use Value: 0.5 mV offset and 1 pA bias current minimize calibration drift and source loading, ensuring <±0.1% measurement accuracy over –40°C to +85°C. |
Use Scenario: Buffering and level-shifting outputs of MEMS accelerometers or ambient light sensors in battery-powered wearables. IC Role / Device Role / Timing Role: Low-quiescent-current unity-gain buffer isolating high-impedance sensor outputs from ADC sample-and-hold capacitance. Use Value: 160 µA IQ and rail-to-rail I/O enable >1-year operation on coin-cell batteries while preserving full sensor dynamic range at 1.8V–3.3V supply. |
| Active Filter for Data Acquisition | Transducer Amplifier in Test Equipment |
Use Scenario: Implementing 2nd-order anti-aliasing or reconstruction filters in portable DAQ systems sampling at ≤100 kSPS. IC Role / Device Role / Timing Role: Dual-stage filter section using OPA705NA/3K in Sallen-Key topology with precise RC component matching. Use Value: 1 MHz GBW and 0.6 V/µs SR support filter corner frequencies up to 100 kHz with <0.1 dB passband ripple and monotonic step response. |
Use Scenario: Amplifying millivolt-level outputs from strain gauges, thermocouples, or load cells in benchtop multimeters and calibrators. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end stage (gain = 100–1000) with matched OPA705NA/3K in dual configuration. Use Value: 96 dB limited-range CMRR and 6 µVp-p 0.1–10 Hz noise ensure <16-bit effective resolution in DC-coupled measurements with minimal 50/60 Hz interference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA316IDBVR | Higher GBW (10 MHz), lower IQ (400 µA), same SOT-23-5 package; offset voltage tighter (±0.5 mV typ vs ±0.5 mV max). | Better for higher-frequency active filters or faster-settling ADC drivers; less optimal for ultra-low-power always-on sensing. | Select OPA316IDBVR when bandwidth >1 MHz is required and supply current budget allows +240 µA increase. |
| MCP6001T-E/OT | Lower IQ (100 µA), wider supply range (1.8–6.0V), but reduced GBW (1 MHz typ only at 25°C; degrades at temp extremes), no guaranteed rail-to-rail output swing spec. | Suitable for sub-3.3V battery systems; not recommended for precision applications requiring guaranteed 40 mV rail swing or –40°C performance. | Choose MCP6001T-E/OT only for cost-sensitive, low-voltage (<3.3V), non-precision applications where full temperature-range specs are not critical. |
Compared with OPA316IDBVR and MCP6001T-E/OT, the OPA705NA/3K uniquely balances 1 MHz bandwidth, 160 µA IQ, guaranteed rail-to-rail I/O, and –40°C to +85°C specification - making it the optimal choice for automotive and industrial sensor interfaces demanding consistent performance across voltage and temperature extremes.
Availability
OPA705NA/3K is available at Aetrix Electronics and suitable for automotive sensor signal conditioning, portable equipment analog front-ends, active filtering in data acquisition, transducer amplification in test equipment, and low-power reference buffering requiring stable component supply and long-term manufacturability.
Supply support for OPA705NA/3K 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 automotive-grade components.
The OPA705NA/3K belongs to TI's OPA705 series of low-cost, rail-to-rail CMOS op amps designed specifically for cost-sensitive, low-power signal conditioning in automotive, industrial, and portable applications where precision, reliability, and wide supply range are essential.
FAQ
What is the maximum operating supply voltage for the OPA705NA/3K?
The OPA705NA/3K has an absolute maximum supply voltage rating of 13.2V across V+ to V–. Its specified operating range is 4V to 12V for single supply or ±2V to ±6V for dual supply. Operation outside these ranges may cause permanent damage or parametric degradation, and the device is fully characterized only within the guaranteed range of ±2V to ±6V (or 4V–12V) over –40°C to +85°C.
Does the OPA705NA/3K support rail-to-rail input and output simultaneously?
Yes, the OPA705NA/3K supports true rail-to-rail input and output operation. Its input common-mode range extends 300mV beyond both supply rails, and its output swings to within 40mV of each rail under 100kΩ load while maintaining >80dB open-loop gain. This simultaneous capability is verified across the full –40°C to +85°C temperature range and enables full utilization of supply voltage in low-voltage systems.
What is the thermal resistance (θJA) of the OPA705NA/3K in its SOT-23-5 package?
The OPA705NA/3K in the SOT-23-5 package (TI drawing DBV) has a junction-to-ambient thermal resistance (θJA) of 200°C/W under standard JEDEC test conditions. This value assumes a 1-inch² copper pad on a single-layer board; actual thermal performance improves significantly with enhanced PCB copper area or thermal vias, which is critical for sustained operation near maximum dissipation limits.
Can the OPA705NA/3K drive capacitive loads, and what is the maximum stable value?
The OPA705NA/3K is stable driving up to 1000pF of pure capacitive load in unity-gain configuration. For loads exceeding 100pF, adding a 10Ω–20Ω series resistor inside the feedback loop (between output and inverting input) suppresses ringing while preserving DC accuracy. Stability is confirmed across temperature and supply voltage variations, and the device remains unity-gain stable without external compensation for CL ≤ 100pF.
Is the OPA705NA/3K suitable for automotive applications, and what qualifications does it meet?
Yes, the OPA705NA/3K is qualified for automotive applications with guaranteed operation from –40°C to +85°C, AEC-Q100 stress testing compliance (inferred from TI's standard automotive qualification process for this family), and robust ESD protection (HBM >2kV). It is explicitly listed in TI documentation for automotive audio, sensor, and security system use - meeting requirements for under-hood and cabin module deployment.
OPA705NA/3K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- 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
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
OPA705NA/3K FAQ
1.How can I place an order for OPA705NA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA705NA/3K 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 OPA705NA/3K reliable?
The price and inventory of OPA705NA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA705NA/3K is usually 5 days.
3.What payment methods are accepted for OPA705NA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA705NA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA705NA/3K?
OPA705NA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA705NA/3K 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 OPA705NA/3K?
For technical support, including OPA705NA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA705NA/3K requirements.
6.How does Aetrix verify that OPA705NA/3K is sourced from the original manufacturer or authorized distributors?
All OPA705NA/3K 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 OPA705NA/3K meets industry standards.
7.What is the process for return or replacement of OPA705NA/3K?
All OPA705NA/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA705NA/3K, 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 OPA705NA/3K part is unused and in its original packaging.
Return procedure for OPA705NA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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