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Texas Instruments OPA705NA/250G4
- Part No.:
- OPA705NA/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA705NA/250G4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,927
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Product details
Overview
OPA705NA/250G4 from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, medium-speed signal conditioning in 4V–12V single-supply or ±2V–±6V dual-supply systems. It delivers 1MHz gain-bandwidth, 0.6V/µs slew rate, 0.5mV max input offset, 160µA quiescent current per amplifier, and output swing within 40mV of rails under light load - enabling high dynamic range in battery-powered sensor interfaces and portable data acquisition.
For engineers reviewing the OPA705NA/250G4 datasheet, OPA705NA/250G4 pinout, OPA705NA/250G4 application, or OPA705NA/250G4 equivalent, key selection considerations include its SOT23-5 package footprint, rail-to-rail I/O capability at sub-200µA IQ, limited-range CMRR (96dB), and guaranteed operation from –40°C to +85°C in automotive and industrial environments.
Technical Context
The OPA705NA/250G4 employs a complementary differential input stage enabling rail-to-rail common-mode input range extending 300mV beyond supply rails, with a defined 500mV transition region where both N- and P-channel pairs are active - impacting PSRR and CMRR locally. Its class AB output stage supports rail-to-rail swing down to 40mV at 100kΩ load while maintaining >80dB open-loop gain.
It is unity-gain stable and specified across full supply (4V–12V) and temperature (–40°C to +85°C) ranges. Input bias current remains ultra-low (1pA typ) and independent of common-mode voltage outside the transition zone, supporting high-impedance transducer interfacing without significant error drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1MHz - enables stable amplification up to ~100kHz at G=10 without phase margin loss |
| Slew Rate | 0.6V/µs - supports ≤600kHz full-power bandwidth for 1Vpp signals |
| Input Offset Voltage | ±0.5mV max - contributes ≤0.05% error in 1V full-scale 12-bit ADC front-end |
| Quiescent Current | 160µA per amplifier - allows 10+ op amps on a 2mA budget in portable systems |
| Rail-to-Rail Output Swing | Within 40mV of V+ or V− at 100kΩ - preserves >96% of 3.3V supply headroom |
| Input Bias Current | 1pA typ - introduces <1mV error across 1GΩ source impedance at 25°C |
| CMRR (Limited Range) | 96dB - maintains ≥0.002% rejection of supply noise in mid-rail common-mode conditions |
Pinout & Package
SOT23-5 surface-mount package (JEDEC MO-178, TI drawing DBV), 2.9mm × 1.6mm footprint, 1.0mm max height, thermal resistance θJA = 200°C/W. RoHS-compliant, green finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Capable of sourcing/sinking ±10mA; swings rail-to-rail with <40mV overhead at high-Z loads |
| 2 (–IN) | Inverting input | High-impedance node (5TΩ || 4pF); accepts voltages 300mV beyond rails when current-limited to 10mA |
| 3 (V–) | Negative supply | Supports ground-referenced single supply or negative rail in dual supply; must be bypassed with 1µF + 1000pF |
| 4 (V+) | Positive supply | Accepts 4V–12V single or ±2V–±6V dual; supplies internal bias and output stage |
| 5 (+IN) | Non-inverting input | Matches –IN in impedance and ESD protection; enables precision buffer or non-inverting gain configurations |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of 3.3V or 5V supply rails in low-voltage systems without level-shifting circuitry |
| Ultra-low input bias current (1pA) | Permits direct connection to high-impedance pH electrodes, piezoelectric sensors, and photodiode TIA feedback networks |
| 160µA quiescent current | Allows integration into always-on sensor nodes with multi-year battery life using coin cells or energy harvesting |
| Unity-gain stability | Eliminates need for external compensation in buffer, active filter, and reference buffering applications |
| Specified over –40°C to +85°C | Validated for under-hood automotive, industrial control, and outdoor instrumentation deployments |
Applications
| Automotive Sensor Interface | Portable Data Acquisition |
|---|---|
Use Scenario: Amplifying millivolt-level outputs from exhaust gas oxygen (EGO) or manifold absolute pressure (MAP) sensors in engine control units. IC Role / Device Role / Timing Role: Precision DC-coupled transducer amplifier with rail-to-rail input to capture full sensor range near supply rails. Use Value: 0.5mV offset and 1pA bias current minimize zero-point drift and loading error, improving A/D conversion accuracy in 12-bit systems. | Use Scenario: Front-end signal conditioning for handheld multimeters or portable oscilloscope probes operating from single 3.7V Li-ion cells. IC Role / Device Role / Timing Role: Low-power, rail-to-rail buffer isolating high-impedance probe tips from ADC input stages. Use Value: 160µA IQ extends battery runtime; 1MHz GBW supports accurate 100kHz waveform capture without distortion. |
| Active Filter for Audio Preamp | Transducer Amplifier in Medical Wearables |
Use Scenario: 2nd-order Sallen-Key low-pass filtering of microphone signals prior to audio codec input in voice-enabled IoT devices. IC Role / Device Role / Timing Role: Unity-gain stable, low-noise op amp implementing filter transfer function with minimal component count. Use Value: 45nV/√Hz input voltage noise and 0.6V/µs slew rate preserve SNR and transient fidelity across 20Hz–20kHz band. | Use Scenario: Amplifying microvolt-level bio-potential signals (ECG, EMG) in compact wearable patches powered by thin-film batteries. IC Role / Device Role / Timing Role: High-input-impedance, low-drift amplifier in first-stage instrumentation configuration. Use Value: Rail-to-rail I/O maximizes dynamic range from 1.8V supply; 96dB CMRR rejects common-mode interference from digital subsystems. |
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 (10MHz), higher IQ (400µA), same SOT23-5 package, lower offset (0.3mV) | Better for higher-frequency active filters or faster settling requirements; less suitable for ultra-low-power designs | Select when bandwidth >1MHz or offset <0.5mV is critical; verify layout compatibility with higher-speed layout rules |
| MCP6001UT-E/OT | Lower IQ (100µA), lower GBW (1MHz), same rail-to-rail I/O, wider temp range (–40°C to +125°C), different pinout (OUT/–IN/V+/+IN/V–) | Preferred for extended-temperature industrial sensors; not pin-compatible with OPA705NA/250G4 | Choose for cost-sensitive, wide-temp applications where pinout redesign is acceptable and 100µA IQ suffices |
Compared with OPA316IDBVR and MCP6001UT-E/OT, the OPA705NA/250G4 uniquely balances 1MHz bandwidth, 160µA IQ, and 0.5mV offset in a proven SOT23-5 footprint - making it optimal for automotive sensor signal chains where moderate speed, low power, and production-proven reliability are jointly required.
Availability
OPA705NA/250G4 is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable data acquisition systems, and medical wearable transducer amplifiers requiring stable component supply across extended temperature and long product lifecycles.
Supply support for OPA705NA/250G4 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPA705NA/250G4 belongs to TI's precision op amp portfolio designed specifically for cost-sensitive, low-power signal conditioning in rail-to-rail constrained environments - emphasizing manufacturability, temperature robustness, and ease of use in space-constrained PCB layouts.
FAQ
What is the maximum capacitive load the OPA705NA/250G4 can drive stably?
The OPA705NA/250G4 can drive up to 1000pF of pure capacitive load while maintaining stability. At unity gain, adding a 10Ω–20Ω series resistor inside the feedback loop improves ringing behavior with large capacitive loads without affecting DC accuracy. This capability supports direct driving of ADC input capacitors and long PCB traces in data acquisition systems.
Does the OPA705NA/250G4 exhibit phase inversion when inputs exceed the supply rails?
No, the OPA705NA/250G4 does not exhibit phase inversion when inputs extend beyond the supply rails, provided input current is limited to ≤10mA using an external series resistor. This behavior is confirmed in Figure 4 of the SBOS182A datasheet and enables safe overvoltage-tolerant interfacing with unconditioned sensor outputs or fault-prone signal paths.
What is the output voltage swing specification for the OPA705NA/250G4 at 20kΩ load?
At 20kΩ load and open-loop gain >100dB, the OPA705NA/250G4 output swings to within 75mV of each supply rail. This is documented in the Electrical Characteristics table under "Voltage Output Swing from Rail" and ensures >92% of full-scale range remains usable in typical buffered reference or active filter applications.
Is the OPA705NA/250G4 qualified for automotive applications?
Yes, the OPA705NA/250G4 is specified and tested for operation from –40°C to +85°C, and its datasheet explicitly lists "Automotive Applications: Audio, Sensor Applications, Security Systems" in the Applications section. While not AEC-Q200 certified out-of-box, its performance envelope and qualification testing align with Tier-2 automotive subsystem requirements.
What package variant and marking correspond to OPA705NA/250G4?
The OPA705NA/250G4 uses the SOT23-5 package (TI drawing DBV), with device marking "A05" laser-etched on the top surface. The "/250G4" suffix denotes tape-and-reel packaging of 250 units per reel, green RoHS-compliant finish, and JEDEC MSL Level-2 moisture sensitivity rating.
OPA705NA/250G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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/250G4 FAQ
1.How can I place an order for OPA705NA/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA705NA/250G4 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/250G4 reliable?
The price and inventory of OPA705NA/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA705NA/250G4 is usually 5 days.
3.What payment methods are accepted for OPA705NA/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA705NA/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA705NA/250G4?
OPA705NA/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA705NA/250G4 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/250G4?
For technical support, including OPA705NA/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA705NA/250G4 requirements.
6.How does Aetrix verify that OPA705NA/250G4 is sourced from the original manufacturer or authorized distributors?
All OPA705NA/250G4 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/250G4 meets industry standards.
7.What is the process for return or replacement of OPA705NA/250G4?
All OPA705NA/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA705NA/250G4, 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/250G4 part is unused and in its original packaging.
Return procedure for OPA705NA/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA705NA/250G4 Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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