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Texas Instruments OPA2705EA/250G4
- Part No.:
- OPA2705EA/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA2705EA/250G4.pdf
- Description:
- IC CMOS 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,009
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Product details
Overview
OPA2705EA/250G4 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 1 MHz gain-bandwidth, 0.6 V/µs slew rate, 0.5 mV max input offset voltage, 160 µA quiescent current per amplifier, and operates from ±2 V to ±6 V (or 4 V to 12 V single supply). It is used in automotive sensor interfaces and portable data acquisition front-ends.
For engineers reviewing the OPA2705EA/250G4 datasheet, OPA2705EA/250G4 pinout, OPA2705EA/250G4 application, or OPA2705EA/250G4 equivalent, key selection considerations include rail-to-rail I/O swing at low supply, input bias current of 1 pA, CMRR of 96 dB (limited range), output swing within 40 mV of rails (100 kΩ load), and MSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The OPA2705EA/250G4 employs a complementary differential input stage enabling rail-to-rail common-mode input range extending 300 mV beyond both supply rails. Its class AB output stage supports rail-to-rail output swing down to 40 mV from V+ or V− under light loads.
It is unity-gain stable and specified over –40°C to +85°C. Input voltage noise is 45 nV/√Hz at 1 kHz, and total harmonic distortion + noise is 0.02% at 1 kHz with 3 Vp-p output - confirming suitability for medium-speed precision buffering and transducer amplification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1 MHz - supports stable closed-loop operation up to 100 kHz at G = 10 without phase margin degradation. |
| Slew Rate | 0.6 V/µs - enables accurate reproduction of ≤100 kHz full-scale sine waves with <0.1% distortion. |
| Input Offset Voltage | ±0.5 mV (max) - ensures ≤5 mV error in 10 V full-scale measurement systems without trimming. |
| Quiescent Current | 160 µA per amplifier - allows dual-channel operation from coin-cell or energy-harvesting supplies. |
| Input Bias Current | 1 pA (typ) - minimizes voltage error across high-impedance sources (e.g., pH electrodes, piezoelectric sensors). |
| CMRR (Limited Range) | 96 dB - maintains accuracy when common-mode voltage stays within (V−) to (V+) − 2 V, critical for unipolar sensor bridges. |
| Output Swing (100 kΩ) | Within 40 mV of V+ and V− - preserves >99% dynamic range in 3.3 V or 5 V systems. |
Pinout & Package
VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm, 0.65 mm pitch, exposed thermal pad, RoHS-compliant, moisture sensitivity level 2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +In A | Non-inverting input of Amplifier A - high-impedance node (5 TΩ || 4 pF) for sensor or reference connection. |
| 2 | –In A | Inverting input of Amplifier A - accepts feedback network or signal source with minimal loading. |
| 3 | Out A | Amplifier A output - drives loads ≥100 kΩ to within 40 mV of rails; capable of ±10 mA sourcing/sinking. |
| 4 | V− | Negative supply terminal - must be bypassed with 1 µF tantalum + 1000 pF ceramic for stability. |
| 5 | V+ | Positive supply terminal - accepts 4 V to 12 V single or ±2 V to ±6 V dual supply; PSRR = 100 µV/V. |
| 6 | +In B | Non-inverting input of Amplifier B - electrically isolated from Amp A; shares same input stage architecture. |
| 7 | –In B | Inverting input of Amplifier B - independent channel; no crosstalk above –98 dB at DC. |
| 8 | Out B | Amplifier B output - identical performance to Out A; channel separation ≥120 dB at 1 kHz. |
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 signal range in low-voltage systems. |
| Ultra-low input bias current | 1 pA typical - avoids significant voltage drop across MΩ-range source impedances (e.g., thermistors, photodiodes). |
| Low quiescent power | 160 µA per amplifier - enables dual-channel operation below 1 mW at 5 V, suitable for battery-powered instrumentation. |
| Unity-gain stability | Guaranteed stable at G = 1 with capacitive loads ≤1000 pF - eliminates need for external compensation in buffer applications. |
| Specified over industrial temperature | Full electrical performance guaranteed from –40°C to +85°C - supports automotive cabin and industrial control environments. |
Applications
| Automotive Sensor Interface | Portable Data Acquisition |
|---|---|
Use Scenario: Amplifying low-level signals from resistive temperature detectors (RTDs) or pressure sensors in vehicle climate control modules. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with rail-to-rail I/O enabling direct interface to 3.3 V ADCs. Use Value: 0.5 mV offset and 96 dB CMRR suppress common-mode noise from engine EMI while preserving microvolt-level resolution. |
Use Scenario: Signal conditioning for handheld multimeters or portable oscilloscope front-ends powered by AA batteries. IC Role / Device Role / Timing Role: Dual-channel buffer and gain stage driving SAR ADC inputs with minimal power overhead. Use Value: 160 µA per amplifier allows continuous dual-channel operation for >100 hours on two AA cells, with 1 MHz bandwidth supporting 100 kSps sampling. |
| Transducer Amplifier | Active Filter Stage |
Use Scenario: Conditioning outputs from piezoelectric accelerometers in structural health monitoring nodes. IC Role / Device Role / Timing Role: High-input-impedance charge amplifier with ultra-low bias current preventing signal decay in high-Z sources. Use Value: 1 pA input bias current prevents measurable drift over 10 s integration windows, critical for low-frequency vibration analysis. |
Use Scenario: Second-order Sallen-Key low-pass filter in audio line drivers or anti-aliasing stages for data loggers. IC Role / Device Role / Timing Role: Unity-gain stable op amp implementing filter transfer function with minimal phase shift near cutoff. Use Value: 1 MHz GBW supports filter cutoff frequencies up to 100 kHz with <0.1 dB passband ripple and monotonic roll-off. |
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 (50 µA), lower GBW (10 MHz), higher input bias (0.2 pA), same VSSOP-8 package. | Better for ultra-low-power always-on sensing; less suitable for 1 V/µs transient response requirements. | Select OPA2316IDR only if sub-100 µA per amplifier is mandatory and 10 MHz bandwidth is needed. |
| MCP6022-I/SN | Higher quiescent current (1 mA), higher GBW (10 MHz), higher input bias (100 pA), SOIC-8 package only. | Preferred for high-speed active filters but increases system power by 6× and reduces battery life significantly. | Choose MCP6022-I/SN only when 10 MHz bandwidth is required and board space allows SOIC-8 instead of VSSOP-8. |
Compared with OPA2705EA/250G4, OPA2316IDR trades bandwidth and drive strength for ultra-low power, while MCP6022-I/SN sacrifices efficiency for speed - making OPA2705EA/250G4 the optimal balance for precision, low-power dual-channel signal conditioning in compact designs.
Availability
OPA2705EA/250G4 is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable data acquisition systems, and transducer amplifier circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA2705EA/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, specializing in analog and embedded processing technologies with over 50 years of innovation in precision amplifiers and signal chain solutions.
The OPA705 family - including OPA2705EA/250G4 - was designed specifically for cost-sensitive, low-power applications demanding rail-to-rail I/O performance in automotive, industrial, and portable instrumentation systems.
FAQ
What is the operating temperature range for the OPA2705EA/250G4?
The OPA2705EA/250G4 is fully specified and guaranteed over an operating temperature range of –40°C to +85°C. This industrial-grade rating makes it suitable for under-hood automotive applications and industrial control environments where ambient temperatures fluctuate widely. The device remains functional from –55°C to +125°C, though electrical parameters outside the –40°C to +85°C range are not production-tested or guaranteed.
Does the OPA2705EA/250G4 support single-supply operation?
Yes, the OPA2705EA/250G4 supports true single-supply operation from 4 V to 12 V. Its rail-to-rail input and output stages allow full-swing signal handling even at 3.3 V or 5 V supplies. For example, with V+ = 5 V and V− = 0 V, the input common-mode range extends from –0.3 V to +5.3 V, and the output can swing from 40 mV to 4.96 V into a 100 kΩ load - enabling direct interfacing with 3.3 V or 5 V ADCs without level-shifting circuitry.
What is the maximum capacitive load the OPA2705EA/250G4 can drive reliably?
The OPA2705EA/250G4 can drive up to 1000 pF of pure capacitive load while maintaining stability in unity-gain configuration. At higher gains (G ≥ +5), its ability to drive capacitive loads improves further due to increased phase margin. For loads exceeding 100 pF in G = +1, TI recommends adding a 10 Ω to 20 Ω series resistor inside the feedback loop to suppress ringing - a technique validated in the official SBOS182A datasheet Figure 5.
Is the OPA2705EA/250G4 pin-compatible with other dual op amps in VSSOP-8?
No - the OPA2705EA/250G4 has a non-standard pinout for VSSOP-8: pins 1–3 and 6–8 are active (±In/Out for both amplifiers), pin 4 is V−, and pin 5 is V+. This differs from industry-standard dual op amp pinouts (e.g., TLV2372, MCP6022), which place V+ at pin 8 and V− at pin 4. PCB layout must follow the DGK drawing; substitution requires board redesign unless using TI's OPA2705UA (SOIC-8) variant with standard pinout.
What packaging and environmental compliance does the OPA2705EA/250G4 meet?
The OPA2705EA/250G4 is supplied in a Green (RoHS & no Sb/Br), lead-free VSSOP-8 (DGK) package with NIPDAUAG finish, moisture sensitivity level 2 (260°C peak reflow), and JEDEC-compliant tape-and-reel packaging (250 units per reel). It meets TI's standard warranty and is rated for industrial temperature operation (–40°C to +85°C), with full traceability and RoHS/REACH compliance documentation available upon request.
OPA2705EA/250G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
OPA2705EA/250G4 FAQ
1.How can I place an order for OPA2705EA/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2705EA/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 OPA2705EA/250G4 reliable?
The price and inventory of OPA2705EA/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2705EA/250G4 is usually 5 days.
3.What payment methods are accepted for OPA2705EA/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2705EA/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2705EA/250G4?
OPA2705EA/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2705EA/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 OPA2705EA/250G4?
For technical support, including OPA2705EA/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2705EA/250G4 requirements.
6.How does Aetrix verify that OPA2705EA/250G4 is sourced from the original manufacturer or authorized distributors?
All OPA2705EA/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 OPA2705EA/250G4 meets industry standards.
7.What is the process for return or replacement of OPA2705EA/250G4?
All OPA2705EA/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2705EA/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 OPA2705EA/250G4 part is unused and in its original packaging.
Return procedure for OPA2705EA/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2705EA/250G4 Tags
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