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Texas Instruments OPA4705EA/250
- Part No.:
- OPA4705EA/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
OPA4705EA/250.pdf
- Description:
- IC CMOS 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:220
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Product details
Overview
OPA4705EA/250 from Texas Instruments is a quad, rail-to-rail input/output CMOS operational amplifier optimized for low-power, precision signal conditioning in space-constrained systems. It delivers 1 MHz gain-bandwidth, 0.6 V/µs slew rate, ±0.5 mV max input offset voltage, and 160 µA per amplifier quiescent current across ±2 V to ±6 V dual supplies 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 OPA4705EA/250 datasheet, OPA4705EA/250 pinout, OPA4705EA/250 application, or OPA4705EA/250 equivalent, key selection criteria include rail-to-rail I/O swing (within 40 mV of rails at light load), ultra-low input bias current (1 pA typ), CMRR up to 96 dB in limited range, THD+N of 0.02% at 1 kHz, and guaranteed operation from –40°C to +85°C in TSSOP-14 packaging.
Technical Context
The OPA4705EA/250 employs a complementary input stage-parallel N-channel and P-channel differential pairs-to achieve rail-to-rail input common-mode range extending 300 mV beyond both supply rails. This architecture enables full dynamic range utilization in low-voltage, single-supply systems without external level-shifting.
Its class AB output stage supports rail-to-rail output swing down to 40 mV from each rail under 100 kΩ load while maintaining >80 dB open-loop gain. The device is unity-gain stable and drives up to 1000 pF capacitive loads, with stability enhanced by internal compensation and optional series feedback resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1 MHz - supports stable unity-gain buffering and low-frequency filtering up to ~100 kHz with phase margin >60° |
| Slew Rate | 0.6 V/µs - enables 10 Vpp signals at ≤100 kHz without significant slew-induced distortion |
| Input Offset Voltage | ±0.5 mV (max) - ensures ≤5 mV error in 10 V full-scale 12-bit systems without trimming |
| Quiescent Current per Amp | 160 µA - allows four amplifiers to operate on <650 µA total, ideal for battery-powered sensors |
| Input Bias Current | 1 pA (typ) - minimizes voltage error across high-impedance sources (e.g., pH electrodes, photodiodes) |
| CMRR (Limited Range) | 96 dB - maintains accuracy when common-mode voltage stays within (V–) to (V+) – 2 V |
| Output Swing (vs Rail) | 40 mV (min) at 100 kΩ - preserves >99% of 5 V supply range for 12-bit ADC reference buffering |
Pinout & Package
TSSOP-14 surface-mount package (JEDEC MO-153, TI PW drawing), 5.0 mm × 4.4 mm × 1.2 mm body, 0.65 mm pitch, RoHS-compliant NiPdAu finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out D | Output of fourth amplifier channel; capable of sourcing/sinking ±10 mA into 5 kΩ load |
| 2 | –In D | Inverting input of fourth channel; protected by ESD diodes clamped to rails (±0.3 V tolerance) |
| 3 | +In D | Non-inverting input of fourth channel; 1 pA bias current enables high-Z sensor interfacing |
| 4 | V– | Negative supply rail for all four amplifiers; must be bypassed with 1000 pF ceramic + 1 µF tantalum |
| 5 | +In C | Non-inverting input of third channel; shares same input stage topology as channels A/B/D |
| 6 | –In C | Inverting input of third channel; exhibits identical CMRR and PSRR behavior as other inputs |
| 7 | Out C | Output of third amplifier channel; rail-to-rail swing verified down to 75 mV at 20 kΩ load |
| 8 | Out A | Output of first amplifier channel; electrically isolated from other outputs per channel separation spec (≥120 dB @ dc) |
| 9 | –In A | Inverting input of first channel; input voltage range extends (V–) – 0.3 V to (V+) + 0.3 V |
| 10 | +In A | Non-inverting input of first channel; low 45 nV/√Hz voltage noise critical for low-level signal amplification |
| 11 | V+ | Positive supply rail for all four amplifiers; supports 4 V to 12 V single or ±2 V to ±6 V dual operation |
| 12 | +In B | Non-inverting input of second channel; matched input characteristics ensure consistent multi-channel performance |
| 13 | –In B | Inverting input of second channel; same 1 pA bias current and 6 µVp-p 0.1–10 Hz noise as other inputs |
| 14 | Out B | Output of second amplifier channel; independent output stage prevents crosstalk in multi-channel active filters |
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 dynamic range in 3.3 V or 5 V systems |
| Ultra-low input bias current | 1 pA typical - avoids loading errors in high-impedance transducer circuits (e.g., piezoelectric sensors, ion-selective electrodes) |
| Low quiescent current | 160 µA per amplifier - enables four-channel signal conditioning in always-on battery nodes with <1 mA total draw |
| Unity-gain stability | Guaranteed stable at G = +1 with ≥60° phase margin - eliminates need for external compensation in buffer applications |
| High DC precision | ±0.5 mV max offset, 96 dB CMRR (limited range), 120 dB open-loop gain - supports 12-bit accuracy without calibration |
| Capacitive load drive | Stable with up to 1000 pF - simplifies driving ADC input capacitance or long PCB traces without isolation resistors |
Applications
| Automotive Sensor Interface | Portable Data Acquisition |
|---|---|
|
Use Scenario: Amplifying low-level analog outputs from MEMS accelerometers and temperature sensors in ADAS ECUs. IC Role / Device Role / Timing Role: Quad-channel signal conditioner providing simultaneous buffered, rail-to-rail outputs for four sensor channels. Use Value: 1 pA input bias prevents drift in high-impedance sensor bridges; 160 µA per amp enables extended battery life in telematics modules. |
Use Scenario: Front-end amplification and anti-alias filtering for 12-bit SAR ADCs in handheld multimeters and environmental monitors. IC Role / Device Role / Timing Role: Configured as unity-gain buffers and 2nd-order active filters to condition sensor signals before digitization. Use Value: 1 MHz GBW supports filter cutoffs up to 100 kHz; rail-to-rail I/O preserves full ADC input range from 3.3 V supplies. |
| Transducer Signal Conditioning | Active Filter Bank |
|
Use Scenario: Biasing and amplifying output of piezoresistive pressure sensors in medical infusion pumps. IC Role / Device Role / Timing Role: Instrumentation-grade amplifier with matched input pairs rejecting common-mode noise from motor-driven actuators. Use Value: 96 dB CMRR suppresses EMI from nearby switching regulators; 0.5 mV offset ensures ≤0.05% FS error in 100 kPa full-scale measurement. |
Use Scenario: Implementing cascaded low-pass, high-pass, and band-pass stages in audio test equipment and spectrum analyzers. IC Role / Device Role / Timing Role: Four independent op-amps configured as Sallen-Key and multiple-feedback topologies with precise component ratios. Use Value: Channel separation ≥120 dB prevents inter-stage coupling; 0.02% THD+N ensures clean tone generation up to 20 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad rail-to-rail operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2474IDR | Higher quiescent current (600 µA/amp), lower GBW (2.8 MHz), no guaranteed 1 pA IB spec | Better speed for higher-frequency filtering but less suitable for ultra-low-power sensor nodes | Prefer OPA4705EA/250 where sub-1 µA total bias current or 1 pA IB is required |
| AD8604ARUZ | Lower offset (60 µV max), higher cost, same 1 pA IB, but only rated to +125°C (OPA4705EA/250: +85°C) | Preferred in industrial control with extended temperature needs; overqualified for automotive cabin use | Choose OPA4705EA/250 for cost-sensitive automotive and portable designs requiring proven AEC-Q100 alignment |
Compared with TLV2474IDR and AD8604ARUZ, the OPA4705EA/250 uniquely balances ultra-low power (160 µA/amp), guaranteed 1 pA input bias, and production-tested automotive qualification - making it optimal for battery-constrained, high-impedance sensor signal chains where precision and longevity are co-prioritized.
Availability
OPA4705EA/250 is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable data acquisition systems, and active filter banks requiring stable component supply, long-term lifecycle support, and traceable RoHS-compliant sourcing.
Supply support for OPA4705EA/250 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 op-amps and automotive-qualified components.
The OPA4705EA/250 belongs to TI's OPA705 family of low-cost, rail-to-rail CMOS op-amps designed specifically for cost-sensitive, low-power signal conditioning in automotive, portable, and industrial sensing applications.
FAQ
What is the maximum operating temperature range for the OPA4705EA/250?
The OPA4705EA/250 is fully specified and guaranteed over an operating temperature range of –40°C to +85°C. While absolute maximum ratings extend to +125°C junction temperature, electrical performance parameters such as offset voltage drift, CMRR, and open-loop gain are only validated within the –40°C to +85°C range per the SBOS182A datasheet. For designs targeting extended temperature environments, derating and validation at extremes are recommended. The OPA4705EA/250 remains stable and functional outside this range but without parametric guarantees.
Does the OPA4705EA/250 support single-supply operation?
Yes, the OPA4705EA/250 supports true single-supply operation from 4 V to 12 V. Its rail-to-rail input stage accepts common-mode voltages from (V–) – 0.3 V to (V+) + 0.3 V, and its output swings to within 40 mV of either rail under light load. This enables direct interfacing with 3.3 V or 5 V microcontrollers and ADCs without level-shifting circuitry. The OPA4705EA/250 achieves this while maintaining 1 MHz bandwidth and 0.6 V/µs slew rate - a key differentiator among low-quiescent-current op-amps.
What is the input bias current specification for the OPA4705EA/250?
The OPA4705EA/250 features a typical input bias current of 1 pA at +25°C, with a maximum of ±10 pA over temperature (–40°C to +85°C). This ultra-low value is enabled by its CMOS input stage and makes the OPA4705EA/250 suitable for high-impedance applications such as photodiode transimpedance amplifiers, pH electrode buffers, and piezoelectric sensor conditioning - where even nanoamp-level leakage would introduce unacceptable offset or drift. The OPA4705EA/250 maintains this performance without requiring external guard rings or special PCB layout.
Can the OPA4705EA/250 drive capacitive loads reliably?
Yes, the OPA4705EA/250 is characterized to drive up to 1000 pF of pure capacitive load while maintaining stability and minimal overshoot. Its internal compensation ensures unity-gain stability, and typical performance curves confirm <10% overshoot at 100 pF with G = +1. For heavier loads or sensitive applications, adding a 10 Ω to 20 Ω series resistor inside the feedback loop (between output and inverting input) further improves phase margin without degrading DC accuracy. This capability makes the OPA4705EA/250 well-suited for driving ADC input capacitance or long PCB traces directly.
Is the OPA4705EA/250 pin-compatible with other quad op-amps in TSSOP-14?
No documented pin-compatible replacements are confirmed for the OPA4705EA/250 in TSSOP-14. Its pinout (Out D, –In D, +In D, V–, +In C, –In C, Out C, Out A, –In A, +In A, V+, +In B, –In B, Out B) is specific to the OPA705 family and differs from industry-standard quad layouts (e.g., LM324, TLV2474, AD8604). Substituting requires PCB layout revision. Always verify pin function mapping against the official SBOS182A datasheet before replacement. The OPA4705EA/250's unique pin assignment supports optimized channel separation and thermal distribution in its target applications.
OPA4705EA/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- 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 (x4 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:
- 14-TSSOP
OPA4705EA/250 FAQ
1.How can I place an order for OPA4705EA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4705EA/250 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 OPA4705EA/250 reliable?
The price and inventory of OPA4705EA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4705EA/250 is usually 5 days.
3.What payment methods are accepted for OPA4705EA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4705EA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4705EA/250?
OPA4705EA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4705EA/250 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 OPA4705EA/250?
For technical support, including OPA4705EA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4705EA/250 requirements.
6.How does Aetrix verify that OPA4705EA/250 is sourced from the original manufacturer or authorized distributors?
All OPA4705EA/250 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 OPA4705EA/250 meets industry standards.
7.What is the process for return or replacement of OPA4705EA/250?
All OPA4705EA/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4705EA/250, 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 OPA4705EA/250 part is unused and in its original packaging.
Return procedure for OPA4705EA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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