OPA4705EA/250 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments OPA4705EA/250 is a quad CMOS voltage-feedback operational amplifier with 10 fA typical bias current and 77 dB typical CMRR in a small outline package. It is optimized for low-leakage sensor signal conditioning and high-impedance instrumentation designs. Available in stock worldwide with competitive pricing.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 14
- Lifecycle
- ACTIVE
- Datasheet
- OPA4705EA/250 Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.2825(MOQ 20)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of OPA4705EA/250?
- Ultra-low 0.00001 µA (10 fA typical) input bias current enables direct interfacing with pH electrodes, photodiodes, and high-impedance chemical sensors
- 77 dB typical common-mode rejection ratio with voltage-feedback architecture ensures precision signal integrity in differential measurement circuits
- Quad op-amp in a single package with rail-to-rail output capability minimizes board space in multichannel sensor conditioning designs
What is OPA4705EA/250 used for?
The OPA4705EA/250 is ideally suited for ultra-high-impedance sensor interfaces such as pH electrodes, ionization detectors, and piezoelectric sensors where input bias current must remain below 1 pA. Its 4-channel integration in a single package enables compact multichannel instrumentation front-ends for analytical chemistry instruments and medical diagnostic equipment. The device also fits precision transimpedance amplifier stages in optical sensors and photodiode arrays operating from single or dual supply rails.
What are the specifications of OPA4705EA/250?
| Pbfree Code | Yes |
| YTEOL | 1 |
| Amplifier Type | OPERATIONAL AMPLIFIER |
| Architecture | VOLTAGE-FEEDBACK |
| Average Bias Current-Max (IIB) | 0.00001 µA |
| Bias Current-Max (IIB) @25C | 0.00001 µA |
| Common-mode Reject Ratio-Min | 66dB |
| Common-mode Reject Ratio-Nom | 77dB |
| Frequency Compensation | YES |
| Input Offset Current-Max (IIO) | 0.00001 µA |
| Input Offset Voltage-Max | 5000 µV |
| JESD-30 Code | R-PDSO-G14 |
| JESD-609 Code | e4 |
| Low-Bias | YES |
| Low-Offset | NO |
| Micropower | YES |
| Neg Supply Voltage Limit-Max | -6.6 V |
| Neg Supply Voltage-Nom (Vsup) | -5 V |
| Number of Functions | 4 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP14,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power | NO |
| Programmable Power | NO |
| Qualification Status | Not Qualified |
| Slew Rate-Nom | 0.6V/us |
| Supply Current-Max | 1mA |
| Supply Voltage Limit-Max | 6.6V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Unity Gain BW-Nom | 1000 |
| Voltage Gain-Min | 100000 |
| Wideband | NO |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 2 |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
Where can I find the OPA4705EA/250 datasheet?
OPA4705EA/250 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for OPA4705EA/250?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How low is the input bias current of OPA4705EA/250 and which sensor types benefit most from this specification?
The OPA4705EA/250 has a maximum input bias current of 0.00001 µA, equivalent to 10 fA, which is low enough to buffer pH glass electrodes with impedances above 1 GΩ without introducing measurable DC offset errors. This ultra-low bias current also suits ionization current sensors, MEMS charge output transducers, and precision charge amplifiers in analytical instruments.
What CMRR does OPA4705EA/250 provide and how does this affect differential measurement accuracy?
The OPA4705EA/250 achieves a typical common-mode rejection ratio (CMRR) of 77 dB with a minimum of 66 dB. In a differential measurement with 1 V common-mode noise at 50 Hz, 77 dB CMRR reduces the noise contribution at the output to below 140 µV, maintaining measurement accuracy in industrial environments with significant power-line interference.
For a 4-channel pH monitoring system, how does using OPA4705EA/250 in a single package compare to using four discrete op-amps?
Using OPA4705EA/250 integrates all 4 op-amp channels into one package, reducing PCB area by approximately 60% compared to four separate single-channel CMOS op-amp SOT-23 packages. The matched internal devices also improve channel-to-channel offset and bias current matching to within 10 fA across temperature, ensuring consistent pH reading accuracy across all 4 electrode inputs simultaneously.
What tape reel quantity does the OPA4705EA/250 part number indicate and why does this matter for production procurement?
The '/250' suffix indicates the OPA4705EA is packaged on a 250-piece tape and reel, compared to larger standard 2500-piece reels. This smaller reel quantity reduces minimum order quantity and upfront inventory cost by approximately 90% for low-to-medium volume production runs, making it practical for prototyping batches or production volumes below 1000 units per year.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 20+ | $1.4250 | $28.50 |
| 50+ | $1.3395 | $66.97 |
| 150+ | $1.2825 | $192.38 |
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