OPA655P Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
OPA655P is a wideband FET-input operational amplifier from Texas Instruments featuring a very low bias current of 125 pA at 25°C and an input offset voltage below 2000 µV for high-precision signal conditioning. It delivers a wide gain-bandwidth product suited for photodetector transimpedance amplifiers and active filter designs operating at high frequencies. Available in an 8-pin PDIP package with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- OPA655P Datasheet PDF
- Category
- Integrated Circuit
- 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 OPA655P?
- Ultra-low FET input bias current of 125 pA at 25°C minimizes loading on high-impedance sensor sources
- Input offset voltage below 2000 µV and 55 dB minimum CMRR enable precision DC and AC signal conditioning
- Voltage-feedback architecture with frequency compensation supports stable transimpedance and inverting amplifier configurations
What is OPA655P used for?
OPA655P is widely used in photodiode transimpedance amplifier (TIA) front ends for optical receivers, laser rangefinders, and spectroscopy instruments where sub-pA input bias current is essential to avoid signal distortion. The high-impedance FET input makes it ideal for electrometer-grade charge amplifiers and pH electrode buffer circuits requiring input impedance above 1 TΩ. It is also used in active bandpass filters and precision integrators in medical instrumentation and scientific data acquisition systems.
What are the specifications of OPA655P?
| Pbfree Code | No |
| YTEOL | 0 |
| Amplifier Type | OPERATIONAL AMPLIFIER |
| Architecture | VOLTAGE-FEEDBACK |
| Average Bias Current-Max (IIB) | 0.008 µA |
| Bias Current-Max (IIB) @25C | 0.000125 µA |
| Common-mode Reject Ratio-Min | 55dB |
| Common-mode Reject Ratio-Nom | 70dB |
| Frequency Compensation | YES |
| Input Offset Voltage-Max | 2000 µV |
| JESD-30 Code | R-PDIP-T8 |
| Low-Bias | YES |
| Low-Offset | NO |
| Micropower | NO |
| Neg Supply Voltage Limit-Max | -5.5 V |
| Neg Supply Voltage-Nom (Vsup) | -5 V |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP8,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Power | NO |
| Programmable Power | NO |
| Qualification Status | Not Qualified |
| Slew Rate-Min | 200V/us |
| Slew Rate-Nom | 290V/us |
| Supply Current-Max | 31mA |
| Supply Voltage Limit-Max | 5.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | BICMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Unity Gain BW-Nom | 240000 |
| Voltage Gain-Min | 320 |
| Wideband | YES |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
Where can I find the OPA655P datasheet?
OPA655P Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for OPA655P?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the input bias current of OPA655P, and why is it critical for photodiode TIA designs?
OPA655P has a maximum input bias current of 125 pA at 25°C, which is low enough to avoid generating significant voltage error across large transimpedance feedback resistors in the range of 1 MΩ to 100 MΩ. In photodiode TIA applications, keeping bias current below the dark current of the detector, typically 1 nA to 10 nA, ensures the output offset remains within the dynamic range of the downstream ADC.
What input offset voltage does OPA655P specify, and how does it affect precision amplifier accuracy?
OPA655P specifies a maximum input offset voltage of 2000 µV (2 mV), which introduces a DC error at the output equal to 2 mV multiplied by the closed-loop gain. For a gain of 10 V/V this translates to a 20 mV output offset, which can be trimmed externally using the offset null pins available on the 8-pin PDIP package to achieve sub-millivolt accuracy.
How does OPA655P compare to bipolar-input op-amps for high-impedance sensor signal conditioning?
Unlike bipolar-input op-amps with bias currents of 100 nA to several µA, OPA655P uses a FET input stage with only 125 pA bias current at 25°C, a difference of 3 orders of magnitude. This makes OPA655P far better suited for interfacing with high-impedance sources above 1 MΩ, such as pH electrodes, charge sensors, or photodiodes, where bipolar inputs would introduce unacceptable loading and offset errors.
For a photodetector preamplifier PCB, how does the 8-pin PDIP package of OPA655P support prototyping?
The 8-pin PDIP package of OPA655P has 2.54 mm through-hole pin pitch, making it directly compatible with standard breadboards and DIP sockets for rapid prototyping of transimpedance amplifier circuits with feedback resistors from 10 kΩ to 10 MΩ. This simplifies lab evaluation of bandwidth and noise performance before committing to a surface-mount layout in production.
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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.
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