OPA655U-1 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments OPA655U-1 is a wideband FET-input operational amplifier with 400 MHz bandwidth and voltage-feedback architecture in an 8-pin SOIC package. Offers ultra-low input bias current of 0.008 µA and 2 mV maximum offset voltage for precision high-speed signal processing. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- OPA655U-1 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 OPA655U-1?
- 400 MHz wideband FET input enabling high-speed signal amplification with less than 0.008 µA average bias current for accurate charge-sensitive measurements
- Voltage-feedback architecture with frequency compensation providing stable closed-loop operation across a wide range of gain settings
- Ultra-low input offset voltage of 2000 µV maximum with 70 dB typical common-mode rejection ratio for precision differential signal processing
- 8-pin SOIC package with compact SMD footprint suitable for high-density analog signal-chain PCB layouts
What is OPA655U-1 used for?
The OPA655U-1 is optimized for photodiode transimpedance amplifiers, high-speed data-acquisition front ends, and optical receiver circuits where FET inputs minimize loading on high-impedance sources while maintaining 400 MHz bandwidth. Its low bias current of 0.008 µA and low offset voltage make it effective in charge-amplifier configurations for capacitive sensor readout in scientific instrumentation and medical imaging systems. The device also suits wideband active filter stages and high-speed test-and-measurement equipment that requires flat frequency response and low distortion at signal frequencies exceeding 100 MHz.
What are the specifications of OPA655U-1?
| 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-PDSO-G8 |
| 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 | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| 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 | YES |
| Technology | BICMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Unity Gain BW-Nom | 240000 |
| Voltage Gain-Min | 320 |
| Wideband | YES |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
Where can I find the OPA655U-1 datasheet?
OPA655U-1 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for OPA655U-1?
Compatible alternatives and drop-in replacements for OPA655U-1:
Frequently Asked Questions
What bandwidth does the OPA655U-1 provide and which high-speed signal-chain applications benefit most?
The OPA655U-1 delivers 400 MHz of small-signal bandwidth. This makes it well suited for photodiode transimpedance stages in optical receivers, active filter networks above 100 MHz, and ADC driver circuits where flat frequency response and low phase error across a wide band are required for accurate signal reconstruction without gain peaking or bandwidth rolloff distortion.
How low is the input bias current of the OPA655U-1 and why does it matter for charge-sensitive designs?
The OPA655U-1 has an average input bias current of 0.008 µA and a maximum of 0.000125 µA at 25°C. In charge-amplifier or transimpedance configurations connected to high-impedance photodiodes or capacitive sensors, this low bias current minimizes DC offset error and prevents slow charge accumulation that would otherwise degrade measurement accuracy or require frequent calibration cycles.
When is OPA655U-1 preferred over a bipolar-input op-amp for a 400 MHz transimpedance amplifier design?
OPA655U-1 is preferred when the source impedance is high, such as a reverse-biased photodiode with 10 pF to 100 pF capacitance, because FET inputs draw less than 0.008 µA versus tens of microamps for typical bipolar inputs. The lower bias current reduces output offset voltage, extends integration time in charge-sensitive circuits, and avoids exceeding the noise budget at the 400 MHz bandwidth limit of the amplifier.
What common-mode rejection ratio does the OPA655U-1 provide and how does it affect differential signal measurements?
The OPA655U-1 provides a minimum CMRR of 55 dB and a typical value of 70 dB. In differential sensor interfaces and instrumentation front ends, 70 dB CMRR suppresses common-mode noise — such as 50 Hz or 60 Hz power-line interference — by a factor of 3162, maintaining signal integrity at the 8-pin SOIC amplifier output even when the input lines carry several hundred millivolts of common-mode disturbance.
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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.
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