OPA602AU - 6.5MHz Precision Difet Op Amp, SOIC-8 | TI
MPN: OPA602AU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $9.8 | $980.00 |
| 500 | $8.9 | $4,450.00 |
| 1,000 | $8.1 | $8,100.00 |
Drop-in alternatives for OPA602AU β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
OPA627AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
OPA627BP
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
OPA637AU
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$35.86 / Unit
View Datasheet βOPA602BM
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
OPA602AU Maximum Ratings & Electrical Characteristics
| Amplifier Type | High-Speed Precision Difet Operational Amplifier |
| Number of Channels | 1 |
| Bandwidth | 6.5 MHz |
| Slew Rate | 35 V/us |
| Input Offset Voltage (Max) | +/-250 uV |
| Input Bias Current (Max) | +/-1 pA |
| Settling Time (to 0.01%) | Fast settling, unity-gain stable |
| Capacitive Load Drive | up to 1500 pF |
| Rated Load Condition | 1 kOhm in parallel with 500 pF |
| Operating Temperature Range | -25C to +85C |
| Package | SOIC (D), 8 pins |
| Mounting Type | Surface Mount |
| Input Process Technology | Difet (dielectrically isolated FET), laser-trimmed |
| Stability | Unity-gain stable |
| RoHS Status | Compliant |
OPA602AU Pin Configuration
| Pin 1 | TRIM A β Offset null trim terminal A |
| Pin 2 | -IN β Inverting input |
| Pin 3 | +IN β Non-inverting input |
| Pin 4 | V- β Negative supply |
| Pin 5 | TRIM B β Offset null trim terminal B (trim pot to V-) |
| Pin 6 | OUT β Output |
| Pin 7 | V+ β Positive supply |
| Pin 8 | NC β Not connected (per datasheet) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
OPA602AU is suitable for 6 applications: Precision Instrumentation Front Ends, Optoelectronics / Photodiode Amplifiers, Sonar and Ultrasound Receive Chains, Data Acquisition and Pulse Amplification, Active Filters and Precision Integrators, Test and Measurement Equipment.
Precision Instrumentation Front Ends
The OPA602AU fits precision instrumentation signal chains that need both DC accuracy and fast settling, with +/-250 uV maximum offset, +/-1 pA maximum bias current, and 6.5 MHz bandwidth from the Difet process. In a transducer amplifier, the picoampere bias current keeps loading on high-impedance bridges and photodiode outputs negligible, while laser-trimmed offset minimizes system-level calibration requirements. Placed as the first gain stage ahead of a 16-bit or higher ADC, the amplifier settles to 0.01% fast enough for multiplexed channels and pulse-style sampling. The unity-gain stability and ability to drive 1500 pF make it tolerant of cable and filter capacitance on test-system inputs, and the offset trim pins allow fine zeroing of residual system offset during production calibration.
Recommended
Optoelectronics / Photodiode Amplifiers
Photodiode and photomultiplier receivers benefit directly from the OPA602AU's +/-1 pA maximum bias current, which sets the theoretical floor of dark-current error, and its 6.5 MHz bandwidth, which supports megahertz-class optical data links and light detectors. The Difet input keeps current noise low at the large feedback resistors (1 MOhm to 1 GOhm) typical of transimpedance stages, so shot-noise-limited sensitivity is achievable. TI explicitly lists optoelectronics as a target application. In practice the part is wired as a transimpedance amplifier with the photodiode into the inverting input; the compensation capacitor is sized against diode capacitance, and the op amp's tolerance of capacitive loading helps with output cable capacitance. Operate within the -25C to +85C grade for stable dark-current behavior.
Recommended
Sonar and Ultrasound Receive Chains
Sonar and ultrasound front ends are a datasheet-listed application for the OPA602: the 35 V/us slew rate and fast settling to 0.01% preserve pulse fidelity from transducer receive bursts, while the +/-250 uV maximum offset prevents baseline error in time-gain-compensation stages. A typical chain places the OPA602AU as a fixed-gain preamplifier immediately after the transducer matching network, exploiting unity-gain stability and 1500 pF load tolerance for filter and cable capacitance. The 6.5 MHz bandwidth covers most diagnostic-ultrasound receive bands, and low distortion across the band minimizes harmonic artifacts in imaging. For deeper front ends, pair it with a variable-gain amplifier stage and a fast ADC; the picoampere bias current also suits high-impedance hydrophone elements in sonar arrays.
Recommended
Data Acquisition and Pulse Amplification
High-speed settling makes the OPA602AU a strong candidate for ADC drivers and pulse amplifiers in data-conversion systems: high slew rate and fast settling to 0.01% allow accurate signal processing in pulse and data-conversion applications, per the TI datasheet. Driving an ADC input, the amplifier recovers from input sampling glitches quickly, preserving accuracy at kHz-to-MHz sample rates. The low +/-1 pA bias current allows direct interface with high-impedance charge-integrator outputs, and the offset trim pins support system calibration. Because TI rates the device with 1 kOhm parallel 500 pF loading, RC anti-alias filters of that order on the ADC input are well within its drive capability, though an isolation resistor is recommended for larger capacitors to maintain phase margin.
Recommended
Active Filters and Precision Integrators
Precision active filters, integrators, and log-amp front ends exploit the OPA602AU's picoampere bias current, which keeps integrator droop at femtoampere-second levels and prevents filter corner drift from input leakage. The 6.5 MHz bandwidth permits filters with corners well into the hundreds of kilohertz while retaining loop gain for accurate Q and gain definition, and low distortion preserves filter stopband performance. In an integrator, the Difet input means reset-switch charge injection dominates error rather than op amp bias, simplifying calibration. The unity-gain stability protects against oscillation in Sallen-Key topologies, and the ability to drive 1500 pF accommodates large filter capacitors directly. Use the offset trim pins to null residual integrator offset before calibration of the overall system.
Recommended
Test and Measurement Equipment
Bench instruments, data-loggers, and automated-test channels use the OPA602AU as an input amplifier where a fast, accurate buffer in front of the measurement core is required. The combination of +/-250 uV maximum offset, +/-1 pA bias current, and fast settling to 0.01% supports both DC accuracy specifications and quick per-channel settling in multiplexed scanners. Its tolerance of 1500 pF capacitive loads makes it forgiving of probes, long cables, and relay-mux capacitance on instrument inputs. Within the -25C to +85C grade it covers typical laboratory environments, and offset trim supports factory calibration against traceable references. For output stages that must drive 50-Ohm systems, follow the OPA602AU with a BUF634-class buffer to keep the op amp within its thermal and load limits.
Recommended
Recommended Products Summary
Engineering reference data for OPA602AU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OPA627AU | OPA627BP | OPA637AU | OPA602BM |
|---|---|---|---|---|---|
| Package | SOIC-8 (D) | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | TO-99 metal can - differs |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Bandwidth | 6.5 MHz | 16 MHz | 16 MHz | 80 MHz | 6.5 MHz |
| Slew Rate | 35 V/us | 55 V/us | 55 V/us | 135 V/us | 35 V/us |
| Stability | Unity-gain stable | Unity-gain stable | Unity-gain stable | Stable at gain >= 5 | Unity-gain stable |
| Bias Current Class | +/-1 pA max | pA class (FET) | pA class (FET) | pA class (FET) | +/-1 pA max (B grade tighter) |
| Temperature Range | -25C to +85C | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Performance Grade | A grade | A grade | B grade (tighter limits) | A grade | B grade (tighter limits) |
Key Differentiators
- Unity-gain stability at 6.5 MHz bandwidth (vs OPA637AU)
- Lower cost for equivalent DC precision class (vs OPA627AU)
- Surface-mount SOIC-8 packaging (vs OPA602BM)
Design Notes
The OPA602AU is unity-gain stable and drives up to 1500 pF, but large capacitive loads combined with feedback-network capacitance can erode phase margin. If a larger load capacitor is present, add an isolation resistor (typically 50-100 Ohm) between OUT and the load, or place the capacitor inside the feedback loop of a transimpedance-style topology. TI rates all specifications with a 1 kOhm resistor in parallel with a 500 pF load, so designs near that loading are within validated conditions.
The +/-1 pA maximum bias current is only realized with proper guarding and board hygiene: leakage across the PCB can exceed the input current by orders of magnitude. Ring the +IN and -IN traces with guard rings driven from a low-impedance potential, clean flux thoroughly, and consider Teflon or lifted-lead connections for feedback resistors above 1 MOhm. Also note the offset trim range exceeds the +/-250 uV maximum offset - over-trimming injects trim-pot drift into the signal path, so trim minimally after thermal soak.
The OPA602AU is specified for operation on symmetrical supplies within its rated range; consult the TI datasheet table for absolute maximum supply before designing the rail. Decouple V+ and V- with 0.1 uF ceramics placed within a few millimeters of pins 7 and 4, plus 4.7-10 uF bulk per rail. Estimated: at quiescent current of a few milliamps and +/-15 V rails, self-heating is below 100 mW, so no thermal pad is required in the SOIC-8; verify at maximum output current into low-impedance loads.
Compliance Information
RoHS compliance per distributor listing; detailed REACH/halogen status should be confirmed on the TI product page.
