OPA602AU/2K5 - 6.5MHz, 35V/us Precision Difet Op Amp | TI
MPN: OPA602AU/2K5 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.996 | $15.00 |
| 10 | $13.5 | $135.00 |
| 100 | $12.38 | $1,238.00 |
| 500 | $11.25 | $5,625.00 |
| 1,000 | $10.5 | $10,500.00 |
OPA602AU/2K5 Overview
An operational amplifier (op amp) is a high-gain differential voltage amplifier that forms the core building block of analog signal conditioning within the broader amplifier IC hierarchy. Precision op amps like the OPA602 minimize DC errors (offset, bias current, drift) while wideband types minimize AC errors; the OPA602 uniquely combines both classes using monolithic Difet construction, in which laser-trimmed input circuitry achieves offset and drift performance normally associated with precision bipolar amplifiers while retaining the ultra-low input bias current of a FET input stage.
Key features include a +/-1pA maximum input bias current, fast settling to 0.01%, unity-gain stability, and the ability to drive capacitive loads up to 1500pF. According to the TI product page, all specifications are rated with a 1k resistor in parallel with a 500pF load, and wide bandwidth with low distortion minimizes dynamic errors in pulse and data conversion signal chains.
The Difet process dielectrically isolates devices, giving an unusual combination of high speed and accuracy. High slew rate and fast settling allow accurate signal processing in pulse amplification, sample-hold buffering, DAC output conditioning, and optoelectronic receivers, where low input current protects high-impedance nodes from loading errors.
Typical applications include precision instrumentation front ends, sonar and ultrasound signal chains, and photodiode/optoelectronic amplification. In each case, the 6.5MHz bandwidth and 35V/us slew rate preserve signal fidelity at speed while 1pA bias current preserves DC accuracy.
Design consideration: the Β±5V to Β±18V supply range demands attention to supply decoupling; the OPA602 is stable at unity gain but output current capability (about 20mA class) should be respected when driving heavy loads.
This page synthesizes distributor pricing, verified drop-in alternatives, pinout data, and practical design notes not consolidated in the manufacturer datasheet. Pricing is referenced as of 2026-09-13.
Drop-in alternatives for OPA602AU/2K5 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with OPA602AU/2K5 (same form factor and footprint) β differing in Amplifier Type, Number of Channels, Package, Capacitive Load Drive, Packaging.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
OPA602AU
β Drop-Inβ In Stock
$8.1 / Unit
View Datasheet βOPA602AU/2K5E4
β Drop-Inπ Reference alternative (not in catalog)
OPA602AUE4
β Drop-Inπ Reference alternative (not in catalog)
OPA602AU/2K5 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 | Fast, to 0.01% |
| Supply Voltage Range | +/-5 V to +/-18 V |
| Output Current | 20 mA (class) |
| Open Loop Gain | 100 dB (class) |
| Capacitive Load Drive | Up to 1500 pF (unity-gain stable) |
| 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 |
| Packaging | Tape & Reel (TR), 2500 units |
| RoHS Status | Compliant |
OPA602AU/2K5 Pin Configuration
| Pin 1 | NC β Not connected (per datasheet) |
| Pin 2 | IN- β Inverting input |
| Pin 3 | IN+ β Non-inverting input |
| Pin 4 | V- β Negative supply |
| Pin 5 | NC β Not connected (per datasheet) |
| Pin 6 | OUT β Amplifier output |
| Pin 7 | V+ β Positive supply |
| Pin 8 | NC β Not connected (per datasheet) |
Typical Applications
OPA602AU/2K5 is suitable for 6 applications: Precision Instrumentation Front Ends, Optoelectronic / Photodiode Amplification, Sonar and Ultrasound Signal Chains, DAC Output Buffering and Pulse Amplification, Sample-and-Hold and Integrator Circuits, High-Impedance Sensor Buffering.
Precision Instrumentation Front Ends
The OPA602AU/2K5 fits precision instrumentation front ends because it combines laser-trimmed DC accuracy (+/-250uV max offset, +/-1pA max bias current) with 6.5MHz of bandwidth and a 35V/us slew rate, so DC error terms and AC error terms are simultaneously small. In sensor conditioning amplifiers, programmable-gain stages, and integrators, the FET input prevents loading of high-impedance transducer nodes, while the wide bandwidth preserves fast edge fidelity. Place the amplifier at the sensor with a gain-setting resistor network sized against the rated 1k-parallel-500pF load condition; unity-gain stability allows buffers without compensation networks. The -25C to +85C range covers most bench and industrial environments.
Recommended
Optoelectronic / Photodiode Amplification
Photodiode receivers demand amplifiers whose input bias current is far below the photocurrent of interest; the OPA602AU/2K5's +/-1pA maximum FET bias current meets this, and its 6.5MHz bandwidth supports fast optical pulse capture for data-rate-sensitive links. TI lists optoelectronics among the OPA602's target applications. In a transimpedance configuration, the 1500pF capacitive load tolerance and unity-gain stability help the amplifier cope with large photodiode junction capacitance; pair the feedback resistor with a small parallel capacitor for phase margin. The 35V/us slew rate prevents slew limiting on fast optical edges, keeping harmonic distortion low in analog optical measurements.
Recommended
Sonar and Ultrasound Signal Chains
The OPA602AU/2K5 is explicitly listed by TI for sonar and ultrasound applications, where transducer signals are fast, small, and delivered from high-impedance piezoelectric elements. The +/-1pA bias current keeps receive-path DC error negligible over the -25C to +85C range, while 6.5MHz bandwidth and 35V/us slew rate support the rise times of diagnostic ultrasound pulses. Use the amplifier in gain blocks ahead of the ADC driver, ensuring the total load stays near the rated 1k-parallel-500pF condition for datasheet-accurate performance. Its low distortion minimizes harmonic artifacts in receive beamforming and time-of-flight measurements, directly improving range resolution in pulse-echo systems.
Recommended
DAC Output Buffering and Pulse Amplification
High slew rate and fast settling time allow accurate signal processing in pulse and data conversion applications per the TI datasheet, making the OPA602AU/2K5 an effective DAC output conditioner. Fast settling to 0.01% ensures the amplifier reaches the DAC's LSB-level accuracy within short intervals, critical for arbitrary waveform generation and pulse amplitude accuracy. The unity-gain-stable architecture permits direct output buffering without external compensation, and the 1500pF capacitive load tolerance absorbs cable and filter capacitance. Keep the output load near the rated 1k-parallel-500pF condition and use +/-5V to +/-18V dual supplies matched to the DAC's signal span to avoid output headroom clipping.
Recommended
Sample-and-Hold and Integrator Circuits
Sample-and-hold acquisition stages benefit directly from the OPA602AU/2K5's combination of FET input and high speed: during hold mode, the +/-1pA bias current limits droop of the stored voltage on the hold capacitor, while in acquisition mode the 35V/us slew rate and 6.5MHz bandwidth reduce acquisition time. Similarly, in precision integrators the FET input makes integration capacitor leakage dominated by the capacitor itself rather than amplifier bias. Use polypropylene or C0G hold/integration capacitors to preserve the pA-level error budget, guard the summing node to control board leakage, and observe the -25C to +85C rating since droop doubles roughly with every 10C temperature rise.
Recommended
High-Impedance Sensor Buffering
Piezoelectric accelerometers, pH probes, and capacitive sensors present source impedances of megohms to gigohms; buffering them without loading error requires the OPA602AU/2K5's +/-1pA maximum bias current, which produces nanovolt-to-microvolt-scale error even at 1Gohm source impedance. The 6.5MHz bandwidth allows the same buffer to serve dynamic (vibration, pulse) measurements, not merely static readings. Configure as a unity-gain follower placed physically close to the sensor, drive the cable shield with the buffered output (guarding) to null cable capacitance effects, and rely on the 1500pF capacitive load drive to remain stable against long shielded cable runs.
Recommended
Recommended Products Summary
Engineering reference data for OPA602AU/2K5 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OPA602AU | OPA602AU/2K5E4 | OPA602AUE4 |
|---|---|---|---|---|
| Package | SOIC (D), 8 pins | SOIC (D), 8 pins - same | SOIC (D), 8 pins - same | SOIC (D), 8 pins - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Bandwidth | 6.5 MHz | 6.5 MHz | 6.5 MHz | 6.5 MHz |
| Slew Rate | 35 V/us | 35 V/us | 35 V/us | 35 V/us |
| Max Offset Voltage | +/-250 uV | +/-250 uV | +/-250 uV | +/-250 uV |
| Max Bias Current | +/-1 pA | +/-1 pA | +/-1 pA | +/-1 pA |
| Operating Temperature | -25C to +85C | -25C to +85C | -25C to +85C | -25C to +85C |
| Packaging / Quantity | Tape & Reel, 2500 units | Tube / cut tape, smaller quantities | Tape & Reel, 2500 units (green E4) | Tube / cut tape (green E4) |
Key Differentiators
- Difet process combines FET bias with bipolar-class accuracy (vs OPA602AU (generic commodity JFET op amps))
- High speed in a precision part (vs OPA602AM (same family, hermetic package))
- Robust capacitive load drive (vs OPA602AU (identical, but selection context vs typical precision amps))
Design Notes
Operate the OPA602AU/2K5 from dual supplies between +/-5V and +/-18V. Decouple both supply pins with 0.1uF ceramic capacitors placed within a few millimeters of pins 4 and 7, plus a 4.7uF-10uF bulk capacitor per rail. The Difet input stage tolerates large input common-mode swings, but keep inputs within the supply rails; exceeding Β±18V absolute maximum can damage the dielectrically isolated input structure. Estimated: at a 1k load and 10V output swing, output current is about 10mA, well within the ~20mA output current class - do not design for sustained heavier DC loads without checking thermal limits.
To realize the +/-1pA bias current specification, control board leakage at the summing node: guard rings around pins 2 and 3 driven from a low-impedance potential, clean flux residue, and use high-insulation-resistance PCB material or air gaps for teraohm-level circuits. A small series resistor (about 50-100 ohm) directly at the output isolates cable capacitance and improves phase margin with long lines. Keep the feedback path short and place the feedback resistor close to pin 2 to minimize parasitic capacitance that erodes bandwidth in transimpedance applications.
The OPA602 is unity-gain stable and drives up to 1500pF capacitive load, but datasheet accuracy is specified with a 1k resistor in parallel with 500pF - do not quote datasheet distortion figures at light capacitive-only loads. Also note the -25C to +85C temperature rating is narrower than industrial -40C to +125C; for automotive or extended-temperature designs this part is not qualified. Do not confuse OPA602AM (hermetic can package) with the SOIC AU version - they are not drop-in interchangeable.
Compliance Information
EU RoHS and REACH compliant per Abacus Technologies distributor compliance listing (PFAS: NO, DRC Conflict Free). E4-suffixed variants carry TI green designation. Not AEC-Q100 qualified.
