OPA130UA - 1 MHz FET-Input Op Amp, 20 pA Bias, 530 uA Iq | Texas Instruments
Teilenummer: OPA130UA ✓ AktivOPA130UA Übersicht
A FET-input operational amplifier is an amplifier whose input stage uses field-effect transistors instead of bipolar junctions. This input topology places an astronomically small bias current into the input pins, which makes the device insensitive to source resistance and therefore ideal for photodiode sensors, pH probes, high-impedance dividers, and capacitive sensing front ends. In the product taxonomy, the OPA130UA sits in the amplifier IC family, specifically the precision and general-purpose operational amplifier class, which is a subset of analog signal-conditioning integrated circuits used in instrumentation, test and measurement, industrial control, and battery-powered portable equipment.
Key features of the OPA130UA include 1 MHz gain-bandwidth product, 2 V/us slew rate, 20 pA typical input bias current, and 530 uA typical quiescent current drawn from a supply range of +/-2.25 V to +/-18 V. Because the quiescent current stays near half a milliamp per amplifier, the OPA130 series is well suited to portable and battery-operated designs where every microamp of supply current reduces run time. The device is offered in single (OPA130), dual (OPA2130), and quad (OPA4130) versions with identical specifications, so a designer can standardize on one family across analog and mixed-signal boards.
The precision dc architecture combines laser-trimmed input offsets with low temperature drift and low voltage noise, delivering stable dc performance in instrumentation chains where offset error directly limits measurement resolution. Low bias current also removes the guard-ring and leakage-compensation networks normally required around megaohm-scale sources, which reduces board area and system error budgets.
Typical applications include low-level current-to-voltage converters, pH and conductivity probe amplifiers, photodiode and optical sensor receivers, capacitive touch and proximity sensing front ends, battery-powered data loggers, audio and communication line stages, and general-purpose precision signal conditioning.
When designing with the OPA130UA, pay attention to input common-mode range versus supply voltage, keep the feedback network short and shielded from high-impedance nodes to avoid parasitic oscillation, and place a small bypass capacitor directly on each supply pin to preserve the low-noise behavior the device is known for.
This page combines manufacturer specifications, drop-in replacement analysis, and applied design guidance so engineers can select the amplifier, plan the surrounding circuitry, and qualify a second source without rebuilding the schematic.
Drop-in-Alternativen für OPA130UA – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit OPA130UA (gleiche Bauform und Footprint) – abweichend in Input Bias Current, Package, Amplifier Type, Slew Rate, Gain-Bandwidth Product.
OPA277UA
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
OPA134UA
✅ Drop-In ⚠️ Spezifikationen ungeprüftPreis auf Anfrage
Datenblatt ansehen →OPA140UA
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
OPA260UA
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
AD8605ARZ
✅ Drop-InPreis auf Anfrage
Datenblatt ansehen →OPA130UA Grenzwerte & elektrische Eigenschaften
| Amplifier Type | Single, General Purpose, FET-Input Operational Amplifier |
| Number of Circuits | 1 |
| Gain-Bandwidth Product | 1 MHz |
| Slew Rate | 2 V/us |
| Input Bias Current | 20 pA typical |
| Ruhestrom | 530 uA typical |
| Supply Voltage Range | +/-2.25 V to +/-18 V |
| Gehäuse | 8-pin SOIC (D), surface mount |
| Montageart | Surface Mount |
| Series | OPAx130 (OPA130 / OPA2130 / OPA4130) |
OPA130UA Pin-Konfiguration
| Pin 1 | NC — Not connected (per datasheet) |
| Pin 2 | IN- — Inverting input |
| Pin 3 | IN+ — Non-inverting input |
| Pin 4 | V- — Negative supply connection |
| Pin 5 | NC — Not connected (per datasheet) |
| Pin 6 | OUT — Output |
| Pin 7 | V+ — Positive supply connection |
| Pin 8 | NC — Not connected (per datasheet) |
Typische Anwendungen
OPA130UA ist geeignet für 6 Anwendungs: Photodiode and Optical Sensor Signal Conditioning, Battery-Powered Data Loggers and Portable Instruments, Chemical and Bio-Sensor Probe Interfaces, Capacitive Touch and Proximity Sensing Front Ends, Precision Current-to-Voltage Conversion, Audio and Communication Line Stages.
Photodiode and Optical Sensor Signal Conditioning
The OPA130UA is a natural fit for photodiode front ends because its 20 pA input bias current adds almost no error to the small photocurrents these sensors generate, even with megaohm feedback networks. With a 1 GOhm feedback resistor a 20 pA bias produces only about 20 uV of offset, while a conventional bipolar-input amplifier drawing nanoamperes would contribute millivolts and swamp the signal. The 530 uA quiescent current keeps the analog section from dominating battery drain in portable optical instruments, and the 2 V/us slew rate is more than sufficient for sensor bandwidths in the hundreds of hertz to low kilohertz range. Designers typically pair it with the TI instrumentation front end and keep the summing node guarded to suppress surface leakage.
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Battery-Powered Data Loggers and Portable Instruments
Standby current dominates the design life of a field logger, and the OPA130UA draws only 530 uA of quiescent current while still delivering 1 MHz of gain-bandwidth product and 2 V/us slew rate. That combination lets a single amplifier serve as the sensor buffer, gain stage, and active filter in a compact, low-power signal chain running from two AAA cells or a lithium coin cell. Because the input bias current is only 20 pA, the leakage error from board contamination and humidity stays below the useful resolution of typical electrochemical or resistive sensors. The single 8-pin SOIC footprint also keeps the analog front end small, which matters when the whole logger has to fit in a sealed enclosure with limited thermal mass.
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Chemical and Bio-Sensor Probe Interfaces
pH, conductivity, and electrochemical probes present extremely high source impedances, often above 1 GOhm, so input bias current is the dominant error source in the measurement chain. The OPA130UA's 20 pA input bias current contributes roughly 20 mV of error across a 1 GOhm probe impedance, versus volts for a nanoamp-level bipolar input, and it needs no offset nulling network to stay usable. The low quiescent current of 530 uA also allows continuous operation from a single low-voltage supply without the amplifier dominating the probe's own consumption. A 1 MHz bandwidth is ample for the slow electrochemical time constants involved, and the 8-pin SOIC package is easy to place close to the probe connector to minimize parasitic pickup.
Empfohlen
Capacitive Touch and Proximity Sensing Front Ends
Capacitive sensing front ends work with very small charge-transfer signals, so the amplifier input must contribute negligible bias current and very low noise while operating from a low-voltage supply. The OPA130UA's 20 pA input bias current keeps the standing error on the sensor electrode below the detection threshold of typical capacitive front ends, and its 530 uA quiescent current suits battery-powered touch panels and access controls. The 1 MHz gain-bandwidth product is sufficient for the short acquisition windows used in charge-transfer and relaxation-oscillator sensing methods, while the 2 V/us slew rate lets the amplifier settle quickly between measurement cycles. Common practice is to place the device adjacent to the electrode with guarded traces to suppress humidity-dependent leakage.
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Precision Current-to-Voltage Conversion
In a shunt-based current measurement, the amplifier input bias current flows through the shunt and produces an offset that subtracts directly from the reading. With 20 pA of bias current the OPA130UA adds negligible error next to typical shunt currents in the microamp-to-milliamp range, and the low noise floor of a precision FET-input architecture preserves small-signal resolution. The 530 uA quiescent current keeps the converter efficient in portable power monitors and battery management test equipment, while the 1 MHz bandwidth is ample for bandwidths well above the kilohertz update rates typical of energy metering. A unity-gain or modest-gain configuration around the shunt keeps the layout simple and the feedback loop short.
Empfohlen
Audio and Communication Line Stages
The OPA130UA works well as a low-level audio line and communication receiver stage because its 1 MHz gain-bandwidth product provides ample margin over the 20 kHz audio band, and the FET input avoids the crossover distortion that bipolar input stages can introduce at low signal levels. The 530 uA quiescent current is attractive for powered-line and portable audio accessories where the amplifier runs continuously. Because the device is specified for general-purpose portable applications, it is frequently used in microphone preamplifier and headphone-driver-adjacent signal paths where source impedance is high. Check the common-mode input range against the signal swing of the source and the supply voltage, and confirm output swing capability before committing to a headroom-limited rail.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für OPA130UA – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | OPA277UA | OPA134UA | OPA140UA | OPA260UA | AD8605ARZ |
|---|---|---|---|---|---|---|
| Package | SOIC-8 (D) | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Number of Amplifiers | 1 | 1 | 1 | 1 | 1 | 1 |
| Gain-Bandwidth Product | 1 MHz | 1 MHz | 8 MHz | 10 MHz | 40 MHz | 10 MHz |
| Input Bias Current | 20 pA | 1 pA | 5 pA | 30 pA | 50 pA | 1 pA |
| Quiescent Current | 530 uA | 1 mA | 3 mA | 1.7 mA | 5 mA | 1 mA |
| Supply Voltage Range | +/-2.25 V to +/-18 V | +/-2.25 V to +/-18 V | +/-2.5 V to +/-18 V | 4.5 V to 36 V | 4.5 V to 36 V | 1.8 V to 5.5 V |
| Slew Rate | 2 V/us | 0.8 V/us | 20 V/us | 20 V/us | 25 V/us | 12 V/us |
Wichtigste Unterscheidungsmerkmale
- Lowest supply current in the drop-in set while keeping precision dc performance (vs. OPA277UA)
- Bias current matched to the highest source impedance of the group while retaining moderate speed (vs. OPA140UA)
- Wide bipolar supply range for industrial and instrumentation rails (vs. AD8605ARZ)
- Purpose-built low-power precision part rather than a speed-optimized amplifier (vs. OPA260UA)
Designhinweise
Keep the summing node physically small and isolate it from heat sources and fast-switching nodes. With 20 pA of input bias current, even a few hundred picofarads of stray capacitance at the inverting input combined with high source resistance can create microseconds of settling time that shows up as measurement drift. Place the device close to the sensor or connector, use a guarded trace around the input pin driven by a low-potential node, and route the feedback resistor directly between pins 2 and 6 without test pads or probe loops in the path.
Decouple each supply pin directly with a 100 nF ceramic capacitor and add a bulk capacitor of a few microfarms on the positive rail close to the device. The OPA130UA operates from +/-2.25 V to +/-18 V, so in dual-supply systems bypass both rails separately rather than referencing the ground return through a single capacitor. Low-impedance local decoupling is what preserves the low-noise behavior that this amplifier family is chosen for; long supply traces or shared filter networks reintroduce supply noise directly into the output.
Do not assume the 530 uA quiescent current is the total system demand. A feedback network with a low-value resistor on a high-gain stage, or a load that sinks current from the output, adds to supply draw, and at 530 uA the device has no margin for continuous output loading on a low-voltage rail. Also check the common-mode input range against the actual signal and supply combination; with single-supply operation below roughly 4.5 V, the usable input range narrows and the source must be biased into the valid window rather than grounded directly.
When the amplifier sits close to a switching supply or a motor driver, keep the analog loop area small and keep the input traces away from the power inductor and switch node. Because bias current is already at 20 pA, the remaining error is dominated by induced leakage and pickup rather than by the amplifier itself. Star the analog ground return to the device ground pin rather than daisy-chaining it behind a noisy section, and consider a small ferrite bead plus a local bulk capacitor on the supply pin if supply ripple is visible at the output.
Compliance-Informationen
The OPA130UA is listed as an active, standard general-purpose grade single amplifier in the 8-pin SOIC package. RoHS, REACH, AEC-Q100 and lead-free status were not explicitly stated in the retrieved manufacturer or distributor listings, so they are recorded as unknown rather than assumed; confirm them against the current manufacturer material declarations before release.
