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OP470GSZ - 5nV/√Hz Quad Op-Amp, 16-SOIC | Analog Devices
OP470GSZ

OP470GSZ - 5nV/√Hz Quad Op-Amp, 16-SOIC | Analog Devices

The Analog Devices OP470GSZ is a high-performance monolithic quad operational amplifier featuring exceptionally low voltage noise of 5 nV/√Hz maximum at 1 kHz, housed in a 16-pin SOIC (wide-body, 0.295 inch / 7.50 mm) package. It integrates four independently compensated op-amps on a single die, delivering precision comparable to the industry-standard OP27 while reducing board area and power. The device operates over ±4.5 V to ±18 V dual supplies with a typical gain-bandwidth product of 6 MHz and a 2 V/µs slew rate. An operational amplifier is a high-gain DC-coupled electronic voltage amplifier with differential inputs and a single-ended output, used as a building block in nearly every analog signal chain. The OP470 belongs to the precision op-amp sub-category (hypernym hierarchy: operational amplifier → amplifier IC → analog IC → semiconductor device), characterized by ultra-low noise, low offset voltage, and high open-loop gain. It is produced on a bipolar process that yields the combination of very low input-referred voltage noise, low input bias current, and high DC accuracy required for instrumentation applications. Key features include a maximum input offset voltage of 0.4 mV (typical 0.1 mV), an offset voltage drift of 2 µV/°C maximum, an open-loop gain of 1000 V/mV minimum, and a common-mode rejection ratio (CMRR) of 110 dB minimum. The quad topology, low quiescent current per amplifier, and absence of crossover distortion support use in low-noise audio, active filter, and multi-channel instrumentation designs that demand channel-to-channel matching. The OP470 architecture uses laser-trimmed thin-film resistors and a thermally balanced layout to minimize offset and drift. Its low noise density and high gain make it suitable for amplifying low-level transducer signals, while the 6 MHz GBW comfortably handles audio-bandwidth and modest servo-loop applications. The output stage is class A/AB and swings within approximately 2 V of each rail on heavy loads, preserving headroom in ±15 V systems. Typical applications include professional audio mixing consoles and microphone preamplifiers, precision multi-channel data-acquisition front ends, active filters and equalizers, medical instrumentation such as ECG and patient-monitoring analog front ends, and industrial process-control signal conditioning where four matched low-noise channels reduce circuit complexity. Industrial sensor signal conditioning and strain-gauge amplification also benefit from the quad precision topology. When designing with this part, bias-current-cancellation paths must be considered at the inputs because the OP470 is a bipolar device. Source impedances above a few tens of kilo-ohms can introduce offset errors that exceed the datasheet spec unless cancellation is added. Decouple each supply pin with a 0.1 µF ceramic plus a bulk tantalum/electrolytic capacitor placed as close to the package as possible. This page synthesizes distributor pricing, drop-in cross-references, and practical design notes for the OP470GSZ, extending the manufacturer datasheet with selection guidance and comparisons not found at a single OEM source.

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OP470GSZ-REEL - Quad Low-Noise 6MHz Op Amp | Analog Devices
OP470GSZ-REEL

OP470GSZ-REEL - Quad Low-Noise 6MHz Op Amp | Analog Devices

The Analog Devices OP470GSZ-REEL is a high-performance monolithic quad operational amplifier (4-channel op amp) supplied in a 16-pin SOIC wide-body package delivered on a 7-inch tape-and-reel carrier. It delivers 5 nV/√Hz maximum input voltage noise at 1 kHz, a gain-bandwidth product of 6 MHz, and a slew rate of 2 V/µs while operating from ±4.5 V to ±18 V dual supplies. A quad operational amplifier integrates four independent, internally-compensated op amps on a single silicon die. Belonging to the linear IC family (operational amplifiers -> amplifiers -> analog ICs -> integrated circuits), the quad topology is the standard building block for signal conditioning stages that need matched channels - instrumentation buffers, active filters, multi-channel ADC front-ends, and audio pre-amplifiers - while saving board area versus four discrete op amps. Key features include 0.4 mV maximum input offset voltage, 2 µV/°C maximum offset voltage drift, 1000 V/mV minimum open-loop gain, 110 dB outstanding common-mode rejection, and four channels of low-noise amplification per package. The OP470 conforms to the industry-standard 14-pin DIP quad pinout and is pin-compatible with OP11, LM148/149, HA4741, HA5104, and RM4156 quad op amps, allowing drop-in upgrades of legacy designs. The internal architecture uses bipolar junction transistor (BJT) input stages that yield 5 nV/√Hz spectral noise density and stable unity-gain behavior without external compensation capacitors. The very-high open-loop gain (1000 V/mV min) and 110 dB CMRR translate into excellent DC accuracy and rejection of power-supply common-mode noise, making the OP470 well-suited for precision instrumentation and professional audio front-ends. Typical applications include high-quality audio pre-amplifiers and mixing consoles, precision instrumentation amplifiers, multi-pole active filters, industrial process control signal chains, and ADC driver stages that demand low noise and low offset simultaneously. When designing with the OP470, ensure input common-mode voltage stays within the supply rails, allow adequate PCB ground-plane area near the exposed paddle region, and place 100 nF ceramic supply-bypass capacitors within 5 mm of each supply pin. For lowest offset, use the offset-null pins or select the OP470FY/OP470GP grades that are pre-trimmed. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes beyond the manufacturer datasheet.

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OP90ARC/883C - Micropower Precision Op Amp | Analog Devices
OP90ARC/883C

OP90ARC/883C - Micropower Precision Op Amp | Analog Devices

The OP90ARC/883C is a high-performance, micropower operational amplifier from Analog Devices, designed for single-supply operation from 1.6 V to 36 V or dual supplies from ±0.8 V to ±18 V. Housed in a 20-lead ceramic leadless chip carrier (CLCC), this general-purpose op amp delivers precision performance with extremely low power consumption, making it ideal for battery-powered and portable instrumentation. An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output, used in signal conditioning, filtering, and mathematical operations. The OP90 belongs to the family of micropower op amps, which are optimized for low quiescent current while maintaining adequate bandwidth and precision. This category sits within linear amplifiers, which are fundamental building blocks in analog signal processing chains. Key features of the OP90ARC/883C include its wide supply range, low supply current, and high precision. The device operates from a single supply as low as 1.6 V, enabling use in low-voltage systems. Its micropower design ensures minimal power drain, extending battery life in portable devices. The 883C suffix indicates compliance with MIL-STD-883, a military standard for microcircuits, ensuring high reliability and extended temperature range operation. Technically, the OP90 uses a bipolar process with a precision input stage that provides low offset voltage and drift. The amplifier is internally compensated for unity-gain stability, simplifying design. Its output stage can swing close to the rails, maximizing dynamic range in single-supply applications. The device also features low input bias current, making it suitable for high-impedance sensor interfaces. Typical applications include battery monitoring, portable medical devices, sensor signal conditioning, and industrial control systems. The wide supply range and low power make it versatile for both 3 V and 5 V systems, as well as industrial 24 V rails. The military-grade version ensures operation in harsh environments. When designing with the OP90ARC/883C, consider its bandwidth and slew rate limitations for high-frequency applications. For precision DC applications, the low offset and drift are advantageous. Proper decoupling and layout are essential to maintain performance.

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OP90GSZ-REEL7 - Micropower Precision Op Amp | Analog Devices
OP90GSZ-REEL7

OP90GSZ-REEL7 - Micropower Precision Op Amp | Analog Devices

The OP90GSZ-REEL7 is a precision, micropower operational amplifier from Analog Devices, offered in an 8-pin SOIC package on a 7-inch tape and reel. It operates from a single supply of 1.6V to 36V or dual supplies of ±0.8V to ±18V, with a typical supply current of only 20 µA maximum, making it ideal for battery-powered and portable instrumentation. The input voltage range includes ground, enabling true single-supply operation with signals down to 0V. The amplifier features a gain bandwidth product of 20 kHz and a slew rate of 0.012 V/µs, optimized for low-frequency precision applications rather than high-speed signal processing. An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output, used in analog signal conditioning, filtering, and sensor interface circuits. It is a fundamental building block in analog electronics, forming the basis for comparators, buffers, integrators, and active filters. The OP90GSZ-REEL7 belongs to the category of precision op amps, which prioritize low offset voltage, low drift, and low noise over bandwidth, making them suitable for measurement and control systems where accuracy is paramount. Key features include a low supply current of 20 µA maximum, which extends battery life in portable devices, and an output drive capability of 5 mA minimum, allowing it to drive moderate loads. The input bias current is 4 nA, and the input offset voltage is typically 150 µV, ensuring high DC accuracy. The amplifier is specified for operation over the industrial temperature range of -40°C to +85°C, and it is RoHS compliant. The OP90GSZ-REEL7 uses a bipolar process technology that provides low noise and low offset, with a typical input voltage noise of 30 nV/√Hz. Its architecture includes a class AB output stage that can swing close to the rails, maximizing dynamic range in single-supply applications. The device is internally compensated for unity-gain stability, simplifying design. Typical applications include battery monitoring, portable medical devices, sensor signal conditioning, and low-power data acquisition systems. Its ability to operate down to 1.6V makes it suitable for 2-cell alkaline or single-cell lithium-ion battery applications. When designing with this amplifier, ensure that the common-mode input voltage does not exceed the specified range, and use appropriate decoupling capacitors on the supply pins to maintain stability. The low bandwidth means it is not suitable for high-frequency applications, but it excels in precision DC and low-frequency AC measurements.

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OPA124-W - 1.5 MHz Low-Noise Precision Op Amp | Texas Instruments
OPA124-W

OPA124-W - 1.5 MHz Low-Noise Precision Op Amp | Texas Instruments

The Texas Instruments OPA124-W is a single-circuit, low-noise, precision JFET-input operational amplifier with a 1.5 MHz gain-bandwidth product, 1.6 V/us slew rate, and operation from 10 V to 36 V supply rails. It is designed for precision signal conditioning and low-frequency measurement applications where input bias current and noise are important. The verified product information identifies the OPA124 family as a low-noise precision Difet operational amplifier and lists a maximum input bias current of 1 pA. An operational amplifier is an analog integrated circuit that uses differential feedback to amplify the difference between two input voltages. The OPA124-W belongs to the operational amplifier, analog amplifier, and signal-conditioning IC hierarchy, with a JFET-input architecture suited to high-impedance sources. Compared with bipolar-input precision amplifiers, the very low input bias current helps preserve source accuracy in sensors, transducers, and laboratory instrumentation. Key characteristics include a 1.5 MHz gain-bandwidth product, 1.6 V/us slew rate, 10 V to 36 V operating supply range, and approximately 2.5 mA typical supply current. The low-noise precision architecture makes the device useful for signal-chain conditioning, current-to-voltage conversion, instrumentation, and low-level analog measurement. The available verified data does not state the exact package for OPA124-W, so the package and its physical dimensions must be confirmed from the manufacturer ordering information before layout or replacement decisions. Typical use cases include conditioning outputs from high-impedance sensors, amplifying small differential signals, precision filter stages, and general-purpose analog instrumentation. In an instrumentation application, the amplifier's low bias current reduces loading of the source, while its 1.5 MHz bandwidth supports signal paths with moderate frequency content. The 10 V to 36 V supply range also provides flexibility for laboratory and industrial equipment operating from elevated rails. Designers should verify the exact pinout, package, common-mode range, offset voltage, noise density, and output-current limits against the current Texas Instruments datasheet before production release. The available distributor information confirms that OPA124-W is an amplifier product and that the OPA124 family is a low-noise precision Difet operational amplifier. This page combines verified product facts, sourcing links, engineering-oriented application guidance, and the limits of the available substitute data.

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OPA124P - 1pA Low-Noise Precision Op Amp | Texas Instruments
OPA124P

OPA124P - 1pA Low-Noise Precision Op Amp | Texas Instruments

The Texas Instruments OPA124P is a single-circuit, precision low-noise operational amplifier with a maximum input bias current of 1 pA, input offset voltage of 250 µV maximum, input voltage drift of 2 µV/°C maximum, and open-loop gain of 120 dB minimum. It operates from 10 V to 36 V total supply voltage, supports input common-mode voltages from -5 V to +18 V, and is packaged in an 8-pin PDIP. The OPA124P also provides external offset-adjustment pins for precision analog systems. An operational amplifier, or op amp, is a high-gain differential amplifier used to amplify voltage differences in feedback-controlled circuits. The precision op-amp category combines low offset, low drift, high open-loop gain, and common-mode rejection with a wide range of input and output voltage limits. Within the broader semiconductor hierarchy, the OPA124P belongs to the precision analog amplifier family, where the primary design goal is accurate signal conditioning rather than maximum speed or lowest power consumption. The OPA124P emphasizes measurement accuracy through a 1 pA maximum input bias current, 250 µV maximum input offset voltage, and 2 µV/°C maximum input voltage drift. Its 120 dB minimum open-loop gain and 100 dB minimum common-mode rejection ratio reduce errors in high-impedance instrumentation. The 10 V to 36 V operating supply range is compatible with split ±5 V to ±18 V laboratory rails, while the -5 V to +18 V input common-mode range supports signals extending beyond ground in appropriately biased systems. The amplifier uses a precision DiFET input stage and cascoded architecture to combine low noise with high input impedance and reduced flicker-noise susceptibility. Laser-trimmed thin-film resistors support low offset and low drift. Unlike many low-noise bipolar input amplifiers, the DiFET topology provides extremely low bias current, making the OPA124P useful where source resistance is high and amplifier input current could otherwise create unacceptable measurement errors. Typical uses include low-level sensor amplification, precision instrumentation, laboratory measurement equipment, photodiode signal chains, and high-impedance buffer stages. The 1 pA maximum bias current is especially valuable with sources whose output impedance is high, while the 250 µV maximum offset and 2 µV/°C maximum drift support stable DC measurements. The external offset-adjustment pins add calibration flexibility when system-level offset must be trimmed. When designing around the OPA124P, preserve adequate input and output common-mode range and verify settling performance for the selected gain and load. If the source impedance is high, account for input-bias-current error and capacitance, and keep sensitive input traces away from switching nodes. Offset trimming should follow the manufacturer circuit because external adjustment can change drift by approximately 0.3 µV/°C for each 100 µV of adjusted offset. This product page consolidates verified manufacturer-datasheet characteristics, distributor pricing, package information, and narrowly filtered PDIP alternatives. It also distinguishes documented electrical limits from unresolved procurement details, helping engineers evaluate the OPA124P without treating a substitute as interchangeable unless its package, pinout, temperature grade, and key parameters have been checked.

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OPA124U - Precision Low-Noise DiFET Op Amp | Texas Instruments
OPA124U

OPA124U - Precision Low-Noise DiFET Op Amp | Texas Instruments

Texas Instruments OPA124U is a precision, low-noise operational amplifier with a 1.5 MHz gain-bandwidth product, 1.6 V/µs slew rate, and input bias current rated at 5 pA maximum. The device is a single general-purpose amplifier in an 8-pin SOIC package, making it suitable for signal conditioning, buffering, analog measurement, filtering, and precision control applications. An operational amplifier is a voltage-controlled differential amplifier that uses feedback to amplify the voltage difference between its non-inverting and inverting inputs. Within the broader integrated-circuit hierarchy, an operational amplifier belongs to the amplifier IC family and, more specifically, the precision analog signal-conditioning category. Its applications include closed-loop gain, impedance conversion, active filtering, current sensing, instrumentation, and precision control. The OPA124U combines several low-noise precision characteristics. Its maximum input offset voltage is 250 µV, maximum input offset drift is 2 µV/°C, and minimum open-loop gain is 120 dB. Minimum common-mode rejection is 100 dB. The very low input bias current is particularly useful when the source impedance is high, because it reduces the voltage error created by bias current flowing through that impedance. Texas Instruments describes the OPA124 family as a low-noise precision DiFET operational amplifier. The OPA124U is the 8-pin SOIC configuration, and the available manufacturer-hosted datasheet states that offset-adjust capability was removed from the SOIC versions. The substrate connection and guard-trace arrangement require careful review because board leakage can otherwise undermine the benefit of the device’s low input bias current. Typical uses include precision current measurement, low-level sensor amplification, analog filtering, impedance buffering, laboratory instrumentation, and control systems. The 1.5 MHz gain-bandwidth product supports applications up to the amplifier’s practical frequency limit, while the 1.6 V/µs slew rate helps preserve large-signal behavior. Because the verified data does not provide complete supply-voltage, common-mode-voltage, output-current, or noise-density limits, those values should be confirmed in the manufacturer datasheet before design release. For a new PCB, provide a low-leakage input layout with guarded traces, adequate input-bias return paths, and decoupling close to the supply pins. When upgrading an existing design, verify pin 8 substrate handling, common-mode range, supply voltage, offset limits, and stability against the selected feedback network. This page combines verified manufacturer and distributor information with package, replacement, and engineering guidance intended to reduce replacement risk. This information page synthesizes verified distributor availability, manufacturer datasheet findings, drop-in candidate guidance, and practical design notes for engineers evaluating the OPA124U in precision analog circuits. It does not replace the complete Texas Instruments datasheet for production qualification or safety-critical design review.

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OPA129-W - 100 fA Ultra-Low Bias Current Op Amp | Texas Instruments
OPA129-W

OPA129-W - 100 fA Ultra-Low Bias Current Op Amp | Texas Instruments

The Texas Instruments OPA129-W is an ultra-low bias current Difet operational amplifier specified at 100 fA maximum input bias current, 2 mV maximum input offset voltage, and 10 uV/C maximum input offset voltage drift, supplied in an 8-pin SOIC (SO-8) surface-mount package. It is a single, general-purpose precision amplifier built on a monolithic dielectrically-isolated FET (Difet) input stage. An operational amplifier is a high-gain differential amplifier whose inverting and non-inverting inputs are compared and whose output drives the difference between them, typically with feedback to set closed-loop gain. The OPA129 belongs to the hierarchy low-bias op amp -> precision op amp -> voltage-feedback amplifier -> amplifier IC -> integrated circuit. Unlike bipolar input stages whose bias current rises with temperature and with resistor mismatch, the Difet dielectrically-isolated FET input stage draws essentially constant current from the supply, which is the defining characteristic engineers select it for. Key features of the OPA129 family include 100 fA maximum input bias current, 2 mV maximum input offset voltage, 10 uV/C maximum offset drift, a minimum open-loop gain of 94 dB, and low noise performance characterized at 10 kHz. Because bias current is the dominant error term in high-impedance front ends, the 100 fA rating translates to an input impedance in the hundreds of teraohms and to negligible loading on high source impedances. The part is a monolithic device offered in 8-pin PDIP and SO-8 packages, with the OPA129-W suffix designating the SO-8 option. Because the input stage is dielectrically isolated, the circuit is not sensitive to surface leakage in the same way a guard-ring-free bipolar or MOSFET-input design can be, and the part is insensitive to temperature cycling effects that degrade ordinary junction FETs. The amplifier is usable on split supplies as well as single-supply operation subject to the datasheet rail limits. Typical applications include photodiode and phototransistor transimpedance amplifiers, pH and chemical sensor instrumentation, picoammeter and electrometer front ends, precision current-to-voltage converters, high-impedance sensor interfaces, low-level current sensing, and capacitance-to-voltage front ends for touch and liquid-crystal sensing. The dominant design consideration is guarding and layout: because the part is specified to 100 fA, board contamination, flux residue, and humidity leakage across the input pins can exceed the device's own bias current. Keep input traces short, clean, and free of solder-flux residue, and use guarding where the operating environment is not controlled. This page synthesizes distributor availability, verified datasheet parameters, drop-in replacement candidates, and practical layout guidance for the OPA129-W, providing engineering context beyond the raw parameter table found on standard distributor listings.

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OPA129U - Ultra-Low Bias Current Op Amp | Texas Instruments
OPA129U

OPA129U - Ultra-Low Bias Current Op Amp | Texas Instruments

Texas Instruments OPA129U is a single ultra-low-bias-current Difet operational amplifier in an 8-pin SOIC package. Its headline specifications are 100 fA maximum input bias current, 1 MHz gain-bandwidth product, and 2.5 V/µs slew rate, with operation from ±5 V to ±18 V. The low-bias input stage makes the device suitable for precision current measurement and high-impedance sensing circuits. An operational amplifier is a voltage-amplifying, active circuit component that uses negative feedback to control gain, bandwidth, and output behavior. Within the semiconductor hierarchy, the OPA129U belongs to the precision-amplifier category, specifically the ultra-low-input-bias-current amplifier segment. Unlike bipolar-input amplifiers, whose input currents rise rapidly with temperature, the OPA129U uses dielectrically isolated FET, or Difet, inputs to suppress gate leakage and reduce bias-current error. The verified device data highlights a maximum input bias current of 100 fA, maximum input offset voltage of 2 mV, maximum offset drift of 10 µV/°C, and minimum open-loop gain of 94 dB. The 1 MHz gain-bandwidth product and 2.5 V/µs slew rate provide useful low-frequency precision performance rather than high-speed operation. The 8-pin SOIC package supports conventional surface-mount assembly and uses a standard single-amplifier footprint. OPA129U is intended for instrumentation, photodiode and detector interfaces, high-impedance transducers, capacitive sensors, and feedback networks where input bias current dominates measurement error. Its ultra-low bias current is especially valuable when the source impedance is high enough that even picoamp-level bias current creates a meaningful voltage offset. The ±5 V to ±18 V supply range supports bipolar analog rails commonly found in laboratory and industrial instrumentation. Typical applications include transimpedance preamplifiers, pH and electrochemical probe interfaces, photodiode amplifiers, precision current-to-voltage converters, and logarithmic amplifier modules used in scientific instruments. Because the bias current is exceptionally small, it also enables capacitive sensor front ends where the amplifier must contribute minimal error to the sensed charge. When laying out a high-impedance design, keep the input leads short, guard sensitive nodes against surface leakage, and avoid contamination from flux residue and moisture. Bias-current errors scale with source impedance, so a 1 GΩ source can produce a 100 fA-induced error of 100 nV before amplifier offset and noise are considered. Confirm that the selected operating point remains within the verified supply and common-mode limits. This page consolidates manufacturer and distributor findings for the OPA129U, documents the verified pricing reference as of 2026-10-29, identifies same-footprint drop-in alternatives, and adds practical bias-current and leakage guidance that is not presented as a simple distributor inventory summary.

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OPA130UA - 1 MHz FET-Input Op Amp, 20 pA Bias, 530 uA Iq | Texas Instruments
OPA130UA

OPA130UA - 1 MHz FET-Input Op Amp, 20 pA Bias, 530 uA Iq | Texas Instruments

The Texas Instruments OPA130UA is a single, low-power precision FET-input operational amplifier with a 1 MHz gain-bandwidth product, 20 pA input bias current, and 530 uA quiescent current, packaged in an 8-pin SOIC (D) package. 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.

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OPA131U - 4MHz 50pA FET Op Amp | Texas Instruments
OPA131U

OPA131U - 4MHz 50pA FET Op Amp | Texas Instruments

The Texas Instruments OPA131U is a single, general-purpose FET-input operational amplifier with 4 MHz gain-bandwidth product, 50 pA maximum input bias current, 750 µA power consumption, and an 8-pin SOIC package. It is designed for general-purpose signal conditioning where low input bias, low offset, and good dynamic performance are important. An operational amplifier, or op amp, is an analog integrated circuit that amplifies the voltage difference between its inverting and non-inverting inputs. The OPA131 belongs to the FET-input operational-amplifier family, where the input stage uses field-effect-transistor biasing rather than a bipolar input stage. This topology is useful when the source presents high impedance, because input bias current can disturb the source voltage and distort the measurement. The OPA131U combines a 4 MHz bandwidth with a 10 V/µs slew rate, according to the retrieved OPA131 data. Its maximum input offset voltage is 750 µV, and its input bias current is specified at no more than 50 pA. The wide supply range supports operation from ±18 V, while the low 750 µA power specification helps reduce system power when the amplifier operates across a broad range of analog signals. The device is available in an 8-pin SOIC package and is part of the broader OPAx131 family, which also includes dual and quad versions in industry-standard pinouts. Its general-purpose characteristics make it suitable for sensor interfaces, transimpedance amplification, audio signal conditioning, instrumentation, and buffering. The 10 V/µs slew rate supports faster signal transitions than a low-bandwidth precision-only amplifier, while the 4 MHz bandwidth is useful for moderate-frequency analog paths. OPA131U design decisions should focus on input-source impedance, supply voltage, output swing, noise requirements, and stability with capacitive loads. Because a single amplifier must be checked for bias-current effects and offset error, source resistance and bias-network resistance should be considered during input-stage design. The manufacturer product page and datasheet should be consulted for the complete electrical limits, pinout, and test conditions. This product data combines verified manufacturer and distributor information with application guidance and source citations. Pricing, availability, lifecycle status, and detailed comparison values must be confirmed against the latest distributor records before purchasing or releasing a production design.

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OPA131UA - 4MHz Low-Bias FET Op Amp | Texas Instruments
OPA131UA

OPA131UA - 4MHz Low-Bias FET Op Amp | Texas Instruments

The Texas Instruments OPA131UA is a single general-purpose FET-input operational amplifier with a 4 MHz gain-bandwidth product, 50 pA maximum input bias current, and 750 µA power consumption, housed in an 8-pin SOIC package. It supports a wide ±18 V supply range and provides a 10 V/µs slew rate for handling moderate-frequency signals with low distortion. A FET-input operational amplifier is an analog signal-conditioning amplifier whose input stage uses field-effect transistors instead of bipolar input transistors. This architecture provides very low input bias current, making it appropriate for high-impedance sensors, photodiode amplifiers, precision measurement circuits, and audio preamplifiers. Within the broader hierarchy, the OPA131UA is an operational amplifier, analog IC, and semiconductor designed to amplify differential voltage signals. The OPA131UA combines low input bias current with general-purpose dynamic performance. Its 4 MHz gain-bandwidth product supports useful bandwidth at moderate closed-loop gains, while the 10 V/µs slew rate supports faster large-signal transitions. Maximum input offset voltage is 750 µV, helping reduce static error in gain and feedback networks when precision matters. The device operates from a wide ±18 V supply range, which provides flexibility in dual-supply instrumentation and higher-headroom single-supply systems when biasing is arranged correctly. Its FET input stage is the defining architectural feature: the 50 pA maximum bias current helps prevent source-loading errors in high-impedance sources and reduces input-current-induced voltage shifts. Typical applications include precision signal conditioning, low-current sensor interfaces, analog measurement systems, audio preamplification, active filtering, and general-purpose analog signal chains. It is especially useful where conventional bipolar-input amplifiers may produce excessive input bias-current error but full rail-to-rail operation is not required. Designers should verify input and output common-mode limits, supply polarity, output swing, and stability against the intended load before finalizing a circuit. Feedback-component placement and output-load configuration also require care because the 8-pin SOIC device must be supported by a stable compensation network and suitable board layout. This product page combines manufacturer specifications, drop-in comparison guidance, application-oriented design notes, and practical considerations for engineers evaluating the OPA131UA in general-purpose analog designs.

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OPA132U - 8MHz FET-Input Op Amp, Single, 8-SOIC | Texas Instruments
OPA132U

OPA132U - 8MHz FET-Input Op Amp, Single, 8-SOIC | Texas Instruments

The Texas Instruments OPA132U is a single-channel, high-speed FET-input operational amplifier in an 8-pin SOIC package, providing 8 MHz of bandwidth, 20 V/µs slew rate, and 5 pA maximum input bias current. It operates from ±2.25 V to ±18 V dual supplies (or 4.5 V to 36 V single supply) and is specified over the -40 °C to +85 °C industrial temperature range. An operational amplifier (op amp) is a high-gain differential voltage amplifier that uses external feedback components to set closed-loop behavior such as gain, filtering, and signal conditioning. FET-input op amps use a junction field-effect transistor at the input stage rather than a bipolar transistor, delivering input bias currents orders of magnitude lower than their BJT counterparts. The OPA132 belongs to the SoundPlus audio op-amp family and sits in the broader hierarchy of linear ICs → amplifiers → operational amplifiers → precision audio op amps. Key features include a 130 dB open-loop gain (600 Ω load), 500 µV maximum offset voltage, 0.00008 % total harmonic distortion, and 5 pA maximum input bias current. The FET input stage enables direct interface to high-impedance sensors, photodiodes, and electret microphones without requiring bias-current compensation networks. Its 20 V/µs slew rate and 8 MHz gain-bandwidth product make it equally suitable for fast-settling data-acquisition front ends and low-noise audio signal paths. The OPA132 uses a complementary bipolar-FET input stage followed by a high-gain second stage and a class AB output, providing rail-swing to within ~1.5 V of either supply on 600 Ω loads. The architecture is unity-gain stable and includes internal ESD protection on all pins. Single, dual (OPA2132), and quad (OPA4132) versions share identical specifications for maximum design flexibility across channel counts. Typical applications include professional audio line drivers and headphone buffers, photodiode and pH-probe transimpedance amplifiers, high-impedance sensor signal conditioning, 16-bit and 18-bit ADC input buffers, and active filters for instrumentation. The 8-SOIC footprint and industry-standard pinout simplify PCB layout in both new designs and legacy upgrades. When designing with the OPA132U, place a 100 nF decoupling capacitor within 5 mm of each supply pin and use a ground plane to minimize parasitic inductance. For audio applications, keep input traces short and guarded to preserve the FET input's ultra-low bias current and avoid leakage paths on the PCB surface. This page synthesizes distributor pricing, drop-in SOIC-8 alternatives, and practical design notes not consolidated on the manufacturer datasheet, giving engineers a single reference for part selection, layout, and second-source decisions.

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OPA132UA - 8MHz FET-Input Audio Op Amp | Texas Instruments
OPA132UA

OPA132UA - 8MHz FET-Input Audio Op Amp | Texas Instruments

Texas Instruments OPA132UA is a single, high-performance FET-input operational amplifier with 8 MHz gain-bandwidth product, 20 V/µs slew rate, and input bias current of 5 pA in an 8-pin SOIC package. Designed for audio, data-acquisition, communications, and general-purpose analog signal chains, it combines high speed with low input current for applications involving high source impedance. An operational amplifier is a voltage-controlled differential amplifier used to amplify, buffer, filter, or condition analog signals. The OPA132 belongs to the operational-amplifier hierarchy within analog and mixed-signal ICs, while its FET-input architecture makes it especially useful where source impedance is high and input bias current must remain low. The single-channel configuration also permits flexible allocation of amplifier, comparator, and analog-processing resources across a board. Key features include an 8 MHz bandwidth, 20 V/µs slew rate, maximum input bias current of 5 pA, maximum offset voltage of 500 µV, and low distortion of 0.00008%. According to the manufacturer datasheet, the OPA132 family also provides an open-loop gain of 130 dB with a 600 Ω load and a wide supply range extending to ±18 V. These characteristics make the device useful where accurate small-signal reproduction and rapid large-signal transitions must coexist. The combination of wide bandwidth and high slew rate produces short settling behavior, while the FET input stage minimizes current drawn from high-impedance sources. The 50 pA maximum input bias current is particularly important when the source is a sensor, transducer, photodiode, or other high-output-resistance element. The 500 µV maximum offset voltage supports precision amplification, although actual accuracy still depends on feedback resistors, source impedance, and circuit-noise conditions. Typical uses include high-fidelity audio channels, active crossover networks, instrumentation preamplifiers, communications interfaces, analog filters, and data-acquisition front ends. In audio equipment, the combination of 8 MHz bandwidth, 20 V/µs slew rate, and low distortion supports low-distortion signal processing. In sensor interfaces, the 5 pA nominal bias current helps avoid loading of high-impedance sources. The primary design consideration is supply-headroom management. Although the family supports a wide supply range up to ±18 V, the amplifier still requires adequate voltage at its pins to maintain output swing and avoid distortion. Decoupling capacitors should be placed close to the supply pins, and feedback-component values should be checked against the amplifier's noise, bias-current, and stability behavior before production use. This product page consolidates manufacturer specifications, distributor availability references, same-footprint alternatives, and application-focused design guidance. It also distinguishes verified drop-in information from parameters that still require direct comparison against the current manufacturer datasheet and the specific finished design.

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OPA134PA - 8MHz FET Audio Op Amp | Texas Instruments
OPA134PA

OPA134PA - 8MHz FET Audio Op Amp | Texas Instruments

Texas Instruments OPA134PA is a single, high-performance audio operational amplifier with a true FET input stage, 8 MHz gain-bandwidth product, 50 pA input bias current, and an 8-pin PDIP package. Designed for low-noise and low-distortion signal chains, it combines an 8 nV/√Hz noise density, 0.00008% distortion, 20 V/µs slew rate, and an open-loop gain of 600. These characteristics make the OPA134PA suitable for audio preamplification, active filtering, line and headphone-driver signal conditioning, and other low-level analog stages where the input device and output drive can materially affect sound quality. An operational amplifier is a high-gain differential amplifier used in feedback configurations to amplify or process analog signals. The OPA134PA belongs to the SoundPlus family of audio operational amplifiers, a category optimized for low distortion, low noise, wide bandwidth, and strong output-drive capability. Its FET-input architecture replaces the input-bias current characteristic commonly associated with bipolar transistor input stages. In practical audio systems, this helps reduce source-dependent distortion and allows the amplifier to work effectively with high-impedance sensors, transducers, and low-level pickup stages. The OPA134PA provides 8 MHz gain-bandwidth product and 20 V/µs slew rate, supporting accurate reproduction of rapidly changing audio waveforms without requiring a bipolar input device. Its 8 nV/√Hz noise density is valuable when the op amp follows a low-level source, because the amplifier adds less noise to the signal being amplified. The manufacturer identifies the device as a true FET-input amplifier, while the distributed specifications indicate an input bias current of 50 pA, supporting low-level and high-impedance applications where bias-current-induced errors would otherwise become significant. Audio performance is the central technical advantage. The specified distortion of 0.00008% is exceptionally low for a general-purpose audio preamplifier, while the high open-loop gain of 600 provides useful gain-bandwidth and precision characteristics in closed-loop amplifier networks. Wide supply operation extending to ±18 V gives designers room to use conventional dual-rail audio supplies and to build higher-amplitude stages around the amplifier. The 8-pin PDIP package also supports conventional through-hole assembly rather than requiring a fine-pitch surface-mount process. Typical uses include stereo and mono audio preamplifiers, active low-pass and high-pass filters, microphone and instrumentation preamplifiers, line-level buffers, and headphone-amplifier signal paths. In a feedback stage, the closed-loop gain is established primarily by external resistors, while the op amp must remain stable with the selected feedback network and load. For driving long or highly capacitive cables, source impedance, output-current demand, and stability should be checked before the circuit is finalized. A critical layout practice is to keep the input and feedback components close to the associated pins. Short feedback-loop traces reduce parasitic feedback and help preserve phase margin. Power-supply bypassing should be placed at the device pins, and unused supply pins must follow the manufacturer’s connection guidance. Output loads should remain within the device’s rated operating conditions, particularly when driving transformers, long cables, or capacitive stages. This page combines the manufacturer’s device description with searchable OPA134PA pinout, datasheet, and PDF queries, practical audio-circuit guidance, lifecycle information, and a parameter-by-parameter framework for evaluating replacement choices. It also distinguishes confirmed drop-in replacements from functional substitutes so engineers can preserve the original 8-pin PDIP footprint before committing a redesign.

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OPA134UA - 8MHz FET Audio Op Amp | Texas Instruments
OPA134UA

OPA134UA - 8MHz FET Audio Op Amp | Texas Instruments

Texas Instruments OPA134UA is a single, high-performance SoundPlus audio operational amplifier with an 8 MHz gain-bandwidth product, true FET input stage, 20 V/us slew rate, 8 nV/Hz noise density, and an 8-pin SOIC package. According to the Texas Instruments product page, the OPA134 is specified for low-distortion audio applications and combines a 50 pA input bias current with a wide ±18 V supply range. An operational amplifier is an analog signal-conditioning semiconductor that compares two input voltages and drives its output to amplify the difference between them. The OPA134 belongs to the SoundPlus high-performance audio operational-amplifier family, where low noise, low distortion, wide bandwidth, and high output drive are more important than the very low cost or minimal power of general-purpose precision amplifiers. The OPA134UA uses a true FET-input architecture, with the manufacturer listing input bias current at 50 pA and noise density at 8 nV/Hz. Its 8 MHz gain-bandwidth product supports wide-band signal paths, while the 20 V/us slew rate improves large-signal behavior. The family is fully specified for audio applications and is available in single, dual, and quad configurations. The UA ordering code places this single amplifier in an 8-pin SOIC package. The OPA134 series is designed for audio equipment where low distortion is critical to signal quality. The manufacturer identifies 0.00008% ultra-low distortion as a family feature. A true FET input stage supports low-bias operation, while the combination of wide bandwidth, high slew rate, and strong DC performance is intended to preserve signal fidelity across demanding audio paths. Typical uses include high-end audio preamplifiers, line-level stages, active crossover networks, headphone-driver signal chains, mixer blocks, and instrumentation requiring low-noise voltage amplification. Its wide ±18 V power-supply capability makes it suitable for professional and consumer audio systems that operate from conventional dual-supply rails. Headphone-buffer designs should still verify output-current and load requirements for the selected external circuit. For PCB implementation, place the bypass capacitors close to the supply pins and preserve the package pin arrangement defined in the manufacturer datasheet. Because no complete OPA134UA pin table appears in the product-page snippets, use the pin-description diagram in the manufacturer documentation before assigning amplifier inputs, output, and supply connections. This product record combines the manufacturer's defining electrical characteristics, package information, practical application guidance, and a focused comparison with related operational amplifiers. It also distinguishes verified drop-in candidates from options that require footprint and electrical review before substitution.

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OPA137P - 36V, 1MHz FET Op Amp | Texas Instruments
OPA137P

OPA137P - 36V, 1MHz FET Op Amp | Texas Instruments

Texas Instruments OPA137P is a single, low-cost, FET-input operational amplifier with a 36 V supply rating, 1 MHz gain-bandwidth product, and rail-to-rail input-to-positive-supply capability, housed in an 8-pin PDIP package. Its headline electrical values are 36 V maximum supply voltage, 1 MHz bandwidth, and 5 pA typical input bias current. The low-bias JFET input supports high-impedance sensing and measurement circuits, while the wide supply range accommodates industrial and bipolar-style signal chains. An operational amplifier is a voltage-gain building block that compares two input voltages and drives its output to represent their difference. The OPA137 belongs to the FET-input operational-amplifier family and combines low input current, low offset voltage, low quiescent current, and a moderate-speed, low-power design. This places it between general-purpose precision amplifiers and faster wideband amplifiers, making it suitable for analog signal conditioning rather than high-speed data conversion. Key features include approximately ±5 pA typical input bias current, 1.5 mV low offset voltage, operation to ±18 V supplies, 1 MHz bandwidth, and 120 μA per channel quiescent current in the series description. Rail-to-rail input extends the usable common-mode range toward the positive supply, improving dynamic range in single-supply systems. The manufacturer describes the OPA137 series as a low-cost FET-input MicroAmplifier family for miniature and cost-sensitive applications. The device uses a JFET-input architecture to achieve low input bias current while maintaining low power consumption. Its open-loop gain is listed as 145 dB in the manufacturer datasheet, while the 1 MHz bandwidth supports audio and general analog signal paths. The amplifier is intended for instrumentation, buffering, filtering, and precision analog interfaces where low input loading and moderate speed are more important than multi-gigahertz bandwidth. Typical uses include sensor-interface conditioning, low-level current measurement, audio preamplification, analog filtering, and precision signal buffering. In a current-to-voltage converter, the low input bias current minimizes error across a high-value feedback resistor. In an audio preamplifier, the 1 MHz bandwidth is suitable for voice-band and general audio stages when operated within the device's stated supply and stability limits. Designers should verify common-mode and output-swing limits for the actual supply voltage, provide stable feedback compensation, and account for input and output parasitics. Because the OPA137P is a single amplifier in an 8-pin PDIP, PCB layout must follow the exact manufacturer pinout rather than assuming the pin functions of the SOT-23-5 or MSOP-8 family variants. This page combines the verified Texas Instruments product information, distributor package and inventory references, and practical selection guidance. It also distinguishes confirmed family-level specifications from package-specific data and identifies replacement candidates only when the same-package pin compatibility and parametric match can be substantiated.

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OPA137U - 36V 1MHz JFET Op Amp | Texas Instruments
OPA137U

OPA137U - 36V 1MHz JFET Op Amp | Texas Instruments

The Texas Instruments OPA137U is a single JFET-input operational amplifier with a 36 V supply rating, 1 MHz gain-bandwidth product, and rail-to-rail input to the positive supply in an 8-pin SOIC package. It is designed for low-cost precision signal-conditioning applications that require low input bias current, low quiescent current, and operation from relatively wide supply voltages. The low-noise input architecture is particularly useful when the source impedance is high or the measured signal must not be materially distorted by input bias current. An operational amplifier is a voltage-feedback analog building block that amplifies the difference between two input voltages. The broader hierarchy runs from operational amplifier to voltage-feedback amplifier, analog signal-conditioning IC, and power-management and interface semiconductor. The OPA137 belongs to TI's MicroAmplifier family and uses a JFET-input stage, an architecture selected for very low input bias current while retaining a conventional voltage-feedback implementation. The verified manufacturer information identifies a supply rating up to 36 V, a 1 MHz gain-bandwidth product, input bias current of plus or minus 10 pA, quiescent current of 120 microamperes per channel, and open-loop gain of 145 dB. These characteristics make the amplifier suitable for current-to-voltage conversion, instrumentation, buffer stages, and low-frequency active filtering. The single amplifier architecture also allows systems to use one physical channel per analog signal. The OPA137 family emphasizes low-cost FET-input operation in miniature packages. Its 120 microampere quiescent current supports power-constrained instrumentation, while the approximately 10 pA input bias current reduces error when driving high-impedance sensors. The 1 MHz gain-bandwidth product places the device in the low-to-moderate bandwidth class, so it is better suited to precision and control loops than to high-speed video or communications paths. Typical uses include transimpedance amplifiers for photodiodes and pH-style sensors, voltage buffers for high-impedance dividers, analog sensor conditioning, low-frequency active filters, and precision current-feedback or measurement circuits. The 36 V rating also makes it useful in industrial systems where the signal may be referenced above conventional 12 V or 24 V rails, provided the total supply and input limits remain satisfied. Designers should verify input common-mode range, output swing, gain-bandwidth stability, and load capability directly in the manufacturer datasheet before finalizing a design. Decoupling should follow the datasheet's recommended layout, and high-impedance input nodes require careful board-level guarding and leakage control. The wide supply rating does not imply that every input and output voltage is valid for every supply configuration. This page combines verified manufacturer and distributor information with structured parameter coverage, drop-in comparison, application guidance, and practical design notes. The engineering information is intended to accelerate component selection while clearly identifying details that still require confirmation against the official datasheet.

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OPA145ID - 5.5MHz Low-Noise Precision JFET Op Amp | Texas Instruments
OPA145ID

OPA145ID - 5.5MHz Low-Noise Precision JFET Op Amp | Texas Instruments

The Texas Instruments OPA145ID is a single, 5.5 MHz, high-slew-rate, low-noise, low-power, precision JFET operational amplifier with rail-to-rail output swing, supplied in an 8-pin SOIC package. The OPA145ID is designed for precision signal conditioning where low offset voltage, low offset drift, low input bias current, and low noise are important. Its 5.5 MHz gain-bandwidth product and 20 V/us slew rate provide useful bandwidth for low-frequency precision applications while preserving a relatively low power consumption of 475 uA maximum. The amplifier uses JFET inputs to support picoampere-class input bias current and high-impedance sensor interfaces. Its rail-to-rail output swing allows operation from single-supply systems and provides direct interfacing to modern precision analog-to-digital converters. According to the Texas Instruments product page, the OPA145 family is intended for amplifying small signals from high-impedance sensors, while the OPAx145 family combines excellent drift, low current noise, and picoampere input bias current. The OPA145ID is the single-amplifier 8-SOIC ordering variant, with the D suffix identifying the SOIC package configuration. Its 20 V/us slew rate helps preserve large-signal response in instrumentation, sensor, and precision analog front-end designs. The low-noise JFET input stage is particularly useful when source resistance is high and input bias-current error would otherwise dominate measurement accuracy. The device is suited to battery-powered instrumentation, current measurement, bridge and sensor amplifiers, laboratory equipment, audio and communication signal chains, and precision data-conversion front ends. For layout, keep the input and feedback paths short, provide stable input and output bias-current paths, and follow the manufacturer’s recommended capacitor and grounding arrangements. This page combines the manufacturer’s OPA145 specifications with practical application guidance, package information, sourcing metadata, and drop-in alternatives for engineering evaluation.

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OPA1612AIDR - 1.1nV/√Hz Dual Audio Op Amp | Texas Instruments
OPA1612AIDR

OPA1612AIDR - 1.1nV/√Hz Dual Audio Op Amp | Texas Instruments

The Texas Instruments OPA1612AIDR is a dual-channel, bipolar-input audio operational amplifier with 1.1 nV/√Hz noise density, 0.000015% distortion at 1 kHz, and rail-to-rail output swing in an 8-pin SOIC package. The two amplifiers share a package but operate independently, making the device suitable for stereo audio signal paths, active filtering, line-level buffering, and precision analog front ends. What is a bipolar-input operational amplifier? A bipolar-input operational amplifier uses bipolar transistor input devices to provide low-voltage noise and precise analog signal handling. In the broader hierarchy, an operational amplifier is an analog IC, an amplifier IC, and part of a signal-conditioning or active-filter system. Audio applications require low noise, low total harmonic distortion, adequate output drive, and predictable behavior with capacitive and feedback networks. The verified data identifies the OPA1612 as a high-performance audio amplifier with 1.1 nV/√Hz noise density. The manufacturer datasheet states rail-to-rail output swing to within 600 mV with a 2 kΩ load and output drive capability of ±30 mA. Those figures help preserve dynamic range and allow the amplifier to drive downstream audio stages more effectively than a low-current precision op amp. The OPA1612AIDR is identified as an 8-SOIC, dual-circuit device. The bipolar input architecture is intended for low-noise audio signal conditioning rather than general-purpose low-power sensing. Its distortion specification of 0.000015% at 1 kHz is particularly relevant for headphone buffers, mixing-console stages, active crossovers, and studio signal paths. The rail-to-rail output characteristic improves usable swing near the supply limits, although input and output common-mode behavior must still be checked against the system rails. Typical applications include stereo line-input amplification, headphone-driver buffering, active low-pass and high-pass filters, microphone preamplifier stages, audio ADC drivers, and balanced audio signal-chain interfaces. The dual-channel configuration reduces the number of amplifiers required in a stereo design while keeping the two channels in one standard 8-SOIC footprint. The principal design consideration is to preserve low-noise performance with suitable bypassing, stable feedback compensation, and careful grounding. Keep input and feedback traces short, place decoupling capacitors close to the supply pins, and account for the amplifier’s ±30 mA output-drive capability when selecting the next stage. For a direct PCB substitution, confirm the exact package, pinout, supply range, and electrical limits against the replacement datasheet.

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OPA1642AIDR - Dual JFET Audio Op Amp | Texas Instruments
OPA1642AIDR

OPA1642AIDR - Dual JFET Audio Op Amp | Texas Instruments

The Texas Instruments OPA1642AIDR is a dual SoundPlus™ high-performance, JFET-input audio operational amplifier specified for high-end audio applications, supplied in an 8-pin SOIC (D) package on tape and reel. It delivers 5.1 nV/√Hz input voltage noise density, 0.00005% THD+N, and rail-to-rail output swing that increases headroom in low-voltage single-supply designs. Each channel integrates a precision JFET input stage, EMI/RFI-hardened inputs, and Unity-Gain Stable topology, providing the combination of low noise, low distortion, and high input impedance required by professional audio signal chains. A JFET-input operational amplifier is a type of analog amplifier whose input stage uses junction field-effect transistors instead of bipolar transistors, yielding extremely low input bias current and high input impedance while presenting a near-ideal voltage-follower load to preceding sources. The OPA1642 belongs to the broader hierarchy of audio operational amplifiers (audio op amp → operational amplifier → amplifier IC → integrated circuit → semiconductor), and within that taxonomy it sits in the high-performance sub-class defined by sub-1 µVrms noise floors and harmonic distortion below 0.001%. Because audio signal quality is dominated by the op amp's intrinsic noise and linearity, parts like the OPA1642 directly set the achievable dynamic range and channel separation of line-level stages, headphone amplifiers, ADC input buffers, and DAC I/V converters. The OPA1642AIDR combines 5.1 nV/√Hz noise density, 0.00005% THD+N, ±2.5 mV typical input offset voltage, and a 2 pA typical input bias current. The 8-SOIC variant specified here runs over a -40 °C to +85 °C commercial temperature range and operates from ±2.25 V to ±18 V dual supplies or 4.5 V to 36 V single supply. Internal EMI/RFI filters on the input pins suppress conducted and radiated interference that otherwise leaks into the audio band from nearby switching converters or wireless modules. The output swings within ~600 mV of either rail at 2 kΩ load, giving the designer extra usable dynamic range in 5 V and 6 V single-supply audio paths. The JFET front end eliminates the input-bias current errors that plague bipolar audio op amps, while the bipolar output stage delivers the high slew rate and clean large-signal response required by professional-grade equipment. Designers should still observe the datasheet's input common-mode range, output swing, and decoupling recommendations; this configuration provides single-channel noise below 1 µVrms and channel separation exceeding the limits of typical board layouts. Typical applications include high-fidelity preamplifier stages, professional mixing-console line inputs, headphone amplifiers, active crossover filters, studio microphone preamps, and DAC I/V conversion networks. Compared to general-purpose op amps such as the TL072, the OPA1642AIDR offers an order-of-magnitude lower noise and lower distortion, making it a clear upgrade where source-impedance is moderate. This page synthesizes distributor pricing, drop-in alternative guidance, and practical design notes that complement the manufacturer datasheet.

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OPA1688 - 36V 10MHz Low Noise Audio Op Amp | TI
OPA1688ID

OPA1688 - 36V 10MHz Low Noise Audio Op Amp | TI

The Texas Instruments OPA1688ID is a 36-V, single-supply, low-noise SoundPlus audio operational amplifier operating on supplies from 4.5 V (±2.25 V) to 36 V (±18 V), with 10-MHz bandwidth, rail-to-rail output, and low distortion. It is offered in SOIC-8 and WSON-8 packages. An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output, fundamental to analog signal conditioning, filtering, and amplification. The OPA1688 belongs to the SoundPlus family of audio op amps, optimized for low noise, low distortion, and high output drive within the broader linear amplifier category used across audio, instrumentation, and communication systems. Key features include 4.5 nV/√Hz input voltage noise, an 8 V/µs slew rate, and low quiescent current of 1.5 mA per channel. Excellent capacitive load stability allows direct drive of up to 1000 pF without oscillation, and ±75 mA output current enables direct headphone drive. The rail-to-rail output (RRO) stage maximizes dynamic range in single-supply designs. Technically, the OPA1688 uses a complementary bipolar input stage with laser-trimmed input offset voltage of 0.5 mV (typical). The wide supply range supports both battery-powered and industrial systems, and the -40C to +85C operating range ensures reliability in demanding environments. THD+N of 0.00005% at 1 kHz and high PSRR preserve signal fidelity in high-fidelity audio paths. Typical applications include headphone amplifiers, audio DAC output buffers, active filters, and professional audio mixing consoles. High output current and capacitive load stability make it especially suited to direct headphone drive, while low noise and distortion preserve audio integrity in portable devices where 1.5 mA quiescent current extends battery life. Design tip: decouple supply pins with 0.1 µF ceramic capacitors placed close to the device, keep feedback paths short to minimize parasitic capacitance, and use an isolation resistor for capacitive loads beyond 1000 pF. Pricing references are as of 2026-08-30.

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OPA170AIDBVT - 36V, 1.2MHz, Low-Power Op Amp | Texas Instruments
OPA170AIDBVT

OPA170AIDBVT - 36V, 1.2MHz, Low-Power Op Amp | Texas Instruments

The Texas Instruments OPA170AIDBVT is a single-channel, 36-V, 1.2-MHz, low-power operational amplifier (op amp) in a 5-pin SOT-23 (DBV) package, offering rail-to-rail output swing and excellent DC precision for cost-sensitive general-purpose applications. According to the manufacturer datasheet, the device operates on supplies from 2.7 V (±1.35 V) to 36 V (±18 V), supports 1.2 MHz unity-gain bandwidth, and delivers low offset voltage with low quiescent current. What is a low-power operational amplifier? A low-power op amp is a class of analog amplifier IC designed to operate on single or dual supplies while consuming minimal quiescent current, enabling battery-powered and energy-efficient designs. Low-power op amps sit within the broader operational amplifier family, which belongs to linear ICs and the signal-conditioning product hierarchy. They balance bandwidth, offset, and noise against supply current, making them ideal for always-on sensor interfaces and portable instrumentation. Key features include rail-to-rail output (RRO), an enable/shutdown pin for power sequencing, low offset voltage, low drift over temperature, and 1.2 MHz gain-bandwidth product. The device also provides ESD protection on the inputs/outputs and is specified over the -40 °C to +125 °C industrial temperature range. The 5-pin SOT-23 footprint enables extremely compact PCB designs for space-constrained analog front ends. Architecturally, the OPA170 uses a bipolar input stage with CMOS output stages for rail-to-rail swing, and the family (OPA170/OPA2170/OPA4170) shares identical specifications across single, dual, and quad versions for easy design portability. The combination of 36 V tolerance, low quiescent current, and small packaging positions the OPA170 as a strong fit for industrial sensors, transducer signal conditioning, and active filtering. Typical applications include current sensing in power management, transducer amplifiers for pressure/flow sensors, active filters, test equipment input buffers, and general-purpose signal conditioning for industrial control and battery-powered systems. Designers choose the OPA170 family when they need robust 36 V tolerance, low power, and rail-to-rail output in a tiny footprint. When designing with this device, place a 0.1 µF decoupling capacitor as close as possible to the power-supply pin and ensure input common-mode range is respected. The shutdown/enable pin allows direct power-rail control in low-power duty-cycled applications. This page synthesizes verified distributor pricing, parametric drop-in alternatives, and practical design guidance not found in the manufacturer datasheet, all anchored to the official TI OPA170 datasheet as of 2026-10-09.

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OPA171AIDRLT - 36V 3MHz Single Op Amp | Texas Instruments
OPA171AIDRLT

OPA171AIDRLT - 36V 3MHz Single Op Amp | Texas Instruments

The Texas Instruments OPA171AIDRLT is a single-channel, 36V, 3MHz, low-power operational amplifier (op amp) in a 5-pin SOT-553 (DRL) micropackage with rail-to-rail output (RRO). It is part of the OPAx171 family, which shares identical AC and DC specifications across single, dual, and quad versions for maximum design flexibility. The device operates from a single supply of 2.7V to 36V (or dual ±1.35V to ±18V), drawing only 475 µA of quiescent current per channel while delivering 3 MHz of gain-bandwidth product and 1.5 V/µs slew rate. An operational amplifier (op amp) is a high-gain DC-coupled electronic voltage amplifier with differential inputs and a single-ended output, used as a foundational building block in analog signal chains. Op amps sit inside the broader hierarchy of linear integrated circuits (ICs) -> amplifiers -> operational amplifiers, and are commonly classified by supply range, bandwidth, power, and noise. The OPA171 is targeted at low-power, single-supply general-purpose applications where a wide supply range (up to 36V) and rail-to-rail output swing are required - it is NOT a precision or low-noise audio op amp, but rather a general-purpose workhorse for industrial and consumer designs. Key features of the OPA171AIDRLT include 3 MHz GBW, 1.5 V/µs slew rate, 475 µA quiescent current, 36 V supply tolerance, rail-to-rail output swing, ±2 mV typical input offset voltage, and internal RF/EMI filtering on the inputs. The SOT-553 (DRL) package is a low-profile (~0.5 mm) surface-mount micropackage suitable for space-constrained PCB designs. The OPAx171 family delivers low offset, low drift, low quiescent current, and 3 MHz bandwidth simultaneously - a combination rare in this supply-voltage class. Architecturally, the OPA171 uses a CMOS input stage that allows true rail-to-rail input common-mode range (no input phase reversal), paired with a class AB output stage capable of rail-to-rail swing. Internal EMI/RFI rejection filters on the input pins suppress high-frequency interference, simplifying compliance in industrial environments. The device is also specified over the -40°C to +125°C automotive and industrial temperature range. Typical applications include building automation sensor conditioning, battery-powered industrial transmitters, low-side current sensing, active filters, transducer drivers, and general-purpose signal buffering in 4-20 mA loops, PLC analog input modules, and portable instrumentation. The wide supply range (2.7V-36V) makes it well-suited to 5V USB-powered systems and 24V industrial bus rails from the same part. When designing with this op amp, observe that the input common-mode range extends to both rails but the input offset voltage degrades near the rails (CMOS input stage). Output is rail-to-rail but the output swing spec is typically within 50 mV of either rail at light loads. Decouple the supply pin with at least 0.1 µF X7R ceramic placed within 5 mm of the pin to ensure stability and PSRR performance. This page synthesizes DigiKey/Mouser distributor pricing, drop-in SOT-553 alternatives, and PCB design notes not aggregated on the manufacturer's product page.

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