OPA137U - 36V 1MHz JFET Op Amp | Texas Instruments
Teilenummer: OPA137U ✗ AbgekündigtOPA137U Übersicht
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.
Drop-in-Alternativen für OPA137U – 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 OPA137U (gleiche Bauform und Footprint) – abweichend in Amplifier Type, Package, Slew Rate.
OPA130UA
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
OPA132U
✅ Drop-InPreis auf Anfrage
Datenblatt ansehen →OPA137UE4
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
OPA137UG4
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
OPA137U/2K5
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
OPA137U Grenzwerte & elektrische Eigenschaften
| Amplifier Type | Single voltage-feedback operational amplifier |
| Input Architecture | JFET input |
| Maximum Supply Voltage | 36 V |
| Gain-Bandwidth Product | 1 MHz |
| Input Bias Current | ±10 pA |
| Ruhestrom | 120 µA per channel |
| Open-Loop Gain | 145 dB |
| Input Common-Mode Range | Rail-to-rail input to V+ |
| Slew Rate | 3.5 V/µs |
| Channel Count | 1 channel |
| Gehäuse | 8-pin SOIC |
| Montageart | Surface mount |
OPA137U 8-pin soic Pinbelegungsleitfaden
Pinbelegung für OPA137U (8-pin soic-Gehäuse). Dieses analoge Bauteil verfügt über Eingangs-, Ausgangs- und Versorgungspins. Offset-Null-, Kompensations- und Enable-Pin-Konfigurationen entnehmen Sie dem Herstellerdatenblatt. Ideal für Signalaufbereitung und Verstärkerschaltungen.
Keine detaillierten Pinbelegungsdaten verfügbar für OPA137U.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
OPA137U ist geeignet für 6 Anwendungs: Photodiode Transimpedance Amplification, Precision Industrial Sensor Conditioning, High-Impedance Voltage Buffering, Low-Frequency Active Filtering, Battery-Powered Portable Instrumentation, Precision Current Measurement.
Photodiode Transimpedance Amplification
OPA137U is well matched to photodiode and other high-impedance current-source measurements because its JFET input presents approximately ±10 pA of bias current. Placing the amplifier in a transimpedance topology converts sensor current into a measurable voltage while minimizing the input-current error that could obscure a weak signal. Its 1 MHz gain-bandwidth product supports moderate-bandwidth systems, but the feedback resistor and compensation capacitor must be selected together to achieve the required stability and bandwidth.
Empfohlen
Precision Industrial Sensor Conditioning
OPA137U can condition industrial sensor outputs when the source impedance is high and the supply voltage is above conventional low-voltage analog ranges. The 36 V maximum supply rating provides headroom for 24 V industrial systems, while approximately ±10 pA input bias current reduces errors from leakage-sensitive sensors. Its 120 µA per-channel quiescent current also supports distributed measurement systems where every amplifier contributes to overall power consumption.
Empfohlen
High-Impedance Voltage Buffering
OPA137U is useful as a voltage buffer between a high-impedance divider and a downstream measurement or conversion stage. Its JFET input reduces the bias-current-induced error that a bipolar input amplifier could create in this application, while the 145 dB open-loop gain supports accurate voltage following. The 1 MHz bandwidth is sufficient for slow analog signals but does not replace a dedicated high-speed buffer when rise-time requirements are strict.
Empfohlen
Low-Frequency Active Filtering
OPA137U can implement low-frequency active filters in precision measurement and audio-adjacent signal paths. Its 1 MHz gain-bandwidth product allows useful closed-loop bandwidth, and the low input bias current helps preserve high source impedances without introducing excessive DC error. Component tolerances, capacitor leakage, and the amplifier's finite open-loop gain and output drive should be evaluated together, particularly when very low cutoff frequencies require large resistance values.
Empfohlen
Battery-Powered Portable Instrumentation
OPA137U fits portable battery-powered instruments where low quiescent current is important but high precision remains necessary. The specified 120 µA per-channel quiescent current reduces the standing load from the amplifier itself, while the approximately ±10 pA input bias current helps preserve measurements taken from high-impedance sensors. Actual battery life still depends on the complete signal chain, load current, duty cycle, and regulator efficiency, so the amplifier rating should be treated as one part of the system budget.
Empfohlen
Precision Current Measurement
OPA137U is appropriate for precision current measurements where a voltage drop across a sense resistor must be amplified without excessive input-loading error. Its JFET input contributes approximately ±10 pA of bias current, helping preserve accuracy with high-impedance feedback networks. The 1 MHz bandwidth can accommodate many moderate-speed current signals, but system designers should confirm stability at the selected closed-loop gain and ensure the output remains within the device's allowable swing.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für OPA137U – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | OPA130UA | OPA132U | OPA137UE4 | OPA137UG4 | OPA137U/2K5 |
|---|---|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
Wichtigste Unterscheidungsmerkmale
- Very low JFET input bias current (vs. OPA130UA)
- Low power consumption for precision amplification (vs. OPA132U)
- Wide supply-voltage capability (vs. OPA137UE4)
- Documented low-noise-speed class (vs. OPA137UG4)
Designhinweise
Keep the amplifier input nodes short and isolated from switching nodes and high-impedance traces. For the OPA137U, input leakage and board contamination can become comparable to the specified ±10 pA bias current. Guard sensitive inputs where practical, remove residue from the PCB, and avoid placing long parallel copper runs beneath the input pins. Follow the manufacturer's recommended SOIC layout and place compensation components directly across their associated pins.
Do not infer safe operating behavior from the 36 V maximum supply rating alone. Confirm the minimum and maximum supply voltages, input common-mode range, output swing, and input absolute maximum ratings in the official datasheet. Decoupling should follow the manufacturer recommendation, and supply stability should be evaluated for applications using long wiring or high-impedance bias references. A wide supply capability does not guarantee operation with every input and output combination.
The 1 MHz gain-bandwidth product can be mistaken for guaranteed 1 MHz operation at every closed-loop gain. Noise gain, phase margin, load capacitance, feedback topology, and the selected compensation method affect stability and usable bandwidth. Verify the intended gain against the manufacturer stability and bandwidth graphs. For transimpedance designs, select the feedback resistor and compensation capacitor as a matched network rather than optimizing either component independently.
Compliance-Informationen
The supplied verified snippets do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is marked not applicable because OPA137U is presented as a general-purpose operational amplifier and no automotive qualification is stated.