OPA635U - 100MHz High-Speed Amplifier | Texas Instruments
N.º de pieza: OPA635U ✗ Fin de vida| Cant. | Precio unitario | Total |
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| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
OPA635U Descripción general
A high-speed operational amplifier is a voltage-feedback amplifier designed to amplify rapidly changing signals while maintaining useful gain, bandwidth, slew rate, and signal integrity. Within the broader hierarchy, an operational amplifier is an analog IC, and the OPA635U belongs to the high-speed voltage-feedback amplifier family. Its SpeedPlus architecture targets circuits requiring wide bandwidth and fast large-signal response without relying on a complex external compensation network.
Key features include bandwidth extending to 100 MHz under the stated gain condition, 250 V/us slew rate, and 5.6 nV/sqrt(Hz) low input-voltage noise. The device supports operation to +10 V, can drive 80 mA, and can be placed in a shutdown state when the OPA635 version's power-disable function is used. Its input range extends to ground, making it relevant to single-supply systems that process signals near 0 V.
The combination of high bandwidth and slew rate is useful in video and test equipment, high-speed filters, communications interfaces, active impedance conversion, and instrumentation buffers. Low input noise is especially relevant when amplifying small signals, while the 80 mA output-current capability provides drive for downstream stages and termination networks. Actual gain bandwidth, stability, and output swing depend on the selected gain, supply voltage, load, and feedback network.
For +5 V operation, the verified data identifies a 4.8 V output swing, which leaves less headroom than the full supply rail and should be considered when designing receiver or driver interfaces. The 250 V/us slew rate supports fast transitions, but board parasitics, capacitive loading, and feedback-loop stability remain critical at high frequency. The SOIC package helps preserve the amplifier's high-frequency behavior compared with larger parasitic packages.
A practical design should use short, controlled-impedance traces, a small, symmetric feedback network, and decoupling close to the supply pins. If the application does not need shutdown, the disable function should be tied to its inactive level according to the manufacturer datasheet. Confirm stability and output swing on the completed PCB because high-speed amplifier performance is sensitive to loading, grounding, and component placement.
This page consolidates the verified OPA635U features, source links, package information, design cautions, and replacement-status assessment. It is intended to help engineers locate the datasheet, understand the core electrical limits, and plan a replacement without assuming that merely similar amplifier specifications guarantee drop-in compatibility.
Alternativas directas para OPA635U — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con OPA635U (mismo factor de forma y huella) — difiere en Amplifier Type, Package.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
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Solicitar alternativasOPA635U Valores máximos y características eléctricas
| Amplifier Type | Single voltage-feedback operational amplifier |
| Number of Circuits | 1 circuit |
| Gain-Bandwidth Product | 100 MHz |
| Slew Rate | 250 V/us |
| Input Voltage Noise | 5.6 nV/sqrt(Hz) |
| Maximum Supply Voltage | +10 V |
| Output Swing on +5 V Supply | 4.8 V |
| Output Current | 80 mA |
| Input Range | Includes ground |
| Power Disable | Yes, OPA635 version |
| Encapsulado | 8-pin SOIC |
| Tipo de montaje | Surface mount |
| Temperature Grade | Industrial |
| Terminal Form | Gull wing |
| Number of Terminals | 8 |
| Tipo de salida | Voltage feedback amplifier |
Guía de configuración de pines de OPA635U 8-pin soic
Configuración de pines para OPA635U (encapsulado 8-pin soic). Este componente analógico presenta pines de entrada, salida y alimentación. Consulte la hoja de datos del fabricante para conocer las configuraciones de los pines de ajuste de offset, compensación y habilitación. Ideal para circuitos de acondicionamiento de señal y amplificadores.
No hay datos detallados de patillaje disponibles para OPA635U.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
OPA635U es adecuado para 7 aplicacións: High-Speed Video Signal Conditioning, Communications Receiver Front End, Precision Instrumentation Buffer, Active Filter and Equalizer, Test and Measurement Amplifier, Single-Supply Analog Interface, Portable and Battery-Powered Signal Paths.
High-Speed Video Signal Conditioning
The OPA635U fits video-signal conditioning because the verified 100 MHz gain-bandwidth product and 250 V/us slew rate provide the basic speed needed for wideband voltage amplification. It can be used as a gain stage, buffer, or active-filter element when the selected closed-loop gain preserves stability. The 4.8 V output swing from a +5 V supply should be checked against the video interface levels. Short traces, matched feedback resistors, and controlled loading are essential because PCB capacitance can change the effective bandwidth and ringing.
Recomendado
Communications Receiver Front End
The OPA635U can serve in a communications receiver when the design requires a high-speed, low-noise voltage-feedback amplifier rather than a general-purpose precision op amp. Its 5.6 nV/sqrt(Hz) input-voltage noise is useful for weak received signals, while 100 MHz bandwidth and 250 V/us slew rate help preserve fast transitions. The amplifier still requires a valid input common-mode range, adequate supply headroom, and a feedback network that remains stable at the intended gain. Cable and board capacitance should be treated as part of the signal path.
Recomendado
Precision Instrumentation Buffer
OPA635U is applicable to instrumentation buffers that need more bandwidth and slew rate than a conventional precision amplifier, especially when sensor outputs change quickly. Its low input voltage noise helps preserve small signals, while the 80 mA output-current capability provides drive for subsequent analog stages. Instrumentation use still demands attention to offset, bias current, common-mode range, stability, and resistor noise, which are not fully specified in the supplied verified snippets. A unity-gain or inverting configuration should be checked against the manufacturer datasheet before layout release.
Recomendado
Active Filter and Equalizer
The OPA635U can implement wideband active filters or equalizer stages because its 100 MHz bandwidth and 250 V/us slew rate support fast signal movement. The ground-inclusive input range is useful in single-supply analog circuits, although the output swing of 4.8 V on +5 V must remain within the signal-chain limits. Component tolerances, feedback-ratio stability, and the amplifier's interaction with capacitive loads can materially alter filter response. Simulate the complete network and verify it with a prototype using controlled-impedance routing and adequate decoupling.
Recomendado
Test and Measurement Amplifier
OPA635U is useful in test equipment when a sensor or source requires a wideband amplifier with faster response than a conventional precision op amp. The 5.6 nV/sqrt(Hz) input noise and 100 MHz bandwidth provide useful starting performance for small-signal measurement paths, while shutdown can help control power in repeated test cycles. Measurement accuracy still depends on offset, drift, bias current, common-mode range, and resistor selection, none of which can be inferred from the supplied snippets. Use short guarded traces and verify calibration behavior over temperature.
Recomendado
Single-Supply Analog Interface
The OPA635U is appropriate for single-supply interface designs whose signals operate near ground because the verified input range includes ground. It can buffer or amplify low-side analog signals while operating from a supply as high as +10 V, subject to the exact common-mode and output limits in the datasheet. The 4.8 V swing on a +5 V supply leaves margin limitations for logic thresholds, so level-shift or rail-to-rail devices may be preferable in some interfaces. Decoupling and return-current layout should be selected for the operating bandwidth.
Recomendado
Portable and Battery-Powered Signal Paths
OPA635U can be considered for portable signal paths when the OPA635 shutdown function helps reduce power during inactive intervals. The 250 V/us slew rate supports fast transient handling, and the 80 mA output capability can drive a moderate downstream load, but battery designs must account for supply-current behavior and output-swing limits at low voltage. The verified data does not provide a complete current-consumption curve or battery-voltage range, so those values must be checked in the datasheet. Battery operation should also be evaluated for noise, startup behavior, and thermal rise.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para OPA635U — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto |
|---|---|
| Package | 8-pin SOIC |
| Brand | Texas Instruments |
| Gain-Bandwidth Product | 100 MHz |
| Slew Rate | 250 V/us |
| Input Voltage Noise | 5.6 nV/sqrt(Hz) |
| Maximum Supply Voltage | +10 V |
| Output Swing on +5 V Supply | 4.8 V |
| Output Current | 80 mA |
| Input Range | Includes ground |
| Shutdown Function | Yes, OPA635 version |
Diferenciadores clave
- High-speed signal conditioning in a compact SOIC (frente a OPA633)
- Shutdown support in the OPA635 version (frente a Generic high-speed op amp)
- Ground-inclusive single-supply input operation (frente a Rail-to-rail-input amplifier)
Notas de diseño
Use short, controlled-impedance traces for the input, output, feedback, and supply connections. Place the feedback network close to the OPA635U and use resistor values that preserve the intended closed-loop gain and stability. At high frequency, even a small parasitic capacitance at a feedback node or output can introduce peaking, ringing, or oscillation. Prototype with the intended load, connector, and grounding arrangement.
Place supply-decoupling capacitors immediately adjacent to the amplifier's supply pins and provide a low-impedance return path. The verified data emphasizes high-bandwidth operation and ground-inclusive input range, but those specifications do not remove the need for clean supply distribution. Keep analog signal routing away from noisy switching nodes and high-current return paths. Validate the PCB with a high-impedance probe or suitable test equipment because package and fixture capacitance can alter the result.
Do not treat the 4.8 V output swing on a +5 V supply as a full-rail-to-rail capability, and do not assume that every input near ground is acceptable without checking the complete common-mode range. The shutdown pin must be driven to a defined state even when shutdown is unused. Also avoid selecting a replacement based only on 100 MHz bandwidth; confirm supply range, pinout, output swing, stability, and disable behavior.
Información de cumplimiento
The verified search results do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. The component is an industrial-grade 8-pin SOIC according to the Partstack listing, but that does not establish AEC-Q100 qualification.