OPA551PA
OPA551PA - 60V High-Current Op Amp | Texas Instruments
The Texas Instruments OPA551PA is a high-voltage, high-current operational amplifier designed for applications requiring operation from a 60 V supply and substantial output drive current. The device provides a typical output current capability of 380 mA, a 15 V/µs slew rate, and a 3 MHz unity-gain bandwidth in an 8-pin PDIP package. It is unity-gain stable, making it suitable for buffer, driver, and audio output stages where the required gain is close to one.
An operational amplifier is an active analog device that amplifies the difference between two input voltages while providing high input impedance, low output impedance, and controlled gain and bandwidth. The OPA551PA belongs to the high-voltage power operational amplifier family, combining a 60 V maximum supply capability with current-drive capability that exceeds ordinary precision op amps. This makes it useful in telephone, audio, industrial control, and instrumentation systems where the load requires more current than a conventional small-signal amplifier can provide.
Key features include a wide 60 V supply range, typical output current of 380 mA, unity-gain stability, 3 MHz bandwidth, and a 15 V/µs slew rate. The amplifier is designed for a single-supply or dual-supply configuration, depending on the system requirements and the application circuit. Its high-current output stage makes it effective for driving capacitive loads, transformer inputs, audio transducers, and other loads that would overload a standard precision amplifier.
The OPA551PA uses a high-voltage, high-current internal architecture that is intended to maintain signal integrity while driving low-impedance loads. The 3 MHz bandwidth supports moderate-frequency signal paths rather than high-speed instrumentation or RF applications. Its 15 V/µs slew rate provides the output-current capability needed for larger-amplitude signals, while unity-gain stability allows direct voltage-follower use without compensation external components.
Typical applications include telephone line drivers, audio power amplifiers, headphone and transducer drivers, ultrasonic-driver circuits, industrial actuator interfaces, and high-voltage measurement systems. In audio applications, the amplifier can buffer a signal source and deliver current into a speaker or transformer load. In industrial systems, the 60 V capability supports higher-voltage signal chains while the 380 mA typical current capability handles demanding loads.
When designing around the OPA551PA, check the load current, output voltage swing, supply headroom, thermal dissipation, and stability requirements together. Place the decoupling capacitors close to the supply pins and keep the feedback path short to reduce oscillation risk. Confirm the maximum operating temperature, package tolerances, and output-current derating against the manufacturer datasheet before production release.
This page combines manufacturer specifications, package details, application guidance, and drop-in replacement information for engineers evaluating the OPA551PA in high-voltage amplifier and driver designs. It also provides practical comparison points for OPA551 family variants and compatible alternatives in the same 8-pin PDIP format.
견적 요청
문의하기