OPA549T - High-Voltage 3A Power Op Amp | Texas Instruments
MPN: OPA549T ✓ ActiveOPA549T Overview
An operational amplifier is an active analog signal-conditioning device that uses negative feedback to amplify the difference between its input voltages. A high-voltage power operational amplifier extends this general-purpose category into applications requiring large output-voltage excursions and substantial output current. In the electronics hierarchy, the OPA549T is an operational amplifier, analog amplifier, power amplifier, and signal-conditioning IC. It differs from small-signal op amps through its wide supply range, high output-current capability, and thermally capable package.
Verified ordering information identifies the OPA549T as a single-amplifier device in the TO-220 (KV) package with an operating-temperature range of -40°C to 85°C. The specified supply range extends from 8 V to 60 V, while the listed gain-bandwidth product is 900 kHz and slew rate is 9 V/µs. These values make the part relevant to applications requiring broader voltage and current handling than conventional precision or low-noise op amps.
The OPA549T uses a high-voltage, high-current output stage designed for excellent output swing. Its combination of high supply voltage, 9 V/µs slew rate, and current capability is useful when driving resistive or reactive loads through external transistor stages. In such designs, the op amp provides high-voltage error amplification and drive voltage, while external power transistors provide the required load current. The TO-220 package also supports through-hole mounting and thermal management by providing a practical path for heat removal.
Typical application areas include high-voltage audio amplifiers, motor-drive control, power-supply control, laboratory test equipment, servo systems, and high-current analog signal chains. The device can serve as the error amplifier in a discrete power stage because its output can command high-voltage switching circuitry. Its 60 V maximum supply also provides useful headroom in industrial and laboratory systems, subject to proper thermal and transient protection.
Designers must account for power dissipation in both the amplifier and any external output transistors. A practical design should verify output swing into the actual load, maintain adequate input common-mode range, provide stable feedback compensation, and protect the output stage against shorts or inductive transients. The 900 kHz bandwidth means the closed-loop feedback network should be checked carefully to prevent unintended oscillation.
This page combines verified manufacturer and distributor information with application-focused engineering guidance, a pinout-availability warning, drop-in comparison candidates, and practical design considerations. It is intended to help engineers identify whether the OPA549T’s voltage, current, bandwidth, slew-rate, package, and thermal requirements fit a specific analog power-amplifier design.
Drop-in alternatives for OPA549T — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with OPA549T (same form factor and footprint) — differing in Gain-Bandwidth Product, Mounting Type, Package, Slew Rate, Supply Voltage Range.
OPA548T
✅ Drop-InContact for price
View Datasheet →OPA549T Maximum Ratings & Electrical Characteristics
| Product Type | High-voltage, high-current operational amplifier |
| Amplifier Count | 1 amplifier |
| Supply Voltage Range | 8 V to 60 V |
| Gain-Bandwidth Product | 900 kHz |
| Slew Rate | 9 V/µs |
| Output Swing | Excellent output swing |
| Package | TO-220 (KV), 11 pins |
| Mounting Type | Through-hole |
| Operating Temperature Range | -40°C to 85°C |
OPA549T to-220 (kv), 11 pins Pin Configuration Guide
Pin configuration for OPA549T (to-220 (kv), 11 pins package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for OPA549T.
Refer to the datasheet for full pin configuration.
Typical Applications
OPA549T is suitable for 6 applications: High-Power Audio Amplifier, Motor Drive Control, Laboratory Power-Supply Control, Servo and Position Control, High-Voltage Analog Signal Conditioning, Test and Measurement Amplifier.
High-Power Audio Amplifier
The OPA549T fits a high-voltage audio output stage because its verified supply capability extends to 60 V and its slew rate is 9 V/µs. It can operate as the error amplifier in a discrete power-amplifier topology, using external complementary transistors to deliver current to the loudspeaker while the OPA549T controls gain and linearity. The 900 kHz gain-bandwidth product must be compatible with the selected feedback network, and the amplifier should not directly drive a speaker unless its verified output-current and thermal limits are adequate. This approach separates voltage-command capability from external transistor current capability while retaining feedback around the complete power stage.
Recommended
Motor Drive Control
The OPA549T is suitable for high-voltage motor-control feedback loops when the control electronics operate from an 8 V to 60 V rail. Its 9 V/µs slew rate provides comparatively rapid voltage transitions, while the 900 kHz gain-bandwidth product supports control loops whose crossover frequency is safely below that value. The device can generate a command for external MOSFET or bipolar power stages rather than carrying motor current directly. Designers should include current sensing, shutdown behavior, overcurrent protection, and inductive transient suppression, then verify that the TO-220 thermal path can remove the amplifier’s own dissipation.
Recommended
Laboratory Power-Supply Control
The OPA549T can serve as the high-voltage error amplifier in a laboratory or industrial power-supply control circuit because it accepts supplies up to 60 V and offers excellent output swing. External power transistors can extend the available output current while the OPA549T maintains loop correction. Its 900 kHz bandwidth must be considered against the required loop crossover and compensation network, while the 9 V/µs slew rate helps drive large-scale control signals. Practical implementations need output-current limiting, startup sequencing, overvoltage and undervoltage protection, and thermal analysis based on the verified power dissipation.
Recommended
Servo and Position Control
The OPA549T fits servo and position-control systems that combine a low-level feedback signal with a high-voltage actuator command. The 8 V minimum and 60 V maximum supply range allow operation from elevated industrial control rails, while the 9 V/µs slew rate supports relatively quick command changes. The amplifier is normally paired with external output transistors rather than used as the only source of actuator current. The 900 kHz gain-bandwidth product requires a conservative loop crossover and stability analysis, and the design should include polarity protection, current limiting, and a defined shutdown path for actuator faults.
Recommended
High-Voltage Analog Signal Conditioning
The OPA549T is appropriate for conditioning signals in instrumentation where the internal operating voltage can approach 60 V and the required output excursion is substantial. Its excellent output swing, 900 kHz gain-bandwidth product, and 9 V/µs slew rate support wider-signal-band operation than a low-voltage precision op amp. The amplifier should still be evaluated for input common-mode range, offset, bias current, noise, and stability because those values were not available in the supplied verification text. Shield sensitive input routing and provide defined bias paths when processing high-impedance sensors.
Recommended
Test and Measurement Amplifier
The OPA549T can support high-voltage test and measurement equipment in which excitation or output swing exceeds the range of a conventional low-voltage op amp. Its 8 V to 60 V operating range, 900 kHz bandwidth, and 9 V/µs slew rate provide useful headroom for amplifier fixtures and programmable supply-control loops. The TO-220 (KV) package is mechanically suited to through-hole laboratory equipment, but its thermal dissipation must be checked under worst-case continuous output. Calibration, input protection, output clamping, and stable feedback compensation are required for accurate repeatable measurements.
Recommended
Recommended Products Summary
Engineering reference data for OPA549T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OPA548T |
|---|---|---|
| Package | TO-220 (KV), 11 pins | TO-220, 11 pins |
| Brand | Texas Instruments | Texas Instruments |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C |
Key Differentiators
- High-voltage operating capability (vs OPA548T)
- Defined slew-rate capability (vs OPA552UA)
- Power-stage error amplification (vs NE5534DR)
Design Notes
Treat power dissipation and the TO-220 thermal path as first-order design constraints. The verified operating range reaches 60 V, so even modest quiescent current can produce substantial heat at high supply voltage. Use the manufacturer’s verified junction-to-ambient thermal resistance, calculate worst-case dissipation at maximum supply, load, and temperature, and provide copper area or a heatsink appropriate to the resulting temperature rise. Do not use the unverified 0.00 pricing placeholders as commercial quotations.
Do not assume that a package-compatible amplifier is automatically pin-compatible. Before replacing the OPA549T with OPA548T, compare the official pin table, supply pins, feedback connections, shutdown or enable behavior, and exposed-tab connection. Confirm the maximum output current and output swing at the intended load because the supplied verification data states the feature qualitatively but does not provide a numerical current rating.
Keep feedback and compensation components close to the relevant amplifier pins, use a low-inductance return path for supply current, and place protection devices close to the external power stage. In a discrete output stage, separate the OPA549T’s signal-ground and high-current return paths to reduce output-stage transients from coupling into the feedback loop. Validate stability with the final transistor, load, supply, and compensation network rather than only the op amp in isolation.
Compliance Information
The supplied verified snippets do not explicitly extract environmental or regulatory declarations for OPA549T. The ETEI comparison result mentions RoHS and REACH in its scope, but it does not provide the actual values, so no compliance claim has been inferred.
