OPA544T - 4A High-Voltage Power Op Amp | Texas Instruments
MPN: OPA544T ✓ ActiveOPA544T Overview
An operational amplifier is an active analog signal-conditioning device that uses high open-loop gain to amplify the difference between its inverting and non-inverting inputs. The OPA544 belongs to the broader power-op-amp hierarchy within amplifier ICs, combining precision-style signal amplification with the output-current capability required to drive loudspeakers, motors, solenoids, and other high-current loads. The device is designed for applications where a conventional small-signal amplifier cannot supply enough output current.
Key features include a minimum high output current of 2 A, a typical high-current capability of 4 A, a wide ±35 V power-supply range, and an 8 V/µs slew rate. Internal current limiting protects the output stage during overload conditions, while thermal shutdown provides an additional protection mechanism. The 100 pA maximum input bias current is suitable for high-impedance sensing arrangements and reduces input-current-related errors. The copper tab and TO-220-5 package are intended for mounting to a heat sink rather than unrestricted PCB-only operation.
The OPA544T is designed around a wide supply range and a power output stage capable of delivering substantial current. Its exact output-current, thermal, and electrical limits must be checked against the manufacturer datasheet for the selected supply voltage, output waveform, duty cycle, and ambient temperature. The part is suitable for audio power stages, motor and actuator drivers, laboratory output stages, power conversion modules, and industrial control systems where the load requires a high-current amplifier.
Thermal design is central to using the OPA544T reliably. The device dissipates power as the difference between supply and output voltage is multiplied by output current, so load current, output swing, supply voltage, and ambient temperature determine the required heat-sink area. The TO-220 package should be mounted with its tab electrically and thermally connected to the heat sink according to the package and application guidance.
This page combines manufacturer specifications, distributor availability, verified sourcing information, same-family drop-in alternatives, and practical thermal and layout guidance for engineers evaluating the OPA544T.
Drop-in alternatives for OPA544T — 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 OPA544T (same form factor and footprint) — differing in Package.
OPA548T
✅ Drop-InContact for price
View Datasheet →OPA549T
✅ Drop-InContact for price
View Datasheet →OPA547T
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →OPA546T
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
OPA544U
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
OPA544T Maximum Ratings & Electrical Characteristics
| Device Type | Power operational amplifier |
| Typical Output Current | 4 A |
| Minimum High Output Current | 2 A |
| Power Supply Range | ±10 V to ±35 V |
| Maximum Supply Voltage | ±35 V |
| Slew Rate | 8 V/µs |
| Input Bias Current | 100 pA maximum |
| Output Protection | Internal current limiting |
| Thermal Protection | Thermal shutdown protection |
| Input Type | FET input |
| Package | 5-lead TO-220 plastic package |
| Lead Count | 5 leads |
| Mounting Type | Through-hole power package with copper tab |
| RoHS Status | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
OPA544T 5-lead to-220 plastic package Pin Configuration Guide
Pin configuration for OPA544T (5-lead to-220 plastic package 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 OPA544T.
Refer to the datasheet for full pin configuration.
Typical Applications
OPA544T is suitable for 6 applications: Loudspeaker and Audio Power Stage, DC Motor Driver, Solenoid and Valve Driver, Laboratory Power Output Stage, Power Conversion Reference Stage, Industrial High-Current Signal Buffer.
Loudspeaker and Audio Power Stage
The OPA544T suits audio power-output stages because the Texas Instruments device provides a typical 4 A output current, an 8 V/µs slew rate, internal current limiting, and thermal shutdown protection. It can drive a loudspeaker or line-driver load from positive and negative supply rails up to ±35 V, subject to the exact output-swing and thermal limits in the datasheet. Use the TO-220 copper tab as the thermal interface to a heat sink and keep the power-supply return path short. The amplifier’s high-current capability improves load drive versus a small-signal op amp, while the required heat-sink size depends on RMS output power, supply voltage, output swing, and duty cycle.
Recommended
DC Motor Driver
OPA544T can serve as a high-current motor-driver amplifier when the motor’s stall and inrush currents remain within the device’s protected operating limits. Its typical 4 A output current and 8 V/µs slew rate provide more drive capability than a conventional precision op amp, while the ±10 V to ±35 V supply range supports higher-voltage actuator systems. The circuit should include a properly sized heat sink, short high-current traces, and protection appropriate to the motor. Back-EMF from an inductive load requires suitable clamping or isolation because the datasheet protections are not a substitute for an external flyback path.
Recommended
Solenoid and Valve Driver
The OPA544T is a practical candidate for solenoid or valve drive because it can source and sink high current from ±10 V to ±35 V supplies and includes internal current limiting. An 8 V/µs slew rate allows the output to follow control-voltage transitions more effectively than many low-power amplifiers. Designers must still account for inductive kickback, saturation of the output stage, and continuous-duty thermal dissipation. A flyback diode or clamp arrangement should protect the amplifier, and the TO-220 tab should be attached to a heat sink sized for the actual coil duty cycle.
Recommended
Laboratory Power Output Stage
OPA544T can be used as the output stage of a laboratory amplifier when the test signal requires greater current or voltage swing than a conventional op amp can provide. Its typical 4 A output current and 8 V/µs slew rate are useful for driving resistive loads, current buffers, and controlled actuator fixtures. The supply rails may extend to ±35 V, but the output voltage, current, frequency, and waveform must remain inside the manufacturer’s limits. Thermal monitoring and a generously sized heat sink are recommended because continuous laboratory use can produce substantial dissipation even when the displayed waveform appears moderate.
Recommended
Power Conversion Reference Stage
OPA544T can provide error-amplifier or drive functions in selected power-conversion systems where the output must deliver substantial current rather than only sensing a small node voltage. Its ±10 V to ±35 V operating range and typical 4 A output capability make it relevant for driving power stages, while internal current limiting and thermal shutdown provide basic output-stage protection. The feedback network must be designed for the amplifier’s closed-loop behavior and output-current limits. A large thermal copper area or heat sink is usually necessary because the output-stage dissipation increases with voltage headroom and load current.
Recommended
Industrial High-Current Signal Buffer
OPA544T can act as a high-current buffer between a low-level control signal and a high-current industrial load when the required bandwidth and amplitude are compatible with its 8 V/µs slew rate. Its FET input, with 100 pA maximum bias current, helps reduce errors in high-impedance sensing arrangements, although the complete input common-mode and output-swing specifications must be checked in the datasheet. The device is most useful where several amps of peak current are needed in a compact package. Its TO-220 construction supports substantial heat removal, but mechanical mounting and isolation from high-current return paths remain essential.
Recommended
Recommended Products Summary
Engineering reference data for OPA544T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OPA548T | OPA549T | OPA547T | OPA546T | OPA544U |
|---|---|---|---|---|---|---|
| Package | TO-220-5 | TO-220-5 - same | TO-220-5 - same | TO-220-5 - same | TO-220-5 - same | TO-220-5 - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
Key Differentiators
- High typical output-current capability (vs OPA548T)
- Wide high-voltage supply capability (vs OPA549T)
- Fast output-voltage transition (vs OPA547T)
- Integrated output-stage safeguards (vs OPA546T)
Design Notes
Treat the OPA544T copper tab as the primary thermal path. Estimated dissipation should be calculated as P = (Vsupply - Voutput) × Ioutput for each load condition, using the actual output waveform and duty cycle rather than only the peak current. The resulting heat must be removed through the TO-220 tab, interface material, heat sink, and surrounding copper. Verify the manufacturer thermal limits before operating near maximum current, and avoid relying on internal thermal shutdown as normal heat-management practice.
Use the shortest practical traces for supply and output current, with copper areas sized for the intended 2 A minimum high-current condition and the higher transient capability specified for the device. Place input, feedback, and bypass connections away from the power-output path to reduce coupling. The verified source material does not provide a recommended land pattern or pin table, so the package drawing and manufacturer layout guidance in the datasheet must control the PCB design.
Do not confuse the typical 4 A output-current capability with permission to run 4 A continuously in any TO-220 footprint. Output current depends on supply voltage, output swing, waveform, duty cycle, ambient temperature, and heat-sink performance. Also avoid using a low-power op amp as a direct substitute in high-current paths, and do not omit flyback protection for inductive loads. Verify current limit, thermal shutdown, maximum supply voltage, and output swing in the manufacturer datasheet.
Compliance Information
The supplied manufacturer and distributor snippets do not provide explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals statements for OPA544T. AEC-Q100 is not applicable to this general-purpose power operational amplifier.
