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Texas Instruments OPA548FKTWT
- Part No.:
- OPA548FKTWT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
OPA548FKTWT.pdf
- Description:
- IC POWER 1 CIRCUIT DDPAK/TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,385
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Product details
Overview
OPA548FKTWT from Texas Instruments is a high-voltage, high-current operational amplifier designed for precision power amplification in demanding analog output stages. It delivers ±3-A continuous output current, supports ±4 V to ±30 V dual supplies (or 8–60 V single supply), and features adjustable current limiting (0–5 A), thermal shutdown with status reporting, and output disable control. It is used in semiconductor test equipment, ultrasound scanner driver stages, and programmable lab power supplies.
For engineers reviewing the OPA548FKTWT datasheet, OPA548FKTWT pinout, OPA548FKTWT application, or OPA548FKTWT equivalent, key selection criteria include its 10 V/µs slew rate, ±2-mV input offset voltage, 7-pin TO-220 staggered package with copper tab for heatsinking, and E/S pin dual-function enable/status capability.
Technical Context
The OPA548FKTWT uses a PNP-input stage with negative input bias currents and no bias compensation, requiring matched external resistances to minimize offset errors. Its high-current output stage employs temperature-compensated class A/B biasing to reduce crossover distortion while enabling stable operation into reactive loads when externally compensated.
Current limiting is implemented via indirect sensing at the ILIM pin using a low-level control signal (0–330 µA), eliminating series power resistors in the output path. The E/S pin provides both active output disable (reducing quiescent current to ±6 mA) and open-drain thermal shutdown status reporting - functions operable under single- or dual-supply configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | ±4 V to ±30 V dual or 8 V to 60 V single - enables flexible system integration across industrial and test equipment rails. |
| Output Current | ±3 A continuous, ±5 A peak - drives low-impedance loads like piezoelectric actuators, motor coils, and 4 Ω test fixtures without external parallel stages. |
| Slew Rate | 10 V/µs - supports fast transient response in closed-loop power supply and waveform generation applications up to ~100 kHz full-power bandwidth. |
| Input Offset Voltage | ±2 mV (typical) - ensures accurate DC-coupled gain accuracy in precision analog output modules and calibration sources. |
| Thermal Shutdown Threshold | 160°C junction temperature - protects against sustained overload or inadequate heatsinking; resets at 140°C. |
| Current Limit Range | 0 A to 5 A via ILIM pin - allows dynamic or fixed current limiting using resistor or DAC control, avoiding lossy sense-resistor dissipation. |
| E/S Pin Function | Dual-mode: logic-level disable input (≤0.8 V above V−) and thermal status output (3.5 V normal / 0.35 V shutdown) - simplifies fault monitoring and power sequencing. |
Pinout & Package
OPA548FKTWT is housed in a 7-lead TO-220 staggered-lead package (KVT variant) with exposed copper tab for direct heatsink mounting. Body size is 10.17 mm × 8.38 mm. Thermal resistance RθJA is 30.2°C/W, and RθJC(bot) is 0.2°C/W, enabling high-power dissipation with proper mechanical thermal design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN+ | Noninverting input | DC-coupled analog signal entry point; common-mode range extends below V− by 0.1 V for single-supply operation. |
| 2 VIN− | Inverting input | Feedback node; input bias current is negative (–100 nA typ), requiring matched source impedances to minimize offset. |
| 3 ILIM | Current limit set input | Accepts 0–330 µA control current to program output limit from 0 A to 5 A; open = 0 A, tied to V− = ~5 A. |
| 4 V− | Negative power supply | Reference rail for dual supply; supports operation down to –4 V; also serves as return for ILIM and E/S logic thresholds. |
| 5 V+ | Positive power supply | Reference rail for dual supply; supports operation up to +30 V; bypassing with 0.01 µF ceramic near pin is mandatory. |
| 6 VO | High-current output | Capable of ±3 A continuous into resistive loads; output swing is within 3.7 V of either rail at full load - requires heatsink for >1 W dissipation. |
| 7 E/S | Enable/Status bidirectional terminal | Input: pull ≤(V− + 0.8 V) to disable output (1 µs response); Output: sinks 5 µA during thermal shutdown (0.35–0.8 V). |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable current limit | 0–5 A set via external resistor or DAC on ILIM pin - eliminates power-wasting series sense resistors and enables programmable overcurrent protection. |
| Thermal shutdown with status reporting | Junction shutdown at 160°C; E/S pin outputs low voltage (0.35 V) during fault - enables real-time system-level thermal monitoring without additional sensors. |
| Output disable control | Reduces quiescent current from ±20 mA to ±6 mA when disabled - conserves power in multiplexed multi-channel systems operating <20 kHz. |
| Wide supply flexibility | Operates from ±4 V to ±30 V or 8–60 V single supply - supports asymmetric rails (e.g., +55 V / –5 V) for specialized test and actuation applications. |
| Heatsink-ready TO-220 package | Exposed copper tab with RθJC(bot) = 0.2°C/W - allows direct mounting to heatsinks or PCB copper planes for reliable thermal management at full output power. |
Applications
| Ultrasound Transducer Driver | Semiconductor Test Load |
|---|---|
|
Use Scenario: Driving capacitive piezoelectric transducers in medical ultrasound imaging systems with high-voltage, high-slew-rate burst waveforms. IC Role / Device Role / Timing Role: High-current, wide-swing output amplifier delivering ±20 V pulses at 1–10 MHz with precise amplitude control and current limiting. Use Value: Enables safe transducer excitation with programmable current limit preventing element damage, while thermal status reporting prevents overheating during extended scanning. |
Use Scenario: Providing calibrated current/voltage stimulus to DUTs during automated semiconductor wafer probing and functional testing. IC Role / Device Role / Timing Role: Precision programmable power source with independent voltage and current regulation, used in ATE front-end driver stages. Use Value: Delivers ±3 A at ±30 V with <0.02% THD+N, supporting accurate parametric measurement of power devices and analog ICs under stress conditions. |
| Programmable Lab Power Supply | Analog Input Module Actuator Interface |
|
Use Scenario: Serving as the regulated output stage in benchtop or rack-mounted programmable DC power supplies with remote sensing and protection. IC Role / Device Role / Timing Role: Final-stage power op-amp implementing voltage/current limiting loops, controlled via DACs for digital setpoint adjustment. Use Value: Integrates current limit, thermal shutdown, and output disable into one device - reducing BOM count and improving reliability versus discrete protection schemes. |
Use Scenario: Amplifying and buffering control signals to drive industrial actuators such as solenoid valves, proportional pressure regulators, and linear positioners. IC Role / Device Role / Timing Role: Robust output buffer providing high-current drive (±2.5 A) with rail-to-rail compatible swing and short-circuit protection. Use Value: Eliminates need for external current-sense resistors and discrete thermal cutoffs - simplifying PCB layout and improving long-term stability in harsh industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage, high-current operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA547FKTWT | Lower quiescent current (±12 mA vs ±20 mA), same package and pinout, but reduced output current (±1.5 A continuous). | Suitable for lower-power precision drivers where thermal budget is constrained but full 3-A capability is unnecessary. | Select OPA547FKTWT when power efficiency and smaller heatsink requirements outweigh peak current needs. |
| LM675T/NOPB | Wider input common-mode range (to V+), but only ±3.5 A peak (not continuous), no E/S pin, and no adjustable current limit - relies on external sensing. | Better for simple high-current buffers without programmable protection, especially where input stage rail-to-rail operation is critical. | Choose LM675T/NOPB for cost-sensitive, non-protected applications requiring minimal external components and no thermal status feedback. |
Compared with OPA548FKTWT, OPA547FKTWT trades 50% output current for lower idle power and identical footprint, while LM675T/NOPB offers simpler architecture but lacks integrated current limiting and thermal status - making OPA548FKTWT optimal for protected, programmable, high-reliability power amplification.
Availability
OPA548FKTWT is available at Aetrix Electronics and suitable for semiconductor test systems, ultrasound scanner subsystems, and programmable lab power supplies requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for OPA548FKTWT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, power management, and signal chain solutions.
The OPA548FKTWT belongs to TI's high-voltage, high-current operational amplifier product line, engineered for robust analog output stages in test, medical, and industrial instrumentation where reliability, protection, and thermal intelligence are critical.
FAQ
What is the maximum continuous output current specification for the OPA548FKTWT?
The OPA548FKTWT delivers ±3 A continuous output current into resistive loads at specified operating conditions. This rating assumes adequate heatsinking and ambient temperature ≤85°C. Peak current capability reaches ±5 A for short durations, but sustained operation above ±3 A requires careful thermal design and may trigger thermal shutdown if junction temperature exceeds 160°C. The OPA548FKTWT datasheet specifies this value under Recommended Operating Conditions with RL = 8 Ω and TJ ≤ 125°C.
How does the ILIM pin on the OPA548FKTWT set the current limit?
The ILIM pin on the OPA548FKTWT accepts a control current between 0 µA and 330 µA to set the output current limit from 0 A to 5 A. Connecting a resistor between ILIM and V− implements this per the equation ILIM = (15000)(4.75)/(13750 Ω + RCL). For example, a 14.7-kΩ resistor sets ~2.5 A. Leaving ILIM open disables output (0 A); tying it directly to V− yields ~5 A. This indirect sensing avoids power loss in the output path - a key differentiator of the OPA548FKTWT.
Can the OPA548FKTWT operate from an asymmetric power supply?
Yes, the OPA548FKTWT supports asymmetric supplies - for example, +55 V and –5 V - as long as the total supply voltage (V+ to V−) remains within 8 V to 60 V. Its input common-mode range extends to (V−) – 0.1 V and (V+) – 3 V, and output swing remains functional across this rail imbalance. This flexibility makes the OPA548FKTWT suitable for specialized test fixtures and actuator drivers where positive and negative voltage ranges differ significantly.
What is the function of the E/S pin on the OPA548FKTWT?
The E/S (Enable/Status) pin on the OPA548FKTWT serves two distinct roles: as an input, pulling it ≤(V− + 0.8 V) disables the output stage in 1 µs and reduces quiescent current to ±6 mA; as an output, it reports thermal shutdown status - sourcing ~3.5 V normally and sinking 5 µA to pull down to ~0.35 V when junction temperature exceeds 160°C. Both functions operate under single- or dual-supply configurations, making the OPA548FKTWT uniquely suited for fault-aware, power-managed systems.
Does the OPA548FKTWT require external compensation for stability?
The OPA548FKTWT is internally compensated for unity-gain stability with purely resistive loads, but reactive or highly capacitive loads (>1000 pF) may require external output-stage compensation - typically a series RC snubber (e.g., 10 Ω + 100 nF) between VO and load. Figure 38 in the OPA548FKTWT datasheet provides validated values. Instability manifests as overshoot or ringing in step response; small-signal overshoot vs capacitance data (Figure 19) guides selection. Without compensation, driving piezoelectric transducers or long cables risks oscillation.
OPA548FKTWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Power
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 100 nA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 17mA
- Current - Output / Channel:
- 5 A
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 60 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-7)
OPA548FKTWT FAQ
1.How can I place an order for OPA548FKTWT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA548FKTWT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for OPA548FKTWT reliable?
The price and inventory of OPA548FKTWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA548FKTWT is usually 5 days.
3.What payment methods are accepted for OPA548FKTWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA548FKTWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA548FKTWT?
OPA548FKTWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA548FKTWT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for OPA548FKTWT?
For technical support, including OPA548FKTWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA548FKTWT requirements.
6.How does Aetrix verify that OPA548FKTWT is sourced from the original manufacturer or authorized distributors?
All OPA548FKTWT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPA548FKTWT meets industry standards.
7.What is the process for return or replacement of OPA548FKTWT?
All OPA548FKTWT units undergo pre-shipment inspection (PSI). If there is an issue with OPA548FKTWT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The OPA548FKTWT part is unused and in its original packaging.
Return procedure for OPA548FKTWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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