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Texas Instruments OPA551UA/2K5
- Part No.:
- OPA551UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA551UA/2K5.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,131
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Product details
Overview
OPA551UA/2K5 from Texas Instruments is a high-voltage, high-current operational amplifier optimized for unity-gain stability, delivering ±200 mA continuous output current with ±30 V supply capability, 15 V/µs slew rate, and 3 MHz bandwidth. It operates across –40°C to +125°C and features thermal shutdown with flag output, making it suitable for industrial servo drivers and high-power audio amplification stages.
For engineers reviewing the OPA551UA/2K5 datasheet, OPA551UA/2K5 pinout, OPA551UA/2K5 application, or OPA551UA/2K5 equivalent, key selection criteria include its rail-to-rail output swing (within 2 V of rails), low 14 nV/√Hz input voltage noise, internal current limiting (±380 mA short-circuit), and SOIC-8 package compatibility with standard PCB layouts for high-current analog signal conditioning.
Technical Context
The OPA551UA/2K5 implements a laser-trimmed monolithic architecture with a high-current output stage capable of driving reactive and capacitive loads up to 10 nF while maintaining stability at unity gain. Its fully differential input stage provides 1013 Ω || 2 pF differential impedance and 92–102 dB CMRR over –27.5 V to +27.5 V common-mode range.
Thermal protection is implemented via junction-sensing circuitry that disables the output at ~160°C and re-enables at ~140°C, with a dedicated open-collector flag pin sourcing 120 µA during shutdown. Input clamping diodes and internal current limiting (±380 mA) provide robust fault tolerance without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±4 V to ±30 V - supports wide industrial power rails including ±15 V and ±24 V systems |
| Continuous Output Current | ±200 mA - drives heavy loads such as piezoelectric transducers or motor windings directly |
| Slew Rate | ±15 V/µs - enables fast settling for step-driven test equipment and servo position loops |
| Bandwidth (GBW) | 3 MHz - sufficient for closed-loop gains up to 10 with stable phase margin at unity gain |
| Input Voltage Noise | 14 nV/√Hz @ 1 kHz - preserves SNR in low-level sensor signal amplification paths |
| Output Swing | Within 2 V of rails @ ±200 mA - delivers maximum dynamic range into 3 kΩ loads |
| Thermal Shutdown Threshold | Junction temperature ~160°C - protects against sustained overload or inadequate heatsinking |
Pinout & Package
OPA551UA/2K5 is housed in an 8-pin SOIC package (4.9 mm × 3.91 mm body size) with exposed pad not electrically connected. Pin 1 is marked by a beveled corner; the device uses standard SOIC footprint and reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V– | Negative supply terminal | Connects to lowest system potential; internally tied to DDPAK tab in KTW variant (not applicable to SOIC) |
| V+ | Positive supply terminal | Accepts highest system voltage; must be bypassed with ≥0.1 µF ceramic capacitor near pin |
| +IN | Noninverting input | Differential input node with 1013 Ω || 2 pF impedance; accepts common-mode voltages from (V–)+2.5 V to (V+)-2.5 V |
| –IN | Inverting input | Differential input node; used for feedback configuration; protected by internal clamp diodes |
| OUT | Amplifier output | High-current output stage capable of ±200 mA DC and ±380 mA short-circuit; drives capacitive loads up to 10 nF |
| Flag | Thermal shutdown indicator | Open-collector output sourcing ≤50 nA normal / ~120 µA during shutdown; interfaces directly to HCT or CMOS logic |
| NC | No connection | Pins 1 and 5 in SOIC package are unconnected; must remain floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Guaranteed stable operation with no external compensation required in G = 1 configurations |
| Integrated thermal shutdown with flag | Provides real-time die temperature monitoring via current-source flag pin (120 µA typical during shutdown) |
| Internal current limiting | Limits output to ±380 mA under overload, preventing damage during short-circuit or capacitive load transients |
| Rail-to-rail output swing | Delivers >93% of full supply range (e.g., ±28 V with ±30 V supplies) at 200 mA load |
| Laser-trimmed input offset | ±1 mV typical offset voltage (±3 mV max), enabling precision DC-coupled servo and transducer excitation |
Applications
| Telephony Line Driver | Industrial Servo Amplifier |
|---|---|
Use Scenario: Driving balanced analog telephone line interfaces requiring high voltage swing and fault tolerance. IC Role / Device Role / Timing Role: Final-stage line driver amplifier delivering ±24 V peak-to-peak signals into 600 Ω hybrid circuits. Use Value: Wide ±30 V supply range and ±200 mA output enable compliance with GR-909 and ITU-T G.712 linearity specs without external boost stages. |
Use Scenario: Closed-loop position control of DC brush motors in factory automation systems. IC Role / Device Role / Timing Role: High-current error amplifier converting encoder feedback into proportional drive voltage. Use Value: 15 V/µs slew rate ensures <2 µs settling for 10-V step commands, supporting 50 kHz servo loop bandwidths. |
| Audio Power Stage | Transducer Excitation |
Use Scenario: Low-distortion headphone or speaker driver in portable test instrumentation. IC Role / Device Role / Timing Role: Unity-gain buffer amplifying DAC outputs to drive 32 Ω or 600 Ω loads. Use Value: 0.0005% THD+N at 15 VRMS ensures fidelity in audio spectral analysis and calibration equipment. |
Use Scenario: Exciting piezoelectric actuators in precision motion control platforms. IC Role / Device Role / Timing Role: High-voltage, high-slew-rate driver generating bipolar waveforms up to ±28 V. Use Value: 3 MHz bandwidth and 2 V rail headroom support 100 kHz sinusoidal excitation with <0.1% harmonic distortion. |
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 |
|---|---|---|---|
| OPA552UA/2K5 | Optimized for G ≥ 5; higher 24 V/µs slew rate and 12 MHz bandwidth but unstable at unity gain | Requires minimum gain of 5; unsuitable for G = 1 buffer or inverting configurations without external compensation | Select OPA552UA/2K5 only when closed-loop gain ≥ 5 and bandwidth > 3 MHz is required |
| OPA547T | Higher 1 A output current, programmable current limit, and disable function; larger TO-220 package | Designed for standalone power amplifier modules rather than embedded PCB-level integration | Choose OPA547T when >200 mA output or active current limiting is mandatory and board space allows TO-220 mounting |
Compared with OPA551UA/2K5, the OPA552UA/2K5 offers superior speed but sacrifices unity-gain stability, while the OPA547T trades compact SOIC integration for higher current and programmability-making OPA551UA/2K5 the optimal balance of performance, stability, and board-level deployability.
Availability
OPA551UA/2K5 is available at Aetrix Electronics and suitable for industrial servo drivers, telephony line interfaces, high-fidelity audio power stages, and precision transducer excitation requiring stable component supply across extended temperature ranges.
Supply support for OPA551UA/2K5 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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision amplifiers and high-reliability industrial ICs.
The OPA551UA/2K5 belongs to TI's OPA55x high-voltage op-amp family, designed specifically for applications demanding both high output current and wide supply voltage range in compact surface-mount packages.
FAQ
What is the maximum continuous output current specification for the OPA551UA/2K5?
The OPA551UA/2K5 delivers ±200 mA continuous output current into resistive loads at TJ = 25°C with ±30 V supplies. This rating decreases with rising junction temperature and is limited to ±380 mA short-circuit current. Derating curves in the datasheet show usable current drops to ~±150 mA at 125°C ambient with proper PCB copper area.
Does the OPA551UA/2K5 require external compensation for unity-gain operation?
No, the OPA551UA/2K5 is internally compensated for unity-gain stability and operates reliably with no external components in G = 1 configurations. Unlike the OPA552, it does not require compensation networks for stability at low gains, simplifying design for buffer and inverting amplifier applications.
How does the Flag pin on the OPA551UA/2K5 function during thermal shutdown?
During normal operation, the Flag pin sources <50 nA. When junction temperature reaches ~160°C, the internal thermal shutdown activates and the Flag pin sources ~120 µA (typical), providing a clean logic-level signal compatible with HCT or CMOS inputs. The output resets automatically when die cools to ~140°C.
Can the OPA551UA/2K5 drive capacitive loads, and what is the maximum stable value?
Yes, the OPA551UA/2K5 can drive capacitive loads up to 10 nF while maintaining stability in unity-gain configuration. For loads >1 nF, TI recommends adding a small series resistor (e.g., 10 Ω) between the output and load to isolate capacitance and preserve phase margin, as shown in Figure 28 of the datasheet.
What is the input common-mode voltage range for the OPA551UA/2K5?
The OPA551UA/2K5 supports a common-mode input voltage range from (V–) + 2.5 V to (V+) – 2.5 V at TJ = 25°C. Over the full temperature range (–40°C to +125°C), this degrades slightly to (V–) + 2 V to (V+) – 2.7 V, enabling operation with inputs near either supply rail in most industrial signal conditioning applications.
OPA551UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 15V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 7mA
- Current - Output / Channel:
- 200 mA
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 60 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA551UA/2K5 FAQ
1.How can I place an order for OPA551UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA551UA/2K5 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 OPA551UA/2K5 reliable?
The price and inventory of OPA551UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA551UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA551UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA551UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA551UA/2K5?
OPA551UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA551UA/2K5 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 OPA551UA/2K5?
For technical support, including OPA551UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA551UA/2K5 requirements.
6.How does Aetrix verify that OPA551UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA551UA/2K5 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 OPA551UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA551UA/2K5?
All OPA551UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA551UA/2K5, 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 OPA551UA/2K5 part is unused and in its original packaging.
Return procedure for OPA551UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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