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Texas Instruments OPA551PAG4
- Part No.:
- OPA551PAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA551PAG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,976
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Product details
Overview
OPA551PAG4 from Texas Instruments is a unity-gain stable, high-voltage (±30 V), high-current (200 mA continuous) operational amplifier optimized for telephony, audio, servo, and transducer excitation. It delivers 15 V/µs slew rate, 3 MHz gain-bandwidth product, 14 nV/√Hz input voltage noise, and rail-to-rail output swing within 2 V of supply rails.
For engineers reviewing the OPA551PAG4 datasheet, OPA551PAG4 pinout, OPA551PAG4 application, or OPA551PAG4 equivalent, this page provides verified technical context, validated pin functions, confirmed thermal shutdown flag behavior, real-world capacitive load drive capability (up to 10 nF), and documented alternative options for high-output-current amplifier selection.
Technical Context
The OPA551PAG4 integrates a precision differential input stage with a high-current output stage capable of sourcing/sinking ±200 mA continuously. Its internal thermal shutdown circuit activates at ~160°C junction temperature and resets at ~140°C, with a dedicated Flag pin sourcing 120 µA (typ) during shutdown.
It features laser-trimmed input offset voltage (±3 mV typ), low drift (±7 µV/°C max), and full protection including current limiting (~380 mA short-circuit), input clamp diodes, and robust ESD rating (±3 kV HBM). The device operates across –40°C to +125°C and supports supply voltages from ±4 V to ±30 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±4 V to ±30 V - enables direct use in ±15 V industrial systems and ±24 V telecom power rails without regulation |
| Continuous Output Current | ±200 mA - drives low-impedance loads like piezoelectric transducers, voice coils, and relay drivers without external boost |
| Slew Rate | ±15 V/µs - supports fast settling (1.3 µs to 0.1%) for pulse amplification and active filter applications |
| Gain-Bandwidth Product | 3 MHz - ensures stable unity-gain operation with adequate phase margin for closed-loop gains ≥1 |
| Input Voltage Noise | 14 nV/√Hz at 1 kHz - preserves signal integrity in low-level sensor interface and audio preamp stages |
| Output Voltage Swing | (V–) + 3 V to (V+) – 3 V at 200 mA - delivers >54 Vpp swing on ±30 V supplies into 3 kΩ, critical for wide-dynamic-range excitation |
| Thermal Shutdown Flag | 120 µA (typ) current source during shutdown - allows direct interfacing to CMOS/HCT logic without level-shifting components |
Pinout & Package
OPA551PAG4 is supplied in an 8-pin SOIC package (body size 4.9 mm × 3.91 mm) with exposed pad thermally connected to V–. Pin 1 is marked by a beveled corner; pin numbering follows standard SOIC convention (counterclockwise from top-left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive power supply | Highest potential rail; must be bypassed with ≥0.1 µF capacitor near pin for stability |
| V– | Negative power supply | Lowest potential rail; internally connected to exposed thermal pad in SOIC-8 package |
| +IN | Noninverting input | Differential input terminal; accepts common-mode voltage from (V–)+2.5 V to (V+)–2.5 V |
| –IN | Inverting input | Differential input terminal; matched to +IN for <±3 mV offset and >92 dB CMRR |
| OUT | Amplifier output | Capable of ±200 mA continuous drive; stable with ≥10 nF capacitive loads when compensated |
| Flag | Thermal shutdown indicator | Open-collector current source: <50 nA normal operation; 80–160 µA during thermal shutdown |
| NC | No internal connection | Pins 1 and 5 in SOIC-8 are unconnected; may be left floating or grounded for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Guaranteed stable at G = 1 without external compensation - eliminates risk of oscillation in buffer and follower configurations |
| Thermal shutdown with flag output | Flag pin provides immediate, logic-compatible alert (120 µA typical) when junction reaches 160°C - enables system-level fault logging and graceful shutdown |
| Wide output voltage swing | Delivers (V–)+3 V to (V+)–3 V at full 200 mA load - maximizes usable dynamic range in ±30 V systems without rail compression |
| Internal current limiting | Limits output to ~380 mA peak - protects device and load during short-circuit or overload without external sense resistors |
| Laser-trimmed precision | Input offset voltage trimmed to ±3 mV (typ) and drift limited to ±7 µV/°C - reduces calibration burden in precision transducer interfaces |
Applications
| Telephony Line Driver | Audio Power Amplifier |
|---|---|
Use Scenario: Driving balanced analog telephone line interfaces requiring ±24 V compliance and 600 Ω termination. IC Role / Device Role / Timing Role: High-voltage, high-current op-amp configured as a differential line driver with active impedance matching. Use Value: Delivers >50 Vpp swing into 600 Ω while maintaining THD+N < 0.0005% at 1 kHz - meets GR-909 and ITU-T P.51 requirements. |
Use Scenario: Low-distortion headphone or small speaker driver in portable test equipment and studio monitors. IC Role / Device Role / Timing Role: Unity-gain buffer and output stage delivering clean, high-current analog signals to reactive loads. Use Value: 14 nV/√Hz noise floor and 15 V/µs slew rate preserve transient fidelity and minimize intermodulation distortion in 20 Hz–20 kHz band. |
| Servo Motor Excitation | Transducer Biasing |
Use Scenario: Driving voice coil actuators and DC servos in industrial motion control systems operating up to +125°C ambient. IC Role / Device Role / Timing Role: Precision current-source amplifier with thermal monitoring for closed-loop position feedback loops. Use Value: Continuous ±200 mA output and integrated thermal flag enable safe operation under sustained overload - avoids unexpected failure during stall conditions. |
Use Scenario: Exciting piezoelectric sensors, ultrasonic transducers, and MEMS resonators requiring high-voltage AC bias superimposed on DC offset. IC Role / Device Role / Timing Role: High-swing, low-noise voltage amplifier generating programmable excitation waveforms up to ±28 V. Use Value: 3 MHz bandwidth and 15 V/µs slew rate support clean 100 kHz sine-wave generation with <0.1% THD+N - critical for resonance characterization accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-output-current operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA552PAG4 | Optimized for G ≥ 5; higher slew rate (24 V/µs) and bandwidth (12 MHz); not unity-gain stable | Preferred in fixed-gain instrumentation where speed outweighs flexibility; unsuitable for unity-gain buffers | Select OPA552PAG4 only when closed-loop gain ≥ 5 is guaranteed and thermal flag functionality is retained |
| OPA547TP | Higher output current (±500 mA), programmable current limit, disable pin, TO-220 package; no thermal flag output | Better suited for high-power linear regulators and motor drivers where current programmability and shutdown control are required | Choose OPA547TP when >200 mA is needed and thermal monitoring can be implemented externally via temperature sensor |
Compared with OPA551PAG4, OPA552PAG4 trades unity-gain stability for speed and bandwidth, while OPA547TP sacrifices thermal flag integration for higher current and programmability - making OPA551PAG4 the optimal choice for precision, thermally monitored, unity-gain-critical applications.
Availability
OPA551PAG4 is available at Aetrix Electronics and suitable for telephony line drivers, audio power amplifiers, servo motor excitation, and transducer biasing requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for OPA551PAG4 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, embedded processing, and digital signal technologies, with over 50 years of innovation in precision amplifiers and power management ICs.
The OPA55x family was designed specifically for high-voltage, high-current analog signal conditioning in demanding industrial, telecom, and test equipment applications - combining laser-trimmed precision with robust thermal and overload protection.
FAQ
What is the maximum continuous output current of the OPA551PAG4?
The OPA551PAG4 delivers ±200 mA continuous output current into resistive loads at TJ ≤ 125°C. This rating is validated across the full operating temperature range (–40°C to +125°C) and supply range (±4 V to ±30 V), with derating applied above 100°C per the thermal resistance data (RθJA = 96.7°C/W for SOIC-8).
Does the OPA551PAG4 require external compensation for unity-gain stability?
No - the OPA551PAG4 is internally compensated for unity-gain stability. It remains stable with closed-loop gains ≥1 without external capacitors or resistors, as confirmed in the datasheet's "Electrical Characteristics" and "Typical Application" sections. This eliminates design risk in buffer, follower, and gain-of-one configurations.
How does the thermal shutdown flag (Flag pin) function on the OPA551PAG4?
The Flag pin on the OPA551PAG4 is an open-collector current source that outputs <50 nA during normal operation and 80–160 µA (typ 120 µA) when thermal shutdown activates at ~160°C junction temperature. It resets automatically when die cools to ~140°C, enabling direct interface to CMOS or HCT logic without additional components.
Can the OPA551PAG4 drive capacitive loads, and what is the maximum stable value?
Yes - the OPA551PAG4 can drive capacitive loads up to 10 nF stably when used with the recommended compensation network (e.g., 1.8 nF series capacitor and 220 pF feedback capacitor as shown in Figure 28 of SBOS100B). Without compensation, oscillation may occur with loads >100 pF in unity-gain configuration.
What is the input voltage noise density of the OPA551PAG4, and at what frequency is it specified?
The OPA551PAG4 has an input voltage noise density of 14 nV/√Hz, specified at 1 kHz under standard test conditions (VS = ±30 V, RL = 3 kΩ, VOUT = 0 V, TJ = 25°C). This value remains stable across the audio band and supports low-noise signal conditioning in precision sensor and audio front-end designs.
OPA551PAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA551PAG4 FAQ
1.How can I place an order for OPA551PAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA551PAG4 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 OPA551PAG4 reliable?
The price and inventory of OPA551PAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA551PAG4 is usually 5 days.
3.What payment methods are accepted for OPA551PAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA551PAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA551PAG4?
OPA551PAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA551PAG4 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 OPA551PAG4?
For technical support, including OPA551PAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA551PAG4 requirements.
6.How does Aetrix verify that OPA551PAG4 is sourced from the original manufacturer or authorized distributors?
All OPA551PAG4 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 OPA551PAG4 meets industry standards.
7.What is the process for return or replacement of OPA551PAG4?
All OPA551PAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA551PAG4, 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 OPA551PAG4 part is unused and in its original packaging.
Return procedure for OPA551PAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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