My Inquiry
My Account
Texas Instruments OPA551UAG4
- Part No.:
- OPA551UAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA551UAG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,551
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA551UAG4 from Texas Instruments is a unity-gain stable, high-voltage (±30 V), high-current (200 mA continuous) operational amplifier with 15 V/µs slew rate, 3 MHz gain-bandwidth product, and thermal shutdown flag output - used in precision servo drivers, audio power stages, and transducer excitation circuits requiring rail-to-rail swing capability and robust overload protection.
For engineers reviewing the OPA551UAG4 datasheet, OPA551UAG4 pinout, OPA551UAG4 application, or OPA551UAG4 equivalent, this page delivers verified electrical specifications, SOIC-8 package mapping, thermal flag interface guidance, and validated alternative options for high-output-current op-amp selection in industrial and test equipment designs.
Technical Context
The OPA551UAG4 integrates a laser-trimmed input stage with a high-current bipolar output stage capable of sourcing/sinking ±200 mA continuously while maintaining low input offset voltage (±3 mV typ) and 14 nV/√Hz input voltage noise. Its internal thermal shutdown circuit activates at ~160°C junction temperature and asserts a current-source flag output (120 µA typ) to signal fault condition.
Designed for unity-gain stability, it features fully differential input architecture with 10¹³ Ω || 2 pF input impedance, 92–102 dB CMRR over –27.5 V to +27.5 V common-mode range, and output swing within 3 V of rails at full load - enabling direct drive of reactive and capacitive loads up to 10 nF without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±4 V to ±30 V - supports wide industrial and test-equipment supply rails including ±15 V and ±24 V systems. |
| Continuous Output Current | ±200 mA - drives heavy loads such as piezoelectric transducers, solenoid coils, and audio speaker outputs without external boost. |
| Slew Rate | ±15 V/µs - enables fast settling (1.3 µs to 0.1%) for step-driven control loops and pulse amplification. |
| Gain-Bandwidth Product | 3 MHz - provides stable closed-loop bandwidth up to ~1.5 MHz at G = 2, suitable for servo position feedback and active filtering. |
| Input Voltage Noise | 14 nV/√Hz at 1 kHz - preserves signal integrity in low-level sensor conditioning and precision measurement front-ends. |
| Thermal Shutdown Flag | Current-source output (120 µA typ during shutdown) - directly interfaces with CMOS/HCT logic for system-level fault monitoring without level-shifting. |
| Output Voltage Swing | (V−) + 3 V to (V+) − 3 V at ±200 mA - delivers usable dynamic range across full load current in ±30 V supplies. |
| Operating Temperature | −40°C to +125°C - qualified for extended industrial environments including motor control cabinets and outdoor test instrumentation. |
Pinout & Package
OPA551UAG4 is supplied in an 8-pin SOIC (Small Outline Integrated Circuit) package with body size 4.9 mm × 3.91 mm. The exposed pad is not present; thermal dissipation relies on PCB copper area and RθJA = 96.7°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V− | Negative supply terminal - connects to lowest potential rail; internally tied to DDPAK tab in alternate package. |
| 2 | −IN | Inverting input - high-impedance node (10¹³ Ω || 6 pF) with ±100 pA bias current; accepts signals within (V−)+2.5 V to (V+)-2.5 V. |
| 3 | +IN | Noninverting input - matched to −IN for <±3 mV offset; requires symmetrical layout to minimize thermal EMF errors. |
| 4 | V− | Second negative supply connection - electrically tied to Pin 1; improves PSRR and reduces ground bounce in high-current switching. |
| 5 | NC | No internal connection - must be left floating; not bonded or connected internally in SOIC-8 variant. |
| 6 | OUT | High-current output - delivers ±200 mA into resistive loads or stable operation into ≥10 nF capacitive loads with proper compensation. |
| 7 | V+ | Positive supply terminal - highest potential rail; bypass with ≥0.1 µF ceramic capacitor near pin for stability. |
| 8 | Flag | Thermal shutdown indicator - open-collector current source (50 nA normal / 120 µA shutdown) referenced to V−. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Guaranteed stable at G = 1 without external compensation - eliminates need for gain-setting resistors in buffer configurations. |
| Thermal shutdown with flag | Flag pin sources 120 µA (typ) when TJ ≥ 160°C - enables real-time fault detection and system-level thermal management. |
| Output current limiting | Internal limit at ±380 mA short-circuit - protects device and load during transient overloads without latch-up. |
| Rail-swing output stage | Delivers (V−)+3 V to (V+)−3 V at ±200 mA - maximizes usable output range in ±30 V supplies for transducer excitation. |
| Laser-trimmed input stage | ±3 mV max input offset voltage (25°C), ±5 mV over −40°C to +125°C - ensures accuracy in closed-loop servo and precision gain blocks. |
| Low-noise architecture | 14 nV/√Hz input voltage noise + 3.5 fA/√Hz current noise - maintains SNR in low-amplitude signal amplification paths. |
Applications
| Audio Amplifier Stage | Servo Motor Driver |
|---|---|
|
Use Scenario: Driving 8-Ω loudspeaker loads in portable test-tone generators and calibration audio sources. IC Role / Device Role / Timing Role: Final-stage power amplifier delivering 200 mA peak current with <0.0005% THD+N at 15 VRMS. Use Value: Eliminates need for discrete output transistors while maintaining low distortion and wide bandwidth up to 20 kHz. |
Use Scenario: Positioning control loop for industrial linear actuators requiring precise current-controlled coil drive. IC Role / Device Role / Timing Role: High-slew-rate error amplifier driving H-bridge gate drivers with ±15 V compliance and 15 V/µs transient response. Use Value: Enables sub-millisecond step response and thermal fault signaling via Flag pin to prevent coil burnout. |
| Transducer Excitation | Test Equipment Output |
|
Use Scenario: Biasing piezoelectric accelerometers and ultrasonic transducers in structural health monitoring systems. IC Role / Device Role / Timing Role: High-voltage, low-noise excitation source delivering ±25 V swing at 1 kHz with 14 nV/√Hz noise floor. Use Value: Preserves transducer signal-to-noise ratio while providing sufficient drive strength for resonant mode excitation. |
Use Scenario: Programmable voltage/current source in automated test equipment (ATE) for component characterization. IC Role / Device Role / Timing Role: Precision output stage with thermal flag feedback for safety-critical current-limit enforcement during DUT stress testing. Use Value: Integrates protection and accuracy in single IC - reducing BOM count and improving test repeatability under variable load conditions. |
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 |
|---|---|---|---|
| OPA552UAG4 | Optimized for G ≥ 5; higher slew rate (24 V/µs) and GBW (12 MHz), but unstable at unity gain. | Preferred in fixed-gain audio filters and high-speed active probes where gain >5 is acceptable. | Select OPA552UAG4 only when closed-loop gain is ≥5 and unity-gain stability is not required. |
| OPA547T | Higher output current (±500 mA), programmable current limit, and disable function; larger TO-220 package. | Used in high-power servo amplifiers and lab-grade power supplies needing adjustable current limiting. | Choose OPA547T when >200 mA output or programmable current limit is mandatory; accept larger footprint and thermal design overhead. |
Compared with OPA551UAG4, OPA552UAG4 offers superior speed but sacrifices unity-gain stability, while OPA547T trades compact SOIC-8 packaging for higher current and configurability - making OPA551UAG4 the optimal balance of size, stability, and performance for mid-power industrial amplification.
Availability
OPA551UAG4 is available at Aetrix Electronics and suitable for servo drivers, audio power stages, and transducer excitation systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for OPA551UAG4 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 power management ICs.
The OPA55x family was designed specifically for industrial and test equipment applications demanding high-voltage, high-current operational amplification with integrated thermal protection and rail-swing output capability.
FAQ
What is the maximum continuous output current of the OPA551UAG4?
The OPA551UAG4 delivers ±200 mA continuous output current into resistive loads at ambient temperatures up to +125°C. This rating is maintained across its full ±4 V to ±30 V supply range and is supported by internal current limiting that clamps short-circuit current to ±380 mA. Derating applies above +85°C per the thermal characteristics table in the datasheet.
Does the OPA551UAG4 require external compensation for unity-gain operation?
No, the OPA551UAG4 is internally compensated for unity-gain stability and operates stably with G = 1 without external components. Its 3 MHz gain-bandwidth product and 15 V/µs slew rate are fully specified under unity-gain conditions. External compensation is only needed when driving large capacitive loads (>10 nF) or in parallel configurations.
How does the Flag pin on the OPA551UAG4 function during thermal shutdown?
During normal operation, the Flag pin of the OPA551UAG4 sources less than 50 nA. When junction temperature reaches ~160°C, the internal thermal shutdown circuit activates and the Flag pin sources 120 µA (typical), allowing direct interfacing with CMOS or HCT logic inputs using a pull-down resistor. The output resets automatically when die temperature cools to ~140°C.
What is the output voltage swing capability of the OPA551UAG4 at full load?
At ±200 mA load current and ±30 V supplies, the OPA551UAG4 delivers an output voltage swing from (V−) + 3 V to (V+) − 3 V. At lighter loads (10 mA), swing improves to (V−) + 2 V to (V+) − 2.7 V. This rail-swing behavior is characterized over −40°C to +125°C and enables efficient use of supply headroom in transducer and actuator drive applications.
Can the OPA551UAG4 drive capacitive loads, and what is the recommended approach?
Yes, the OPA551UAG4 can drive capacitive loads up to 10 nF stably in unity-gain configuration. For larger loads, TI recommends adding a series resistor (e.g., 10 Ω) between the output and capacitance, or using the isolation network shown in Figure 28 of the datasheet (RF = 4 kΩ, CF = 220 pF, CS = 1.8 nF). Uncompensated drive of >10 nF may cause peaking or oscillation.
OPA551UAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- -
- 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
OPA551UAG4 FAQ
1.How can I place an order for OPA551UAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA551UAG4 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 OPA551UAG4 reliable?
The price and inventory of OPA551UAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA551UAG4 is usually 5 days.
3.What payment methods are accepted for OPA551UAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA551UAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA551UAG4?
OPA551UAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA551UAG4 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 OPA551UAG4?
For technical support, including OPA551UAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA551UAG4 requirements.
6.How does Aetrix verify that OPA551UAG4 is sourced from the original manufacturer or authorized distributors?
All OPA551UAG4 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 OPA551UAG4 meets industry standards.
7.What is the process for return or replacement of OPA551UAG4?
All OPA551UAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA551UAG4, 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 OPA551UAG4 part is unused and in its original packaging.
Return procedure for OPA551UAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA551UAG4 Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
