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Texas Instruments OPA445AU/2K5
- Part No.:
- OPA445AU/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA445AU/2K5.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,286
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Product details
Overview
OPA445AU/2K5 from Texas Instruments is a high-voltage, FET-input operational amplifier in SOIC-8 package, rated for ±10V to ±45V supply operation, 15V/µs slew rate, 10pA input bias current, and ±15mA output drive. It serves as a precision high-output-voltage signal conditioner in test equipment, piezo drivers, and high-voltage regulators where wide common-mode swing and low input loading are critical.
For engineers reviewing the OPA445AU/2K5 datasheet, OPA445AU/2K5 pinout, OPA445AU/2K5 application, or OPA445AU/2K5 equivalent, key selection considerations include its ±45V max supply rating, SOIC-8 thermal limitations (θJA = 150°C/W), offset trim capability, capacitive load stability behavior, and compatibility with high-impedance feedback networks.
Technical Context
The OPA445AU/2K5 uses JFET-input circuitry to achieve 10pA typical input bias current and >1013 Ω differential input impedance, enabling use with multi-megaohm feedback resistors without significant error. Its laser-trimmed input stage delivers ±1.5mV max input offset voltage over −25°C to +85°C and ±10µV/°C drift.
It features internal compensation optimized for unity-gain stability with resistive loads, but requires external RC isolation (e.g., 20Ω + 0.22µF) when driving >100pF capacitive loads. The device operates across −55°C to +125°C, with full electrical specifications guaranteed from −25°C to +85°C at ±40V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±10V to ±45V - supports single-rail or asymmetric rails up to 90V total, enabling direct interface with high-voltage transducers and power stages. |
| Slew Rate | 15 V/µs - ensures ≤70kHz full-power bandwidth at 70VPP output, suitable for fast transient response in piezo actuation and audio power amplification. |
| Input Bias Current | 10 pA (typ) - permits use of >10MΩ feedback networks without measurable DC error, critical for precision integrators and sensor front-ends. |
| Output Current | ±15 mA - drives 2.67kΩ minimum load at ±35V swing; sufficient for medium-power buffer stages without external boost. |
| Input Offset Voltage | ±1.5 mV (max, −25°C to +85°C) - enables sub-0.1% gain accuracy in closed-loop configurations with <100kΩ feedback. |
| Gain Bandwidth Product | 2 MHz - defines usable small-signal bandwidth at G ≥ 10; trade-off between speed and stability in high-gain, high-voltage applications. |
| Common-Mode Range | (V−) + 5V to (V+) − 5V - allows input signals within 5V of either rail, supporting rail-to-rail sensing in high-side current monitors. |
Pinout & Package
OPA445AU/2K5 is housed in an 8-pin SOIC (SO-8) surface-mount package with standard op-amp pinout and exposed pad not connected internally (non-PowerPAD variant). Thermal resistance is θJA = 150°C/W under JEDEC-standard board conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim (−) | Connects to wiper of 100kΩ potentiometer for manual nulling of input offset voltage; must be used only for op-amp offset correction. |
| 2 | Inverting Input (−In) | Differential input node with 1014 Ω || 3pF common-mode impedance; sensitive to ESD and overvoltage beyond supply rails. |
| 3 | Non-inverting Input (+In) | Differential input node; same high-impedance characteristics as Pin 2; requires symmetric layout to minimize CMRR degradation. |
| 4 | V− (Negative Supply) | Primary negative power rail connection; case (TO-99) and thermal pad (PowerPAD variants) connect to this pin, but SOIC-8 (OPA445AU/2K5) has no internal connection. |
| 5 | Offset Trim (+) | Second terminal of offset trim potentiometer; forms balanced bridge with Pin 1 to adjust input stage quiescent point. |
| 6 | Output | Class-AB output stage capable of ±15mA continuous sourcing/sinking; exhibits 220Ω open-loop output resistance. |
| 7 | V+ (Positive Supply) | Primary positive power rail connection; bypassing with ≥0.1µF ceramic capacitor near pin is mandatory for stability. |
| 8 | NC | No internal connection - may be left floating or tied to V+, V−, or ground per layout requirements; no functional impact. |
Key Features
| Feature | Design Value |
|---|---|
| FET-input architecture | Enables 10pA input bias current and >100dB CMRR, preserving accuracy in high-Z sensor interfaces and precision integrators. |
| Laser-trimmed input stage | Delivers ±1.5mV max input offset voltage and ±10µV/°C drift over −25°C to +85°C, reducing calibration burden in production systems. |
| Offset voltage trim pins (1 & 5) | Allow post-mounting nulling of op-amp intrinsic offset without affecting system-level drift performance or requiring external DACs. |
| Wide supply range (±10V to ±45V) | Eliminates need for external level-shifting or charge-pump rails in high-voltage test fixtures and industrial analog I/O modules. |
| Stable with capacitive loads ≥100pF | Supports direct driving of piezoelectric transducers and long cables when combined with recommended RC isolation network (20Ω + 0.22µF). |
Applications
| Test Equipment Signal Conditioning | High-Voltage Piezo Actuation |
|---|---|
Use Scenario: Amplifying and buffering low-current sensor outputs (e.g., strain gauges, photodiodes) in automated test systems requiring ±30V dynamic range. IC Role / Device Role / Timing Role: Precision DC-coupled gain block with ultra-low input bias current and rail-referenced common-mode rejection. Use Value: Maintains <0.01% linearity error over 70VPP swing due to 15V/µs slew rate and 2MHz GBW, enabling accurate waveform reconstruction. | Use Scenario: Driving high-capacitance piezoelectric crystals (nF-range) in nanopositioning stages and ultrasonic transmitters. IC Role / Device Role / Timing Role: High-voltage, high-slew-rate voltage source with active isolation to prevent oscillation into reactive loads. Use Value: Delivers ±45V compliant output with <5% overshoot using external RC compensation, meeting IEEE 383 vibration test standards. |
| Programmable High-Voltage Power Supply | Industrial Data Acquisition Front-End |
Use Scenario: Generating adjustable ±0–40V output from DAC-controlled reference in lab-grade bench power supplies. IC Role / Device Role / Timing Role: Output buffer and compliance amplifier in series-pass regulator topology with remote sense capability. Use Value: Sustains ±15mA output while maintaining <10ppm/°C thermal drift via laser-trimmed input stage and low PSRR (4µV/V). | Use Scenario: Isolating and scaling ±10V industrial sensor signals (e.g., RTD bridges, LVDTs) before ADC sampling in PLC analog input modules. IC Role / Device Role / Timing Role: Rail-compatible instrumentation amplifier front-end with programmable gain and offset correction. Use Value: Achieves 16-bit effective resolution by limiting input-referred noise to 15nV/√Hz and THD+N to 0.00008% at 10Vrms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA454IDDA | Higher supply range (±50V), lower input bias (3pA), but no offset trim pins and SO-8 PowerPAD only. | Better for ultra-high-Z pH sensors and MEMS biasing; unsuitable where manual offset nulling is required. | Select OPA454IDDA if maximum supply margin and lowest bias current outweigh need for trim capability. |
| LM675T | Higher output current (±3A), wider temp range (−40°C to +85°C), but lower slew rate (9V/µs) and higher input bias (250nA). | Preferred for high-current linear regulators and motor drive buffers; less suitable for precision low-drift signal chains. | Choose LM675T when output drive >100mA is mandatory and offset drift <10µV/°C is not required. |
Compared with OPA445AU/2K5, OPA454IDDA offers superior voltage headroom and input impedance but lacks offset trim; LM675T provides massive output current at the cost of precision and speed-making OPA445AU/2K5 the optimal balance for high-voltage, high-fidelity analog conditioning.
Availability
OPA445AU/2K5 is available at Aetrix Electronics and suitable for test equipment, piezo drivers, and programmable high-voltage power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for OPA445AU/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 heritage in precision op-amps and high-reliability industrial ICs.
The OPA445 belongs to TI's high-voltage precision op-amp product line, engineered specifically for applications demanding wide supply range, low input bias, and robust output drive-such as automated test equipment, scientific instrumentation, and industrial motion control.
FAQ
What is the maximum operating supply voltage for the OPA445AU/2K5?
The OPA445AU/2K5 supports a maximum supply voltage of ±45V (90V total), with absolute maximum ratings at ±50V. Operation at ±45V is fully specified across −55°C to +125°C ambient, and the device maintains 15V/µs slew rate and ±15mA output drive at this rail. Exceeding ±45V risks exceeding safe operating area limits and is not recommended for continuous use.
Does the OPA445AU/2K5 have built-in offset voltage trim capability?
Yes, the OPA445AU/2K5 provides dedicated offset trim pins (Pins 1 and 5) compatible with a 100kΩ potentiometer to null input offset voltage. This feature is retained in the SOIC-8 package variant and functions identically to TO-99 and DIP versions. The trim adjusts only the op-amp's intrinsic offset-not system-level errors-and preserves low drift performance when implemented per Figure 2 in the datasheet.
Can the OPA445AU/2K5 drive capacitive loads directly?
The OPA445AU/2K5 is not unconditionally stable into pure capacitive loads. For loads >100pF, external compensation is required: a 20Ω resistor in series with a 0.22µF capacitor placed between output and inverting input (per Figure 3). Without this network, phase margin degrades, causing peaking or oscillation-especially at gains ≤10. Resistive loads up to 2.67kΩ are stable without modification.
What is the thermal performance difference between OPA445AU/2K5 and OPA445ADDA?
The OPA445AU/2K5 (SOIC-8) has θJA = 150°C/W, while the OPA445ADDA (SO-8 PowerPAD) achieves θJA = 52°C/W with a 1in × 0.5in heat-spreader. This means the OPA445AU/2K5 reaches thermal limit ~2.9× faster under identical power dissipation. For >300mW continuous dissipation, OPA445ADDA is strongly preferred; OPA445AU/2K5 requires careful derating or forced airflow.
Is the OPA445AU/2K5 pin-compatible with other OPA445 variants?
Yes, all OPA445 variants-including OPA445AU/2K5 (SOIC-8), OPA445AP (DIP-8), OPA445BM (TO-99), and OPA445ADDA (SO-8 PowerPAD)-share identical pinout and electrical functionality. The SOIC-8 and PowerPAD packages are physically pin-compatible, though soldering the PowerPAD thermal pad is mandatory for thermal performance. No PCB redesign is needed when substituting OPA445AU/2K5 for other variants in existing layouts.
OPA445AU/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:
- 2 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 1.5 mV
- Current - Supply:
- 4.2mA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 20 V
- Voltage - Supply Span (Max):
- 90 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA445AU/2K5 FAQ
1.How can I place an order for OPA445AU/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA445AU/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 OPA445AU/2K5 reliable?
The price and inventory of OPA445AU/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA445AU/2K5 is usually 5 days.
3.What payment methods are accepted for OPA445AU/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA445AU/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA445AU/2K5?
OPA445AU/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA445AU/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 OPA445AU/2K5?
For technical support, including OPA445AU/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA445AU/2K5 requirements.
6.How does Aetrix verify that OPA445AU/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA445AU/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 OPA445AU/2K5 meets industry standards.
7.What is the process for return or replacement of OPA445AU/2K5?
All OPA445AU/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA445AU/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 OPA445AU/2K5 part is unused and in its original packaging.
Return procedure for OPA445AU/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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