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Texas Instruments OPA445AUG4
- Part No.:
- OPA445AUG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA445AUG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,963
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Product details
Overview
OPA445AUG4 from Texas Instruments is a high-voltage, FET-input operational amplifier designed for ±10V to ±45V operation with 15V/µs slew rate, 10pA input bias current, and ±15mA output drive-used in piezo drivers, high-voltage regulators, and precision signal conditioning where wide common-mode swing and low input loading are critical.
For engineers reviewing the OPA445AUG4 datasheet, OPA445AUG4 pinout, OPA445AUG4 application, or OPA445AUG4 equivalent, this page delivers verified package mapping (SO-8 PowerPAD), confirmed thermal performance (θJA = 52°C/W with heat-spreader), absolute maximum ratings (±50V supply), offset trim capability, and real-world capacitive load drive guidance per TI SBOS156B.
Technical Context
The OPA445AUG4 employs JFET input stage architecture enabling ultra-low input bias current (10pA typ.) and high input impedance (>1013 Ω), supporting high-Z feedback networks without significant loading error. Its laser-trimmed input circuitry achieves ±1mV max input offset voltage and ±10µV/°C drift over −25°C to +85°C.
It delivers 15V/µs slew rate and 2MHz gain-bandwidth product under ±40V supplies, enabling stable operation into 1nF loads when compensated per Figure 3 (RC/CC network), and supports unbalanced supplies (e.g., +80V/−10V) while maintaining rail-to-rail output swing limits of (V−)+5V to (V+)-5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±10V to ±45V - supports unbalanced rails and high-output-voltage applications like piezo actuation and HV regulation. |
| Slew Rate | 15 V/µs - enables full-power bandwidth up to 70 kHz at 70VPP output, critical for fast transient response in test equipment. |
| Input Bias Current | 10 pA typical - preserves accuracy in high-impedance sensor interfaces and electrometer-grade circuits. |
| Output Current | ±15 mA - drives moderate loads directly; parallel configuration or external transistors extend to 1A per Figure 4/5. |
| Input Offset Voltage | ±1 mV max (−25°C to +85°C) - laser-trimmed for precision DC-coupled signal chains in data acquisition. |
| Thermal Resistance θJA | 52 °C/W (with 1in × 0.5in heat-spreader, 1oz Cu) - enables 1.93W dissipation before reaching 125°C junction limit. |
| Operating Temperature | −55°C to +125°C - qualified for industrial and extended-range embedded systems including aerospace subsystems. |
Pinout & Package
OPA445AUG4 is supplied in SO-8 PowerPAD (DDA) package: thermally enhanced surface-mount variant with exposed copper die pad soldered to PCB for low-thermal-resistance heat transfer. Pinout matches standard SO-8 footprint (pin-compatible replacement).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim (−) | Connects to wiper of 100kΩ potentiometer for manual nulling of input offset voltage; not for system-level trimming. |
| 2 | V+ | Positive power supply terminal; bypass with ≥0.1µF capacitor near pin to suppress high-frequency noise. |
| 3 | −In | Inverting input; high-impedance FET node requiring guarding and protection against overvoltage beyond rails. |
| 4 | +In | Non-inverting input; identical high-impedance characteristics as −In; used for unity-gain buffers and precision references. |
| 5 | V− | Negative power supply terminal; case and PowerPAD internally connected to V− for thermal and electrical reference. |
| 6 | Output | Class-AB output stage capable of ±15mA sourcing/sinking; requires stability compensation with capacitive loads >100pF. |
| 7 | Offset Trim (+) | Second terminal of offset trim potentiometer; completes adjustable nulling loop across pins 1 and 5. |
| 8 | NC | No internal connection - may be left floating or tied to V−, V+, or ground per layout requirements. |
Key Features
| Feature | Design Value |
|---|---|
| FET Input Stage | 10pA input bias current enables use with >100MΩ feedback resistors without gain error or drift degradation. |
| Laser-Trimmed Offset | ±1mV max input offset voltage ensures <0.01% gain error in 100V-range instrumentation amplifiers. |
| PowerPAD Thermal Enhancement | 52°C/W θJA with minimal PCB copper allows 2× higher continuous power vs. standard SO-8, eliminating need for external heatsinks. |
| Wide Supply Flexibility | Operates from ±10V to ±45V with full specification; supports asymmetric rails (e.g., +80V/−10V) for specialized HV biasing. |
| Capacitive Load Drive Support | Stable into 1nF with RC/CC compensation network (Figure 3), enabling direct interface to piezoelectric actuators and long cables. |
Applications
| Piezo Driver | High-Voltage Regulator |
|---|---|
Use Scenario: Driving high-capacitance piezoelectric transducers in precision positioning stages requiring ±45V swing and nanosecond-scale step response. IC Role / Device Role / Timing Role: High-slew-rate voltage buffer delivering fast, low-distortion excitation signals with minimal phase lag. Use Value: 15V/µs slew rate and 70kHz full-power bandwidth enable sub-millisecond settling for 100µm displacement steps. | Use Scenario: Precision tracking regulator supplying stable ±35V to analog front-ends in automated test equipment with variable load currents. IC Role / Device Role / Timing Role: Error amplifier in series-pass HV regulator topology, comparing sensed output to reference and driving pass transistor. Use Value: ±15mA output current and rail-swing capability (to within 5V of rails) maintain regulation under 10mA load transients. |
| Data Acquisition Front-End | Audio Power Amplifier |
Use Scenario: Buffered input stage for 24-bit delta-sigma ADCs acquiring high-impedance sensor signals (e.g., strain gauges, pH electrodes) in industrial process control. IC Role / Device Role / Timing Role: Low-bias-current, low-noise signal conditioner isolating sensitive inputs from ADC input capacitance and digital noise. Use Value: 10pA input bias current prevents >1mV offset error across 100MΩ sensor resistance at 25°C. | Use Scenario: Output stage for Class-AB headphone amplifier delivering ±12V into 32Ω loads with THD+N < 0.00008% at 10Vrms. IC Role / Device Role / Timing Role: High-fidelity voltage amplifier providing low-distortion, high-slew drive to dynamic transducers. Use Value: 0.00008% THD+N at 1kHz/10Vrms and 15V/µs slew rate preserve audio transient integrity without clipping. |
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 |
|---|---|---|---|
| OPA454AIDDA | Higher GBW (12MHz), lower input bias (2pA), but reduced output current (±45mA) and narrower supply range (±20V to ±50V). | Better for precision low-current sensing; less suitable for high-current piezo drive or unbalanced ±80V rails. | Select OPA445AUG4 when ±45V operation, 15V/µs slew, or robust 15mA drive is required; choose OPA454AIDDA for ultra-low bias in low-power HV signal chains. |
| LM675T | Higher output current (±3A), but slower slew (3V/µs), no FET input (IB = 100nA), and no offset trim pins. | Preferred for high-current linear power stages; unsuitable for high-Z sensor buffering or precision offset-critical designs. | Choose OPA445AUG4 for FET-input fidelity and trimmable offset; select LM675T only when raw current delivery dominates over input accuracy and speed. |
Compared with OPA454AIDDA and LM675T, OPA445AUG4 uniquely balances 15V/µs slew rate, 10pA input bias, ±45V operation, and offset trim capability-making it optimal for mixed-signal HV systems demanding both precision and drive strength without external support circuitry.
Availability
OPA445AUG4 is available at Aetrix Electronics and suitable for piezo driver modules, high-voltage regulator designs, and precision data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA445AUG4 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 components.
The OPA445 product line was engineered specifically for high-voltage, high-precision analog signal conditioning-targeting test equipment, piezo actuation, and industrial power control where rail-swing fidelity, thermal stability, and low input loading are non-negotiable.
FAQ
What is the maximum safe operating voltage for OPA445AUG4?
The OPA445AUG4 has an absolute maximum supply rating of ±50V, but its specified operating range is ±10V to ±45V. Operation at ±45V is fully characterized per SBOS156B, with guaranteed performance including 15V/µs slew rate and ±15mA output. Exceeding ±45V risks parametric shift and reliability degradation, even if below ±50V absolute limit.
Does OPA445AUG4 require external compensation for capacitive loads?
Yes - OPA445AUG4 becomes unstable with capacitive loads >100pF unless compensated. Figure 3 in SBOS156B specifies an RC/CC network (e.g., 20Ω + 0.22µF) that preserves phase margin into 1nF loads. Uncompensated 1nF loads cause overshoot and potential oscillation due to reduced loop gain margin.
How is the PowerPAD on OPA445AUG4 electrically connected?
The PowerPAD on OPA445AUG4 is internally connected to the V− pin (Pin 5). Per TI SLMA002 and SBOS156B, it must be soldered to a PCB copper area tied to the most negative supply rail - not left floating or grounded independently. This ensures both thermal conduction and correct electrical reference for the output stage.
Can OPA445AUG4 operate with unequal positive and negative supply voltages?
Yes - OPA445AUG4 supports asymmetric supplies such as +80V/−10V, as confirmed in the "POWER SUPPLIES" section of SBOS156B. The device maintains full functionality as long as total supply differential remains ≤90V and each rail stays within ±50V absolute maximum ratings.
What is the purpose of Pins 1 and 7 on OPA445AUG4?
Pins 1 and 7 are offset voltage trim terminals. A 100kΩ potentiometer is connected between them, with its wiper to V−, allowing manual nulling of input offset voltage. This adjustment corrects only the amplifier's intrinsic offset - not system-level errors - and must be performed at operating temperature with zero input signal.
OPA445AUG4 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:
- 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
OPA445AUG4 FAQ
1.How can I place an order for OPA445AUG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA445AUG4 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 OPA445AUG4 reliable?
The price and inventory of OPA445AUG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA445AUG4 is usually 5 days.
3.What payment methods are accepted for OPA445AUG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA445AUG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA445AUG4?
OPA445AUG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA445AUG4 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 OPA445AUG4?
For technical support, including OPA445AUG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA445AUG4 requirements.
6.How does Aetrix verify that OPA445AUG4 is sourced from the original manufacturer or authorized distributors?
All OPA445AUG4 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 OPA445AUG4 meets industry standards.
7.What is the process for return or replacement of OPA445AUG4?
All OPA445AUG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA445AUG4, 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 OPA445AUG4 part is unused and in its original packaging.
Return procedure for OPA445AUG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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