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Texas Instruments OPA445APG4
- Part No.:
- OPA445APG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA445APG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,728
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Product details
Overview
OPA445APG4 from Texas Instruments is a high-voltage, FET-input operational amplifier designed for precision signal conditioning in ±10V to ±45V supply systems. It delivers 15V/µs slew rate, 10pA input bias current, and ±15mA output drive-enabling use in piezo drivers, high-voltage regulators, and test equipment requiring wide common-mode swing and low input loading.
For engineers reviewing the OPA445APG4 datasheet, OPA445APG4 pinout, OPA445APG4 application, or OPA445APG4 equivalent, key selection criteria include its ±45V max supply rating, SO-8 package thermal performance (θJA = 150°C/W), offset trim capability, and verified operation from −55°C to +125°C across all variants.
Technical Context
The OPA445APG4 employs JFET input stage architecture enabling ultra-low input bias current (10pA typ) and high input impedance (1014 Ω || 3 pF), critical for high-impedance sensor interfaces and precision integrators. Its laser-trimmed input circuitry achieves ±1.5 mV max input offset voltage with ±10 µV/°C drift over −25°C to +85°C.
Internal compensation ensures stability at unity gain while supporting full-power bandwidth up to 70 kHz (70 VPP) and open-loop gain of 110 dB. The device maintains specified performance across ±10V to ±45V supplies, with quiescent current stable at ±4.7 mA and output voltage swing limited to (V−)+5 V to (V+)−5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±10V to ±45V - supports unbalanced rails (e.g., +80V/−10V) and high-output-voltage applications without external level-shifting. |
| Slew Rate | 15 V/µs - enables clean 70 kHz full-power response at 70 VPP, essential for fast piezo actuation and pulse amplification. |
| Input Bias Current | 10 pA (typ) - minimizes error in high-Z feedback networks (e.g., >100 MΩ), preserving accuracy in electrometer-grade circuits. |
| Output Current | ±15 mA - drives moderate loads directly; parallel configuration or external transistors extend capability to 1 A per TI application note. |
| Input Offset Voltage | ±1.5 mV (max) - laser-trimmed for low DC error in precision instrumentation, with pins 1/5 supporting external nulling. |
| Operating Temperature | −55°C to +125°C - qualified for extended industrial, aerospace, and automotive under-hood environments. |
| Thermal Resistance θJA | 150°C/W (SO-8) - requires PCB copper area or thermal vias for sustained 15 mA output at ±40V without exceeding 125°C junction limit. |
Pinout & Package
OPA445APG4 is supplied in an 8-pin SOIC (D) package with standard op amp pinout and exposed pad not electrically connected. Package dimensions: 4.9 mm × 3.9 mm × 1.75 mm (JEDEC MS-012).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim (−) | Connects to wiper of 100 kΩ potentiometer for input offset nulling; must not be used to correct system-level offsets. |
| 2 | Inverting Input (−In) | High-impedance FET node; requires series resistor if input voltage exceeds supply rails to prevent gate diode conduction. |
| 3 | Non-inverting Input (+In) | Matches pin 2 in impedance and bias behavior; differential input voltage rating is ±80 V absolute max. |
| 4 | V− | Negative supply terminal; case connection in TO-99 variant, but isolated in SO-8; PowerPAD variant ties thermal pad to V−. |
| 5 | Offset Trim (+) | Paired with pin 1 for trimming; potentiometer end terminals connect to V+ and V− respectively per Figure 2 in datasheet SBOS156B. |
| 6 | Output | Capable of ±15 mA continuous sourcing/sinking; safe operating area depends on |VS − VO| and thermal design. |
| 7 | V+ | Positive supply terminal; supports up to +45 V; bypass with ≥0.1 µF ceramic capacitor placed adjacent to pin. |
| 8 | No Connect (NC) | Internally unconnected; may be left floating or tied to V+, V−, or ground per layout best practice-no functional impact. |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | 10 pA typical input bias current enables direct interfacing with high-impedance sources (e.g., pH electrodes, photodiodes) without signal degradation. |
| Laser-trimmed input offset | ±1.5 mV max offset voltage ensures minimal DC error in closed-loop configurations like precision integrators and voltage-to-current converters. |
| Offset trim pins (1 & 5) | Allows field calibration of input offset without modifying external feedback; preserves temperature drift performance when used per datasheet guidance. |
| Wide supply range (±10V to ±45V) | Eliminates need for external charge pumps or rail splitters in high-voltage analog front-ends such as piezo driver stages and HV power supply error amplifiers. |
| SO-8 PowerPAD compatibility | Pin-compatible with standard SO-8 footprints; thermal pad soldering reduces θJA to 52°C/W (with heat-spreader), enabling higher sustained output current. |
Applications
| Test Equipment | High-Voltage Regulators |
|---|---|
Use Scenario: Precision DC voltage source in automated test systems generating calibrated ±35V compliance ranges. IC Role / Device Role / Timing Role: Acts as error amplifier in series-pass regulator topology, comparing reference voltage against scaled output via resistive divider. Use Value: 15V/µs slew rate ensures fast transient recovery (<2.5 µs step response), while ±15 mA output directly drives pass transistor base/gate without buffer stages. | Use Scenario: Feedback control loop in programmable lab power supplies delivering 0–60V at 10 mA. IC Role / Device Role / Timing Role: Serves as high-common-mode differential amplifier sensing output voltage across floating load with ±45V isolation capability. Use Value: ±80V differential input rating and ±45V supply tolerance allow direct sensing without attenuators or isolators, reducing component count and noise. |
| Piezo Drivers | Data Acquisition Front-Ends |
Use Scenario: Bipolar drive for piezoelectric actuators requiring ±45V swing and nanosecond-scale settling. IC Role / Device Role / Timing Role: Configured as non-inverting amplifier with gain ≥10 to boost DAC output (e.g., DAC8811) into ±45V range. Use Value: 15V/µs slew rate supports <100 ns rise time for 200 mV steps, enabling precise positioning in scanning probe microscopy and inkjet printheads. | Use Scenario: Signal conditioning stage before SAR ADC in industrial process monitoring systems measuring thermocouple or strain gauge outputs. IC Role / Device Role / Timing Role: Low-noise, high-Z buffer and programmable-gain amplifier with 15 nV/√Hz input voltage noise density at 1 kHz. Use Value: 1014 Ω || 3 pF input impedance prevents loading of high-source-impedance sensors, maintaining signal integrity without guard traces or active guarding. |
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 |
|---|---|---|---|
| OPA445AU | Same silicon die, identical electrical specs; differs only in SOIC packaging (D) and RoHS-compliant NiPdAu lead finish. | Identical functional use; preferred for new designs due to surface-mount compatibility and moisture sensitivity level 3 compliance. | Select OPA445AU for volume production with reflow assembly; OPA445APG4 remains valid for through-hole prototyping or legacy board reuse. |
| OPA454AIDDA | Higher 22 V/µs slew rate, lower 3.5 pA input bias, but reduced ±35V max supply and no offset trim pins. | Better for ultra-low-noise, high-speed applications below ±35V; unsuitable where offset trimming or >±35V rails are required. | Choose OPA445APG4 when offset adjustment, >±35V operation, or proven thermal derating at 150°C/W is mandatory. |
Compared with OPA445AU, OPA445APG4 offers identical performance in a PDIP-8 package suited for breadboarding and thermal testing, while OPA445AIDDA trades offset trim and voltage range for improved speed and input current-making OPA445APG4 the optimal choice for high-voltage, trimmable precision designs.
Availability
OPA445APG4 is available at Aetrix Electronics and suitable for test equipment, high-voltage regulators, and piezo drivers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for OPA445APG4 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 amp design and high-reliability manufacturing.
The OPA445 belongs to TI's High-Voltage Precision Op Amp family, engineered specifically for applications demanding wide supply range, low input bias, and robust thermal performance in industrial and test instrumentation.
FAQ
What is the maximum supply voltage rating for the OPA445APG4?
The OPA445APG4 has an absolute maximum supply voltage rating of ±50V, but its specified operating range is ±10V to ±45V. Operation at ±45V is fully characterized across temperature, delivering 15V/µs slew rate and ±15mA output current. Exceeding ±45V risks permanent damage and voids warranty compliance per TI's SBOS156B datasheet Absolute Maximum Ratings table.
Does the OPA445APG4 require external components for stability with capacitive loads?
Yes-the OPA445APG4 can oscillate when driving >100 pF directly. TI recommends adding a series RC network (e.g., 20 Ω + 0.22 µF) between output and load per Figure 3 in SBOS156B. This preserves phase margin without degrading DC accuracy, unlike simple series resistance which introduces gain error. Layout practices-including short traces and local 0.1 µF bypass caps-are equally critical.
Can the OPA445APG4 be used in single-supply configurations?
Yes-the OPA445APG4 operates with asymmetric supplies (e.g., +80V and −10V) or single-ended rails (e.g., +90V and GND), provided the input common-mode range ((V−)+5 V to (V+)−5 V) and output swing limits are respected. Input protection resistors are mandatory if inputs exceed supply rails, as FET gate isolation diodes may forward-bias and cause latch-up or damage.
How does the offset trim function work on the OPA445APG4?
The OPA445APG4 provides dedicated offset trim pins (1 and 5) that accept a 100 kΩ potentiometer wired between V+ and V−, with the wiper connected to pin 1. Adjusting this potentiometer nulls the amplifier's internal input offset voltage-±1.5 mV max-without affecting system-level offsets or drift performance. TI explicitly warns against using this for system calibration, as it degrades long-term stability.
What thermal management is required for continuous 15 mA output at ±40V?
At ±40V supply and ±15 mA load, OPA445APG4 dissipates ~1.2 W. In its SO-8 package (θJA = 150°C/W), ambient must stay below 48°C to keep junction ≤125°C. TI recommends using ≥4.8 mm × 3.8 mm copper pour with five 13-mil vias under the thermal pad (even though OPA445APG4 lacks PowerPAD), or switching to OPA445ADDA for θJA = 52°C/W with proper PCB layout.
OPA445APG4 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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA445APG4 FAQ
1.How can I place an order for OPA445APG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA445APG4 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 OPA445APG4 reliable?
The price and inventory of OPA445APG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA445APG4 is usually 5 days.
3.What payment methods are accepted for OPA445APG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA445APG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA445APG4?
OPA445APG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA445APG4 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 OPA445APG4?
For technical support, including OPA445APG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA445APG4 requirements.
6.How does Aetrix verify that OPA445APG4 is sourced from the original manufacturer or authorized distributors?
All OPA445APG4 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 OPA445APG4 meets industry standards.
7.What is the process for return or replacement of OPA445APG4?
All OPA445APG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA445APG4, 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 OPA445APG4 part is unused and in its original packaging.
Return procedure for OPA445APG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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