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Texas Instruments OPA602AU
- Part No.:
- OPA602AU
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA602AU.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:259
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Product details
Overview
OPA602AU from Texas Instruments is a high-speed precision Difet® operational amplifier optimized for low-input-bias-current, wide-bandwidth signal conditioning in instrumentation and data conversion systems. It delivers 6.5MHz gain bandwidth, 35V/µs slew rate, ±3000µV max input offset voltage, and 1pA max input bias current at +25°C - enabling accurate pulse amplification and fast settling (1µs to 0.01%) in ultrasound front-ends and professional audio circuits.
For engineers reviewing the OPA602AU datasheet, OPA602AU pinout, OPA602AU application, or OPA602AU equivalent, this page provides verified package mapping (SO-8), confirmed pin functions, real-world design meaning of key specs, and two validated alternative op amps with documented functional trade-offs for precision high-speed analog signal paths.
Technical Context
The OPA602AU uses monolithic dielectrically isolated FET (Difet®) construction to simultaneously achieve high speed and precision - maintaining sub-picoampere input bias current across its full ±10.2V common-mode range via cascode input circuitry. Its unity-gain stability and 1500pF capacitive load drive capability simplify layout in sensitive transducer interfaces.
Input offset is laser-trimmed for ±3000µV max (U-package), while voltage noise remains low (13nV/√Hz at 1kHz) and current noise ultra-low (0.6fA/√Hz), making it suitable for high-impedance sensor buffering where both speed and DC accuracy are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 6.5MHz - supports stable closed-loop operation up to ~65kHz at gain=100 without phase margin erosion. |
| Slew Rate | 35V/µs - enables faithful reproduction of 10V-step signals within <1µs, critical for data acquisition front-ends. |
| Input Offset Voltage | ±3000µV max (25°C, SO-8) - sets baseline DC error floor in precision gain stages; drift ±15µV/°C over temperature. |
| Input Bias Current | ±1pA max (25°C) - allows direct connection to >1GΩ source impedances without significant error (e.g., piezoelectric sensors). |
| Settling Time | 1.0µs to 0.01% - ensures accurate digitization of transient pulses in ultrasound and sonar echo processing. |
| Supply Voltage Range | ±5V to ±18V - accommodates industrial ±12V and test equipment ±15V rails while maintaining specified performance. |
| Capacitive Load Drive | 1500pF - eliminates need for isolation resistors when driving ADC input capacitance or long cables. |
Pinout & Package
OPA602AU is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package per JEDEC MS-012, with 1.27mm lead pitch and RoHS-compliant CU NIPDAU finish (MSL Level-3, 260°C peak reflow). The package supports surface-mount assembly and thermal dissipation up to 1000mW at junction temperatures ≤+175°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim (–) | Connects to external trim potentiometer wiper; used with Pin 8 to null input offset voltage (±10mV typical adjustment range). |
| 2 | Inverting Input (–In) | High-impedance FET input node; requires guarding on PCB to prevent leakage currents exceeding 1pA. |
| 3 | Noninverting Input (+In) | High-impedance FET input node; common-mode range extends to ±10.2V with ±15V supplies. |
| 4 | –VS | Negative supply rail connection; must be bypassed with 0.1µF ceramic capacitor near pin for stability. |
| 5 | NC | No internal connection; left unconnected per TI datasheet - not usable as guard or feedback node. |
| 6 | Output | Class-A/B output stage capable of ±11.5V swing into 1kΩ and ±20mA continuous output current. |
| 7 | +VS | Positive supply rail connection; same bypassing requirement as Pin 4 for high-frequency PSRR integrity. |
| 8 | Offset Trim (+) | Connects to external trim potentiometer end; forms adjustable voltage divider with Pin 1 for offset calibration. |
Key Features
| Feature | Design Value |
|---|---|
| Difet® input architecture | Combines 1pA max input bias current with 13nV/√Hz voltage noise - rare for >6MHz op amps, enabling high-Z sensor interfacing without noise penalty. |
| Unity-gain stable | Operates stably at gain = +1 without external compensation, simplifying design in buffer and active filter configurations. |
| Cascode input circuitry | Maintains low input bias current and stable CMRR (>88dB) across full ±10.2V input common-mode range - essential for differential signal conditioning. |
| Laser-trimmed offset | ±3000µV max offset (SO-8) with ±15µV/°C drift - matches bipolar op amp DC precision while retaining FET input advantages. |
| 1500pF capacitive load drive | Eliminates need for series output resistance in ADC driver applications, preserving bandwidth and settling fidelity. |
Applications
| Ultrasound Imaging Front-End | Professional Audio Line Driver |
|---|---|
|
Use Scenario: Amplifying weak, high-frequency echo signals from piezoelectric transducers before ADC sampling. IC Role / Device Role / Timing Role: Low-noise, fast-settling transimpedance and gain stage with minimal added distortion. Use Value: 13nV/√Hz input voltage noise and 1µs settling to 0.01% preserve signal fidelity in 1–15MHz medical imaging bands. |
Use Scenario: Driving balanced line outputs in studio mixing consoles and digital audio workstations. IC Role / Device Role / Timing Role: Unity-gain stable voltage follower with low THD+N (<0.001% at 1kHz) and wide bandwidth. Use Value: 6.5MHz GBW and 35V/µs slew rate support clean reproduction of 20kHz audio harmonics without slewing distortion. |
| Precision Data Acquisition Channel | Medical Patient Monitoring Sensor Interface |
|
Use Scenario: Conditioning analog outputs from strain gauges, thermocouples, or RTDs prior to sigma-delta ADC conversion. IC Role / Device Role / Timing Role: Precision instrumentation amplifier input stage with ultra-low input bias current. Use Value: ±1pA max input bias current prevents voltage errors across high-resistance sensor bridges (>10kΩ), ensuring µV-level accuracy. |
Use Scenario: Buffering low-current biosignals (e.g., ECG, EEG) with high source impedance and strict DC stability requirements. IC Role / Device Role / Timing Role: High-CMRR, low-drift DC-coupled amplifier for biopotential signal chain front-end. Use Value: ±3000µV max offset and ±15µV/°C drift minimize baseline wander; 10¹⁴Ω || 3pF input impedance prevents signal attenuation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA627AU | Higher precision: ±25µV max offset, 1.9MHz GBW, 2.5V/µs slew rate - trades speed for ultra-low DC error. | Better for DC-critical applications (e.g., precision weigh scales); unsuitable for >1MHz pulse amplification. | Select OPA627AU only if offset drift and long-term stability outweigh bandwidth needs. |
| ADA4898-1ARZ | Lower noise: 1nV/√Hz at 1kHz, 290MHz GBW, but ±2.5µA input bias current - incompatible with >1MΩ sources. | Preferred for low-noise, high-speed ADC drivers with low-Z sources; cannot replace OPA602AU in piezoelectric sensor buffers. | Choose ADA4898-1ARZ when driving low-impedance loads at >10MHz, not for high-Z, low-current applications. |
Compared with OPA602AU, OPA627AU sacrifices bandwidth for microvolt-level DC accuracy, while ADA4898-1ARZ delivers superior noise and speed but requires low-source-impedance operation - neither is pin-compatible, and both demand layout and stability reassessment in existing designs.
Availability
OPA602AU is available at Aetrix Electronics and suitable for precision instrumentation, medical equipment, and professional audio applications requiring stable component supply, consistent SOIC packaging, and long-term industrial lifecycle support.
Supply support for OPA602AU 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 innovation.
The OPA602AU belongs to TI's legacy Difet® precision op amp family, engineered specifically for applications demanding simultaneous high speed, ultra-low input bias current, and DC accuracy - such as ultrasound, data conversion, and medical diagnostics.
FAQ
What is the maximum capacitive load the OPA602AU can drive while remaining stable?
The OPA602AU is specified to drive up to 1500pF capacitive load in unity-gain configuration without external compensation. This capability is verified in the datasheet under "Load Capacitance Stability" and enables direct connection to ADC inputs or coaxial cables without series isolation resistors - a key advantage over many high-speed op amps that require ≥100Ω output resistance for stability.
Does the OPA602AU require external offset trim in all applications?
No - the OPA602AU has a maximum input offset voltage of ±3000µV at +25°C, which may be acceptable for many gain-of-10 or higher signal chains. However, for DC-critical applications like precision weigh scales or low-gain instrumentation, Pins 1 and 8 support a 100kΩ trim potentiometer to reduce offset to <±100µV. The trim range is ±10mV typical, as shown in Figure 2 of the SBOS155A datasheet.
Is the OPA602AU suitable for single-supply operation?
The OPA602AU is specified for dual-supply operation (±5V to ±18V) and does not support true single-supply use. Its input common-mode range is ±10.2V with ±15V supplies, and output swing is asymmetric near ground (e.g., –13.8V/+12.9V). For single-rail designs, TI recommends alternatives like the OPA350 or OPA167x families - the OPA602AU must be used with split rails to meet datasheet performance.
How does the OPA602AU's input bias current behave over temperature?
The OPA602AU's input bias current increases with temperature: ±20pA max at full operating range (–25°C to +85°C), versus ±1pA max at +25°C. This 20× increase is inherent to FET input devices and must be accounted for in high-impedance circuits - for example, a 1GΩ source will develop up to 20mV of error at +85°C, even if negligible at room temperature.
What is the recommended PCB layout practice for minimizing leakage current effects on the OPA602AU's inputs?
TI explicitly recommends a guard ring around Pins 2 (+In) and 3 (–In), connected to a low-impedance node at the same potential (e.g., output for unity-gain buffer). This guard must be repeated on all PCB layers and isolated from ground planes. Leakage across FR-4 can exceed 1pA - especially with flux residue - so cleaning with deionized water and baking at +85°C for 30 minutes is advised after assembly to restore specified input bias current.
OPA602AU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Difet®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 35V/µs
- Gain Bandwidth Product:
- 6.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 3mA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA602AU FAQ
1.How can I place an order for OPA602AU through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA602AU 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 OPA602AU reliable?
The price and inventory of OPA602AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA602AU is usually 5 days.
3.What payment methods are accepted for OPA602AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA602AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA602AU?
OPA602AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA602AU 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 OPA602AU?
For technical support, including OPA602AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA602AU requirements.
6.How does Aetrix verify that OPA602AU is sourced from the original manufacturer or authorized distributors?
All OPA602AU 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 OPA602AU meets industry standards.
7.What is the process for return or replacement of OPA602AU?
All OPA602AU units undergo pre-shipment inspection (PSI). If there is an issue with OPA602AU, 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 OPA602AU part is unused and in its original packaging.
Return procedure for OPA602AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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