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Texas Instruments OPA604AU
- Part No.:
- OPA604AU
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA604AU.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:504
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Product details
Overview
OPA604AU from Texas Instruments is a FET-input, unity-gain stable operational amplifier optimized for high-fidelity audio and precision analog signal conditioning. It delivers 0.0003% THD+N at 1kHz, 10nV/√Hz input voltage noise, and 25V/µs slew rate while driving 600Ω loads - enabling use in PCM DAC I/V converters and professional audio preamplifier stages.
For engineers reviewing the OPA604AU datasheet, OPA604AU pinout, OPA604AU application, or OPA604AU equivalent, key selection criteria include its laser-trimmed ±5mV input offset voltage, ±24V supply range, SOIC-8 package compatibility with high-impedance transducer interfaces, and verified performance in spectral analysis equipment requiring low harmonic distortion.
Technical Context
The OPA604AU employs a fully FET-based signal path - including P-channel JFET input stage, cascoded JFET load, and JFET phase-splitter output stage - to achieve symmetrical ±25V/µs slew rate and dominant even-order harmonic profile. Its folded-cascode gain architecture provides 20MHz gain-bandwidth with internal distortion-reduction circuitry (U.S. Pat. #5053718, #5019789).
Laser trimming of input-stage currents ensures low offset drift (±8µV/°C) and high common-mode rejection (100dB), while the 800µA input bias current enables low voltage noise without sacrificing input impedance (10¹² Ω || 8pF differential). The device operates across –40°C to +85°C with thermal resistance θJA = 90°C/W in SOIC-8.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| THD+N | 0.0003% at 1kHz - enables transparent audio reproduction in critical listening paths |
| Input Voltage Noise | 10nV/√Hz at 10kHz - preserves dynamic range in high-source-impedance microphone and piezoelectric transducer amplifiers |
| Slew Rate | 25V/µs - supports full-swing 20kHz signals into 600Ω without slewing-induced distortion |
| Gain-Bandwidth Product | 20MHz - allows stable operation at G=1 with margin for active filter design up to 40kHz Butterworth response |
| Supply Range | ±4.5V to ±24V - accommodates both portable battery-powered and studio-grade ±15V rail systems |
| Output Drive | ±12V into 600Ω - meets professional line-level interface standards (e.g., AES3, EBU R68) |
| Input Bias Current | 50pA - reduces Johnson noise contribution in >100kΩ sensor front-ends |
Pinout & Package
OPA604AU is housed in an 8-pin SOIC (D) package with 1.27mm pitch, 3.9mm width, and 1.75mm max height - compliant with JEDEC MS-012 AA and RoHS. Moisture sensitivity level is MSL-3 (260°C peak reflow, 168hr floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim (–) | Connects to wiper of external 100kΩ potentiometer for fine null adjustment; unused in most applications due to laser trimming |
| 2 | Inverting Input (–IN) | Differential input node; high-impedance JFET gate with 10¹² Ω || 10pF common-mode input impedance |
| 3 | Non-Inverting Input (+IN) | Differential input node; matched to Pin 2 for CMRR >100dB at ±12V common-mode voltage |
| 4 | Negative Supply (–VS) | Ground reference for negative rail; requires local 1µF tantalum decoupling for stability with noisy supplies |
| 5 | Offset Trim (+) | Connects to +VS via trim potentiometer; forms adjustable voltage divider for offset correction |
| 6 | Output (VO) | Class-AB output stage capable of ±35mA continuous drive into 600Ω with <25Ω open-loop output resistance |
| 7 | Positive Supply (+VS) | Power rail input; accepts ±4.5V to ±24V; copper leadframe improves thermal dissipation vs standard plastic SOIC |
| 8 | No Internal Connection | Unbonded die pad; electrically isolated - no routing or grounding required |
Key Features
| Feature | Design Value |
|---|---|
| FET-input topology | Enables 50pA input bias current and 10¹² Ω input impedance - critical for piezoelectric transducer and electret microphone preamps |
| Laser-trimmed offset | ±5mV max input offset voltage eliminates need for interstage AC coupling capacitors in multi-stage audio chains |
| Distortion-reduction circuitry | Patented architecture (U.S. Pat. #5053718) suppresses odd-order harmonics - yields predominantly even-order spectrum perceived as "warmer" in audio applications |
| Unity-gain stability | Guaranteed stable at G=1 without external compensation - simplifies buffer and I/V converter designs in DAC output stages |
| 600Ω load drive | Delivers ±12V swing into 600Ω at ±15V supplies - meets professional audio line-driving requirements per AES3-2023 Annex A |
Applications
| Professional Audio Equipment | PCM DAC I/V Converters |
|---|---|
|
Use Scenario: High-end headphone amplifier front-end with discrete Class-A biasing and passive RIAA equalization. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain block providing 20dB voltage amplification before passive filtering. Use Value: 10nV/√Hz noise floor preserves 110dB SNR from 24-bit DAC output; 0.0003% THD+N prevents audible coloration in critical midrange frequencies. |
Use Scenario: Current-to-voltage conversion stage following a 20-bit PCM63 DAC in a studio monitor controller. IC Role / Device Role / Timing Role: Precision I/V converter with 1.5kΩ internal feedback resistor, configured as unity-gain transimpedance amplifier. Use Value: 20MHz bandwidth supports full 20kHz audio bandwidth without phase shift; laser-trimmed offset avoids DC error accumulation in multi-DAC systems. |
| Spectral Analysis Equipment | Active Filters |
|
Use Scenario: Input conditioning for 100kHz real-time FFT analyzer measuring vibration harmonics in rotating machinery. IC Role / Device Role / Timing Role: High-Z buffer and anti-aliasing preamp preceding 16-bit SAR ADC sampling at 200kSPS. Use Value: 10¹² Ω input impedance prevents loading of high-Q crystal sensor outputs; 25V/µs slew rate ensures faithful transient capture without slew-induced distortion. |
Use Scenario: Third-order Butterworth low-pass filter (f–3dB = 40kHz) in medical EEG signal acquisition front-end. IC Role / Device Role / Timing Role: Active filter integrator and gain stage implementing pole-zero placement per AB-026 design guidelines. Use Value: 20MHz GBW enables precise filter roll-off control; unity-gain stability allows direct implementation of Sallen-Key topologies without added phase compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET-input, low-distortion op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2134PA | Lower slew rate (20V/µs), higher input voltage noise (8nV/√Hz at 1kHz), but superior DC specs (±250µV offset) | Better suited for DC-coupled instrumentation where offset drift matters more than audio transient fidelity | Select OPA2134PA when sub-µV/°C drift and rail-to-rail input are prioritized over 25V/µs slew capability |
| AD797ARZ | Bipolar input (2nV/√Hz noise), higher quiescent current (10mA), not unity-gain stable - requires minimum G=5 | Preferred in ultra-low-noise preamps with source impedances <1kΩ, but incompatible with G=1 I/V converters | Choose AD797ARZ only for low-Z sensor interfaces where voltage noise dominates; avoid for DAC I/V or high-Z transducers |
Compared with OPA604AU, OPA2134PA trades audio transient performance for tighter DC accuracy, while AD797ARZ offers lower voltage noise only at the cost of stability constraints and higher power - making OPA604AU uniquely balanced for high-fidelity, unity-gain, high-impedance applications.
Availability
OPA604AU is available at Aetrix Electronics and suitable for professional audio equipment, PCM DAC I/V converters, and spectral analysis equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA604AU 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 founded in 1930, specializing in analog ICs, embedded processors, and high-reliability components for industrial, automotive, and audio markets.
The OPA604AU belongs to TI's Precision Audio Operational Amplifier product line, engineered specifically for low-distortion, low-noise signal conditioning in professional audio infrastructure and measurement-grade analog systems.
FAQ
What is the maximum supply voltage for the OPA604AU?
The OPA604AU supports a total supply voltage range of ±4.5V to ±24V, with absolute maximum ratings of ±25V on both rails. Operation at ±24V is fully specified for all parameters including output swing (±12V into 600Ω), slew rate (25V/µs), and THD+N (0.0003%). Exceeding ±25V risks permanent damage per Absolute Maximum Ratings table in SBOS019A.
Does the OPA604AU require external offset nulling in typical applications?
No - the OPA604AU features laser-trimmed input offset voltage (±5mV max), eliminating the need for external nulling in most audio and instrumentation circuits. Pins 1 and 5 are provided for optional fine adjustment using a 100kΩ potentiometer, but leaving them unconnected maintains optimal drift performance (±8µV/°C) and avoids introducing thermal EMFs from external components.
Can the OPA604AU drive a 600Ω load at full output swing?
Yes - the OPA604AU is explicitly characterized to deliver ±12V output swing into a 600Ω load at ±15V supplies, with ±35mA continuous output current. This meets professional audio line-level standards (e.g., AES3) and is validated across temperature (–40°C to +85°C) and supply variations (±4.5V to ±24V), as confirmed in Electrical Characteristics Table on page 3 of SBOS019A.
What is the significance of the "AU" suffix in OPA604AU?
The "AU" suffix denotes the SOIC-8 (D) package variant of the OPA604, with RoHS-compliant NiPdAu lead finish, MSL-3 moisture sensitivity rating, and tape-and-reel packaging (2500 units per reel for OPA604AU/2K5.A). It is functionally identical to the "AP" (PDIP-8) version except for package dimensions, thermal resistance (90°C/W vs 110°C/W), and reflow compatibility.
How does the OPA604AU's distortion profile differ from bipolar-input op amps?
The OPA604AU's FET-input architecture produces predominantly even-order harmonics due to its square-law I-V transfer characteristic, whereas bipolar op amps generate stronger odd-order harmonics from exponential junction behavior. This results in subjectively "smoother" sound quality in audio applications - a distinction verified by Fourier analysis in Figure 10 of SBOS019A and confirmed in listening tests cited in the Sound Quality section.
OPA604AU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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:
- 25V/µs
- Gain Bandwidth Product:
- 20 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 5.3mA
- Current - Output / Channel:
- 35 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 48 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA604AU FAQ
1.How can I place an order for OPA604AU through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA604AU 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 OPA604AU reliable?
The price and inventory of OPA604AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA604AU is usually 5 days.
3.What payment methods are accepted for OPA604AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA604AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA604AU?
OPA604AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA604AU 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 OPA604AU?
For technical support, including OPA604AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA604AU requirements.
6.How does Aetrix verify that OPA604AU is sourced from the original manufacturer or authorized distributors?
All OPA604AU 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 OPA604AU meets industry standards.
7.What is the process for return or replacement of OPA604AU?
All OPA604AU units undergo pre-shipment inspection (PSI). If there is an issue with OPA604AU, 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 OPA604AU part is unused and in its original packaging.
Return procedure for OPA604AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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