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Texas Instruments OPA604AU/2K5G4
- Part No.:
- OPA604AU/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA604AU/2K5G4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,573
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Product details
Overview
OPA604AU/2K5G4 from Texas Instruments is a FET-input, unity-gain stable operational amplifier optimized for high-fidelity audio and precision 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 low-distortion I/V conversion in PCM DAC stages and active filter design.
For engineers reviewing the OPA604AU/2K5G4 datasheet, OPA604AU/2K5G4 pinout, OPA604AU/2K5G4 application, or OPA604AU/2K5G4 equivalent, key selection criteria include its laser-trimmed ±5mV input offset voltage, ±24V supply range, 20MHz gain-bandwidth product, and SOIC-8 package compatibility with high-impedance transducer amplification and spectral analysis front-ends.
Technical Context
The OPA604AU/2K5G4 employs a fully FET-based signal path - including P-channel JFET input transistors, cascoded JFET loads, and a JFET phase-splitter output stage - to achieve symmetrical ±25V/µs slew rate and ultra-low 50pA input bias current. Its patented distortion-reduction circuitry linearizes open-loop response and supports unity-gain stability without external compensation.
Designed for dynamic fidelity, it features 800µA input-stage quiescent current for high transconductance and reduced voltage noise, combined with laser trimming of stage currents and symmetry-critical nodes to minimize harmonic asymmetry. The topology avoids bipolar devices in signal-critical paths, preserving even-order harmonic dominance preferred in professional audio applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| THD+N @ 1kHz | 0.0003% - Enables audibly transparent amplification in 20-bit DAC I/V stages without measurable harmonic contamination. |
| Input Voltage Noise | 10nV/√Hz @ 10kHz - Ensures minimal added noise when amplifying low-level signals from piezoelectric transducers or microphone preamps. |
| Slew Rate | 25V/µs - Supports full-swing transient fidelity up to 200kHz at ±12V output into 600Ω, critical for wideband active filters and data acquisition. |
| Gain-Bandwidth Product | 20MHz - Allows stable closed-loop gains ≥10 with >2MHz small-signal bandwidth, suitable for anti-aliasing and reconstruction filters. |
| Input Bias Current | 50pA - Permits use with source impedances >1MΩ (e.g., ceramic transducers) without significant DC error or Johnson noise degradation. |
| Supply Voltage Range | ±4.5V to ±24V - Enables flexible rail selection across line-powered audio gear (±15V) and battery-operated instrumentation (±5V). |
| Output Drive | ±12V into 600Ω - Delivers 24VPP swing at full load, meeting professional audio interconnect standards without external buffering. |
Pinout & Package
OPA604AU/2K5G4 is housed in an 8-pin SOIC (D) package with 1.27mm pitch, 3.9mm width, and 1.75mm max height - compatible with standard surface-mount assembly and IPC-7351 land patterns. Thermal resistance θJA is 90°C/W when soldered to a PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim (–) | Connects to wiper of external 100kΩ potentiometer for fine adjustment of input offset voltage; unused in most applications due to laser trimming. |
| 2 | Inverting Input (–) | Differential input node accepting feedback network; high-impedance FET input minimizes loading on high-Z sources. |
| 3 | Non-Inverting Input (+) | Reference input for single-ended or differential configurations; common-mode range extends to ±13V with ±15V supplies. |
| 4 | Negative Supply (–VS) | Ground reference for negative rail; requires local 1µF tantalum decoupling to suppress PSRR degradation above 10kHz. |
| 5 | Offset Trim (+) | Connects to +VS side of trim potentiometer; forms adjustable voltage divider with Pin 1 for offset nulling. |
| 6 | Output (VO) | Class-AB output stage capable of ±35mA continuous drive into 600Ω; short-circuit protected to ±40mA. |
| 7 | Positive Supply (+VS) | Power input for positive rail; decoupling capacitor must be placed within 5mm of pin to maintain stability with capacitive loads. |
| 8 | No Internal Connection | Unused terminal; electrically isolated from die - no routing or connection required on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| FET-input architecture | Eliminates bipolar input-stage odd-harmonic generation, yielding predominantly even-order distortion perceived as musically natural. |
| Laser-trimmed offset voltage | ±5mV max eliminates need for AC-coupling capacitors in multi-stage analog chains, preserving low-frequency response. |
| Unity-gain stable design | Operates reliably at G = 1 without external compensation, simplifying buffer and I/V converter implementations. |
| High slew rate symmetry | ±25V/µs ensures equal rise/fall fidelity for square-wave and transient-rich audio signals without waveform asymmetry. |
| 600Ω load drive capability | Meets broadcast-grade line-driving requirements without external emitter followers, reducing component count and board space. |
Applications
| Professional Audio Equipment | PCM DAC I/V Converters |
|---|---|
Use Scenario: High-end headphone amplifiers and studio monitor controllers requiring vanishingly low THD+N and wide dynamic range. IC Role / Device Role / Timing Role: Output buffer and gain stage in discrete op-amp-based headphone drivers, handling ±12V swing into 32Ω loads via parallel configuration. Use Value: 0.0003% THD+N preserves micro-dynamic detail in mastering playback; 10nV/√Hz noise floor prevents hiss masking quiet passages. | Use Scenario: Current-to-voltage conversion after 20-bit PCM63 DAC, feeding active low-pass reconstruction filters. IC Role / Device Role / Timing Role: Precision I/V converter with G = 1 configuration, converting DAC output current to analog voltage while maintaining monotonicity. Use Value: 50pA input bias current prevents DC error accumulation across 1MΩ feedback resistors; 20MHz GBW supports 40kHz filter cutoffs. |
| Spectral Analysis Equipment | Transducer Amplifiers |
Use Scenario: Front-end amplification in FFT-based vibration analyzers capturing mechanical resonance signatures from accelerometers. IC Role / Device Role / Timing Role: Low-noise, high-Z preamplifier stage preceding anti-aliasing filtering and ADC sampling at 100kS/s. Use Value: 10nV/√Hz input noise enables detection of sub-µV signals from piezoelectric sensors; ±24V rails support 20VPP input headroom. | Use Scenario: Signal conditioning for high-impedance ceramic or PVDF ultrasonic transducers in NDT equipment. IC Role / Device Role / Timing Role: Charge amplifier configured with feedback capacitor, leveraging ultra-low input bias current to prevent signal decay. Use Value: 50pA bias current extends usable time constant beyond 10 seconds with 1nF feedback caps; FET input avoids charge injection artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET-input, low-distortion operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2134PA | Lower slew rate (20V/µs), higher input noise (8nV/√Hz @ 1kHz), ±18V max supply | Better suited for DC-coupled instrumentation where ultra-low 1/f noise dominates; less ideal for wideband audio transients | Select OPA2134PA when 1/f noise below 10Hz is critical and slew-induced distortion is not limiting. |
| AD797ARZ | Bipolar input (2nV/√Hz), higher THD+N (0.0002% but odd-harmonic dominant), ±16V max supply | Superior voltage noise for low-Z sources (<1kΩ); unsuitable for high-Z transducer interfaces due to 500nA input bias | Choose AD797ARZ only for low-impedance sensor front-ends where voltage noise outweighs distortion character. |
Compared with OPA2134PA and AD797ARZ, the OPA604AU/2K5G4 uniquely balances ultra-low THD+N, FET-input impedance, and 25V/µs slew symmetry - making it the preferred choice for high-Z, wideband audio and measurement signal chains where even-order harmonic profile and transient fidelity are non-negotiable.
Availability
OPA604AU/2K5G4 is available at Aetrix Electronics and suitable for professional audio equipment, PCM DAC I/V converters, spectral analysis equipment, active filters, and transducer amplifiers requiring stable component supply across extended production lifecycles.
Supply support for OPA604AU/2K5G4 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 over 50 years of innovation in precision amplifiers and signal chain solutions.
The OPA604AU/2K5G4 belongs to TI's OPA-series high-performance audio op amps, engineered specifically for applications demanding ultra-low distortion, wide bandwidth, and FET-input integrity in professional audio and precision instrumentation.
FAQ
What is the maximum supply voltage rating for the OPA604AU/2K5G4?
The OPA604AU/2K5G4 has an absolute maximum supply voltage rating of ±25V, with specified operation from ±4.5V to ±24V. Operating at ±24V enables full ±12V output swing into 600Ω loads, while lower rails like ±5V reduce power dissipation for portable spectral analysis modules. Exceeding ±25V risks permanent damage to internal junctions per TI's Absolute Maximum Ratings table.
Does the OPA604AU/2K5G4 require external offset nulling in typical applications?
No, the OPA604AU/2K5G4 does not require external offset nulling in typical applications because its input offset voltage is laser-trimmed to ±5mV maximum at +25°C. 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 simplifies layout - especially in multi-stage audio circuits where coupling capacitors are undesirable.
Can the OPA604AU/2K5G4 drive capacitive loads without oscillation?
The OPA604AU/2K5G4 can drive moderate capacitive loads (≤100pF) stably in unity-gain configuration, but larger loads (e.g., 5000pF) require external phase-lead compensation networks as shown in TI's Figure 3. Without compensation, capacitive loading reduces phase margin and may cause peaking or oscillation due to pole formation with the op amp's 25Ω open-loop output resistance. Verified RC/CC networks from the datasheet ensure stability while preserving bandwidth.
How does the OPA604AU/2K5G4 compare to bipolar-input op amps in transducer amplifier applications?
The OPA604AU/2K5G4 outperforms bipolar-input op amps in transducer amplifier applications due to its 50pA input bias current - roughly 3000× lower than typical bipolar audio op amps - which prevents DC error and Johnson noise degradation when interfacing with high-impedance piezoelectric or ceramic transducers. Its FET input also avoids charge injection artifacts during switching, preserving signal integrity in pulsed NDT systems.
Is the OPA604AU/2K5G4 pin-compatible with other SOIC-8 op amps?
The OPA604AU/2K5G4 uses standard SOIC-8 pinout (D package) matching industry conventions for dual-supply op amps: Pin 4 = –VS, Pin 7 = +VS, Pin 2 = –IN, Pin 3 = +IN, Pin 6 = OUT. However, Pin 1 and Pin 5 are dedicated to offset trim and Pin 8 is NC - unlike many general-purpose op amps where those pins may be unused or repurposed. Direct substitution requires verifying trim pin handling and NC pin clearance in existing layouts.
OPA604AU/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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/2K5G4 FAQ
1.How can I place an order for OPA604AU/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA604AU/2K5G4 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/2K5G4 reliable?
The price and inventory of OPA604AU/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA604AU/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA604AU/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA604AU/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA604AU/2K5G4?
OPA604AU/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA604AU/2K5G4 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/2K5G4?
For technical support, including OPA604AU/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA604AU/2K5G4 requirements.
6.How does Aetrix verify that OPA604AU/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA604AU/2K5G4 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/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA604AU/2K5G4?
All OPA604AU/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA604AU/2K5G4, 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/2K5G4 part is unused and in its original packaging.
Return procedure for OPA604AU/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA604AU/2K5G4 Tags
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