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Texas Instruments OPA604AP
- Part No.:
- OPA604AP
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA604AP.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,848
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Product details
Overview
OPA604AP 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 preamplifiers.
For engineers reviewing the OPA604AP datasheet, OPA604AP pinout, OPA604AP application, or OPA604AP equivalent, key selection criteria include its laser-trimmed ±1mV input offset voltage, ±4.5V to ±24V supply flexibility, 20MHz gain-bandwidth product, and SOIC-8 package compatibility with high-impedance transducer interfaces and low-distortion active filters.
Technical Context
The OPA604AP employs a fully FET-based signal path - including P-channel JFET input stage, cascoded JFET load, and JFET phase-splitter output stage - minimizing odd-order harmonics and enabling superior subjective sound quality. Its folded-cascode architecture achieves symmetrical ±25V/µs slew rate via 800µA input-stage bias current.
Laser trimming of dynamic circuit performance ensures ultra-low distortion (0.0003% THD+N), while patented distortion-reduction circuitry enhances open-loop linearity and voltage gain. The device operates across –25°C to +85°C and supports wide common-mode input range (±13V) and high CMRR (100dB).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| THD+N @ 1kHz | 0.0003% - Enables audibly transparent amplification in high-end audio paths without perceptible harmonic coloration. |
| Input Voltage Noise | 10nV/√Hz @ 10kHz - Supports low-noise amplification of high-impedance sources (e.g., piezoelectric transducers) without current-noise dominance. |
| Slew Rate | 25V/µs - Preserves transient fidelity in fast-slewing audio waveforms and spectral analysis signals up to 20kHz full-scale. |
| Gain-Bandwidth Product | 20MHz - Allows stable closed-loop operation at gains ≥1 with bandwidth sufficient for 20kHz audio and data acquisition systems. |
| Supply Voltage Range | ±4.5V to ±24V - Permits flexible rail selection in both battery-powered portable gear and studio-grade ±15V systems. |
| Output Drive Capability | ±12V into 600Ω - Delivers professional line-level signal integrity without external buffering in DAC output stages. |
| Input Bias Current | 50pA - Reduces voltage error and Johnson noise in high-Z sensor interfaces (e.g., electret mics, pH electrodes). |
Pinout & Package
OPA604AP is packaged in an 8-pin SOIC (SO-8) surface-mount package with 1.27mm pitch, 3.9mm width, and 1.75mm max height - compatible with standard reflow profiles (MSL Level-3, 260°C peak). Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim | Connects to external 100kΩ potentiometer for fine adjustment of input offset voltage; unused in most applications due to laser trimming. |
| 2 | Inverting Input (–) | Differential input node; high-impedance JFET gate accepting signals referenced to common-mode range (±13V). |
| 3 | Non-Inverting Input (+) | Differential input node; identical impedance and voltage range as Pin 2; used for unity-gain buffers and non-inverting configurations. |
| 4 | Negative Supply (–VS) | Connects to negative rail (e.g., –15V); internal ESD protection diodes clamp to this pin. |
| 5 | Offset Trim | Second trim terminal; completes nulling circuit with Pin 1 - required only when precise DC accuracy is needed beyond laser-trim spec. |
| 6 | Output (VO) | Class-AB output stage capable of ±35mA continuous drive into 600Ω with <1.5µs settling to 0.01%. |
| 7 | Positive Supply (+VS) | Connects to positive rail (e.g., +15V); decoupling capacitor (1µF tantalum) recommended adjacent to pin. |
| 8 | No Internal Connection | Unused die pad; electrically isolated - no connection required or recommended. |
Key Features
| Feature | Design Value |
|---|---|
| FET-input architecture | 50pA input bias current enables direct coupling to >1MΩ source impedances without significant DC error or noise degradation. |
| Laser-trimmed offset | ±1mV max input offset voltage eliminates need for interstage AC coupling capacitors in multi-stage audio chains. |
| Unity-gain stability | Operates stably at G = 1 without external compensation - simplifies design of I/V converters and line drivers. |
| High PSRR & CMRR | 100dB power supply and common-mode rejection minimizes ripple and ground noise injection in noisy PCB environments. |
| 600Ω load drive | Delivers ±12V output swing into 600Ω - meets professional audio line-driving standards (e.g., AES3, EBU R68) without external buffers. |
Applications
| Professional Audio Preamp | PCM DAC I/V Converter |
|---|---|
Use Scenario: Low-noise microphone preamplifier stage in broadcast mixing consoles with 100dB+ dynamic range requirements. IC Role / Device Role / Timing Role: Primary gain stage with ultra-low THD+N and high ZIN to preserve signal integrity from condenser mic capsules. Use Value: 0.0003% THD+N and 10nV/√Hz noise ensure no audible degradation across 20Hz–20kHz, even at +24dBu operating levels. |
Use Scenario: Current-to-voltage conversion stage following 20-bit PCM63 DAC in high-resolution digital audio playback systems. IC Role / Device Role / Timing Role: Precision I/V converter with wide bandwidth and low distortion to reconstruct analog waveform without aliasing artifacts. Use Value: 20MHz GBW and 25V/µs slew rate support full-scale 20kHz sine reconstruction with <0.001% differential nonlinearity. |
| Spectral Analysis Front-End | Active Filter for Data Acquisition |
Use Scenario: Input amplifier in FFT-based spectrum analyzers requiring flat frequency response and minimal harmonic generation. IC Role / Device Role / Timing Role: First-stage signal conditioner before anti-aliasing filter and ADC, handling ±10V input ranges. Use Value: ±13V common-mode input range and 100dB CMRR reject ground loop noise during high-resolution 16-bit+ sampling. |
Use Scenario: Third-order low-pass Butterworth filter (f–3dB = 40kHz) in medical ECG data acquisition with >100dB SNR requirement. IC Role / Device Role / Timing Role: Active filter integrator and gain block using OPA604AP in GIC topology per TI AB-026. Use Value: Laser-trimmed offset and low drift (±8µV/°C) maintain filter cutoff accuracy across industrial temperature ranges (–25°C to +85°C). |
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 |
|---|---|---|---|
| OPA2604AU | Dual-channel version in same SOIC-8 package; identical specs per channel but shares thermal mass and supply pins. | Better suited for stereo audio channels or dual-path signal conditioning where layout density matters. | Select OPA2604AU when two matched, low-distortion amps are needed on one die - avoids inter-device matching variance. |
| LM4562MA | Lower input voltage noise (2.7nV/√Hz), higher quiescent current (±5.6mA vs ±5.3mA), and bipolar input (200nA bias current). | Preferred in low-source-impedance (<1kΩ) applications where voltage noise dominates; unsuitable for high-Z transducers. | Choose LM4562MA only when source impedance is <500Ω and absolute lowest voltage noise is critical - not a drop-in replacement for OPA604AP's JFET interface. |
Compared with OPA2604AU, the OPA604AP offers single-channel isolation for critical mono paths; compared with LM4562MA, it provides 4000× lower input bias current essential for piezoelectric and electret sensor front-ends - making OPA604AP uniquely suited for high-Z, low-distortion audio and instrumentation.
Availability
OPA604AP is available at Aetrix Electronics and suitable for professional audio equipment, PCM DAC I/V converters, and spectral analysis equipment requiring stable component supply with guaranteed long-term sourcing.
Supply support for OPA604AP 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 OPA604AP belongs to TI's OPA-series high-performance audio op amps, designed specifically for applications demanding ultra-low distortion, wide bandwidth, and FET-input advantages in professional audio and precision measurement systems.
FAQ
What is the maximum supply voltage for the OPA604AP?
The OPA604AP has an absolute maximum supply voltage rating of ±25V, but its specified operating range is ±4.5V to ±24V. Operation at ±24V is supported with appropriate thermal management - the device's θJA is 90°C/W when soldered to a circuit board. Exceeding ±24V risks permanent damage and voids warranty compliance.
Does the OPA604AP require external offset nulling?
The OPA604AP features laser-trimmed input offset voltage (±1mV max), so external nulling is unnecessary in most applications. Pins 1 and 5 are provided for optional fine adjustment using a 100kΩ potentiometer, but doing so adds ±0.3µV/°C drift per 100µV of adjusted offset - typically degrading long-term stability.
Can the OPA604AP drive a 600Ω load at ±15V supplies?
Yes - the OPA604AP delivers ±12V output swing into 600Ω at ±15V supplies, meeting professional audio line-driving standards. Its output stage sustains ±35mA continuous current and ±40mA short-circuit current, with thermal foldback protecting against sustained overload conditions.
How does the OPA604AP compare to bipolar-input op amps in high-impedance circuits?
In high-impedance circuits (>10kΩ), the OPA604AP's 50pA input bias current prevents significant DC error and Johnson noise rise - unlike bipolar op amps (e.g., LM4562) with ~200nA bias current. This makes OPA604AP superior for piezoelectric transducers, electret microphones, and pH electrode interfaces where bias current directly modulates signal integrity.
Is the OPA604AP unity-gain stable?
Yes - the OPA604AP is explicitly designed for unity-gain stability and requires no external compensation. Its internal compensation ensures phase margin >60° at G = 1, enabling reliable use in voltage followers, I/V converters, and active filters without risk of oscillation under typical PCB parasitics.
OPA604AP 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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA604AP FAQ
1.How can I place an order for OPA604AP through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA604AP 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 OPA604AP reliable?
The price and inventory of OPA604AP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA604AP is usually 5 days.
3.What payment methods are accepted for OPA604AP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA604AP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA604AP?
OPA604AP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA604AP 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 OPA604AP?
For technical support, including OPA604AP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA604AP requirements.
6.How does Aetrix verify that OPA604AP is sourced from the original manufacturer or authorized distributors?
All OPA604AP 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 OPA604AP meets industry standards.
7.What is the process for return or replacement of OPA604AP?
All OPA604AP units undergo pre-shipment inspection (PSI). If there is an issue with OPA604AP, 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 OPA604AP part is unused and in its original packaging.
Return procedure for OPA604AP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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