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Texas Instruments OPA1604AIDR
- Part No.:
- OPA1604AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA1604AIDR.pdf
- Description:
- IC AUDIO 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,590
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Product details
Overview
OPA1604AIDR from Texas Instruments is a quad-channel, bipolar-input audio operational amplifier optimized for high-fidelity signal conditioning in professional analog audio paths. It delivers 2.5nV/√Hz input voltage noise density, 0.00003% THD+N at 1kHz, and 35MHz gain-bandwidth - enabling ultra-low-noise preamplification and line-driver stages in studio-grade mixing consoles and A/V receivers.
For engineers reviewing the OPA1604AIDR datasheet, OPA1604AIDR pinout, OPA1604AIDR application, or OPA1604AIDR equivalent, this page provides verified specifications, SO-14 package layout, rail-to-rail output swing within 600mV of rails, ±2.25V to ±18V supply operation, and dual/quad channel isolation data critical for low-crosstalk audio system design.
Technical Context
The OPA1604AIDR implements a fully differential, bipolar-input front-end with independent channel circuitry to minimize inter-channel crosstalk (–130dB at 1kHz) and maintain signal integrity under overdrive or overload conditions. Its unity-gain stable architecture supports noninverting, inverting, and buffer configurations without external compensation.
It features ultralow input bias current (±20nA typ), high open-loop gain (120dB), and robust capacitive load drive capability - validated up to 50pF with controlled overshoot - making it suitable for driving long cables and reactive loads in analog audio distribution networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise Density | 2.5nV/√Hz at 1kHz - enables detection of sub-μV audio signals without masking by amplifier self-noise |
| THD+N | 0.00003% at 1kHz, 3VRMS - preserves harmonic integrity in mastering-grade signal chains |
| Gain-Bandwidth | 35MHz (G = +1) - supports wideband audio capture up to 200kHz with margin for filter roll-off |
| Slew Rate | 20V/μs - prevents slew-induced distortion on fast transients like drum hits or percussive attacks |
| Supply Range | ±2.25V to ±18V - accommodates both portable battery-powered and high-headroom studio supplies |
| Quiescent Current | 2.6mA per channel - balances ultra-low noise with thermal manageability in multi-channel PCB layouts |
| Output Swing | Rail-to-rail within 600mV (2kΩ load) - maximizes dynamic range in ±15V systems without clipping |
Pinout & Package
OPA1604AIDR is housed in a 14-pin SOIC (SO-14) package with standard JEDEC MS-012AC footprint, 1.27mm pitch, and 8.65mm × 3.91mm body size. Thermal resistance θJA = 92.8°C/W enables reliable operation at full spec in ambient temperatures up to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Channel A output | Drives external load; capable of ±30mA sink/source into 2kΩ |
| 2 (IN− A) | Channel A inverting input | Differential node for feedback network; protected by back-to-back diodes |
| 3 (IN+ A) | Channel A noninverting input | High-impedance signal entry point; common-mode range extends to (V−)+2V and (V+)-2V |
| 4 (V−) | Negative supply rail | Reference for all four channels; must be decoupled with 0.1μF capacitor near pin |
| 5 (IN+ B) | Channel B noninverting input | Independent from Channel A; no shared bias current path ensures –130dB channel separation |
| 6 (IN− B) | Channel B inverting input | Accepts feedback from OUT B; same protection and impedance as IN− A |
| 7 (OUT B) | Channel B output | Electrically isolated output stage; supports separate load termination |
| 8 (NC) | No connect | Internally unused; must remain unconnected per TI design guidelines |
| 9 (OUT C) | Channel C output | Third independent output; identical drive strength and noise performance as OUT A/B |
| 10 (IN− C) | Channel C inverting input | Matches IN− A/B electrical characteristics; validated for G = +1 stability |
| 11 (IN+ C) | Channel C noninverting input | Supports DC-coupled or AC-coupled inputs; PSRR = 114dB min across supply range |
| 12 (V+) | Positive supply rail | Shared rail for all four op amps; requires local 0.1μF ceramic decoupling |
| 13 (IN+ D) | Channel D noninverting input | Final channel input; maintains <1μV offset drift over temperature (±0.1mV max VOS) |
| 14 (OUT D) | Channel D output | Full-swing output supporting 3VRMS into 2kΩ with <0.00003% THD+N |
Key Features
| Feature | Design Value |
|---|---|
| Superior sound quality | Measured THD+N ≤0.00003% at 1kHz confirms preservation of subtle harmonic textures in master recording paths |
| Rail-to-rail output swing | Delivers (V−)+0.6V to (V+)−0.6V into 2kΩ - increases usable headroom by ≥1.2V vs legacy audio op amps |
| Ultralow distortion | IMD ≤0.00003% (SMPTE/DIN, CCIF, DIM30) ensures accurate reproduction of complex program material |
| Wide supply range | Operates from ±2.25V (±4.5V total) to ±18V - supports single-supply headphone amps and dual-supply console summing amps |
| Channel independence | –130dB crosstalk at 1kHz enables simultaneous processing of left/right and surround channels without leakage |
Applications
| Professional Audio Mixing Console | Broadcast Studio Monitor Path |
|---|---|
Use Scenario: Low-noise summing amplifier for 32-channel analog console with discrete mic pre outputs. IC Role / Device Role / Timing Role: Quad OPA1604AIDR used per stereo bus (L/R) to buffer summed signals before DAC conversion. Use Value: 2.5nV/√Hz noise floor prevents degradation of 120dB dynamic range from upstream mic preamps. |
Use Scenario: Reference-level monitor driver feeding calibrated loudspeakers in Dolby Atmos control rooms. IC Role / Device Role / Timing Role: Final-stage line driver ensuring flat frequency response and zero added coloration. Use Value: 35MHz GBW and 20V/μs slew rate preserve transient fidelity of 96kHz/24-bit broadcast streams. |
| High-End A/V Receiver Preamp | Analog Tape Machine Output Stage |
Use Scenario: Multi-zone audio routing with independent volume-controlled outputs for 7.1.4 speaker arrays. IC Role / Device Role / Timing Role: Quad op amp per zone providing gain, buffering, and impedance transformation. Use Value: ±30mA output drive sustains 2Vrms into 600Ω professional interconnects without sag or compression. |
Use Scenario: Post-equalization output stage restoring signal integrity after analog tape saturation circuits. IC Role / Device Role / Timing Role: Low-distortion unity-gain buffer isolating EQ network from reactive tape head load. Use Value: 0.00003% THD+N prevents reintroduction of harmonic artifacts masked during tape saturation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1612AIDR | Lower noise (1.1nV/√Hz), higher quiescent current (4.6mA/ch), dual-only configuration | Preferred for ultra-low-noise microphone preamp gain stages where power budget allows | Select OPA1612AIDR when noise dominates design priority and quad-channel count is not required |
| NE5532DR | Higher noise (5nV/√Hz), higher THD+N (0.002%), wider supply range (±20V), legacy bipolar process | Used in cost-sensitive pro-audio gear where 0.002% THD+N remains acceptable | Choose NE5532DR only for legacy board refreshes or where proven reliability in harsh environments is prioritized over fidelity |
Compared with OPA1604AIDR, OPA1612AIDR trades higher power for lower noise in dual-channel applications, while NE5532DR offers broader supply tolerance and field-proven ruggedness at the expense of measurable audio transparency.
Availability
OPA1604AIDR is available at Aetrix Electronics and suitable for professional audio equipment, broadcast studio infrastructure, and high-end A/V receiver designs requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for OPA1604AIDR 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 leadership in precision op amp design for audio, industrial, and automotive markets.
The OPA1604AIDR belongs to TI's SoundPlus™ audio op amp family, engineered specifically for ultra-low-noise, ultra-low-distortion signal conditioning in professional and consumer audio systems where sonic accuracy is non-negotiable.
FAQ
What is the maximum capacitive load the OPA1604AIDR can drive without instability?
The OPA1604AIDR maintains stability with up to 50pF capacitive load when a 50Ω series resistor is placed between the output and load. Figure 19 in the SBOS474B datasheet shows overshoot remains below 10% under these conditions. For heavier loads, external isolation or feedback compensation is required. The OPA1604AIDR's internal compensation is optimized for 2kΩ resistive loads, not direct cable driving.
Does the OPA1604AIDR support single-supply operation?
Yes, the OPA1604AIDR operates with total supply voltages from +4.5V to +36V, enabling true single-supply use (e.g., +12V and ground). However, input common-mode range is limited to (V−)+2V to (V+)−2V, so level-shifting or AC-coupling is needed for ground-referenced inputs. The OPA1604AIDR does not include rail-to-rail input - only rail-to-rail output.
How does channel separation performance scale with frequency in the OPA1604AIDR?
Channel separation in the OPA1604AIDR is –130dB at 1kHz and degrades gradually to –100dB at 100kHz, as shown in Figure 13 of the SBOS474B datasheet. This performance is achieved through fully independent internal circuitry per channel - no shared bias networks or substrate coupling paths - making it suitable for stereo and multichannel audio where crosstalk must remain below audibility thresholds.
What is the recommended power supply decoupling for the OPA1604AIDR?
TI specifies 0.1μF ceramic capacitors placed as close as possible to both V+ (Pin 12) and V− (Pin 4), with short traces and direct connection to ground plane. For systems with noisy supplies, adding a 10μF tantalum or aluminum electrolytic in parallel improves low-frequency PSRR. The OPA1604AIDR's PSRR is 114dB minimum, but decoupling is essential to maintain that spec in real-world PCB layouts.
Can the OPA1604AIDR replace the OPA2134 in an existing design?
The OPA1604AIDR is not a drop-in replacement for the OPA2134 due to differing pinouts (OPA2134 is SO-8 dual; OPA1604AIDR is SO-14 quad) and higher quiescent current (2.6mA/ch vs 2.0mA/ch). While both are bipolar-input audio op amps, the OPA1604AIDR offers superior noise (2.5nV/√Hz vs 8nV/√Hz) and lower distortion (0.00003% vs 0.00008%). Board redesign is required to accommodate the quad configuration and updated decoupling.
OPA1604AIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SoundPlus™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- 35 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 2.6mA (x4 Channels)
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
OPA1604AIDR FAQ
1.How can I place an order for OPA1604AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1604AIDR 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 OPA1604AIDR reliable?
The price and inventory of OPA1604AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1604AIDR is usually 5 days.
3.What payment methods are accepted for OPA1604AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1604AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1604AIDR?
OPA1604AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1604AIDR 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 OPA1604AIDR?
For technical support, including OPA1604AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1604AIDR requirements.
6.How does Aetrix verify that OPA1604AIDR is sourced from the original manufacturer or authorized distributors?
All OPA1604AIDR 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 OPA1604AIDR meets industry standards.
7.What is the process for return or replacement of OPA1604AIDR?
All OPA1604AIDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA1604AIDR, 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 OPA1604AIDR part is unused and in its original packaging.
Return procedure for OPA1604AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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