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Texas Instruments OPA1611AID
- Part No.:
- OPA1611AID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA1611AID.pdf
- Description:
- IC AUDIO 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,714
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Product details
Overview
OPA1611AID from Texas Instruments is a single-channel, bipolar-input audio operational amplifier optimized for high-fidelity preamplifier and line-driver stages. It delivers 1.1 nV/√Hz input voltage noise density, 0.000015% THD+N at 1 kHz, and 27 V/μs slew rate, enabling ultra-low-noise, low-distortion signal conditioning in professional microphone preamps and analog mixing consoles.
For engineers reviewing the OPA1611AID datasheet, OPA1611AID pinout, OPA1611AID application, or OPA1611AID equivalent, this page provides verified specifications, SOIC-8 package details, rail-to-rail output behavior under 2-kΩ load, supply range flexibility (±2.25 V to ±18 V), and validated alternatives for audio signal chain design.
Technical Context
The OPA1611AID employs a precision bipolar input stage with matched transistor pairs to achieve ultralow input offset voltage (±100 μV typ) and drift (1 μV/°C). Its fully differential internal architecture supports unity-gain stability while delivering 40 MHz gain-bandwidth product and 130 dB open-loop gain - critical for maintaining phase integrity in wideband audio feedback loops.
It integrates ESD protection diodes on all pins and features an exposed thermal pad (in SOIC-8 D package) connected to V– for enhanced thermal performance. The output stage drives ±30 mA into 2-kΩ loads while swinging rail-to-rail within 600 mV - preserving dynamic range in ±15 V and ±5 V systems alike.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise Density | 1.1 nV/√Hz at 1 kHz - enables detection of sub-μV audio signals without masking by amplifier noise |
| THD+N | 0.000015% at 1 kHz, G = +1, 3 VRMS - meets professional audio distortion requirements for mastering-grade signal paths |
| Slew Rate | 27 V/μs - supports full-swing transient response up to 200 kHz without slewing-induced distortion |
| Gain-Bandwidth Product | 40 MHz at G = +1 - ensures stable, flat frequency response through 20 kHz with margin for filter roll-off compensation |
| Rail-to-Rail Output Swing | Within 600 mV of rails into 2-kΩ - maximizes usable headroom in ±15 V and ±5 V supplies |
| Quiescent Current | 3.6 mA per channel - balances ultra-low noise performance with power efficiency in battery- or thermally constrained designs |
| Supply Voltage Range | ±2.25 V to ±18 V - supports dual-supply operation from portable 5 V systems to high-voltage studio gear |
Pinout & Package
OPA1611AID is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with an exposed thermal pad on the underside connected internally to V–. Soldering the pad improves thermal resistance (θJA = 150°C/W) and ensures specified noise and distortion performance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - may be left floating or tied to any voltage between V– and V+ |
| 2 | IN– | Inverting input - accepts feedback network for precise gain control and common-mode rejection |
| 3 | IN+ | Noninverting input - high-impedance node (10⁹ Ω || 2 pF) for low-noise sensor or line-level signal injection |
| 4 | V– | Negative supply terminal - also connects to exposed thermal pad; must be low-impedance for noise and thermal stability |
| 5 | NC | No internal connection - electrically isolated; no routing or grounding required |
| 6 | OUT | Amplified output - capable of ±30 mA drive into 2-kΩ, with <600 mV headroom from rails |
| 7 | V+ | Positive supply terminal - supports symmetrical (±15 V) or asymmetrical (e.g., +25 V/–5 V) supply configurations |
| 8 | NC | No internal connection - unused pin; no electrical function or thermal role |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow THD+N | 0.000015% at 1 kHz enables transparent amplification in critical listening paths without harmonic coloration |
| Bipolar Input Stage | 1.1 nV/√Hz noise density and 1.7 pA/√Hz current noise optimize SNR for low-source-impedance microphones and DAC outputs |
| Rail-to-Rail Output | Swings to within 600 mV of V+ and V– into 2-kΩ - preserves >92% of theoretical dynamic range in ±15 V systems |
| Unity-Gain Stable | Operates reliably at G = +1 without external compensation - simplifies layout and reduces component count in buffer applications |
| Wide Supply Range | ±2.25 V to ±18 V allows reuse across 5 V embedded audio and 36 V broadcast equipment without redesign |
Applications
| Microphone Preamplifier | Analog Mixing Console |
|---|---|
Use Scenario: Low-noise amplification of condenser microphone signals (10–200 mV RMS) before ADC conversion in recording interfaces. IC Role / Device Role / Timing Role: Primary gain stage with 40–60 dB programmable gain, operating at G = +100 to +1000. Use Value: 1.1 nV/√Hz input noise ensures ≥128 dB A-weighted SNR with typical 150 Ω source impedance. |
Use Scenario: Summing amplifier and channel strip driver in 32-channel analog console with discrete op-amp topology. IC Role / Device Role / Timing Role: Final line-driver stage delivering ±10 V balanced output into 600 Ω loads. Use Value: Rail-to-rail swing and ±30 mA drive capability maintain 24-bit resolution across full output swing without clipping. |
| Broadcast Studio Equipment | Audio Test & Measurement |
Use Scenario: Reference-level output buffer in digital audio workstation (DAW) monitor controller with analog summing bus. IC Role / Device Role / Timing Role: High-fidelity unity-gain buffer isolating DAC output from variable load impedance. Use Value: 130 dB open-loop gain and 110 dB CMRR suppress ground-loop artifacts and crosstalk in multi-channel monitoring. |
Use Scenario: Precision signal generator output amplifier in audio analyzer requiring distortion-free 20 Hz–20 kHz sweeps. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain block in calibrated reference path with fixed G = +10. Use Value: 0.000008% CCIF IMD (19/20 kHz) validates measurement accuracy down to –142 dBc residual distortion floor. |
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 | Dual-channel version in SOIC-8; identical per-channel specs but shares thermal mass and supply pins | Used where space-constrained stereo paths require matched performance without inter-channel crosstalk | Select OPA1612AIDR only when dual-channel integration justifies tighter thermal coupling and shared supply routing |
| NE5532AP | Higher 5 nV/√Hz noise, 0.002% THD+N, 9 MHz GBW, and 9 V/μs slew rate; requires ±12 V minimum supply | Legacy audio design with relaxed SNR targets and lower bandwidth needs (e.g., consumer AV receivers) | Choose NE5532AP only for cost-sensitive, non-critical audio paths where 110 dB SNR suffices and PCB layout cannot accommodate newer thermal pads |
Compared with OPA1611AID, the OPA1612AIDR offers identical per-channel performance in a dual configuration but introduces shared supply and thermal constraints, whereas the NE5532AP trades 4.5× higher noise and 3× lower slew rate for broader legacy compatibility and lower unit cost - making OPA1611AID the sole choice for new high-resolution audio designs demanding ≤–136 dB THD+N.
Availability
OPA1611AID is available at Aetrix Electronics and suitable for professional audio equipment, microphone preamplifiers, and broadcast studio equipment requiring stable component supply across long production lifecycles and temperature extremes (–40°C to +85°C).
Supply support for OPA1611AID 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 OPA1611AID belongs to TI's SoundPlus™ audio op-amp family, engineered specifically for high-end audio applications where ultralow noise, vanishingly low distortion, and rail-to-rail output fidelity are non-negotiable design requirements.
FAQ
What is the maximum capacitive load the OPA1611AID can drive without instability?
The OPA1611AID maintains stability driving up to 500 pF into a 2-kΩ load with G = +1, as confirmed by small-signal overshoot testing in the datasheet (Figure 19). For loads exceeding 100 pF, a series resistor (25–50 Ω) between amplifier output and capacitance is recommended to preserve phase margin. This behavior is consistent across its full ±2.25 V to ±18 V supply range, and OPA1611AID does not require external compensation networks in standard line-driver configurations.
Does the OPA1611AID support single-supply operation?
Yes, the OPA1611AID operates with single-ended supplies (e.g., +5 V and ground) provided the input common-mode voltage remains within (V–) + 2 V to (V+) – 2 V and output swing stays within the rail-to-rail limit. However, its bipolar input stage performs optimally with dual supplies; for true single-supply audio applications, TI recommends biasing the IN+ pin at mid-supply using precision resistors and decoupling capacitors to maintain DC accuracy and noise performance - a technique validated in OPA1611AID application circuits.
How does the exposed thermal pad on the OPA1611AID SOIC-8 package affect thermal performance?
The exposed thermal pad on the OPA1611AID's SOIC-8 package is electrically connected to V– and must be soldered to a copper pour tied to the V– plane. Doing so reduces θJA from 150°C/W (unsoldered) to ~110°C/W (soldered), lowering junction temperature by up to 12°C at 3.6 mA quiescent current. This directly preserves the specified 1.1 nV/√Hz noise and 0.000015% THD+N - performance metrics that degrade measurably above 85°C junction temperature. OPA1611AID's datasheet mandates pad soldering for guaranteed operation across –40°C to +85°C ambient.
Can the OPA1611AID replace the OPA2134 in existing designs?
OPA1611AID is not a direct drop-in replacement for OPA2134 due to differences in input bias current (±60 nA vs ±10 nA), noise profile (1.1 nV/√Hz vs 8 nV/√Hz), and supply current (3.6 mA vs 4 mA). While both are unity-gain stable bipolar op-amps, OPA1611AID's lower noise and distortion require careful review of source impedance and PCB layout - especially around the thermal pad and power-supply decoupling. OPA1611AID offers superior audio performance but demands stricter thermal and grounding practices than OPA2134.
What is the input voltage range specification for the OPA1611AID?
The OPA1611AID specifies a common-mode input voltage range of (V–) + 2 V to (V+) – 2 V at room temperature - meaning it cannot accept inputs within 2 V of either rail. For example, with ±15 V supplies, valid input voltages span –13 V to +13 V. This limitation arises from its bipolar input stage architecture and is independent of output swing capability. Exceeding this range risks increased input bias current and degraded CMRR; OPA1611AID's datasheet confirms this range holds across –40°C to +85°C ambient.
OPA1611AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SoundPlus™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 27V/µs
- Gain Bandwidth Product:
- 80 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 60 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 3.6mA
- Current - Output / Channel:
- 62 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:
- 8-SOIC
OPA1611AID FAQ
1.How can I place an order for OPA1611AID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1611AID 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 OPA1611AID reliable?
The price and inventory of OPA1611AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1611AID is usually 5 days.
3.What payment methods are accepted for OPA1611AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1611AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1611AID?
OPA1611AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1611AID 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 OPA1611AID?
For technical support, including OPA1611AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1611AID requirements.
6.How does Aetrix verify that OPA1611AID is sourced from the original manufacturer or authorized distributors?
All OPA1611AID 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 OPA1611AID meets industry standards.
7.What is the process for return or replacement of OPA1611AID?
All OPA1611AID units undergo pre-shipment inspection (PSI). If there is an issue with OPA1611AID, 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 OPA1611AID part is unused and in its original packaging.
Return procedure for OPA1611AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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