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Texas Instruments OPA1656ID
- Part No.:
- OPA1656ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA1656ID.pdf
- Description:
- IC AUDIO 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:780
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Product details
Overview
OPA1656ID from Texas Instruments is a dual-channel, FET-input audio operational amplifier engineered for ultra-low-noise, low-distortion signal amplification in high-fidelity analog audio paths. It delivers 2.9 nV/√Hz voltage noise at 10 kHz, –129 dB THD+N at 20 kHz, and 100 mA output drive into 2 kΩ, enabling use in professional microphone preamplifiers and active tone control circuits.
For engineers reviewing the OPA1656ID datasheet, OPA1656ID pinout, OPA1656ID application, or OPA1656ID equivalent, this page provides verified specifications, SOIC-8 package terminal mapping, real-world audio system roles, and two validated alternative op amps with documented functional and application-level differences.
Technical Context
The OPA1656ID employs a three-stage gain architecture with feedforward path to simultaneously optimize noise floor and harmonic linearity across full audio bandwidth (20 Hz–20 kHz). Its FET-input stage achieves 10 pA input bias current and 6 fA/√Hz current noise, while rail-to-rail output swing within 250 mV of supplies supports wide dynamic range in ±2.25 V to ±18 V systems.
It features internal phase-reversal protection that clamps output instead of inverting polarity when inputs exceed common-mode range, and maintains >106 dB CMRR and >143 dB PSRR up to 100 kHz-critical for rejecting power supply ripple and crosstalk in multi-channel mixer designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage noise density | 2.9 nV/√Hz at 10 kHz - enables <0.53 µVRMS integrated noise in 20 Hz–20 kHz band for mic preamp front-ends |
| THD+N | 0.000035% (–129 dB) at 20 kHz - preserves transient integrity and harmonic texture in high-resolution audio playback |
| Gain bandwidth | 53 MHz - supports stable unity-gain and G=+10 configurations with >20 MHz closed-loop bandwidth |
| Slew rate | 24 V/µs - prevents slew-induced distortion on fast transients like drum hits or guitar plucks |
| Output current | ±100 mA - drives low-impedance loads (e.g., 600 Ω pro audio lines) without clipping or thermal foldback |
| Supply range | ±2.25 V to ±18 V - accommodates battery-powered portable gear and high-headroom studio equipment |
| Quiescent current | 3.9 mA per channel - balances low-noise performance with thermal management in dual-channel PCB layouts |
Pinout & Package
OPA1656ID is supplied in an 8-pin SOIC (D) package with exposed pad (not electrically connected), optimized for thermal dissipation in audio PCBs with ground-plane copper fill under the package.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplified output signal for channel A; rail-to-rail swing within 250 mV of V± with 2 kΩ load |
| 2 | –IN A | Inverting input for channel A; high-impedance FET node (1012 Ω || 1.9 pF) |
| 3 | +IN A | Noninverting input for channel A; common-mode range extends to within 2.25 V of either supply rail |
| 4 | V– | Negative supply connection; must be decoupled with ≥0.1 µF ceramic capacitor near pin |
| 5 | +IN B | Noninverting input for channel B; independent of channel A, enabling stereo or differential configurations |
| 6 | –IN B | Inverting input for channel B; matched offset and noise characteristics to channel A |
| 7 | OUT B | Amplified output signal for channel B; fully isolated from OUT A with –135 dB channel separation at 1 kHz |
| 8 | V+ | Positive supply connection; supports symmetrical dual or single-supply operation up to 36 V total |
Key Features
| Feature | Design Value |
|---|---|
| Phase-reversal protection | Prevents output inversion during input overdrive; output clamps to rail instead of flipping polarity-critical for noninverting mic preamp topologies |
| EMI rejection ratio (EMIRR) | High immunity to RF rectification artifacts (e.g., GSM burst noise); avoids audible clicks or DC offset shifts in wireless microphone receivers |
| Rail-to-rail output | Swings to within 250 mV of V± under 2 kΩ load-maximizes usable dynamic range in ±15 V pro audio rails |
| Low input bias current | 10 pA typical-minimizes voltage error across high-value feedback networks (e.g., 100 kΩ+ tone control pots) |
| High open-loop gain | 150 dB - ensures <0.001% gain error in precision gain-setting applications like calibrated test equipment |
Applications
| Professional Microphone Preamp | Active Stereo Tone Control |
|---|---|
|
Use Scenario: Low-noise amplification of condenser microphone capsule signals before ADC conversion in field recorders or digital mixers. IC Role / Device Role / Timing Role: First-stage gain block with ultra-low voltage noise floor and high CMRR to reject phantom power ripple. Use Value: Achieves <60 dB SNR with 20 mV RMS mic output using 100 kΩ gain-setting resistor-no additional noise-shaping required. |
Use Scenario: Dual-channel Baxandall-style bass/treble adjustment in powered bookshelf speakers or DJ controllers. IC Role / Device Role / Timing Role: Dual op amp implementing simultaneous low-frequency boost/cut and high-frequency shelving with matched channel tracking. Use Value: Maintains <0.000035% THD+N across full 20 Hz–20 kHz sweep-preserves tonal balance without intermodulation artifacts. |
| Guitar Amplifier Effects Loop | Pro Audio Mixer Channel Strip |
|
Use Scenario: Buffered send/return interface between analog guitar pedalboard and high-impedance tube amplifier input. IC Role / Device Role / Timing Role: Unity-gain buffer isolating effects loop from cable capacitance and pedal loading. Use Value: 100 mA output drive sustains 1 VP signal integrity into 1000 pF cable + pedal input capacitance without slew limiting. |
Use Scenario: Discrete channel gain, EQ, and summing stage in analog broadcast console with 48-channel count. IC Role / Device Role / Timing Role: Dual op amp handling post-fader amplification and stereo bus summing with minimal crosstalk. Use Value: –135 dB channel separation at 1 kHz prevents bleed between adjacent channels during dense multitrack mixes. |
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 voltage noise (1.1 nV/√Hz), but higher quiescent current (5.7 mA/ch) and narrower supply range (±2.25 V to ±18 V same, but no 4.5–36 V single-supply support) | Better suited for ultra-low-noise instrumentation; less optimal for battery-powered portable audio due to higher IQ | Select OPA1612AIDR only when sub-1.5 nV/√Hz noise is mandatory and power budget allows +46% IQ increase |
| LM4562MA/NOPB | Higher THD+N (0.00005% at 20 kHz), lower output current (±26 mA), and no phase-reversal protection | Valid for cost-sensitive consumer A/V receivers but unsuitable for pro mic preamps requiring >100 mA drive or input overvoltage robustness | Choose LM4562MA/NOPB only in fixed-gain, low-output-current applications where EMI immunity and rail-to-rail swing are not required |
Compared with OPA1656ID, OPA1612AIDR trades higher power for lower noise, while LM4562MA/NOPB sacrifices distortion performance and protection features for legacy compatibility and lower cost-neither offers drop-in replacement capability without layout or stability revalidation.
Availability
OPA1656ID is available at Aetrix Electronics and suitable for professional audio mixer/control surface, guitar amplifier effects loop, and A/V receiver applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for OPA1656ID 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 heritage in precision op amp design for industrial and audio markets.
The OPA165x family was developed specifically for high-end audio signal chains where fidelity preservation is non-negotiable-targeting professional recording, live sound, and audiophile playback systems.
FAQ
What is the maximum capacitive load the OPA1656ID can drive without instability?
The OPA1656ID maintains stable operation with up to 100 pF capacitive load in unity-gain configuration, as confirmed by phase margin >60° in Figure 6-35 of the SBOS901C datasheet. For loads exceeding 100 pF, a series isolation resistor (RISO = 25–50 Ω) is recommended to preserve stability-this applies directly to OPA1656ID in headphone driver or cable-driven line output stages.
Does the OPA1656ID support single-supply operation?
Yes, the OPA1656ID operates from a single 4.5 V to 36 V supply, as specified in Section 6.3 Recommended Operating Conditions. Its rail-to-rail output and extended common-mode input range (to within 2.25 V of either rail) enable true single-supply audio designs-such as 12 V-powered active monitors-without level-shifting circuitry.
How does the OPA1656ID's phase-reversal protection function in practice?
When input voltage exceeds the linear common-mode range (e.g., >V+ – 2.25 V), the OPA1656ID clamps output to the nearest rail instead of reversing polarity-demonstrated in Figure 7-1 of SBOS901C. This behavior prevents catastrophic signal inversion in noninverting microphone preamp circuits, making OPA1656ID more robust than standard op amps like NE5532 in overdrive conditions.
What is the thermal resistance (RθJA) of the OPA1656ID in SOIC-8 package?
The junction-to-ambient thermal resistance for OPA1656ID in D (SOIC-8) package is 119.9°C/W, per Section 6.5 Thermal Information in SBOS901C. This value assumes JEDEC-standard 2S2P board layout; actual thermal performance improves significantly with ≥1 in² copper pour under the package and thermal vias to inner ground planes.
Can the OPA1656ID replace the OPA2134 in an existing design?
OPA1656ID offers superior noise (2.9 vs 8 nV/√Hz), lower distortion (–129 vs –110 dB), and higher output current (100 vs 35 mA) versus OPA2134, but requires validation of stability with existing compensation network due to its 53 MHz GBW. The pinout is identical in SOIC-8, but OPA1656ID's higher slew rate may expose layout parasitics previously masked by OPA2134's slower response.
OPA1656ID 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:
- Audio
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 24V/µs
- Gain Bandwidth Product:
- 53 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 3.9mA (x2 Channels)
- Current - Output / Channel:
- 100 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA1656ID FAQ
1.How can I place an order for OPA1656ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1656ID 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 OPA1656ID reliable?
The price and inventory of OPA1656ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1656ID is usually 5 days.
3.What payment methods are accepted for OPA1656ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1656ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1656ID?
OPA1656ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1656ID 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 OPA1656ID?
For technical support, including OPA1656ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1656ID requirements.
6.How does Aetrix verify that OPA1656ID is sourced from the original manufacturer or authorized distributors?
All OPA1656ID 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 OPA1656ID meets industry standards.
7.What is the process for return or replacement of OPA1656ID?
All OPA1656ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA1656ID, 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 OPA1656ID part is unused and in its original packaging.
Return procedure for OPA1656ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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