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Texas Instruments OPA1655DBVR
- Part No.:
- OPA1655DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA1655DBVR.pdf
- Description:
- SOUNDPLUS ULTRA-LOW NOISE AND DI
- Quantity:
- Payment:
- Shipping:
Inventory:9,898
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Product details
Overview
OPA1655DBVR from Texas Instruments is a single-channel, FET-input audio operational amplifier optimized for ultra-low-noise, low-distortion signal amplification in professional audio front-ends. 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 loads while operating from ±2.25 V to ±18 V supplies. It serves as the core gain stage in microphone preamplifiers and tone-control circuits requiring high fidelity across full audio bandwidth.
For engineers reviewing the OPA1655DBVR datasheet, OPA1655DBVR pinout, OPA1655DBVR application, or OPA1655DBVR equivalent, this page provides verified specifications, validated SOT-23-5 pin mapping, real-world audio use cases, and two confirmed alternative op amps with documented performance trade-offs for critical signal-path selection.
Technical Context
The OPA1655DBVR employs a three-stage architecture with feedforward path and low-noise input stage to achieve simultaneous ultra-low voltage noise (2.9 nV/√Hz) and current noise (6 fA/√Hz), enabling clean amplification of high-impedance sources like condenser microphones. Its rail-to-rail output swings within 250 mV of rails under 2-kΩ load and sustains 24 V/µs slew rate without phase reversal during common-mode overdrive.
Designed for wide-supply operation (±2.25 V to ±18 V or 4.5 V–36 V), it maintains 150 dB open-loop gain and 53 MHz gain-bandwidth product across –40°C to +125°C, supporting robust performance in both battery-powered portable gear and mains-powered studio equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage noise density | 2.9 nV/√Hz at 10 kHz - enables <1 µV RMS integrated noise in 20 Hz–20 kHz band for mic preamp gain stages |
| THD+N | 0.000035% (–129 dB) at 20 kHz - preserves harmonic integrity in high-frequency transients (cymbals, string harmonics) |
| Output current | 100 mA - drives low-Z loads (600 Ω) and reactive speaker-level buffers without clipping |
| Rail-to-rail output | Swings to within 250 mV of supply rails - maximizes dynamic range in single-supply A/V receivers |
| Supply range | ±2.25 V to ±18 V - supports dual-rail studio gear and 5 V/12 V embedded audio modules |
| Quiescent current | 3.9 mA per channel - balances low-noise performance with thermal management in compact enclosures |
| Gain bandwidth | 53 MHz - ensures stable unity-gain stability with >60° phase margin into 100 pF capacitive loads |
Pinout & Package
OPA1655DBVR is housed in a 5-pin SOT-23 package (DBV), optimized for space-constrained PCB layouts in portable audio devices and modular effects pedals. Thermal resistance RθJA is 143.4°C/W, requiring minimal copper area for thermal relief in typical 2-layer designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Amplifier output | Delivers rail-to-rail swing; requires local 100-nF bypass capacitor to minimize PSRR degradation |
| 2: V– | Negative supply | Connects to lowest potential rail; must be decoupled independently from V+ for optimal CMRR |
| 3: +IN | Noninverting input | High-impedance FET node (10¹² Ω); sensitive to layout-induced leakage-keep trace short and guarded |
| 4: –IN | Inverting input | Used for feedback network connection; matched impedance to +IN reduces common-mode error |
| 5: V+ | Positive supply | Accepts up to +18 V; internal ESD protection clamps transients above ±2 kV HBM |
Key Features
| Feature | Design Value |
|---|---|
| Phase-reversal protection | Prevents output inversion when input exceeds common-mode range-critical for noninverting mic preamp topologies |
| EMI rejection ratio (EMIRR) | High immunity to RF rectification-induced offset shift-ensures stable DC bias in wireless audio receiver front-ends |
| Low input bias current | 10 pA maximum-enables high-value feedback networks (>1 MΩ) without gain error in active filters |
| Wide supply tolerance | Operates from ±2.25 V to ±18 V-supports legacy ±15 V studio gear and modern 5 V USB audio interfaces |
| Short-circuit protection | Withstands continuous 100 mA output fault current-protects against accidental speaker wire shorts |
Applications
| Professional Microphone Preamp | Active Baxandall Tone Control |
|---|---|
|
Use Scenario: Amplifying low-level signals from studio condenser microphones with 200 mV/Pa sensitivity and 150 Ω output impedance. IC Role / Device Role / Timing Role: Primary gain stage with 40 dB fixed gain, configured in noninverting topology with precision metal-film feedback resistors. Use Value: 2.9 nV/√Hz input noise ensures <0.5 µV total input-referred noise floor-preserves whisper-level vocal detail without audible hiss. |
Use Scenario: Implementing dual-band (bass/treble) equalization in analog mixing consoles using passive RC networks and op-amp buffers. IC Role / Device Role / Timing Role: Unity-gain buffer isolating tone-control RC sections from load variation; driven by potentiometer wiper outputs. Use Value: 100 mA output current prevents treble boost attenuation under 10 kΩ pot loading-maintains frequency response flatness across all settings. |
| Guitar Effects Pedal Buffer | A/V Receiver Line-Level Stage |
|
Use Scenario: High-impedance instrument input buffering for analog distortion pedals, preserving pickup resonance and touch dynamics. IC Role / Device Role / Timing Role: Impedance transformer between passive guitar pickups (5–10 kΩ) and downstream clipping circuitry. Use Value: 10 pA input bias current eliminates tone-sucking caused by capacitor leakage in vintage-style tone stacks-retains high-end sparkle. |
Use Scenario: Post-decoding line-level amplification in home theater receivers before DAC output or headphone drivers. IC Role / Device Role / Timing Role: Fixed-gain (2×) driver stage delivering 2 VRMS into 10 kΩ loads with minimal crosstalk between channels. Use Value: –135 dB channel separation at 1 kHz prevents dialogue bleed between left/right stereo tracks-enhances spatial imaging. |
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), dual-channel, SOIC-8 package; higher quiescent current (4.6 mA/ch) | Better suited for dual-channel line drivers; not pin-compatible with SOT-23-5 footprint | Select when dual-channel integration and sub-2 nV/√Hz noise outweigh board space constraints |
| NE5532DR | Higher voltage noise (5 nV/√Hz), bipolar input, ±22 V max supply; lower cost, mature industrial availability | Acceptable for consumer-grade mixers where –110 dB THD+N suffices; lacks phase-reversal protection | Select for cost-sensitive, non-critical audio paths where 5 nV/√Hz noise is tolerable and legacy design reuse is prioritized |
Compared with OPA1655DBVR, OPA1612AIDR offers superior noise performance but requires PCB redesign for SOIC-8, while NE5532DR trades 2.1× higher noise and no phase-reversal protection for broader supply tolerance and lower unit cost-making OPA1655DBVR the optimal balance for new high-fidelity SOT-23 designs.
Availability
OPA1655DBVR is available at Aetrix Electronics and suitable for professional microphone preamplifiers, active tone-control modules, and guitar effects pedal buffers requiring stable component supply and consistent audio-grade performance across production batches.
Supply support for OPA1655DBVR 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 expertise in precision audio signal chains and industrial-grade op amp design.
The OPA165x family was engineered specifically for professional and high-end consumer audio systems demanding ultra-low noise, near-zero distortion, and robust rail-to-rail operation-targeting microphone preamps, mixer channel strips, and premium A/V receivers.
FAQ
What is the maximum capacitive load the OPA1655DBVR can drive stably?
The OPA1655DBVR maintains stable operation with up to 100 pF capacitive load in unity-gain configuration, as verified by phase margin >60° in TI's SBOS901C datasheet Figure 6-35. For loads exceeding 100 pF, a series isolation resistor (RISO = 25 Ω) is recommended to preserve transient response and prevent peaking. This capability makes OPA1655DBVR suitable for driving long cables or ADC input filters without external compensation. Always verify stability with actual layout parasitics in final design.
Does the OPA1655DBVR support single-supply operation?
Yes, the OPA1655DBVR supports true single-supply operation from 4.5 V to 36 V, as specified in Section 6.3 of the datasheet. Its rail-to-rail output and input common-mode range extending to V– enable direct coupling in 5 V or 12 V systems. When used in single-supply mode, the noninverting input must be biased to mid-rail (e.g., via resistor divider) to maintain linear operation. The device's 3.9 mA quiescent current remains stable across this full voltage range.
How does the OPA1655DBVR's phase-reversal protection work in practice?
The OPA1655DBVR incorporates internal circuitry that clamps the output to the nearest rail instead of inverting polarity when the input exceeds the common-mode range-unlike conventional op amps. As shown in Figure 7-1 of the datasheet, this prevents catastrophic signal corruption in noninverting microphone preamp configurations during transient overloads. This behavior eliminates need for external diode clamping networks, simplifying BOM and improving reliability in live sound environments.
What is the typical input offset voltage drift of the OPA1655DBVR over temperature?
The OPA1655DBVR exhibits a typical input offset voltage drift of 0.3 µV/°C across –40°C to +125°C, with a maximum of 2 µV/°C per datasheet Section 6.6. This ultra-low drift ensures minimal DC error accumulation in precision DC-coupled audio paths, such as active crossover networks or servo-controlled headphone amplifiers. At ±18 V supply, the initial offset is ±1 mV max, resulting in <0.25 mV total drift over a 70°C ambient range-well below audibility thresholds.
Can the OPA1655DBVR replace the OPA2134 in an existing SOT-23-5 design?
No-the OPA2134 is only available in SOIC-8 and DIP-8 packages, with no SOT-23-5 variant. While both are FET-input audio op amps, OPA1655DBVR is not a drop-in replacement due to differing pinout (OPA1655DBVR: OUT-V–-+IN–IN-V+; OPA2134 has no SOT-23-5 pin mapping). Additionally, OPA1655DBVR offers 2.9 nV/√Hz noise vs OPA2134's 8 nV/√Hz and includes phase-reversal protection absent in OPA2134. Board redesign is required for migration.
OPA1655DBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 1
- 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
- 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:
- SOT-23-5
OPA1655DBVR FAQ
1.How can I place an order for OPA1655DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1655DBVR 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 OPA1655DBVR reliable?
The price and inventory of OPA1655DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1655DBVR is usually 5 days.
3.What payment methods are accepted for OPA1655DBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1655DBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1655DBVR?
OPA1655DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1655DBVR 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 OPA1655DBVR?
For technical support, including OPA1655DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1655DBVR requirements.
6.How does Aetrix verify that OPA1655DBVR is sourced from the original manufacturer or authorized distributors?
All OPA1655DBVR 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 OPA1655DBVR meets industry standards.
7.What is the process for return or replacement of OPA1655DBVR?
All OPA1655DBVR units undergo pre-shipment inspection (PSI). If there is an issue with OPA1655DBVR, 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 OPA1655DBVR part is unused and in its original packaging.
Return procedure for OPA1655DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA1655DBVR Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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