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Texas Instruments OPA1671IDBVT
- Part No.:
- OPA1671IDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA1671IDBVT.pdf
- Description:
- IC AUDIO 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,231
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Product details
Overview
OPA1671IDBVT from Texas Instruments is a rail-to-rail input/output, low-noise audio operational amplifier in a 5-pin SOT-23 package. It delivers 4.0 nV/√Hz voltage noise at 10 kHz, –109 dB THD+N at 1 kHz, and 13 MHz gain-bandwidth, enabling high-fidelity microphone preamplification and DAC buffering in portable 1.7–5.5 V systems.
For engineers reviewing the OPA1671IDBVT datasheet, OPA1671IDBVT pinout, OPA1671IDBVT application, or OPA1671IDBVT equivalent, key selection criteria include its 10 pA input bias current, 5 V/µs slew rate, 0.75 µs settling time to 0.1%, and verified performance in electret microphone circuits with 100 V/V gain and 20 Hz–20 kHz bandwidth.
Technical Context
The OPA1671IDBVT uses a CMOS-input stage with complementary N- and P-channel differential pairs to achieve true rail-to-rail input operation across the full supply range (1.7 V to 5.5 V). Its internal topology eliminates input diodes, allowing differential input voltages up to the full supply without excessive current flow.
It integrates an internal 20 MHz cutoff EMI rejection filter on both inputs, delivering ≥30 dB EMIRR at 400 MHz and ≥100 dB at 5 GHz. The class AB output stage drives ≤10 kΩ loads while maintaining rail-to-rail swing and low distortion (–109 dB) at 1 VRMS output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 13 MHz - supports stable unity-gain and high-gain audio signal conditioning up to ~100 kHz closed-loop bandwidth |
| Voltage noise density | 4.0 nV/√Hz at 10 kHz - enables sub-1 µV/√Hz input-referred noise in electret mic preamps with low source impedance |
| THD+N | –109 dB (0.00035%) at 1 kHz - preserves harmonic integrity in line-level and DAC output buffering |
| Slew rate | 5 V/µs - prevents slew-induced distortion on fast transients in 20 kHz audio signals |
| Supply voltage range | 1.7 V to 5.5 V - operates from single Li-ion cells (3.0–3.7 V) or 5 V rails without level-shifting |
| Input bias current | ±10 pA - minimizes DC error in high-impedance sensor interfaces and passive RC filters |
| Common-mode input range | Rail-to-rail (V– to V+) - allows direct coupling in single-supply systems with ground-referenced sources |
Pinout & Package
The OPA1671IDBVT is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained portable audio PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Output | Class AB rail-to-rail output capable of sourcing 66 mA / sinking 57 mA; requires series resistor for >100 pF capacitive loads |
| 2 (V–) | Negative supply | Lowest potential rail; must be connected directly to ground or negative supply; no reverse polarity tolerance |
| 3 (+IN) | Noninverting input | High-impedance CMOS node; accepts rail-to-rail common-mode signals; sensitive to EMI without external filtering |
| 4 (–IN) | Inverting input | Differential input node; used for feedback in standard configurations; shares same EMI filter as +IN |
| 5 (V+) | Positive supply | Highest potential rail; supports up to 5.5 V; absolute max rating is 6 V - permanent damage occurs beyond this limit |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization in 1.7–5.5 V single-supply systems, eliminating need for level-shifting or dual supplies |
| Integrated EMI rejection filter | 20 MHz –3 dB cutoff reduces offset shift from GSM, Bluetooth®, and Wi-Fi interference without external components |
| Low input capacitance | 6 pF differential / 2.5 pF common-mode - minimizes phase shift in high-frequency active filters and improves stability with photodiode sensors |
| Ultra-low quiescent current | 0.94 mA per amplifier - extends battery life in always-on microphone wake-word detection circuits |
| Unity-gain stable | Eliminates need for external compensation in buffer, gain-of-2, or noninverting amplifier configurations |
Applications
| Electret Microphone Preamplifier | Auxiliary Line Input/Output |
|---|---|
Use Scenario: Amplifying low-level AC-coupled signals from electret condenser microphones in voice-controlled IoT devices. IC Role / Device Role / Timing Role: Noninverting preamplifier with 100 V/V gain, DC-blocking capacitors, and 20 Hz–20 kHz bandpass filtering. Use Value: 4.0 nV/√Hz noise ensures <1 µV/√Hz input-referred noise at 10 kHz, preserving SNR in far-field speech capture. | Use Scenario: Buffering analog audio between codec outputs and headphone amplifiers or line drivers in portable media players. IC Role / Device Role / Timing Role: Unity-gain voltage follower providing low-output-impedance drive and isolation between stages. Use Value: Rail-to-rail swing and –109 dB THD+N maintain signal fidelity across full 0–5 V output range without clipping or harmonic distortion. |
| Transimpedance Amplifier | Voltage Buffer for High-Resolution DACs |
Use Scenario: Converting photocurrent from precision optical sensors into voltage in industrial inspection systems. IC Role / Device Role / Timing Role: Inverting transimpedance amplifier with feedback resistor and capacitor for bandwidth control and stability. Use Value: 10 pA input bias current prevents significant DC error in high-value feedback resistors (>1 MΩ), improving accuracy. | Use Scenario: Isolating and driving the analog output of 24-bit audio DACs in professional audio equipment. IC Role / Device Role / Timing Role: Low-noise, low-distortion buffer ensuring DAC output remains uncorrupted by downstream load variations. Use Value: 13 MHz GBW and 5 V/µs slew rate preserve transient response of high-sample-rate (≥192 kHz) audio waveforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1672IDBVT | Dual-channel version in same SOT-23-8 package; identical noise (4.0 nV/√Hz), THD+N (–109 dB), and GBW (13 MHz) | Used where dual independent amplifiers are needed (e.g., stereo mic preamp); occupies more board area than single-channel OPA1671IDBVT | Select OPA1672IDBVT only when dual-channel functionality is required; not a drop-in replacement due to different pin count and layout |
| OPA1602AIDBVR | Lower noise (1.1 nV/√Hz), higher GBW (18 MHz), but higher quiescent current (1.6 mA) and narrower supply range (±2.25 V to ±18 V) | Better suited for high-end line-level amplification with dual supplies; not suitable for 1.7–5.5 V single-supply portable designs | Choose OPA1602AIDBVR only for bipolar-supply, ultra-low-noise line drivers - incompatible with OPA1671IDBVT's low-voltage operation |
Compared with OPA1672IDBVT and OPA1602AIDBVR, the OPA1671IDBVT uniquely balances ultra-low noise, rail-to-rail operation down to 1.7 V, and 0.94 mA quiescent current - making it optimal for space- and power-constrained electret microphone preamplifiers.
Availability
OPA1671IDBVT is available at Aetrix Electronics and suitable for electret microphone preamplifiers, portable DAC output buffering, and industrial transimpedance amplifier circuits requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for OPA1671IDBVT 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers and audio signal chain solutions.
The OPA1671IDBVT belongs to TI's OPA16xx ultra-low-noise audio op amp family, designed specifically for high-SNR microphone preamplification, portable audio interfaces, and precision sensor signal conditioning in battery-powered systems.
FAQ
What is the maximum supply voltage for the OPA1671IDBVT?
The OPA1671IDBVT has an absolute maximum supply voltage of 6 V, but its recommended operating range is 1.7 V to 5.5 V. Exceeding 6 V causes permanent damage. At 5.5 V, it delivers full rail-to-rail output swing and specified THD+N (–109 dB) performance. Operation at 5 V is typical in electret microphone circuits using the OPA1671IDBVT, balancing headroom and power efficiency.
Does the OPA1671IDBVT support rail-to-rail input with single-supply operation?
Yes, the OPA1671IDBVT supports true rail-to-rail input from V– to V+, including ground in single-supply configurations. This is achieved via complementary N- and P-channel input pairs, enabling direct coupling of AC signals referenced to ground without level-shifting circuitry. In a 5 V system with V– = 0 V and V+ = 5 V, the OPA1671IDBVT accepts input voltages from 0 V to 5 V - a key enabler for the OPA1671IDBVT's use in portable microphone preamplifiers.
What is the voltage noise density of the OPA1671IDBVT at 1 kHz and 10 kHz?
The OPA1671IDBVT has a voltage noise density of 7 nV/√Hz at 1 kHz and 4.0 nV/√Hz at 10 kHz. These values are measured under standard conditions (VS = ±2.5 V, RL = 10 kΩ, TA = 25°C) and reflect its optimized wideband noise profile. The 4.0 nV/√Hz figure at 10 kHz is critical for high-fidelity audio applications, and is explicitly validated in the OPA1671IDBVT datasheet Figure 13. This low noise enables the OPA1671IDBVT to achieve <1 µV/√Hz input-referred noise in typical electret microphone circuits.
Can the OPA1671IDBVT drive heavy capacitive loads directly?
No, the OPA1671IDBVT requires isolation for capacitive loads exceeding ~100 pF to maintain stability. Adding a 24.9 Ω to 49.9 Ω series resistor (RS) between the output and the load restores phase margin, as shown in datasheet Figure 21. Without RS, capacitive loads >100 pF cause overshoot and potential oscillation due to reduced loop gain at high frequencies. This requirement applies to all OPA1671IDBVT implementations driving cables, ADC input filters, or long PCB traces - a design constraint explicitly documented for the OPA1671IDBVT.
Is the OPA1671IDBVT suitable for electret microphone preamplifier designs?
Yes, the OPA1671IDBVT is explicitly qualified for electret microphone preamplifiers, as confirmed in its official datasheet Section 8.2 and Feature Description. Its 4.0 nV/√Hz noise, 10 pA input bias current, rail-to-rail input, and 5 V/µs slew rate enable high-SNR, low-distortion amplification of weak microphone signals. The OPA1671IDBVT reference design (Figure 34) achieves 100 V/V gain, 20 Hz–20 kHz bandwidth, and <1 µV/√Hz output noise - validating its suitability for voice capture in battery-powered devices.
OPA1671IDBVT 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:
- 5V/µs
- Gain Bandwidth Product:
- 13 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 940µA
- Current - Output / Channel:
- 66 mA
- Voltage - Supply Span (Min):
- 1.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
OPA1671IDBVT FAQ
1.How can I place an order for OPA1671IDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1671IDBVT 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 OPA1671IDBVT reliable?
The price and inventory of OPA1671IDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1671IDBVT is usually 5 days.
3.What payment methods are accepted for OPA1671IDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1671IDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1671IDBVT?
OPA1671IDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1671IDBVT 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 OPA1671IDBVT?
For technical support, including OPA1671IDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1671IDBVT requirements.
6.How does Aetrix verify that OPA1671IDBVT is sourced from the original manufacturer or authorized distributors?
All OPA1671IDBVT 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 OPA1671IDBVT meets industry standards.
7.What is the process for return or replacement of OPA1671IDBVT?
All OPA1671IDBVT units undergo pre-shipment inspection (PSI). If there is an issue with OPA1671IDBVT, 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 OPA1671IDBVT part is unused and in its original packaging.
Return procedure for OPA1671IDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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