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Texas Instruments OPA1671IDBVR
- Part No.:
- OPA1671IDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA1671IDBVR.pdf
- Description:
- IC AUDIO 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,804
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Product details
Overview
OPA1671IDBVR from Texas Instruments is a rail-to-rail input/output, low-noise audio operational amplifier optimized for electret microphone preamplification and high-fidelity signal conditioning. It delivers 4.0 nV/√Hz voltage noise at 10 kHz, –109 dB THD+N at 1 kHz, and 13 MHz gain-bandwidth product while operating from 1.7 V to 5.5 V supply - enabling high dynamic range in portable audio systems.
For engineers reviewing the OPA1671IDBVR datasheet, OPA1671IDBVR pinout, OPA1671IDBVR application, or OPA1671IDBVR equivalent, key selection criteria include its ultra-low noise floor, rail-to-rail CMVR (–40°C to +125°C), 940 µA quiescent current, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The OPA1671IDBVR employs a complementary differential input stage enabling true rail-to-rail common-mode input range (V– to V+), with seamless transition between P-channel and N-channel pairs across the full supply. Its class-AB output stage supports 10-kΩ loads and delivers 5 V/µs slew rate for fast settling in audio buffering and active filtering.
Internal EMI rejection filtering (–3 dB at ~20 MHz) suppresses RF rectification effects from GSM, Bluetooth®, and Wi-Fi bands (up to 5 GHz), while low 6 pF differential input capacitance minimizes phase shift in high-Z sensor interfaces like electret microphones and piezoelectric transducers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 13 MHz - enables stable unity-gain operation and supports >20 kHz audio bandwidth with ≥10× closed-loop gain. |
| Voltage noise density | 4.0 nV/√Hz at 10 kHz - ensures <1 µV/√Hz output-referred noise in typical electret preamp configurations. |
| THD+N | –109 dB (0.00035%) at 1 kHz - preserves harmonic integrity in line-level and DAC buffer applications. |
| Supply voltage range | 1.7 V to 5.5 V - supports single-supply operation from Li-ion battery (3.0–4.2 V) or regulated 3.3 V/5 V rails. |
| Input bias current | ±10 pA - eliminates significant DC error in high-impedance microphone bias networks and RC filters. |
| Quiescent current | 940 µA - enables low-power audio front-end design without compromising noise or bandwidth performance. |
| Common-mode input range | V– to V+ - allows direct interfacing with ground-referenced sensors and single-ended sources without level-shifting. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, gull-wing leads, JEDEC MO-178AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Amplifier output | Delivers rail-to-rail swing; capable of sourcing 66 mA / sinking 57 mA into 10-kΩ load. |
| 2 - V– | Negative supply | Reference for dual-supply operation; tied to GND in single-supply designs (e.g., 0 V to 5 V). |
| 3 - +IN | Noninverting input | High-impedance node (10¹³ Ω || 2.5 pF); accepts DC-coupled or AC-coupled signals up to V+. |
| 4 - –IN | Inverting input | Differential input node (6 pF capacitance); used for feedback in inverting/noninverting configurations. |
| 5 - V+ | Positive supply | Accepts 1.7–5.5 V; internal ESD protection rated to 2000 V HBM per JEDEC JS-001. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization in low-voltage (1.7 V) systems and eliminates need for external level-shifting circuitry. |
| EMI input filtering | Integrated low-pass filter rejects RF interference from 400 MHz to 5 GHz bands (≥30 dB EMIRR), preventing audible rectified artifacts. |
| Low input capacitance | 6 pF differential / 2.5 pF common-mode - reduces phase lag and instability when driving long cables or capacitive sensors. |
| Unity-gain stability | Guaranteed stable operation with no external compensation required, simplifying layout in gain-of-1 microphone preamp circuits. |
| Industrial temperature range | Specified from –40°C to +125°C - supports deployment in automotive infotainment, industrial audio recorders, and outdoor IoT devices. |
Applications
| Electret Microphone Preamplifier | Auxiliary Line Input/Output |
|---|---|
Use Scenario: Amplifies weak mV-level signals from electret condenser microphones in headset, conferencing, and voice assistant devices. IC Role / Device Role / Timing Role: Low-noise, high-input-impedance noninverting preamplifier with DC bias feed-through and AC-coupled output. Use Value: Achieves <1 µV/√Hz output noise at 10 kHz while consuming only 940 µA, extending battery life in portable voice capture systems. | Use Scenario: Buffers and conditions analog line-level signals (±1 V) between audio codecs, DSPs, and connectors in consumer AV equipment. IC Role / Device Role / Timing Role: Unity-gain voltage follower with rail-to-rail swing, preserving signal fidelity across 20 Hz–20 kHz bandwidth. Use Value: Delivers –109 dB THD+N and 13 MHz GBW to prevent intermodulation distortion during multi-channel mixing and routing. |
| Active Filter Circuit | Transimpedance Amplifier |
Use Scenario: Implements second-order low-pass, high-pass, or band-pass filters in audio equalizers and anti-aliasing stages. IC Role / Device Role / Timing Role: High-slew-rate (5 V/µs), low-distortion op amp configured in multiple-feedback (MFB) or state-variable topology. Use Value: Maintains filter Q-factor accuracy and passband flatness due to low input capacitance (6 pF) and wide GBW (13 MHz). | Use Scenario: Converts photodiode or current-output sensor signals to voltage in optical sensing and medical instrumentation. IC Role / Device Role / Timing Role: Low-input-bias-current (±10 pA) amplifier with precision feedback resistor network for sub-pA current resolution. Use Value: Minimizes dark-current-induced offset drift and Johnson noise contribution, critical for low-light detection accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1672IDBVR | Dual-channel version; identical noise (4.0 nV/√Hz), THD+N (–109 dB), and supply range; 1.3 mA IQ per channel. | Preferred where stereo preamp or dual-path signal conditioning is required; same footprint but higher total power draw. | Select OPA1672IDBVR only when dual amplifiers are needed - avoids board redesign but increases quiescent current by 38% per channel. |
| OPA1611AIDR | SOIC-8; lower noise (1.1 nV/√Hz), higher IQ (3.6 mA), ±2.25 V min supply; not rail-to-rail input. | Better suited for high-performance studio-grade line drivers where PCB area and power budget allow larger package and higher consumption. | Choose OPA1611AIDR only if ultra-low noise dominates over size/power constraints - incompatible pinout and supply requirements preclude drop-in replacement. |
Compared with OPA1671IDBVR, the OPA1672IDBVR offers channel count scalability without sacrificing noise or distortion, while the OPA1611AIDR trades compactness and efficiency for superior voltage noise in fixed-supply, space-tolerant designs.
Availability
OPA1671IDBVR is available at Aetrix Electronics and suitable for electret microphone preamplifiers, auxiliary line-level interfaces, and active filter circuits requiring stable component supply across industrial temperature ranges and high-volume production cycles.
Supply support for OPA1671IDBVR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPA1671 belongs to TI's Precision Audio Amplifier product line, engineered specifically for low-noise, low-distortion signal conditioning in battery-powered and space-constrained audio front-ends.
FAQ
What is the maximum supply voltage for the OPA1671IDBVR?
The absolute maximum supply voltage for the OPA1671IDBVR is 6 V, but the recommended operating range is 1.7 V to 5.5 V. Exceeding 5.5 V risks permanent damage per TI's Absolute Maximum Ratings. At 5.5 V, the device achieves optimal THD+N (–109 dB) and output swing (within 20 mV of rails), making it ideal for 5 V audio subsystems. The OPA1671IDBVR must never be operated above 6 V under any condition.
Does the OPA1671IDBVR support single-supply operation?
Yes, the OPA1671IDBVR fully supports single-supply operation from 1.7 V to 5.5 V. Its rail-to-rail input and output stages allow the common-mode input range to extend from V– (GND) to V+, and the output to swing within 20 mV of either rail. This enables direct coupling to ground-referenced sources like electret microphones and simplifies power architecture in portable devices - no charge pump or split-rail generator required for the OPA1671IDBVR.
What is the input voltage noise density of the OPA1671IDBVR at 1 kHz?
The OPA1671IDBVR has an input voltage noise density of 7 nV/√Hz at 1 kHz, as specified in the Electrical Characteristics table of the SBOS931B datasheet. This value is measured under standard conditions (VS = ±0.85 V to ±2.75 V, TA = 25°C, RL = 10 kΩ). Combined with its 4.0 nV/√Hz at 10 kHz and 45 nV/√Hz at 10 Hz, this profile confirms its suitability for wideband audio applications where mid-frequency noise directly impacts perceived clarity - a key parameter distinguishing the OPA1671IDBVR from general-purpose op amps.
Can the OPA1671IDBVR drive capacitive loads without oscillation?
The OPA1671IDBVR is not inherently stable into heavy capacitive loads (>100 pF) without isolation. TI recommends adding a series resistor (e.g., 50 Ω) between the output and capacitive load to maintain phase margin. Figure 21 in the SBOS931B datasheet shows overshoot increases significantly beyond 100 pF with no isolation. For applications like cable driving or ADC input buffering where CLOAD exceeds 100 pF, this external resistor is mandatory to prevent gain peaking or oscillation - a critical design consideration specific to the OPA1671IDBVR's internal compensation.
Is the OPA1671IDBVR pin-compatible with other SOT-23-5 op amps?
No, the OPA1671IDBVR is not universally pin-compatible with other SOT-23-5 op amps. Its pinout (OUT, V–, +IN, –IN, V+) follows TI's standard for single-channel precision op amps but differs from many competitors' assignments (e.g., some place V+ at Pin 1). Always verify pin functions using the DBV package diagram in Section 5 of SBOS931B. Substituting another SOT-23-5 op amp without cross-checking pin mapping risks incorrect biasing or output shorting - a known failure mode confirmed in OPA1671IDBVR application notes.
OPA1671IDBVR 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
OPA1671IDBVR FAQ
1.How can I place an order for OPA1671IDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1671IDBVR 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 OPA1671IDBVR reliable?
The price and inventory of OPA1671IDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1671IDBVR is usually 5 days.
3.What payment methods are accepted for OPA1671IDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1671IDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1671IDBVR?
OPA1671IDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1671IDBVR 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 OPA1671IDBVR?
For technical support, including OPA1671IDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1671IDBVR requirements.
6.How does Aetrix verify that OPA1671IDBVR is sourced from the original manufacturer or authorized distributors?
All OPA1671IDBVR 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 OPA1671IDBVR meets industry standards.
7.What is the process for return or replacement of OPA1671IDBVR?
All OPA1671IDBVR units undergo pre-shipment inspection (PSI). If there is an issue with OPA1671IDBVR, 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 OPA1671IDBVR part is unused and in its original packaging.
Return procedure for OPA1671IDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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