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Texas Instruments OPA1671IDCKT
- Part No.:
- OPA1671IDCKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA1671IDCKT.pdf
- Description:
- IC AUDIO 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,864
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Product details
Overview
OPA1671IDCKT from Texas Instruments is a rail-to-rail input/output, low-noise audio operational amplifier in SC-70-5 package, delivering 4.0 nV/√Hz voltage noise at 10 kHz, –109 dB THD+N at 1 kHz, and 13 MHz gain-bandwidth product. It operates from 1.7 V to 5.5 V supply and is optimized for electret microphone preamplification in portable audio systems.
For engineers reviewing the OPA1671IDCKT datasheet, OPA1671IDCKT pinout, OPA1671IDCKT application, or OPA1671IDCKT equivalent, key selection criteria include input voltage noise density, THD+N performance at audio frequencies, rail-to-rail common-mode range, quiescent current under 1 mA, and SC-70 footprint compatibility with space-constrained PCB layouts.
Technical Context
The OPA1671IDCKT uses a CMOS input stage with complementary N- and P-channel differential pairs enabling true rail-to-rail input operation across –40°C to +125°C. Its class-AB output stage delivers 5 V/µs slew rate and drives ≥10 kΩ loads while maintaining <0.00035% THD+N at 1 VRMS output.
Internal EMI filtering provides >30 dB rejection at 400 MHz–5 GHz, and its low 10 pA input bias current minimizes error in high-impedance sensor interfaces. The device is unity-gain stable and features 6 pF differential input capacitance-critical for stability in capacitive-source applications like electret microphones.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 13 MHz - supports stable gain ≥100 at 20 kHz with margin for anti-aliasing filter roll-off |
| Voltage noise density | 4.0 nV/√Hz at 10 kHz - enables <1 µV/√Hz output-referred noise in electret preamp designs |
| THD+N | –109 dB (0.00035%) at 1 kHz - preserves high-fidelity audio signal integrity in line-level and mic-level paths |
| Supply voltage range | 1.7 V to 5.5 V - compatible with single-cell Li-ion (3.0–4.2 V) and 5 V USB-powered audio systems |
| Input bias current | 10 pA - prevents DC error buildup in high-Z microphone bias networks and passive RC filters |
| Quiescent current | 940 µA - allows battery-operated devices to achieve >100-hour runtime with typical mic preamp duty cycle |
| Common-mode range | Rail-to-rail (V– to V+) - eliminates level-shifting circuitry in single-supply 3.3 V or 5 V audio front-ends |
Pinout & Package
OPA1671IDCKT is housed in a 5-pin SC-70 package (2.00 mm × 1.25 mm), optimized for high-density portable audio PCBs. Thermal resistance RθJA is 214.7°C/W, requiring minimal copper pour for industrial temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Delivers rail-to-rail swing; requires series resistor ≥50 Ω when driving >100 pF capacitive loads |
| 2 (V–) | Negative supply | Connect directly to ground in single-supply configurations; supports dual ±0.85 V to ±2.75 V operation |
| 3 (+IN) | Noninverting input | High-impedance CMOS node; accepts DC-coupled signals from sensors or AC-coupled from microphones via bias resistors |
| 4 (–IN) | Inverting input | Feedback node; sets closed-loop gain and bandwidth; sensitive to parasitic capacitance due to 6 pF differential input C |
| 5 (V+) | Positive supply | Accepts 1.7–5.5 V; decoupling capacitor (≥100 nF) required within 2 mm of pin for EMI immunity and stability |
Key Features
| Feature | Design Value |
|---|---|
| EMI rejection filter | Integrated 20 MHz low-pass input filter provides >30 dB attenuation at cellular/GPS/ISM bands (400 MHz–5 GHz) |
| Rail-to-rail input stage | Complementary N/P-channel pair enables full 0–5.5 V common-mode range without external level shifters |
| Low input capacitance | 6 pF differential / 2.5 pF common-mode - reduces phase lag in high-frequency feedback networks and sensor interfaces |
| Unity-gain stability | Stable with gain = 1; no external compensation required for buffer or gain-of-100 microphone preamp configurations |
| Industrial temp range | Specified from –40°C to +125°C - suitable for automotive infotainment, industrial audio recorders, and outdoor IoT devices |
Applications
| Electret Microphone Preamplifier | Auxiliary Line Input Buffer |
|---|---|
Use Scenario: Amplifying low-level (–40 dBV) output from electret condenser microphones in headset, voice assistant, or conferencing devices. IC Role / Device Role / Timing Role: Primary gain stage with DC bias feed and AC coupling; sets system SNR floor via voltage noise contribution. Use Value: 4.0 nV/√Hz noise density ensures <1 µV/√Hz output-referred noise at 10 kHz, meeting IEC 60268-4 SNR requirements for Class 1 audio. | Use Scenario: Conditioning line-level analog inputs (±1 V) from DACs, mixers, or legacy audio sources before ADC sampling. IC Role / Device Role / Timing Role: Unity-gain buffer isolating source impedance; maintains signal integrity across 20 Hz–20 kHz bandwidth. Use Value: Rail-to-rail I/O and –109 dB THD+N preserve dynamic range and prevent clipping distortion during peak transients. |
| Active Anti-Aliasing Filter | Transimpedance Amplifier for Photodiodes |
Use Scenario: Second-order low-pass filtering before sigma-delta ADC in portable audio recorders to suppress >20 kHz aliasing components. IC Role / Device Role / Timing Role: Configured as Sallen-Key topology; GBW and low input capacitance enable precise cutoff at 22 kHz with minimal phase distortion. Use Value: 13 MHz GBW supports >10× oversampling ratio for sharp filter rolloff without gain peaking or group delay variation. | Use Scenario: Converting photocurrent (100 nA–10 µA) from ambient light or pulse oximetry sensors into measurable voltage. IC Role / Device Role / Timing Role: High-gain TIA with low input bias current minimizing dark-current error and low voltage noise preserving weak-signal SNR. Use Value: 10 pA input bias current avoids offset drift in high-Rf configurations; 4.0 nV/√Hz noise dominates over resistor thermal noise below 10 kΩ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1672IDCKT | Dual-channel version in same SC-70-8 package; identical noise (4.0 nV/√Hz), THD+N (–109 dB), and GBW (13 MHz) | Requires two matched amplifiers (e.g., stereo mic preamp); occupies larger footprint than single-channel OPA1671IDCKT | Select OPA1672IDCKT only when dual-channel functionality is needed; otherwise OPA1671IDCKT saves board area and cost |
| NE5532DR | Higher noise (5 nV/√Hz), higher supply current (8 mA), wider SOIC-8 package; not rail-to-rail input | Suitable for line-level fixed-supply studio gear but incompatible with low-voltage portable designs or rail-to-rail signal chains | Choose NE5532DR only for legacy 15 V bipolar systems where power and noise budgets allow; avoid for battery-powered or 3.3 V designs |
Compared with OPA1672IDCKT and NE5532DR, the OPA1671IDCKT offers optimal trade-off of ultra-low noise, sub-1 mA quiescent current, rail-to-rail operation, and minimal SC-70 footprint-making it uniquely suited for space- and power-constrained electret microphone preamplifiers.
Availability
OPA1671IDCKT is available at Aetrix Electronics and suitable for electret microphone preamplifiers, auxiliary line input buffers, and active anti-aliasing filters requiring stable component supply across consumer, industrial, and automotive audio programs.
Supply support for OPA1671IDCKT 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, data converters, and power management ICs.
The OPA1671IDCKT belongs to TI's OPA167x low-noise audio op amp family, designed specifically for high-SNR, low-power portable audio signal chains-including microphone preamps, headphone drivers, and ADC/DAC interface buffering.
FAQ
What is the maximum supply voltage for OPA1671IDCKT?
The absolute maximum supply voltage for OPA1671IDCKT 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, OPA1671IDCKT achieves full rail-to-rail output swing and specified THD+N of –109 dB. Always use ≥100 nF ceramic decoupling on V+ and V– pins close to the package.
Does OPA1671IDCKT support single-supply operation?
Yes, OPA1671IDCKT fully supports single-supply operation from 1.7 V to 5.5 V. Its rail-to-rail input and output stages allow common-mode input down to V– (ground) and output swing within 20 mV of either rail. For single-supply use, bias the noninverting input at mid-supply (e.g., 2.5 V for 5 V supply) using a resistor divider or reference, as shown in the electret microphone schematic in the OPA1671IDCKT datasheet.
What is the input voltage noise density of OPA1671IDCKT at 1 kHz?
The input voltage noise density of OPA1671IDCKT is 7 nV/√Hz at 1 kHz, per the Electrical Characteristics table in the SBOS931B datasheet. This value is measured under standard conditions (VS = 1.7–5.5 V, TA = 25°C, RL = 10 kΩ). At 10 kHz, it improves to 4.0 nV/√Hz-critical for wideband audio fidelity where high-frequency noise dominates perceived hiss.
Can OPA1671IDCKT drive capacitive loads directly?
OPA1671IDCKT can drive ≤100 pF capacitive loads stably without isolation. For heavier loads (>100 pF), TI recommends adding a 50 Ω series resistor between the OUT pin and the load to maintain phase margin and prevent peaking or oscillation. This is especially critical in PCB traces longer than 2 cm or when interfacing with ADC input capacitance or long cables, as confirmed in Section 8.1.1 of the OPA1671IDCKT datasheet.
Is OPA1671IDCKT pin-compatible with other SC-70 op amps?
OPA1671IDCKT uses the standard 5-pin SC-70 (DCK) pinout (OUT, V–, +IN, –IN, V+), matching industry conventions for single-channel op amps in this package. However, it is not a drop-in replacement for all SC-70 op amps-differences in input structure (CMOS vs. bipolar), noise, and supply range require validation. Always verify biasing, stability, and signal chain performance when substituting, even with identical pinouts.
OPA1671IDCKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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:
- SC-70-5
OPA1671IDCKT FAQ
1.How can I place an order for OPA1671IDCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1671IDCKT 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 OPA1671IDCKT reliable?
The price and inventory of OPA1671IDCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1671IDCKT is usually 5 days.
3.What payment methods are accepted for OPA1671IDCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1671IDCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1671IDCKT?
OPA1671IDCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1671IDCKT 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 OPA1671IDCKT?
For technical support, including OPA1671IDCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1671IDCKT requirements.
6.How does Aetrix verify that OPA1671IDCKT is sourced from the original manufacturer or authorized distributors?
All OPA1671IDCKT 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 OPA1671IDCKT meets industry standards.
7.What is the process for return or replacement of OPA1671IDCKT?
All OPA1671IDCKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA1671IDCKT, 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 OPA1671IDCKT part is unused and in its original packaging.
Return procedure for OPA1671IDCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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