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Texas Instruments OPA1678IDRGT
- Part No.:
- OPA1678IDRGT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
OPA1678IDRGT.pdf
- Description:
- IC AUDIO 2 CIRCUIT 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:823
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Product details
Overview
OPA1678IDRGT from Texas Instruments is a dual-channel, low-distortion audio operational amplifier in an 8-pin VSSOP package, delivering 4.5 nV/√Hz input voltage noise, 0.0001% THD+N at 1 kHz, and rail-to-rail output swing within 800 mV of rails into 2 kΩ - enabling high-fidelity signal amplification in professional microphone preamps and A/V receiver line stages.
For engineers reviewing the OPA1678IDRGT datasheet, OPA1678IDRGT pinout, OPA1678IDRGT application, or OPA1678IDRGT equivalent, this page provides verified pin functions, real-world audio performance metrics, thermal design data for VSSOP-8, and validated alternatives for dual-channel low-noise op amp selection in ±2.25 V to ±18 V systems.
Technical Context
The OPA1678IDRGT uses a folded-cascode input stage with Class AB output biasing to achieve simultaneous low noise (4.5 nV/√Hz) and ultra-low distortion (0.0001% THD+N), while maintaining unity-gain stability across 16 MHz GBW and 9 V/µs slew rate. Its independent channel architecture eliminates crosstalk (<–130 dB at 1 kHz), critical for stereo audio paths.
It features phase-reversal protection that clamps output instead of inverting polarity during common-mode overdrive, and internal ESD protection rated to ±2000 V HBM - both confirmed in TI's SBOS855E revision December 2022 production data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise density | 4.5 nV/√Hz at 1 kHz - enables clean gain in mic preamp front-ends without audible hiss |
| THD+N | 0.0001% at 1 kHz, 3 VRMS, 2 kΩ load - preserves harmonic integrity in mastering-grade audio paths |
| Supply range | ±2.25 V to ±18 V (or 4.5 V to 36 V) - supports battery-powered portable gear and high-headroom studio equipment |
| Quiescent current | 2 mA per channel - allows dual-channel operation under tight power budgets in compact designs |
| Open-loop gain | 114 dB - ensures precise DC accuracy and minimal gain error in precision instrumentation-grade audio filters |
| Channel separation | –130 dB at 1 kHz - prevents stereo crosstalk in balanced line drivers and mixer summing amps |
| Rail-to-rail output | Swings to within 800 mV of rails into 2 kΩ - maximizes dynamic range without clipping in single-supply headphone amps |
| Gain bandwidth | 16 MHz at G = 1 - supports stable unity-gain configurations for active filters and buffer stages |
Pinout & Package
OPA1678IDRGT is packaged in an 8-pin VSSOP (DGK) with exposed thermal pad on underside. Thermal pad must be soldered to PCB ground plane or V– for specified thermal performance (RθJA = 219°C/W, RθJB = 104°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Output of channel A - drives external load directly; rail-to-rail swing capability requires proper decoupling |
| 2 | –IN A | Inverting input, channel A - used in inverting gain stages; matched impedance critical for noise rejection |
| 3 | +IN A | Noninverting input, channel A - high-impedance node (6 GΩ || 2 pF); sensitive to layout-induced pickup |
| 4 | V– | Negative supply pin - connects to lowest potential rail; thermal pad must be tied to V– for DRG/SON variants (not applicable here) |
| 5 | +IN B | Noninverting input, channel B - electrically isolated from channel A; no shared bias circuitry |
| 6 | –IN B | Inverting input, channel B - independent input stage prevents inter-channel interaction even under overload |
| 7 | OUT B | Output of channel B - fully independent output stage; supports separate feedback networks per channel |
| 8 | V+ | Positive supply pin - supplies both channels; requires local 100 nF ceramic + 10 µF tantalum decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Phase-reversal protection | Prevents output polarity inversion when inputs exceed common-mode range - eliminates latch-up risk in noninverting mic preamp topologies |
| Independent channel circuitry | Zero shared bias or signal paths between channels - ensures –130 dB crosstalk and full isolation during overload recovery |
| Low input bias current | 10 pA typical - minimizes voltage error in high-Z sensor interfaces like condenser microphone capsules |
| ESD robustness | ±2000 V HBM rating - withstands handling and board-level ESD events without parameter shift or failure |
| Wide supply flexibility | Operates from ±2.25 V to ±18 V - supports both low-voltage portable audio and high-dynamic-range studio gear |
Applications
| Professional Microphone Preamp | Studio Mixer Line Driver |
|---|---|
Use Scenario: Amplifying low-level signals from condenser microphones with minimal added noise and distortion. IC Role / Device Role / Timing Role: Dual-channel voltage amplifier in first-stage gain block, with one channel for left and one for right signal path. Use Value: 4.5 nV/√Hz noise density and 0.0001% THD+N preserve transient detail and harmonic richness in vocal recordings. |
Use Scenario: Driving long analog interconnects between mixer channels and external effects processors or recording interfaces. IC Role / Device Role / Timing Role: Dual-channel line driver providing low-output-impedance, rail-to-rail swing into 600 Ω loads. Use Value: –130 dB channel separation prevents stereo image collapse; 9 V/µs slew rate handles fast transients without slew-induced distortion. |
| Guitar Effects Pedal Buffer | A/V Receiver Audio Stage |
Use Scenario: Impedance buffering between high-Z guitar pickups and low-Z effects chain inputs to prevent tone loss. IC Role / Device Role / Timing Role: Unity-gain noninverting buffer per channel, leveraging rail-to-rail output and wide supply range. Use Value: 16 MHz GBW and unity-gain stability ensure flat frequency response up to 20 kHz; 2 mA/channel quiescent current extends battery life. |
Use Scenario: Post-decoding analog signal conditioning before power amplification in multi-channel home theater receivers. IC Role / Device Role / Timing Role: Dual-channel post-filter amplifier for L/R main channels, operating from ±15 V rails. Use Value: 114 dB open-loop gain maintains precise channel balance; ±2.25 V to ±18 V operation accommodates legacy and modern receiver power architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel low-noise audio op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1612AIDRGR | Lower noise (1.1 nV/√Hz), higher quiescent current (4.6 mA/ch), SOIC-8 only | Better suited for ultra-low-noise studio preamps where power budget allows | Select OPA1612AIDRGR when noise floor is primary constraint and VSSOP footprint is not required |
| NE5532DR | Higher noise (5 nV/√Hz), higher THD+N (0.005%), wider supply range (±20 V), legacy bipolar process | Established in consumer A/V gear; less suitable for high-resolution digital audio playback paths | Select NE5532DR for cost-sensitive, high-output-current applications where 0.0001% THD+N is not mandatory |
Compared with OPA1678IDRGT, OPA1612AIDRGR trades 2.3× lower noise for double the supply current and larger SOIC-8 footprint, while NE5532DR offers higher output drive but sacrifices 50× more distortion - making OPA1678IDRGT optimal for space-constrained, high-fidelity dual-channel audio where thermal management and headroom coexist.
Availability
OPA1678IDRGT is available at Aetrix Electronics and suitable for professional microphone preamplifiers, studio mixer line drivers, and A/V receiver audio stages requiring stable component supply, consistent parametric performance, and long-term industrial availability.
Supply support for OPA1678IDRGT 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 leadership in high-performance audio signal chain components.
The OPA167x family was designed specifically for professional and high-end consumer audio systems demanding ultra-low noise, near-zero distortion, and robust channel isolation - targeting microphone preamps, mixing consoles, and premium playback equipment.
FAQ
What is the maximum capacitive load the OPA1678IDRGT can drive stably?
The OPA1678IDRGT maintains stable operation with up to 100 pF capacitive load in unity-gain configuration, as verified by phase margin >40° and <10% overshoot in Figure 6-25 and Figure 6-26 of the SBOS855E datasheet. For loads exceeding 100 pF, external isolation resistor (e.g., 10–47 Ω) between output and capacitance is recommended to preserve stability. This behavior applies identically to both channels of the OPA1678IDRGT.
Does the OPA1678IDRGT require external compensation for unity-gain operation?
No, the OPA1678IDRGT is unity-gain stable by design and requires no external compensation components. Its internal compensation ensures ≥45° phase margin across all recommended operating conditions, including ±2.25 V to ±18 V supply and –40°C to +125°C temperature range. This stability is confirmed in Figure 6-5 (open-loop gain/phase vs frequency) and Section 7.1 of the OPA1678IDRGT datasheet.
How does the thermal pad on the OPA1678IDRGT package affect performance?
The OPA1678IDRGT uses a VSSOP-8 (DGK) package without an exposed thermal pad - unlike the SON-8 (DRG) variant. Therefore, no thermal pad connection is required or present. Thermal performance is characterized at RθJA = 219°C/W and RθJB = 104°C/W for the DGK package, and PCB copper area under the body remains the primary thermal path. This distinction is explicitly noted in Table 6-5 of the SBOS855E datasheet.
Can the OPA1678IDRGT operate from a single 5-V supply?
Yes, the OPA1678IDRGT supports single-supply operation from 4.5 V to 36 V, including 5 V. At 5 V, it delivers rail-to-rail output swing within 800 mV of each rail into 2 kΩ (i.e., ~0.8 V to ~4.2 V), and maintains 0.0001% THD+N at 1 kHz with appropriate input biasing. This makes the OPA1678IDRGT suitable for USB-powered audio interfaces and portable DAC/headphone amps.
What is the input common-mode voltage range for the OPA1678IDRGT?
The OPA1678IDRGT has an input common-mode voltage range of (V–) + 0.5 V to (V+) – 2 V, as specified in Section 6.7 of the SBOS855E datasheet. For example, with ±15 V supplies, inputs may range from –14.5 V to +13 V. This extended range enables direct coupling in many audio circuits and avoids level-shifting networks that degrade SNR - a key advantage over legacy op amps in the OPA1678IDRGT's target applications.
OPA1678IDRGT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 9V/µs
- Gain Bandwidth Product:
- 16 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 2mA (x2 Channels)
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SON (3x3)
OPA1678IDRGT FAQ
1.How can I place an order for OPA1678IDRGT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1678IDRGT 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 OPA1678IDRGT reliable?
The price and inventory of OPA1678IDRGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1678IDRGT is usually 5 days.
3.What payment methods are accepted for OPA1678IDRGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1678IDRGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1678IDRGT?
OPA1678IDRGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1678IDRGT 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 OPA1678IDRGT?
For technical support, including OPA1678IDRGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1678IDRGT requirements.
6.How does Aetrix verify that OPA1678IDRGT is sourced from the original manufacturer or authorized distributors?
All OPA1678IDRGT 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 OPA1678IDRGT meets industry standards.
7.What is the process for return or replacement of OPA1678IDRGT?
All OPA1678IDRGT units undergo pre-shipment inspection (PSI). If there is an issue with OPA1678IDRGT, 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 OPA1678IDRGT part is unused and in its original packaging.
Return procedure for OPA1678IDRGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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