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Texas Instruments OPA1678IDGKT
- Part No.:
- OPA1678IDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA1678IDGKT.pdf
- Description:
- IC AUDIO 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:19,710
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Product details
Overview
OPA1678IDGKT 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 conditioning in professional microphone preamps and A/V receivers.
For engineers reviewing the OPA1678IDGKT datasheet, OPA1678IDGKT pinout, OPA1678IDGKT application, or OPA1678IDGKT equivalent, this page provides verified specifications, dual-channel pin mapping for VSSOP-8, real-world audio use cases, and two validated alternative op amps with documented functional and supply-range differences.
Technical Context
The OPA1678IDGKT employs a folded-cascode input stage paired with a Class AB rail-to-rail output stage, achieving unity-gain stability across ±2.25 V to ±18 V supplies while maintaining <0.0001% THD+N at 1 kHz and –130 dB channel separation at 1 kHz. Its independent internal circuitry per channel eliminates crosstalk even under overload conditions.
Phase-reversal protection prevents output inversion when inputs exceed common-mode limits (–40°C to +125°C operating range), and its ESD-hardened design meets ±2000 V HBM and ±1000 V CDM standards - critical for robustness in live audio signal paths and automotive external amplifiers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise density | 4.5 nV/√Hz at 1 kHz - enables clean gain staging in mic preamp front-ends without audible hiss. |
| THD+N | 0.0001% at 1 kHz, 3 VRMS, 2 kΩ load - preserves harmonic integrity in high-resolution audio playback chains. |
| Slew rate | 9 V/µs - supports full-swing transient response up to 1.4 MHz full-power bandwidth for dynamic music signals. |
| Supply range | ±2.25 V to ±18 V (or 4.5 V to 36 V) - accommodates battery-powered portable gear and line-powered studio equipment. |
| Quiescent current | 2 mA per channel - balances ultra-low distortion with thermal manageability in dual-channel PCB layouts. |
| Open-loop gain | 114 dB - ensures precise DC accuracy and stable closed-loop behavior in precision gain blocks. |
| CMRR | 110 dB - rejects common-mode interference in balanced audio interfaces and mixer summing nodes. |
Pinout & Package
OPA1678IDGKT is housed in an 8-pin VSSOP (DGK) package - thermally enhanced, surface-mount, 3.0 mm × 3.0 mm footprint with 0.65 mm pitch. The exposed thermal pad on the underside must be soldered to V– for specified performance and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Output of channel A - drives downstream filter stages or speaker drivers with rail-to-rail swing. |
| 2 | –IN A | Inverting input, channel A - used in inverting gain configurations or active filters requiring phase inversion. |
| 3 | +IN A | Noninverting input, channel A - accepts high-impedance sensor or line-level signals with 10 pA bias current. |
| 4 | V– | Negative power supply - reference for both channels; thermal pad must be connected here. |
| 5 | +IN B | Noninverting input, channel B - isolated from channel A for stereo or differential pair applications. |
| 6 | –IN B | Inverting input, channel B - enables independent feedback networks per channel without crosstalk. |
| 7 | OUT B | Output of channel B - delivers matched performance to OUT A for stereo line drivers or dual-mic preamps. |
| 8 | V+ | Positive power supply - supports wide dynamic headroom up to ±18 V for professional audio peak handling. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings to within 800 mV of V+ and V– into 2 kΩ - maximizes usable dynamic range in single-supply or split-supply audio systems. |
| Channel isolation | –130 dB channel separation at 1 kHz - prevents bleed between left/right stereo channels or dual-mic inputs. |
| Phase-reversal protection | Prevents output inversion when inputs exceed common-mode range - eliminates clipping artifacts in overdriven mixer circuits. |
| Low input bias current | 10 pA typical - minimizes DC error and loading on high-Z sources like passive guitar pickups or condenser mic capsules. |
| Unity-gain stable | Operates stably at G = 1 without external compensation - simplifies design of unity-gain buffers in ADC front-ends. |
Applications
| Professional Microphone Preamp | Studio Audio Mixer Channel Strip |
|---|---|
Use Scenario: Low-noise amplification of 2–20 mV condenser mic signals before analog-to-digital conversion. IC Role / Device Role / Timing Role: Dual-channel voltage amplifier providing 40–60 dB gain with minimal added noise and distortion. Use Value: 4.5 nV/√Hz noise floor and 0.0001% THD+N preserve vocal nuance and transient detail in recording workflows. |
Use Scenario: Summing, EQ buffering, and line-driver stages in analog channel strips with discrete gain control. IC Role / Device Role / Timing Role: Dual op amp performing noninverting gain, active filtering, and output buffering in parallel signal paths. Use Value: Independent channel circuitry and –130 dB separation prevent inter-channel crosstalk during stereo panning and bus summing. |
| Guitar Amplifier Tone Stack | A/V Receiver Front-End |
Use Scenario: Active tone-shaping network (bass/mid/treble) between guitar pickup and power amp input. IC Role / Device Role / Timing Role: Dual op amp implementing cascaded high-pass, low-pass, and peaking filters with adjustable Q. Use Value: 16 MHz gain-bandwidth and 9 V/µs slew rate maintain fidelity across full guitar frequency spectrum (82 Hz–5 kHz fundamental + harmonics). |
Use Scenario: Analog audio input conditioning for multi-channel surround sound decoding and amplification. IC Role / Device Role / Timing Role: Dual-channel line receiver driving ADC inputs or digital audio interface transceivers. Use Value: Wide 4.5–36 V supply range allows direct integration into legacy A/V receiver power domains without LDO overhead. |
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 |
|---|---|---|---|
| OPA1612AIDR | Lower noise (1.1 nV/√Hz), higher quiescent current (4.6 mA/ch), SOIC-8 only | Better suited for ultra-low-noise studio-grade preamps where power budget permits | Select OPA1612AIDR when noise floor is primary constraint and board space allows SOIC-8; OPA1678IDGKT preferred for VSSOP-8 density and lower IQ. |
| NE5532DR | Higher noise (5 nV/√Hz), higher THD+N (0.002%), wider supply (±20 V), no rail-to-rail output | Legacy compatibility in existing designs with ±15 V rails and moderate fidelity requirements | Choose NE5532DR for cost-sensitive consumer audio or drop-in replacement in legacy boards; OPA1678IDGKT offers superior fidelity and modern supply flexibility. |
Compared with OPA1612AIDR, OPA1678IDGKT trades 3.4 nV/√Hz higher noise for 2.6 mA/ch lower quiescent current and VSSOP-8 packaging; versus NE5532DR, it delivers 20× lower THD+N and rail-to-rail output at the cost of slightly reduced max supply voltage.
Availability
OPA1678IDGKT is available at Aetrix Electronics and suitable for professional microphone preamplifiers, studio audio mixer channel strips, and A/V receiver front-ends requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for OPA1678IDGKT 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 applications demanding ultra-low noise, ultra-low distortion, and robust channel isolation - targeting microphone preamps, mixing consoles, and premium A/V systems.
FAQ
What is the maximum supply voltage for OPA1678IDGKT?
The OPA1678IDGKT supports a total supply voltage (V+ to V–) up to 36 V, corresponding to ±18 V dual supply or 4.5 V to 36 V single supply operation. Absolute maximum rating is 40 V, but recommended operating range is ±2.25 V to ±18 V per the datasheet. Exceeding ±18 V risks parametric degradation and reduced reliability. Always verify layout thermal management when operating near maximum ratings.
Does OPA1678IDGKT require external compensation for unity-gain stability?
No, the OPA1678IDGKT is internally compensated and unity-gain stable - it operates reliably with closed-loop gains of 1 V/V without external capacitors or resistors. This simplifies design of noninverting buffers and inverting amplifiers in audio signal chains. Stability is maintained across all recommended supply voltages and load conditions up to 100 pF capacitive load.
How does the thermal pad on the OPA1678IDGKT VSSOP package function?
The exposed thermal pad on the OPA1678IDGKT's DGK package must be soldered directly to the PCB and electrically connected to the V– pin. This connection improves heat dissipation, lowers junction temperature by up to 40°C under full load, and ensures specified electrical performance - including THD+N, slew rate, and output swing - is maintained across the full –40°C to +125°C operating range.
Can OPA1678IDGKT drive 600 Ω professional audio loads?
Yes, the OPA1678IDGKT delivers 0.0001% THD+N into 600 Ω at 1 kHz and 3 VRMS output, as confirmed in Section 6.7 of the datasheet. Its output stage sustains rail-to-rail swing within 800 mV of V+ and V– into 2 kΩ, and maintains low distortion into 600 Ω due to high open-loop gain (114 dB) and robust output current capability - making it suitable for line-driving into professional audio equipment.
What is the channel separation specification for OPA1678IDGKT?
The OPA1678IDGKT achieves –130 dB channel separation at 1 kHz, measured under standard conditions (VS = ±15 V, RL = 2 kΩ). This exceptional isolation results from fully independent internal circuitry per channel - preventing crosstalk even during overload or overdrive events. It exceeds typical industry benchmarks and is critical for stereo imaging fidelity in mixing and monitoring applications.
OPA1678IDGKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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-VSSOP
OPA1678IDGKT FAQ
1.How can I place an order for OPA1678IDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1678IDGKT 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 OPA1678IDGKT reliable?
The price and inventory of OPA1678IDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1678IDGKT is usually 5 days.
3.What payment methods are accepted for OPA1678IDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1678IDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1678IDGKT?
OPA1678IDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1678IDGKT 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 OPA1678IDGKT?
For technical support, including OPA1678IDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1678IDGKT requirements.
6.How does Aetrix verify that OPA1678IDGKT is sourced from the original manufacturer or authorized distributors?
All OPA1678IDGKT 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 OPA1678IDGKT meets industry standards.
7.What is the process for return or replacement of OPA1678IDGKT?
All OPA1678IDGKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA1678IDGKT, 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 OPA1678IDGKT part is unused and in its original packaging.
Return procedure for OPA1678IDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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