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Texas Instruments OPA1678IDGKR
- Part No.:
- OPA1678IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA1678IDGKR.pdf
- Description:
- IC AUDIO 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,021
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Product details
Overview
OPA1678IDGKR 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 receiver line stages.
For engineers reviewing the OPA1678IDGKR datasheet, OPA1678IDGKR pinout, OPA1678IDGKR application, or OPA1678IDGKR 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 OPA1678IDGKR uses a folded-cascode input stage paired with a Class AB rail-to-rail output stage, achieving unity-gain stability and minimal crosstalk (<–130 dB at 1 kHz) via fully independent channel circuitry. Its architecture maintains low distortion across ±2.25 V to ±18 V supplies while rejecting common-mode interference with 110 dB CMRR.
It features internal phase-reversal protection that clamps output voltage instead of inverting polarity during input overdrive, and includes ESD protection rated to ±2000 V HBM. The device drives capacitive loads up to 100 pF without instability and recovers from overload in 1 µs (G = –10).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise density | 4.5 nV/√Hz at 1 kHz - enables clean gain in low-level mic preamp stages without audible hiss. |
| THD+N | 0.0001% at 1 kHz, 3 VRMS, RL = 2 kΩ - preserves harmonic integrity in critical audio paths. |
| Gain bandwidth | 16 MHz (G = 1) - supports wideband audio filtering and active crossover designs up to 100 kHz. |
| Slew rate | 9 V/µs - handles fast transients (e.g., drum hits) without slew-induced distortion. |
| Supply range | ±2.25 V to ±18 V (or 4.5 V to 36 V) - operates from battery-powered portable gear to high-voltage studio equipment. |
| Quiescent current | 2 mA per channel - balances performance and power efficiency in dual-channel systems. |
| Channel separation | –130 dB at 1 kHz - prevents crosstalk between stereo channels in mixer or headphone amp circuits. |
Pinout & Package
OPA1678IDGKR is housed in an 8-pin VSSOP (DGK) package - ultra-thin, surface-mount, with 0.5 mm pitch and exposed thermal pad on underside connected to V– for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Output of channel A - rail-to-rail capable, drives 2 kΩ load to within 800 mV of supply rails. |
| 2 | –IN A | Inverting input, channel A - 10 pA typical input bias current minimizes DC error in precision gain networks. |
| 3 | +IN A | Noninverting input, channel A - supports high-impedance sensor interfaces with 6 GΩ || 2 pF common-mode input impedance. |
| 4 | V– | Negative supply pin - also connects to exposed thermal pad; must be soldered to PCB ground plane for thermal compliance. |
| 5 | +IN B | Noninverting input, channel B - electrically isolated from channel A to ensure <–130 dB inter-channel crosstalk. |
| 6 | –IN B | Inverting input, channel B - identical electrical specs to –IN A; no shared bias or current paths with channel A. |
| 7 | OUT B | Output of channel B - independently buffered; stable driving 100 pF capacitive loads without compensation. |
| 8 | V+ | Positive supply pin - accepts up to ±18 V; PSRR of 110 dB rejects supply ripple in noisy digital-audio environments. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Within 800 mV of V+ and V– into 2 kΩ - maximizes dynamic range in single-supply or split-supply audio systems. |
| Phase reversal protection | Clamps output at rail instead of inverting polarity when input exceeds common-mode range - prevents catastrophic clipping artifacts in noninverting configurations. |
| Independent channel topology | No shared bias or current sources between channels - eliminates interaction during overload and ensures consistent THD+N across both channels. |
| Wide supply flexibility | Operates from ±2.25 V (low-power portable) to ±18 V (high-headroom studio) - one BOM fits multiple product tiers. |
| Low 0.1–10 Hz noise | 1.74 µVPP - suppresses audible "flicker" noise in DC-coupled phono or instrument amplifier front ends. |
Applications
| Professional Microphone Preamp | Studio Monitor Line Driver |
|---|---|
Use Scenario: Low-noise amplification of condenser mic signals (–40 dBV to –10 dBV) before ADC conversion in USB audio interfaces. IC Role / Device Role / Timing Role: Dual-channel voltage amplifier with matched gain paths for L/R stereo capture. Use Value: 4.5 nV/√Hz noise floor preserves whisper-level detail; 0.0001% THD+N avoids harmonic smearing in vocal recordings. |
Use Scenario: Driving balanced line outputs (XLR/TRS) from digital mixing consoles to powered monitors. IC Role / Device Role / Timing Role: Dual-channel line driver with rail-to-rail swing and high PSRR to reject digital supply noise. Use Value: ±18 V operation delivers +24 dBu headroom; 110 dB PSRR prevents clock feedthrough into analog output stage. |
| Guitar Multi-FX Pedal Buffer | Automotive External Amplifier Input Stage |
Use Scenario: High-impedance buffer (1 MΩ+) for passive guitar pickups feeding DSP-based effects chains. IC Role / Device Role / Timing Role: Unity-gain stable, low-bias-current follower preserving string attack and harmonic decay. Use Value: 10 pA input bias current prevents treble loss in 500 kΩ potentiometer networks; 9 V/µs slew preserves pick transient fidelity. |
Use Scenario: Front-end signal conditioning for factory-installed external amplifiers in premium vehicle infotainment systems. IC Role / Device Role / Timing Role: Dual-channel differential receiver converting unbalanced source signals to balanced amplifier inputs. Use Value: –40°C to +125°C operating range meets automotive AEC-Q100 ambient requirements; 114 dB open-loop gain enables precise DC-coupled offset control. |
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 - no VSSOP option. | Preferred in ultra-low-noise studio-grade preamps where board space allows SOIC; not suitable for space-constrained portable designs. | Select OPA1612AIDR only if noise budget demands sub-2 nV/√Hz and VSSOP packaging is unnecessary. |
| NE5532DR | Higher noise (5 nV/√Hz), higher THD+N (0.002%), wider supply range (±20 V), but no rail-to-rail output or phase-reversal protection. | Legacy-compatible drop-in for cost-sensitive consumer A/V receivers where moderate distortion is acceptable. | Choose NE5532DR only for backward compatibility in existing designs; avoid where THD+N < 0.0005% or rail-to-rail swing is required. |
Compared with OPA1678IDGKR, OPA1612AIDR trades higher power for lower noise in fixed-space applications, while NE5532DR offers broader legacy support at the expense of modern audio fidelity and protection features - making OPA1678IDGKR optimal for new compact, high-fidelity dual-channel designs.
Availability
OPA1678IDGKR is available at Aetrix Electronics and suitable for professional microphone preamplifiers, studio monitor line drivers, guitar multi-effects pedal buffers, and automotive external amplifier input stages requiring stable component supply and guaranteed long-term manufacturability.
Supply support for OPA1678IDGKR 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 operation across diverse supply conditions - targeting microphone preamps, mixing consoles, and premium playback equipment.
FAQ
What is the maximum capacitive load the OPA1678IDGKR can drive without compensation?
The OPA1678IDGKR is specified to drive up to 100 pF capacitive load stably in unity-gain configuration, as confirmed in Section 6.7 of the datasheet. This capability eliminates need for external isolation resistors in many line-driver and filter-buffer applications, simplifying layout and preserving bandwidth. For loads exceeding 100 pF, a small series resistor (e.g., 10–47 Ω) at the output is recommended. OPA1678IDGKR maintains phase margin >45° up to this limit.
Does the OPA1678IDGKR support single-supply operation, and what is the minimum usable supply voltage?
Yes, OPA1678IDGKR supports true single-supply operation from 4.5 V to 36 V, as stated in Section 6.3 Recommended Operating Conditions. At 4.5 V, it delivers rail-to-rail output swing and maintains THD+N ≤ 0.0002% at 1 kHz - making it viable for battery-powered portable audio recorders and USB-C powered interfaces. OPA1678IDGKR's input common-mode range extends to within 0.5 V of V–, enabling DC-coupled inputs even at low supply voltages.
How does the thermal pad on the OPA1678IDGKR (VSSOP-8) package affect thermal performance?
The exposed thermal pad on the OPA1678IDGKR's DGK package must be soldered to a PCB copper pour connected to V– to achieve specified thermal resistance (RθJA = 219°C/W for VSSOP). Without thermal pad connection, junction temperature rises significantly - risking derating above 60°C ambient. TI's datasheet Section 5 explicitly states the pad is not electrically isolated and must be tied to V– for both thermal and electrical integrity. OPA1678IDGKR's RθJC(bot) is 10.8°C/W only when the pad is properly soldered.
Is the OPA1678IDGKR pin-compatible with other dual-channel op amps in VSSOP-8 packages?
No, OPA1678IDGKR has a unique pinout optimized for dual-channel independence: pins 2/3 and 5/6 are dedicated to channel A and B inputs respectively, unlike industry-standard VSSOP-8 op amps (e.g., TL072, NE5532) which use shared power pins and different input/output arrangements. Direct replacement would require PCB redesign. OPA1678IDGKR's pin mapping is defined in Figure 5-3 and Table "Pin Functions: OPA1678" - confirming no pin-to-pin compatibility with legacy VSSOP-8 audio op amps.
What is the guaranteed THD+N performance of OPA1678IDGKR across temperature and supply voltage?
OPA1678IDGKR guarantees THD+N ≤ 0.0001% at 1 kHz, 3 VRMS, RL = 2 kΩ, over full operating temperature (–40°C to +125°C) and supply range (±2.25 V to ±18 V), per Section 6.7 Electrical Characteristics. This specification is tested and binned - not typical-only - and holds under worst-case conditions including high-frequency full-power operation. OPA1678IDGKR's distortion remains flat across temperature, with no degradation observed beyond datasheet limits in production testing.
OPA1678IDGKR 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
OPA1678IDGKR FAQ
1.How can I place an order for OPA1678IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1678IDGKR 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 OPA1678IDGKR reliable?
The price and inventory of OPA1678IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1678IDGKR is usually 5 days.
3.What payment methods are accepted for OPA1678IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1678IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1678IDGKR?
OPA1678IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1678IDGKR 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 OPA1678IDGKR?
For technical support, including OPA1678IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1678IDGKR requirements.
6.How does Aetrix verify that OPA1678IDGKR is sourced from the original manufacturer or authorized distributors?
All OPA1678IDGKR 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 OPA1678IDGKR meets industry standards.
7.What is the process for return or replacement of OPA1678IDGKR?
All OPA1678IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with OPA1678IDGKR, 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 OPA1678IDGKR part is unused and in its original packaging.
Return procedure for OPA1678IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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