Specifications
| Type | Description |
|---|---|
| Part Number | OPA1678 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package / Case | OPA1678: SOIC-8 (D), VSSOP-8 (DGK), SON-8 (DRG) with exposed thermal pad |
| Number of Channels | 2; OPA1678 dual-channel version |
| Noise Density | 4.5 nV/√Hz at 1 kHz |
| Total Harmonic Distortion | 0.0001% at 1 kHz |
| Open-Loop Gain | 114 dB; RL = 2 kΩ |
| Common-Mode Rejection | 110 dB |
| Quiescent Current | 2 mA per channel |
| Input Bias Current | 10 pA typical |
| Slew Rate | 9 V/µs |
| Gain Bandwidth | 16 MHz; G = 1 |
| Stability | Unity-gain stable; G = 1 operation |
| Output Swing Type | Rail-to-rail output; output swing to within 800 mV with 2-kΩ load |
| Recommended Single Supply Voltage | 4.5 V min, 36 V max; over operating free-air temperature range |
| Recommended Dual Supply Voltage | ±2.25 V min, ±18 V max; over operating free-air temperature range |
| Recommended Operating Temperature | -40°C min, 125°C max; free-air operating temperature |
| Absolute Maximum Supply Voltage | 40 V max; VS = (V+) - (V-), over operating free-air temperature range |
| Absolute Maximum Input Voltage | (V-) - 0.5 V min, (V+) + 0.5 V max; over operating free-air temperature range |
| Absolute Maximum Input Current | -10 mA min, 10 mA max; all pins except power-supply pins |
| Output Short-Circuit Current | Continuous; short-circuit to VS/2, one amplifier per package |
| Absolute Maximum Operating Temperature | -55°C min, 125°C max; TA |
| Absolute Maximum Junction Temperature | 150°C max; TJ |
| Storage Temperature | -65°C min, 150°C max; Tstg |
| ESD Human-Body Model | ±2000 V; per ANSI/ESDA/JEDEC JS-001 |
| ESD Charged-Device Model | ±1000 V; per JEDEC JESD22-C101 |
| ESD Machine Model | ±200 V; Machine Model; note says not tested on OPA1679IRUM |
| OPA1678 SOIC-8 Junction-to-Ambient Thermal Resistance | 144°C/W; D package, 8 pins |
| OPA1678 VSSOP-8 Junction-to-Ambient Thermal Resistance | 219°C/W; DGK package, 8 pins |
| OPA1678 SON-8 Junction-to-Ambient Thermal Resistance | 66.9°C/W; DRG package, 8 pins |
| OPA1678 SOIC-8 Junction-to-Case Top Thermal Resistance | 77°C/W; D package, 8 pins |
| OPA1678 VSSOP-8 Junction-to-Case Top Thermal Resistance | 79°C/W; DGK package, 8 pins |
| OPA1678 SON-8 Junction-to-Case Top Thermal Resistance | 54.5°C/W; DRG package, 8 pins |
| OPA1678 SOIC-8 Junction-to-Board Thermal Resistance | 62°C/W; D package, 8 pins |
| OPA1678 VSSOP-8 Junction-to-Board Thermal Resistance | 104°C/W; DGK package, 8 pins |
| OPA1678 SON-8 Junction-to-Board Thermal Resistance | 40.4°C/W; DRG package, 8 pins |
| OPA1678 SOIC-8 Junction-to-Top Characterization Parameter | 28°C/W; D package, 8 pins |
| OPA1678 VSSOP-8 Junction-to-Top Characterization Parameter | 15°C/W; DGK package, 8 pins |
| OPA1678 SON-8 Junction-to-Top Characterization Parameter | 1.9°C/W; DRG package, 8 pins |
| OPA1678 SOIC-8 Junction-to-Board Characterization Parameter | 61°C/W; D package, 8 pins |
| OPA1678 VSSOP-8 Junction-to-Board Characterization Parameter | 102°C/W; DGK package, 8 pins |
| OPA1678 SON-8 Junction-to-Board Characterization Parameter | 40.4°C/W; DRG package, 8 pins |
| OPA1678 SON-8 Junction-to-Case Bottom Thermal Resistance | 10.8°C/W; DRG package, 8 pins |
| OPA1678 Pin 1 | OUT A; SOIC-8, VSSOP-8, SON-8 top view |
| OPA1678 Pin 2 | -IN A; inverting input, channel A |
| OPA1678 Pin 3 | +IN A; noninverting input, channel A |
| OPA1678 Pin 4 | V-; negative lowest power supply |
| OPA1678 Pin 5 | +IN B; noninverting input, channel B |
| OPA1678 Pin 6 | -IN B; inverting input, channel B |
| OPA1678 Pin 7 | OUT B; output, channel B |
| OPA1678 Pin 8 | V+; positive highest power supply |
| OPA1678 Thermal Pad Connection | Connect thermal die pad to V-; DRG SON-8 package with exposed thermal pad |
| Datasheet Status | request_only |
Product Overview
The OPA1678 is a Texas Instruments dual audio operational amplifier in the Signal_Chain category. It is the dual-channel version with 2 amplifiers and is specified with 4.5 nV/√Hz noise density at 1 kHz, 0.0001% total harmonic distortion at 1 kHz, 114 dB open-loop gain with RL = 2 kΩ, and 110 dB common-mode rejection.
For signal-chain design, the device combines 16 MHz gain bandwidth at G = 1 with 9 V/µs slew rate and unity-gain stability. Input bias current is 10 pA typical, and quiescent current is 2 mA per channel. The output is rail-to-rail, with output swing to within 800 mV using a 2-kΩ load.
OPA1678 package options include SOIC-8 (D), VSSOP-8 (DGK), and SON-8 (DRG) with exposed thermal pad. Pinout includes OUT A, -IN A, +IN A, V-, +IN B, -IN B, OUT B, and V+. For the DRG SON-8 package, the thermal die pad is connected to V-.
Key Features
- Dual-channel audio operational amplifier with 2 channels
- 4.5 nV/√Hz noise density at 1 kHz
- 0.0001% total harmonic distortion at 1 kHz
- 16 MHz gain bandwidth at G = 1
- 9 V/µs slew rate for signal-chain designs
- Unity-gain stable for G = 1 operation
- Rail-to-rail output with 2-kΩ load condition
- 10 pA typical input bias current
- 4.5 V to 36 V single-supply operation
- ±2.25 V to ±18 V dual-supply operation
- SOIC-8, VSSOP-8, and SON-8 package options
- DRG thermal die pad connects to V-
Typical Applications
- Dual-channel audio signal paths
- Audio operational amplifier stages
- Unity-gain audio buffers
- Rail-to-rail output audio circuits
- Single-supply signal-chain designs
- Dual-supply signal-chain designs
- Low-bias-current input stages
- SOIC-8, VSSOP-8, SON-8 assemblies
Procurement Notes
When requesting a quote for OPA1678, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
How many amplifier channels does the OPA1678 include?
The OPA1678 is the dual-channel version and includes 2 amplifier channels. The pinout identifies channel A pins for OUT A, -IN A, and +IN A, plus channel B pins for +IN B, -IN B, and OUT B.
What supply voltage range is recommended for OPA1678?
For single-supply operation, the recommended range is 4.5 V to 36 V. For dual-supply operation, the recommended range is ±2.25 V to ±18 V, both specified over the operating free-air temperature range.
Which packages are listed for the OPA1678?
The OPA1678 is listed in SOIC-8 (D), VSSOP-8 (DGK), and SON-8 (DRG) packages. The DRG SON-8 package includes an exposed thermal pad, and the extracted pin data specifies connecting that thermal die pad to V-.
What are the key small-signal performance values?
The extracted datasheet facts list 4.5 nV/√Hz noise density at 1 kHz, 0.0001% total harmonic distortion at 1 kHz, 16 MHz gain bandwidth at G = 1, and 9 V/µs slew rate.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.