Specifications
| Type | Description |
|---|---|
| Part Number | OPA1679 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package / Case | OPA1679: SOIC-14 (D), TSSOP-14 (PW), QFN-16 (RUM) with exposed thermal pad |
| Channel Count | 4 channels; OPA1679 quad-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 typ |
| 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; within 800 mV with 2-kΩ load |
| Single-Supply Voltage Range | 4.5 V to 36 V |
| Dual-Supply Voltage Range | ±2.25 V to ±18 V |
| Operating Temperature Range | -40°C to +85°C |
| Recommended Operating Temperature | -40°C to +125°C, TA |
| Absolute Maximum Supply Voltage | 40 V max, VS = (V+) - (V-) |
| Absolute Maximum Input Voltage | (V-) - 0.5 V to (V+) + 0.5 V |
| Absolute Maximum Input Current | -10 mA to +10 mA, 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 to +125°C, TA absolute maximum rating |
| Junction Temperature | 150°C max |
| Storage Temperature | -65°C to +150°C |
| ESD Rating HBM | ±2000 V, per ANSI/ESDA/JEDEC JS-001 |
| ESD Rating CDM | ±1000 V, per JEDEC JESD22-C101 |
| ESD Rating MM | ±200 V; not tested on OPA1679IRUM |
| OPA1679 SOIC-14 Junction-to-Ambient Thermal Resistance | 90°C/W, D package, 14 pins |
| OPA1679 TSSOP-14 Junction-to-Ambient Thermal Resistance | 127°C/W, PW package, 14 pins |
| OPA1679 QFN-16 Junction-to-Ambient Thermal Resistance | 38.5°C/W, RUM package, 16 pins |
| OPA1679 QFN-16 Junction-to-Case Bottom Thermal Resistance | 7.1°C/W, RUM package, 16 pins |
| Thermal Pad Connection | Connect exposed thermal die pad to V-, OPA1679 RUM QFN package |
| Datasheet Status | request_only |
Product Overview
The OPA1679 is a Texas Instruments quad audio operational amplifier for Signal_Chain designs that need four amplifier channels in one device. Its audio-focused parameters include 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.
The amplifier is unity-gain stable for G = 1 operation and provides 16 MHz gain bandwidth with a 9 V/μs slew rate. Typical input bias current is 10 pA, and typical quiescent current is 2 mA per channel. The rail-to-rail output swings to within 800 mV with a 2-kΩ load.
OPA1679 package choices include SOIC-14, TSSOP-14, and QFN-16 with an exposed thermal pad. For the RUM QFN package, the exposed thermal die pad is connected to V-. Recommended supplies are 4.5 V to 36 V single supply or ±2.25 V to ±18 V dual supply, supporting audio signal conditioning, buffering, and active-filter stages.
Key Features
- Four-channel quad audio operational amplifier
- 4.5 nV/√Hz noise density at 1 kHz
- 0.0001% total harmonic distortion at 1 kHz
- 16 MHz gain bandwidth for G = 1
- Unity-gain stable for G = 1 operation
- 9 V/μs slew rate
- Rail-to-rail output within 800 mV at 2 kΩ
- 4.5 V to 36 V single-supply operation
- ±2.25 V to ±18 V dual-supply operation
- 10 pA typical input bias current
- 2 mA typical quiescent current per channel
- QFN exposed thermal pad connects to V-
Typical Applications
- Quad audio signal paths
- Active audio filter stages
- Line-level audio buffering
- Audio mixer summing stages
- Audio signal conditioning
- Unity-gain audio buffer circuits
- Single-supply audio designs
- Dual-supply audio designs
Procurement Notes
When requesting a quote for OPA1679, 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 OPA1679 include?
The OPA1679 is the quad-channel version and includes four amplifier channels. It is described as a Texas Instruments quad audio operational amplifier for Signal_Chain applications.
What supply ranges are recommended for OPA1679 operation?
Recommended operation supports a 4.5 V to 36 V single supply or ±2.25 V to ±18 V dual supplies. The absolute maximum supply voltage is 40 V.
Which package options are listed for the OPA1679?
The OPA1679 is listed in SOIC-14 (D), TSSOP-14 (PW), and QFN-16 (RUM) packages. The RUM QFN option includes an exposed thermal pad connected to V-.
What are the main audio performance parameters?
Key parameters include 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.