My Inquiry
My Account
Texas Instruments OPA1679IRUMT
- Part No.:
- OPA1679IRUMT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
OPA1679IRUMT.pdf
- Description:
- IC AUDIO 4 CIRCUIT 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,788
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA1679IRUMT from Texas Instruments is a quad-channel, rail-to-rail output audio operational amplifier optimized for high-fidelity signal conditioning in professional and automotive audio systems. It delivers 4.5 nV/√Hz input voltage noise at 1 kHz, 0.0001% THD+N at 1 kHz with 2-kΩ load, and 114 dB open-loop gain - enabling low-noise preamplification, line driver, and active filter stages in A/V receivers and external amplifiers.
For engineers reviewing the OPA1679IRUMT datasheet, OPA1679IRUMT pinout, OPA1679IRUMT application, or OPA1679IRUMT equivalent, this page provides verified specifications, QFN-16 package layout guidance, channel-isolated performance data, and validated alternatives for audio-grade op amp selection across supply ranges from ±2.25 V to ±18 V.
Technical Context
The OPA1679IRUMT uses a folded-cascode input stage paired with a Class AB rail-to-rail output stage, delivering unity-gain stability and low distortion across wide supply voltages. Its independent per-channel biasing eliminates crosstalk (–130 dB at 1 kHz) and prevents inter-channel interaction during overload.
Phase-reversal protection ensures output clamping-not inversion-when inputs exceed common-mode range (VCM = (V−) + 0.5 V to (V+) − 2 V), while internal ESD protection meets ±2000-V HBM and ±1000-V CDM standards without requiring external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise density | 4.5 nV/√Hz at 1 kHz - enables microphone preamp gain stages with <−110 dBu input-referred noise floor |
| THD+N | 0.0001% at 1 kHz, 3 VRMS, 2-kΩ load - preserves harmonic integrity in critical audio paths |
| Open-loop gain | 114 dB - supports precise DC-coupled gain accuracy and low-error active filters |
| Slew rate | 9 V/μs - sustains full-swing transient response up to 1.4 MHz at 1 VP |
| Supply range | ±2.25 V to ±18 V (or 4.5 V to 36 V) - interoperable with legacy analog audio rails and modern low-voltage DSP interfaces |
| Quiescent current | 2 mA per channel - allows four-channel operation at <8 mA total, suitable for thermally constrained PCBs |
| Channel separation | –130 dB at 1 kHz - prevents audible crosstalk in multi-channel mixer summing and routing |
Pinout & Package
The OPA1679IRUMT is housed in a 16-pin QFN package (RUM) with exposed thermal pad, measuring 3 mm × 3 mm × 0.8 mm. The thermal pad must be soldered to V− for specified thermal performance (RθJA = 38.5°C/W) and stable output swing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 6, 7, 14 | OUT A/B/C/D | Four independent rail-to-rail output terminals - each capable of sourcing/sinking ≥25 mA into 2-kΩ load |
| 2, 5, 8, 12 | –IN A/B/C/D | Inverting inputs - high-impedance (6 GΩ || 2 pF common-mode) for precision feedback networks |
| 3, 4, 9, 11 | +IN A/B/C/D | Noninverting inputs - matched bias current (±10 pA typ.) enables balanced differential input configurations |
| 10 | V− | Negative supply rail - connects to thermal pad; required reference for all channel outputs and bias circuitry |
| 3 | V+ | Positive supply rail - supplies internal bias generators and output stage; decoupling recommended within 1 cm |
| 13, 16 | NC | No-connect pins - electrically isolated; must remain unconnected per TI design validation |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Within 800 mV of both rails at 2-kΩ load - maximizes dynamic range in single-supply audio interfaces |
| Phase-reversal protection | Output clamps to rail instead of inverting when inputs exceed VCM limits - prevents catastrophic signal corruption in overdriven mixer stages |
| Independent channel architecture | No shared bias or current sources between channels - eliminates intermodulation distortion and crosstalk in multi-channel summing amps |
| Wide supply compatibility | Operates from ±2.25 V to ±18 V - supports both battery-powered portable gear and high-headroom studio equipment without redesign |
| Low 1/f noise | 1.74 µVPP (0.1 Hz to 10 Hz) - critical for DC-coupled phono preamps and low-frequency instrument amplification |
Applications
| Professional Microphone Preamp | Multi-Channel Audio Mixer |
|---|---|
Use Scenario: Low-noise gain staging for condenser microphones in recording consoles and wireless mic receivers. IC Role / Device Role / Timing Role: Quad-channel transimpedance and line-driver amplifier providing simultaneous phantom power isolation, gain, and balanced output buffering. Use Value: 4.5 nV/√Hz noise density and 0.0001% THD+N preserve subtle vocal harmonics and transient detail across all four channels without channel coupling. |
Use Scenario: Channel summing, level control, and bus driving in analog control surfaces and digital audio workstations with analog I/O. IC Role / Device Role / Timing Role: Four independent unity-gain stable buffers isolating fader outputs and feeding master bus amplifiers. Use Value: –130 dB channel separation at 1 kHz prevents bleed between adjacent channels during aggressive EQ or compression processing. |
| Guitar Effects Processor | Automotive External Amplifier |
Use Scenario: Signal conditioning in multi-FX loop pedalboards and modeling amplifiers requiring true-bypass-capable analog paths. IC Role / Device Role / Timing Role: Quad op amp implementing active tone stack, buffer, and output driver with DC-coupled signal chain. Use Value: Rail-to-rail output swing (within 800 mV) and 9 V/μs slew rate maintain clean transient response on distorted guitar signals up to 10 kHz. |
Use Scenario: Input stage and active crossover filtering in OEM and aftermarket 4-channel car amplifiers. IC Role / Device Role / Timing Role: Quad-channel line receiver and high-pass/low-pass filter driver before Class D output stages. Use Value: ±2.25 V to ±18 V dual-supply operation matches vehicle battery and alternator voltage fluctuations while maintaining 114 dB open-loop gain for accurate filter slopes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1679IDR | SOIC-14 package, RθJA = 90°C/W vs. 38.5°C/W for RUM; no thermal pad; larger footprint | Preferred for prototyping and through-hole assembly; less suitable for space-constrained automotive modules | Select OPA1679IDR when board real estate permits and thermal management via copper pour suffices |
| OPA1678IRUGR | Dual-channel version in 8-pin SON-8 (RUG); shares same noise/distortion specs but half channel count | Used where only two high-performance channels needed - e.g., stereo headphone amp or dual-mic interface | Choose OPA1678IRUGR to reduce BOM cost and layout complexity when quad functionality is unnecessary |
Compared with OPA1679IDR and OPA1678IRUGR, the OPA1679IRUMT offers superior thermal performance in minimal area and native four-channel integration - eliminating inter-device matching variance and reducing PCB trace length in multi-channel audio routing.
Availability
OPA1679IRUMT is available at Aetrix Electronics and suitable for professional microphone preamplifiers, multi-channel audio mixers, and automotive external amplifiers requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for OPA1679IRUMT 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-precision op amp design and audio signal chain innovation.
The OPA167x family was developed specifically for professional and high-end consumer audio applications demanding ultra-low noise, vanishingly low distortion, and robust channel isolation - targeting microphone preamps, mixing consoles, and automotive infotainment systems.
FAQ
What is the maximum capacitive load the OPA1679IRUMT can drive stably?
The OPA1679IRUMT maintains stable operation with up to 100 pF capacitive load in unity-gain configuration, as confirmed 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 (≥10 Ω) is recommended to preserve bandwidth and transient fidelity in the OPA1679IRUMT.
Does the OPA1679IRUMT support single-supply operation?
Yes, the OPA1679IRUMT operates from a single 4.5 V to 36 V supply, as specified in Section 6.3 Recommended Operating Conditions. Its rail-to-rail output stage and input common-mode range extending to within 0.5 V of V− enable true single-supply use in 5 V or 12 V audio systems without level-shifting circuitry - a key capability confirmed for the OPA1679IRUMT across temperature and supply variations.
How is thermal performance affected if the exposed pad of the OPA1679IRUMT is not soldered?
Leaving the thermal pad of the OPA1679IRUMT unsoldered increases junction-to-ambient thermal resistance from 38.5°C/W to >100°C/W, risking thermal shutdown or accelerated parameter drift above 70°C ambient. TI's datasheet explicitly requires soldering the pad to V− to achieve rated performance - this is a mandatory design requirement for the OPA1679IRUMT, not optional layout guidance.
Can the OPA1679IRUMT replace the OPA1612 in an existing design?
The OPA1679IRUMT is not a drop-in replacement for the OPA1612 due to differing pinouts (QFN-16 vs SOIC-8), channel count (quad vs dual), and supply current (2 mA/channel vs 2.6 mA/channel). While both offer low noise (<5 nV/√Hz), the OPA1679IRUMT adds phase-reversal protection and wider supply range - but requires PCB redesign and firmware-level channel mapping updates.
What is the input bias current specification for the OPA1679IRUMT over temperature?
The OPA1679IRUMT specifies ±10 pA typical input bias current at 25°C, with variation bounded by ±1500 pA from –40°C to +125°C (Figure 6-18). This ultra-low, temperature-stable bias current enables high-impedance sensor interfaces and passive RC filter networks without significant DC error - a verified characteristic of the OPA1679IRUMT across its full operating range.
OPA1679IRUMT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 4
- 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 (x4 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WQFN (4x4)
OPA1679IRUMT FAQ
1.How can I place an order for OPA1679IRUMT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1679IRUMT 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 OPA1679IRUMT reliable?
The price and inventory of OPA1679IRUMT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1679IRUMT is usually 5 days.
3.What payment methods are accepted for OPA1679IRUMT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1679IRUMT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1679IRUMT?
OPA1679IRUMT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1679IRUMT 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 OPA1679IRUMT?
For technical support, including OPA1679IRUMT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1679IRUMT requirements.
6.How does Aetrix verify that OPA1679IRUMT is sourced from the original manufacturer or authorized distributors?
All OPA1679IRUMT 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 OPA1679IRUMT meets industry standards.
7.What is the process for return or replacement of OPA1679IRUMT?
All OPA1679IRUMT units undergo pre-shipment inspection (PSI). If there is an issue with OPA1679IRUMT, 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 OPA1679IRUMT part is unused and in its original packaging.
Return procedure for OPA1679IRUMT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA1679IRUMT Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
