OPA2134UA/2K5 - Dual Audio Op-Amp 0.00008% THD | TI
MPN: OPA2134UA/2K5 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.65 | $2.65 |
| 10 | $2.38 | $23.80 |
| 100 | $2.05 | $205.00 |
| 500 | $1.82 | $910.00 |
| 1,000 | $1.62 | $1,620.00 |
| 2,500 | $1.45 | $3,625.00 |
OPA2134UA/2K5 Overview
An audio operational amplifier is a precision linear amplifier optimized to pass audio-band signals with minimal added harmonic distortion, noise, and phase error. It sits in the analog signal chain between transducers, DACs, and loudspeakers, and is a specialized subclass of the general op amp: an audio op amp is a linear amplifier within the analog signal processing chain of consumer, professional, and automotive audio electronics.
Key features include the 0.00008% total harmonic distortion figure that keeps the device transparent in the audible signal path, 8 nV/rtHz voltage noise for low hiss in high-gain stages, and 5 pA FET input bias current that prevents loading of high-impedance sources such as guitar pickups and passive EQ networks. The 8 MHz bandwidth and 20 V/us slew rate preserve full-power performance across the entire 20 Hz to 20 kHz audio band, and the wide +/-18 V supply range matches standard professional audio rails.
Architecturally, the OPA2134 uses a true FET input stage with a high open-loop gain of 600 V/mV (per TI datasheet), delivering excellent DC precision alongside audio-grade AC performance. The dual-channel SOIC-8 configuration enables compact stereo designs without performance compromise, and the single (OPA134) and quad (OPA4134) family members share identical core specifications for BOM flexibility.
Typical applications include audio DAC output buffering (I/V conversion), line drivers, active crossovers, microphone preamplifiers, and audio test instrumentation, where the OPA2134UA/2K5 is often the limiting factor in signal purity.
Design tip: bypass each supply pin with a 0.1 uF ceramic capacitor placed close to the package, and maintain adequate input/output headroom since this is not a rail-to-rail op amp. Prices as of 2026-08-30.
Drop-in alternatives for OPA2134UA/2K5 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with OPA2134UA/2K5 (same form factor and footprint) — differing in Slew Rate, Amplifier Type, Package, Supply Voltage Range, Gain Bandwidth Product.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
OPA2134UA/2K5
✅ Drop-In✓ In Stock
$0.92 / Unit
View Datasheet →OPA2134UA
✅ Drop-In📋 Reference alternative (not in catalog)
OPA2132UA
✅ Drop-In📋 Reference alternative (not in catalog)
OPA2131UA/2K5G4
✅ Drop-In📋 Reference alternative (not in catalog)
AD823AN
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
OPA2134UA/2K5 Maximum Ratings & Electrical Characteristics
| Amplifier Type | Audio Operational Amplifier (SoundPlus) |
| Number of Channels | 2 |
| Total Harmonic Distortion | 0.00008% |
| Input Voltage Noise | 8 nV/rtHz |
| Input Bias Current | 5 pA (FET input) |
| Slew Rate | 20 V/us |
| Gain-Bandwidth Product | 8 MHz |
| Open-Loop Gain | 600 V/mV |
| Supply Voltage Range | +/-2.5 V to +/-18 V |
| Input Type | True FET (JFET) |
| Operating Temperature | -40C to +85C |
| Package | 8-SOIC |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel, 2500 units |
OPA2134UA/2K5 Pin Configuration
| Pin 1 | OUT A — Output of channel A |
| Pin 2 | IN A- — Inverting input, channel A |
| Pin 3 | IN A+ — Non-inverting input, channel A |
| Pin 4 | V- — Negative supply |
| Pin 5 | IN B+ — Non-inverting input, channel B |
| Pin 6 | IN B- — Inverting input, channel B |
| Pin 7 | OUT B — Output of channel B |
| Pin 8 | V+ — Positive supply |
Typical Applications
OPA2134UA/2K5 is suitable for 6 applications: Audio DAC Output Buffering (I/V Conversion), Microphone Preamplifiers, Active Crossovers and Line Drivers, Guitar Effects and Instrument Interfaces, Audio Test and Measurement Instrumentation, Automotive Audio Signal Processing.
Audio DAC Output Buffering (I/V Conversion)
The OPA2134UA/2K5 is a proven I/V converter for audio DACs: its FET input draws only 5 pA, so it does not disturb the DAC current output, and its 0.00008% THD ensures the buffer adds no measurable harmonic coloration. With 8 MHz gain-bandwidth, loop gain remains high across the audio band, preserving linearity. Placed directly after the DAC with a suitable feedback resistor, it converts current to voltage with minimal noise contribution from the 8 nV/rtHz input.
Recommended
Microphone Preamplifiers
In mic preamps, the OPA2134UA/2K5's 8 nV/rtHz input voltage noise keeps self-noise below the capsule's thermal noise at typical gains of 30 to 60 dB. The 5 pA FET bias current allows use with high-value bias and network resistors without DC error. Its +/-18 V supply compatibility provides wide dynamic range headroom for hot input signals, and the 20 V/us slew rate handles fast transients without slewing distortion.
Recommended
Active Crossovers and Line Drivers
Professional active crossovers run on +/-15 V or +/-18 V rails, which the OPA2134UA/2K5 accepts directly. The dual-channel SOIC-8 integrates both channels of a stereo filter section, cutting BOM size. Its 0.00008% THD keeps crossover summation transparent, and the high output drive capability specified in the OPAx134 datasheet drives long console cabling through a simple output network. The 8 MHz bandwidth ensures filter accuracy near crossover points.
Recommended
Guitar Effects and Instrument Interfaces
Guitar pickups present very high source impedance, where bipolar op amps load the signal and dull the tone. The OPA2134UA/2K5's true FET input with 5 pA bias current preserves pickup frequency response and dynamics, making it a favorite in pedals and audio interfaces. Its +/-18 V tolerance also permits higher internal pedal rails for increased headroom before clipping, and its low distortion maintains clean-boost transparency.
Recommended
Audio Test and Measurement Instrumentation
Audio analyzers and measurement front-ends require amplifiers whose own distortion does not mask the device under test. With 0.00008% THD (-122 dB) and 8 nV/rtHz noise, the OPA2134UA/2K5 serves as a low-distortion input buffer or gain stage in analyzer front ends. The 600 V/mV open-loop gain maintains gain accuracy in precision non-inverting configurations, supporting repeatable, calibrated measurements.
Recommended
Automotive Audio Signal Processing
For automotive amplifiers and infotainment requiring AEC-Q100-qualified analog front ends, the pin-compatible OPA2134UA/2K5-Q1 variant provides the same FET-input audio performance with automotive qualification. Wide +/-18 V capability accommodates load-dump-conditioned rails in head units and external amps. The 20 V/us slew rate and 8 MHz bandwidth handle full-scale audio with margin in electrically noisy vehicle environments.
Recommended
Recommended Products Summary
Engineering reference data for OPA2134UA/2K5 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OPA2134UA/2K5-Q1 | OPA2134UA | OPA2132UA | AD823AN | OPA2134P |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-PDIP - different footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Texas Instruments |
| Automotive Grade (AEC-Q100) | No | Yes | No | No | No | No |
Key Differentiators
- Ultra-low distortion 0.00008% THD (vs AD823AN)
- True FET input with 5 pA bias current (vs NE5532-class bipolar op amps)
- Wide +/-18 V supply range (vs OPA2375IPWR)
- Automotive-qualified drop-in available (vs OPA2134UA/2K5-Q1)
Design Notes
Bypass each supply pin with a 0.1 uF ceramic capacitor placed within 3 mm of pins 4 (V-) and 8 (V+), plus a 10 uF bulk capacitor per rail. The OPA2134 is stable in unity gain, but long feedback traces add parasitic capacitance; keep the feedback resistor path short to protect phase margin and prevent high-frequency peaking near the 8 MHz unity-crossover.
The OPA2134 is NOT rail-to-rail. Input common-mode range and output swing stop several volts from each rail depending on load. At 5 V single supply, usable swing is severely limited and clipping occurs easily. Verify headroom for expected signal amplitude plus margin, or select a rail-to-rail part such as the OPA2375 for low-voltage designs.
With +/-18 V supplies and a light audio load, quiescent dissipation in the dual SOIC-8 is modest but non-trivial: 8 mA class quiescent current at 36 V total is roughly [DATA_NEEDED: Iq value] mW, handled by theta_JA of the SOIC-8 without heatsinking. Avoid driving heavy capacitive loads or sustained high output current into low-impedance loads, which raises die temperature.
In I/V converter duty after a DAC, use a feedback capacitor across the feedback resistor to stabilize the loop against DAC output capacitance and set bandwidth just above the audio band (e.g., 100 kHz corner) to limit wideband noise integration while preserving 20 Hz-20 kHz fidelity.
Compliance Information
RoHS/lead-free per TI standard SOIC-8 offering. Not AEC-Q100 qualified - use OPA2134UA/2K5-Q1 for automotive. Formal REACH and halogen-free declarations require the latest TI product page certificates.
