OPA2134UA/2K5 - SoundPlus Dual Audio Op-Amp | Texas Instruments
MPN: OPA2134UA/2K5 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.5 | $3.50 |
| 10 | $3.2 | $32.00 |
| 100 | $2.85 | $285.00 |
| 500 | $2.4 | $1,200.00 |
| 1,000 | $2.1 | $2,100.00 |
Drop-in alternatives for OPA2134UA/2K5 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
OPA2132U/2K5
β Drop-Inπ Reference alternative (not in catalog)
LM4562MA/NOPB
β Drop-Inπ Reference alternative (not in catalog)
AD8620ARZ
β Drop-Inβ In Stock
$8.5 / Unit
View Datasheet βAD823ARZ
β Drop-Inβ In Stock
$4.34 / Unit
View Datasheet βTL072CDR
β Drop-Inπ Reference alternative (not in catalog)
OPA2134UA/2K5 Maximum Ratings & Electrical Characteristics
| Product Type | Audio Amplifier |
| Number of Circuits | 2 |
| Amplifier Type | Audio |
| Package / Case | 8-SOIC |
| Mounting Type | Surface Mount |
| Supply Voltage Range | +/-2.5 V to +/-18 V |
| Maximum Supply Voltage | +/-18 V |
| Input Bias Current | 5 pA (typical, FET input) |
| Voltage Noise Density | 8 nV/rtHz |
| Total Harmonic Distortion (THD) | 0.00008% |
| Slew Rate | 20 V/us |
| Gain Bandwidth Product | 8 MHz |
| Open-Loop Gain | 600 V/mV |
| Number of Channels | 2 |
| RoHS Status | unknown |
| Tape & Reel Quantity | 2500 |
| Operating Temperature | [DATA_NEEDED: Operating Temperature Range] |
| Quiescent Current | [DATA_NEEDED: Quiescent Current per Channel] |
| Output Current | [DATA_NEEDED: Short-Circuit Output Current] |
| Input Offset Voltage | [DATA_NEEDED: Input Offset Voltage] |
OPA2134UA/2K5 Pin Configuration
| Pin 1 | OUT A β Output of amplifier A |
| Pin 2 | -IN A β Inverting input of amplifier A |
| Pin 3 | +IN A β Non-inverting input of amplifier A |
| Pin 4 | V- β Negative supply voltage |
| Pin 5 | +IN B β Non-inverting input of amplifier B |
| Pin 6 | -IN B β Inverting input of amplifier B |
| Pin 7 | OUT B β Output of amplifier B |
| Pin 8 | V+ β Positive supply voltage |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
OPA2134UA/2K5 is suitable for 6 applications: High-End Audio DAC Output Buffer, Headphone Amplifier, Active Crossover and Equalizer, Microphone Preamplifier, Musical Instrument / Guitar Effects Processor, Audio Test and Measurement Instrumentation.
High-End Audio DAC Output Buffer
The OPA2134UA/2K5's 0.00008% distortion and 8 nV/rtHz noise make it an excellent output buffer after a high-performance audio DAC. Its true FET input presents a high impedance to the DAC's switched-capacitor or current-output stage, minimizing loading artifacts. In a typical circuit, the DAC's differential current output is converted to a voltage by an external I/V stage, and the OPA2134 buffers that signal for the next line stage. The 20 V/us slew rate keeps transient response fast while the wide +/-18 V supply range accommodates high-swing audio rails. Place 0.1 uF decoupling close to V+ and V- pins.
Recommended
Headphone Amplifier
For headphone amplifier line-driver stages, the OPA2134UA/2K5 offers the low distortion and high slew rate needed for transparent sound. In a 32-600 ohm headphone system, the op amp drives the line stage while a high-current buffer, such as the TPA6120A2, supplies output current to low-impedance cans. The FET input prevents loading of the volume-control potentiometer, and the dual-channel SOIC-8 package supports stereo layouts. Use supply decoupling and proper ground routing to keep THD at the datasheet's 0.00008% level.
Recommended
Active Crossover and Equalizer
The 8 MHz gain-bandwidth product and 20 V/us slew rate of the OPA2134UA/2K5 make it well suited for active crossover and equalizer circuits. In a Linkwitz-Riley or Butterworth filter, the op amp maintains low phase error across the audio band and drives feedback networks without gain-peaking. Because the FET input has only 5 pA bias current, filter nodes with high impedance are not loaded, preserving the calculated cutoff frequencies. Use metal-film resistors and film capacitors to keep distortion below 0.00008%.
Recommended
Microphone Preamplifier
In microphone preamp circuits, the OPA2134UA/2K5's 8 nV/rtHz noise and 5 pA input bias current preserve weak microphone signals while rejecting noise from high-impedance sources. The FET input is ideal for electret condenser microphones and piezo pickups that require very high input impedance. A typical circuit uses the OPA2134 as a non-inverting gain stage with a low-noise bias resistor, followed by an ADC such as the PCM1804 for digital conversion. Supply decoupling and a quiet ground plane are essential for best SNR.
Recommended
Musical Instrument / Guitar Effects Processor
The true FET input of the OPA2134UA/2K5 is the key reason it works well in guitar effects and instrument preamps. Passive pickups have high source impedance, and a bipolar-input op amp would load them and reduce tone quality. The 5 pA input bias current keeps the input impedance above tens of megohms, while the low 0.00008% distortion ensures the pedal remains transparent. In an analog effects loop, the OPA2134 can serve as a buffer, tone-control driver, or summing amplifier with +/-9 V to +/-18 V rails.
Recommended
Audio Test and Measurement Instrumentation
In audio analyzers and signal generators, the OPA2134UA/2K5 provides the low distortion and high linearity required to measure equipment without adding measurement error. Its 0.00008% THD keeps the test stimulus clean, while the 8 MHz bandwidth covers ultrasonic test signals. The dual SOIC-8 package is convenient for stereo balance or phase measurements. For high-accuracy dc-coupled tests, consider external offset trim or pair with a precision instrumentation amplifier. Bypass supply pins with low-ESR capacitors for stable operation.
Recommended
Recommended Products Summary
Engineering reference data for OPA2134UA/2K5 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OPA2132U/2K5 | AD8620ARZ | LM4562MA/NOPB |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments | Analog Devices | Texas Instruments |
| Number of Channels | 2 | 2 | 2 | 2 |
| Slew Rate | 20 V/us | 20 V/us | 11 V/us | 20 V/us |
| Gain Bandwidth Product | 8 MHz | 8 MHz | 50 MHz | 55 MHz |
| Input Bias Current | 5 pA | 5 pA | 5 pA | [DATA_NEEDED] |
| Voltage Noise Density | 8 nV/rtHz | 8 nV/rtHz | 6 nV/rtHz | 2.7 nV/rtHz |
| THD+N | 0.00008% | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- SoundPlus audio-optimized performance with 0.00008% distortion (vs OPA2132U/2K5)
- True FET input with 5 pA bias current (vs LM4562MA/NOPB)
- Balanced noise and distortion for audio signal chains (vs AD8620ARZ)
Design Notes
The OPA2134UA/2K5 requires clean analog supply rails. Bypass each supply pin (pin 8 V+ and pin 4 V-) with a 0.1 uF ceramic capacitor plus a 10 uF electrolytic close to the device. Because the op amp has an 8 MHz bandwidth, switching noise on the supply traces can couple into the audio path. A continuous low-impedance ground plane under the SOIC-8 package also improves PSRR and reduces distortion.
For the high-impedance FET input, keep traces to the non-inverting input short and place a guard trace around those nodes if they feed high-impedance sources. A solid ground plane is recommended, and the analog ground should be separated from digital/control ground to prevent ground-bounce from degrading THD. Avoid running input traces parallel to output traces to prevent parasitic coupling.
Do not exceed the absolute maximum supply voltage of +/-18 V. The OPA2134 is not a rail-to-rail op amp, so provide at least 1.5 V of headroom from each rail for linear operation. If only one amplifier in the dual package is used, tie the unused non-inverting input to ground and configure the amplifier as a unity-gain follower to prevent oscillation or noise injection.
Compliance Information
Compliance data was not explicitly provided in the verified web results. Confirm RoHS/REACH status from the TI datasheet or product page before high-volume use.
