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Texas Instruments OPA134UA
- Part No.:
- OPA134UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA134UA.pdf
- Description:
- IC AUDIO 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,003
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Product details
Overview
OPA134UA from Texas Instruments is a single-channel, high-performance FET-input audio operational amplifier designed for low-distortion signal conditioning in professional and high-fidelity audio circuits. It delivers ultra-low THD+N (0.00008% at 1kHz), 8nV/√Hz input voltage noise, 20V/µs slew rate, and operates from ±2.5V to ±18V supplies - enabling use in line drivers, preamplifiers, and active filters where sonic integrity is critical.
For engineers reviewing the OPA134UA datasheet, OPA134UA pinout, OPA134UA application, or OPA134UA equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions for SOIC-8, confirmed audio-specific features, and two rigorously cross-checked alternative op-amps with documented functional trade-offs.
Technical Context
The OPA134UA employs a true JFET-input stage with 5pA typical input bias current and rail-to-rail output swing within 1V of both supply rails, enabling wide dynamic range in ±15V audio systems. Its unity-gain stability, 8MHz gain-bandwidth product, and low 0.01% settling time (1µs) support fast transient response in high-speed line-receiver and crossover-network applications.
Input cascode circuitry ensures excellent common-mode rejection (>100dB) across –12.5V to +11.5V VCM range while maintaining low distortion under varying source impedances. The device avoids phase reversal even when inputs exceed common-mode limits by >10V - a critical reliability feature absent in legacy audio op-amps like OP176.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| THD+N | 0.00008% at 1kHz, 3Vrms, 2kΩ load - enables transparent signal path in mastering-grade analog stages without audible coloration. |
| Slew Rate | 20V/µs - supports full-swing 20kHz sine wave at ≥10Vpp without slewing-induced distortion in line-level circuits. |
| Input Noise Density | 8nV/√Hz at 1kHz - lower than OP27 (10nV/√Hz) and comparable to OPA1612 (7.2nV/√Hz), critical for low-gain microphone preamp front-ends. |
| Open-Loop Gain | 120dB into 2kΩ - ensures <0.001% gain error in precision active filters and integrators over temperature. |
| Supply Range | ±2.5V to ±18V - allows direct drop-in replacement in legacy ±12V, ±15V, and modern ±5V audio systems without redesign. |
| Output Swing | Within 1.2V of rails (±13.8V @ ±15V supply) - delivers 21.3dBu headroom, exceeding AES17 reference level for professional line outputs. |
| CMRR | 100dB (typ) - rejects power-supply ripple and ground-loop interference in unbalanced line receivers. |
Pinout & Package
OPA134UA is packaged in an 8-pin SOIC (D package), surface-mount outline with standard pin spacing (1.27mm pitch) and thermal pad compatibility. Pin 1 is marked via notch or dot; device orientation follows JEDEC MS-012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect (NC) | Internally unconnected; must be left floating per TI specification - no tie to ground or supply. |
| 2 | Inverting Input (–IN) | Virtual ground node in inverting configurations; impedance matching required only if source >2kΩ in noninverting mode. |
| 3 | Noninverting Input (+IN) | High-impedance FET input (5pA IB); requires matched source impedance to –IN in noninverting amps to minimize distortion. |
| 4 | Negative Supply (V–) | Connect to lowest system rail; bypass with ≥10nF ceramic capacitor near pin to suppress PSRR degradation above 10kHz. |
| 5 | No Connect (NC) | Internally unconnected; must remain unconnected - not a thermal pad or ground tie. |
| 6 | Output (OUT) | Capable of sourcing 36mA/sinking 30mA; stable with ≥100pF capacitive loads when properly compensated. |
| 7 | Positive Supply (V+) | Connect to highest system rail; same bypassing requirement as V– for optimal THD+N performance. |
| 8 | No Connect (NC) | No internal connection; float per datasheet - no routing or stitching allowed. |
Key Features
| Feature | Design Value |
|---|---|
| True FET input stage | 5pA input bias current enables high-impedance sensor interfacing and eliminates thermal drift errors in passive filter networks. |
| No phase reversal | Operates safely beyond common-mode limits by >10V - prevents catastrophic latch-up in voltage-follower line receivers during signal transients. |
| Rail-to-rail output swing | Delivers 21.3dBu headroom at ±18V supply, meeting EBU R68 and SMPTE RP168 broadcast line-level standards. |
| Unity-gain stable | Eliminates need for external compensation in gain-of-1 buffers, reducing BOM count and PCB area in compact audio modules. |
| Low 1/f noise corner | Sub-10Hz 1/f corner frequency ensures flat noise floor in subsonic active crossovers and DC-coupled phono preamps. |
Applications
| Professional Audio Line Driver | Studio Preamplifier Front-End |
|---|---|
Use Scenario: Driving balanced XLR outputs from digital-to-analog converters in recording consoles. IC Role / Device Role / Timing Role: Voltage buffer with high output drive (36mA) and low THD+N to maintain SNR across 100m cable runs. Use Value: 21.3dBu headroom prevents clipping on transient peaks, while 8nV/√Hz noise preserves resolution of 24-bit/192kHz audio streams. |
Use Scenario: First amplification stage in condenser microphone preamplifiers with 120dB dynamic range. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain block with laser-trimmed offset (<±2mV) for DC-coupled signal paths. Use Value: 5pA input bias current avoids loading electret capsule impedance, and 0.00008% THD+N ensures no harmonic contamination below –120dBFS. |
| Active Crossover Network | High-Fidelity Multimedia Audio |
Use Scenario: Splitting full-range signals into band-limited channels for multi-driver loudspeaker systems. IC Role / Device Role / Timing Role: Precision active filter element (Butterworth, Linkwitz-Riley) with 8MHz GBW supporting steep 24dB/octave slopes. Use Value: 120dB open-loop gain ensures <0.001% passband ripple in 4th-order filters, preserving phase coherence between woofer/mid/tweeter bands. |
Use Scenario: Output stage in USB DACs and Bluetooth audio receivers targeting Hi-Res Audio certification. IC Role / Device Role / Timing Role: Final analog buffer before headphone or line-out jacks, delivering low-impedance drive to variable loads. Use Value: Stable operation into 32Ω headphones and 10kΩ line inputs without oscillation, verified up to 100pF capacitive loading per TI test data. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1612AID | Lower input voltage noise (1.1nV/√Hz), dual-channel, higher quiescent current (4.6mA/ch vs 4.5mA), 10MHz GBW. | Better for ultra-low-noise mic preamps; less suitable for high-output-drive line drivers due to 20mA max output current. | Select OPA1612AID when noise dominates design priority and channel count permits dual usage; retain OPA134UA for single-channel, high-output, cost-sensitive line stages. |
| NE5532AP | Bipolar input (200nA IB), higher THD+N (0.002%), 10V/µs slew rate, lower cost, wider temp range (–40°C to +85°C same). | Acceptable for consumer audio and non-critical mixing; unsuitable for mastering or high-resolution ADC/DAC interfaces. | Choose NE5532AP for cost-driven, non-audiophile applications where 0.002% THD+N is acceptable; OPA134UA remains preferred for professional signal chains requiring <0.0001% distortion. |
Compared with OPA1612AID and NE5532AP, the OPA134UA uniquely balances ultra-low distortion (0.00008%), FET-input impedance (5pA), and robust output drive (36mA) in a single-channel SOIC-8 package - making it the optimal choice for discrete, high-headroom audio buffer stages where channel independence and sonic transparency are mandatory.
Availability
OPA134UA is available at Aetrix Electronics and suitable for professional audio equipment, studio recording hardware, and high-fidelity multimedia devices requiring stable component supply and long-term production continuity.
Supply support for OPA134UA 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 over 50 years of innovation in precision amplifiers and signal chain solutions.
The OPAx134 series was engineered specifically for high-end audio applications demanding vanishingly low distortion, wide bandwidth, and exceptional DC accuracy - targeting professional recording, broadcast, and audiophile-grade consumer electronics.
FAQ
What is the maximum capacitive load the OPA134UA can drive without instability?
The OPA134UA is stable driving ≥100pF capacitive loads when configured as a unity-gain buffer with proper power supply bypassing (≥10nF ceramic per rail). TI's Figure 5-23 confirms stable small-signal response up to 1000pF with 24Ω series output resistance - but for direct capacitive loading without isolation, ≤100pF is recommended to ensure 0.1% settling without overshoot. This makes OPA134UA suitable for driving coaxial cables and ADC input capacitors in audio digitization paths.
Does the OPA134UA require external offset nulling in precision audio applications?
No - the OPA134UA uses laser-trimmed input offset voltage, guaranteeing ≤±3.5mV over temperature (–40°C to +85°C) with typical values <±1mV. Its 2μV/°C drift ensures <±0.2mV variation across a 100°C span, eliminating need for manual trim in line-level preamplifiers, active filters, and summing amplifiers where offset-induced DC error must stay below 100μV.
How does the OPA134UA's THD+N performance compare at different supply voltages?
THD+N remains consistently low across its full ±2.5V to ±18V range: 0.00008% at ±15V (1kHz, 3Vrms), 0.00015% at ±18V (same conditions), and <0.0005% even at ±5V. TI's Figure 5-3 shows flat distortion vs frequency up to 20kHz regardless of supply - confirming OPA134UA maintains sonic fidelity in battery-powered portable audio gear and high-voltage studio infrastructure alike.
Can the OPA134UA be used in single-supply audio circuits?
Yes - the OPA134UA operates from 5V to 36V single supply (per Section 5.3), with input common-mode range extending to (V–)+2.5V and output swing to (V–)+0.5V. For 5V systems, bias the input at 2.5V using resistive divider and AC-couple outputs; its rail-swing capability delivers 3.5Vpp into 2kΩ, sufficient for line-out stages in USB-powered DACs and portable mixers.
What thermal considerations apply to the OPA134UA in SOIC-8 packages?
In SOIC-8 (D package), the OPA134UA has a junction-to-ambient thermal resistance (RθJA) of 160°C/W. At 4.5mA quiescent current and ±15V supply, power dissipation is ~135mW - resulting in ~22°C junction rise above ambient. For continuous high-output operation, keep ambient <70°C or add copper pour under pin 4/7; TI's thermal data confirms safe operation up to +85°C ambient with standard 2-layer PCB layout.
OPA134UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SoundPlus™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- 8 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 4mA
- Current - Output / Channel:
- 35 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA134UA FAQ
1.How can I place an order for OPA134UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA134UA 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 OPA134UA reliable?
The price and inventory of OPA134UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA134UA is usually 5 days.
3.What payment methods are accepted for OPA134UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA134UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA134UA?
OPA134UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA134UA 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 OPA134UA?
For technical support, including OPA134UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA134UA requirements.
6.How does Aetrix verify that OPA134UA is sourced from the original manufacturer or authorized distributors?
All OPA134UA 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 OPA134UA meets industry standards.
7.What is the process for return or replacement of OPA134UA?
All OPA134UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA134UA, 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 OPA134UA part is unused and in its original packaging.
Return procedure for OPA134UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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