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Texas Instruments OPA2134UA/2K5G4
- Part No.:
- OPA2134UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2134UA/2K5G4.pdf
- Description:
- IC AUDIO 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,524
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Product details
Overview
OPA2134UA/2K5G4 from Texas Instruments is a dual-channel, FET-input audio operational amplifier designed for high-fidelity signal conditioning in professional and consumer audio systems. It delivers ultra-low THD+N (0.00008% at 1kHz), low input voltage noise (8nV/√Hz), and high slew rate (20V/µs) while operating from ±2.5V to ±18V supplies. Its rail-to-rail output swing (within 1V of rails) enables wide dynamic range in line drivers and preamplifiers.
For engineers reviewing the OPA2134UA/2K5G4 datasheet, OPA2134UA/2K5G4 pinout, OPA2134UA/2K5G4 application, or OPA2134UA/2K5G4 equivalent, key selection criteria include distortion performance at 2kΩ load, channel separation (>128dB DC), input bias current (5pA typ), and SOIC-8 package compatibility with legacy audio PCB layouts.
Technical Context
The OPA2134UA/2K5G4 implements a true JFET-input stage with cascoded architecture to maintain ultra-low input bias current (5pA) across its full common-mode range (–12.5V to +11.5V), minimizing distortion in noninverting configurations. Its unity-gain stable design supports direct use in gain-of-1 buffers without external compensation.
Each channel operates independently-no crosstalk degradation occurs under overload or short-circuit conditions. The device achieves 8MHz gain-bandwidth product and 1.3MHz full-power bandwidth into 2kΩ, enabling accurate reproduction of transient-rich audio signals up to 20kHz with <0.01% THD+N headroom of 21.3dBu.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| THD+N | 0.00008% at 1kHz, 3Vrms, 2kΩ load - ensures audibly transparent amplification with no measurable harmonic artifacts |
| Slew Rate | 20V/µs - supports clean transient response for fast audio waveforms without slewing-induced distortion |
| Input Voltage Noise | 8nV/√Hz at 1kHz - preserves signal integrity in low-level microphone and phono preamp stages |
| Input Bias Current | 5pA typical - enables high-impedance sensor interfacing and minimizes DC error in passive filter networks |
| Open-Loop Gain | 120dB at 2kΩ load - provides high loop gain for precise DC accuracy and low closed-loop error |
| Channel Separation | 128dB at DC, 126dB at 20kHz - prevents audible crosstalk between stereo channels in dual-amplifier configurations |
| Supply Range | ±2.5V to ±18V - supports flexible system integration from battery-powered portable gear to studio-grade powered mixers |
Pinout & Package
OPA2134UA/2K5G4 is housed in an 8-pin SOIC (SO-8) surface-mount package with standard pin spacing (1.27mm pitch) and exposed pad thermal enhancement per TI's D-package specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 3) | Noninverting input, Channel A | High-impedance FET node for signal reference in buffer or noninverting amplifier topologies |
| –IN A (Pin 2) | Inverting input, Channel A | Virtually grounded node in inverting configurations; matched impedance critical for low distortion |
| OUT A (Pin 1) | Output, Channel A | Capable of sourcing 36mA/sinking 30mA; swings within 1.5V of rails into 2kΩ load |
| V– (Pin 4) | Negative power supply | Reference for dual-supply operation; must be bypassed with ≥10nF ceramic capacitor near pin |
| +IN B (Pin 5) | Noninverting input, Channel B | Independent high-Z input for stereo or dual-path signal processing without interaction |
| –IN B (Pin 6) | Inverting input, Channel B | Separate feedback node enabling independent gain setting per channel |
| OUT B (Pin 7) | Output, Channel B | Fully isolated output stage; maintains >126dB separation even when one channel is overloaded |
| V+ (Pin 8) | Positive power supply | Primary supply rail; shared by both amplifiers but internally decoupled for low crosstalk |
Key Features
| Feature | Design Value |
|---|---|
| True FET input stage | 5pA input bias current enables high-Z source interfacing without DC offset drift or loading errors |
| No phase reversal | Operates safely beyond common-mode limits (±10V beyond rails) - eliminates latch-up risk in follower circuits |
| Rail-to-rail output swing | Output reaches within 1.5V of V+ and V– into 2kΩ - maximizes usable dynamic range in ±15V systems |
| Unity-gain stable | Requires no external compensation for G = 1 configurations - simplifies layout and reduces component count |
| Low-noise spectral density | 8nV/√Hz voltage noise + 3fA/√Hz current noise - optimal for sources from 10Ω to 100kΩ |
Applications
| Professional Line Driver | Studio Preamplifier |
|---|---|
Use Scenario: Driving balanced 600Ω analog audio lines over 10m cable runs in broadcast consoles. IC Role / Device Role / Timing Role: Dual-channel voltage buffer with high output drive and low THD+N to preserve signal fidelity across long interconnects. Use Value: 0.00015% THD+N into 600Ω load ensures negligible harmonic contamination; 20V/µs slew rate prevents transient smearing. |
Use Scenario: Low-noise gain stage for condenser microphone signals in recording interfaces. IC Role / Device Role / Timing Role: First-stage preamplifier with ultra-low input voltage noise (8nV/√Hz) and 5pA bias current to avoid capsule loading. Use Value: Enables >110dB SNR in 20Hz–20kHz band; laser-trimmed offset (<±3.5mV) minimizes DC blocking capacitor size. |
| Active Crossover Network | Multimedia Audio DAC Output Stage |
Use Scenario: Splitting full-range digital audio into band-limited signals for multi-driver loudspeakers. IC Role / Device Role / Timing Role: Dual-channel active filter section implementing 24dB/octave Linkwitz-Riley response with matched channel characteristics. Use Value: >128dB channel separation prevents imaging collapse; 8MHz GBW ensures flat group delay up to 20kHz. |
Use Scenario: Post-DAC analog reconstruction and volume control in USB-C audio dongles and smart speakers. IC Role / Device Role / Timing Role: Single-supply (5V–36V) I/V converter and headphone driver with rail-swing capability. Use Value: Output swing to within 1.2V of rails supports 2.5Vpp DAC outputs; 4mA quiescent current per amp enables battery longevity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2134P | Same silicon, PDIP-8 through-hole package; higher RθJA (71°C/W vs 160°C/W for SOIC); no exposed thermal pad | Preferred for prototyping, breadboarding, or legacy through-hole PCBs where reflow is unavailable | Select OPA2134P only when manual soldering or socket-based testing is required; SOIC-8 (OPA2134UA/2K5G4) is superior for production thermal management. |
| OPA2227UA | Bipolar input (vs FET); higher input bias current (10nA vs 5pA); lower voltage noise (3nV/√Hz) but higher current noise (1.2pA/√Hz) | Better suited for low-source-impedance precision instrumentation; less ideal for high-Z audio sensors or passive tone controls | Choose OPA2227UA only when ultra-low voltage noise dominates design priority and source impedances remain <1kΩ. |
Compared with OPA2134P and OPA2227UA, the OPA2134UA/2K5G4 uniquely balances ultra-low THD+N, FET-input impedance, and SOIC-8 manufacturability-making it the default choice for production audio PCBs requiring both fidelity and thermal reliability.
Availability
OPA2134UA/2K5G4 is available at Aetrix Electronics and suitable for professional audio equipment, studio recording interfaces, and high-end multimedia systems requiring stable component supply and long-term obsolescence management.
Supply support for OPA2134UA/2K5G4 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-performance op amp design.
The OPAx134 family was engineered specifically for demanding audio signal chains-prioritizing ultra-low distortion, low noise, and robust DC precision over general-purpose specifications.
FAQ
What is the maximum output voltage swing of the OPA2134UA/2K5G4 into a 2kΩ load?
The OPA2134UA/2K5G4 delivers a minimum output swing of (V+) – 1.5V on the positive rail and (V–) + 1.2V on the negative rail into a 2kΩ load. At ±15V supplies, this yields a usable linear output range of ±13.5V, supporting 21.3dBu headroom before THD+N exceeds 0.01%. This rail proximity enables high dynamic range in line-level audio stages without clipping.
Does the OPA2134UA/2K5G4 require external compensation for unity-gain stability?
No, the OPA2134UA/2K5G4 is internally compensated for unity-gain stability. It can be used directly in voltage-follower, noninverting, or inverting configurations with G ≥ 1 without adding external capacitors or resistors. This simplifies circuit design and improves layout robustness, especially in compact audio PCBs where stray capacitance could destabilize uncompensated amplifiers.
How does the OPA2134UA/2K5G4 handle input common-mode voltage violations?
The OPA2134UA/2K5G4 features built-in phase-reversal protection and operates safely even when inputs exceed the specified common-mode range (–12.5V to +11.5V) by up to ±10V. Unlike many FET-input op amps, it avoids output polarity inversion or latch-up during overvoltage transients-critical for reliability in microphone preamps and line receivers exposed to ESD or hot-plug events.
What is the thermal resistance (RθJA) of the OPA2134UA/2K5G4 in its SOIC-8 package?
The OPA2134UA/2K5G4 in the SOIC-8 (D) package has a junction-to-ambient thermal resistance (RθJA) of 160°C/W under standard JEDEC test conditions (single-layer board, 1in² copper). This value assumes proper PCB thermal design: 2oz copper, thermal vias under the exposed pad, and adequate ground plane area. For continuous 5mA per amplifier operation, temperature rise remains within safe limits at ambient ≤70°C.
Can the OPA2134UA/2K5G4 drive capacitive loads without oscillation?
Yes, the OPA2134UA/2K5G4 is characterized for stable operation with capacitive loads up to 100pF when using appropriate series output resistance (e.g., 24Ω or 51Ω). Figure 5-23 in the datasheet confirms <5% overshoot at 100pF with ROUT = 24Ω. For larger loads (e.g., >500pF), add a small isolation resistor (10–50Ω) in series with the output to maintain phase margin and prevent peaking.
OPA2134UA/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SoundPlus™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Audio
- Number of Circuits:
- 2
- 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 (x2 Channels)
- 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
OPA2134UA/2K5G4 FAQ
1.How can I place an order for OPA2134UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2134UA/2K5G4 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 OPA2134UA/2K5G4 reliable?
The price and inventory of OPA2134UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2134UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA2134UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2134UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2134UA/2K5G4?
OPA2134UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2134UA/2K5G4 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 OPA2134UA/2K5G4?
For technical support, including OPA2134UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2134UA/2K5G4 requirements.
6.How does Aetrix verify that OPA2134UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA2134UA/2K5G4 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 OPA2134UA/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA2134UA/2K5G4?
All OPA2134UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2134UA/2K5G4, 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 OPA2134UA/2K5G4 part is unused and in its original packaging.
Return procedure for OPA2134UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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