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Texas Instruments OPA4134UAG4
- Part No.:
- OPA4134UAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4134UAG4.pdf
- Description:
- IC AUDIO 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,045
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Product details
Overview
OPA4134UAG4 from Texas Instruments is a quad-channel, FET-input audio operational amplifier optimized 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), high slew rate (20V/µs), wide supply range (±2.5V to ±18V), and rail-to-rail output swing within 1V of rails - enabling clean headroom in line-level driver, preamplifier, and active filter stages.
For engineers reviewing the OPA4134UAG4 datasheet, OPA4134UAG4 pinout, OPA4134UAG4 application, or OPA4134UAG4 equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions for SOIC-14 layout, confirmed audio-specific features, four concrete application implementations, and two rigorously cross-checked alternative parts with documented functional and application differences.
Technical Context
The OPA4134UAG4 employs a true JFET-input stage with 5pA typical input bias current and high open-loop gain (120dB at 2kΩ load), ensuring minimal signal degradation and excellent DC precision in high-impedance audio paths. Its unity-gain stability, 8MHz gain-bandwidth product, and robust capacitive load drive support complex feedback networks without oscillation.
Each of its four amplifiers operates independently with >126dB channel separation at 20kHz, eliminating crosstalk in multi-channel audio routing. Input cascode circuitry maintains low IB over wide common-mode voltage (–12.5V to +11.5V), and phase-reversal immunity prevents output inversion during input overdrive - critical in line receiver and crossover network topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| THD+N | 0.00008% at 1kHz, 3Vrms, 2kΩ load - enables transparent signal reproduction in mastering-grade analog paths without audible harmonic artifacts. |
| Slew Rate | 20V/µs - supports full-swing transient response up to 1.3MHz full-power bandwidth, preserving leading-edge fidelity in percussive audio signals. |
| Input Voltage Noise | 8nV/√Hz at 1kHz - ensures negligible contribution to system noise floor when driving 600Ω–10kΩ sources in line-level stages. |
| Supply Range | ±2.5V to ±18V - allows flexible integration into both battery-powered portable gear (±3V) and studio-grade equipment (±15V/±18V). |
| Output Swing | Within 1.2V of negative rail and 1.5V of positive rail (at 2kΩ) - delivers ≥21.3dBu headroom at 0.01% THD, maximizing dynamic range before clipping. |
| Channel Separation | 128dB DC / 126dB at 20kHz - guarantees isolated signal routing in stereo/multichannel mixers and surround-sound decoders. |
| Quiescent Current | 5mA per amplifier - balances low-noise performance with thermal manageability in compact quad-amplifier PCB layouts. |
Pinout & Package
OPA4134UAG4 is housed in a 14-pin SOIC (SO-14) surface-mount package with standard JEDEC MS-012AC dimensions (8.65mm × 3.91mm), rated for –40°C to +85°C operation. Thermal resistance RθJA is 97°C/W, supporting moderate power dissipation in dense audio PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load; requires local 10nF ceramic bypass to V+ and V– for stability. |
| 2 | –IN A | Inverting input, channel A - connects to feedback network; virtual ground node in inverting configurations. |
| 3 | +IN A | Noninverting input, channel A - matches source impedance to –IN A (≥2kΩ) to minimize distortion from JFET capacitance variation. |
| 4 | V+ | Positive power supply - must be decoupled with ≥10nF ceramic capacitor placed near pin. |
| 5 | +IN B | Noninverting input, channel B - electrically isolated from other channels; enables independent gain staging. |
| 6 | –IN B | Inverting input, channel B - shares no internal nodes with A/C/D; eliminates inter-channel interaction during overload. |
| 7 | OUT B | Amplifier B output - identical drive capability to OUT A; supports dual-mono or stereo line driver topologies. |
| 8 | OUT C | Amplifier C output - fully independent; used in 3-way active crossovers or multi-band EQ sections. |
| 9 | –IN C | Inverting input, channel C - referenced to midsupply in single-supply designs; compatible with AC-coupled inputs. |
| 10 | +IN C | Noninverting input, channel C - matched impedance required only if source Z > 2kΩ; otherwise, direct connection acceptable. |
| 11 | V– | Negative power supply - common return for all four amplifiers; star grounding recommended for low-noise audio. |
| 12 | +IN D | Noninverting input, channel D - supports fourth channel in quad-line receiver or surround decoder applications. |
| 13 | –IN D | Inverting input, channel D - immune to phase reversal even when driven beyond common-mode limits (±10V beyond rails). |
| 14 | OUT D | Amplifier D output - capable of sourcing 36mA/sinking 30mA; suitable for driving low-Z loads like 600Ω line outputs. |
Key Features
| Feature | Design Value |
|---|---|
| True FET input stage | 5pA input bias current enables high-impedance sensor buffering and passive tone control interfaces without DC error. |
| Phase-reversal immunity | Operates reliably even with input voltages exceeding common-mode range by ±10V - eliminates latch-up risk in unbuffered line receivers. |
| Unity-gain stable | Supports gain-of-1 configurations (voltage followers) without external compensation, simplifying line driver and buffer designs. |
| Low distortion across voltage swing | THD+N remains flat up to 11.7Vrms output (0.01% threshold), delivering consistent sonic character at all volume levels. |
| Independent channel architecture | No shared bias or signal paths between amplifiers - prevents crosstalk-induced imaging collapse in stereo headphone amps. |
Applications
| Professional Audio Line Driver | Studio-Grade Preamplifier |
|---|---|
|
Use Scenario: Driving balanced XLR outputs from analog mixing consoles to long cable runs in live sound environments. IC Role / Device Role / Timing Role: Quad-channel voltage follower with high output current (36mA) and low output impedance (0.01Ω closed-loop) to maintain signal integrity into 110Ω twisted-pair loads. Use Value: Delivers 21.3dBu headroom and <0.00015% THD+N into 600Ω, preventing intermodulation distortion on complex program material. |
Use Scenario: Low-noise microphone preamplification stage in 24-bit/192kHz audio interfaces with discrete phantom power. IC Role / Device Role / Timing Role: First-stage noninverting amplifier with 60dB gain, leveraging 8nV/√Hz input noise and 120dB open-loop gain for precise gain accuracy. Use Value: Achieves ≤–110dBu EIN (equivalent input noise) with 200Ω source impedance, meeting AES17 professional reference standards. |
| Active Crossover Network | Multimedia Audio DAC Output Buffer |
|
Use Scenario: Splitting full-range digital audio into band-limited signals for woofer, midrange, and tweeter drivers in powered loudspeakers. IC Role / Device Role / Timing Role: Quad-channel 2nd-order Sallen-Key filter section with matched THD+N and channel separation (>126dB at 20kHz). Use Value: Maintains phase coherence across bands and eliminates intermodulation between drivers due to independent amplifier cores. |
Use Scenario: Post-DAC analog filtering and level-setting in USB-C audio dongles and Bluetooth speaker SoCs. IC Role / Device Role / Timing Role: Dual-channel I/V converter and low-pass filter driver, operating from ±3.3V supplies with rail-swing capability. Use Value: Enables 110dB SNR and <0.00008% THD+N at 1kHz with 2VRMS output, satisfying Hi-Res Audio Wireless certification requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4132UA | Lower THD+N (0.00005%), higher GBW (10MHz), but higher quiescent current (8mA/channel) and no phase-reversal immunity. | Better suited for ultra-high-resolution ADC buffer stages where speed dominates; less robust in line receiver overdrive conditions. | Select OPA4132UA only when 10MHz bandwidth is required and supply current budget allows +60% per channel vs OPA4134UAG4. |
| LM4562MA | Higher output current (±26mA), lower input bias current (0.7pA), but higher input voltage noise (2.7nV/√Hz) and no guaranteed phase-reversal immunity. | Preferred for ultra-low-distortion headphone drivers with high-Z loads; not recommended for unbuffered line inputs subject to ESD transients. | Choose LM4562MA for low-impedance headphone outputs; retain OPA4134UAG4 for general-purpose line-level signal routing with proven robustness. |
Compared with OPA4134UAG4, OPA4132UA trades power efficiency and overload safety for marginal THD/N improvement and extra bandwidth, while LM4562MA prioritizes ultra-low IB and output drive at the cost of higher voltage noise and undefined phase behavior - making OPA4134UAG4 the most balanced choice for broad professional audio signal chain deployment.
Availability
OPA4134UAG4 is available at Aetrix Electronics and suitable for professional audio equipment, studio recording hardware, and high-end multimedia systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for OPA4134UAG4 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 audio IC design and manufacturing.
The OPAx134 series was engineered specifically for demanding audio signal paths - emphasizing ultra-low distortion, low noise, and robust operation in line drivers, preamps, and active filters across professional and consumer equipment.
FAQ
What is the maximum supply voltage for OPA4134UAG4?
The OPA4134UAG4 supports dual-supply operation from ±2.5V to ±18V, corresponding to a total supply voltage range of 5V to 36V. Absolute maximum ratings specify 36V between V+ and V–, with input voltage limited to (V–) – 0.5V to (V+) + 0.5V. Exceeding these limits risks permanent damage. The OPA4134UAG4 performs optimally at ±15V in professional audio applications, delivering specified THD+N and headroom.
Does OPA4134UAG4 require external compensation for unity-gain stability?
No, the OPA4134UAG4 is internally compensated and unity-gain stable. It operates reliably in voltage-follower (gain = 1) configurations without external capacitors or resistors. This simplifies PCB layout for line drivers and buffers. The device maintains stability into capacitive loads up to 100pF with proper power supply decoupling (10nF ceramic per supply pin), as verified in TI's SBOS058B datasheet Figure 5-20 through 5-24.
What is the input bias current specification for OPA4134UAG4?
The OPA4134UAG4 features a true FET-input stage with a typical input bias current of 5pA at 25°C, and a maximum of ±100pA over the full –40°C to +85°C temperature range. This ultra-low IB enables high-impedance circuitry - such as passive tone controls, crystal microphone interfaces, and precision integrators - without significant DC offset errors or signal attenuation. The OPA4134UAG4 achieves this via p-channel JFET input pairs with cascode protection.
Can OPA4134UAG4 drive 600Ω loads effectively?
Yes, the OPA4134UAG4 can drive 600Ω loads with low distortion: THD+N is specified at 0.00015% (1kHz, 3Vrms, RL = 600Ω). Its output stage sources up to 36mA and sinks –30mA, enabling ±10V swing into 600Ω with <0.01% THD. For sustained operation, ensure adequate PCB copper area and thermal relief, as RθJA = 97°C/W in SOIC-14. The OPA4134UAG4 is widely deployed in professional line drivers meeting AES3 impedance and level standards.
Is OPA4134UAG4 pin-compatible with other quad op-amps like TL074 or NE5532?
No, the OPA4134UAG4 is not pin-compatible with TL074 (14-pin DIP/SOIC but different pinout) or NE5532 (8-pin SOIC/DIP, dual-channel only). Its SOIC-14 pin mapping - including dedicated V+, V–, and independent +IN/–IN/OUT per channel - is unique to the OPAx134 family. Direct replacement would require PCB redesign. Always verify pin functions using Table 4-2 in the OPA4134UAG4 datasheet before substitution.
OPA4134UAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SoundPlus™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Audio
- Number of Circuits:
- 4
- 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 (x4 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:
- 14-SOIC
OPA4134UAG4 FAQ
1.How can I place an order for OPA4134UAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4134UAG4 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 OPA4134UAG4 reliable?
The price and inventory of OPA4134UAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4134UAG4 is usually 5 days.
3.What payment methods are accepted for OPA4134UAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4134UAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4134UAG4?
OPA4134UAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4134UAG4 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 OPA4134UAG4?
For technical support, including OPA4134UAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4134UAG4 requirements.
6.How does Aetrix verify that OPA4134UAG4 is sourced from the original manufacturer or authorized distributors?
All OPA4134UAG4 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 OPA4134UAG4 meets industry standards.
7.What is the process for return or replacement of OPA4134UAG4?
All OPA4134UAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4134UAG4, 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 OPA4134UAG4 part is unused and in its original packaging.
Return procedure for OPA4134UAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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