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Texas Instruments OPA134UA/2K5G4
- Part No.:
- OPA134UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA134UA/2K5G4.pdf
- Description:
- IC AUDIO 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,590
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Product details
Overview
OPA134UA/2K5G4 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 0.00008% THD+N at 1kHz, 8nV/√Hz input voltage noise, 20V/µs slew rate, ±2.5V to ±18V dual-supply operation, and rail-to-rail output swing within 1V of supply rails - enabling clean headroom in line-level preamplifier and active filter stages.
For engineers reviewing the OPA134UA/2K5G4 datasheet, OPA134UA/2K5G4 pinout, OPA134UA/2K5G4 application, or OPA134UA/2K5G4 equivalent, key selection criteria include ultra-low distortion performance under 2kΩ load, true FET-input bias current (5pA), unity-gain stability, absence of phase reversal, and SOIC-8 packaging compatibility with standard audio PCB layouts.
Technical Context
The OPA134UA/2K5G4 implements a fully differential, cascoded JFET input stage that maintains ultra-low input bias current (5pA) and high common-mode rejection (>90dB) across its full ±13.5V input voltage range. Its composite gain stage enables 8MHz gain-bandwidth product and 120dB open-loop gain at 2kΩ load while remaining unity-gain stable.
Internal thermal shutdown and current limiting protect against overload, and its output drives ≥36mA sourcing / ≥30mA sinking into capacitive loads up to 100pF without instability - verified by step-response testing and closed-loop impedance characterization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| THD+N | 0.00008% at 1kHz, 3Vrms, 2kΩ load - ensures audibly transparent signal path in critical gain stages |
| Slew Rate | 20V/µs - supports full-swing transient response up to 1.3MHz without slewing distortion |
| Input Voltage Noise | 8nV/√Hz at 1kHz - preserves SNR in low-source-impedance microphone and line-level interfaces |
| Input Bias Current | 5pA - minimizes DC error and offset drift in high-impedance sensor and passive-filter networks |
| Supply Range | ±2.5V to ±18V - enables flexible power architecture in both portable and studio-grade equipment |
| Output Swing | Within 1V of rails at 2kΩ - delivers >21dBu headroom for 0.01% THD+N, extending dynamic range |
| Open-Loop Gain | 120dB at 2kΩ - ensures precise DC accuracy and loop stability in precision integrators and active crossovers |
Pinout & Package
OPA134UA/2K5G4 is housed in an 8-pin SOIC (SO-8) surface-mount package with standard pinout and 1.27mm pitch. Thermal resistance is RθJA = 160°C/W, supporting operation from –40°C to +85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect | Internally unconnected; must be left floating per TI specification |
| 2 | Inverting Input (–IN) | Differential input node; virtual ground in inverting configurations |
| 3 | Noninverting Input (+IN) | Differential input node; matched impedance required >2kΩ for minimal distortion |
| 4 | Negative Supply (V–) | Low-side power rail connection; decoupling capacitor required |
| 5 | No Connect | Internally unconnected; must be left floating per TI specification |
| 6 | Output (OUT) | Class-AB output stage capable of ±30mA sink/source into 2kΩ load |
| 7 | Positive Supply (V+) | High-side power rail connection; decoupling capacitor required |
| 8 | No Connect | Internally unconnected; must be left floating per TI specification |
Key Features
| Feature | Design Value |
|---|---|
| True FET input stage | 5pA input bias current enables high-Z source interfacing without DC error accumulation |
| No phase reversal | Operates safely beyond common-mode range (±13.5V) without output polarity inversion |
| Unity-gain stable | Guaranteed stable in G = +1 configuration with ≥100pF capacitive load and no external compensation |
| Low interchannel crosstalk | 128dB channel separation at DC ensures isolation in multi-amplifier audio systems |
| Wide output voltage swing | Delivers 21.3dBu headroom at 0.01% THD+N - exceeds OP176 by 0.6dBu under identical conditions |
Applications
| Professional Audio Line Driver | Studio-Grade Preamplifier |
|---|---|
|
Use Scenario: Driving balanced XLR outputs from analog mixing consoles or digital audio workstations over 10m cable runs. IC Role / Device Role / Timing Role: Single-ended to differential conversion and current-boosted line driving with minimal harmonic corruption. Use Value: 0.00008% THD+N and 20V/µs slew rate preserve transient fidelity and prevent intermodulation distortion on complex program material. |
Use Scenario: Low-noise gain staging for condenser microphone signals prior to ADC sampling in recording interfaces. IC Role / Device Role / Timing Role: First-stage voltage amplification with ultra-low input-referred noise and negligible DC offset drift. Use Value: 8nV/√Hz input voltage noise and 5pA bias current minimize hiss and DC wander in 100kΩ+ microphone transformer secondary networks. |
| Active Crossover Network | High-Fidelity Active Filter |
|
Use Scenario: Splitting full-range audio into band-limited signals for multi-driver loudspeaker systems using 24dB/octave Linkwitz-Riley topology. IC Role / Device Role / Timing Role: Precision op-amp core in 4th-order Sallen-Key and MFB filter sections requiring low phase shift and high stopband rejection. Use Value: 120dB open-loop gain and 8MHz GBW ensure accurate pole placement and <0.1° phase error at 20kHz crossover points. |
Use Scenario: Implementing notch, bandpass, or parametric EQ sections in mastering-grade equalizers with Q > 10. IC Role / Device Role / Timing Role: High-Q resonant stage where gain accuracy, noise floor, and distortion flatness directly define tonal character. Use Value: Flat THD+N vs frequency curve (0.00008%–0.00015%) across 20Hz–20kHz ensures neutral frequency response without coloration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2134UA/2K5 | Dual-channel version in same SOIC-8 package; identical electrical specs per channel but shares thermal mass | Preferred for stereo line receivers or dual-path active filters where channel matching and layout symmetry matter | Select OPA2134UA/2K5 only when dual-channel integration reduces board area or improves channel tracking - not as drop-in replacement |
| OPA1611AIDR | Lower 1.1nV/√Hz noise, higher 50mA output drive, but 10x higher 50pA input bias current and different SOIC-8 pinout | Better suited for ultra-low-noise mic preamps with low-Z sources; incompatible pinout requires PCB redesign | Choose OPA1611AIDR only when sub-2nV/√Hz noise is mandatory and input impedance ≤1kΩ - not for FET-input legacy designs |
Compared with OPA134UA/2K5G4, the OPA2134UA/2K5 offers channel pairing at identical performance but no pin compatibility, while OPA1611AIDR trades ultra-low bias current for lower voltage noise and higher drive - making each suitable only for distinct design constraints, not direct substitution.
Availability
OPA134UA/2K5G4 is available at Aetrix Electronics and suitable for professional audio equipment, studio monitor controllers, and high-end consumer DAC/headphone amplifier designs requiring stable component supply and long-term production continuity.
Supply support for OPA134UA/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 precision op-amp design and audio signal-chain innovation.
The OPAx134 series was engineered specifically for high-fidelity audio applications demanding ultra-low distortion, wide bandwidth, and robust DC precision - targeting professional recording gear, broadcast infrastructure, and audiophile playback systems.
FAQ
What is the maximum supply voltage for OPA134UA/2K5G4?
The OPA134UA/2K5G4 supports dual-supply operation from ±2.5V to ±18V, with absolute maximum ratings specifying 36V total supply voltage (V+ to V–). Operation at ±18V is fully characterized and validated per TI's SBOS058B datasheet, delivering specified THD+N, slew rate, and output swing performance without derating.
Does OPA134UA/2K5G4 require external compensation for unity-gain stability?
No, the OPA134UA/2K5G4 is internally compensated and unity-gain stable. It maintains stability with capacitive loads up to 100pF and exhibits clean step response in G = +1 configurations without added feedback capacitance or series resistance - confirmed by TI's Figure 5-20 and 5-21 small/large-signal transient data.
Can OPA134UA/2K5G4 be used in single-supply audio applications?
Yes, the OPA134UA/2K5G4 operates from 5V to 36V single supply, with recommended conditions specifying 5V minimum. For single-supply use, the input common-mode range extends to (V–)+2.5V and output swings to within 1.2V of V–, requiring proper DC biasing of inputs and AC-coupled outputs - detailed in Section 7.1.1 of the datasheet.
What is the thermal resistance (RθJA) of OPA134UA/2K5G4 in SOIC-8 package?
The OPA134UA/2K5G4 in SOIC-8 (D package) has a junction-to-ambient thermal resistance (RθJA) of 160°C/W, as specified in Section 5.4 of the SBOS058B datasheet. This value assumes standard JEDEC 2S2P test board conditions and informs heatsinking requirements for continuous 5mA quiescent current operation at elevated ambient temperatures.
Is OPA134UA/2K5G4 pin-compatible with other OPAx134 variants like OPA2134 or OPA4134?
No, OPA134UA/2K5G4 is not pin-compatible with OPA2134 or OPA4134. While all share the same SOIC footprint family, OPA134 uses an 8-pin SOIC with NC pins at 1, 5, and 8; OPA2134 uses the same 8-pin SOIC but with functional pins at all positions; OPA4134 uses a 14-pin SOIC. PCB layout must match the exact variant.
OPA134UA/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:
- 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/2K5G4 FAQ
1.How can I place an order for OPA134UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA134UA/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 OPA134UA/2K5G4 reliable?
The price and inventory of OPA134UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA134UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA134UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA134UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA134UA/2K5G4?
OPA134UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA134UA/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 OPA134UA/2K5G4?
For technical support, including OPA134UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA134UA/2K5G4 requirements.
6.How does Aetrix verify that OPA134UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA134UA/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 OPA134UA/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA134UA/2K5G4?
All OPA134UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA134UA/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 OPA134UA/2K5G4 part is unused and in its original packaging.
Return procedure for OPA134UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA134UA/2K5G4 Tags
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