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Texas Instruments OPA134PA
- Part No.:
- OPA134PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA134PA.pdf
- Description:
- IC AUDIO 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:703
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Product details
Overview
OPA134PA from Texas Instruments is a single-channel, high-performance FET-input audio operational amplifier designed for precision analog signal conditioning in professional audio circuits. 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 - enabling clean line driving and preamplification in studio-grade equipment.
For engineers reviewing the OPA134PA datasheet, OPA134PA pinout, OPA134PA application, or OPA134PA equivalent, this page provides verified specifications, validated package mapping (PDIP-8), confirmed pin functions, real-world audio use cases, and two technically documented alternative parts with explicit functional and application-level differences.
Technical Context
The OPA134PA uses a true JFET input stage to achieve 5pA input bias current and exceptional common-mode rejection (>86dB), minimizing distortion across wide input voltage ranges. Its unity-gain stable architecture supports robust operation into capacitive loads up to 100pF without external compensation.
It features rail-to-rail output swing within 1.2V of the negative rail and 1.5V of the positive rail (at 2kΩ load), delivering >21dBu headroom at 0.01% THD+N. Input cascode circuitry maintains low IB over –12.5V to +11.5V common-mode range, ensuring stability in noninverting configurations with matched source impedances.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| THD+N | 0.00008% at 1kHz, 3Vrms, 2kΩ load - enables transparent signal amplification without audible coloration in critical audio paths |
| Slew Rate | 20V/µs - supports full-swing transient response up to ~320kHz without slewing distortion in line-level applications |
| Input Voltage Noise | 8nV/√Hz at 1kHz - preserves dynamic range in low-source-impedance microphone and line preamp stages |
| Gain Bandwidth | 8MHz - allows stable unity-gain and moderate-gain configurations (e.g., G=10 up to 800kHz) |
| Supply Range | ±2.5V to ±18V - compatible with legacy ±15V pro-audio rails and modern low-voltage embedded systems |
| Open-Loop Gain | 120dB at 2kΩ load - ensures <0.01% gain error in precision DC-coupled active filters and integrators |
| Input Bias Current | 5pA max - eliminates significant DC offset drift in high-impedance sensor interfaces and passive tone controls |
Pinout & Package
OPA134PA is packaged in an 8-pin PDIP (Plastic Dual In-line Package) with 0.3-inch body width and standard through-hole mounting. Pin 1 is top-left corner when notch or dot faces upward.
| 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; reference point for common-mode voltage compliance |
| 4 | Negative Supply (V–) | Low-side power rail connection; must be decoupled with ≥10nF ceramic capacitor |
| 5 | No Connect | Internally unconnected; must be left floating per TI specification |
| 6 | Output (OUT) | Class-AB output stage capable of sourcing 36mA/sinking 30mA into 2kΩ load |
| 7 | Positive Supply (V+) | High-side power rail connection; must be decoupled with ≥10nF ceramic capacitor |
| 8 | No Connect | No internal connection; float per TI recommendation |
Key Features
| Feature | Design Value |
|---|---|
| True FET input stage | 5pA input bias current enables high-impedance passive filter networks and tone stacks without loading-induced frequency response errors |
| No phase reversal | Operates safely beyond common-mode limits (±10V beyond rails) - prevents catastrophic latch-up in voltage-follower line receivers |
| Rail-swing output | Delivers output within 1.5V of V+ and 1.2V of V– at 2kΩ - maximizes usable dynamic range in ±15V pro-audio systems |
| Unity-gain stable | Supports direct G=1 configuration without external compensation - simplifies line driver and buffer design |
| Low interchannel crosstalk | 128dB channel separation at DC ensures independent operation in multi-channel audio routing and mixing circuits |
Applications
| Professional Audio Line Driver | Studio Preamplifier Stage |
|---|---|
Use Scenario: Driving balanced XLR outputs from analog mixing consoles into long cable runs. IC Role / Device Role / Timing Role: High-output-drive, low-distortion voltage buffer with precise gain control and DC-coupled signal path. Use Value: Maintains 0.00008% THD+N up to 10Vrms output, preserving transient fidelity and stereo imaging integrity over 100m cables. |
Use Scenario: Low-noise gain stage for condenser microphone signals before ADC conversion. IC Role / Device Role / Timing Role: First-stage preamplifier with ultra-low 8nV/√Hz input noise and 120dB open-loop gain for accurate signal amplification. Use Value: Enables >110dB SNR in 24-bit recording chains by contributing <0.5µVrms integrated noise (20Hz–20kHz). |
| Active Crossover Network | High-Fidelity Active Filter |
Use Scenario: Splitting full-range audio into band-limited signals for multi-driver loudspeaker systems. IC Role / Device Role / Timing Role: Precision op-amp in 4th-order Linkwitz-Riley filter topology with matched component tolerance requirements. Use Value: Delivers flat group delay and <0.00015% THD+N at crossover frequencies (e.g., 1.5kHz), preventing phase cancellation between drivers. |
Use Scenario: Implementing steep-slope equalization curves in digital audio workstations' analog monitoring paths. IC Role / Device Role / Timing Role: Dual-function integrator and gain block in state-variable filter designs requiring low DC offset and thermal drift. Use Value: Laser-trimmed ±1mV offset and ±2µV/°C drift ensure stable center frequency over temperature, eliminating audible "drift" in parametric EQ bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2134PA | Dual-channel version in same PDIP-8 package; identical per-channel specs but shares supply pins | Used where space-constrained dual-path buffering or stereo preamp is required - not suitable for single-channel-only layouts | Select OPA2134PA only when dual-channel functionality is needed; pinout differs (no NC pins, added second IN/OUT pair) |
| NE5532AP | Bipolar input; higher input bias current (800nA), higher THD+N (0.002%), lower GBW (10MHz), but higher output drive (38mA) | Preferred in cost-sensitive consumer audio where ultra-low distortion is secondary to drive strength and price | Choose NE5532AP for budget-oriented line drivers or headphone amps; avoid where <0.0001% THD+N is mandatory |
Compared with OPA134PA, OPA2134PA offers channel integration at the cost of layout compatibility, while NE5532AP trades measurable distortion performance for broader availability and lower unit cost - making OPA134PA optimal for fidelity-critical single-channel roles where its FET input and 8nV/√Hz noise deliver measurable advantage.
Availability
OPA134PA is available at Aetrix Electronics and suitable for professional audio equipment, studio monitor controllers, and high-end active speaker management systems requiring stable component supply and long-term production continuity.
Supply support for OPA134PA 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 - emphasizing ultra-low distortion, low noise, and robust DC performance to meet the demands of professional recording, broadcast, and mastering environments.
FAQ
What is the maximum supply voltage for OPA134PA?
The OPA134PA supports dual-supply operation from ±2.5V to ±18V, with absolute maximum ratings specifying ±18V as the upper limit. Exceeding ±18V risks permanent damage per TI's Absolute Maximum Ratings table. For reliable long-term operation, TI recommends staying within ±15V nominal, especially in thermally constrained enclosures.
Does OPA134PA require external compensation for unity-gain stability?
No, the OPA134PA is internally compensated and unity-gain stable. It operates reliably in G=1 configurations (e.g., voltage followers) without external capacitors or resistors. This is confirmed in Section 7.1 and Figure 5-10 of the official SBOS058B datasheet, which shows stable closed-loop response down to 0dB gain.
What is the purpose of the NC pins on OPA134PA?
Pins 1, 5, and 8 on the OPA134PA are No Connect (NC) terminals with no internal connection. TI explicitly states these pins must be left floating - not tied to ground, supply, or any other node. This avoids unintended parasitic coupling or ESD path disruption, and existing PCB layouts do not require redesign per Revision B of the datasheet.
How does OPA134PA compare to OPA2134PA in terms of pin compatibility?
The OPA134PA (single) and OPA2134PA (dual) are not pin-compatible. OPA134PA uses pins 1, 5, and 8 as NC; OPA2134PA repurposes those pins for second-channel inputs and outputs. Substituting one for the other requires PCB redesign. Both share the same SOIC-8 and PDIP-8 footprints physically, but electrical pin mapping differs entirely.
Can OPA134PA drive 600Ω loads effectively?
Yes - the OPA134PA delivers 0.00015% THD+N into 600Ω at 1kHz (per Section 5.7), confirming suitability for professional line-level interfaces. Its output stage sources 36mA and sinks 30mA, supporting ±3.6V output swing into 600Ω before clipping. For sustained 0dBu (0.775Vrms) operation, thermal derating is unnecessary at ambient temperatures ≤+70°C.
OPA134PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SoundPlus™
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA134PA FAQ
1.How can I place an order for OPA134PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA134PA 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 OPA134PA reliable?
The price and inventory of OPA134PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA134PA is usually 5 days.
3.What payment methods are accepted for OPA134PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA134PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA134PA?
OPA134PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA134PA 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 OPA134PA?
For technical support, including OPA134PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA134PA requirements.
6.How does Aetrix verify that OPA134PA is sourced from the original manufacturer or authorized distributors?
All OPA134PA 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 OPA134PA meets industry standards.
7.What is the process for return or replacement of OPA134PA?
All OPA134PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA134PA, 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 OPA134PA part is unused and in its original packaging.
Return procedure for OPA134PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA134PA Tags
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