Texas Instruments OPA2134PAG4

Overview

OPA2134PAG4 from Texas Instruments is a dual-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), 8nV/√Hz input voltage noise, 20V/µs slew rate, and operates from ±2.5V to ±18V supplies - enabling clean line-level amplification, active filtering, and preamplifier stages in studio mixers and DAC output buffers.

For engineers reviewing the OPA2134PAG4 datasheet, OPA2134PAG4 pinout, OPA2134PAG4 application, or OPA2134PAG4 equivalent, this page provides verified specifications, dual-channel pin mapping for SOIC-8, real-world audio use cases, and two validated alternative op-amps with documented performance trade-offs.

Technical Context

The OPA2134PAG4 employs a true JFET input stage with 5pA input bias current and rail-to-rail output swing within 1.2V of each supply rail, ensuring low distortion across wide common-mode ranges. Its unity-gain stability, 8MHz gain-bandwidth product, and 120dB open-loop gain support precision DC-coupled and AC-coupled audio paths without phase reversal or overload recovery issues.

Channel independence is fully implemented: each amplifier operates with isolated biasing and output stages, delivering >126dB channel separation at 20kHz and no crosstalk-induced intermodulation - critical for stereo line drivers and balanced receiver circuits where signal integrity between channels must be preserved under dynamic load conditions.

Key Specifications

Pinout & Package

OPA2134PAG4 is housed in an 8-pin PDIP (Plastic Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin 1 is top-left corner when notch is oriented up; pin numbering proceeds counterclockwise.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar audio operational amplifier applications.

Compared with OPA2134PAG4, the OPA2134UA offers identical electrical performance in a surface-mount package ideal for modern production, while the NE5532AP trades distortion and input impedance for higher output current and lower unit cost - making it suitable only for less demanding audio paths where JFET input advantages are unnecessary.

Availability

OPA2134PAG4 is available at Aetrix Electronics and suitable for professional audio equipment, high-end consumer DACs, and studio monitoring systems requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for OPA2134PAG4 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 expertise in precision amplifiers and audio signal chain solutions.

The OPAx134 series was designed specifically for high-fidelity audio applications - emphasizing ultra-low distortion, low noise, and robust DC performance to replace legacy op-amps in recording, mastering, and playback systems.

FAQ

What is the maximum supply voltage for OPA2134PAG4?

The OPA2134PAG4 supports dual-supply operation from ±2.5V to ±18V, with absolute maximum ratings specifying 36V total supply voltage (V+ to V–). Operation beyond ±18V risks exceeding recommended conditions and may degrade long-term reliability or increase distortion; TI specifies all key parameters at ±15V, and performance remains stable across the full ±2.5V to ±18V range.

Does OPA2134PAG4 require external compensation?

No, the OPA2134PAG4 is unity-gain stable and does not require external compensation components. It maintains stability with capacitive loads up to 100pF and any resistive feedback configuration. The internal compensation network ensures phase margin >60° across temperature and supply variations, eliminating need for external capacitors or resistor networks in standard gain-of-1, inverting, or noninverting topologies.

Can OPA2134PAG4 drive 600Ω loads?

Yes, the OPA2134PAG4 delivers 0.00015% THD+N into 600Ω at 1kHz and 1Vpp, with output swing limited to (V+) – 1.5V / (V–) + 1.2V. At ±15V supplies, it sustains ±13.5V output into 600Ω, supporting professional line-level standards. For sustained high-power operation, ensure adequate PCB copper area and ambient temperature control due to higher quiescent current (5mA per channel) and thermal resistance (71°C/W) of the PDIP package.

Is OPA2134PAG4 pin-compatible with other dual op-amps in PDIP-8?

No, OPA2134PAG4 uses a non-standard pinout: OUT A (pin 1), –IN A (pin 2), +IN A (pin 3), V– (pin 4), +IN B (pin 5), –IN B (pin 6), OUT B (pin 7), V+ (pin 8). This differs from industry-standard dual op-amps like LM358 or NE5532, which place V+ at pin 8 and V– at pin 4. Direct replacement requires PCB redesign; verify pin mapping before substitution.

What is the input bias current specification for OPA2134PAG4?

The OPA2134PAG4 features a true FET input stage with typical input bias current of 5pA at 25°C, and maximum of ±100pA over the full –40°C to +85°C operating range. This ultra-low IB enables high-impedance sensor interfaces and passive source coupling (e.g., guitar pickups, piezoelectric transducers) without significant DC offset or loading errors - a key differentiator from bipolar-input op-amps like NE5532 (800nA typical).