Texas Instruments OPA4134UA

Overview

OPA4134UA from Texas Instruments is a quad-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), high slew rate (20V/µs), and rail-to-rail output swing within 1V of supply rails - enabling clean, high-headroom amplification in line drivers, preamplifiers, and active filters.

For engineers reviewing the OPA4134UA datasheet, OPA4134UA pinout, OPA4134UA application, or OPA4134UA equivalent, this page provides verified specifications, SOIC-14 package details, channel-isolated architecture insights, and real-world audio design context - all grounded in TI's SBOS058B production data sheet.

Technical Context

The OPA4134UA integrates four fully independent, unity-gain-stable op-amp channels in a single SOIC-14 package, with no crosstalk coupling even under overload or overdrive conditions. Its true JFET input stage ensures ultra-low input bias current (5pA typ) and exceptional common-mode rejection (>128dB DC), while cascode input circuitry maintains stable bias across ±13.5V input common-mode range.

It operates from dual supplies of ±2.5V to ±18V (or single 5V–36V), supports capacitive loads up to 100pF without instability, and achieves full-power bandwidth of 1.3MHz at 3Vpp into 2kΩ - making it suitable for wide-dynamic-range analog signal paths where phase inversion, distortion, and thermal drift must be minimized.

Key Specifications

Pinout & Package

OPA4134UA is housed in a 14-pin SOIC (SO-14) surface-mount package with exposed pad not connected internally. The device features four independent op-amp channels, each with dedicated noninverting (+IN), inverting (–IN), and output (OUT) terminals, plus shared V+ and V– power pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4134UA, OPA4132UA offers marginal THD+N improvement at the cost of reduced supply voltage range, while LM4562MA trades lower noise floor for higher power consumption and better immunity to supply ripple - making OPA4134UA the balanced choice for general-purpose, wide-supply, low-distortion audio signal chains.

Availability

OPA4134UA is available at Aetrix Electronics and suitable for professional audio mixing consoles, high-resolution DAC output stages, active speaker crossover networks, and studio microphone preamplifiers requiring stable component supply across extended temperature and voltage ranges.

Supply support for OPA4134UA 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-amps and audio signal chain solutions.

The OPAx134 family was engineered specifically for high-end audio applications demanding ultra-low distortion, low noise, and robust DC performance - targeting professional recording, broadcast, and premium consumer audio equipment.

FAQ

What is the maximum supply voltage for OPA4134UA?

The OPA4134UA supports dual supplies from ±2.5V to ±18V, with absolute maximum rating of ±18V. Operation beyond ±18V risks permanent damage per TI's SBOS058B datasheet Section 5.1. At ±18V, the device delivers 21.3dBu headroom (THD+N < 0.01%) into 2kΩ, making it suitable for legacy pro-audio gear requiring full rail utilization. Always use ≥10nF ceramic bypass capacitors on V+ and V– pins.

Does OPA4134UA require external compensation for unity-gain stability?

No, OPA4134UA is internally compensated for unity-gain stability and remains stable with closed-loop gains ≥1, including voltage-follower configurations. It also tolerates ≥100pF capacitive loads without oscillation, as confirmed in TI's SBOS058B Figure 5-23 and Section 7.1. This eliminates need for external compensation networks in line driver or buffer applications.

How does OPA4134UA handle input common-mode voltage violations?

OPA4134UA is explicitly designed to avoid phase reversal - a failure mode seen in many FET-input op-amps. Even when input voltages exceed the specified common-mode range (e.g., ±13.5V on ±15V supplies), the output remains well-behaved without polarity inversion. This makes it safe for use in voltage-follower line receivers where input transients may breach rails.

What is the channel-to-channel crosstalk specification for OPA4134UA?

OPA4134UA provides 128dB channel separation at DC and 126dB at 20kHz (RL = 2kΩ), per SBOS058B Section 5.7. This is achieved through completely independent internal circuitry - no shared bias or gain stages - ensuring zero interaction between channels even during overload or short-circuit events on adjacent amplifiers.

Can OPA4134UA drive 600Ω professional audio loads?

Yes, OPA4134UA delivers 0.00015% THD+N into 600Ω at 1kHz (SBOS058B Table 5.7), with output swing limited to (V+) – 1.5V / (V–) + 1.2V. At ±15V supplies, this yields ±13.5V swing - sufficient for +24dBu professional line levels (12.3Vrms). For sustained 600Ω driving, ensure adequate PCB copper area and thermal relief, as RθJA = 97°C/W in SOIC-14.