Texas Instruments TL4581PSR

Overview

TL4581PSR from Texas Instruments is a dual low-noise, high-drive operational amplifier optimized for audio signal conditioning. It delivers 5 nV/√Hz input noise at 1 kHz, 10 MHz unity-gain bandwidth, 9 V/µs slew rate, ±3 V to ±20 V supply range, and 32 V_PP output swing into 600 Ω with ±18 V supplies - enabling high-fidelity preamplification in compact consumer audio systems.

For engineers reviewing the TL4581PSR datasheet, TL4581PSR pinout, TL4581PSR application, or TL4581PSR equivalent, key selection criteria include its low-noise performance in 1 kHz–20 kHz audio band, capacitive-load drive capability up to 100 pF, dual-channel layout for stereo signal paths, and SOIC-8 packaging compatible with standard surface-mount audio PCB layouts.

Technical Context

The TL4581PSR integrates two independent op-amp channels sharing a common ±15 V (max ±20 V) dual supply, each featuring internally compensated high-gain-bandwidth architecture. Its input stage uses bipolar junction transistors to achieve low input bias current (200–800 nA typ) and low input offset voltage (0.5–4 mV typ), while the output stage supports ±38 mA short-circuit current and drives 600 Ω loads with <10% overshoot at unity gain.

Designed for open-loop or closed-loop audio gain stages, it maintains 100 dB CMRR and 100 dB PSRR across 0°C to 70°C, with 110 dB crosstalk attenuation between channels - ensuring minimal inter-channel interference in stereo headphone amplifiers and active filter topologies.

Key Specifications

Pinout & Package

TL4581PSR is housed in an 8-pin SOP (PS) package - a surface-mount variant of SOIC with 1.27 mm lead pitch, 5.3 mm body width, and 1.75 mm max height - optimized for automated placement and reflow in consumer audio assembly lines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-noise op-amp applications.

Compared with TL4581PSR, NE5532DR offers lower noise but higher bias current, making it preferable in low-Z audio paths; OPA2134PA provides FET-input advantages for high-Z sources but sacrifices output drive - TL4581PSR uniquely balances noise, drive, and supply flexibility for integrated consumer audio ICs.

Availability

TL4581PSR is available at Aetrix Electronics and suitable for DVD/CD player audio subsystems, set-top box tone control modules, and portable headphone amplifier designs requiring stable component supply and long-lifecycle support.

Supply support for TL4581PSR 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal solutions for industrial, automotive, and consumer markets.

The TL4581PSR belongs to TI's legacy audio op-amp product line, engineered specifically for cost-sensitive, high-volume consumer audio equipment where low noise, robust output drive, and SOIC-8 manufacturability are critical design requirements.

FAQ

What is the maximum supply voltage rating for TL4581PSR?

The TL4581PSR has an absolute maximum supply voltage rating of ±22 V across VCC+ and VCC– terminals. However, the recommended operating range is ±5 V to ±15 V per the datasheet. Operating at ±18 V is permissible for peak output swing testing but requires thermal derating due to its 95°C/W θ_JA; sustained operation above ±15 V should verify junction temperature stays below 150°C. The TL4581PSR must never see differential supply exceeding 44 V.

Does TL4581PSR support single-supply operation?

The TL4581PSR is specified for dual-supply operation (±3 V to ±20 V) and does not feature rail-to-rail input or output. Its common-mode input range is ±12 V to ±13 V with ±15 V supplies, and output swing is centered around midsupply. While it can be biased for pseudo-single-supply use with a V_REF divider, TI does not characterize or guarantee performance in true single-supply configurations. For such applications, dedicated single-supply op-amps like TLV2462 are recommended over TL4581PSR.

What is the thermal resistance (θ_JA) of TL4581PSR in its SOP-8 package?

The TL4581PSR in the SOP (PS) package has a published junction-to-ambient thermal resistance (θ_JA) of 95°C/W under standard JEDEC test conditions (1-layer 1-oz copper board). This value assumes no additional copper pour or thermal vias. In production PCBs with 2+ oz copper and thermal relief, actual θ_JA may improve by 15–25%. The TL4581PSR's 150°C maximum junction temperature allows ~75°C ambient rise at 800 mW dissipation - sufficient for typical audio gain stages drawing ≤16 mA total supply current.

Can TL4581PSR drive 32 Ω headphones directly?

Yes, TL4581PSR can drive 32 Ω headphones directly: its ±38 mA short-circuit output current and 32 V_PP swing into 600 Ω scale to ~±14 V into 32 Ω, delivering >100 mW per channel with <0.1% THD+N at 1 kHz. However, optimal performance requires AC-coupling (to block DC offset), proper decoupling (100 nF ceramic + 10 µF tantalum per supply rail), and layout minimizing ground loops. The TL4581PSR's 110 dB crosstalk ensures clean stereo separation in this configuration.

Is TL4581PSR RoHS compliant and lead-free?

Yes, TL4581PSR is RoHS compliant and features lead-free (NIPDAU) termination per TI's packaging documentation. Its MSL rating is Level-1 (unlimited floor life at ≤30°C/60% RH), and peak reflow temperature is rated at 260°C. The part marking "T4581" appears on the top surface, and the device meets TI's standard warranty and reliability specifications for commercial temperature range (0°C to 70°C). All TL4581PSR units supplied by Aetrix Electronics carry full traceability and compliance documentation.