Texas Instruments TL4581P

Overview

TL4581P 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, and ±18 V supply operation with 32 V_PP output swing into 600 Ω - enabling high-fidelity preamplification in CD/DVD players and set-top boxes.

For engineers reviewing the TL4581P datasheet, TL4581P pinout, TL4581P application, or TL4581P equivalent, key selection criteria include input noise performance under 1 kHz, capacitive-load drive capability, common-mode rejection above 100 dB, and thermal design margin given its 85°C/W θ_JA in PDIP packaging.

Technical Context

The TL4581P integrates two independent high-slew-rate op-amps on a single silicon die with matched internal biasing to minimize crosstalk (110 dB). Its architecture supports rail-to-rail input common-mode range (±13 V) and maintains stable gain-phase response driving 100 pF loads - critical for active filter stages without external compensation.

Designed for ±3 V to ±20 V dual-supply operation, it achieves 100 V/mV large-signal voltage gain and 100 dB CMRR while sustaining 38 mA short-circuit output current per channel - enabling direct headphone driver functionality without external buffers.

Key Specifications

Pinout & Package

TL4581P is supplied in an 8-pin plastic dual in-line package (PDIP-P), with 85°C/W junction-to-ambient thermal resistance and through-hole mounting compatibility. Pin 1 is located at the left end of the top row when viewed from the top with the notch or dot oriented upward.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4581P, NE5532P offers identical noise and pin compatibility but higher bias current, while OPA2134PA provides superior input impedance at the cost of PDIP availability and higher unit price - making TL4581P optimal for through-hole audio systems needing balanced noise, drive, and cost.

Availability

TL4581P is available at Aetrix Electronics and suitable for CD/DVD player audio preamplifiers, set-top box tone control circuits, and headphone amplifier stages requiring stable component supply across industrial temperature ranges and long-lifecycle production programs.

Supply support for TL4581P 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 over 90 years of innovation in precision amplifiers and signal chain solutions.

The TL4581P belongs to TI's legacy audio op-amp product line, engineered specifically for high-fidelity consumer audio equipment requiring low noise, high output drive, and robust dual-supply operation.

FAQ

What is the maximum supply voltage rating for TL4581P?

The TL4581P has absolute maximum supply ratings of +22 V on VCC+ and –22 V on VCC–, but its recommended operating range is ±5 V to ±15 V. Operating at ±18 V is permissible per datasheet test conditions and yields 32 V_PP output swing into 600 Ω, though thermal dissipation must be managed using its 85°C/W θ_JA rating in PDIP packaging. Exceeding ±20 V risks permanent damage.

Does TL4581P support single-supply operation?

The TL4581P is specified for dual-supply operation only, with input common-mode range extending to ±13 V and output swing centered around midsupply. It lacks rail-to-rail input or output architecture and does not meet functional specifications under single-supply biasing. For single-supply audio applications, TI recommends alternatives such as the TLE2062 or OPA1678, not the TL4581P.

What is the thermal resistance (θJA) of TL4581P in its PDIP package?

The TL4581P in PDIP-P package has a junction-to-ambient thermal resistance (θ_JA) of 85°C/W, measured under standard JEDEC test conditions (single-layer board, 1 in² copper pad). This value assumes proper PCB copper pour and decoupling; actual thermal performance may degrade by 15–25% in compact layouts without thermal vias or extended copper areas. Derating is required above 70°C ambient.

Can TL4581P drive 100 pF capacitive loads stably?

Yes, the TL4581P maintains stability driving 100 pF capacitive loads at unity gain, as confirmed by its 10 MHz unity-gain bandwidth test condition (CL = 100 pF). The datasheet specifies no external compensation is needed for this load, unlike many general-purpose op-amps. However, for loads exceeding 100 pF, a small series resistor (10–47 Ω) at the output is recommended to preserve phase margin.

Is TL4581P RoHS compliant?

Yes, TL4581P is RoHS compliant, with lead finish specified as NIPDAU (nickel-palladium-gold) and full compliance documented in TI's Packaging Information Addendum. It meets EU Directive 2011/65/EU requirements and carries no exemptions. The PDIP-P package contains no lead-based solder or hazardous substances above threshold limits.