Texas Instruments TL081CPSR

Overview

TL081CPSR from Texas Instruments is a single-channel JFET-input operational amplifier in SO-8 package, delivering 5.25 MHz gain-bandwidth, 20 V/μs slew rate, ±13.5 V output swing (RL ≥ 10 kΩ), 100 dB CMRR, and 70 dB PSRR at ±15 V supply. It serves precision DC-coupled amplification and active filtering in industrial analog signal chains.

For engineers reviewing the TL081CPSR datasheet, TL081CPSR pinout, TL081CPSR application, or TL081CPSR equivalent, key selection criteria include input offset voltage (3–10 mV), common-mode input range (±11 V), quiescent current (1.4–2.5 mA), and SO-8 thermal performance (R_θJA = 95 °C/W) for stable operation in 0°C to 70°C ambient environments.

Technical Context

The TL081CPSR uses a high-impedance JFET differential pair input stage enabling ultra-low input bias current (65–200 pA) and low input capacitance (100 MΩ || 2 pF differential). Its internal compensation ensures unity-gain stability with capacitive loads up to 300 pF.

It operates from split supplies (±2.25 V to ±20 V) or single supply (4.5 V to 40 V), supports rail-to-rail common-mode input (including V_CC+), and features output short-circuit protection with ±26 mA drive capability and 125 Ω open-loop output impedance at 1 MHz.

Key Specifications

Pinout & Package

TL081CPSR is housed in an 8-pin SOIC (PS) package with exposed pad not present; thermal resistance R_θJA = 95 °C/W enables operation at 70°C ambient with ≤300 mW dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL081IP and OPA2134PA, TL081CPSR uniquely combines SO-8 surface-mount compatibility, factory-trimmable offset via dedicated pins, and proven 0.003% THD+N - making it optimal for production-grade industrial signal conditioning where manual calibration and thermal reliability are prioritized over ultra-low noise.

Availability

TL081CPSR is available at Aetrix Electronics and suitable for solar inverter monitoring, pro audio mixer preamps, battery test equipment, and AC motor drive current sensing requiring stable component supply across extended production lifecycles.

Supply support for TL081CPSR 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 heritage in precision op-amps and industrial-grade signal chain solutions.

TL081CPSR belongs to TI's TL08x series of JFET-input op-amps, engineered for cost-sensitive yet performance-demanding industrial applications requiring wide supply range, high input impedance, and robust ESD tolerance (±1.5 kV HBM).

FAQ

What is the maximum operating temperature range for TL081CPSR?

The TL081CPSR is rated for operation from 0°C to 70°C ambient temperature, as defined by its 'C' grade designation. This makes it suitable for commercial and industrial indoor environments but not extended-temperature applications such as automotive under-hood or military systems. The device maintains specified DC parameters-including input offset voltage (3–10 mV) and open-loop gain (25–200 V/mV)-within this range. Always verify thermal margin using R_θJA = 95 °C/W and actual power dissipation in your layout.

Does TL081CPSR support single-supply operation?

Yes, TL081CPSR supports single-supply operation from 4.5 V to 40 V. Its common-mode input voltage range extends to V_CC+, allowing the inverting and non-inverting inputs to operate near the positive rail-critical for single-supply sensor interfaces. However, output swing remains limited to approximately 1.2 V from each rail (e.g., 0.5–3.5 V on a 4.5-V supply), so level-shifting or rail-splitting may be needed for true rail-to-rail output. Input bias current stays below 200 pA across the full supply range.

How do the OFFSET N1 and OFFSET N2 pins function on TL081CPSR?

The OFFSET N1 (Pin 1) and OFFSET N2 (Pin 5) pins on TL081CPSR provide external access to the internal input stage nulling network. Connecting a 10-kΩ potentiometer between these pins-with its wiper grounded-allows manual adjustment of input offset voltage to ≤1 mV in final calibration. This feature is absent in standard TL081 variants (e.g., TL081CP) and is essential for DC-critical applications like precision weigh scales or calibrated data acquisition front-ends where software offset correction is impractical.

What is the capacitive load drive capability of TL081CPSR?

TL081CPSR is characterized to drive capacitive loads up to 300 pF while maintaining stability and specified settling time (0.56 μs to 0.1%). This capability supports direct connection to ADC input capacitors, long PCB traces, or anti-aliasing filters without external isolation resistors. For loads >300 pF, a series resistor (≥100 Ω) between TL081CPSR output and the capacitor restores phase margin. The device's internal compensation and 5.25-MHz GBW ensure predictable step response even with moderate capacitive loading-verified in Figure 5-23 and 5-24 of the official datasheet.

Is TL081CPSR pin-compatible with other TL081 variants in SO-8 packages?

TL081CPSR shares the same SO-8 (PS) footprint and pinout as TL081IP (PDIP), TL081CDR (SOIC), and TL081CP (SOIC), but differs electrically in offset null provision: only TL081CPSR and TL081ACPSR expose OFFSET N1/N2 on Pins 1 and 5. Other SO-8 variants use Pin 1 and Pin 5 as NC. Thus, while PCB layout is interchangeable, functional replacement requires verifying whether offset trimming is required in the target design. No changes to solder paste stencil or reflow profile are needed for migration to TL081CPSR.