Texas Instruments TL081CPG4

Overview

TL081CPG4 from Texas Instruments is a single-channel JFET-input operational amplifier optimized for precision analog signal conditioning in industrial and audio applications. It delivers 5.25 MHz gain-bandwidth, 20 V/μs slew rate, ±13.5 V output swing (RL ≥ 10 kΩ), low 37 nV/√Hz input voltage noise at 1 kHz, and operates from ±2.25 V to ±20 V supplies. It is widely used in pro audio mixers and battery test equipment where high CMRR and rail-to-rail common-mode input range are critical.

For engineers reviewing the TL081CPG4 datasheet, TL081CPG4 pinout, TL081CPG4 application, or TL081CPG4 equivalent, this page provides verified electrical specifications, SOIC-8 package terminal mapping, real-world use cases in audio and power test systems, and two validated alternative op-amps with documented functional and performance differences.

Technical Context

The TL081CPG4 employs a JFET-input differential pair enabling ultra-low input bias current (≤200 pA typical) and high input impedance (>1 TΩ). Its internal compensation ensures stable unity-gain operation with ≤20 pF capacitive load drive capability.

It features fully differential input stage with common-mode voltage range extending to VCC+, enabling direct sensing of signals near the positive rail - a key requirement in single-supply sensor interfaces and DC-coupled audio stages.

Key Specifications

Pinout & Package

TL081CPG4 is supplied in an 8-pin SOIC (Small Outline Integrated Circuit) package, designated as 'D' in TI's packaging nomenclature. This surface-mount package measures 3.91 mm × 4.9 mm with 1.27 mm pitch, suitable for automated assembly and moderate-power analog PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL081IP and OPA134UA, TL081CPG4 offers the lowest cost-per-channel and optimal balance of speed, noise, and supply flexibility for general-purpose industrial signal conditioning - making it the default choice unless extended temperature or ultra-low-noise requirements dictate otherwise.

Availability

TL081CPG4 is available at Aetrix Electronics and suitable for pro audio mixer design, battery test equipment development, solar inverter monitoring, and AC motor drive feedback applications requiring stable component supply across long production lifecycles.

Supply support for TL081CPG4 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog ICs and broad industrial portfolio coverage.

The TL08x family was engineered as a cost-optimized, high-performance JFET-input op-amp series targeting industrial instrumentation, audio systems, and power electronics where reliability, wide supply range, and rail-sensing capability are essential.

FAQ

What is the maximum operating temperature range for TL081CPG4?

The TL081CPG4 is rated for operation from 0°C to +70°C ambient temperature, consistent with its 'C' grade designation. This makes it suitable for commercial and light-industrial environments but not for extended-temperature applications such as automotive engine compartments or outdoor solar inverters - for those, the TL081I (–40°C to +85°C) or TL081H (–40°C to +125°C) variants should be selected instead. Always verify thermal derating based on PCB layout and power dissipation in your specific TL081CPG4 implementation.

Does TL081CPG4 support single-supply operation?

Yes, TL081CPG4 supports single-supply operation with a common-mode input voltage range that extends to VCC+, allowing inputs to swing up to the positive rail. However, its output cannot swing fully to either rail - typical headroom is 115–210 mV from VCC+ and 105–215 mV from VCC– at RL = 10 kΩ. For true rail-to-rail input/output behavior, consider newer alternatives like the TLV2461 or OPA344. The TL081CPG4 remains viable in single-supply configurations where mid-rail biasing and adequate headroom are acceptable.

What is the input offset voltage specification for TL081CPG4?

The input offset voltage for TL081CPG4 is specified as 3 mV (minimum), 10 mV (maximum) at TA = 25°C with ±15 V supplies. Over the full 0°C to +70°C temperature range, max offset increases to 13 mV. This parameter directly impacts DC accuracy in precision gain stages - for example, in a non-inverting amplifier with G = 100, a 10 mV offset produces a 1 V output error at zero input. Applications demanding sub-mV offset should consider laser-trimmed op-amps like the OPA277 or auto-zero devices such as the LTC1050.

Can TL081CPG4 drive capacitive loads reliably?

TL081CPG4 is characterized to drive up to 300 pF capacitive load while maintaining stability, per its datasheet specification. However, phase margin degrades significantly beyond 20 pF without external compensation - Figure 5-25 shows marginal stability at 100 pF. For driving cables or ADC input capacitance >50 pF, a series resistor (e.g., 100 Ω) between TL081CPG4 output and the load is strongly recommended to isolate the capacitance and preserve transient response. Uncompensated heavy capacitive loading may cause ringing or oscillation in TL081CPG4 circuits.

Is TL081CPG4 pin-compatible with other TL081 variants?

Yes, TL081CPG4 uses the standard 8-pin SOIC (D package) footprint and identical pinout as all TL081x variants including TL081IP, TL081ACP, and TL081H. Pin 1 (NC), 2 (IN–), 3 (IN+), 4 (VCC–), 5 (NC), 6 (OUT), 7 (VCC+), and 8 (NC) are functionally and physically identical across these parts. This allows drop-in replacement for temperature or performance upgrades - for example, substituting TL081CPG4 with TL081IP retains full PCB compatibility while extending operating range to –40°C to +85°C.