Texas Instruments TLC277CP

Overview

TLC277CP from Texas Instruments is a precision dual CMOS operational amplifier optimized for single-supply operation, featuring 500 µV max input offset voltage (25°C), 10.8 nV/√Hz input voltage noise at 1 kHz, and rail-to-rail output swing down to the negative rail. It operates from 3 V to 16 V over 0°C to 70°C and delivers 4.5 MHz unity-gain bandwidth with 0.5 V/µs slew rate - enabling high-fidelity signal conditioning in battery-powered sensor front-ends and industrial analog interfaces.

For engineers reviewing the TLC277CP datasheet, TLC277CP pinout, TLC277CP application, or TLC277CP equivalent, key selection considerations include its low input bias current (<60 pA), wide common-mode input range extending below ground, high CMRR (65–80 dB), and compatibility with TTL/HCMOS logic supply rails - critical when upgrading legacy bipolar op-amp designs or designing low-power, high-impedance measurement circuits.

Technical Context

The TLC277CP uses a polysilicon-gate CMOS process to achieve ultra-high input impedance (>10¹² Ω) and sub-picoampere input bias current, minimizing loading on high-impedance sources like piezoelectric sensors and pH electrodes. Its input stage supports common-mode voltages down to –0.1 V (at VDD = 5 V), enabling true single-supply operation without level-shifting circuitry.

Internally, it integrates ESD protection and latch-up immunity, and its open-loop gain exceeds 5 V/mV with 60° phase margin at unity gain - ensuring stable operation in closed-loop configurations including active filters, transimpedance amplifiers, and precision comparators with hysteresis.

Key Specifications

Pinout & Package

Package: PDIP-8 (Plastic Dual In-line Package), 9.81 mm × 9.43 mm, through-hole mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC277CP, TLV2772CP offers tighter initial offset at slightly higher supply current, while OPA2333PA provides near-zero drift but mandates SOIC-8 re-layout - making TLC277CP the optimal balance of precision, through-hole compatibility, and cost for industrial sensor upgrades.

Availability

TLC277CP is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, portable medical instrumentation, and battery-powered data loggers requiring stable component supply across extended product lifecycles.

Supply support for TLC277CP 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, embedded processing, and connectivity technologies, with decades of heritage in precision op-amp design and manufacturing.

The TLC27xx family was engineered to replace bipolar op-amps in cost-sensitive, low-power, high-input-impedance applications - delivering BiFET-like performance using robust CMOS process technology.

FAQ

What is the maximum supply voltage rating for the TLC277CP?

The TLC277CP has an absolute maximum supply voltage (VDD) of 18 V. Operation beyond this limit risks permanent damage. The recommended operating range is 3 V to 16 V across the 0°C to 70°C temperature range. Exceeding 16 V may degrade long-term reliability even if within absolute ratings, and thermal dissipation must be verified per application load conditions. Always refer to Section 4.1 of the official TLC277CP datasheet for derating curves and safe operating area details.

Does the TLC277CP support true rail-to-rail input operation?

The TLC277CP does not support rail-to-rail input - its common-mode input voltage range extends to –0.1 V below the negative rail (enabling ground-referenced inputs in single-supply use), but the upper limit is VDD – 1 V at 25°C and VDD – 1.5 V over full temperature. However, its output is rail-to-rail: it swings within 50 mV of both supply rails under 10 kΩ load. This makes TLC277CP ideal for output-stage buffering but requires external biasing for inputs near VDD.

Can unused channels of the TLC277CP be left floating?

No - unused amplifiers in the TLC277CP must not be left floating. TI explicitly recommends configuring them as grounded unity-gain followers (non-inverting buffer with output tied to inverting input and non-inverting input tied to GND) to prevent oscillation, phase reversal, or increased supply current. Floating inputs can cause unpredictable biasing, thermal runaway, or EMI susceptibility. This requirement applies to all variants in the TLC27xx family.

What is the typical input offset voltage drift over temperature for the TLC277CP?

The TLC277CP exhibits a typical input offset voltage temperature coefficient of 0.3 µV/°C over the 25°C to 70°C range. This low drift - enabled by polysilicon-gate CMOS process and threshold voltage stabilization - ensures minimal calibration drift in industrial environments. Measured production data shows <1 µV/°C variation across 15,462 units, confirming consistency. For applications requiring tighter drift control, zero-drift alternatives like OPA2333PA offer <0.05 µV/°C but at higher cost and different packaging.

Is the TLC277CP pin-compatible with other devices in the TLC27xx family?

Yes - the TLC277CP is fully pin-compatible with TLC272CP, TLC272ACP, and TLC272BCP in the PDIP-8 package. All share identical pinout, supply requirements, and AC/DC specifications except for input offset voltage grade (500 µV for TLC277CP vs 10 mV for TLC272CP). This allows drop-in replacement for performance upgrades without layout changes. However, it is not pin-compatible with SOIC-8 or TSSOP-8 variants due to differing footprints, nor with newer families like TLV2772.