Texas Instruments TLC274BCD

Overview

TLC274BCD from Texas Instruments is a precision quad CMOS operational amplifier optimized for single-supply operation, featuring 2 mV max input offset voltage (25°C), 10.8 nV/√Hz input voltage noise at 1 kHz, and rail-to-rail output swing down to GND. It operates from 3 V to 16 V over 0°C to 70°C and delivers 4.5 MHz unity-gain bandwidth - enabling high-fidelity signal conditioning in battery-powered sensor interfaces and industrial analog front-ends.

For engineers reviewing the TLC274BCD datasheet, TLC274BCD pinout, TLC274BCD application, or TLC274BCD equivalent, key selection considerations include its low input bias current (<60 pA), wide common-mode input range extending below ground, and compatibility with TTL/HCMOS supply rails - critical for upgrading legacy designs requiring precision, low-power, single-supply op-amps.

Technical Context

The TLC274BCD 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, the device integrates ESD protection and latch-up immunity, with four independent amplifiers sharing a single 14-pin SOIC package. Each amplifier provides 0.5 V/μs slew rate and >65 dB CMRR, supporting stable closed-loop configurations up to 100 kHz with 10 kΩ loads and 20 pF capacitance.

Key Specifications

Pinout & Package

Package: SOIC-14 (D package), 8.65 mm × 6 mm body size, surface-mount, JEDEC MS-012 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC274CD and TLV2464IDR, the TLC274BCD uniquely balances low offset (2 mV), low noise (10.8 nV/√Hz), and robust industrial temperature rating (0°C–70°C) in a legacy-compatible SOIC-14 footprint - making it optimal for upgrading existing precision analog designs without layout changes.

Availability

TLC274BCD is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable medical devices, automotive cabin monitoring systems, and test equipment requiring stable component supply and long-term manufacturability.

Supply support for TLC274BCD 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 TLC274BCD belongs to TI's TLC27xx precision quad op-amp family, engineered for single-supply, low-noise, high-input-impedance applications in industrial, medical, and test instrumentation where DC accuracy and reliability are critical.

FAQ

What is the maximum input offset voltage specification for TLC274BCD over its full operating temperature range?

The TLC274BCD has a maximum input offset voltage of 3000 µV (3 mV) across the full 0°C to 70°C operating range, as specified in Section 4.3 of the official datasheet. At 25°C, the typical value is 2000 µV, and the maximum remains 3000 µV up to 70°C. This parameter directly impacts DC accuracy in precision gain stages and sensor amplifiers using the TLC274BCD.

Does TLC274BCD support true single-supply operation with inputs below ground?

Yes, the TLC274BCD supports true single-supply operation with common-mode input voltage extending to –0.1 V (at VDD = 5 V, 25°C), as confirmed in Table 4-3. This capability allows direct interfacing with bipolar sensor outputs or level-shifted signals without external clamping diodes or negative bias rails - a key design advantage of the TLC274BCD in cost-constrained systems.

What is the recommended bypass capacitor for TLC274BCD's VDD pin?

Texas Instruments recommends a minimum 0.1 µF ceramic capacitor placed as close as possible to the VDD pin (Pin 4) and GND (Pin 11) of the TLC274BCD. For systems with high-frequency noise or fast-switching loads, adding a parallel 10 µF tantalum or aluminum electrolytic capacitor improves low-frequency decoupling. This configuration ensures stable operation and minimizes supply-induced errors in the TLC274BCD.

Can unused amplifiers in the TLC274BCD be left unconnected?

No - unused amplifiers in the TLC274BCD must be configured as unity-gain buffers with inputs tied to a valid common-mode voltage (e.g., mid-rail or GND) to prevent oscillation or excessive current draw. The datasheet explicitly states that floating inputs can cause instability. For example, connecting 3IN+ and 3IN– together and to GND, then routing 3OUT back to 3IN–, forms a stable grounded follower - a required practice for reliable use of the TLC274BCD.

Is TLC274BCD pin-compatible with other members of the TLC27xx family?

Yes, the TLC274BCD is fully pin-compatible with all TLC27xx quad op-amps in SOIC-14 (D) package, including TLC274CD, TLC274ACD, and TLC279CD. All share identical pin numbering, electrical connections, and mechanical footprint. This allows drop-in replacement during design iteration or qualification - for instance, substituting TLC274BCD for TLC274CD to improve DC accuracy without PCB revision.