Texas Instruments TLC274CDRG4

Overview

TLC274CDRG4 from Texas Instruments is a precision quad CMOS operational amplifier optimized for single-supply operation, featuring 10 mV max input offset voltage (C-suffix), 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 low-voltage sensor front-ends and industrial analog interfaces.

For engineers reviewing the TLC274CDRG4 datasheet, TLC274CDRG4 pinout, TLC274CDRG4 application, or TLC274CDRG4 equivalent, key selection considerations include its guaranteed input common-mode range extending below ground, ultra-low input bias current (<60 pA), high CMRR (65–80 dB), and SOIC-14 packaging compatible with automated assembly and space-constrained PCB layouts.

Technical Context

The TLC274CDRG4 uses a polysilicon-gate CMOS process to achieve extremely high input impedance (>10¹² Ω) and low input bias current, minimizing loading on high-impedance sources like piezoelectric sensors and photodiode transimpedance stages. Its input stage supports common-mode voltages as low as –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 4.8–8 mA supply current (depending on VDD and temperature). Its open-loop gain exceeds 5 V/mV, and phase margin is stabilized at 60°, supporting stable unity-gain and moderate closed-loop configurations up to 100 kHz without external compensation.

Key Specifications

Pinout & Package

Package: SOIC-14 (D package), 8.65 mm × 6 mm body size, surface-mount, tape-and-reel compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2464IDR and OPA4188AIDR, the TLC274CDRG4 delivers broader supply voltage compatibility (3–16 V), lower cost, and proven long-term availability - making it the pragmatic choice for non-zero-drift, single-supply precision amplification where 10 mV offset and 10.8 nV/√Hz noise meet system requirements.

Availability

TLC274CDRG4 is available at Aetrix Electronics and suitable for industrial sensor interfaces, medical instrumentation front-ends, and automotive cabin monitoring systems requiring stable component supply across extended product lifecycles.

Supply support for TLC274CDRG4 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-amp design and manufacturing excellence.

The TLC27xx family was engineered for cost-effective, high-input-impedance precision amplification in single-supply systems - targeting industrial automation, test equipment, and sensor signal chains where BiFET performance was previously required.

FAQ

What is the maximum supply voltage rating for the TLC274CDRG4?

The absolute maximum supply voltage for the TLC274CDRG4 is 18 V, but the recommended operating range is 3 V to 16 V across 0°C to 70°C ambient. Exceeding 16 V risks exceeding internal power dissipation limits and may degrade long-term reliability, even if no immediate failure occurs. The TLC274CDRG4 datasheet specifies 16 V as the upper limit for guaranteed parametric performance.

Does the TLC274CDRG4 support true rail-to-rail input operation?

The TLC274CDRG4 does not provide full rail-to-rail input common-mode range - its input common-mode voltage extends to –0.1 V below GND and up to VDD – 1 V at 25°C (or VDD – 1.5 V over full temperature range). While this enables operation with inputs at or slightly below ground, it does not accept signals at the positive rail. The TLC274CDRG4 output, however, swings within 50 mV of both rails under load.

Can unused amplifiers in the TLC274CDRG4 be left unconnected?

No - unused amplifiers in the TLC274CDRG4 must be configured as unity-gain buffers with inputs tied to a valid common-mode voltage (e.g., mid-supply via resistor divider or grounded for single-supply use). Leaving inputs floating or unterminated can cause oscillation, increased supply current, or erratic behavior due to internal node instability. TI explicitly recommends grounding non-inverting inputs and connecting outputs to inverting inputs for shutdown stability.

What is the typical input bias current of the TLC274CDRG4 at 85°C?

At 85°C, the typical input bias current of the TLC274CDRG4 is 200 pA, with a maximum of 2000 pA per input, as specified in Section 4.6 of the datasheet for the I-suffix grade. Although the C-suffix TLC274CDRG4 is rated for 0°C to 70°C operation, its bias current behavior follows the same trend: rising exponentially with temperature due to CMOS gate leakage, necessitating guarded PCB layouts in high-temperature deployments.

Is the TLC274CDRG4 pin-compatible with other SOIC-14 quad op-amps like the LM324?

No - the TLC274CDRG4 is not pin-compatible with the LM324. While both are SOIC-14 quad op-amps, their pinouts differ: the LM324 places VCC at pin 4 and GND at pin 11, whereas the TLC274CDRG4 assigns VDD to pin 4 and GND to pin 11 - same numbering, but internal channel mapping and power pin assignments are identical. However, functional substitution requires verification of offset, noise, bandwidth, and supply range compatibility; direct PCB replacement is not assured without layout review.